I, THE GOVERNOR-GENERAL in and over the Commonwealth of Australia, acting with the advice of the Federal Executive Council, hereby make the following Regulations under the Navigation Act 1912-1956.
Dated this twenty-sixth
day of June , 1959
W.J. Slim
Governor-General.
By His Excellency’s Command,
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Minister of State for Shipping and Transport.
Image unavailable in extracted textNAVIGATION (RADIO) REGULATIONS.
Part I.—Preliminary.
Citation.
These Regulations may be cited as the Navigation (Radio) Regulations.
Repeal.
The Navigation (Wireless Telegraphy) Regulations (comprising Statutory Rules 1935, Nos. 64 and 81; Statutory Rules 1937, No. 92; and Statutory Rules 1942, No. 122) are repealed.
Parts.
These Regulations are divided into Parts, as follows:—
Part I.—Preliminary (Regulations 1-5).
Part II.—General Provisions (Regulations 6-13).
Part III.—Radiotelegraph Ships (Regulations 14-30).
Part IV.—Radiotelegraphy Equipment in or for Lifeboats (Regulations 31-33).
Part V—Radiotelephone Ships (Regulations 34-44).
Part VI.—Transitional Provisions (Regulations 45-57).
Interpretation.
4.—(1.) In these Regulations, unless the contrary intention appears—
“approved” means approved by the Minister, the Postmaster-General or an authorized officer;
“at sea”, in relation to radio watch-keeping, means the period occupied in a voyage between the berth at one port of call and the berth at the next port of call;
Image unavailable in extracted text“authorized officer” means a person who is an authorized officer for the purposes of regulation 26 of the Wireless Telegraphy Regulations;
* Notified in the Commonwealth Gazette on 26 June, 1959.
4324/58.—Price 2s. 3d. 6/28.5.1959.
“auto-alarm” means an apparatus of an approved type for automatically receiving and registering an alarm signal, being apparatus that complies with the requirements specified in the Fifth Schedule;
“Class I. ship” means a passenger ship carrying, or authorized to carry, more than two hundred and fifty passengers;
“Class II. (a) ship” means a passenger ship that is not a Class I. ship;
“Class II. (b) ship” means a cargo ship of not less than one thousand six hundred tons;
“Class III. ship” means a cargo ship of less than one thousand six hundred tons but of not less than seven hundred and fifty tons;
“Class IV. (a) ship” means a cargo ship of less than seven hundred and fifty tons that is not a Class IV. (b) ship;
“Class IV. (b) ship” means a sailing ship equipped with auxiliary power;
“connected” means electrically connected;
“equipment” means equipment forming part of a radio installation;
“existing installation” means—
(a) an installation wholly installed before the commencement of these Regulations; or
(b) an installation part of which was installed before the commencement of these Regulations and the remainder of which consists either of—
(i) parts installed in replacement of identical parts;
or
(ii) parts which comply with the requirements of these Regulations;
“existing ship” means a ship the keel of which was laid before the commencement of these Regulations;
“mile” means nautical mile;
“new installation” means an installation installed on a ship after the commencement of these Regulations and includes an installation which replaces an existing installation;
“new ship” means a ship the keel of which was laid after the commencement of these Regulations;
“operating position”, in relation to any equipment, means the position normally occupied by a person when operating that equipment;
“radio surveyor” means a person, being a person skilled with regard to radio installations, appointed under section 190 of the Act to be a surveyor;
“radiotelegraph room” means a room or rooms exclusively appropriated for the operation of radio equipment;
“radiotelegraph ship” means a ship equipped with a radiotelegraphy installation;
“radiotelephony distress frequency” means the frequency of two thousand one hundred and eighty-two kilocycles per second;
“radiotelephone ship” means a ship equipped with a radiotelephony installation;
“radio watch” means, in the case of a radiotelegraph ship, listening on the frequency of five hundred kilocycles per second and, in the case of a radiotelephone ship, listening on the frequency of two thousand one hundred and eighty-two kilocycles per second;
“ship” means a ship which is—
(a) registered in Australia;
(b) engaged in the coasting trade; or
(c) engaged in the carriage of passengers from a port in Australia to a port outside Australia,
but does not include—
(d) a Safety Convention ship in respect of which there is in force a valid Safety Convention certificate showing that the ship—
(i) complies with such of the requirements of the Safety Convention as relate to radio installations and radio navigational aids; or
(ii) is wholly exempt from those requirements or is partly exempt and complies with those requirements to the extent to which she is not exempt;
(e) a ship trading exclusively between ports not more than twenty-five miles apart;
(f) a ship being towed by another ship where that other ship is provided with a radiotelegraphy or radiotelephony installation that complies with these Regulations;
(g) a river and bay ship; or
(h) a sailing ship not equipped with auxiliary power.
“silence periods” means—
(a) in the case of a radiotelegraph ship—periods of three minutes beginning at the expiration of fifteen minutes and forty-five minutes, respectively, after each hour of each day reckoned according to Greenwich Mean Time; and
(b) in the case of a radiotelephone ship—periods of three minutes beginning at each hour, and at the expiration of thirty minutes after each hour, of each day reckoned according to Greenwich Mean Time;
“the Act” means the Navigation Act 1912-1956;
“the Wireless Telegraphy Regulations” means the Wireless Telegraphy Regulations in force from time to time under the Wireless Telegraphy Act 1905-1950.
(2.) Where a word or phrase used in these Regulations is defined in section 187a of the Act, that word or phrase as so used shall, unless the contrary intention appears, have the meaning given to it in that section.
(3.) In these Regulations—
(a) a reference to the tonnage of a ship shall be read as a reference to the gross registered tonnage of the ship;
(b) a reference to a Schedule shall be read as a reference to a Schedule to these Regulations;
(c) a reference to a wave or signal of type A1 shall be read as a reference to radiotelegraphy by the keying of a continuous wave on and off;
(d) a reference to a wave or signal of type A2 shall be read as a reference to amplitude modulated radiotelegraphy by the keying of a modulating audio-frequency or of an emission continuously modulated by an audio-frequency;
(e) a reference to a wave or signal of type A3 shall be read as a reference to double sideband amplitude modulated radio-telephony; and
(f) a reference to type B waves shall be read as a reference to damped waves.
(4.) Parts II. to V. (inclusive) of these Regulations shall be read and construed subject to Part VI. of these Regulations.
Exemptions.
5.—(1.) The Minister may—
(a) exempt a Class III. ship from all or any of the requirements of Part III. of these Regulations;
(b) exempt a Class IV. (a) ship or a Class IV. (b) ship from all or any of the requirements of Part V. of these Regulations; and
(c) exempt a ship registered in a country to which the Safety Convention does not apply from all or any of the requirements of Division 6a of Part IV. of the Act and of these Regulations.
(2.) Any such exemption may be unconditional or subject to such conditions as the Minister thinks fit.
Part II.—General Provisions.
Provision of radio installation.
6.—(1.) Subject to these Regulations, a Class I. ship, a Class II. (a) ship, a Class II. (b) ship, or a Class III. ship shall be equipped with a radiotelegraphy installation which complies with the requirements specified in the First Schedule.
(2.) Subject to these Regulations, a Class IV. (a) ship or a Class IV. (b) ship shall be equipped with a radiotelephony installation which complies with the requirements specified in the Second Schedule.
(3.) The main and emergency radiotelegraphy transmitters in a Class HI. ship may be combined in a single instrument, if that instrument complies with the requirements of the First Schedule in relation to those transmitters.
Climatic and durability tests.
7.—(1.) Equipment forming part of a radio installation (including equipment required by these Regulations to be provided in, or for use in, lifeboats) shall be such that it is free from mechanical defects and complies with the requirements of these Regulations—
(a) when undergoing the vibration, dry heat and low temperature tests in accordance with the Third Schedule;
(b) when subjected to the damp heat test in accordance with that Schedule; and
(c) immediately after undergoing, in accordance with that Schedule, such other tests specified in that Schedule as are applicable to the equipment.
(2.) Equipment for use in the open, or in an open boat, shall be such that, after undergoing the mould growth test specified in the Third Schedule, mould growth is not present on it.
Interference, &c.
A radio installation with which a ship is equipped shall be installed in such a position and manner, and other electrical apparatus on the ship shall be equipped with such devices, that the effective reception of radio signals by the radio installation is not hindered while the ship is at sea by interference caused by electrical or other apparatus on the ship.
Maintenance of radio installation.
A radio installation with which a ship is equipped shall be maintained so that it is, at all times while the ship is at sea, capable of effectively transmitting and receiving radio signals.
High voltage parts.
10.—(1.) This regulation applies to parts and wiring of equipment which at any time are at an instantaneous voltage (other than radio-frequency voltage) exceeding—
(a) in the case of equipment specified in the Fourth Schedule—fifty volts; or
(b) in the case of other equipment—two hundred and fifty volts.
(2.) Parts and wiring to which this regulation applies shall be protected from accidental access and, except in the case of a generator or converter, shall be isolated automatically from all sources of electrical energy when the means of protection are removed.
(3.) Capacitors in a transmitter shall be capable of being discharged.
Batteries.
11.—(1.) Batteries provided as a source of electrical energy for any equipment shall, as far as practicable, be so placed as to secure the greatest degree of safety and protection.
(2.) Means shall be provided for the charging from the ship’s main source of electrical energy of batteries provided as a source of electrical energy for any equipment.
(3.) In the case of a new installation, if the means of charging the batteries is a rotary converter, an alternative means of charging the batteries shall be provided.
Exemption of certain ships from requirement to keep radio log-book.
A Class IV. (a) ship or a Class IV. (b) ship, not being a ship engaged on an international voyage, is exempted from the requirements of paragraph (a) of section 231e of the Act.
Radio log-book.
13.—(1.) The radio log-book required by section 231e of the Act to be kept shall be in accordance with the form set out in the Sixth Schedule.
(2.) The master of a ship equipped with a radio installation shall—
(a) cause the radio log-book of the ship to be kept in the room or place from which the radio installation is operated; and
(b) upon request by a radio surveyor, cause the radio log-book to be made available for inspection by the radio surveyor.
(3.) The master of a ship equipped with a radio installation and, if the ship carries more than one radio officer as part of her crew, the first radio officer shall inspect and sign the radio log-book once each day.
(4.) On the expiration of the articles of agreement of a ship equipped with a radio installation, the master of the ship shall cause the radio log-book to be delivered to the superintendent at the port at which the articles expire.
Penalty: Fifty pounds.
Part III.—Radiotelegraph Ships.
Electrical independence of main and emergency equipment.
Subject to sub-regulation (3.) of regulation 6 of these Regulations, the main and emergency radiotelegraphy equipment provided on a radiotelegraph ship shall be electrically independent of each other.
Radiotelegraph room.
15.—(1.) A radiotelegraphy installation provided on a new ship that is a Class I. ship, a Class II. (a) ship, a Class II. (b) ship or a Class III. ship shall be installed in a radiotelegraph room.
(2.) The radiotelegraph room shall be situated as high as practicable in the ship.
(3.) A radiotelegraphy installation shall be installed in a position where—
(a) it will be protected against disturbance of its effectiveness by water or by extremes of temperature; and
(b) it will not affect a ship’s compass,
being a position, in the case of a Class III. ship, approved by a radio surveyor.
(4.) A room or place from which a radiotelegraphy installation is operated shall be provided with—
(a) an efficient two-way means of calling and voice communication with the bridge and any other place from which the ship is normally navigated, the method of communication being—
(i) by a voicepipe or a telephone, or by other means which, in the opinion of a radio surveyor, is equally efficient; and
(ii) independent of the main communication system of the ship and of the ship’s main source of electrical energy;
(b) a reliable clock, equipped with a dial not less than five inches in diameter and a centre second-hand, securely mounted in such a position that the entire dial can be easily and accurately observed from the operating position and, if the ship is provided with an auto-alarm, from the position normally occupied by a person testing the auto-alarm;
(c) an electric lamp—
(i) operated from the source of electrical energy required by sub-regulation (5.) of regulation 18 of these Regulations;
(ii) permanently arranged so as to be capable of providing adequate illumination of the operating controls of the main and emergency radiotelegraphy installations and of the clock referred to in the last preceding paragraph; and
(iii) controlled by two-way switches placed respectively near the entrance to the room or place from which the installation is operated and at the operating position;
(d) an additional electric lamp, for use as an inspection lamp, operated from the source of energy referred to in the last preceding paragraph, and provided with a flexible lead of sufficient length to enable all parts of the radiotelegraphy installation to be illuminated; and
(e) a chair capable of being fixed at the operating position.
(5.) A complete list of equipment and spare parts carried on board a ship for the maintenance of the radiotelegraphy installation, being a list indicating where the equipment and spare parts are kept, shall be provided in each room or place on the ship from which the installation is operated.
(6.) A calibration table or calibration curve for each transmitter and receiver forming part of the radiotelegraphy installation on a ship shall, unless the transmitter or receiver, as the case may be, is directly calibrated, be provided in each room or place on the ship from which the installation is operated.
(7.) In the case of a new installation, a complete diagram of the installation as wired shall be provided in each room or place from which the installation is operated.
Aerials.
16.—(1.) Subject to the next succeeding sub-regulation, a radiotelegraph ship shall be fitted with a main aerial and an emergency aerial, each of which shall be properly erected.
(2.) The Minister may exempt a ship from the requirement that it be fitted with an emergency aerial if he is satisfied that the fitting of such an aerial is, in all the circumstances, impracticable or unreasonable.
(3.) A ship exempted under the last preceding sub-regulation shall carry a spare aerial completely assembled for immediate erection.
(4.) Except in the case of a Class III. ship, each of the halyards used for supporting the main aerial shall be fitted with a safety loop between the masthead or other aerial support and an aerial insulator.
(5.) The safety loop shall consist of a part of the halyard, not less than three feet in length, the loop being closed by a link not more than one foot three inches in length with a breaking load not exceeding one-third of the breaking load of the aerial or the halyard, whichever is the less.
(6.) The lead-in insulators for the main and emergency aerials through which the transmitters are connected to the base of the aerials shall be protected against the effects of sea spray by the use of metallic tubes or shields.
(7.) A rigging plan of the aerials, showing—
(a) elevation and plan views of the aerials;
(b) the measurements of the aerials in feet and inches; and
(c) the height of the aerials in metres measured in the manner specified in sub-regulation (3.) of the next succeeding regulation,
shall be provided in the room or place from which the radiotelegraphy installation is operated.
(8.) The main aerial and the emergency aerial (if any) shall, where practicable, be so rigged that damage to one will not affect the efficiency of the other.
(9.) The main aerial and the emergency aerial (if any) shall each be capable of being connected, as circumstances require, to—
(a) the main transmitter;
(b) the main receiver;
(c) the emergency transmitter;
(d) the emergency receiver; and
(e) the auto alarm.
Range of transmitters.
17.—(1.) The normal ranges of the radiotelegraphy transmitters provided in accordance with these regulations shall be—
(a) in the case of a Class I. ship, a Class II. (a) ship or a Class II. (b) ship—not less than one hundred and fifty miles for the main transmitter and not less than one hundred miles for the emergency transmitter; and
(b) in the case of a Class III. ship—not less than one hundred miles for the main transmitter and not less than seventy-five miles for the emergency transmitter.
(2.) The range of a transmitter for the purposes of these Regulations shall be determined either by reckoning or by test, at the option of the owner of the ship.
(3.) The normal range of a radiotelegraphy transmitter determined by reckoning shall be ascertained—
(a) by calculating the product of the root mean square current in amperes at the base of the main aerial and the maximum height in metres of the aerial measured from the load line mark indicating the greatest depth to which the ship may at any time or place be submerged in accordance with the Navigation (Load Line) Regulations or, if there is no such mark on the ship, from the mean level of the surface of the water in which the ship is afloat; and
(b) determining the range, having regard to that product, in accordance with the following table:—
Product.
Range in Miles.
Not less than 76..........................
Not less than 150
Less than 76 but not less than 45...............
Less than 150 but not less than 100
Less than 45 but not less than 34...............
Less than 100 but not less than 75
Less than 34 but not less than 10...............
Less than 75 but not less than 25
(4.) For the purposes of the last preceding sub-regulation, transmission shall be conducted on the frequency of five hundred kilocycles per second using signals of type A2 or type B, as the case requires.
(5.) The normal range of a radiotelegraphy transmitter determined by test is the distance to which signals of type A2 or type B can be transmitted by the transmitter over the sea by day under normal conditions on the
frequency of five hundred kilocycles per second so as to set up at the receiver a total root mean square field strength of not less than fifty microvolts per metre.
Supply of electrical energy.
18.—(1.) Subject to this regulation, there shall be available in a radiotelegraph ship a supply of electrical energy from the ship’s main source of electrical energy sufficient for the operation of the main radiotelegraphy equipment in accordance with these Regulations and for charging batteries that are a source of electrical energy for the radiotelegraphy installation.
(2.) The rated voltage of the supply of electrical energy for the main equipment shall be maintained within a tolerance of plus or minus ten per centum.
(3.) The supply of electrical energy shall, if it is a direct current supply, be of correct polarity.
(4.) In a Class III. ship, not engaged on an international voyage, the supply of electrical energy may be derived from a battery or a set of batteries but, except in the case of a single battery on float charge where provision is made to the satisfaction of a radio surveyor to protect the equipment from the application of excessive voltage, a duplicate battery or set of batteries shall also be provided.
(5.) The emergency equipment shall include a source of electrical energy that is independent of the propelling power of the ship and of the rest of the ship’s electrical installation and is capable of being brought into immediate operation by means of a switchboard situated in, or readily accessible from, the room or place from which the radiotelegraphy installation is operated.
(6.) A source of electrical energy provided in a ship in compliance with the last preceding sub-regulation shall be of such capacity, and shall be so maintained at all times when the ship is at sea, as to be capable of supplying continuously for a period of six hours (whether or not it is in use for any other purpose) a total current equal to the sum of—
(a) the current required to operate the emergency transmitter with the key up;
(b) three-fifths of the difference between the current required to operate the emergency transmitter with the key down and the current required to operate it with the key up;
(c) the current required to operate the emergency receiver; and (d) the current consumed by the electric lamp referred to in paragraph (c) of sub-regulation (4.) of regulation 15 of these Regulations.
Emergency source of electrical energy not to be used except for certain purposes.
The master of a radiotelegraph ship shall not use the Source of electrical energy provided on the ship under sub-regulation (5.) of the last preceding regulation, or permit it to be used, except for the operation, in an emergency, of a transmitter or receiver or except for the operation of—
(a) the lamps referred to in paragraphs (c) and (d) of sub-regulation (4.) of regulation 15 of these Regulations;
(b) the automatic keying device;
(c) an auto-alarm; or
(d) a direction finder.
Penalty: One hundred pounds.
Supply of electrical energy for testing.
The master of a radiotelegraph ship shall cause a sufficient supply of electrical energy for testing the radiotelegraphy installation on the ship to be available at all reasonable times while the ship is in port.
Penalty: One hundred pounds.
Documents to be carried on radiotelegraph ships.
21.—(1.) There shall be carried on board a radiotelegraph ship engaged on an international voyage—
(a) the ship’s radio log-book;
(b) a copy of the latest editions of each of the following documents published by the International Telecommunication Union, Geneva:—
(i) Alphabetical List of Call Signs;
(ii) List of Coast and Ship Stations;
(iii) List of Radiolocation Stations;
(iv) List of Special Service Stations;
(v) Radio Regulations and Additional Radio Regulations annexed to the current International Telecommunication Convention;
(c) a copy of the latest edition of the Handbook for Wireless Operators published by Her Majesty’s Stationery Office, London; and
(d) a copy of these Regulations.
(2.) There shall be carried on board a radiotelegraph ship not engaged on an international voyage—
(a) the ship’s radio log-book;
(b) a copy of the latest edition of the List of Coast and Ship Stations published by the International Telecommunication Union, Geneva;
(c) a copy of the latest edition of the Handbook for Wireless Operators published by Her Majesty’s Stationery Office, London; and
(d) a copy of these Regulations.
Radio officers.
22.—(1.) A radiotelegraph ship, not being a ship equipped with an auto-alarm, shall carry, as part of her crew—
(a) in the case of a Class I. ship—three radio officers;
(b) in the case of a Class II. (a) ship or a Class II. (b) ship— two radio officers if the ship is to be at sea for not more than forty-eight hours between consecutive ports, and three radio officers if the ship is to be at sea for more than forty-eight hours between consecutive ports; and
(c) in the case of a Class III. ship—one radio officer.
(2.) A radiotelegraph ship equipped with an auto-alarm shall carry, as part of her crew—
(a) in the case of a Class I. ship engaged on an international voyage—two radio officers;
(b) in the case of a Class I. ship not engaged on an international voyage—one radio officer; and
(c) in the case of a Class II. (a) ship, a Class II. (b) ship or a Class III. ship—one radio officer.
(3.) At least one radio officer carried as part of the crew of a ship registered in Australia or engaged in the coasting trade shall be a person who has had experience at sea in the operation of radiotelegraphy installations for a total of not less than—
(a) two years in the case of a Class I. ship;
(b) one year in the case of a Class II. (a) ship; and
(c) three months in the case of a Class II. (b) ship,
and, in the case of a passenger ship so registered or so engaged, at least one radio officer on board the ship shall be the holder of a valid First Class Commercial Operator’s Certificate of Proficiency in wireless telegraphy under the Wireless Telegraphy Regulations or a certificate referred to in paragraph (b) of sub-regulation (1.) of the next succeeding regulation that is the equivalent of such a certificate.
(4.) For the purposes of this regulation, a ship equipped with an auto-alarm that is not operating effectively shall be deemed not to be equipped with an auto-alarm.
Qualifications of radio officers.
23.—(1.) Subject to this regulation, a person is not qualified to be a radio officer on a ship registered in Australia or engaged in the coasting trade unless he holds—
(a) a valid First or Second Class Commercial Operator’s Certificate of Proficiency in wireless telegraphy under the Wireless Telegraphy Regulations; or
(b) a valid certificate issued by an authority empowered in that behalf by or under a law of a Commonwealth country, being a certificate included in a class of certificates declared in writing by the Postmaster-General, or by an officer authorized by the Postmaster-General to make declarations under this regulation, to be the equivalent of either class of certificate referred to in the last preceding paragraph.
(2.) For the purposes of the last preceding sub-regulation, if—
(a) at the date of his intended engagement, the periods of experience at sea in the operation of radio installations of the holder of a certificate referred to in that sub-regulation during the period of two years immediately preceding that date do not amount in the aggregate to three months; and
(b) the certificate was granted more than two years before that date,
the certificate shall be deemed not to be valid unless the holder satisfies the Postmaster-General, by re-examination or otherwise, that he still possesses the qualifications described in the certificate.
(3.) A person employed as a radio officer on a ship registered in Australia or engaged in the coasting trade shall, upon the request of a radio surveyor, produce his certificate of proficiency for inspection.
Penalty: Fifty pounds.
(4.) For the purposes of these Regulations, a person is not qualified to be a radio officer on a ship not registered in Australia or engaged in the coasting trade unless he holds a valid certificate of proficiency or competence in wireless telegraphy granted by an authority empowered or recognized in that behalf by the law of the country in which the ship is registered.
(5.) A radio officer whose certificate of proficiency is suspended by the Postmaster-General under the Wireless Telegraphy Regulations shall be deemed not to be the holder of a valid certificate of proficiency during the period of the suspension.
Radio watch.
24.—(1.) Subject to the next succeeding regulation, radio watch shall be maintained on a radiotelegraph ship by a radio officer, while the ship is at sea, as follows:—
(a) if the ship is not equipped with an auto-alarm—
(i) in the case of a Class I. ship, a Class II. (a) ship or a Class II. (b) ship—a continuous watch; and
(ii) in the case of a Class III. ship—a watch of eight hours on each day during the times specified in the third column of the Seventh Schedule opposite to the reference in the first column of that Schedule to the waters in which the ship then is; and
(b) if the ship is equipped with an auto-alarm—
(i) in the case of a Class I. ship engaged on an international voyage—a watch of sixteen hours on each day at the times specified in the second column of the Seventh Schedule opposite to the reference in the first column of that Schedule to the waters in which the ship then is; and
(ii) in the case of a Class I. ship not engaged on an international voyage or a Class II. (a) ship, a Class 11. (b) ship or a Class III. ship—a watch of eight hours on each day at the times specified in the third column of the Seventh Schedule opposite to the reference in the first column of that Schedule to the waters in which the ship then is.
(2.) An auto-alarm provided on board a radiotelegraph ship shall be kept in operation at all times at which a manual radio watch is not maintained unless—
(a) the auto-alarm has broken down since the ship last put to sea; and
(b) it is impracticable to repair it at sea so as to operate effectively.
Manner of keeping radio watch.
25.—(1.) Subject to the next succeeding sub-regulation, radio watch shall be maintained on a radiotelegraph ship by a radio officer, by means of headphone reception, in the room or place from which the radiotelegraph installation is operated.
(2.) Radio watch may be maintained by means of loudspeaker reception (or, if that is impracticable, may be dispensed with, except during the silence periods) for such periods as may be necessary to enable the radio officer on duty to perform other duties in compliance with these Regulations or to engage in communication on other frequencies in connexion with the business of the ship.
Tests.
26.—(1.) A radio officer on a radiotelegraph ship equipped with an auto-alarm shall, when radio watch ceases to be maintained during or at the end of his period of duty, connect the auto-alarm with the ship’s main aerial, or, if that aerial is unserviceable and the ship is fitted with an emergency aerial, with the emergency aerial, and shall put the auto-alarm into operation.
(2.) A radio officer who, under the last preceding sub-regulation, is required to put an auto-alarm in operation shall before going off duty—
(a) test the efficiency of the auto-alarm; and
(b) immediately report the result of the test to the master of the ship or to the officer in charge of the navigation of the ship at that time.
(3.) A radio officer shall, if an auto-alarm is connected to an aerial when he goes on duty, immediately test the efficiency of the auto-alarm before making any adjustment to it.
(4.) While a radiotelegraph ship is at sea, the radio officer or, if the ship carries, as part of her crew, more than one radio officer, the first radio officer shall—
(a) where an emergency transmitter of the valve type is employed, test it at least once on each day connected with an artificial aerial that complies with the requirements specified in paragraph 47 of the First Schedule;
(b) if the ship carries an emergency aerial, test the emergency radiotelegraphy transmitter connected with that aerial at least once during each voyage;
(c) test, at least once on each day by voltmeter and once during each month by hydrometer, batteries that are a source of energy for the radiotelegraphy installation, the batteries being placed on normal load during voltage tests;
(d) test any other sources of electrical energy provided for the emergency radiotelegraphy equipment at least once on each day; and
(e) test the audible alarm circuits and the bells forming part of the auto-alarm installation at least once on each day.
Penalty: Fifty pounds.
Charging of batteries.
All batteries which are a source of electrical energy for any part of the radiotelegraphy installation and are found not to be fully charged shall be fully charged as soon as practicable.
Restriction of use of emergency transmitter.
28.—(1.) Subject to the next succeeding sub-regulation, the transmitter forming part of the emergency radiotelegraphy equipment on a ship shall not be used to transmit messages other than urgent messages relating to preservation of life at sea, unless the transmitter complies with the requirements specified in paragraphs 2 to 16 of the First Schedule.
(2.) The last preceding sub-regulation does not apply if the main transmitter has broken down and cannot be repaired while the ship is at sea.
Entries in radio log-book.
29.—(1.) The following entries shall be made in the radio log-book of a radiotelegraph ship:—
(a) the name of each radio officer who goes on duty and the times at which he goes on and off duty;
(b) the identifying number of each message transmitted or received, together with the time and date of its transmission or reception, the station to which each message is transmitted and the station from which each message is received; and
(c) details of incidents occurring which relate to the radiotelegraphy installation or the operation of that installation and which appear to the radio officer on duty to be of importance to the safety of life at sea and, in particular—
(i) the full text of all messages transmitted or received which relate to immediate assistance required by persons in distress at sea or above the sea;
(ii) the full text of all messages transmitted or received which are preceded by a signal in general international use as an urgency signal or a safety signal;
(iii) a record of the radio watch maintained during each of the silence periods;
(iv) a record of the occurrence of any incident which affects the efficiency of the radiotelegraphy installation;
(v) a record of the tests conducted in accordance with sub-regulations (2.), (3.) and (4.) of regulation 26 of these Regulations, and of the results of those tests;
(vi) a record of the charging of batteries used as a source of energy for the radiotelegraphy installation; and
(vii) if the ship is equipped with an auto-alarm, details of any failure or repair of the auto-alarm.
(2.) An entry shall be made in the radio log-book of a radiotelegraph ship at least once each day recording the time shown by the clock in each room or place from which the radiotelegraphy installation is operated in comparison with Greenwich Mean Time, and any correction made in respect of that clock.
Posting of ship’s position.
The master of a radiotelegraph ship shall cause the position, and the true course and speed, of the ship to be posted every four hours in the room or place from which the radiotelegraphy installation is operated.
Penalty: Fifty pounds.
Part IV.—Radiotelegraphy Equipment in or for Lifeboats.
Specifications for fixed installation.
31.—(1.) The radiotelegraphy installation required by the Navigation (Life-saving Appliances) Regulations to be fitted in a lifeboat shall comply with the requirements of Part I. of the Fourth Schedule.
(2.) The master of the ship on which the lifeboat is carried shall not use the battery included in the radiotelegraphy installation of the lifeboat, or permit it to be used, except for the operation of the installation or of the searchlight provided on the lifeboat.
Penalty: Fifty pounds.
Portable equipment.
Portable radiotelegraphy equipment required by the Navigation (Life-saving Appliances) Regulations to be carried in a ship for use in a lifeboat in the event of an emergency shall comply with the requirements of Part II. of the Fourth Schedule.
Tests.
33.—(1.) When a ship is provided with a lifeboat equipped with a radiotelegraphy installation in compliance with the Navigation (Life-saving Appliances) Regulations or portable radiotelegraphy equipment is carried on the ship in compliance with those Regulations, the radio officer, or if the ship carries, as part of her crew, more than one radio officer, the first radio officer or, if the ship does not carry a radio officer as part of her crew, the wireless signaller, shall, at intervals not exceeding seven days while the ship is at sea—
(a) cause the transmitter forming part of the installation or equipment to be tested with its artificial aerial; and
(b) cause any batteries, other than self-priming batteries, which are a source of electrical energy for the installation or equipment to be tested by voltmeter, with the batteries on normal load, and by hydrometer and, if found not to be fully-charged, to be fully charged as soon as practicable.
Penalty: Fifty pounds.
(2.) The results of the tests referred to in the last preceding sub-regulation shall be entered in the radio log-book or, in the case of a Class IV. (a) ship or a Class IV. (b) ship, in the official log-book of the ship.
Part V.—Radiotelephone Ships.
Aerial.
34.—(1.) A radiotelephone ship shall be fitted with a properly erected aerial and, in addition, shall carry a spare aerial completely assembled for immediate erection.
(2.) A rigging plan of the fitted aerial showing—
(a) elevation and plan views of the aerial;
(b) the measurements of the aerial in feet and inches; and
(c) the maximum height of the aerial in metres measured from the lead-out insulator,
shall be provided and kept in an accessible place on the ship.
Range.
35.—(1.) The normal range of the radiotelephony transmitter provided in accordance with these Regulations shall be not less than one hundred and fifty miles.
(2.) The range of a radiotelephony transmitter for the purposes of these Regulations shall be determined either by reckoning or by test, at the option of the owner of the ship.
(3.) The normal range of a radiotelephony transmitter determined by reckoning shall be ascertained by calculating the product of the root mean square current in amperes at the base of the aerial on the radiotelephony distress frequency and the maximum height in metres of the aerial measured from the lead-out insulator.
(4.) The transmitter shall be deemed to comply with the requirements of this regulation if the product so ascertained is not less than—
(a) 7.5 metre-amperes, where the aerial has a horizontal top-length of not less than one-half of its maximum height measured from the lead-out insulator; or
(b) 12.8 metre-amperes in any other case.
(5.) The normal range of a radiotelephony transmitter when determined by test is the distance to which signals can be transmitted over the sea by day under normal conditions on the radiotelephony distress frequency so as to set up at the receiver, by the unmodulated carrier, a total root mean square field strength of not less than twenty-five microvolts per metre.
Supply of electrical energy.
36.—(1.) There shall be available in a radiotelephone ship a supply of electrical energy sufficient to operate the radiotelephony installation in accordance with these Regulations.
(2.) The supply of electrical energy shall, if it is a direct current supply, be of correct polarity.
(3.) The supply of electrical energy may be derived from a battery or a set of batteries, but except in the case of a single battery on float charge where provision is made to the satisfaction of a radio surveyor to protect the equipment from the application of excessive voltage, a duplicate battery or set of batteries shall also be provided.
(4.) The source of electrical energy provided in a ship in compliance with this regulation shall be of such capacity, and shall be so maintained at all times when the ship is at sea, as to be able to supply continuously for a period of six hours a total current equal to the sum of—
(a) one-half of the current required to operate the radiotelephony transmitter for the transmission of speech;
(b) the current required to operate the radiotelephony receiver; and
(c) the current consumed by the electric lamp referred to in paragraph (d) of regulation 39 of these Regulations.
(5.) When the batteries for the radiotelephony transmitter are not in use, each battery shall be capable of being fully charged within a period of not more than sixteen hours by the means of charging referred to in regulation 11 of these Regulations.
Supply of electrical energy for testing.
The master of a radiotelephone ship shall cause a sufficient supply of electrical energy for testing the radiotelephony installation on the ship to be available at all reasonable times while the ship is in port.
Penalty: One hundred pounds.
Documents to be carried on radiotelephone ships.
38.—(1.) There shall be carried on board a radiotelephone ship engaged on an international voyage—
(a) the ship’s radio log-book;
(b) a copy of the latest edition of the List of Coast Stations and Ship Stations published by the International Telecommunication Union, Geneva;
(c) a copy of the latest edition of the Handbook for Wireless Operators published by Her Majesty’s Stationery Office, London; and
(d) a copy of these Regulations.
(2.) There shall be carried on board a radiotelephone ship not engaged on an international voyage the documents specified in paragraphs (b), (c) and (d) of the last preceding sub-regulation.
Miscellaneous requirements.
Where a ship is fitted with a radiotelephony installation—
(a) the installation shall be installed in as high a position as is practicable and in such a place that it will not affect a ship’s compass, being a position and place approved by a radio surveyor;
(b) an efficient two-way means of communication shall be provided between the place of installation and the place from which the ship is normally navigated;
(c) a reliable clock shall be securely mounted within the view of a person at the operating position of the installation;
(d) an electric lamp shall be provided and shall—
(i) be operated from the source of electrical energy referred to in regulation 36 of these Regulations;
(ii) be permanently arranged so as to be capable of providing adequate illumination of the operating controls of the installation and the clock referred to in the last preceding paragraph; and
(iii) be controlled by two-way switches placed respectively near an entrance to the room in which the installation is situated and at the operating position of the installation; and
(e) if the radiotelephone installation is not installed in the place from which the ship is normally navigated, there shall be provided at the loudspeaker referred to in regulation 41 of these Regulations a manual gain control which, when adjusted to the minimum position, permits an output from the loudspeaker of sufficient volume for the maintenance of an effective listening watch.
Provision of radiotelephone operators and qualifications of wireless signallers.
40.—(1.) A radiotelephone ship shall carry, as part of her crew, at least one wireless signaller or radio officer.
(2.) For the purposes of these Regulations, a person is not qualified to be a wireless signaller on a ship registered in Australia or engaged in the coasting trade unless he holds a valid Third Class Commercial Operator’s Certificate of Proficiency in wireless telegraphy and in wireless telephony under the Wireless Telegraphy Regulations.
(3.) For the purposes of the last preceding sub-regulation, if—
(a) at the date of his intended engagement, the periods of experience at sea in the operation of radio installations of the holder of a certificate referred to in that sub-regulation during the period of two years immediately preceding that date do not amount in the aggregate to three months; and
(b) the certificate was granted more than two years before that date, the certificate shall be deemed not to be valid unless the holder satisfies the Postmaster-General, by re-examination or otherwise, that he still possesses the qualifications described in the certificate.
(4.) A person employed as a wireless signaller on a ship registered in Australia or engaged in the coasting trade shall, upon the request of a radio surveyor, produce his certificate of proficiency for inspection.
Penalty: Fifty pounds.
(5.) A wireless signaller whose certificate of proficiency is suspended by the Postmaster-General under the Wireless Telegraphy Regulations shall be deemed not to be the holder of a valid certificate of proficiency during the period of the suspension.
Radio watch by radio telephone.
41.—(1.) Radio watch shall be maintained on a radiotelephone ship, on each day while the ship is at sea, by a radio officer or wireless signaller, for periods of not less than ten minutes commencing at ten o’clock in the forenoon and two o’clock, six o’clock and ten o’clock in the afternoon, reckoned according to standard time in the Australian Capital Territory.
(2.) At all times while a radiotelephone ship is at sea, and a radio watch is not being maintained by a radio officer or wireless signaller or the radiotelephone installation is not being used in connexion with the business of the ship, a radio watch shall be maintained by means of loudspeaker reception at the place from which the ship is navigated.
Tests.
42.—(1.) While a radiotelephone ship is at sea, the radio officer or if the ship does not carry a radio officer as part of her crew, the wireless signaller, shall test batteries which are a source of electrical energy for the radiotelephony installation by voltmeter at least once each week and by hydrometer at least once each month, the batteries being placed on normal load during voltage tests.
(2.) The radio officer or wireless signaller, as the case may be, shall test the radiotelephony installation once during the passage of the ship between each port at which the ship calls by communicating with a coast station.
Penalty: Fifty pounds.
Charging of batteries.
Batteries, being a source of electrical energy for any part of the radiotelephony installation, which are found not to be fully charged shall be fully charged as soon as practicable.
Entries to be made in official log-book.
There shall be entered in the official log-book of a radiotelephone ship—
(a) particulars of the test referred to in sub-regulation (2.) of regulation 42 of these Regulations; and
(b) particulars of all distress messages transmitted or received.
Part VI.—Transitional Provisions.
Application of requirements of First and Second Schedules.
45.—(1.) Subject to regulations 46, 47 and 48 of these Regulations, these Regulations do not require a ship equipped with radiotelegraphy equipment installed before the first day of July, 1960, to be equipped with a radiotelegraphy installation which complies with the requirements specified in the First Schedule, or a radiotelephony installation which complies with the requirements specified in the Second Schedule, as the case may be, if the radiotelegraphy equipment with which the ship is equipped—
(a) complies with such of the requirements of section 231 of the Navigation Act 1912-1952, and of the Navigation (Wireless Telegraphy) Regulations as in force immediately before the commencement of these Regulations, as would have been applicable to it if that section and those Regulations had continued in force; and
(b) complies, in the case of equipment specified in the first column of the following table, from and including the first day of July, 1960, with the requirements specified in the second column of that table opposite to that equipment:—
First Column.
Second Column.
Equipment.
Requirements.
1. Main transmitter and main receiver
The main transmitter and main receiver shall together be capable of changing automatically from transmission to reception in the intervals between the Morse signals of any transmission
2. Main transmitter
The main transmitter shall be capable of maintaining throughout every transmission a frequency tolerance not exceeding plus or minus 0.1 per centum
Emergency transmitter.
These Regulations do not require a ship to be equipped with an emergency transmitter capable of transmitting type A2 waves before the first day of January, 1962.
Receiver.
These Regulations do not require a Class II. (b) ship, a Class III. ship, a Class IV. (a) ship or a Class IV. (b) ship not engaged on an international voyage, being a ship equipped with an existing installation, to be equipped with a receiver capable of reception of waves of type A1 or of covering frequencies above 1,580 kilocycles per second before the first day of July, 1960.
Automatic keying device.
These Regulations do not require a radiotelegraph ship not engaged on an international voyage to be equipped with an automatic keying device before the first day of January, 1962.
Application of regulation 7 to existing installations, &c.
Regulation 7 of these Regulations does not apply to or in relation to—
(a) equipment which is part of an existing installation; or
(b) equipment, being equipment referred to in regulation 45 of these Regulations, which is installed before the first day of July 1960.
Application of regulation 10 to existing installations.
Sub-regulation (2.) of regulation 10 of these Regulations does not apply in relation to an existing installation.
Application of regulation 14 to existing radiotelegraphy installations.
Regulation 14 of these Regulations does not require the main and emergency equipment forming part of a radiotelegraphy installation, being an existing installation, on a Class II. (b) ship to be electrically independent of each other before the first day of July, 1960.
Application of regulation 15 before 1st July, 1960.
52.—(1.) Paragraph (c) of sub-regulation (4.) of regulation 15 of these Regulations does not require the electric lamp referred to in that paragraph to be controlled by two-way switches before the first day of July, 1960.
(2.) Paragraph (d) of sub-regulation (4.) of regulation 15 of these Regulations does not require the additional electric lamp referred to in that paragraph to be provided before the first day of July, 1960.
Application of provisions relating to auto-alarms.
53.—(1.) Where an auto-alarm forming part of an existing installation on a ship—
(a) complies with such of the requirements of section 231 of the Navigation Act 1912-1952, and of the Navigation (Wireless Telegraphy) Regulations as in force immediately before the commencement of these Regulations, as would have been applicable to it if that section and those Regulations had continued in force; and
(b) on and after the first day of July, 1960, complies with the next succeeding sub-regulation,
regulation 7 of these Regulations does not apply to that auto-alarm and the ship shall, for the purposes of regulations 22 and 24 of these Regulations, be deemed to be equipped with an auto-alarm.
(2.) The radiation from the auto-alarm receiver shall not exceed 0.1 microvolt per metre when measured at a distance of one mile from the auto-alarm, or when tested in the manner specified in sub-paragraph (2.) of paragraph 15 of the Fifth Schedule.
Application of regulation 16.
Sub-regulations (4.) and (5.) of regulation 16 of these Regulations do not require halyards used for supporting the main aerial on Class I. ships, Class II. (a) ships or Class II. (b) ships, being ships not engaged on international voyages, to be fitted with safety loops before the first day of July, 1960.
Portable radiotelegraphy equipment for lifeboats.
Portable radiotelegraphy equipment for lifeboats provided in a ship, before the commencement of these Regulations shall, until the first day of January, 1963, be deemed to comply with the requirements specified in paragraphs 31 to 47 of the Fourth Schedule if the ship complies with the requirements of regulation 9a of the Navigation (Wireless Telegraphy) Regulations as in force immediately before the commencement of these Regulations.
Emergency receivers.
Nothing in these Regulations shall be deemed to require an installation on a ship not engaged on international voyages to include an emergency receiver before the first day of January, 1961.
Emergency aerial.
Nothing in these Regulations shall be deemed to require a ship not engaged on international voyages to be fitted with an emergency aerial before the first day of. July, 1960.
Image unavailable in extracted textImage unavailable in extracted textImage unavailable in extracted textTHE SCHEDULES.
First Schedule. Regulation 6
RADIOTELEGRAPHY INSTALLATIONS.
Components.
1. A radiotelegraphy installation shall include—
(a) a main transmitter;
(b) a main receiver;
(c) an emergency transmitter;
(d) an emergency receiver; and
(e) an automatic keying device.
Main Transmitter.
Operation.
2.—(1.) Subject to the next succeeding sub-paragraph, the main transmitter shall be capable of being operated from the supply of electrical energy referred to in sub-regulation (1.) of regulation 18 of these Regulations and of being connected without delay to the main and emergency aerials referred to in regulation 16 of these Regulations.
(2.) The valve filaments in the main transmitter may, if approved in a particular case, be energized from batteries, not being batteries forming part of the emergency equipment referred to in sub-regulation (5.) of regulation 18 of these Regulations.
Types of Waves.
3. The main transmitter shall be capable of adjustment for the transmission of both type A1 and type A2 waves in the frequency range 405 kilocycles per second to 525 kilocycles per second.
Transmitting Frequencies.
4. The main transmitter shall be capable of transmitting continuously, but not simultaneously, radiotelegraphy signals on the frequencies of 500 kilocycles per second, 410 kilocycles per second, 425 kilocycles per second and 512 kilocycles per second.
First Schedule—continued.
Range of Load Impedance.
5. The main transmitter shall be capable of complying with all the requirements of this Schedule applicable to it when connected to an artificial load, one side of which is earthed, consisting of a resistance in series with a capacitance in each of the following combinations:—
(a) a resistance of 3.6 ohms in series with a capacitance of 300 picofarads;
(b) a resistance of 2.8 ohms in series with a capacitance of 400 picofarads;
(c) a resistance of 2.2 ohms in series with a capacitance of 500 picofarads;
(d) a resistance of 2.0 ohms in series with a capacitance of 600 picofarads; and
(e) a resistance of 1.9 ohms in series with a capacitance of 750 picofarads.
Power of Main Transmitter.
6.—(1.) In this paragraph, a reference to the power of the main transmitter Is a reference to the total power developed in the artificial load referred to in the last preceding paragraph during a period when the transmitting key is depressed.
(2.) The maximum power of the main transmitter shall not, at any frequency within its range, be less than the prescribed number of watts.
(3.) For the purposes of the last preceding sub-paragraph, the prescribed number of watts is the number calculated in accordance with the formula—
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where f is the frequency in kilocycles per second at which the test is made.
(4.) The main transmitter shall be so designed that its power can be reduced, either continuously or in steps of not more than 6 decibels, to not less than 2 watts and not more than 9 watts.
(5.) The main transmitter shall, when adjusted to develop its maximum rated power, be capable of—
(a) continuous operation for the transmission of radiotelegraphy signals at any speed up to 30 bauds; and
(b) operation under steady marking or spacing conditions for a period of not less than 15 minutes.
Depth of Modulation.
7. When the main transmitter is transmitting type A2 waves, the depth of modulation shall be—
(a) when the power of the main transmitter is not less than 25 watts—not less than 80 per centum and not more than 95 per centum; and
(b) when the power of the main transmitter is less than 25 watts—not less than 70 per centum and not more than 95 per centum.
Note Frequency.
8. The note frequency of the main transmitter shall not be less than 500 cycles per second or more than 1,200 cycles per second.
Speed of Transmission.
9. The main transmitter shall be capable of transmitting radiotelegraphy signals at all speeds up to 30 bauds without critical relay adjustment.
Frequency Stability.
10. The main transmitter shall be capable of maintaining a frequency tolerance of plus or minus 0.1 per centum throughout every transmission without adjustment of controls, notwithstanding—
(a) variations of the impedance of the aerial or other load to which it is connected; or
(b) variations of supply voltage not exceeding plus or minus 10 per centum.
First Schedule—continued.
Spurious and Harmonic Components in Output Signal.
11.—(1.) The radio-frequency output of the main transmitter shall be free from frequency components due to spurious oscillations in any part of the transmitter.
(2.) The maximum power output of the transmitter at any harmonic of the radio-frequency shall not exceed 20 milliwatts, whether type A1 or type A2 waves are being transmitted.
(3.) When the main transmitter is transmitting dots at a speed of 30 bauds, 95 per centum of the total power radiated from the transmitter shall be radiated within plus or minus 100 cycles per second of the steady-state carrier frequency for type A1 waves and within plus or minus 2,500 cycles per second of the steady-state carrier frequency for type A2 waves.
Operating Facilities.
12.—(1.) The main transmitter shall be so arranged that one operator can carry out, in not more than 10 seconds, all adjustments necessary to change it from operation on any one of the frequencies specified in paragraph 4 of this Schedule to operation on any other of those frequencies.
(2.) The main transmitter shall be capable of being operated on full power within 60 seconds after any part of it has been switched on.
(3.) If the main transmitter is so designed and constructed that it is necessary to delay the application of certain voltages for a period after it has been switched on, the delay shall be automatically provided by a delay switch.
(4.) The main transmitter shall be provided with a device which, when the transmitting key is not depressed, automatically brings into operation the main receiver in conjunction with which the transmitter is operated and means shall be provided for suppressing interference with reception caused by the transmitter.3
(5.) The main transmitter shall be capable of being used in conjunction with an automatic keying device.
Protective Arrangements.
13.—(1.) The main transmitter shall be so designed and constructed that when the transmitting key is depressed the aerial can be disconnected or the output can be short-circuited without damage being caused to the transmitter.
(2.) Means shall be provided for protecting the main transmitter from damage caused by excessive current or voltage.
Crystal Holders.
14. If the main transmitter is designed for use with piezo-electric crystals, it shall be capable of being used with a piezo-electric crystal unit conforming to an approved specification.
Artificial Aerial.
15.—(1.) An artificial aerial suitable for testing the main transmitter on full power shall be provided.
(2.) The artificial aerial shall include an indicator or lamp to indicate the passage of radio-frequency currents.
Aerial Ammeter.
16. The main transmitter shall be provided with an aerial ammeter.
Main Receiver.
General.
17.—(1.) The main receiver may consist of a single unit or of separate units each of which is capable of reception on a section or sections of the frequency range specified in the next succeeding paragraph.
(2.) The main receiver or, if it is not a single unit, each unit shall be capable of being connected without delay to the main and emergency aerials referred to in regulation 16 of these Regulations.
(3.) Each unit of the main receiver shall bear a plate stating the frequency range which the unit is intended to cover.
(4.) The main receiver shall not be constructed for operation, in whole or in part, from energy supplied by dry batteries.
(5.) If a vibrator power-unit is used, a stand-by vibrator, so arranged that it may be switched into circuit immediately, shall be provided.
First Schedule—continued.
Frequency Range and Types of Waves.
18.—(1.) In the case of a ship engaged on an international voyage, the main receiver shall be capable of—
(a) receiving signals of types A1, A2 and B within the frequency range 380 kilocycles per second to 535 kilocycles per second; and
(b) receiving signals of types A1, A2 and A3 within the frequency range 1,605
kilocycles per second to 25 megacycles per second.
(2.) In the case of a ship not engaged on an international voyage, the main receiver shall be capable of receiving signals of types A1, A2, A3 and B within the frequency ranges 380 kilocycles per second to 535 kilocycles per second and 1,605 kilocycles per second to 3,000 kilocycles per second.
Reception Facilities.
19. The main receiver shall be capable of headphone reception at all frequencies within the frequency ranges specified in sub-paragraph (1.) or (2.) of the last preceding paragraph, as the case requires.
Controls.
20.—(1.) The main receiver shall have—
(a) separate radio-frequency and audio-frequency gain controls;
(b) a means for reducing the receiver gain when the transmitting key of the transmitter is depressed, so that signals may be heard without inconvenience to the operator or damage to the receiver when the transmitter is keyed at signalling speeds of up to 30 words per minute;
(c) a switch for disconnecting the device, if any, for reducing the effect of impulsive noise signals;
(d) tuning controls which permit—
(i) rapid tuning throughout the frequency range covered by the receiver; and
(ii) fine tuning, by bandspread or otherwise, controlled by a knob of at least 2 inches diameter, the backlash of which shall not exceed 1 degree and which shall be so geared that, after backlash has been taken up, a rotation of 1 degree does not change the frequency of tune by more than 3 parts in 10,000 in the frequency range 380 kilocycles per second to 535 kilocycles per second or by more than 1 part in 10,000 in the frequency range 1,605 kilocycles per second to 25 megacycles per second;
(e) accurate means of resetting tune; and
(f) a scale for use with the means of rapid tuning.
(2.) If a logging scale is provided as the means of resetting tune, it shall be such that 1 inch on the scale corresponds to a frequency change of not more than 1 per centum.
(3.) The scale for use with the means of rapid tuning shall, unless calibration charts are provided for use with the scale, be calibrated directly in frequency.
General Method of Testing.
21. The main receiver shall comply with the requirements of paragraphs 22 to 34 (inclusive) of this Schedule when tested in the following manner or, if another manner is specified in relation to any of those paragraphs, when tested in that other manner:—
(a) An artificial aerial shall be used for the test and shall consist of a 75 ohm non-inductive resistor if the test is conducted at frequencies above 4 megacycles per second, and a 10 ohm resistor in series with a capacitor having a value of not less than 200 picofarads or more than 600 picofarads if the test is conducted at any other frequencies.
(b) Type A2 signals used in the test shall be modulated to a depth of 30 per centum and shall have a note frequency of 400 cycles per second.
(c) The frequency of the interfering or unwanted signals applied shall not be restricted to the frequency range of the receiver.
(d) The standard audio-frequency output level of the receiver for headphone reception (in the succeeding paragraphs of this Schedule relating to the main receiver referred to as “the standard output”) shall be 1 milliwatt into a resistance substantially equal to the modulus of the impedance of the telephone receivers at 1,000 cycles per second.
First Schedule—continued.
Selectivity.
22.—(1.) The selectivity preceding the final detector of the main receiver shall be variable, either continuously or in steps, and shall, throughout the frequency ranges respectively specified in the first column of the following table, and at the bandwidth settings respectively specified in the second column of that table, satisfy the requirements specified in the third column of that table in relation to those frequency ranges and bandwidths:—
First Column.
Second Column
Third Column.
Frequency Range.
Bandwidth Setting.
Selectivity Requirements.
1,605 kilocycles per second to 25 megacycles per second
Wide .......
1. Discrimination not exceeding 6 decibels to be obtained at frequencies removed from tune by 4 kilocycles per second
2. Discrimination of not less than 30 decibels to be obtained at frequencies removed from tune by 12 kilocycles per second
3. Discrimination of not less than 60 decibels to be obtained at frequencies removed from tune by 24 kilocycles per second
4. Discrimination of not less than 90 decibels to be obtained at frequencies removed from tune by 50 kilocycles per second except that discrimination of 60 decibels is sufficient against an interfering signal of a frequency exceeding 1.5 megacycles per second
380 kilocycles per second to 25 megacycles per second
Intermediate
1. Discrimination not exceeding 6 decibels to be obtained at frequencies removed from tune by 1.5 kilocycles per second
2. Discrimination of not less than 30 decibels to be obtained at frequencies removed from tune by 6 kilocycles per second
3. Discrimination of not less than 60 decibels to be obtained at frequencies removed from tune by 12 kilocycles per second
4. Discrimination of not less than 90 decibels to be obtained at frequencies removed from tune by 35 kilocycles per second, except that discrimination of 60 decibels is sufficient against an interfering signal of a frequency exceeding 1.5 megacycles per second
380 kilocycles per second to 25 megacycles per second
Narrow......
1. Discrimination not exceeding 6 decibels to be obtained at frequencies removed from tune by 0.5 kilocycles per second
2. Discrimination of not less than 30 decibels to be obtained at frequencies removed from tune by 2.5 kilocycles per second
3. Discrimination of not less than 60 decibels to be obtained at frequencies removed from tune by 5 kilocycles per second
4. Discrimination of not less than 90 decibels to be obtained at frequencies removed from tune by 25 kilocycles per second, except that discrimination of 60 decibels is sufficient against an interfering signal of a frequency exceeding 1.5 megacycles per second
First Schedule—continued.
(2.) If the receiver is a superheterodyne receiver, the image response ratio of the receiver shall, where the frequency of wanted signals is as specified in the first column of the following table, be not less than the ratio specified in the second column of that table opposite the reference to the frequency in the first column:—
First Column.
Second Column.
Frequency of Wanted Signal.
Image Response Ratio.
Not less than 380 kilocycles per second but not exceeding 535 kilocycles per second
80 decibels
Not less than 1,605 kilocycles per second but not exceeding 7 megacycles per second
60 decibels
Exceeding 7 megacycles per second but not exceeding 15 megacycles per second
40 decibels
Exceeding 15 megacycles per second...........................
25 decibels
(3.) If the receiver is a superheterodyne receiver, the intermediate frequency response ratio shall—
(a) be not less than 90 decibels at intermediate frequencies being not less than 140 kilocycles per second and not more than 1,600 kilocycles per second; and
(b) be not less than 60 decibels at any other intermediate frequency.
Sensitivity.
23. The standard output of the main receiver shall be obtained, at all frequencies specified in the first column of the following table and at all bandwidth settings and both when the automatic gain control is on and off, with an input not exceeding that specified in the second column of that table opposite the reference to the frequency in the first column in the case of type A1 signals, or that specified in the third column of that table opposite the reference to the frequency in the first column in the case of type A2 signals:—
First Column.
Second Column.
Third Column.
Frequency.
Maximum Input— Type A1 Signals.
Maximum Input— Type A2 Signals.
Not less than 380 kilocycles per second but not exceeding 535 kilocycles per second
20 decibels above 1 microvolt
30 decibels above 1 microvolt
Not less than 1,605 kilocycles per second but not exceeding 10 megacycles per second
10 decibels above 1 microvolt
20 decibels above 1 microvolt
Exceeding 10 megacycles per second but not exceeding 25 megacycles per second
20 decibels above 1 microvolt
30 decibels above 1 microvolt
Signal/noise Ratio.
24.—(1.) The signal/noise ratio of the main receiver shall, at any frequency specified in the first column of the following table and at the bandwidth setting specified in the second column of that table opposite the reference to the frequency in the first column, be not less than the ratio specified in the third column of that table opposite the reference to the frequency in the first column, when receiving any signal of type A1 or type A2 of the relevant maximum input specified in the table in the last preceding paragraph with the receiver gain adjusted to give the standard output:—
First Column.
Second Column.
Third Column.
Frequency.
Bandwidth Setting.
Signal/noise Ratio.
Not less than 380 kilocycles per second but not exceeding 535 kilocycles per second
Intermediate
10 decibels
Not less than 1,605 kilocycles per second but not exceeding 4 megacycles per second
Wide
10 decibels
Exceeding 4 megacycles per second but not exceeding 10 megacycles per second
Wide
20 decibels
Exceeding 10 megacycles per second but not exceeding 25 megacycles per second
Wide
25 decibels
(2.) For the purposes of this paragraph, spurious whistles shall be deemed to be noise.
First Schedule—continued.
Automatic Gain Control.
25.—(1.) The main receiver shall be provided with an automatic gain control, capable of operating efficiently on type A1, A2 and A3 waves of all frequencies not less than 380 kilocycles per second or more than 25 megacycles per second and of being switched out of circuit.
(2.) The automatic gain control shall be such that, when the receiver is adjusted to give the standard output with a type A2 input signal 10 decibels above the relevant maximum input specified in the table in paragraph 23 of this Schedule on any frequency not less than 1,605 kilocycles per second or more than 25 megacycles per second—
(a) an increase in input of 20 decibels results in an improvement in the signal/ noise ratio of at least 15 decibels; and
(b) an increase in input of 60 decibels does not increase the output by more than 10 decibels.
(3.) The charge time constant of the automatic gain control system shall be between 0.05 second and 0.2 second and the discharge time constant shall be between 0.5 second and 2 seconds.
Output Limiting.
26. An increase in the input to the main receiver of 60 decibels when—
(a) the automatic gain control is switched off; and
(b) the receiver is adjusted to give the standard output with a type A1 input signal 20 decibels above the relevant maximum input specified in the table in paragraph 23 of this Schedule,
shall not increase the output by more than 10 decibels.
Blocking.
27. The change in the output of the main receiver shall not exceed 3 decibels when—
(a) the bandwidth is set at “intermediate”;
(b) the automatic gain control is in operation;
(c) the receiver is adjusted to give the standard output with an input wanted signal of type A2 at a level of 60 decibels above 1 microvolt and of any frequency not less than 380 kilocycles per second or more than 25 megacycles per second; and
(d) a type A1 input signal at a level of 100 decibels above 1 microvolt and at a frequency 10 kilocycles per second above or below the wanted frequency is then simultaneously applied.
Cross Modulation.
28. The main receiver shall not produce an output of level higher than 30 decibels below the standard output when—
(a) the bandwidth is set at “intermediate”;
(b) the automatic gain control is in operation;
(c) the receiver is adjusted to give the standard output with an input wanted signal of type A2 at a level of 60 decibels above 1 microvolt and of any frequency not less than 380 kilocycles per second or more than 25 megacycles per second;
(d) the modulation of the signal is switched off; and
(e) a type A2 input signal at a level of 90 decibels above 1 microvolt and at a frequency 10 kilocycles per second above or below the wanted frequency is then simultaneously applied.
Intermodulation and Harmonic Production.
29. An output exceeding the standard output shall not be produced by the main receiver—
(a) when—
(i) the bandwidth is set at “intermediate”;
(ii) the automatic gain control is switched off;
(iii) the receiver is adjusted to give the standard output with an input wanted signal of type A2 at a level of 30 decibels above 1 microvolt and at any frequency not less than 380 kilocycles per second or more than 535 kilocycles per second;
First Schedule—continued.
(iv) the input wanted signal has been removed; and
(v) two unwanted signals, one of type A1 and the other of type A2 of which the frequency difference or frequency sum is the same as the frequency of the wanted signal, and each of which is of a level of 110 decibels above 1 microvolt and of such a frequency as to give no appreciable output when applied alone, are then simultaneously applied; or
(b) when—
(i) the bandwidth is set at “intermediate”;
(ii) the automatic gain control is switched off;
(iii) the receiver is adjusted to give the standard output with an input wanted signal of type A2 at a level of 30 decibels above 1 microvolt and at any frequency not less than 380 kilocycles per second or more than 535 kilocycles per second;
(iv) the input wanted signal has been removed; and (v) a type A2 signal, of a level of 116 decibels above 1 microvolt and of a frequency one-half of that of the wanted signal, is applied.
Fidelity.
30.—(1.) The maximum change is level of the output of the main receiver shall be less than 8 decibels while the modulation frequency of an input signal of constant level and modulation depth is varied continuously from 300 cycles per second to 2,500 cycles per second when the bandwidth is set at “wide” for the reception of type A3 waves having a frequency above 1,605 kilocycles per second.
(2.) The main receiver shall comply with the requirement of the last preceding sub-paragraph when the level and modulation depth of the input signal are such that the output of the receiver does not exceed the standard output.
Non-linear Distortion.
31. With the automatic gain control switched on, the total harmonic content of the audio-frequency output of the main receiver at any output not exceeding the standard output shall not exceed—
(a) 5 per centum with an input signal of a frequency of 500 kilocycles per second at any level between 30 decibels and 80 decibels above 1 microvolt and sinusoidally modulated to a depth of 30 per centum at 400 cycles per second; or
(b) 15 per centum with such an input signal modulated to a depth of 80 per centum at 400 cycles per second.
Tuning Drift and Stability.
32. The tuning drift and stability of the main receiver shall comply with the following requirements:—
(a) After the receiver has been switched on for 5 minutes, the changes of tune frequency during any period of 5 minutes shall not exceed the value shown in the second column of the following table within the frequency range shown in the first column of that table opposite that value in the second column:—
First Column.
Second Column.
Frequency Range.
Maximum Change.
380 kilocycles per second to 535 kilocycles per second..
3 parts in 10,000
1,605 kilocycles per second to 25 megacycles per second..
1 part in 10,000
First Schedule—continued.
(b) A change of 5 per centum in any one of the supply voltages to the receiver shall not produce, within a frequency range shown in the first column of the following table, a maximum change of tune frequency exceeding the value shown in the second column of that table opposite the reference to the frequency range in the first column:—
First Column.
Second Column.
Frequency Range.
Maximum Change.
380 kilocycles per second to 535 kilocycles per second ..
3 parts in 10,000
1,605 kilocycles per second to 25 megacycles per second
1 part in 10,000
(c) A change in ambient temperature of 5 degrees Centigrade within the range of 0 degrees Centigrade to 50 degrees Centigrade applied after the receiver has been switched on for 1 hour shall not produce, within a frequency range shown in the first column of the following table, a maximum change of tune frequency exceeding the value shown in the second column of that table opposite the reference to the frequency range in the first column:—
First Column.
Second Column.
Frequency Range.
Maximum Change.
380 kilocycles per second to 535 kilocycles per second ..
10 parts in 10,000
1,605 kilocycles per second to 25 megacycles per second
3 parts in 10,000
Heterodyne Note Stability.
33. The heterodyne note stability of the main receiver shall be such that—
(a) the frequency of a heterodyne note which is initially 1 kilocycle per second shall not vary by more than 100 cycles per second when the input level referred to in sub-paragraph (b) of paragraph 26 of this Schedule is increased by not more than 60 decibels; and
(b) it is possible at all input levels within the range specified in the last preceding sub-paragraph to obtain a beat note of 200 cycles per second when tuning either towards or away from zero beat.
Radiation.
34.—(1.) The main receiver shall not, when in use, produce a field exceeding 0.1 microvolt per metre when measured at a distance of 1 mile from the receiver.
(2.) The receiver shall be deemed to comply with the requirements of the last preceding sub-paragraph if, when—
(a) the receiver is placed centrally in a screened earthed enclosure at least 6 feet cube;
(b) the earth terminal of the receiver is connected to the inside of the screen;
(c) the aerial terminal is connected through an unscreened four-turn rectangular search coil 1 foot square situated within the enclosure and an unscreened lead to a resistive measuring instrument mounted outside the enclosure and having its other terminal earthed; and
(d) the receiver is energized and unscreened headphones are connected to it,
the power measured by the measuring instrument does not exceed 4 x 10-10 watt whatever the resistance of the measuring instrument or the adjustment of the receiver and notwithstanding that the search coil is short-circuited or moved in any way, other than a way that causes it to approach within 6 inches of the receiver case.
First Schedule—continued.
Emergency Transmitter.
General,
35. The emergency transmitter shall be provided with such equipment as is necessary to enable it to operate from the emergency source of electrical energy referred to in sub-regulation (5.) of regulation 18 of these Regulations, and shall be capable of being connected without delay to the main and emergency aerials referred to in regulation 16 of these Regulations.
Types of Waves and Frequency Range.
36. The emergency transmitter shall be capable of transmitting continuously type A2 waves on the frequency of 500 kilocycles per second.
Source of Energy.
37.—(1.) The emergency transmitter shall be capable of operation from the emergency source of energy referred to in sub-regulation (5.) of regulation 18 of these Regulations.
(2.) If a vibrator power unit is employed, a standby vibrator, so arranged that it may be immediately switched into circuit, shall be provided.
Range of Load Impedance.
38. The emergency transmitter shall be capable of complying with all the requirements of this Schedule applicable to it when connected to an artificial load, one side of which is earthed, consisting of a resistance in series with a capacitance in each of the following combinations:—
(a) a resistance of 4 ohms in series with a capacitance of 250 picofarads;
(b) a resistance of 3.6 ohms in series with a capacitance of 300 picofarads;
(c) a resistance of 2.8 ohms in series with a capacitance of 400 picofarads;
(d) a resistance of 2.2 ohms in series with a capacitance of 500 picofarads;
(e) a resistance of 2 ohms in series with a capacitance of 600 picofarads; and
(f) a resistance of 1.9 ohms in series with a capacitance of 750 picofarads.
Power of Emergency Transmitter.
39.—(1.) For the purposes of this paragraph, the power of the emergency transmitter shall be deemed to be the mean power developed in the artificial load during a period when the transmitting key is depressed.
(2.) The power of the emergency transmitter shall be not less than 15 watts when the source of energy is developing 90 per centum of its rated voltage.
(3.) When adjusted to develop its maximum power, the emergency transmitter shall be capable of—
(a) continuous operation for the transmission of telegraph signals at any speed up to 25 bauds; and
(b) operation under steady marking or steady spacing conditions for a period of not less than 15 minutes.
Modulation.
40.—(1.) The carrier wave shall be modulated to a depth of not less than 75 per centum or more than 100 per centum.
(2.) The harmonic content of the modulating envelope shall not exceed 30 per centum.
Note Frequency.
41. The note frequency of the emergency transmitter shall be not less than 500 cycles per second or more than 1,200 cycles per second.
Speed of Transmission.
42. The emergency transmitter shall be capable of transmitting telegraph signals at all speeds up to 25 bauds without critical adjustment of relays.
First Schedule—continued.
Frequency Stability.
43. The emergency transmitter shall be capable of maintaining a frequency tolerance of plus or minus 0.5 per centum throughout every transmission without adjustment of controls notwithstanding variations of the impedance of the aerial or of any other load to which it is connected, or variations of supply voltage not exceeding plus or minus 10 per centum.
Operating Facilities.
44.—(1.) The emergency transmitter shall be capable of being operated on full power within 6 seconds after it has been switched on.
(2.) The emergency transmitter shall be capable of being used in conjunction with the automatic keying device specified in this Schedule.
Protective Arrangements.
45.—(1.) The emergency transmitter shall be so designed and constructed that, when it is adjusted to develop its maximum power and the transmitting key is depressed, the aerial can be disconnected or the output can be short-circuited without damage being caused to any part of the transmitter.
(2.) Means shall be provided for protecting the emergency transmitter from damage caused by excessive current or voltage.
Crystal Holders.
46. If the emergency transmitter is designed for use with piezo-electric crystals, it shall be capable of being used with a piezo-electric crystal unit conforming to a specification approved for the purposes of paragraph 14 of this Schedule.
Artificial Aerial.
47.—(1.) An artificial aerial suitable for testing the emergency transmitter on full power shall be provided.
(2.) The artificial aerial shall include an indicator or lamp to indicate the passage of radio-frequency currents.
Aerial Ammeter.
48. The emergency transmitter shall be provided with an aerial ammeter.
Use for Normal Communications.
49. If the emergency transmitter is used otherwise than in an emergency or for the tests required by paragraph (b) of sub-regulation (4.) of regulation 26 of these Regulations, paragraphs 4, 7, 9, 10, 11 and 12 of this Schedule shall apply in relation to it as if it were the main transmitter.
Emergency Receiver.
Connexion to Emergency Aerial.
50. The emergency receiver shall be capable of being connected without delay to the main aerial or to the emergency aerial referred to in regulation 16 of these Regulations.
Frequency Range and Types of Waves.
51. Subject to the provisions of the next succeeding paragraph, the emergency receiver shall be capable of receiving type A2 waves and type B waves throughout the frequency range from and including 488 kilocycles per second to and including 513 kilocycles per second and a wide band-pass shall be provided for that purpose.
Reception Facilities.
52. The emergency receiver shall be capable of headphone reception and loudspeaker reception throughout the frequency range specified in the last preceding paragraph, unless two emergency receivers, one of which is capable of headphone reception, with or without tuning, throughout that range and the other of loudspeaker reception throughout that range without tuning, are provided.
First Schedule—continued
Source of Energy.
53.—(1.) The emergency receiver shall be capable of operation both from the main source of electrical energy required by sub-regulation (1.) of regulation 18 of these Regulations and the emergency source of electrical energy required by sub-regulation (5.) of that regulation.
(2.) If the ship is equipped with two emergency receivers complying with the requirements referred to in the last preceding paragraph, the receiver capable of loudspeaker reception is not required to be capable of operation from the emergency source of electrical energy.
(3.) The receiver shall comply with the requirements of paragraphs 56 to 64 (inclusive) of this Schedule notwithstanding variations in the supply voltage not exceeding—
(a) plus 5 per centum or minus 10 per centum of the nominal voltage when operated from the emergency source of electrical energy; or
(b) plus 10 per centum or minus 10 per centum of the nominal voltage when operated from the main source of electrical energy.
(4.) If a vibrator power unit is employed, a standby vibrator, so arranged that it may be switched into circuit immediately, shall be provided.
Controls.
54. The emergency receiver shall be provided with—
(a) a manual gain control;
(b) if only a single emergency receiver is provided, a switch for changing the receiver from operation from the main source of electrical energy to the emergency source of electrical energy; and
(c) if the receiver is designed to tune to frequencies additional to the frequency range specified in paragraph 51 of this Schedule, a switch for changing reception to the frequency range so specified.
Method of Testing.
55. The emergency receiver shall comply with paragraphs 56 to 64 (inclusive) of this Schedule when tested in the manner specified in those paragraphs or, where no manner of testing is so specified, in the following manner:—
(a) An artificial aerial shall be used for the test and shall consist of a 10 ohm resistor in series with a capacitor having a value of not less than 200 picofarads or more than 600 picofarads.
(b) Type A2 signals used in the test shall be modulated to a depth of 30 per centum and shall have a note frequency of 400 cycles per second.
(c) The standard audio-frequency output level (in the succeeding paragraphs of this Schedule relating to the emergency receiver referred to as “the standard output”) of the receiver shall be—
(a) for headphone reception—10 decibels below 1 milliwatt into a resistance substantially equal to the modulus of the impedance of the telephone receivers at 1,000 cycles per second; and
(b) for loudspeaker reception—17 decibels above 1 milliwatt into a resistance that loads the output valve with the load appropriate to the valve.
Selectivity.
56.—(1.) Subject to the next succeeding sub-paragraph, the selectivity preceding the final detector of the emergency receiver shall, if it is provided with a wide band-pass, satisfy the following requirements at the relative frequencies specified:—
(a) not more than 4 decibels discrimination relative to the maximum response shall be obtained at frequencies not less than 488 kilocycles per second or more than 513 kilocycles per second;
(b) not less than 30 decibels discrimination relative to the maximum response shall be obtained at frequencies less than 475 kilocycles per second or more than 525 kilocycles per second;
(c) not less than 60 decibels discrimination relative to the maximum response shall be obtained at frequencies less than 450 kilocycles per second or more than 550 kilocycles per second; and
(d) not less than 90 decibels discrimination relative to the maximum response shall be obtained at frequencies less than 400 kilocycles per second or more than 600 kilocycles per second.
First Schedule—continued.
(2.) If the receiver is a superheterodyne receiver, the intermediate frequency response ratio shall not be less than 60 decibels when the intermediate frequency is outside the limits 140 kilocycles per second to 1,600 kilocycles per second.
(3.) If the receiver, being a receiver capable of headphone reception, is tunable over the frequency range specified in paragraph 51 of this Schedule, the selectivity preceding the final detector at all frequencies within that range shall satisfy the following requirements:—
Discrimination.
Corresponding Bandwidth.
10 decibels........................
Not less than 4 kilocycles per second
30 decibels........................
Not more than 50 kilocycles per second
60 decibels........................
Not more than 100 kilocycles per second
More than 60 decibels................
More than 100 kilocycles per second
Sensitivity.
57. The standard output shall be obtained with an input signal of type A2 not exceeding 40 decibels above 1 microvolt.
Signal/Noise Ratio.
58. The signal/noise ratio, with an input signal of type A2 of 40 decibels above 1 microvolt and when the manual gain control is adjusted to give the standard output, shall be not less than 20 decibels.
Blocking.
59. If the emergency receiver is intended for loudspeaker reception the change in the output of the receiver shall not exceed 3 decibels when—
(a) the receiver is adjusted to give the standard output with an input wanted signal of type A2 at a level of 60 decibels above 1 microvolt and of the frequency of 500 kilocycles per second; and
(b) a type A1 input signal at a level of 100 decibels above 1 microvolt and of the frequency of 440 kilocycles per second or 560 kilocycles per second is then applied simultaneously.
Cross Modulation.
60. If the emergency receiver is intended for loudspeaker reception, the receiver shall not produce an output of level higher than 30 decibels below the standard output when—
(a) the receiver is adjusted to give the standard output with an input wanted signal of type A2 at a level of 60 decibels above 1 microvolt and of the frequency of 500 kilocycles per second;
(b) the modulation of the signal is switched off; and
(c) a type A2 signal at a level of 90 decibels above 1 microvolt and of the frequency of 425 kilocycles per second or 575 kilocycles per second is then applied simultaneously.
Intermodulation and Harmonic Production.
61. If the emergency receiver is intended for loudspeaker reception, an output exceeding the standard output shall not be produced by the receiver when—
(a) the receiver is adjusted to give the standard output with an input wanted signal of type A2 at a level of 40 decibels above 1 microvolt and of the frequency of 500 kilocycles per second;
(b) the input wanted signal has been removed; and
(c) either—
(i) any two interfering signals, one of type A1 and the other of type A2, the frequency sum or difference of which is 500 kilocycles per second and each of which is at a level of 110 decibels above 1 microvolt and of such frequency as to give no appreciable output when applied alone, are then simultaneously applied; or
(ii) a signal of type A2 at a level of 116 decibels above 1 microvolt and of the frequency of 250 kilocycles per second is applied.
First Schedule—continued.
Reduction of Gain.
62. If the emergency receiver is intended for loudspeaker reception, the receiver shall be provided with an efficient and automatic means of reducing the gain during the reception of strong signals.
Tuning Drift and Stability.
63. The tuning drift and the stability of the emergency receiver shall be such that, within 5 minutes after the receiver is switched on, the requirements of paragraph 56 of this Schedule are met.
Fidelity.
64.—(1.) The fidelity of the emergency receiver shall be such that a change in the audio-frequency output shall be less than 8 decibels when the modulation frequency of the input signal is varied continuously from 400 cycles per second to 1,400 cycles per second, the level and modulation depth of the input signal being kept constant.
(2.) For the purposes of the last preceding sub-paragraph, the input signal may have any level and depth of modulation provided that the output of the receiver does not exceed the standard output.
Radiation.
65.—(1.) The emergency receiver when in use shall not produce a field exceeding 0.1 microvolt per metre when measured at a distance of 1 mile from the receiver.
(2.) The receiver shall be deemed to comply with the requirement of the last preceding sub-paragraph if, when—
(a) the receiver is placed centrally in a screened earthed enclosure at least 6 feet cube;
(b) the earth terminal of the receiver is connected to the inside of the screen;
(c) the aerial terminal is connected through an unscreened four-turn rectangular search coil 1 foot square situated within the enclosure and an unscreened lead to a resistive measuring instrument mounted outside the enclosure and having its other terminal earthed; and
(d) the receiver is then energized and unscreened headphones are connected to it,
the power measured by the measuring instrument does not exceed 4 x 10-10 watt whatever the resistance of the measuring instrument or the adjustment of the receiver and notwithstanding that the search coil is short-circuited or moved in any way, other than a way that causes it to approach within 6 inches of the receiver case.
Automatic Keying Device.
66.—(1.) The automatic keying device shall be capable—
(a) of being connected in place of the manual transmitting key, by a jack or other efficient means, to—
(i) the main transmitter;
(ii) the emergency transmitter; and
(iii) the auto-alarm test signal generator referred to in paragraph 1 of the Fifth Schedule; and
(b) when connected to any of the equipment specified in the last preceding sub-paragraph—
(i) of keying automatically the alarm signal specified in paragraph 68 of this Schedule and, immediately after so doing, stopping and opening the keying circuit unless re-set or re-wound; and
(ii) of keying automatically the distress call specified in paragraph 69 of this Schedule in such manner that, if the device is used without attention, the automatic keying of the distress call will be repeated once every 12 minutes.
(2.) The device shall not be capable of keying a signal other than a signal specified in paragraph 68 or 69 of this Schedule.
67.—(1.) When switched out of circuit after transmission of the distress call, the automatic keying device shall be capable of being re-set by automatic or manual means so that, after the device has again been switched into circuit, keying shall commence within 10 seconds at the beginning of the distress call.
(2.) If the re-setting is by manual means, the device shall include a means for indicating when re-setting is necessary.
First Schedule—continued.
68. The alarm signal referred to in clause (b) of sub-paragraph (1.) of paragraph 66 of this Schedule shall consist of 12 dashes each of 4 seconds’ duration separated by spaces of 1 second, the length of the dashes and spaces being maintained within a tolerance of plus or minus 0.2 second.
69.—(1.) The distress call referred to in clause (b) of sub-paragraph (1.) of paragraph 66 of this Schedule shall consist of the following signals in the following order:—
(a) the distress signal, that is to say, the morse characters for the letters “SOS” repeated three times;
(b) the morse characters for the word DE;
(c) the morse characters for the ship’s call sign repeated three times; and
(d) a long dash having a duration of at least 20 seconds,
(2.) The characters of the distress signal shall be keyed at a speed of not more than 16 words per minute, the duration of the long dash shall be not less than 20 seconds and the total length of the distress call shall not exceed 90 seconds.
70. If the automatic keying device is electrically operated, the source of electrical energy by which it is operated shall be the emergency source of electrical energy referred to in sub-regulation (5.) of regulation 18 of these Regulations.
Image unavailable in extracted textSecond Schedule. Regulation 6
RADIOTELEPHONY INSTALLATIONS.
General.
Components.
1. A radiotelephony installation shall include a transmitter and a receiver.
Definition.
2. In this Schedule, “the equipment” includes the transmitter and receiver, and all other equipment necessary for the operation of the installation, but does not include an aerial.
Types of Wave and Frequency Range.
3. The equipment shall be capable of adjustment for the transmission of both type A2 and A3 waves on any frequency of not less than 1,605 kilocycles per second or more than 2,850 kilocycles per second and on the frequency 6,280 kilocycles per second, and for the reception of type A2, A3 and B waves on any frequency of not less than 380 kilocycles per second or more than 3,000 kilocycles per second and on any frequency of not less than 6 megacycles per second or more than 7 megacycles per second.
Operating Frequencies.
4.—(1.) The transmitter shall be capable of transmitting type A2 and type A3 waves and of being set for transmission on—
(a) the radiotelephone distress frequency;
(b) the frequency of 2,760 kilocycles per second;
(c) one other spot frequency not being less than 1,605 kilocycles per second or more than 2,850 kilocycles per second; and
(d) the frequency of 6,280 kilocycles per second, but shall not be capable of being operated otherwise than on spot frequencies.
(2.) The receiver shall be capable of receiving type A2, A3 and B signals within the frequency range of 380 kilocycles per second to 3,000 kilocycles per second and the frequency range of 6 megacycles per second to 7 megacycles per second.
Power Supply.
5. The equipment shall be capable of being operated from the supply of electrical energy referred to in regulation 36 of these Regulations.
Size of Controls.
6. All controls on the installation shall be of such size as will permit normal adjustments being performed by a person wearing thick gloves.
Second Schedule—continued.
Facilities for Two-way Communication.
7.—(1.) The equipment shall be capable of changing instantaneously from transmitting to receiving, and from receiving to transmitting, by means of a pressed or other single switch, aerial change-over relays and such other devices as are necessary for that purpose and if, in addition, a voice-operated device is provided, the operating lag shall not exceed 10 milli-seconds, and the release lag shall be not less than 150 milli-seconds and not more than 200 milli-seconds.
(2.) Means shall be provided for protecting the receiver from damage when the equipment is transmitting.
Transmitter.
Selection of Frequencies.
8. Selection of any of the transmitter frequencies referred to in paragraph 3 of this Schedule shall be by a single switch or pushbutton.
Load Impedance.
9. The transmitter shall comply with the requirements specified in this Schedule when connected to an artificial load of 10 ohms resistance in series with a 250 picofarads capacitance at frequencies of net less than 1,605 kilocycles per second or more than 2,850 kilocycles per second and of 250 ohms resistance in series with a 12 micro-henrys inductance at the frequency 6,280 kilocycles per second.
Carrier Power.
10. The total carrier power delivered by the transmitter to the artificial load referred to in the last preceding paragraph (not including power dissipated in an aerial tuning inductor or any other component forming part of the transmitter) shall, on any frequency of not less than 1,605 kilocycles per second or more than 2,850 kilocycles per second, be not less than 50 watts and not more than 100 watts and on the frequency of 6,280 kilocycles per second be not less than 10 watts and not more than 50 watts.
Peak Limiter.
11. A peak limiter shall be provided to prevent over-modulation of the transmitter.
Speech Modulation.
12. The speech modulation of the transmitter shall be such that—
(a) the frequency response of the microphone and transmitter together shall not vary by more than 7.5 decibels from a value which rises at the rate of 6 decibels per octave from 250 cycles per second to 2,500 cycles per second; and
(b) the response relative to the peak response shall not be higher than—
(i) minus 20 decibels at all frequencies exceeding 3,500 cycles per second but not exceeding 5,000 cycles per second; and
(ii) minus 40 decibels at all frequencies exceeding 5,000 cycles per second.
Peak Modulation.
13. The modulating system shall be such that the peak modulation of the transmitter is not less than 80 per centum or more than 95 per centum for any sound pressure the root mean square value of which, measured in the plane of the microphone mouthpiece with a pure wave of 1,000 cycles per second, is not less than 25 dynes or more than 100 dynes per square centimetre.
Harmonic Content.
14. The harmonic content of the modulated output voltage shall not exceed ten per centum when—
(a) the transmitter is operating at, or below, its rated power and is modulated to a depth of 90 per centum by a sinusoidal wave of a frequency of 400 cycles per second applied to the microphone terminals; and
(b) the peak limiter is rendered inoperative.
Second Schedule—continued.
Frequency Stability.
15. The transmitter shall be capable of maintaining a frequency tolerance of plus or minus 0.02 per centum throughout every transmission without adjustment of controls, notwithstanding—
(a) variations of the impedance of the aerial or other load to which it is connected; or
(b) variations of supply voltage not exceeding plus or minus 10 per centum.
Spurious and Harmonic Components in Output Signal.
16.—(1.) The radio-frequency output of the transmitter shall be free from frequency components due to spurious oscillations in any part of the equipment.
(2.) The output power at any harmonic of the radio-frequency shall not exceed 0.1 watt.
(3.) With the microphone open or short-circuited—
(a) the total noise and hum power in the output wave shall be at least 20 decibels below the carrier power; and
(b) the total noise and hum power contained in the sidebands corresponding to audio-frequencies within the limits of 250 cycles per second and 3,000 cycles per second shall be at least 40 decibels below the carrier power.
Operating Facilities.
17. The transmitter shall be such that—
(a) one operator can carry out, in not more than 10 seconds, all adjustments necessary to change the transmitter from operation on any one of the frequencies referred to in paragraph 4 of this Schedule to operation on any other of those frequencies;
(b) if the transmitter is so designed and constructed that it is necessary to delay the application of certain voltages for a period after it has been switched on, the delay is automatically provided by a delay switch;
(c) an indicator shows when the transmitter is ready for operation; and
(d) a skilled person can make alterations in the spot frequencies within the limits specified in paragraph 3 of this Schedule without removing the installation from the ship.
Depth of Modulation.
18. When the transmitter is adjusted for transmission of type A2 waves—
(a) the depth of modulation shall not be less than 70 per centum or more than 100 per centum;
(b) the note frequency shall not be less than 500 cycles per second or more than 1,200 cycles per second; and
(c) the transmitter shall be capable of transmitting telegraph signals at all speeds of up to 25 bauds without critical relay adjustment.
Protective Arrangements.
19.—(1.) The transmitter shall be so designed and constructed that when it is adjusted for maximum power the aerial may be disconnected or the output short-circuited without damage being caused to any part of the installation.
(2.) Means shall be provided for protecting the transmitter from damage caused by excessive current or voltage.
Receiver.
General.
20.—(1.) The receiver may consist of a single unit or of separate units, each of which is capable of reception on a section or sections of the frequency range specified in the next succeeding paragraph.
(2.) The receiver or, if it is not a single unit, each unit shall be capable of being connected without delay to the aerial (not being the spare aerial) referred to in regulation 34 of these Regulations.
(3.) Each unit of the receiver shall bear a plate stating the frequency range it is intended to cover.
(4.) The receiver shall not be constructed for operation in whole or in part from energy supplied by dry batteries.
Second Schedule—continued.
Frequency Range and Types of Waves.
21. The receiver shall be capable of receiving waves of types A2, A3 and B within the frequency range of 380 kilocycles per second to 3,000 kilocycles per second and the frequency range of 6 megacycles per second to 7 megacycles per second.
Reception Facilities.
22. The receiver shall be capable of both telephone and loudspeaker reception throughout the frequency range specified in the last preceding paragraph.
Controls.
23. The receiver shall be provided with—
(a) a manual audio-frequency gain control;
(b) means for reducing the receiver gain when the transmitting key of the transmitter is depressed, so that signals may be heard without inconvenience to the operator or damage to the receiver when the transmitter is keyed at signalling speeds up to 25 bauds per minute;
(c) a switch for disconnecting the device, if any, for reducing the effect of impulsive noise signals;
(d) a tuning control, the backlash of which does not exceed 1 degree and which is so geared that, after any backlash has been taken up, a rotation of 1 degree does not change the frequency of tune by more than 1 kilocycle over the whole tuning range; and
(e) a scale, calibrated directly in frequency, for use with the tuning control referred to in the last preceding sub-paragraph.
General Method of Testing.
24. The receiver shall comply with the requirements of paragraphs 25 to 35, inclusive, of this Schedule, when tested in the following manner or, if another manner is specified in relation to any of those paragraphs, when tested in that other manner:—
(a) An artificial aerial shall be used for the test and shall consist of—
(i) a 10 ohm resistor in series with a capacitor having a value of not less than 200 picofarads and not more than 600 picofarads at frequencies of not less than 1,605 kilocycles per second and not more than 3,000 kilocycles per second; and
(ii) a 250 ohm resistor in series with a 12 microhenry inductance at frequencies of not less than 6 megacycles per second and not more than 7 megacycles per second.
(b) Type A2 signals used in the test shall be modulated to a depth of 30 per centum and shall have a note frequency of 400 cycles per second.
(c) The frequency of the unwanted signals applied shall not be restricted to the frequency range of the receiver.
(d) The standard audio-frequency output level of the receiver (in the succeeding paragraphs of this Schedule referred to as “the standard output”) shall be—
(i) for telephone receiver reception—one milliwatt into a resistance substantially equal to the modulus of the impedance of the telephone receivers at 1,000 cycles per second; and
(ii) for loudspeaker reception—50 milliwatts into a resistance which loads the output valve with the load appropriate to the valve.
Selectivity.
25.—(1.) The selectivity of the receiver at a point immediately preceding the final detector shall be such that—
(a) discrimination of not more than 6 decibels is obtained at frequencies removed from tune by 2.5 kilocycles per second;
(b) discrimination of not less than 30 decibels is obtained at frequencies removed from tune by 7.5 kilocycles per second; and
(c) discrimination of not less than 60 decibels is obtained at frequencies removed from tune by 20 kilocycles per second.
(2.) If the receiver is a superheterodyne receiver—
(a) the image discrimination shall be not less than 40 decibels at frequencies not higher than 3,000 kilocycles per second and not less than 30 decibels at frequencies not lower than 6 megacycles per second; and
(b) the intermediate frequency response ratios shall be not less than 60 decibels over the entire tuning range.
Second Schedule—continued.
Sensitivity.
26. The standard output of the receiver shall be obtained with an input signal of type A2 not exceeding 30 decibels above 1 microvolt.
Signal/noise Ratio.
27.—(1.) The signal/noise ratio of the output of the receiver shall be at least 20 decibels when the receiver is adjusted to give the standard output with an input signal of type A2 modulated 30 per centum at an input level of 30 decibels above 1 microvolt.
(2.) For the purpose of this paragraph, spurious whistles shall be deemed to be noise.
Automatic Gain Control.
28.—(1.) The receiver shall be provided with an automatic gain control, capable of operating efficiently on type A2 and type A3 waves.
(2.) The automatic gain control shall be such that, when the receiver is adjusted to give the standard output with an input signal of type A2 modulated 30 per centum at an input level of 30 decibels above 1 microvolt, an increase in input of 60 decibels does not increase the output by more than 10 decibels.
Blocking.
29. The change in the output of the receiver shall not exceed 3 decibels when—
(a) the receiver is adjusted to give the standard output with an input wanted signal of type A2 at a level of 60 decibels above 1 microvolt; and
(b) a type A1 input signal is simultaneously applied at a level of 100 decibels above 1 microvolt and at a frequency 20 kilocycles per second above or below the wanted frequency.
Cross Modulation.
30. The receiver shall not produce an output of level higher than 30 decibels below the standard output when—
(a) the receiver with the automatic gain control in operation is adjusted to give the standard output with an input wanted signal of type A2 at a level of 60 decibels above 1 microvolt and of a frequency of not less than 380 kilocycles per second or more than 3,000 kilocycles per second or of a frequency of not less than 6 megacycles per second or more than 7 megacycles per second;
(b) the modulation of the signal generator has been switched off; and
(c) a type A2 input signal is simultaneously applied at a level of 90 decibels above 1 microvolt and at a frequency 20 kilocycles per second above or below the wanted frequency.
Intermodulation and Harmonic Production.
31. The receiver shall not produce an output exceeding the standard output when—
(a) the receiver with the automatic gain control out of operation is adjusted to give the standard output with an input signal of type A2 modulated 30 per centum at a level of 30 decibels above 1 microvolt;
(b) the wanted signal has been removed; and
(c) two unwanted signals, one of type A1 and the other of type A2, of which the frequency sum or frequency difference is the same as the frequency of the wanted signal and each of which is of a level 100 decibels above 1 microvolt and of such a frequency as to give no appreciable output when modulated and applied alone, are simultaneously applied.
Fidelity.
32.—(1.) The maximum change in level of the output of the receiver shall be less than 8 decibels when the modulation frequency of an input signal of constant level and modulation depth is varied continuously from 250 cycles per second to 3,000 cycles per second.
(2.) The receiver shall comply with the requirement of the last preceding subparagraph when the level and depth of modulation of the input signal are such that the output of the receiver does not exceed the standard output.
Second Schedule—continued.
Non-Linear Distortion.
33. With the automatic gain control switched on, the total harmonic content of the audio-frequency output of the receiver at any output not exceeding the standard output shall not exceed 10 per centum with an input signal at any level between 40 decibels and 80 decibels above 1 microvolt and sinusoidally modulated to a depth of 30 per centum at 400 cycles per second.
Tuning Drift and Stability.
34. The tuning drift and stability of the receiver shall comply with the following requirements:—
(a) After the receiver has been switched on for 5 minutes, the changes of tune frequency over the whole tuning range during any period of 5 minutes shall not exceed 10 parts in 10,000.
(b) A change of 10 per centum in any one of the supply voltages to the receiver shall not produce a maximum change of tune frequency exceeding 10 parts in 10,000.
(c) A change in ambient temperature of 5 degrees Centigrade within the range of 0 degrees Centigrade to 50 degrees Centigrade applied after the receiver has been switched on for 1 hour shall not produce a maximum change of tune frequency exceeding 10 parts in 10,000.
Heterodyne Note Stability.
35. The heterodyne note stability of the receiver shall be such that—
(a) the frequency of a heterodyne note which is initially 1 kilocycle per second when the receiver is adjusted to give the standard output with a type A1 input signal 20 decibels above the maximum input specified in paragraph 26 of this Schedule in relation to type A1 waves does not vary by more than 100 cycles per second when the input level is increased by not more than 60 decibels; and
(b) it is possible at all input levels within the range specified in sub-paragraph (a) of this paragraph to obtain a beat note of 200 cycles per second when tuning either towards or away from zero beat.
Radiation.
36.—(1.) The receiver shall not, when in use, produce a field exceeding 0.1 microvolt per metre when measured at a distance of 1 mile from the receiver.
(2.) The receiver shall be deemed to comply with the requirement of the last preceding sub-paragraph if, when—
(a) the receiver is placed centrally in a screened earthed enclosure at least 6
feet cube
(b) the earth terminal of the receiver is connected to the inside of the screen;
(c) the aerial terminal is connected through an unscreened four-turn rectangular search coil 1 foot square situated within the enclosure and an unscreened lead to a resistive measuring instrument mounted outside the enclosure and having its other terminal earthed; and
(d) the receiver is then energized and unscreened headphones are connected to it,
the power measured by the measuring instrument does not exceed 4 x 10-10 watt whatever the resistance of the measuring instrument or the adjustment of the receiver and notwithstanding that the search coil is short-circuited or moved in any way, other than a way that causes it to approach within 6 inches of the receiver case.
Image unavailable in extracted textThird Schedule. Regulation 7
CLIMATIC AND DURABILITY TESTS.
General.
1. In this Schedule—
(a) a reference to Class B equipment shall be read as a reference to equipment appropriated for use only below deck or in a deckhouse or other like compartment; and
(b) a reference to Class X equipment shall be read as a reference to equipment appropriated for use or storage in the open or in an open boat.
Third Schedule—continued.
2.—(1.) Class B equipment shall be subjected to the tests specified in the first column of the table in this sub-paragraph and Class X equipment shall be subjected to the tests specified in the second column of that table, in the order indicated by the numbers preceding the references to those tests in those columns.
(2.) Where the provisions of this Schedule require the equipment to be kept working for the purposes of any test, power shall be supplied to the equipment at the voltage at which the equipment is intended to be operated.
3. The tests referred to in the last preceding paragraph shall be conducted in accordance with the succeeding provisions of this Schedule.
Vibration Test.
4. The equipment, complete with its chassis covers and shock absorbers (if any), and in its normal operating position, shall be clamped to a vibration table.
5. The table shall be vibrated at all frequencies between 0 and 12.5 cycles per second at an amplitude of plus or minus 0.16 centimetre while the equipment is kept working continuously.
6. The table shall be so vibrated for 3 periods each of 8 minutes’ duration.
7. The direction of the vibration during each period referred to in the last preceding paragraph shall be perpendicular to the direction of the vibrations during the other two periods.
Bump Test.
8. The equipment shall be subjected to not less than 500 bumps at a constant rate, not being less than 1 bump or more than 4 bumps per second, with a free drop of at least 2.5 centimetres.
Dry Heat Test.
9. Class B equipment shall be placed in a chamber which is maintained at a constant temperature of 55 degrees Centigrade, within a tolerance of plus or minus 1 degree Centigrade, and be kept working continuously at that temperature for a period of 2 hours.
10. Class X equipment shall be placed in a chamber which is maintained for a period of 10 hours at a constant temperature of 70 degrees Centigrade, within a tolerance of plus or minus 1 degree Centigrade. The chamber shall then be cooled to a constant temperature of 55 degrees Centigrade, within a tolerance of plus or minus 1 degree Centigrade, and the equipment shall be kept working continuously at that temperature for a period of 2 hours.
Damp Heat Test.
11. The equipment shall be placed in a chamber which shall, within a period not exceeding 2 hours, be heated from room temperature to 40 degrees Centigrade and brought to a relative humidity of not less than 95 per centum.
12. The chamber shall be kept at a temperature of 40 degrees Centigrade, within a tolerance of plus or minus 1 degree Centigrade, for a period of 12 hours, and at a relative humidity of not less than 95 per centum.
Third Schedule—continued.
13. At the beginning of the last hour of the period of 12 hours, all accessible surfaces and components shall be wiped dry and any fans or drying lamps provided in the equipment shall be switched on.
14. After the fans or drying lamps have been in operation for 30 minutes and while the temperature of the chamber is still 40 degrees Centigrade, within a tolerance of plus or minus 1 degree Centigrade, the equipment shall be operated and checked.
15. The temperature of the chamber shall then, in preparation for the low temperature test, be allowed to fall below 25 degrees Centigrade, the equipment being retained in the chamber.
Low Temperature Test.
16. Class B equipment shall be exposed to a temperature of minus 15 degrees Centigrade, within a tolerance of plus or minus 1 degree Centigrade, at normal atmospheric pressure for a period of not less than 12 hours.
17. Class X equipment shall be exposed to a temperature of minus 25 degrees Centigrade, within a tolerance of plus or minus 1 degree Centigrade, at normal atmospheric pressure for a period of not less than 12 hours.
Rain Test.
18. The equipment shall be placed in a chamber fitted with 8 shower heads, the discharge end of each of which consists of a flat, non-rustable metal plate, 0.16 centimetre thick, having 36 holes each of 0.1 centimetre diameter evenly spaced in concentric circles in the following manner:—
16 holes on the periphery of a circle of 5.1 centimetres diameter.
8 holes on the periphery of a circle of 3.8 centimetres diameter.
8 holes on a periphery of a circle of 2.5 centimetres diameter.
4 holes on the periphery of a circle of 1.3 centimetres diameter.
19. The shower heads shall be arranged at a distance of not less than 50 centimetres and not more than 80 centimetres from the equipment in such a manner that spray from 4 of the shower heads is directed downwards at an angle of 45 degrees at each of the four uppermost corners of the equipment, and the spray from the other 4 shower heads is directed horizontally at the centre of each area of the four sides of the equipment.
20. Fresh water at room temperature and at a static pressure not being less than 15 pounds per square inch or more than 25 pounds per square inch shall be sprayed on the equipment from the shower heads for a period of 1 hour, the equipment being in the position in which it is normally operated.
21. The equipment shall, throughout the test, be rotated at not less than 12 and not more than 20 revolutions per minute about a vertical axis passing through the centre of the equipment.
Immersion Test.
22. The equipment, in the condition in which it will normally be kept on board ship, shall be immersed in water the surface of which is at least 10 centimetres above the highest point of the equipment, and shall remain so immersed for a period of 1 hour.
23. Upon its removal from the water the equipment shall be drained of water.
Corrosion Test (Salt Water).
24. The equipment shall be placed in a chamber fitted with apparatus capable of spraying in the form of a fine mist either natural sea water, or water which contains, within a tolerance of plus or minus 10 per centum, the following percentages of salts in solution:—
25. The spraying apparatus shall be such that the products of corrosion cannot mix with the sea water or solution contained in the spray reservoir.
26. The equipment shall be sprayed simultaneously on all its external surfaces with the sea water or solution for a period of 1 hour and shall be kept working continuously for the second 30 minutes of that hour.
Third Schedule—continued.
27. The equipment shall immediately after the expiration of the hour be stored for a period of 7 days at a temperature of 40 degrees Centigrade, within a tolerance of plus or minus 1 degree Centigrade, and at a relative humidity of not less than 60 per centum and not more than 80 per centum.
28. The equipment shall be so sprayed and stored on four separate occasions.
Corrosion Test (Acid Fumes).
29. A battery included in the equipment shall be fully charged and then fitted into the equipment.
30. If the battery can be charged without being removed from the equipment, the battery shall continue to be charged at the maximum rate appropriate to it for a period of 24 hours.
31. The equipment shall immediately after the expiration of that period be stored for a period of 4 weeks at a temperature of 40 degrees Centigrade, within a tolerance of plus or minus 1 degree Centigrade and at a relative humidity of not less than 60 per centum and not more than 80 per centum.
Mould Growth Test.
32. The equipment shall be inoculated by spraying with an aqueous suspension of mould spores containing the cultures specified in the first column, or the cultures specified in the second column, of the following table:—
First Column.
Second Column.
Aspergillus niger
Aspergillus niger
Aspergillus amstelodami
Aspergillus amstelodami
Paecilomyces varioti
Aspergillus versicolor
Stachybotrys atra
Stachybotrys atra
Penicillium brevi-compactum
Penicillium brevi-compactum
Penicillium cyclopium
Cladosporum herbasum
Chaetomium globosum
33. Immediately after it has been so sprayed, the equipment shall be placed in a chamber the temperature of which shall be maintained at a fixed value not less than 31 degrees Centigrade or more than 33 degrees Centigrade and controlled to within a tolerance of plus or minus 1 degree Centigrade at a relative humidity of not less than 95 per centum, and shall be kept in the chamber for a period of 28 days.
Image unavailable in extracted textFourth Schedule. Regulations 10, 31 and 32
RADIOTELEGRAPHY EQUIPMENT IN OR FOR LIFEBOATS.
PART I.
Fixed Equipment.
Definition.
1. In Part I. of this Schedule, “the equipment” means the fixed radiotelegraphy equipment to be provided in lifeboats.
Components.
2. The equipment shall include a radiotelegraphy transmitter and receiver, an aerial and earth system, a source of energy and such other equipment as is necessary for the operation of the installation.
General Requirements.
3.—(1.) The equipment shall be so designed that an unskilled person can readily cause it to transmit the signals referred to in paragraph 20 of this Schedule.
(2.) The purpose of all controls not required for transmitting those signals shall be clearly and permanently indicated.
Fourth Schedule—continued.
4. Simple instructions for the operation of the equipment on the frequencies specified in paragraphs 14 and 21 of this Schedule shall be affixed in clear and permanent form to or near the equipment.
5. All controls shall be of such size as will permit normal adjustments to be made by a person wearing thick gloves and, in particular, all tuning knobs shall be at least 2 inches in diameter.
6. The change-over from transmitting to receiving and from receiving to transmitting, including automatic change of aerial connexions, shall be made by means of one switch.
7. The equipment shall be readily removable from the lifeboat.
8. An electric lamp of a power not less than 3 watts or more than 15 watts, with a waterproof casing, shall be provided to illuminate the control panels and the instructions.
9.—(1.) An electrical heater, connected to the ship’s main source of electrical energy, and capable of maintaining the interior of the case in which the equipment is installed at a temperature at least 10 degrees Centigrade above the ambient temperature, shall be provided.
(2.) The heater shall be so mounted that it reduces the risk of the controls or cover of the equipment becoming frozen into position but does not cause any part of the installation to become overheated.
10.—(1.) All parts of the equipment, other than the aerial and its terminal, which are not at earth potential shall be enclosed.
(2.) The aerial terminal shall be guarded against accidental contact.
11. The equipment shall be capable of complying with the performance require-ments specified in this Schedule while the lifeboat engine is running, and whether or not the battery is being charged.
Aerial and Earth System.
12.—(1.) The equipment shall include—
(a) a single-wire aerial of high conductivity stranded or braided wire capable of being supported by the lifeboat mast without the use of top-masts at a maximum height of not less than 22 feet above the waterline; and
(b) an earth system which shall be of the same material throughout and shall consist of at least three independent bolted connexions—
(i) to the hull, in the case of a metal lifeboat; or
(ii) to a bare copper plate at least six square feet in area fixed to the hull below the waterline, in the case of a wooden lifeboat.
(2.) The aerial system shall be mechanically sound.
(3.) All practicable steps shall be taken to reduce aerial losses to a minimum.
(4.) All parts of the aerial which may come in contact with occupants of the lifeboat when the equipment is in use shall be insulated.
Source of Energy.
13—(1.) The equipment shall include one 24-volt battery composed of secondary cells and of a capacity sufficient to operate the receiver for 4 hours and immediately after the expiration of that period to run the transmitter under full-power marking conditions for 2 hours.
(2.) If it is intended to operate a searchlight from the battery, the capacity of the battery shall be at least 30 ampere hours in excess of that referred to in the last preceding sub-paragraph.
(3.) The battery shall be capable of being completely recharged—
(a) in not more than 20 hours from a dynamo working in conjunction with, and throughout the normal range of speeds of, the lifeboat engine if the battery is not in use at the same time; and
(b) from the ship’s main source of electrical energy without being removed from the lifeboat.
(4.) The battery shall be such that it does not spill when tilted to an angle of 60 degrees from its normal position in any direction,
(5.) The battery shall be electrically isolated from the rest of the equipment when the transmitter and receiver are switched off.
(6.) If a vibrator power unit is employed, a reserve vibrator shall be provided and so controlled by a change-over switch that it can be put into circuit immediately.
Fourth Schedule—continued.
Transmitter.
14. The equipment shall include a transmitter capable of—
(a) sending continuously, but not simultaneously, type A2 waves on the frequencies of 500 kilocycles per second and 8,364 kilocycles per second—
(i) by manual operation at all speeds up to at least 25 bauds without critical relay adjustment; and
(ii) by means of an automatic keying device complying with the requirements of paragraph 20 of this Schedule; and
(b) maintaining, without adjustment of any control, a frequency tolerance throughout every transmission of—
(i) plus or minus 0.5 per centum on the frequency of 500 kilocycles per second; and
(ii) plus or minus 0.02 per centum on the frequency of 8,364 kilocycles per second, notwithstanding variations of the impedance of the aerial or of any other load to which it is connected, or of supply voltage, within plus or minus 10 per centum; and
(c) operation on full power within 30 seconds of being switched on.
15. The carrier wave shall be modulated to a depth of 100 per centum by a wave of rectangular character so that the carrier is switched on for not less than 30 per centum and not more than 50 per centum of a modulation cycle.
16. The note frequency shall be not less than 500 cycles per second and not more than 1,200 cycles per second.
17. The power of the transmitter—
(a) shall not be less than 15 metre-amperes on the frequency of 500 kilocycles per second, when determined in the manner prescribed by sub-regulation (3.) of regulation 17 of these Regulations;
(b) shall not be less than 50 watts on the frequency of 500 kilocycles per second, when measured into an artificial aerial consisting of a 30 ohm resistor in series with a capacitor of every value between 350 picofarads and 450 picofarads; and
(c) shall not be less than 15 watts on the frequency of 8,364 kilocycles per second when measured into an artificial aerial simulating the impedance of the aerial specified in paragraph 12 of this Schedule.
18. The transmitter shall be so designed and constructed that, when it is adjusted for maximum power and the transmitting key is depressed, the aerial may be disconnected or the output short-circuited without damage being caused to any part of the installation.
19.—(1.) An artificial aerial shall be provided for testing the transmitter on full power and shall include an indicator or lamp to indicate the passage of radio-frequency currents.
(2.) An aerial ammeter and a visual indicator to indicate the passage of radio-frequency current, the failure of either of which does not disconnect the aerial circuit, shall be provided.
Automatic Transmission.
20.—(1.) A device for automatic keying which, when switched into circuit with the transmitter, is capable of automatically—
(a) sending the alarm signal specified in sub-paragraph (2.) of this paragraph
and immediately afterwards stopping and opening the keying circuit unless reset or re-wound; and
(b) sending the distress call specified in sub-paragraph (3.) of this paragraph in such manner that if the device is used without attention the transmission will be repeated once every 12 minutes until the source of electrical energy is exhausted and switching off the electrical energy to the transmitter in the silent interval between those transmissions and, so far as is necessary for the protection of the transmitter, automatically delaying the application of electrical energy after the device has been switched on,
shall be provided as part of the equipment.
(2.) The alarm signal shall consist of 12 dashes each of 4 seconds’ duration separated by spaces of 1 second, the length of the dashes and spaces being maintained within a tolerance of plus or minus 0.2 second.
Fourth Schedule—continued.
(3.) The distress call shall consist of the distress signal (that is to say, the Morse characters for the letters “S O S”) repeated three times, followed by a long dash, the characters of the distress signal being transmitted at a speed of not less than 8 and not more than 16 words per minute, and the duration of the long dash being not less than 20 seconds. The duration of the call shall not exceed 90 seconds.
(4.) Means shall be provided to ensure that, when the distress signal is sent, the transmission begins at the commencement of the signal within 40 seconds after the device for automatic keying has been switched into circuit.
(5.) The mechanism for keying the distress call specified in sub-paragraph (3.) of this paragraph shall be such that it can be readily adapted to send a distress call consisting of the following signals in the following order over a period not exceeding 90 seconds:—
(a) the distress signal (that is to say, the Morse characters for the letters “S O S”) repeated three times;
(b) the Morse characters for the word “DE”;
(c) the Morse characters for the lifeboat’s call sign repeated three times; and
(d) a long dash having a duration of not less than 20 seconds.
Receiver.
21. The equipment shall include a receiver capable of—
(a) receiving type A2 and type B waves; and
(b) being tuned over the frequency range 488 kilocycles per second to 513 kilocycles per second.
22. If high frequency reception facilities are provided, the receiver shall be capable of receiving type A1 and type A2 waves on any frequency within the frequency band 8,266 kilocycles per second to 8,745 kilocycles per second.
23. The receiver shall be fitted with a manual gain control.
24. Headphones shall be provided and shall be shrouded to exclude noise.
25. The receiver shall comply with the requirements of paragraphs 26 to 29, inclusive, of this Schedule when tested in the following manner:—
(a) an artificial aerial consisting of a 40 ohm resistance in series with a 2 microhenry inductance and a 100 picofarad capacitance shall be used;
(b) a type A2 signal shall, unless otherwise specified, be modulated to a depth of 30 per centum at 400 cycles per second; and
(c) the standard audio-frequency output shall be 1 milliwatt into a resistance substantially equal to the modulus of the impedance of the telephone receivers at 1,000 cycles per second.
26.—(1.) The selectivity of the receiver shall, at a point immediately preceding the final detector, be such that, over the frequency range 488 kilocycles per second to 513 kilocycles per second—
(a) discrimination of not more than 6 decibels is obtained at frequencies removed from tune by 1 kilocycle per second;
(b) discrimination of not less than 6 decibels is obtained at frequencies removed from tune by 4 kilocycles per second;
(c) discrimination of not less than 30 decibels is obtained at frequencies removed from tune by 20 kilocycles per second; and
(d) discrimination of not less than 60 decibels is obtained at frequencies removed from tune by 50 kilocycles per second.
(2.) In the case of a superheterodyne receiver, the image response ratio shall be at least 20 decibels.
27. The sensitivity of the receiver shall be such that the standard audio-frequency output is obtained with an input not exceeding the following levels:—
Frequencies.
Maximum Input for Type A1 Waves.
Maximum Input for Type A2 Waves.
500 kilocycles per second.......
.........................
40 decibels above 1 microvolt
8,364 kilocycles per second (if provided)
30 decibels above 1 microvolt
40 decibels above 1 microvolt
Fourth Schedule—continued.
28. The signal/noise ratio shall, with the inputs and waves respectively specified in the last preceding paragraph and with the rotary converter or vibrator running, be not less than—
(a) 15 decibels on the frequency of 500 kilocycles per second; and
(b) 25 decibels on the frequency of 8,364 kilocycles per second, if provided.
29.—(1.) The fidelity of the receiver shall be such that the change in level of the audio-frequency output shall be less than 8 decibels when the modulation frequency of an input signal of constant level and modulation depth is varied continuously from 300 cycles per second to 1,500 cycles per second.
(2.) The receiver shall comply with the requirement of the last preceding subparagraph when the level and depth of modulation of the input signal are such that the output of the receiver does not exceed the standard audio-frequency output.
Connexions with Ship’s Mains.
30. Connexions of the equipment with the ship’s main source of electrical energy shall be so provided as not to interfere with the launching of the lifeboat.
PART II.
Portable Equipment.
Components.
31. The portable radiotelegraphy equipment to be provided for lifeboats (in the succeeding provisions of this Schedule referred to as “the portable equipment”) shall include a hand generator, a transmitter, a receiver and such other apparatus as is necessary for the operation of the equipment.
General.
32. Simple instructions for the operation of the portable equipment on the frequencies specified in paragraph 37 of this Schedule shall be affixed in clear and permanent form to the equipment.
33. The portable equipment shall bear a removable plate on which shall be indicated in clear and permanent form the call sign of the lifeboat in letters and Morse characters.
Design and Construction.
34. The portable equipment shall be so designed and constructed that—
(a) the entire equipment is contained in a single unit or the entire equipment other than the mast referred to in sub-paragraph (b) of paragraph 35 of this Schedule is contained in a single unit and that mast is attached to the single unit;
(b) an unskilled person can erect the aerial system and, without difficulty and by simple operation and automatic means, can transmit the radio-telegraphy signals specified in sub-paragraph (1.) of paragraph 40 of this Schedule;
(c) the equipment is provided with handles and is readily portable by one person;
(d) it is watertight and capable of floating in water;
(e) it may be dropped from a height of 30 feet into water without damage;
(f) it may be lowered into the sea or a lifeboat from the boat deck;
(g) it may be clamped to a lifeboat;
(h) the number of manual controls are kept to the minimum required to meet the requirements of this Schedule, but include—
(i) send/receive switching;
(ii) a switch for changing transmission from 500 kilocycles per second to 8,364 kilocycles per second and vice versa;
(iii) a switch position so that the transmitter valve filaments can be energized continuously while the receiver is energized; and
(iv) a single control of receiver gain;
(i) all manual controls are of such size as to permit normal adjustments to be made by a person wearing thick gloves; and
(j) the operation of manual controls is not impeded by, and does not impede, the generation of electrical energy by the hand generator.
Fourth Schedule—continued.
Aerial and Earth Systems.
35. The equipment shall include—
(a) a single-wire aerial consisting of not less than 30 feet of high conductivity stranded or braided wire so fitted as to be capable of being supported from the lifeboat mast without the use of top-masts at the maximum practicable height;
(b) a collapsible stayed mast capable of being easily and quickly installed in a lifeboat and of supporting the aerial at a height of at least 16 feet above the sea when the base of the mast is resting on the bottom of a lifeboat in which it is intended to be used; and
(c) an earth wire of high conductivity firmly connected to the equipment and loaded in such a manner that the wire will sink when placed overboard.
Hand Generator.
36.—(1.) The hand generator shall be of such design and construction that, when the handle of the generator is rotated at any speed within the normal range of handle speeds—
(a) sufficient electrical energy is generated to enable—
(i) the transmitter to comply with the requirements of sub-paragraph (5.) of paragraph 40 of this Schedule; and
(ii) the receiver to comply with the requirements of paragraphs 46 and 47 of this Schedule;
(b) the transmitter complies with the requirements of sub-paragraph (5.) of paragraph 40 of this Schedule with a torque-speed at the handle of not more than 400 expressed in pounds-feet multiplied by revolutions per minute; and
(c) an indicator lamp is lit, but that when the handle is rotated at a speed not within the normal range of handle speeds, the indicator lamp is not lit.
(2.) The hand generator shall be of such design and construction that—
(a) it can be operated by—
(i) one person; and
(ii) two persons simultaneously; and
(b) the handles cannot be rotated in the wrong direction.
(3.) In this paragraph and in succeeding paragraphs of this Schedule, the expression “normal range of handle speeds”, in relation to a generator, means the range of speeds extending from the minimum speed at which the generator will enable the transmitter forming part of the same equipment to comply with the requirements of sub-paragraph (5.) of paragraph 40 of this Schedule to a speed at least 40 per centum greater than that speed.
Transmitter.
37. The transmitter shall be capable of—
(a) sending continuously, but not simultaneously, type A2 waves on the frequencies of 500 kilocycles per second and 8,364 kilocycles per second—
(i) by manual operation at all speeds up to 16 bauds; and
(ii) by automatic means at the speeds specified in sub-paragraph (2.) of paragraph 40 of this Schedule;
(b) maintaining over the normal range of handle speeds throughout every transmission a frequency tolerance—
(i) of plus or minus 0.5 per centum on the frequency of 500 kilocycles per second; or
(ii) of plus or minus 0.02 per centum on the frequency of 8,364 kilocycles per second, without adjustment of any control, and notwithstanding any variations of the impedance of the aerial or artificial aerial to which it is connected; and
(c) operating on full power, when the aerial system or artificial aerial has been connected and the necessary controls have been adjusted, within 30 seconds after the generation of electrical energy has commenced.
38. The carrier wave shall be modulated to a depth of 100 per centum by a wave of rectangular character so that the carrier wave is switched on for not less than 30 per centum and not more than 50 per centum of a modulation cycle.
Fourth Schedule—continued.
39. The note frequency shall be not less than 450 cycles per second or more than 1,350 cycles per second.
40.—(1.) The signal to be sent by the automatic means referred to in sub-paragraph (a) of paragraph 37 of this Schedule shall—
(a) when the transmission is on the frequency of 500 kilocycles per second, consist of the alarm signal of 12 dashes each of 4 seconds’ duration separated by spaces of 1 second, followed by the distress signal (that is to say, the Morse characters for the letters “S O S”) repeated three times, and a long dash; and
(b) when the transmission is on the frequency of 8,364 kilocycles per second, include the distress signal repeated three times followed by a long dash of not less than 30 seconds’ duration.
(2.) Over the normal range of handle speeds—
(a) the speed of the automatic transmission of the distress signal shall be not less than 8 words and not more than 15 words per minute; and
(b) the tolerance in the timing of the dashes of the alarm signal Shall not exceed plus or minus 0.2 second.
(3.) The automatic transmissions shall cease and open the keying circuit after one complete transmission unless the mechanism is re-set or re-wound.
(4.) Means shall be provided—
(a) to ensure that the transmission begins at the commencement of the signal; and
(b) to indicate to the operator that the mechanism should be re-set or re-wound.
(5.) The mean power developed by the transmitter in the load during a marking period shall—
(a) when the transmission is on the frequency of 500 kilocycles per second, be not less than ((3.8 log 10C)—5.5) watts, C being the capacitance of the artificial aerial in picofarads, when measured with an artificial aerial consisting of a 15 ohm resistor in series with a capacitor having any value between the minimum capacitance of the aerial referred to in sub-paragraph (a) of paragraph 35 of this Schedule and 150 picofarads, and not less than 3.5 watts when measured with an artificial aerial consisting of a 30 ohm resistor in series with a capacitor having any value between 350 picofarads and 450 picofarads; and
(b) when the transmission is on the frequency of 8,364 kilocycles per second, be not less than 3 watts when measured with an artificial aerial consisting of a 40 ohm resistor in series with any inductive or capacitive reactance in the range plus 60 ohms to minus 60 ohms.
41. The aerial circuit shall include—
(a) a tuning control suitable for use with all types of aerial provided; and
(b) a tuning indicator, the failure of which does not disconnect the aerial circuit.
42.—(1.) An artificial aerial suitable for testing the transmitter on full power shall be provided within the equipment.
(2.) Means shall be provided for testing the facilities for automatic transmission without the generation of radio-frequency energy.
43. The transmitter shall be so designed and constructed that, when it is transmitting and adjusted for maximum power, the aerial may be disconnected or the output short-circuited without, in either case, damage being caused to any part of the equipment.
Receiver.
44. The receiver shall be a fixed tune receiver which shall be capable of receiving type A2 waves over the frequency band 490 kilocycles per second to 510 kilocycles per second when used with headphones.
45. Headphones shall be provided and shall be shrouded to exclude external noises and permanently attached to the receiver.
46. The receiver shall comply with the requirements of the next succeeding paragraph when tested in the following manner:—
(a) Artificial aerials shall be used and shall consist of either—
(i) a 15 ohm resistor in series with a capacitor having any value between the minimum capacitance of the aerial referred to in sub-paragraph (a) of paragraph 35 of this Schedule and 150 picofarads; or
Fourth Schedule—continued.
(ii) a 30 ohm resistor in series with a capacitor of any value within the range 350 picofarads to 450 picofarads.
(b) The signals used shall be type A2 signals modulated to a depth of 30 per centum at 400 cycles per second.
47. Over the normal range of handle speeds—
(a) the standard audio-frequency output of the receiver into a resistance substantially equal to the modulus of the impedance of the telephone receivers at 1,000 cycles per second shall be 1 milliwatt;
(b) the selectivity preceding the final detector of the receiver shall, at a frequency referred to in the first column of the following table, comply with the requirement specified in the second column of that table opposite the reference to the frequency in the first column:—
First Column.
Second Column.
Frequency.
Requirement.
Not less than 490 kilocycles per second or more than 510 kilocycles per second
Response to be uniform to within 6 decibels
Less than 460 kilocycles per second or more than 540 kilocycles per second
Not less than 40 decibels discrimination relative to the response at 500 kilocycles per second to be obtained
(c) the audio-frequency response of the receiver shall be uniform to within decibels over the range of modulation frequencies 400 cycles per second to 1,400 cycles per second and shall substantially fall for frequencies outside this range;
(d) the standard output specified in sub-paragraph (a) of this paragraph shall be obtained with a test signal input not exceeding 40 decibels above 1 microvolt on the frequency of 500 kilocycles per second; and
Image unavailable in extracted text(e) with the test signal specified in the last preceding sub-paragraph, the signal/ noise ratio shall be at least 15 decibels.
Fifth Schedule. Regulation 4
Auto-alarm.
General.
1. The auto-alarm shall—
(a) include a receiver, a selector, a test signal generator and an audible alarm system;
(b) be capable of giving audible warning of the receipt of an alarm signal consisting of a series of 12 consecutive dashes, each of a duration of 4 seconds and separated by intervals of 1 second in each case subject to the tolerances specified in sub-paragraph (a) of paragraph 16 of this Schedule;
(c) be capable of being connected without delay with the main aerial referred to in regulation 16 of these Regulations or to the emergency aerial;
(d) comply with the requirements of this Schedule notwithstanding variations of the supply voltage of—
(i) plus 5 per centum or minus 10 per centum if the equipment is operated from the emergency source of energy required by sub-regulation (5.) of regulation 18 of these Regulations, or from batteries; or
(ii) plus or minus 10 per centum if the equipment is operated from the main source of electrical energy required by sub-regulation (1.) of that regulation.
2. If a vibrator power unit is employed, a standby vibrator, so arranged that it may be switched into circuit immediately, shall be provided.
3. The receiver, selector and test signal generator shall be installed in the room or place from which the radiotelegraphy installation is operated.
Fifth Schedule—continued.
4. The auto-alarm shall be provided with a switch or system of switches by which it may be connected to the ship’s main aerial or to the emergency aerial.
5. The auto-alarm shall include a manual re-setting device to enable the selector to be re-set after the audible alarm system has been actuated.
Receiver.
6. The receiver forming part of the auto-alarm shall be capable of receiving type A2 waves and type B waves in each case on all note frequencies not less than 400 cycles per second or more than 1,400 cycles per second and on all carrier waves of a frequency not less than 492 kilocycles per second or more than 508 kilocycles per second.
7. All tuning controls and gain controls which affect the operation of the receiver as part of the auto-alarm shall be pre-set and shall not be capable of operation from the outside of the auto-alarm.
8. The receiver shall comply with the requirements of paragraphs 9 to 12, inclusive, of this Schedule when tested in the following manner or, where another method of testing is specified in any of those paragraphs, in the manner so specified:—
(a) An artificial aerial consisting of a 10 ohm resistor in series with a capacitor having any value between 300 picofarads and 750 picofarads shall be used.
(b) Type A2 signals used in the test shall be modulated to a depth of 70 per centum and shall have a note frequency of 400 cycles per second.
9. The selectivity of the receiver shall be such that—
(a) the radio-frequency response is uniform to within 3 decibels over the frequency range 492 kilocycles per second to 508 kilocycles per second;
(b) the total variation of audio-frequency response is not more than 3 decibels in the case of note frequencies in the range 400 cycles per second to 1,400 cycles per second;
(c) the audio-frequency response falls rapidly in the case of note frequencies below 400 cycles per second and above 1,400 cycles per second; and
(d) the auto-alarm gives response to an alarm signal of the frequency of 500 kilocycles per second and an input level of 40 decibels above 1 microvolt in the presence of another signal having the characteristics specified in the following table:—
10.—(1.) For the purposes of this paragraph, the sensitivity of the receiver is the minimum input level of the test alarm signal which, when injected at the frequency of 500 kilocycles per second, will operate the selector.
(2.) The sensitivity of the receiver shall be such that the selector will operate by the injection of an alarm signal from the test signal generator forming part of the auto-alarm.
(3.) The receiver shall be provided with an automatic gain control which—
(a) during periods when the selector is continuously in operation, steadily reduces the sensitivity of the receiver at a rate within the range 7.5 decibels to 15 decibels per minute in the case of a range of sensitivity of 40 decibels to 80 decibels above 1 microvolt, notwithstanding that the input level of an injected signal is at any level above the minimum necessary to operate the selector; and
Fifth Schedule—continued.
(b) during periods when the selector is not continuously in operation, steadily increases the sensitivity of the receiver to a maximum level of not less than 35 decibels or more than 40 decibels above 1 microvolt at a rate of increase within the range 30 decibels to 60 decibels per minute in the case of a range of sensitivity of 40 decibels to 80 decibels above 1 microvolt, notwithstanding that the input level of an injected signal is at any level below the level corresponding to the threshold of selector release.
11. The automatic gain control, when Morse interference is simulated by continuous keying of a test signal of the frequency of 500 kilocycles per second and an input level of 100 decibels above 1 microvolt with a mark-to-space ratio of 19 to 1 and variation of frequency of interruption is obtained by varying the speed of transmission, shall be such that—
(a) when the test signal produces three interruptions during each second, the sensitivity of the receiver is not reduced below that necessary for the reception of a signal of an input level of 40 decibels above 1 microvolt; and
(b) when the speed of the test signal is arranged so that there are three interruptions during each period of 2 seconds, the sensitivity of the receiver is so reduced after operating for a period of 15 minutes that a signal of at least 70 decibels above 1 microvolt is required to operate the selector.
12. If, in addition to the automatic gain control, a pre-set manual control of receiver gain is provided, the range of sensitivity variations provided by that control shall not exceed 10 decibels.
13. The receiver shall be such that the auto-alarm responds to a test alarm signal transmitted on any frequency in the range 492 kilocycles per second to 508 kilocycles per second and at an input level of 50 decibels above 1 microvolt in the presence of an interfering signal having the characteristics specified in the following table:—
Type of Signal.
Depth of Modulation.
Modulation Frequency.
Input Level.
Speed of Transmission.
Type A2
70 per centum
Any audio-frequency in the range 400 cycles per second to 1,400 cycles per second
120 decibels above 1 microvolt
Not less than 15 or more than 40 words per minute
14. The receiver shall be such that it does not operate the selector upon the simultaneous injection of any two continuous carrier waves, of which the frequency difference or sum is within the range 492 kilocycles per second to 508 kilocycles per second, having the following characteristics:—
Frequency.
Input Level.
Modulation.
Outside the range 450 kilocycles per second to 550 kilocycles per second
120 decibels above 1 microvolt
One unmodulated and the other modulated to a depth of 70 per centum at any audio-frequency in the range 400 cycles per second to 1,400 cycles per second
15.—(1.) The receiver shall be such that it does not in normal service produce a field exceeding 0.1 microvolt per metre when measured at a distance of 1 mile from the receiver, unless the test signal generator is in operation.
(2.) The receiver shall be deemed to comply with the requirements of the last preceding sub-paragraph if, when—
(a) the receiver is placed centrally in a screened earthed enclosure at least 6 feet cube;
Fifth Schedule—continued.
(b) the earth terminal of the receiver is connected to the inside of the screen;
(c) the aerial terminal of the receiver is connected through an unscreened search coil 1 foot square situated within the enclosure and an unscreened lead to a resistive measuring instrument mounted outside the enclosure and having its other terminal earthed; and
(d) the receiver is energized, the power measured by the measuring instrument does not exceed 4 x 10-10 watt whatever the resistance of the measuring instrument or the adjustment of the receiver, and notwithstanding that the search coil is short-circuited or moved in any way other than a way that causes it to approach within 6 inches of the receiver case.
Selector.
16. The selector, in conjunction with the receiver, shall be capable—
(a) of accepting dashes of a duration of not less than 3.5 seconds or more than 6.0 seconds and spaces between dashes, being spaces of a duration of not less than 0.01 second and not more than 1.5 seconds; and
(b) of rejecting dashes of a duration of less than 3.4 seconds or more than 6.2 seconds and spaces between dashes, being spaces of a duration of more than 1.6 seconds.
17. The selector, after accepting three or four consecutive dashes of the alarm signal, shall actuate the audible alarm system.
18. Any timing controls provided as part of the selector shall be pre-set and shall not be capable of being operated from the outside of the equipment.
Test Signal Generator.
19.—(1.) The test signal generator shall be capable of generating, for purposes of test, a signal having the characteristics specified in the following table:—
Type of Signal.
Frequency.
Depth of Modulation.
Modulation Frequency
Input Level.
Type A2
500 kilocycles per second
Not less than 70 per centum or more than 100 per centum
Any audio-frequency in the range 400 cycles per second to 1,400 cycles per second
Equivalent to a voltage modulated to a depth of 70 per centum within the range 37 decibels to 43 decibels above 1 microvolt in series with the artificial aerial
(2.) The test signal generator shall be capable of injecting into the receiver the alarm signal specified in sub-paragraph (b) of paragraph 1 of this Schedule within the tolerances specified in sub-paragraph (a) of paragraph 16 of this Schedule and the characteristics specified in the last preceding sub-paragraph, both by means of—
(a) a manual key of a non-locking type; and
(b) the automatic keying device specified in the First Schedule.
(3.) The method of injection shall be such that the test alarm signal does not operate the audible alarm system when the aerial is disconnected.
20. The test signal generator shall be so designed and constructed that the input level of the signal specified in sub-paragraph (1.) of the last preceding paragraph can be increased by approximately 20 decibels by means of a non-locking switch.
Audible Alarm System.
21.—(1.) The audible alarm system shall consist of three alarm bells installed respectively in the room or place from which the radiotelegraphy installation is operated, on the bridge and in the sleeping room of a radio officer.
(2.) The bells shall be operated from the source of electrical energy required by sub-regulation (5.) of regulation 18 of these Regulations by means of a power circuit taken from an unfused circuit, and so fused that the efficiency of the audible alarm system will not be affected by the rupture of a fuse other than a fuse forming part of that system.
Fifth Schedule—continued.
(3.) The power circuit shall be controlled by a locking switch situated on or near to the receiver forming part of the auto-alarm and clearly and permanently marked to indicate its purpose.
22. Subject to the provisions of the next succeeding paragraph, the alarm bells shall, whenever the auto-alarm is in operation as such, give an alarm—
(a) when actuated by the selector; and
(b) within 15 seconds after any failure for 9 seconds (subject to a tolerance of plus or minus 6 seconds) of—
(i) the direct-current voltage feeding the anode of a valve of the receiver forming part of the auto-alarm, if the receiver is not provided with a vibrator;
(ii) a vibrator forming part of the receiver;
(iii) a circuit of a filament of a directly-heated valve forming part of the receiver, if it is operated from the main source of electrical energy referred to in sub-regulation (1.) of regulation 18 of these Regulations; and
(iv) any continuously rotating mechanism forming part of a selector operated from that main source of electrical energy; and
(c) within 15 seconds after any failure of—
(i) a circuit of a filament of a directly-heated valve forming part of the receiver, if it is operated from batteries; or
(ii) any continuously rotating mechanism forming part of a selector operated from batteries.
23.—(1.) A device shall be provided which enables the bells situated on the bridge to be disconnected from the power circuit.
(2.) The device may include means for so disconnecting the bell situated in the radio officer’s sleeping room and shall be non-locking, but shall not be capable of disconnecting the bell in the room or place from which the radiotelegraphy installation is operated.
(3.) The device shall be clearly and permanently marked to indicate its purpose.
Field Test.
24. The auto-alarm shall be such that, when it is in operation for a period of 28 days in connexion with an aerial having an effective height of not less than 10 metres at a location nominated by the Minister, the auto-alarm is not actuated during that period by signals other than—
(a) signals locally generated to test the auto-alarm; and
(b) signals within the tolerances specified in sub-paragraph (a) of paragraph 16 of this Schedule.
Auto-Alarm used as an Emergency Radiotelegraphy Receiver.
25. If the auto-alarm is intended to be used as an emergency radiotelegraphy receiver, it shall, in addition to complying with the requirements specified in the preceding provisions of this Schedule, comply with the following requirements:—
(a) The receiver forming part of the auto-alarm shall be capable of—
(i) headphone reception and loudspeaker reception of the waves specified in paragraph 6 of this Schedule; and
(ii) operation from the main source of electrical energy referred to in sub-regulation (1.) of regulation 18 of these Regulations and the emergency source of electrical energy referred to in sub-regulation (5.) of that regulation.
(b) The receiver shall be provided with—
(i) a built-in switch for changing the operation of the receiver from the main source of electrical energy to the emergency source of electrical energy; and
(ii) a manual gain control so arranged that the performance of the auto-alarm as such is not impaired at any setting of the control.
(c) The standard audio-frequency output level of the receiver shall be—
(i) for headphone reception, 10 decibels below 1 milliwatt into a resistance substantially equal to the modulus of the impedance of the telephone receivers at 1,000 cycles per second; and
(ii) for loudspeaker reception, 17 decibels above 1 milliwatt into a resistance which loads the output valve with the load appropriate to the valve.
Fifth Schedule—continued.
26. The sensitivity of the receiver shall be such that, when measured with a signal interrupted in the manner specified in sub-paragraph (a) of paragraph 11 of this Schedule and modulated to a depth of 30 per centum, the standard audio-frequency output level shall be obtained with a signal input not exceeding 40 decibels above 1 microvolt.
27. When the manual gain control is adjusted to give the standard audio-frequency output of the receiver with the signal input specified in the last preceding paragraph, the signal/noise ratio shall be at least 20 decibels.
28. The receiver shall comply with paragraph 15 of this Schedule when used with unscreened headphones.
Image unavailable in extracted textSixth Schedule. Regulation 13
RADIO LOG-BOOK.
PART I.
Name of ship.
Official number and international call sign.
Port of registry.
Gross tonnage
Name of Company operating the Radio Service.....................................