Schedule 2 Device boundaries and device Schedule 2 Device boundaries and device boundary criteria

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Turn the raw legal text into a practical explanation grounded in Radiocommunications (Unacceptable Levels of Interference – 850/900 MHz Band) Determination 2021.

Schedule 2 Device boundaries and device boundary criteria

(subsection 5(1), paragraph 10(1)(d), subparagraphs 10(2)(b)(i) and 10(3)(b)(i), and section 11)

Part 1 Device boundary of a transmitter

1. The device boundary of a single radiocommunications transmitter is established as follows:
Step 1: Calculate the device boundary criterion at each m×100 metre increment along each of the n\-degree radials, where:
(a) m is each of the integers from 2 through 530; and
(b) n is each of the integer degrees from 0 (true north) through 359.
Step 2: For each radial, find the latitude and longitude of the first point on the radial, moving away from the location of the transmitter (that is, with the lowest value of m) where either:
(a) the device boundary criterion, RP-MP, is less than or equal to 0; or
(b) m is equal to 530.
This point is the end point of the radial.
Step 3: The end point of each radial is the device boundary of the radiocommunications transmitter connected to that radial.

Note: RP-MP (the device boundary criterion) is calculated under Part 2 of this Schedule.

2. For a group of radiocommunications transmitters the device boundary is calculated as if for a single radiocommunications transmitter. However, the radiated power (RP) for a group of radiocommunications transmitters is taken:
(a) to be equal for each bearing σn; and
(b) to have a value that is equal to the maximum horizontally radiated power, in any direction, of any of the radiocommunications transmitters in the group.

Note: n is the bearing of the nth-degree radial for the group of radiocommunications transmitters.

Part 2 Device boundary criterion

1. The device boundary criterion is the value of the mathematical expression:
RP – MP
where:

MP	:	is PL(lmn,Lmn) + LOP – Gr;
RP	:	is the horizontally radiated power, measured in dBm EIRP per MHz, for each bearing, σn;
Note:		For a device with an active antenna system, the RP at bearing σn is defined as the sum of the gain of the antenna towards the horizontal plane and towards azimuth σn (dB) and the total radiated power (dBm). This allowance is based on the assumption that beam pointing angles and/or power can be controlled dynamically to ensure RP is not exceeded.
LOP	:	is the level of protection. For radiocommunications transmitters that incorporate an active antenna system (AAS) and are used specifically for beam-forming, the LOP is –92 dBm per MHz. For all other radiocommunications transmitters, the LOP is –100 dBm per MHz;

f		is the centre frequency of the radiocommunications transmitter in megahertz (MHz).
hgr		is the nominal receiver antenna height above ground level.
		is the transmitter effective antenna height (in metres) as defined in Schedule 3, except:if < 1.5 metres, then = 1.5 metres; orif > 500 metres then = 500 metres.
d(lmn, Lmn)		is the distance in kilometres between the location of the radiocommunications transmitter, (lt, Lt), and the mth increment on the nth radial (lmn, Lmn).