24Conditions — bi-directional amplifier station

24 Conditions – bi-directional amplifier station

(1) A person must not operate: (a) a bi-directional amplifier station; or (b) a radiocommunications transmitter that is externally linked to a bi-directional amplifier station; with a power greater than 1 W pY. (2) If a radiocommunications transmitter is externally linked to a bi-directional amplifier station, a person must not operate the transmitter unless: (a) if the transmitter is located in an area specified in subsection (3) – there is a device between the transmitter and the antenna used by the system that provides intermodulation performance equivalent to, or better than, the intermodulation performance achieved by a 20 dB in-line attenuator; and (b) if the transmitter is used to communicate with the base station in a land mobile system – the antenna used by the transmitter is a directional antenna with a minimum gain equivalent to the gain of a 6 element Yagi antenna.

Note 1: An attenuator is a component that reduces the power of a transmission that passes through it. An attenuator is ‘in-line’ if it is directly in the path of transmission.

Note 2: Gain refers to the ratio, commonly expressed in dB, of the power transmitted in the direction of peak radiation by the given antenna to the power transmitted by an antenna that radiates equally in all directions.

Note 3: An appropriate procedure for calculating intermodulation performance is set out in RALI LM 08, which is available, free of charge, from the ACMA’s website at www.acma.gov.au.

(3) For the purposes of paragraph (2)(a), the following areas are specified: (a) the area within 2 kilometres of the General Post Office of Adelaide; (b) the area within 2 kilometres of the General Post Office of Brisbane; (c) the area within 2 kilometres of the General Post Office of Melbourne; (d) the area within 2 kilometres of the General Post Office of Perth; (e) the area within 2 kilometres of the General Post Office of Sydney.