Schedule Radiated signal characteristics - Broadcasting Services (Technical Planning) Guidelines 2007 - Radiated signal characteristics

Radiated signal characteristics

Channels

The width of the radio frequency channel shall be 9 kHz.
The channel spacing shall be 9 kHz with the lowest channel centre frequency being 531 kHz and the highest channel centre frequency being 1602 kHz.
Unless otherwise specified, the frequency of the carrier shall be maintained within 10 Hz.

Note Reference: ITU Radio Regulations (2001 edition), Appendix 2, Table of Transmitter Frequency Tolerances.

Main carrier location and modulation

The carrier shall be centrally located in the channel and shall be amplitude modulated to a maximum of 125 per cent positive and 100 per cent negative modulation by the sum signal (L+R). For stereo transmissions, the carrier shall also be phase modulated to a maximum of 1.26 radians by the combination of the difference signal (L‑R) and a 25 Hz pilot signal.

Polarisation of the radiated signal

Out‑of‑band and spurious emissions

The necessary bandwidth of the radio frequency emission is deemed to extend 9 kHz from the carrier frequency.
Any emission on a frequency removed from the carrier by more than 9 kHz, and up to and including 18 kHz, shall be attenuated at least 25 dB below the level of the carrier. Any emission on a frequency removed from the carrier by more than 18 kHz, and up to and including 27 kHz, shall be attenuated at least 35 dB below the level of the carrier. For frequencies removed from the carrier by more than 27 kHz, the level of any emission shall be further attenuated at a rate of 1 dB per kHz, or shall not exceed a level of 200 V/m, whichever is less stringent. The emission mask of the radiated signal is shown in figure A1‑1.
Out‑of‑band and spurious emissions shall be quoted with respect to the carrier level and shall be measured at a distance of one kilometre from the antenna system.

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Figure A1.1: Emission mask for radiated field strength