Document ID: chunk:federal_register_of_legislation:F2021C01288:reg:22:p2
Version: federal_register_of_legislation:F2021C01288
Segment Type: reg
Provision Reference: reg 22 (pt 2/4)
Character Range: 33996–36849

a frequency removed from the main carrier by more than 120 kHz, but not more than 240 kHz, must be attenuated at least 25 dB below the level of the unmodulated main carrier.
 (8) An emission caused by the transmission of an FM radio service on a frequency removed from the main carrier by more than 240 kHz, but not more than 600 kHz, must be attenuated at least 35 dB below the level of the unmodulated main carrier.
 (9) An emission caused by the transmission of an FM radio service on a frequency removed from the main carrier by more than 600 kHz must be attenuated either:
 (a) at least 43 + 10log P dB (where P is transmitter power in watts) below the level of the unmodulated main carrier; or
 (b) at least 80 dB below the level of the unmodulated main carrier;
  whichever is the lesser attenuation.
 (10) For the purposes of subguidelines (6) to (9) and this subguideline (10):
baseband signal means the composite modulating signal applied to produce frequency modulation of the main carrier.
Note: In mono transmissions without an ancillary communication service, the baseband signal is the audio signal.  An ancillary communications service is a separate supplementary information service on a modulated sub-carrier.
main carrier means the VHF signal modulated by the baseband signal.
Television and datacasting
 (11) The radiated signal characteristics of television and datacasting transmitters must comply with clause 6.2.10 and clauses C5, C6 and C7 in Appendix C of Australian Standard AS 4599.1‑2015 Digital television – Terrestrial broadcasting – Part 1: Characteristics of digital terrestrial television transmissions.
Digital radio
 (12) Subject to subguideline (13), the radiated signal characteristics of a transmitter used to provide a digital radio broadcasting service must comply with the spectrum mask for VHF transmitters represented by the dotted line in clause 15.4 of standard ETSI EN 300 401 V2.1.1 Radio Broadcasting Systems; Digital Audio Broadcasting (DAB) to mobile, portable and fixed receivers, issued by the European Telecommunications Standards Institute (ETSI).

 (13) If:
 (a) the DRCP that relates to a transmitter used to provide a digital radio broadcasting service; or
 (b) the DRMT licence that authorises the operation of that transmitter;
  specifies a spectrum mask (the relevant spectrum mask) other than the spectrum mask mentioned in subguideline (12), the radiated signal characteristics of that transmitter must comply with the relevant spectrum mask.
Note: Clause 15.4 of EN 300 401 V2.1.1 provides for a spectrum mask for VHF transmitters in 'critical areas for adjacent channel interference' (solid line), and a spectrum mask for transmitters in 'certain other circumstances' (dotted line).  The ACMA may specify in a DRCP or DRMT licence where a requirement exists to apply the spectrum mask