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11 Conditions – interference and spurious emissions

(1) A person must not operate an amateur station if its operation causes harmful interference to radiocommunications. (2) A person must not operate an amateur station if its operation causes interference to radiocommunications due to transmissions that: (a) vary from a frequency on which the station is authorised to operate; or (b) have radio emissions as a side effect of Morse code transmission; or (c) contain harmonics; or (d) cause an emission outside the necessary bandwidth of the transmission. (3) A person must take measures that are reasonably practicable to erect, fix, place and use an amateur station in a way that avoids interference to the efficient and convenient working of other stations. (4) A person must not operate an amateur station if its radio emissions include spurious emissions that are not attenuated below the power contained within the emission’s necessary bandwidth, supplied to the antenna transmission line, by: (a) for frequencies less than 30 MHz – the lesser of: (i) 43 + 10 log (pX) dB; (ii) 50 dB; (b) for frequencies equal to or greater than 30 MHz – the lesser of: (i) 43 + 10 log (P) dB; (ii) 70 dB; (5) In paragraph (4)(b), P means the power, in watts, supplied to the antenna transmission line.