Warning over out of band signals

| November 4, 2016

It has been brought to the attention of the Amateur Radio Observation Service that software commonly used by UK licensees for the production of signals in both JT65 and JT9 modes, uses a default preset frequency of 5.357MHz (JT65) or 5.359MHz (JT9) in the 5 MHz band. UK licensees are reminded that, after applying the audio offset to the AFSK signal in JT65 mode, using these presets will, in the majority of cases, cause the transmission to fall outside of the upper band edge of the UK allocation of 5.354MHz to 5.358MHz. In the case of JT9, if the default of 5.359MHz is used all transmissions will be outside of the UK allocation. Many examples of this have been noted and it is imperative that these out of band transmissions cease in order that UK licensees remain within the terms of their Amateur Radio Licence.

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