RSGB confirms some British JT65/JT9 5 MHz signals out of band

Looks like my last post has had an effect……..

From RSGB News today

“Keep legal on 5MHz

The RSGB Amateur Radio Observation Service has noted several examples of
British JT65 and JT9 mode transmissions straying outside of the UK
allocated band slots.

It is understood that software commonly used by UK licensees for the
production of signals in both modes uses default 5MHz band preset
frequencies of 5.357MHz for JT65 or 5.359MHz for JT9.
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 then all
transmissions will be outside of the UK allocation.

Users of these modes are requested to check that their transmissions
fall within the allocated spectrum.”

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