"Jim" wrote in message
...

Difficult to find any information on the frequencies, but they are
supposed to be on 1.880 to 1.900 GHz in the former UK, but you could also
try 2.010 to 2.025 GHz. Modulation is GFSK.

thanks Jim, I tried a scan between 2.010 to 2.025 GHz and did pick up a hiss on
2023.4000MHz WFM but as yet have not identified what it was.