@Rossco I have just jerry rigged one of these GME UHF (TX3120S) radios up and wondering if you get any hash/noise coming thru speakers on standby?
Mine is wired thru IGN / Acc and even with engine not running get this noise thru both the unit and mic speakers _ do you experience any noise (buzz) similar and if not how have you wired it up?
Running the GME aerial AE4702BTP med duty A/T (2.1/6.6DBi / twin job). I do have BT device nearby and need to do some trouble shooting.