Hello Clive, Make sure that the K2 is not close (within a foot?) to stray magnetic fields from battery chargers, power supplies, lamp ballasts, and so on. These can couple right through the aluminum panels and modulate the oscillators. >I have just got my K2 up and running and am getting a Rough note on = both Rx >and Tx. It is not my 12V PSU any Ideas?. Clive Penna GM3POI Michael, AB9GV