Hi Dom
When apply power the signal is spread over maybe 10Hz initially (wide band) after couple seconds it calms down and is a single signal.
I wonder if that is AGC action? It'll be a massive signal into your receiver and probably the AGC either in the receiver, or in Argo, will take a little time to adjust to it.
That's my suggestion... other than that, not sure of any other possibilities!
72/3 Hans G0UPL
