Hi Don,
I don't have a signal generator but a 4 channel digital scope.
I could buy a cheap QRP PIXIE as signal source or? use the marker signal and feed it back into the RX socket.
I've now measured the whole signal path and at least from a DC point of view the signal goes from the RX Antenna to the IF choke.
The resistance is about 1.5 ohm going from RX socket -> ATT SW -> Choke.
I will now use my scope to see what's going on RF wise ...
