Hi Ted
I don't know why you found the need to filter that supply. I derived mine from the V+ end of R101 (adjacent to the DDS connector) and had no troubles. Mind you, I had also 'super-cap' filtered the pre-amp's supply to kill the 'tuning clicks'. I think I had quoted my other change as from pin 7 to pin 3 - try the NPN's Collector to pin 3 rather than pin 1 - and while trying that it might be worthwhile trying to allow for CW sidetone - NPN collector to M1 (scrape a bit of resist off the track from C115?), 1k res M1 to M2 (easy enough under the board at the relay?), sidetone via resistor to M2 or U1.3. As in the Cheezels ad, "gotta be worth a crack, Nigel"?
73, Dex
