Re: R209 - BFO injection
Thanks for all the replies:
Andrew2 - Yes it is basic injection into the last IF. No AGC in CW mode - the "Volume" control becomes a manual RF/IF gain control.
Don - Mine is also a MkII. I'd be interested in how yours performs on SSB.
G6Tanuki - Yes, it took me a while to figure out the gain control rationale. Then I realised that the bog standard method of lifting up the cathodes won't work - cos there aren't any! The valve tests OK but its anode feed had drifted up from 33K to over 50K. Replacing that helped a bit. I shall have a look at the decouplers.
Keith
|