I was giving my Delta II a "check-out" this weekend, and noticed an issue with
the RX audio.
The best way I can describe it is that it sounds like "de-sense" or strong
adjacent signal overload... the received signal sounds fine, and then
suddenly goes garbled, almost like I hit "rev sideband". There is no change in
s-meter or background noise levels. It comes and goes. When it happened the
first few times, I searched for the strong station, but none is there (and then
I verified there was none on another rig, switching it out A/B on the same
station). It also seems to be somewhat sensitive to mechanical "shock" -- I
can gently tap the rig, and sometimes get it to come back.
I am going to go through and exercise all the inter-board connectors (the Delta
II has a lot of them), and put some deoxit in the pots. Any other simple things
I should look at, or boards I should focus on in the audio or mixer chain? I
ran a bunch of QSO's in the contest this weekend, and a couple of longer QSO's,
and there were no comments on transmit audio issues -- appears to be RX only.
Ideas?
Bill W1PA
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