Once again great and prompt support from both the Elecraft list as well as
microHAM. Thank you all!
Executing W4TV's advice solved the problem:
Elecraft connect pin 7 (mic ground) and pin 8 (PTT ground) in
parallel and use a single RF choke to ground. This causes a
"pin 1" common mode RFI problem because PTT and microphone
circuits are "mixed."
A single cut gave me pristine audio in the monitor and on the air as
confirmed by a local volunteer. Settings now:
MIC GAIN = 30, COMP = 20, TX EQ 0.05=+6, 0.10 = +4, 0.20 = +2, 1.60 = +2,
2.40 = +4, 3.20 = +6. I might tweak the EQ some more later.
TNX again y'all!
- Franki ON5ZO = OQ5M
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