Keep in mind that the side tone comes up the anti-VOX line from the transmitter. The Anti-VOX gain is also the side tone gain. Its usual for it to require a different setting for CW than for SSB. I don't know what would result in oscillation there but the problem is probably in the transmitter. The side tone comes from the same oscillator arrangement that is used to generate the TUNE tone, it is the mic pre-amp with a feed back phase shift network.
Is your feed through with key up the same frequency as the side tone (you probably said already)? That might be a clue as to where its coming from.
In general all the VOX adjustments are differernt for CW and SSB. A bit of a PITA but all things considered one can get used to it.
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On 2/1/2024 11:20 AM, Steve Johnston via groups.io wrote:
I don't have the schematic here, but sometimes when I've had audio bleeding onto circuits where it did not belong, I found that the power line into the audio source stage had a bypass capacitor fail (go low in value with age).? It was letting audio ride on the B+ power backwards out of the audio source stage.? The audio was then able to get into another stage and be heard there (bypassing whatever was the normal switching or muting scheme).
73?? Steve? WD8DAS
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Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
