I just listened to the 0100Z ARRL bulletins on 14.0475 and 7.... and 3.5
and I could hear no chip, whoop, bloop or poop. A harsh leading edge on
all probable comes from running in fast QSK mode clipping the leading
edge in the PA. I tried listening with a beat note under a couple
hundred HZ to emphasize and frequency chirp. I didn't hear a think but
that thud at the beginning. I think that thump is exciting the resonant
case of your Tentec power supply. I'm listening with a Corsair II with
SSB or CW filter and a Motorola Motrac era two way speaker in a metal
case. I find this speaker superior to most other communications speakers
including more modern Motorola speakers. Sounded like a pretty stable
transmitter to me, nothing but that thud at the beginning of each dot or
dash to complain about.
I didn't detect a difference on 80 or 40, same harsh make.
73, Jerry, K0CQ
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