[k3] Audio distortion on strong CW signals - after a while

Posted by Pete Smith N4ZR on Jan 23, 2011; 4:05pm
URL: http://elecraft.85.s1.nabble.com/k3-Audio-distortion-on-strong-CW-signals-after-a-while-tp5952957.html

This is something I have noticed in contests recently, and just now in a
qso with a strong local - after a few minutes, the audio becomes
distorted, what we used to call a T7 note.

I have read about distortion caused by banging up against the audio
limiter, but this happens even at very low audio output.  I also have
the impression that it does not occur when I first turn on the radio,
and that when I'm transmitting a lot, in contests, it starts to happen
earlier and earlier, sometimes emerging at the end of a brief contest QSO.

Amp or no, makes no difference, and it appears to happen on all bands.

Any ideas?

--
73, Pete N4ZR

The World Contest Station Database, updated daily at www.conteststations.com
The Reverse Beacon Network at http://reversebeacon.net, blog at reversebeacon.blogspot.com,
spots at telnet.reversebeacon.net, port 7000


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