I have moderate distortion of transmitted SSB audio from my KPA100, but ONLY on 80 meters. The distortion seems worsen and improve from time to time, with no apparent reason, and tapping components doesn't give a clue. Listening on a nearby receiver, and transmitting into a dummy load on 80 meters, the audio consistently sounds fine with the KPA100 off (at 10 W and less), but is distorted with KPA100 on (at 11W and higher). The distortion is particularly noticeable at the start of a new syllable, which sound like a loud crack. A constant amplitude, like a tuning fork by the microphone, sounds fine, so I suspect the TR switch or ALC. My build is Rev 3, Jan. 18, 2007. Searching the archives, I've found the usual causes, but the fixes are already included on my build: C31 is .22 mF, and R33 (1K) parallels RC3. I tried changing R4 from 100K to about 39K, but it didn't help. Any ideas? Dick, K0KK -- View this message in context: http://n2.nabble.com/K2-KPA100-transmitted-audio-distortion-80-meters-tp3929842p3929842.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected]
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