Hi Pat and group, FWIW, I have just built an HF Packer Amp and have exactly the same problem with marked audio distortion on SSB when driving it with my FT 817nd. Maybe the problem isn't the K2?
I have discovered others with the same problem, but no-one with a solution to this Amp's non-linear behaviour on SSB. I was waiting to finish building my K2 to try the amp with the K2, but I suspect now that the problem is with Amp. I initially thought it was RF feedback and that the mic cord was the likely culprit. But no amount of wrapping any of the connector cables through ferrite toroids has has any influence. Audio is distorted on peaks in SSB and only when the Amp is on and running into an antenna. Distortion is much less running the Amp into a dummy load and absent running the amp in bypass. Reducing the input power makes no difference to the audio quality. I've tried running the Amp and the rig from separate power supplies and/or gel cells : makes no discernable difference. I've never had any trouble with RF feedback before, running 600W from my AL 811 into the same antenna system. If you find any clues to a solution, please let me know. Glad I bought the KPA100 for my K2! 73, John VK7JB ------------------------------------------------------------ This email was sent from Netspace Webmail: http://www.netspace.net.au ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
