Can anyone shed any light on this please? I have connected tx and rx audio from/to the computer via isolation transformers on both audio in and out. Rx works fine.
However, I have hit a problem trying to get acceptable transmit audio quality. I have the K2 stripped back to 10W at the moment so am not using my external KPA100 in order to remove that from the equation. I am feeding the audio from the computer via the isolating transformer straight to the microphone header with the microphone removed. I have turned the compressor off in all modes. I have no ALC showing and have tried the power control in various positions. The audio is extremely rough with various artifacts spreading widely above and below the tx frequency. I have the K2 feeding into a 100W Bird dummy load. I have listened both with my K1 with a few inches of wire as an antenna and my TS-480HX in the car parked outside. Same grotty received audio. I have checked the carrier balance on the ssb board. Although still audible in the K1¹s receiver I have minimised it for usb and lsb. I note that I can eliminate it almost altogether for lsb, but then the level at usb is high. So it¹s a compromise as I have read it would be. I have tried both my desktop pc (a mac) and my Dell laptop (XP) - no difference. I have listened directly to the audio output from the computers it sounds right. I must have used psk31 on a dozen or more radios in the last ten years or so, but never hit this severe a problem before. Listening to my ssb speech via the HM12 microphone, it doesn¹t sound great, but yet I am using the K1 to listen to it with so that¹s not too surprising. I don¹t use ssb at all except mobile, so have had no operating experience of the K2 in this mode. I am wondering if the problem lies deeper somewhere. I have googled, but hit nothing useful. Any thoughts would be much appreciated Thanks and 73, Stephen G4SJP _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
