I'm trying to track down a pretty obnoxious audio problem on AM, and to a much lesser extent on SSB.
On transmit I get an audio buzz with the highest spikes on 350, 470, and 830 Hz. At first I thought I had a ground loop hum, so I disconnected everything from the K3s except the antenna and switched the power over to battery only. It made no difference. Other things that don't make any difference: lowering the mic/line input level to 0, changing the mic input among front panel, rear panel, line-in, changing frequency, changing output power all the way down to 0.1w, turning off all the lights and shutting off any other nearby equipment in the room, running into a dummy load with the receiver nearby. Physically touching the case or grabbing the barrel of the front panel mic connector actually does cause the buzz to get just a little softer. I generally use solar/battery power, though my ground is bonded to my utility ground. Any other ideas? I'm running out of them. Nick -- *N6OL* Saying something doesn't make it true. Belief in something doesn't make it real. And if you have to lie to support a position, that position is not worth supporting. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
