Posted by
Nicklas Johnson on
Apr 26, 2019; 3:15am
URL: http://elecraft.85.s1.nabble.com/K3S-Audio-buzz-on-transmit-especially-AM-tp7651148.html
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.
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