[Elecraft] K3S Audio buzz on transmit, especially AM

[Jim Brown]

On 4/27/2019 11:31 AM, Nicklas Johnson wrote:
> To answer Jim's earlier question, yes, it does appear that transmitting an
> unmodulated AM carrier from the K3S into anything resembling an antenna
> yields a buzz on the KX3 receiver (and vice-versa).  The buzz is NOT
> audible when listening to the K3S's own TX monitor.

OK. Try this test. Running from a battery, no connection to anything 
grounded, TX into an antenna and listen on the KX3 running on internal 
batteries, also not connected to anything grounded. Do you hear buzz? If 
not, walk around until you do. If you do, walk around until it's 
loudest. What this test is doing is probing for some source of passive 
intermod. It could be in your own home, or it could be somewhere else.

And try this test. Transmit into an antenna and have someone listen to 
your signal. I see that you're only 36 miles from me, so perhaps I could 
do that on 75M if you have a suitable antenna.

I haven't seen an answer for my question about DC voltage under RX and 
TX conditions.

73, Jim K9YC