[Elecraft] Mic Noise

[Don Wilhelm]

Buck,

It sounds like that noise is coming from whatever computer software 
application you are using.  You mentioned N1MM.
When you unplug the USB cable, whatever software you are using loses 
communications with the radio.
When you plug it back in, that program is not attempting to re-establish 
communications.

What applications do you have active on your computer?

I again suggest you get the microphone to work first - unplug everything 
from the K3 except the microphone, the power and the antenna 
connection.  There may be something unrelated to the microphone going 
awry, so eliminate everything except the microphone.  When that works, 
build things back up one at a time until you discover the culprit.

73,
Don W3FPR

On 3/16/2019 7:13 PM, Buck wrote:
> I've tried all the combination of mics and mic bias.  The noise 
> happens even with the mic gain turned all the way down and the rig in 
> TEST mode.  It happens when N1MM is not running.  It happens using the 
> internal DVR card.  It happens with the mic disconnected and using the 
> XMIT button on the front of the radio.
> -
> Here is a clue.  If I turn on the VOX and reduce the either the RF or 
> AF gain on the receiver, I start getting the noise about once every 
> half second.  It sounds like it starts with a "ping." Sounds like 
> something is polling the radio.
>
> If I disconnect the USB cable on the back of the radio, no noise. It 
> seemed to be properly seated.  Now, if I plug the USB cable back into 
> the radio, no noise.  Have I found the culprit?  A lose USB cable?
>