[Elecraft] Mic Noise

[Don Wilhelm]

Buck,

I would suggest that you not worry about the noise burst until you can 
get a good response out of the mic.
If you do not have a computer mic handy, borrow one and plug it into the 
rear panel mic jack.  See if you can obtain a response on the ALC meter 
with that microphone.  All computer type microphones need bias.  Buy one 
if you must - they can be had for just a few dollars (less than what the 
frustration is costing you).

If the rear mic jack works, then your problem may be the DSP board to 
Front Panel connector mating that I mentioned.

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?
>