[Elecraft] Mic Noise

[Bob McGraw K4TAX]

By chance is MIC + LIN set to the ON mode in the MENU?   Should be OFF 
for just microphone usage.

I agree with Don.  Disconnect everything except the power cables, 
antenna coax and microphone.

73

Bob, K4TAX

On 3/17/2019 11:22 AM, Don Wilhelm wrote:
> 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?
>>
>
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