[Elecraft] Mic Noise

[Jack Brindle]

That could be. USB and computer connections are notorious for causing problems if they are not shielded or connected properly. By unplugging and replugging the USB cable you just may have seated it properly and fixed things. Play with the radio for a while, on the air, and let us know if it actually did solve your problem.

73!
Jack, W6FB


> On Mar 16, 2019, at 4:13 PM, Buck <radiok4ia at gmail.com> 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?
> 
> k4ia, Buck
> K3# 101
> Honor Roll  8B DXCC
> EasyWayHamBooks.com
> 
> On 3/16/2019 4:43 PM, Don Wilhelm wrote:
>> Buck,
>> The Heil Goldline mic is a dynamic type, last I heard it has an HC-5 element.  It should have bias off.
>> The Elecraft MH4 is an electret type and must have bias set on - use "FP.L bias"
>> It may just be that you have too much mic gain - start with a mid-range setting.  The mic preamp can shut down if it receivers too much signal.
>> Make sure there is nothing plugged into the rear mic jack - although MIC SEL should allow you to switch from one to another.
>> If you are not successful, do you have one of the computer type microphones?  If so, plug it into the rear mic jack, set MIC SEL to "RP.L bias" and see if you get any audio.
>> Have you made any changes to the Front Panel assembly where you removed the DSP board?  If so, there is one connector between the Front Panel board and DSP board that if not mated properly will cause the front panel audio to fail.
>> The TX DLY should have nothing to do with it.  The KPA500 becomes active with very little delay.
>> 73,
>> Don W3FPR
>> On 3/16/2019 4:24 PM, Buck wrote:
>>> Thanks. I was using a Heil Goldline and also tried an Elecraft MH4 plugged in the front.  I get the same noise on FP.L and FP.H  Bias is off.  And, I still get the noise even when in TEST mode, so there is no RF.
>>> 
>>> I had the Tx Dly on the K3S set to 8.  I set it to 15 and the problem went away.  Was I hitting the amp too soon?  Amp is a KPA500.
>>> 
>>> Now the problem is back, even with the Tx Dly set to 20.
>>> 
>>> 
>>> k4ia, Buck
>>> K3# 101
>>> Honor Roll  8B DXCC
>>> EasyWayHamBooks.com
>>> 
>>> On 3/16/2019 3:41 PM, Don Wilhelm wrote:
>>>> Buck,
>>>> 
>>>> Which transceiver and which microphone?
>>>> If the K3, are you using the front panel mic jack or the jack in the back?
>>>> How do you have MIC SEL set?
>>>> 
>>>> 73,
>>>> Don W3FPR
>>>> 
>>>> On 3/16/2019 2:57 PM, Buck wrote:
>>>>> I never use a microphone so here I am today trying to run voice in the Va QSO party.
>>>>> 
>>>>> When I key the mic, I get a burst of noise that lasts maybe a half second.  It does this even if I have the rig in "test" mode ie. no transmit.  So, I don't think it is RF.
>>>>> 
>>> 
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