[Elecraft] Rear Mike Jack Question

[N4ZR]

Egads, who knew? Clearly not me.  Of course, my K3 is relatively early, 
and I didn't download the latest manual until this year.  Thanks, Don!

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On 8/23/2020 11:30 PM, Don Wilhelm wrote:
> Pete,
>
> Go to the MIC SEL menu and tap 1 to toggle between the high gain mic 
> preamp and the low gain.
> See page 52 of a more recent manual.
>
> 73,
> Don W3FPR
>
> On 8/23/2020 9:55 PM, N4ZR wrote:
>>
>> Don, I do not have a RPL bias option under Mic Sel.  Only RPH, FPH 
>> and Line IN
>>
>> 73, Pete N4ZR
>> Check out the Reverse Beacon Network
>> at<http://reversebeacon.net>, now
>> spotting RTTY activity worldwide.
>> For spots, please use your favorite
>> "retail" DX cluster.
>> On 8/23/2020 12:41 PM, Don Wilhelm wrote:
>>> Set MIC SEL to RPL BIAS.  You do not need the high gain amp with 
>>> that mic.  It is likely producing feedback as you have it set.
>>>
>>> 73,
>>> Don W3FPR
>>>
>>> On 8/23/2020 11:56 AM, N4ZR wrote:
>>>> Recently, I began trying to use the rear microphone jack on my K3 
>>>> with my Yamaha boom mike, instead of using a stand-alone USB sound 
>>>> card and feeding the signal to the LIN IN jack.  This worked fine 
>>>> for a couple of weeks, but today when I tried it, I got very loud 
>>>> white noise driving my radio and amp essentially to full scale. I 
>>>> have MIC SEL set to RPH BIAS, which has worked in the past. Any MIC 
>>>> gain setting over 7 drives the amp to full output.  When I pull the 
>>>> mike plug out of the jack, the problem goes away.
>>>>
>