[Elecraft] Rear Mike Jack Question

[Nr4c]

A CM-500 does not need RPH bias mic settings it is a high output element and RPL bias will do fine with mic gain beteeen 10-20 (I use 17). 

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...nr4c. bill


> On Aug 23, 2020, at 1:19 PM, Dave Erickson <radio at disseminator.net> wrote:
> 
> This just happened to me. I heard a screeching whine when hitting transmit in ft8, turns out the recent update reset all my sound assignments.
> 
> 73
> 
>> On 8/23/2020 11:01 AM, Buck wrote:
>> I would suspect a Windoze update scrambled your sound assignments.  Go back and check all your settings.
>> 
>> k4ia, Buck
>> K3s# 11497
>> Honor Roll  8B DXCC
>> EasyWayHamBooks.com
>> 
>>> 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.
>>> 
>>> Have I inadvertently messed up another setting, or perhaps a failure in the mike?
>>> 
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> 
> -- 
> Dave Erickson
> k0dom
> 73
> 
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