[Elecraft] K3 Intermittent mic connector

[George Fenwick]

I had this problem several months ago.  It turns out the mic connector ground (both mic and PTT) goes thru a 0 ohm surface mount resistor (at one time this was a choke, I believe).  I bridged this component and the problem went away.  I believe the board flexes too much
when the mic is plugged in, and this leads to failure of the resistor.

George
W2AIV

> On Jan 29, 2014, at 17:50, Don Wilhelm <w3fpr at embarqmail.com> wrote:
> 
> Mike,
> 
> It sounds like a bad solder connection somewhere.
> Before you dig into the K3, try the mic directly on the K3.  If all is OK, then investigate the connector for the Duo to K3 cable.
> If it persists with the mic connected directly to the K3, then it may be a K3 problem.
> 
> Right now, there are too many variables - the Duo to K3 cable, the PR781 mic connector, the DUO itself, and the K3 - all can be suspect.  Eliminating the Duo will reduce the variables to 2 - the PR781 mic plug and/or the K3.
> 
> 73,
> Don W3FPR
> 
>> On 1/29/2014 12:58 PM, Mike Sanders wrote:
>> Greetings All, My K3/10F now K3/100 plus mostly loaded has a problem.
>> The mic connector has to be pressed down a bit to get PTT when using
>> the K3 on SSB. I use a Heil PR781 mic that goes through a Rigblaster Duo.
>> The connector to the K3 comes from the Duo and is never changed or
>> fooled with. Before I pull the front panel module has anyone had this
>> same issue and what was the problem? Thanks for any hints/help. 73
> 
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