[Elecraft] K3 Microphone Connection

[Joe Subich, W4TV]

> I installed a DVK this morning and now the microphone connector in
> the front of my K3 does not work. Per Elecraft it has something to
> do with the DSP Board.

You prbably reinstalled the DSP board incorrectly. If installing a DVK
in the K3/K3S disabled the front panel microphone jack there would have
been much howling and gnashing of teeth on this list for years.

> Of course if I connect the microphone to the rear jack it bypasses
> the DSP board.

Not true.  Both mic sources are processed by the same DSP circuits.
The rear mic jack audio is routed from the KIO3 (P76/J76) to the
AF DSP (P50/J50).  The front mic is routed from the mic jack to the
AF DSP via P32/J32.  On the DSP board, audio from each microphone
passes through its own buffer/preamp and the desired mic elected
in U4.

If the front mic does not work after installing the DVK, and resetting
the mic selection (and bias) does not fix the issue, the most likely
cause is improper (re)installation of the DSP board - either bent or 
misaligned pins on P50/J50.

73,

   ... Joe, W4TV


On 9/4/2015 11:30 PM, pastormg2 at verizon.net wrote:
> Good Evening, I have a Heil HM-12 and what like to connect the
> microphone to the K3 Microphone connection in the rear of the radio.
> It would be a XLR 4 to a 1/8" mini plug. I don't know if Heil even
> makes such a cable.  From what I hear most headsets that heil
> manufactures has a 1/8" mini plug at the end of the cable.  I
> installed a DVK this morning and now the microphone connector in the
> front of my K3 does not work. Per Elecraft it has something to do
> with the DSP Board. Of course if I connect the microphone to the rear
> jack it bypasses the DSP board. Any suggestions, would much
> appreciated. Mark Griffin, KB3Z
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