[Elecraft] K3: Problem with CM-500 plugged into front panel through AD1K

[Joe Subich, W4TV]

Use an Ohm meter and see if pin of the Foster plug is connected
to the center pin of the 3.5mm jack on the AD1-K (DC connection).
It is entirely possible that the adapter has a blocking capacitor
as the AD1-K was designed for use with Heil's dynamic microphones
which do not want DC on the mic element.

73,

    ... Joe, W4TV


On 1/21/2014 4:14 PM, Stan Rowe wrote:
> Does anyone have any ideas why my Yamaha CM-500 microphone won't work when
> plugged into the front of the K3.  I am using the Kenwood AD1K adapter and I
> have the firmware set to select the front panel, low gain, with bias on
> (FP.L bIAS).  The CM-500 headphones are plugged into the Phones jack on the
> front of the K3 and work fine.  The CM-500 mic plug (grey) is plugged into
> the corresponding jack on the AD1K.   When I press my footswitch, the K3
> goes into transmit but there is no audio when I speak into the CM-500's
> microphone.  I have tried the footswitch plugged in both on the back of the
> K3 and into the AD1K footswitch jack and it works fine (puts the K3 into
> transit) in both cases.
>
>
>
> When plugged into the rear Phone and Mic jacks on the K3, the CM-500 works
> like it should.  In that case I have the firmware set to RP.L bIAS.and both
> the CM-500 microphone and headphones work fine, so I'm quite sure the CM-500
> is not the culprit.
>
>
>
> It almost seems like the AD1K is the problem.
>
>
>
> This must be something simple, but I am stuck.  Any suggestions much
> appreciated.
>
> Thanks
>
> Stan - K6VWE
>
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