[Elecraft] Dave Clark Microphone

[Graham Haddock]

All aircraft mikes are carbon-equivalent, irrespective of the technology
inside the microphone.  So, the mike is a two wire device, one side to 
ground,
and the hot side wants to see a resistor on the order of 560 to 1000 ohms
to a clean (quiet) source of 8 to 12 volts.  The audio, which will be fairly
high level, is taken through a DC blocking capacitor from the hot side of
the mike.

It is terminated in a three wire phone plug, but one of those is the PTT
function, which will not have a connection in the headset.

 From memory, mike hot is the tip, PTT is the ring, and ground
is the sleeve.

--- Graham

==

Don Wilhelm wrote:
> Rob,
>
> If you can tell us what the functions of 3 wires are, then we should be able
> to tell you how to connect it.
> Pure speculation tells me that one is AF, another is ground and the third
> may be either the voltage feed to the electret element or it may be the
> audio to the headphone section, or it could be a PTT wire - but that is
> strictly a guess based on my assumption of whatever might be included in the
> set of 3.  In other words, a SWAG.
>
> If the element is truly an electret type, it will likely work with the K2
> just fine.
>
> 73,
> Don W3FPR
>
>   
>> -----Original Message-----
>>
>> I have a query for the group. I am a pilot and have several Dave
>> Clark H13.4 headsets with noise-cancelling electret microphones
>> that terminate in a 3-wire connector. Can these microphones be
>> configured to work with the K2?
>> Rob
>> KC6ROC  K2 #5924 in progress
>>
>>     
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