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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