"Peter Thornton" wrote in message
...
I have the unusual need to decrease the sensitivity of my headset mike.
The
aircraft I fly has a very noisy cockpit (tube and fabric two stroke
pusher )
when I transmit the mike picks up alot of background noise. The headset
is
an avcom ac900 flex boom ,mike is an M71 I tried a mike from a DC headset
it
was better but still not great. Is there anything I can do to reduce the
sensitivity of the mike?

It's not so much the sensitivity as the noise canceling properties. Well
designed noise canceling microphones have inlets on the "lip" side of the
mike and matching inlets on the "front" side. The circuitry filters the
one-sided voice input from the "lip" side and uses that to transmit. The
noise that comes in both sides is thrown in the trash.

I'm not explaining this well, nor could I describe the circuit - but it
works. Pull the foam wind-noise muffler off your mike and see if there are
slits on both the front and back of the plastic housing. If there are, it
should be a noise canceling design. If not - look for another unit.

Rich "Talking out of one side of my mouth" S.