Maybe you need to try a throat mic.

"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?