Oregon Armories

What is wrong with my David Clark headset?

I have a brand new David Clark 10-76 headset. I also have a brand new military to general aviation adapter. I can hear fine at talk to other people in the plane fine, but when I contact tower, ground, or a unicom frequency, I hear a high pitched sound being emitted. What might be the problem? Thanks in advance.
Yes I have tried it on many planes, old as one from the 70′s (ish) and as new as a skyhawk from 2008.

That’s the problem with using military headsets on general aviation aircraft. You have an impedance mismatch. Military aircraft use low-impedance mics (5 ohms) and speakers (10 ohms) and GA aircraft use higher-impediance mics (50 ohms) and speakers (150 ohms). There is a conversion kit that replaces the mic and has the adapter cable to use this headset in a GA application.

http://www.mypilotstore.com/mypilotstore/sep/5286

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