As far I found out via various Measurings and some Informations I got:
Pin Color Text
A red Microphone +
B green Microphone -
C n/c? not used here?
D orange Left Headphone +
E white Common Ground except Microphone
F black DC+ input for ANR circuit
G blue Right Headphone
Things I found out:
a) The Microphone is completely on its own; no ground connections to somewhere else. It seems that this needs no bias voltage?
b) The headphones work without DC input on the black wire too, but at low volume. With DC supply the sound is not hifi, but really nice.
c) DC Input works from about 12V onwards, I believe 24V and up are originally supplied in military gear.
d) The ANR works nice but tends to hum if the headset is not reassembled carefully. The hum has nothing to do with the DC input Voltage. Even on battery use with a signal generator als Sound Device hum occours.
e) The Microphone sounds a bit tinny, but I think this not the badest thing in the headsets native environment. Reports were (besides my voice sounded like through a pringles-chips-can) good.
f) You definately want to use some kind of wind blocker on the mic. Every black foam-thingy that fits on the boom mic should work.
If someone has further suggestions, it'd be great.
I hope someone else can use this.
73 es 55 Wolfgang OE5EWL