[TenTec] Interfacing David Clark Headset mic to Omni 6

[Tom Delker]

The Omni 6(+) has roughly 9v available on that pin and is sufficient to
drive the mic.  I used a 1k series resistor and a .039 uf blocking cap. 
I also put a 220mfd filter cap on the power lead in my interface box as
well as 100pf across the mic element and the mic jack on my interface
box. 

I had to run a separate shielded cable directly to the mic (the David
Clark cable is twisted pair and shares the cable with the headphone
line) to reduce rfi running a KW. 

Some of the above components may have been overkill (like the filter
cap), but at least I know there is clean DC getting to the mic element.

I played with values from .001 to 1mfd - the .039 seemed to be a good
comprimise.  The 1uf seemed to introduce some "pumping" when the RF got
stout.

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