Steve - I believe the answer to your question, "Can the Heil GM-4 work
with the 10k hooked up from AF to 5V?" is yes. The Heil Icom cables for
the GM microphones have a capacitor that isolates the 5V from the GM
microphone element.
See the description of the Icom setup on the Heil web site ->
http://www.heilsound.com/amateur/tips/all_icom.htm
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