On Sat,8/23/2014 6:32 PM, Bob McGraw - K4TAX wrote:
As to using a headset type mike, the proper values resistors and a DC
coupling capacitor will be needed.
Off list, to avoid confusing the natives. Bob, I really question the
need for anything more than a single resistor on the order of 5K from V+
to the high mic lead. The single resistor works fine with the vast
majority of unbalanced electret mics, and since electret mics have been
really common with ham rigs for at least 20 years, I can't imagine a
modern rig whose mic input isn't DC blocked.
As to VOX operation -- while I agree that electret mics tend to be
hotter, a designer would have to be pretty dumb to put the VOX gain
takeoff BEFORE the mic gain. Have you encountered rigs where this was
done?
73, Jim K9YC
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