[TenTec] MIKE & Eagle

[Jim Brown]

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