[ARC5] Carbon mic replacements

[Dennis DuValll]

Yes, the Motorola and other microphones mentioned work very well.  But they don’t look military….  :^(

Dennis D.  W7QHO
Glendale, CA

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> On Mar 25, 2016, at 8:17 AM, Robert Nickels <ranickel at comcast.net> wrote:
> 
> I'm surprised it hasn't been mentioned that for many years, Motorola and GE (and probably other) two-way FM radios used a controlled reluctance mic element with an integral transistor impedance matching stage to make it directly usable with a carbon mic input. You can probably noodle around the Repeater Builder site and find some model numbers but IIRC mics with both metal and plastic housings used this design, and they key is they all had the 4-pin connector, not the modular type, similar to the one shown opened-up here, although most are the driftwood (beige) color scheme:
> 
> http://forums.radioreference.com/motorola-forum/262809-help-needed-identifying-vintage-remote-microphone.html
> 
> The GE Progress Line was similar although the the electronics was packaged differently.  The element inside has characteristics similar to the famous Shure 444 and I've modified some of them for use as a regular hand mic with the characteristics of the 444. GE:  http://i.imgur.com/Vke2oJS.jpg
> 
> The nice thing is, these mics are usually in the "dollar apiece" boxes at hamfests.   Shure, Turner, and others also supplied their standard hand mics with carbon elements, and virtually any mic you'd find used with either an aircraft comm radio or an AM marine radio will be a carbon type.
> 
> 73, Bob W9RAN
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