[ARC5] Carbon mic replacements

[Scott Robinson]

OD paint...?

/scott

On 3/25/16 8:55 AM, Dennis DuValll via ARC5 wrote:
> Yes, the Motorola and other microphones mentioned work very well.  But
> they don’t look military….  :^(
>
> Dennis D.  W7QHO
> Glendale, CA
>
> ****************
>
>
>> On Mar 25, 2016, at 8:17 AM, Robert Nickels <ranickel at comcast.net
>> <mailto: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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