[ARC5] Carbon Mic Replacements

[Michael Clarson]

Another option. Motorola made a carbon mic replacement which they used on
almost all their 2-way radios. At a hamfest, look for PLASTIC cased
Motorola microphones (metal cased ones, known as "The Toothbreaker" may be
carbon mics), either beige and grey, or a light grey. Inside you'll find a
sealed dynamic mic and preamp assembly.that replaces a carbon element. It
is polarity sensitive, and I do not know the voltage range, but they should
be quite reasonably priced. WARNING: Many of these have a connector that
looks just like the standard Amphenol 4 pin microphone connector. It is
not. The key slot is in a different place. If you want to use one as is,
pick up a control head for the mating connector.. Also, the wire inside the
cable is almost impossible to solder to. --Mike, WV2ZOW

On Thu, Mar 24, 2016 at 9:14 PM, Mark K3MSB <mark.k3msb at gmail.com> wrote:

> Hi All
>
> I want to start using my SCR-274N on AM and have been looking for ways to
> use non Carbon Mic with the BC-456 modulator.
>
> There was a potentially interesting solution about this on an old QRZ.com
> post:
>
>
> http://forums.qrz.com/index.php?threads/carbon-mic-replacement-for-mily-transmitters.443437/
>
> with the schematic (no documentation) listed here:
>
> http://forums.qrz.com/index.php?attachments/img312-jpg.190336/
>
> I went to the ER Web site and there doesn't seem to be relevant article in
> the August 1990 issue.  Does anyone have this issue to verify?
>
> I was also looking at back issues of ER and the only two related articles
> I found were:
>
> January/1992  Microphone Replacement, TCS Carbon by (Mike?) Murphy.
>
> March/2008  Regular Mic preamp for Carbon-Mic-Only Transmittters by
> Heidelman.
>
> I don't have any of these back issue in my collection, and I'd be
> interested in know if any of those articles provide a suitable solution to
> using a non carbon mic.
>
> 73 Mark K3MSB
>
>
>
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