[ARC5] Carbon Mic Replacements

[Mark K3MSB]

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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