[Milsurplus] M1mod on BC453

[David Stinson]

Respectfully suggest a trick of memory.
"Circle M" are one=of=a=kind Aircraft Radio
Corporation production
samples- the first of a product off the line-
which were stored in
A.R.C.'s "Morgue."  They are unique and extremely
rare.  I own both
the BC-454 and BC-455 examples.  
The stabilizing modification was applied to
AN/ARC-5 R-** receivers
and was denoted with a mark of "Circle S."  The
stabilizing modifications
were never officially applied to the Signal Corps
BC- series sets.
Kindly,
David S.


-----Original Message-----
From: milsurplus-bounces at mailman.qth.net
[mailto:milsurplus-bounces at mailman.qth.net] On
Behalf Of Ralph Cameron
Subject: [Milsurplus] M1mod on BC453

Fifty years ago I bought a couple of command
receivers, BC454 and BC455 and both 
had the letter "M" stamped in yellow paint with a
yellow circle around them. At 
the time they were being sold brand new surplus as
being specially stabilized for 
monitoring purposes(hence the "M"). I was told
that several caps in the oscillator 
circuit were selected  to reduce drift. They
worked out of the box when proper 
power was supplied. Maybe another rumor.

73
Ralph
VE3BBM




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