Fw: Re: [Milsurplus] TCS

[windy10605 at juno.com]

Yes, I wondered how those 3 tiny holes do the job with the RS-38A. The
element only has 4 tiny holes in it. Lots less than a standard telephone
element.
 
73 Kees K5BCQ
 
 
--------- Forwarded message ----------
From: WA5CAB at cs.com
To: milsurplus at mailman.qth.net
Date: Mon, 3 Jul 2006 16:04:45 EDT
Subject: Re: [Milsurplus] TCS
Message-ID: <418.439455e.31dad25d at cs.com>

The RS-38-(*) was the standard Navy handheld carbon microphone through
the 
40's and early 50's, as the T-17-(*) was with the Signal Corps. A variant
is 
also used with MAB and another variant with the TBY. There were several
different 
Navy Type Numbers, and at least two NAF numbers. The variants differed in

cordage attached and PTT switch contact configuration. But the microphone
body 
and carbon element were the same. The common one with PL-68, RS-38A, is
51004-A 
or -C. The one on the MAB is 51042. The unit with the TBY, RS-38-B or
51004-B, 
also had a larger number of larger diameter holes in the front cap.

The CAU-51006 (which is not an RS-38 variant) was used with early TBX
sets 
(and probably TBO) but I've never had but one of them. It is similar in
size and 
shape to the Signal Corps T-24, which is also quite scarce.

In a message dated 7/3/2006 2:33:06 PM Central Daylight Time, 
jmfranke at cox.net writes: 
> The RS-38 microphone was also used with the GF-11/12 aircraft
transmitters.
> 
> John WA4WDL
> 
> ----- Original Message ----- 
> From: <W7QHO at aol.com>
> To: <scottjohnson1 at cox.net>; <wf2u at starband.net>
> Cc: <windy10605 at juno.com>; <milsurplus at mailman.qth.net>
> Sent: Monday, July 03, 2006 3:17 PM
> Subject: Re: [Milsurplus] TCS
> 
> 
> 
> In a message dated 7/3/06 10:20:15 AM, scottjohnson1 at cox.net writes:
> 
> Didn't realize the RS-38 was so widely used. Have accumulated a number
of
> examples over the years and found the "working" percentage to be about
the 
> same
> as old T-17s. Thing is, the TCS didn't really have an audio chain in
the
> usual sense, just fed the mic through a transformer directly to the
> P-P 1625 grids. Same thing in the BC-441 and in both cases, unless one 
> is
> using a very hot mic, modulation is limited to around 50% at normal
speech
> levels. The BC-375 even with it's type 10 speech amp stage isn't much 
> better,
> BTW.
> 


Robert & Susan Downs - Houston
<http://www.wa5cab.com> (Web Store)
MVPA 9480
<wa5cab at cs.com> (Primary email)
<wa5cab at houston.rr.com> (Backup email)
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