[Milsurplus] TCS

[WA5CAB 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
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