[ARC5] SCR-183 coil sets

[WA5CAB at cs.com]

Group,

I recently acquired TM 11-200, which I've been looking for over the past 20 
odd years.  But haven't yet read through it in detail.  However, Jack's comment 
about having a copy of two pages out of it that mention a crystal control 
coil unit prompted me to dig through it specifically looking for that.

SCR-AF-183 included or maybe was available with Transmitting Coil Set C-182, 
4000 - 5000 KC, supplied with a DC-10 crystal on 4495 KC.

SCR-AG, AH, AJ, AK, AL & AN included or was available with C-184, otherwise 
with the same specs as C-182.  

This is all in the basic TM, not a Change or Addendum.  Tuning instructions 
are given.  Interestingly (or strangely), the tuning indication used is the 
modulator plate current (because the modulator grid bias is derived from the 
finals).

In a message dated 12/13/2006 8:12:52 PM Central Standard Time, 
kk5f at earthlink.net writes: 
> Jack wrote:
> 
> >I have one of these crystal controlled coil sets,
> >the designation is C-184. It has a DC-10 holder
> >which is held in place by two small Dzus fasteners
> >just as Jay described. The frequency is 4495. 
> 
> Interesting!  I never heard of such a unit until Jay described one, nor read 
> of one in any of several versions of SCR-*-183 manual.  Are the units that 
> you know about documented in the "normal" issue of the set manual, or is it 
> documented in some type of later addendum to the manual?  Was there an earlier 
> version of the C-184 or C-182 coil that was not crystal-equiped?  
> 
> It almost sounds like an ad hoc alteration of some sort, like the 
> crystal-controlled (!) RT-91/ARC-2 that I came across 30 years ago.
> 

Robert Downs - Houston
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