[Milsurplus] BC-221-J

[WA5CAB at cs.com]

Rick,

What you have is a BC-221-J (hopefully the matched serial number calibration 
book was also transferred - otherwise it isn't usable as a freq meter) that 
was converted to TS-164/AR.  The original metal (in this case) cabinet with room 
in the lower rear for dry batteries or Rectifier Power Supply RA-133-(*) was 
discarded during the conversion.  

The Jones plug is for a power cable that ran to PL-103 on the adjacent 
BC-348, from which power was drawn (both A+ and B+).  There is a B+ voltage dropping 
circuit and a filament voltage dropping resistor in the small compartment on 
the rear of the CS-182/AR.  That may be what you see that lead you to say 
someone had started building an AC supply.

So the answer to both of your questions is "no".

In a message dated 3/19/2006 11:46:13 AM Central Standard Time, 
rickbras at airmail.net writes: 
> I'm confused (like that's big news) about my BC-221-J.  Some one had 
> started to build an AC supply for it or so it appears.  However, there 
> is no room for a transformer in the back.  The specifics on this meter are:
> 
> TS-164/AR
> BC-221-J
> CS-182/AR (metal case)
> 
> If this used batteries they were very small for that era and flat.  
> There is a 4 pin Jones type male socket on the right rear of the case as 
> you're looking at the front.  It is original, I'm sure.  There's a 
> harness going from this plug to the rear compartment.  There is a 
> bathtub capacitor attached in the back compartment which seems to be 
> original.  The harness runs through the metal divider between the front 
> and rear compartments.
> 
> Did this unit ever use batteries mounted inside the case or is the Jones 
> connector there to connect an external battery pack or AC supply?  I 
> have a couple of manuals (TM 11-300 and AN 08-40SCR211-2) but neither 
> show pictures of this specific model.
> 
> 

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