[Milsurplus] Re: DFing receiver re-radiation in WW 2?

[WA5CAB at cs.com]

Jim & Group,

I recently acquired an early (1937) manual on the SCR-177 and SCR-188 that 
includes a parts list and schematic on the BC-189-A (actually the schematic says 
BC-189 and the parts list says BC-189-A, the second model).  It uses four 
39/44, three 36 and one 38 tube, tunes 150 KC to 12.5 MC with 11 plug-in coil 
sets and has an 845 KC IF.  The BC-312 and BC-314 that replaced it are I'd say 
decided improvements.  The SCR-177 manual refers the user to a manual on the 
SCR-189 and SCR-189-A for further details (and I've never come across it).  The 
only performance comments are that the receiver is "unstable and extremely 
erratic" near the IF frequency.  Duh!

In a message dated 6/28/2004 10:47:31 PM Central Daylight Time, 
antqradio at juno.com writes: 
> I stand corrected, the BC-189 does precede the BC-312, making them Signal
> Corps superhetrodynes number 1 and 2 respectively.
> 
> My reference was  "The Signal Corps: The Emergency" page 139, second
> column.  Indirect reference to the BC-189 is found on the same page at
> bottom of the first column.  Must have missed this when skim reading.  It
> is the only mention of the BC-189 that I have found so far.  The only
> receiver directly mentioned on this page is the BC-312.
> 
> Not having the BC-189 receiver, is it safe to assume that the BC-312 (and
> family) is superior in performance?  Any information out there?
> 

Robert Downs - Houston
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