[Milsurplus] R-584

[Mike Morrow]

>I've never actually had any of the receivers so I can't comment on the 
>legibility of the nomenclature on the nameplate, although the one closeup photo is 
>the manual is clear enough.  But it is R-584/MRC-20.

That clears that issue up.  Just about all web references to the AN/MRC-20 cite "R-589/MRC-20."  Hard to believe internet info is sometimes inaccurate!

I assume that the R-584 retained the DM-28 dynamotor.

Were there any other modifications or versions of the BC-348-series that received a JAN nomenclature, other than the generic "AN/ARR-11" and "AN/ARC-8" that applied (in documentation only) to late models? 

>According to the manual, R-584 is a modified BC-348-Q OR BC-348-R.  The 
>for-sure way (because some of the other differences were often ham-hacked) to ID 
>the parent receiver is to look at the BFO coil.

For diffentiating between a R or Q, I just say "some grid-cap tubes" (R-model) vs. "no grid-cap tubes" (Q-model).

>Modifications to convert the BC-348 to R-584 consist of the addition of an 
>outboard (mounted on top of the cabinet) Squelch and Noise Limiter module.  The 
>module is connected to the receiver through an AN connector installed at the 
>left end of the front panel.

Are there any tubes in the external module?  Will the basic receiver still function if the module connector is pulled?

Do you offer a manual for the AN/MRC-20?  It sounds interesting.

73,
Mike / KK5F