[ARC5] RAL, RBA, RBC Manuals and info needed

[WA5CAB at cs.com]

You are correct about mention of rack mounting for RBB/RBC, RBB-1/RBC-1 and 
RBB-2/RBC-2.  All three were originally supplied in a cabinet for bench or 
shelf mounting.  RBB-3/RBC-3  and RBB-5/RBC-5 are supplied in the same type 
cabinet.  RBB-4/RBC-4 and RBB-6/RBC-6 receivers are supplied in a rack mount 
cabinet NT-10350-A.  The two associated power supplies are provided with a 
rack mount panel and shelf NT-10348-A.  The presence of the "-A" suffix 
implies that the cabinets and shelves were built earlier in a slightly different 
version.  As they are not mentioned in NAVSHIPS 900,477, they must have 
been procurred on a separate contract, probably later than the equipment was.  
Which would explain the rack mount RBC-2 receiver that I once had through 
here.

The two receiver versions (NT-46147 and 46148) were made from the base 
model up through NT-46147-D and 46148-D.  The power supply (NT-20130) was made 
up through 20130-B.  Unlike the practice in most NAVSHIPS (and virtually all 
Signal Corps) manuals, the various RCA manuals on the RBB/RBC in both text 
and captions refer to the receivers as "Model RBB/RBC Rreceivers", "Power 
Unit", etc. instead of as 46147-D receiver, 20130-B power unit, etc.  They 
don't even use the set model number (i.e., RBB-4).  None of the manuals include 
a section called something like "Differences Between Models".  Aside from 
the change at RBB-1/RBC-1 S/N 1001 to the location of the BFO trimmer, I 
haven't found any explanation of what else changed between CRV-46147 and 
CRV-46147-D other than the paint color.  Change 1 to NAVSHIPS 91469 runs to 88 pages 
plus two of the four foldouts.  The only obvious change is that as some of 
you know, the original RBB/RBC-5/6 manual was missing the majority of the 
photographs, which are all included in Change 1.  But about 46 of the 88 pages 
don't have a photo on either side.  

Anyway, the final NAVHIPS manuals on each of the RBB/RBC models are as 
follows:

NAVSHIPS 900,477 dated 7 May 1945                 RBB/RBC, RBB-1/RBC-1, 
RBB-2/RBC-2
NAVSHIPS 91101  dated 1 June 1948                  RBB-3/RBC-3, RBB-4/RBC-4
NAVSHIPS 91469  dated 2 July 1951                   RBB-5/RBC-5, 
RBB-6/RBC-6
*** and Change 1    dated 16 July 1952                 ***missing photos + 
parts list (available as a reprint)
NAVSHIPS 900,747 dated 18 August 1945           CN-10563 Coupling Adapter 
(IF Output Unit)
NAVSHIPS 91449   dated 28 April 1951                CQS-10563 Coupling 
Adapter (IF Output Unit)

Some of the above comments also apply to the RBA, particularly RCA's lack 
of identification of changes.  I don't have many of the RBA manuals but here 
is a list of what I have:  If anyone has any other NAVSHIPS, please send me 
the numbers and dates.

NAVSHIPS 900,708 dated 10 July 1946               RBA-5, RBA-6
*** and Change 1 dated 22 December 1947           ***added RBA-6
*** and Temp Change 1 dated 10 May 1952          ***F.C. 3 extended 
frequency coverage down to 14.5 KC
NAVSHIPS 91319 dated 15 May 1950                  RBA-5a, RBB-2a, RBC-3a  
(25 cps power conversion)
NAVSHIPS 91559 dated 21 November 1951          RBA-7

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 05/24/2016 19:44:55 PM Central Daylight Time, 
kd5byb at gmail.com writes: 
> So...I'm a bit of an RBA, RBB, and RBC nut.  I've got a bunch of manuals 
> in my collection past the ones I've scanned and posted.  I see very few 
> technical changes between the dash number revisions.
> 
> >One rule of thumb that does apply to the RBA, RBB and RBC is that the
> >odd suffix number models are bench mount and the even ones rack mount
> >(<BLANK> being an even number). Which is why each of the NAVSHIPS
> >manuals except for the first one covers two model numbers, one bench
> >and one rack.
> 
> I'm not sure this is always the case...
> 
> 
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