[Milsurplus] Question

[Hubert Miller]

That's what immediately came to mind, and i believe i saw the same in Bowfin
at Honolulu. 
The RBS and practically identical RBM-hf   ( 46277 ) are neat looking and
very nicely assembled, as they should be for the approx $1000 Uncle Sam paid
for them.

The downside is the fast tuning rate and selectivity with the 1240 kHz IF.
Selectivity is two step, wide and wider. Both tuning rate and selectivity
are worse than

with the BC-348.

I think it's a shame the tuning rate is so high. I admire that use of a 6SJ7
mixer instead of the noisier 6SA7 that the BC-348 uses. 

The selectivity can possibly be handled with a Q-mulitiplier, possibly using
the dial dimmer light hole, altho once

you have played with the dial dimmer, it's a real fun accessory to have, and
you can dial in just the most pleasing dial illumination. 

I didn't know the "big power supply" with the audio amp in it is rare, but
that may be true. I have seen two out here. I think when John Nelson and i
shopped at the

ship conversion place at Lake Union, Seattle, i chose the small RBM supply
and he took the big RBS supply. All the RBM/RBS/ and power supplies worked 

perfectly, 50 years after their last use.

-H M

 

Sent: Monday, August 22, 2016 11:19 PM

Subject: Re: [Milsurplus] Question

 

Floyd,

 

Class 42 was not specified or used.  Most likely, the receiver was a
CCT-46217, part of Model RBS and RBS-1.  Covers 2-20 MC A1/A2/A3.  In the
photo, it should have been mounted vertically to a bulkhead in a CCT-10227
rack and cabinet, with a CCT-20235 or 20235-A Rectifier Power-Amplifier
hanging from the bottom of the cabinet.  If it was a 10227-B, it should have
been mounted on a shelf or open bench with CCT-20235-B hanging below.

 

Electrically and mechanically the same as CCT-46077 or 46077-A (HF receivers
of RBM through RBM-5) except that four of the control knobs have large
white-filled letters engraved on them.

 

Performance wise, it was pretty good for its day, roughly equivalent to
BC-342 or BC-348 performance wise.  Two RF, two IF, AVC, ANL, three AF
stages.

 

Today, I would class it as "Uncommon".  The Rectifier Power-Amplifier is
probably Rare.  I've heard of two or three but never saw one.

 

Robert Downs - Houston

wa5cab dot com (Web Store)

MVPA 9480

 

 

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