[Milsurplus] Fw: Pre-WWII Aircraft Radio Transmitters &Frequency Meters

[Kludge]

-----Original Message-----
From: milsurplus-bounces at mailman.qth.net
[mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of DeWitt Clay
> Receivers: from August 1936 Navy Aircraft Radio pamphlet
> The RU is the receiver described as standard for all aircraft. The RU-2,
RU-2A, 
> RU-3, and RU-4. The RU-2A and RU-3 are describes in detail. It further
states 
> that the RU-2A was designed for beacon instalation and is electrically
identical 
> to the RU-2. Improvements incorporated in the RU-3 include CW reception
and 
> AVC. It states the RU-4 is similar to the RU-3.

One receiver for which I have no information as to application is the RAJ
which is essentially a modified RU-3A with coil sets to cover up to 13575
KC.  Ships 242A has it listed as an aircraft receiver which is what it
wasn't.  Instead it used one of two power supplies, one a 6v dynamotor for
use in ground vehicles (cars & trucks) and the other a 115vac supply for
fixed operation.  Also, it was built for local control only so there were no
control boxes etc but rather had all the controls in a small box attached to
the front panel.  That's about the extent of my knowledge which is just
enough to be tantalizing (or frustrating, dependent on my mood) but not
*quite* all I want.  We can all identify with this problem to some degree or
another, I'm sure, but that doesn't make it any less prone to drive me
Street Rat Crazy from time to time.  Oh, wait, I already am SRC ... :-)

The RU-2 already had a BFO but it didn't have an AVC which was a major
improvement.  However, the RU-2 was also the start of the receiver line that
was vastly improved over what became the SCR-A*-183 receivers.  This is much
like the GF-2 was a major upgrade from the original design which,
unfortunately, the AAC/AAF didn't take advantage of either.  I strongly
believe that budget was a consideration here.  The Navy had deep pockets
while the Army got table scraps.  

As a kind of related side note: The evolution for the SCR-A*-183/-283 was
(in Rx/Tx order) BC-179/-180, BC-199/-200 and finally BC-229/-230 with the
24v equivalent BC-429/-430.  I think there was one other receiver in there
but I can't remember right off.  Each was a minor improvement over the
previous version but none came close to what the Navy had and they were all
based on the original design as used in the Navy GF.  (GF, at the time,
referred to both Rx and Tx with the receiver portion used by itself being
the RU.)  

Oh, well, enough diversion for the moment.

Best regards,
 
Michael, WH7HG ex-K3MXO, ex-KN3MXO, WPE3ARS, BL01xh ex-Mensa A&P PP BGI 
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