[ARC5] More on SCR-183 Coils

[David Stinson]

Finally dug out some of my docs-
and Phil:  you sent me some copies of early SCR-183
and GF/RU docs, for which I still owe you a steak dinner 
if you make it to Dallas ;-).  They have been a treasure.

April 1931-
Original "RU" designated receiver- actually an A.R.C. model "D"
battery-operated set- was tested by the Navy off San Diego, CA.
The Navy recommended purchase with changes, 
which lead to RU-1(?) and RU-2 below.

June 1932-
The Army wants in on the new A.R.C. sets and orders
SC.132311,  SCR-AA-183  Transmit/Receive set
with a single coil set for the transmitter and two sets
for the receiver.  Freq range unknown to me.
A stand-alone receiver, SCR-AA-192, was on the same order
and has six coil sets.  I have seen only one coil receiver 
coil set for this receiver, C-101 2500-4700 KC.  
Don't know the other ranges, but IIRC one of our members
has the original instruction manual for this set.
The Navy, not to be outdone....

November 1932- 
Contract NOs-29086
Original set designated "GF," which included the receiver
as a "componant" under the "GF Set" designation.
Transmit 6200-7700 KC with one half/size removable coil, 
which has only the PA and antenna coils in it.  The oscillator,
neutralizing and interstage coils are permanently installed 
in a shielded box within the transmitter.
Receive:  Two coils, 224-350 KC and 5400-8100 KC.
While I don't have an example of the receiver nomen plate,
it's likely the receiver was designated "RU-1" as a componant
under the "GF Set" contract since,
under the same contract, a "stand alone" receiver, designated
"RU-2", covered 224-12500 KC using 10 different coils.
The two receivers would require different designations
because they have differing specifications (freq coverage).

While I don't have direct information on the freq range
of the six receiver coils for -AA-183 or -AA-192,
the -AB and -AC ( order SC.132350 March 1934)
variants covered:
224-228, 400-800, 800-1600, 
1600-3000, 2500-4700, 4150-7850 KC.

Given all this, I think it likely that the quote of 150-12500 KC
for SCR-183 was rooted either in early specs and docs during 
the 1932-33 prototyping stages or confusion with coils for RU-2 
or later versions of RU.

73 DE Dave AB5S