[Milsurplus] SCR-183 in Curtis A-12 Aircraft

[C.Whitaker]

de WB2CPN
To me that BFO method is very interesting.  I had never heard of
the idea of putting a variable oscillator in front of the receiver, and
tuning it near the incoming signal to get a CW tone.   But that's
exactly what we did when we were experimenting with copying
frequency-shift fax signals on RBP-2 receivers.  We used a BC-221
as the oscillator.  We achieved better audio fidelity that way. 
USAF Andrews AFB  1950  Copying Tokyo.   Army and Navy
had all the good frequencies, but they'd been in that line of work
for years and years before we even existed.   About the RBP-2,
they were the only receiver I ever saw that had a built-in variable
frequency audio oscillator that was keyed on/off by the incoming
RF CW signal, and then sent to the radio operators.  Was this
someone's idea of multiplexing the landline?   Where they big?  They
had a little step near the bottom of the rack so that we could reach
up to where the antenna connectors were.   Not many RBP-2 made
it to ham shacks, but I may have a couple of tuning capacitors with
knobs around here someplace.  (Yes, we stole the RBP-2 from
the Navy at Cheltenham.)
73  Clete