Here are a couple of photos of an ATR 11A for reference. This one is a 1944 product from RCA. The four dials are for tuning the Receiver, Transmitter, Antenna Coupling and Antenna Tuner and each has provision for locking in two complete sets of frequencies. Frequency range was 2.5 to 6.0 MCycles.
Power came from it's stand alone 24V Remote Dynamotor and a Remote Control Box was typically installed in the Pilot's location.
These may have been the sets the RCAF Harvard fleet was upgraded to after the war.
David
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