[R-390] Good brief USN intro to the R-390A for first time users

[Henry Mei'l's]

My soft-cover manual/book,
RADIOMAN 1&C NAVY TRAINING COURSE NAVPERS 10229-C, Second edition, 1963
pages 121-123, including a fold-out block diagram,
gives a concise oveview of the the receiver

Henry

OZ3O N2NR