AN/APR-1 Countermeasures Receiver


Essentially identical to the AN/APR-4, with only minor differences like a variable IF gain control versus discreet calibrated steps, this unit was most often used by Navy patrol aircraft. It formed a bridge between the Signal Corps SCR-587 and Navy ARC-1 with roughly the same capability, but later tuning units (with -B suffixes like the one in the photo below) added a much needed scanning motor to sweep between two preset frequencies.


AN/APR-1 with TN-1B/APR-1 tuning unit