PRR-9

 This crystal controlled receiver is designed to clip onto the operators helmet.
The PRT-4 is the matching transmitter.

COMMENTARY

Built in the late sixties, the PRR-9 is a single channel crystal controlled VHF FM receiver, designed to operate in conjunction with the PRT-4 transmitter. Both transmitter and receiver are battery operated and are designed to clip onto the operator's helmet.

Audio is received either by the audio horn that directs sound towards the operator's ear, or a headset may be used. The receiver has a single control, the volume pot which doubles as on/off switch and the squelch control.

I know of several people who have successfully operated this equipment. Only one battery voltage is needed to operate the equipment.

TECHNICAL SPECIFICATIONS

Frequency Range:    47-57MHz single channel
Mode:    FM
Receiver type:    Dual conversion Superheterodyne.
Battery Type:    BA-4534 6 Volt

CONSTRUCTION

Below: Internals of the PRR-9. There is nothing particularly eye-opening about the electronics. This radio is cheap and functional.

OVERALL RATINGS

    Engineering rating (taking into time of design).

             This radio wasn't designed to be an engineering masterpiece. It was meant to be cheap yet functional. Basically a throw away radio 6.5/10

    Fitness for purpose rating

            Perfect to be used by army grunts. 10/10

    Usefulness as ham equipment rating

             Single channel only. 8/10.

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