The Radar Room

TYPE 76 RECEIVER

Fairey Barracuda

Fairey Barracuda

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The Type 76 receiver formed part of the ‘4 square’ radio system used in several aircraft, primarily the Fairey Barracuda and Fairey Firefly. When all four matching units were mounted together it made a square - hence the term ‘4 square’. There were two receivers, the Type 76 seen below, along with the Type 78. The 76 operated on two bands from 150 Metres to 505 Metres. The Type 78 from 2.4 to 13 MHz. The outputs of both receivers then

Type 76 receiver

Type 76 receiver along with the transmitters aerial matching unit

went to the modulator, which housed the IF and audio stages.

Type 78 receiver and matching transmitter

Type 78 receiver with matching transmitter

Because we do not own a modulator unit, we’ve had to build a unit from scratch to the non-standard 560 KHz IF frequency. The Receiver Type 76 itself performs well, though there is virtually nothing interesting being transmitted on these bands at the moment. Of course there are are the regular Navtex weather broadcasts to be heard on 518 and 490 KHz, but these hardly make for interesting listening as they are transmitted in binary frequency shift keying!

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