R1224A RAF WWII Receiver

General Description

This receiver model was built for the R.A.F. around l942.

The R1224, which came before this receiver was entirely different, and one would wonder why a different type number was not selected for the R1224A. There was also an R1224B, which was identical to the A version, but inluded tone injection to allow the receiver to be remotely operated on c.w.

The R1224A was designed to be used as a portable receiver for airfield and general field use. The set was manufactured by the Ferguson Radio Campany of the U.K.

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Technical Data

The set is a superheterodyne, using five 2 volt battery valves. The valves used were a little unusual in that they were quite out of date when the sets were produced. They include two ARP 12's, an FC2A, a VR21 and a VR l I 8.

The set requires 120v HT, 2v for filaments, with -3 and -9v in the bias lines.

A regenerative l.F. stage is used to produce a beat note for c.w. The set can be quite tricky to adjust. Best performance is achieved on AM with the set just about to oscillate. The dial calibration chart is located under the top cover and is illustrated.

Audio output is provided for high impedance headphones via a capacitor on the primary of the output transformer. The 600 ohm secondary winding is available for line output, but was probably utilized for American low impedance 300 ohm headphones.

The matching transmitter for this set is the T 1442.

The R1224A and T1442 were used in portable wireless stations type TGRl. These were designed to be delivered to forward airstrips in containers, under Barracuda aircraft.

The R1224A is quite a rare receiver.