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Receiver Type R1155A, by Air Ministry, c. 1942
Inventory Number: 80256
Number of documents: 2
Document Type: Miscellaneous Note
Document Heading: Technical Details
Text:
Receiver has 10 valves of which 3 are for the Direction-Finding (D/F) and one is a Tuning Indicator (magic eye). There are 6 used for the superheterodyne receiver. The receiver has an RF stage, a mixer/oscillator, two IF stages, an AVC and BFO stage, a detector, an audio amplifier, and a magic eye tuning indicator. The D/F circuitry has two valves as aerial switching and multivibrator, and a meter switch. It can have 3 aerials, a fixed wire type, a trailing aerial, and a D/F loop. It has 11 controls of which 5 are for D/F only.
Document Type: Miscellaneous Note
Document Heading: Historical Background
Text:
The Type R1155 Receiver was based on a Marconi design from the 1930s and modified for RAF bomber and Coastal Command operations. This first entered operational use in 1940 and more than 80,000 equipment sets were manufactured during the war years. The various designs were spread to five other radio firms, including Ekco, Plessy, Philips, and the Gramophone Co. (EMI), but were overseen by the Marconi Company. The R1155 was a combined communication and direction-finding receiver; it was commonly used with the T1154 Transmitter, which provided a number of spot frequencies. It was provided with a headphones output only and was powered externally by the aircraft electrical systems. The equipment continued in service on many civil aircraft, and the receiver was popular with radio enthusiasts & hams after the war.
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