Wireless Set R1155A
1939 Developed for the RAF by Marconi's Wireless Telegraph Co and E. K. Cole Ltd together, as part of an aircraft system to handle both communications and direction finding. In a heavy bomber the complete system consisted of two R1155s (one for the radio operator and one for the navigator), a T1154 transmitter, an intercom system for the crew and three aerial systems
1940 entered service. Aluminium R1155s were used in RAF bombers, the Mosquito fighter/bomber and Coastal Command aircraft. The steel versions were used in Air-Sea rescue vessels, vehicles and ground schools.
Production was shared between Marconi, E. K. Cole, Plessey, Mullard (at the Philips Lamps factory) and EMI. The first version of the receiver was the R1155, and later variants were designated R1155A, B, C, D, E, F, L, M, and N. Approximately 80,000 R1155s were made.