The Radar Room

The R1155 Receiver

The R1155 receiver was a versatile piece of equipment that incorporated both a communications receiver along with integrated radio direction finding circuitry. The later being useful when it was required to home in on a known transmitted signal, or obtain a compass bearing from it. The receiver was used by both the RAF in their larger aircraft and Coastal Command in their aircraft and patrol boats along with other users such as the RAAF. For Coastal Command, the direction finding was often used to locate ‘ditched’ airmen using emergency transmitters from their liferafts. Several versions of receiver were offered as options, with both steel and aluminium cases and slightly different frequency coverage.

RAAF Lancaster with R1155 receiver and T1154 transmitter

In the above image we see an earlier model R1155 receiver mounted in an RAAF (Royal Australian Air Force) Lancaster bomber in the wireless operators position.  Note the larger T1154 transmitter mounted immediately above it.

Radio direction finding LR meter in front of pilot

(above) The L-R (left-right) indicator immediately in front of the pilot right next to the compass in an Avro Lancaster bomber. This was the radio direction aid driven directly from circuitry inside the R1155 receiver. Usually two of these indicators would have been used on each aircraft. One in front of the pilot and the other in front of the wireless operator.

(right)  The R1155 receiver in this image is mounted next to the round window alongside the T1154 transmitter. This arrangement was usually used in the Short Sunderland flying boat as seen here. Note the operators morse key in front of the transmitter on the desk to the right.

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R1155 receiver in a Short Sunderland flying boat