Receiver R1082

The R1082 is a general purpose airborne HF receiver designed in the mid 1930s by STC. It was used together with the companion transmitter T1083 in early versions of light and heavy bombers including Fairey Swordfish and Battle, Handley Page Hampden, Armstrong Whitworth Whitley, Vickers Wellington and the Short Stirling. The R1082 was replaced by the R1155 in the beginning of the 1940s but continued in use in some cases until the late 1950s.

At the outbreak of the war in 1939, the R1082 was one of the main receivers used by Royal Air Force, in spite of its technology being all but obsolete at that time. They were also used in air-sea rescue launches and after being phased out of the aircraft they were used for ground communication.

Receiver Data
The R1082 is a simple regenerative receiver (TRF) with 5 valves plus a protective diode across the antenna input. The first stage is an RF amplifier pentode, followed by a triode detector with positive feedback, two AF amplifier triodes and another triode as AF output stage for headphones. The equipment also provides intercommunication for the crew.

The receiver covers 111KHz to 500KHz plus 3MHz to 15MHz in 14 bands with interchangeable coils, and it can be used for CW and R/T. The coils come in pairs, aerial (input) coil and anode coil for the RF stage. For full frequency coverage there are 28 coils in a special carrying case. The lower frequency bands can be used for D/F (direction finding), using a D/F add-on and a loop aerial. The receiver is constructed on a metal front panel to which all the circuits are mounted, the receiver case is of wood.
 

The receiver is a two-hand device with one hand on the tuning knob and the other on the feedback knob, and it needs a skilled operator to do a good job. The dial is only marked 0-100, and the operators made their own calibration charts for each individual receiver they used. The positive feedback is inductively coupled from the detector output to the RF anode coil. The degree of feedback is regulated with a potentiometer changing the RF gain. Close to the self oscillation point the positive feedback gives high gain. The receiver sensitivity is quoted as 25uV for a useable audio output.
 

In the aircraft the receiver was fed by a 2 V 20 Ah lead acid accumulator for the LT (current 1.15 A), and a 120V battery (or dc generator) for the anodes (current around 13 mA). The receiver measures 27 cm x 29 cm x 23 cm (w x h x d), and the weight is a little under 7 kilos with two coils.

Pictured right is a R1082 and below it is the R1082 and companion T1083 Transmitter, inside the Brooklands Wellington, rescued from Loch Ness