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.
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