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Duxford Radio Society


Imperial War Museum, Duxford, England 



Conserved Equipment Details


 


Receiver Type R1155A

 
Receiver R1155
Matching transmitter T1154
Matching transmitter T1154


For more detailed information on the history of the R1155 see the Equipment History Files section.

British RAF Receiver R1155A

Receiver type R1155 was designed primarily for use in aircraft, in conjunction with transmitters of the T1154 class, and was a key component of the HF radio installation for all Royal Air Force bombers during most of the Second World War.  The equipment was also installed in RAF Air-Sea Rescue Launches, used in ground stations and in some radio vehicles.   The original or "parent type" of the receiver is the R1155, and later variants were models R1l55A, B, C, D, E, F, L, M, and N.

The receiver covered the frequency band 75kHz to 18.5 MHz in five ranges.  Both modulated and un-modulated signals could be received on all ranges and provision was made to operate with a D/F loop aerial on ranges 2, 3, and 4.  The Wireless Operator could take direction-finding bearings by either visual or aural means.

For reception of communications signals, the receiver could be operated with either fixed or trailing aerials; a fixed aerial was normally used for the HF ranges, and the trailing aerial for airborne installations on the MF ranges. The D/F loop aerial, such as a Type 3 or 4, was the standard fit for the direction finding facility.

In airborne installations, a rotary transformer power unit driven from the aircraft electrical system provided the power supply for the receiver.  This power unit also provided the LT supply for the associated transmitter T1154.  For ground installations, a separate power unit Type 114 was used which operated directly from 230 Volt 50 c/s AC mains.

After initially creating a number of variant models for different applications, by August 1944 the number of variants in production was reduced to 4 types.  The type R1155A was used for Halifax bomber aircraft, the R1155F for all bomber aircraft other than the Halifax and for other types of aircraft that required aluminium cased versions (to lessen interference with the magnetic compass).  The type R1155L was used for general-purpose use (aluminium cased version of the R 1155N), and the R1155N for all other general use except in bomber aircraft.
This individual R1155A unit, Ref. No. 10D/82C , serial no. 18129 is in completely original condition, and is fitted with all of the various approved modifications given to the equipment series during its service life-time.

From the EKC inspection stamps which are visible, it is deduced that this unit was manufactured by the sub-contractor E.K.Cole at the Southend-on-Sea factory, before production was moved to other locations.
This set was donated to DRS, and is unusual in that no un-authorised modifications have been made and all of the original circuit elements are intact.

Due to the excellent condition of this equipment, conservation work has been limited to
general cleaning, light re-touching of the paint and  retuning.

The equipment is currently in full working condition.
R1155 inside top
R1155 inside top rear
R1155 inside end view
R1155 inside end view 2
R1155 underside with covers on
R1155 underside with cover off

R1155 RF wiring rear view
R1155 RF wiring top view


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