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Duxford Radio Society


Imperial War Museum, Duxford, England 


 
Restored Equipment Details


 

Reception Set R103

R103 front view

Reception Set R103 (UK)

Reception Set R103 was a small HF receiver designed for monitoring applications in British Army non-combat vehicles such as staff cars.  The design appears to date from before 1940.

The equipment covers the frequency range 1.7 - 7.5MHz in two switched ranges and is tuned by a Muirhead drive featuring a directly calibrated engraved tuning dial.  It was intended to be used with an external power supply, which operated from a 12 Volt DC supply, and which also contained the loudspeaker.

The receiver is a seven valve conventional superhet, consisting of a single RF amp, mixer/LO, two IF stages, detector/AVC/AF amp, AF output stage, and BFO.

This example of the R103 is serial number 170 and was manufactured by Masteradio in 1940.

The equipment is of all sheet steel metal construction and follows a box-within-a-box approach with the components mounted on paxolin sheet tag boards.  The tight fitting valve screening cans are retained by a bayonet action and each valve has a padded collar of horse hair like material.

The receiver unit has undergone a medium scale mechanical  restoration involving cleaning,  re-tapping of holes, replacement of screws and re-spraying of the outer case.

The equipment is in working order, however it does not have the original 12 Volt PSU.

R103 top inside view
R103 left hand end view
R103 underside view
R103 valve with padding collar and screen

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