Matching transmitter T1154
For more detailed information on the history of the R1155 see the
British RAF Receiver
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.