This is a transmitter-receiver used in multi seater airplanes like the early Lancaster etc. replacing the TR9 F in that place.
It was used for a short distance communication. The set was placed in a spitfire fighter just behind the pilot, just like the former TR9. In the Lancaster in the mid of the fuseleg.
It is a four channel transmitter. For the receiver, as well as the transmitter, four crystals are used.
The diffents units were: receiver type 25, transmitter type 22 and the rotary transformer powersupply type 104.
To handle the transceiver was much easier then the TR9, because of the 4 channels in receiver and also transmitter.
Channel 1 was used for close distance to the airfield, channel 2 for communication far away from the airfield at close distance, channel 3 was the Command Quard frequency and channel 4 for “Darky Frequency”. Just like in the TR9, the “Darky Frequency”was a frequency of 6,440 MHZ.
In England where it was overcast almost every afternoon and you are low on fuel, because you have been in the air 10 hours you called a “Darkie Station” which was a radio station on the ground (all over England) with a receiving radius of 10 miles. You would call, “Hello Darkie, Hello Darkie, this is Splashboard O Oboe, I need a heading to station 106.” Darkie had all the headings to every field from their particular station, and they would give you, “Splashboard O Oboe take a heading of 273 degrees for 7 minutes.” You then flew that heading and when at position, he let down his airplane through the overcast, and there was your field.
The radio set is remote controlled by a switch box for each channel a knob to push. On the picture a replica controll box is used. But the whole unit is working. Supply voltage is 12 volts, althoug also 24 volts systems exist. Which indicates that the 12 volt version is an earlier one.
Transmitter receiver TR 1196 a
Left the connection for the oxygenmask earphones and microphone. In the front the crystal types. At the right the replica remote control box, for choosing one of the four channels and controlling the transmitter.
Inside the unit.
At the right front the alternator power supply. Behind the receiver. To the right the transmitter.
In front a good view on the crystal board of the transmitter.
In front the earial- and ground connection and the type plate. Also the Air Ministry mark. The white earia is a modification chart.
Left the transmitter with HF earial coils, for each channel one coil. In the mid the four tuning knobs for pre tuning the HF stages of the receiver for each channel.
An overview of the chassis.
A side view.
A nice paper layout picture inside of the housing. It showes the components layout of the transmitterpart for service.