Transmitter/receiver TR 9-F

The TR 9 is the pre war wellknown sender receiver.  Although the type 9 F is was used in the bigger aircrafts like Lancaster bomber etc. for communication between the airfieldtower and the aircraft or in close distance to other ones. For fighter planes, the TR9 D is used, some slightly different. It was fully remote controlled bij bowden cables.

In the Lancaster, the TR9 F was positioned under the navigator table.

The TR9 D is different in use comparing it to the TR 9D. The TR9D is used in fighterplanes, while the TR9 F is used in bigger planes, like the bomber Lancaster.

Fighterplanes are one person planes, while bomber planes have more persons on board.

In the TR9D, the receiver type R1120 and the transmitter type T1119 is used, while in the TR9F the receiver type R 1139 and transmitter type T 1138. The receivers have the same schematic, but the transmitter have different schematic. It is the internal connection I/C which is in the T 1138 is not connected, while in the T 1119 is. The I/C connector is an extra connection to input of the 3-stage audio amplifier in the receiver. In the T 1119 transmitter it is cinnected to the external mic . So in the TR 9 D the 3-stage audioamplifier can be used also as an intercommunication amplifier.

In 2 seaters fighterplanes, this intercom amplifier can be used.

In the T 1138 transmitter the external mic is connected to the micc transformer V3. This external mic connection can be connected externally to an A 1134 intercom amplifier acting as a preamplifier for an dynamic microphone. This for modulating the transmitter in mode A3 (anode/screen modulation).

It is working now in the 40 meter band with a crystal on 7078 Khz.

The transmitter is a two stage transmitter, a crystal controlled oscillator and one power amplifier. The receiver is a TRF receiver. Also in the receiver part, a three stage audio amplifier for the headphones. This amplifier can also be used as a A3 modulator in conjunction with a preamplifier type A 1134.

The transmitter has 2 channels. One is the normal channel N for communication and the S channel is the special frequency channel, which could be used for  PIPSQUEAK purposes. This system is discribed in the post PIPSQUEAK.

The front of the transmitter. 

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Inside the transmitter.

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The power amplifier tube in  the transmitter.

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The power amplifier anode coil in  the transmitter.

The front of the TR9 F. Left the transmitterpart, right the receiverpart.

The intercom amplifier, type A 1368 connected, by lack of the original used amplifier type A 1134, to a homemade plugboard. My A 1134 is used for the T 1154 transmitter.

The front of the A 1368. Note the missing switch at the left , which is there at the A 1134. The amplifiers are the same, with same radio valves, same powersupply voltages 2 volt DC and 120 volt DC. Only the connector on the plugboard are smaller ones. So my plugboard can not be used with the A 1134.

Board with headphones connection, psu connection and the volume gain knob. The volume regulates the Second grid of the HF amplifier of the receiver.

This is a picture of a TR 9 in the Science museum. Probably the TR 9 D for fighterplanes, Spitfire, Hurricane. Watch the remotecontrole with bowden cables and in the mid the volume gain control. The remote control is extremely rare and hard to get.

Posted in RAF TR - TA radio's.

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