RAF Lancaster

Lancaster radio- and navigator section

 

A half year ago, the idea came to do something else with the T1154 and R1155 collection, instead of putting it just on a wooden shelf or something.On several sites on internet I saw that some people made a complete Lanc mockup of these equipment. ( Jan and Paul Bodifee at Deventer Holland and Norman Groom in the UK). This was something for me. But I did not had so much room, I got to remove my other radio’s to some where else. That was not possible. So I had to make it more smaller than the others.So this is the result in a smaller size, but still very nice.Of course the navigator section just behind the the wooden board of the wireless operator had to be there! And of course the T1154 and R1155 had to be in fully working condition to work my radio amateur colleys. It has to be noted that the whole mockup is still under construction, a lot of work is still to be done, but nevertheless some photograph’s of it.

A close look of the famous and wellknown T1154N transmitter. Left the earialswitch typ J.

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The position of the various electronic equipment inside the AVRO LANCASTER aircraft in the late war years 1944/1945.

 

This is a view of the radio section of the Lanc shown at the Imperial War Museum in London. The photograph was taken by myself during a visit of mine. This was the start of the idea making a Lancaster mockup of my own.

 

 


The radio operator office. Left the antennacurrent meter for the HF bands, also the earialswitch type J.

Note the microphone connector on the front of the transmitter above. This special connector is a very rare one, very difficult to get.

 

 

Here a good look on the tubes compartment of the transmitter. Left the VR 105’s of the VFO and modulator. Right the VR 104’s of the poweramplifier.

 

 

 A fine look of the transmitter from below.

 

 

 

 

Left the plot for the headphone/microphone for the oxygen mask of the radio operator.

 

 

 

 

The receiver R 1155 A. Note the centric tuningknob, Later on the 2 knobs were concentric.

Again a good look on the radiotubes of the transmitter.

 

 

This is a more closer look of the A1134 intercom amplifier unit and the Plugboard type 192. This plugboard can be used to connect the amplifier to several other equipment in the aircraft like TR1196, TR 1143 or TR9 transmitters and of course to the headgear/micorphones of the crew. At the right the receiver R1155 A.

 

 

Another look on the A1134 intercomamplifier. On the left the switch for putting it on the intercomeline to navigator, airgunner, pilot or let it function as a speechamplifier for the radio transmitter T 1154. Right the on/off switch of the unit. A small user manuel for using the amplifier on the forward side of it. The amplifier is fed for the filement from a lead battery and for the HT from a small vibrator psu unit.

 

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This is the direction finder loopantenne on the roof of the cage. It is a replica of the original one. A big “steeringknob” with scale, placed under the skin is for turning the loopantenne .

 

 

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This is the navigator office. Above the well known Gee set indicator type 62. On the middle the API (Air Position Indicator)  unit just above the table. Above in the mid the compass corrector.

 

 

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A view of the Air positioning Indicator left . On the right side on the front 2 mechanical counters for the longitude and latitude in degrees and minutes. A mileage unit, fitted below the navigator bench, converts the forward air pressure from the pitot tube ( an open ended tube facing forward in the air flow) into a rotatery speed such that this speed is proportional to the airspeed of the aircraft. A flexible cable couples this rotary output to the API and together with an electrical signal (compass bearing) from the mastergyrocompass, produces an output on the 2 counters on the front, that read directly in degrees and minutes. Just rught the four channel remote controlbox of the SCR 522.

On the backpanel several instruments. Also the IFF buttons for destruction the insideparts of the indicator and IFF unit in case of a crash behind enemylines. 

See also right on the panel, a callbuttonswitch/lamp for telling the radio operator that the navigator wants access on the intercom. The radio operator also has such a callamp. He noticed that the lamp is burning, so the he connects the intercom amplifier A1134 , which acted at that time as a speechamplifier for the radiotransmitter, to the intercomline. So also the airgunner or the pilot has a callbutton with lamp.

 

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On this view the VHF transmitter SCR 522 is shown. Normally it is not placed below the nav. bench, but I did so because of the lac of room. The TR5043 is the Brittisch version of the American SCR 522 and in use in the later years of wartime. It is a 4 channel VHF set for “darky “communication, when the aircraft lost the navigation to the airfield. By this communication they could find there way back home when other communication equipment failed. Also visible is the controll box withe the 5 red knobs on it. One for putting the set on (upper one) the other 4 for the choice of the 4 channels. Just below the switch for putting on the transmitter.

When nothing is working in the navigation installation, they could use the socalled Bubble sextant at the right side of the table for determine the position of the airplane. This by the “old seaman way” by “shooting” stars in the sky and then reading the values on the sextant, then with these values determine you position on a map.

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Left the GEE Indicator type 62 A, right the GPI. at the left upper part of the picture again the compass corrector.

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The homemade tuningscale of the directionfinder loop. The wheel is an original one. Above a cockpitlamp for illumination of the navigatoroffice, which is not a replica..

 

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GEE receiver box with frontend unit ,below the voltage control panel no 3 as a regulator for the 80 volts – 1500 HZ from an alternator. The 80 volts is needed for the receiver box and the indicator unit.

 

 

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A front vieuw of the radio compartment, showing also the airplane skin.

GEE 266

Another GEE-indicator type 266. Note the blue switch on the lowerright This switch can select more crystals instead of the one of the earlier type indicator no. 62.. The 266 was a later improved version. Main changes was the internal EHT powersupply. This powersupply was not there in the type 62.

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The two dynamotors for the reciever and the transmitter below the table. The upper is the HT dynamotor for the transmitter, supplying 1250 volts DC, that one below the dynamotor for the receiver supplying 6 volts and 220 volt. The powersupplies are being fed by a mainpowersupply of 230 volts 50 Hz.

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Picture above shows the 2 HT dynamotor supply units, the above for the transmitter and the below one for the receiver.
On the left a homemade 2 – 100 volt mains supplyunit for the A 1134.

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The picture above is the crystal calibrator used in the lancaster for calibrating the frequency of the transmitter T 1154. It is fed by the same 2 volt accumulator and vibrator powersupply used by the A 1134 intercommunication amplifier.

Several internal crystals can be used, even a spare one at the front of the calibrator.

 

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The pictures above is the trailing earial of the T 1154 transmitter for especially the medium wave frequencies.

 

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Note the small balls at the end of the wire. They are lead balls, to let the earialwire going down easier  because of the weight of it.

The lead to the J-switch has to be very well isolated by isolation standoffs because of the high HF voltage. Because the small length of the earialwire is too  short for it’s frequency, the HF voltage at the beginning of the earial is very high.

 

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The wounded up earial just under the radio operator table.

Posted in General Airforce radio's.

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