RPG4 tube-tester

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  1. RPG4 tube-Tester.

RPG4 tube-Tester.


This german  tubetester is all original. It is a very handy tester for testing the tubes in my german radio’s. It is remarkeble, that even a lot of  american tubes can be tested. So a very useful tubetester.


Picture Above: RPG4 Front View.

In the lid, there is a cable, which you can connect to tubetester itselves. So alle the tube testscockets in the lid comes available.


Picture above: RPG4 inside look.

Right the rectifier tube, left the voltage stabiliser tube,


TR 1196

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  1. TR1196a,
  2. transmitter/receiver
  3. four channels.



four channels.

 Working condition.

This is a  transmitter-receiver used in airplanes like Lancaster etc. It is a four channel unit. For the receiver, as well as the transmitter, four crystals are used.

It is remote controlled by a switch box. On the picture a replica controll box is used. But the whole unit is working. Supply voltage is 12 volts, which indicates it 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.

Left receiverpart and right the transmitter part. See also there the HF coils for matching the energy to the earial.




At the right front the alternator power supply.


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.


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  1. GEE


GEE was a Brittish wartime hyperbolic navigation system, used in bomber airplanes of Bomberc Command and airplanes of Coastal Command, like Lancaster, Halifax and Wellington. It was used to maintain the position of the airplane on their way to their targets, often Germany.

An short explainanation of GEE mapping:

By measuring the amount of calibrated pips on the indicator screen, between the  measured beacon pulses from different, fixed GEE transmitters along the country  (so each Gee transmitter gives a high pip on the screen) , and putting these  measurement amounts , called GEE units, in a GEE  map, man could determine the position of the airplane on the map itselves.Each measured GEE  unit has its own hyperbolic curve on that map. In principle, you have to measure 2 Gee units only. The crossing of each curve was the position of the airplane. For more accurency you used more Gee units, so more hyperbolic curves on the map. You have to interpolate the position by these different crossings.

On the internet this system is explaned very often and well.


The overview of my GEE installation.

Left the GEE receiver with frontend. The receiver is a type R 3645. It is a kind of MF receiver with videoamp. stage. The videostage signal  is fed to the indicator. This receiver picks up the beacon signals which are located on fixed places all in the brittisch countryside.

The frontend is a type 27 b. It converts a tuneable high frequency range of about 65 Mc till 85 Mc into a lower MF frequency of about 6,6 Mc.You could use differnt frontend for different frequency ranges.

In the mid the indicator type 266. On the CRT screen can be seen the beacon-, strobe marker- and calibration pulses.

On the right side the powersupply units, type” voltage control unit no 6″ with its “chokebox no 1″.

These units stabilise a 80 volts 1500 Hz voltage, coming from an alternator.


Here the original alternator, when I received it from an seller  in the UK, type UKX generator.

Normally it is mechanically driven by one of the airplane engines. It delivers the 24 volts DC and 80 volts 1500Hz. Because of the type it was possible to make it run in connecting the 24 volts parts to a 24 volt battery . All it takes about 30 ampere to let it run! In the left box on the generator (right box is 24 volts part with field connection) you could maintain 80 volts 1500 Hz.

The transformers in the receiver- and indicator powersupplies need a voltage of 80 volts 1500 HZ. The demensions of the transformer get smaller and the weight is less then when you use that frequency. Also other electrical equipment do so. Weight is one of the important fact in an airplane.


This is my alternator, type UKX. The little switch on the right is switching on a relay in the no 6 unit, which put the 80 volts on the receiver and indicator. The big switch is putting the 24 volt on the alternator.


Here the powersupply, type Voltage control panel 6, 5U/521. Above the Choke box type1.

These units stabilise the 80 volts from the alternator. Stabilising is needed because of the engine speed is often varying in some circomstances, so the voltage of 80 volts.

In front of it a “ground-flight” switch for switching the whole aircraft installation on the 24 volt from either outside the airplane or airplane batteries themselves. Now used to put the 24 volts on the UKX generator.


Here the receiver and indicator. On the receiver another frontend unit.



This is the screen of the indicator. You could see here the calibration pips and the negative strobe marker pulses. The measured pulses of the beacon transmitters, called A, B and C pulses are not to be seen. This ofcourse because the GEE systen does not exist any more. The last GEE transmitters went down in the end of the year 1960.

The strobe marker puls could be placed on different places along the X-axes by the red and white knobs  at the under side of the front.. By  Putting down the clearingswitch (you can see then the received beacon pules) you first bring the strobemarker puls just under the measured Gee beacon signals, the clearing switch up, you get the caibration pulses, after that you can measure the distance in calibrating pulses between the beginning of the scales and the strobe markerpulses. These differences are called the Gee units. So the position of the strobe marker at that moment is the position of the beacon signal, e.g. A, B or  C  beaconpuls.

I will once build my self a simulator for it, a schematic is already there etc.The it is possible to give a complete demonstration of the GEE navigation system.


Another look on the screen with a different time base. Watch the negative strobe marker pulses.


With the clearingswitch on the indicator, you get the noise  and the GEE beacon signal of the receiver on your screen of the indicator. With the red gainknob on the indicator on maximum, there will be a level of 2 cm on the screen.



Here, the noiselevel is somewhat lower by less gain on the indicator. The red gainknob is regulating the sensitivity of the receiver. When you are receiving the GEE master and slave signals, you can see also the the pulses of about 1 uS on the screen. But because the GEE system does not exist anymore, the pulses are absent.



Here the front of the GEE receiver, type R 3645. The switch “Z and N ” has an anti jamming function. Often the GEE signals were jammed, in the “Z” position a kind of CW jamming was suppressed then. When no jamming was there, the position of “N” was held. (Normal).

Nice is the lightened scale of the receiver tuning, which indicates also the powersupply is working.



The above side of the GEE 266. Tubes inside are the red VR91.



The side vieuw of the GEE 266.



The other side vieuw of the 266. Right above the EHT tube of the CRT. The compartment on the left under the crystals. On the below centre the MF coils strip of the receiver part.



Above the test set no 210.

This typical test set is used for testing and alighning the GEE installation. It consist of a HF generator, suitable for all the frequencybands of the RF units used in the GEE receiver. All frequency signals unmodulated.

Also a wideband noisegenerator for testing the receiver.

And most import a PRF generator. With this it is possible to generate 15 khz pips on the screen of the GEE indicator. In the test set, there is a generator, which is modulated (switched on and off) by a crystalcontrolled modulator/oscillator. This generator, with it’s frequency tuned on the receiverfrequency of the GEE receiver, is crystalcontrolled by 6 xtals. Frequency A till F. The frequency of the crystals are the same as in the timebase generator of the indicator, in this case the type 266.

By finetuning the PRF (the knob just left of the pilotlamp) on the testset, it is possible to synchronise with the timebase in the GEE indicator. When synchronised, the pips stand still on the screen.

The output of the testset is connected to the GEE receiver input by a coaxialcable.

Also a whip earial can be used, it consist of 3 parts.

The frequency of the generator can be tuned , by a tablechart, by the big black knob at the left on the front.



Here the 15 khz pips on the the screen of the GEE inicator, type 266. The clearingswitch on the indicator is up, position “receiving GEE signals”. The switch on the test at “modulation on”.

By adjusting the gain on the indicator, the noise level can be taken away, so that only the pips and the strobepulses are left.

The faulty part of the of the timebase at the left is probably a fault in the flyback phase or liniarity of the timebase of the circuit. I left it like that. For demonstrationpurposes it’s not so important.

R 1224

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  1. RAF  R1224 A

RAF  R1224 A


This is the RAF R 1224 A receiver. It is a superhet receiver. It is part of the Station W/T portable Type 9.

Frequency range was 1,5 Mc – & Mc.

Output impedance 2000 and 8000 ohm.

Heater voltage 2 volt.


R 1147A

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  1. RAF  spitfire receiver R1147A

RAF  spitfire receiver R1147A


The R 1147 receiver is a homing receiver for use in a Spitfire aircraft, spitfires of the RAF P.R.U. squadron. P.R.U. stands for Photographic Reconnaisance Units. At that time these Spitfires had no radio of any kind. The receiver was remote controlled by a mechanical bowdencable (splineshaft) from the cockpit. A Mark 5B stopwatch was included in the system package for timing the beacon signals.

This receiver only existed for a short amount of time, starting March 1941. They were loaned from the Royal Navy for a test in that year, because the PRU squadrons needed the use of homing at that moment. Because of the receiver’s weaknesses, they were eventually replaced by the TR 1133 in 1942. The TR 1133 also had communication possibilities.

Frequency range of the R 1147 is 180 Mc-220 Mc. and used a small whip antenna on the aircraft.






The picture above displays the cockpit’s remote control R1147 receiver. It was placed beside the pilot and connected through a splineshaft cable to the R1147. This remote control unit looks just like the one placed on the front of the receiver. Watch the tuning scale on the side of the remote control unit. Markers at A, B, C and D

R116A - 1

R 1116A pre war aircraft receiver.

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  1. R 1116A receiver,

R 1116A receiver,

a real museum piece.

This receiver, is what you call, a very old fashion radio receiver. A military design just after the “spark transmitters and receivers” episode  in WW1. They are very scarce to get now a days. That is why, it is one of my most favourite receivers in my collection.

The receiver is in an  entire original condition and working! Only the grid battery is a copy, see pictures below.

The R 1116A receiver is a later version of the R1116. It is a prewar aircraft receiver, which was used with the T 1115 transmitter. The aircraft was , for example,  the   British torpedo fighter “Swordfish”, which operates from aircraftcarriers at sea. The swordfish was wellknown  by actions against the German Bismarck, by attacking it with torpedo’s. Amazing fact is, that both the receiver and transmitter were placed just behind the pilot in the open cockpit. The pilot was also a radioman and gunner.

The receiver is a double superhet receiver. No  HF amplifier stage, just a tuned coil before the mixerstage,  first IF is 10,7 Mc, second IF is 100 Kc. The sensitivity is very well, and the bandwidth is small because of the 100 Kc frequency. Audio is sufficient because of the VR 35 final amplifier. My receiver is working very well . I’m using it also at the 80 meterband for AM, SSB and CW. Also provision is made for direction finding. The receiver can be switched  to 2  different parts, LF and HF. Each part can be switched into 3 different wavebands. Funny is, that the scale lightning  is changing by choosing either the LF or HF part, from the one to other scale.

The front of the receiver.


Another look at the under side of the chassis.  The LF stage and detector stage.


Just below the chassis Just left the variable condensors for pretuning the HF stage for the LF and HF part.


A simplified circuitdiagram of the receiver.  The diode at the input of the first mixer is for protecting the receiver for very strong transmitter signals. The diagram is only for one part and one frequencyband. It  has also a provision for an intercommunication  by means of the T7 microphone  connection. The preamp V6 and final  V7 is used then. V 8 is the CW oscillator. R 13 and R 16 are used for an external LF gain remotecontroll.


R 1082 pre war aircraft receiver.

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  1. R1082 receiver,
  2. A real museum piece.

R1082 receiver,

A real museum piece.

The receiver is all original from the out- and the inside.

Just like the R 1116 receiver, this is also one, which is a very scarce radio to get. A very simple design with only 2 tuned coils to determine the receiving frequency. One  for the HF stage, and one for the detektor stage. It is also, like the R1116 receiver, one of my favourite radio’s of my collection.

The R 1082 is a prewar aircraft receiver, used with the T 1083 transmitter. It is a TRF receiver , with 2 single coil  for each frequencyband.  One for the HF stage (below on the front) and one for the detector stage (above at the front). There are various freuqency wavebands.  The receiver could also been used for directionfinding purposes. For DF, at the head of the the HF coil, there is a symmetrical inputconnection for the cable of the loopearial. Directionfinding must be carried out  by means of  listing to the signal minimum. So no DF instrument. On the first picture a special (green) S-type coil (detector) is used. At the top of the coil, a spline cable for remote control can be attached. The meaning of this is only for readjusting the frequency a little bit. Only small  tuning is possible, otherwise you have to retune the HF stage also, when you make larger requency tuning.
It needs 2 volt fotr the heaters and 120 volts for the HT.


The above picture shows my receiver R1082. In front at the left the 2 volts heater battery and at the right  a couple of  coil sets for different frequency bands.


The receiver from the right side. Note  that  the aluminium case for the receiver  is put into a wooden case.


As seen above:  a close view of the front of the receiver. The cable for the PSU is homemade by lack of an original one.  The connector is made of a piece of teflon.



This is the coil set box, for the different frequency bands. A very hard to get box! Sure when it is complete and it is.


The schematic diagram.

R1082 a

The receiver R 1082 and transmitter T 1083 under test in an Australian Army service department.

Left the R 1082, right the T1083.


FUG 16

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  1. Bordfunk Gerat Fug 16 Z

Bordfunk Gerat Fug 16 Z

This set was build in 1943 by Lorenz.

It is a VHF transmitter, used in fighterplanes like Messerschmitt BF 109. But also the ME 110.

It was remote-controlled from the cockpit. The transmitter-receiver itselves was located in the balley of the fighter plane.

Also it could be used as a direction finder.

 Fug 16 Z front

Picture above:

 Frontview of the Fug 16 Z. Here you can see the servo’s for remote controlling the set. One at the right for the transmitterpart, to change frequency, and one in the mid, for shifting the receiver frequency about 30 Khz, up and down.

Fug 16 Z up

Upperside  Fug 16 Z. At the left the receiver part, in the mid, the LF part and at the right the transmitter part, with 2 valves RL12P35 in the power amplifier stage.

Fug 16 Z back

Backside Fug 16 Z.


The FUG 16 in the inside of the Messerschmidt ME 109 fighter plane. It was controlled at the pilot seat by a remote control.


Some time ago I purchased finally after years a original cabinet for it. I only had to buy the cabinet together with a FUG 16 ZY. Which was missing some parts in it. But now the FUG 16 Z was all complete and original. A separate cabinet is very hard to get and expensive nowadays.

See the pictures below.





The picture below is the FUG 16 ZY. Without a cabinet :). Maybe still a extra cabinet in future? I don’t know if I will look for it.





FUG 10

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  1. German Fug 10 airforce radio installation

German Fug 10 airforce radio installation


The Fug 10 is a very complex installation for communication  between airoplane to airoplane (Bord zu Bord) and from airoplane to ground (Bord zu Boden). It consists of several receivers and transmitters for the shortwave and long wave and a lot of remote controlls. In other circumstances it is combined with navigation purposes. (Peil G6 with EZ6 receiver, then called Fug 10 P).

The transmitters are very stable in frequency, by using special temperature compensating arangements  in the oscillator circuit. Consider, that this oscillator is not crystal controlled. The heat inside the cabinet is very high, because the principle is a MOPA transmitter in a very small cabinet. The oscillator valve is RL12P35, which much deliver much driving power to the power amplifier. This power amplifier has to deliver about 60 watts to the antenna at CW mode, by use of 2 RL12P35’s.

This arrangement was not only the use of ceramic material, but also a special condenser block in the circuit of the oscillator. These condensers had a big dielectric loss with a particular temperature coefficient. More about this a extended explanation n the post EZ6 DIRECTION FINDER.


Bordfunk 010

Displayed in the picture above my Fug 10 equipment. It is in working condion! I use the the short wave transmitter and receiver in the 80 meters amateur  band and made several contacts. The frequence stability is amazing!

Most units (EK,EL,SK FBG3, SchK13 and U10E ) are in working condition. Upper row “Funkerschaltkasten (switchbox), EK receiver  (shortwave 3-6 Mc), EL receiver (long wave 300-600 Kc). Mid row “Fernbediengerat” FBG3 (tuning the antenne tuners, switching antennes etc.), SK (shortwave transmitter), SL (longwave transmitter). Lower row “Eigenverstandigung Verstarker” RG 10 (intercom amplifier etc.) , “Umformer” U10 e (rotating power transformer for the receivers).At the back of the rack are placed, not visible on the picture,  the AAG2 antenna tuner and the transmitter  rotary transformer U10S.


Picture above: a close-up of the units.

On the left lower row, a important control unit, the FBG 3, explained later in the post. At the front 2 knobs for tuning the AAG for matching the antenna to the transmitters for long wave and short wave. One knob for long wave (blue) and the other for short wave (red) . This knob is mechanical attached to a synchro motor system. In the mid the antenna current meter. With the big switch, with scale, in the mid, you can switch the transmitters either for long wave are short wave and which antenna to be chosen. Normally one short  antenna f

or short wave, and a long antenna, the trailing antenna, for longwave. It is possible to change the long wave transmitter from trailing antenna to short antenna, so the short wave transmitter from the short one to the long one. This in case, one of the antennas is broken.


In the above picture you can see at the left de ADb ‘s. In this case a ADb13 type. It is a remote connectionbox for the microphone-telephones in the oxygencaps of the crew. At the right the U-10-e rotarytransformer for the receivers.


On this picture above,  you can see the trailing antenne  type AH-10. At the front of the “Funker Schalt Kasten” is a switch to move the antenna wire up or down. Also a indication meter is placed, for how far the trailing antenna is released.

 FUG 10 met AAG3

The FUG 10 with the fully working AAG 3. Note that the trailing antenna is also there, which came later in the collection.


The AAG on the testbank. Just to be seen, the schematic diagram and wire connections.


The inside of the AAG. Left the vacuum relay. When pushing down the CW key, the relay comes up. When releasing, it falls down again after a few seconds. This is working very well and pleasant. Above the long wave variometer. Above the variometer, the indication scale of the tuned frequency, the same scale is on the FBG3 control. Both he scales are turning synchron with tuning.


Another view of the AAG. At the left, the short wave variometer to be seen. Just in the mid, the synchro -motor for driving the variometer coils. This motor is driving by a “Drehfeld  System” , a kind of electrical achs, coming from a same type of synchro in the FBG3. This synchro is turned by hand with a knob, with same scale as on the AAG, to tune the match.


A nice look on the vacum relay. It can be activated (transmit and receive) by 2 coils, seen on the picture.

Till so far my FUG 10 installation. There are still some parts missing, maybe they come in future.