Dear page visitor we have created on 15 March 2011 a second webpage
Our "Exhibits details page 1" was becoming so overloaded that it doesn't work sufficiently any longer and a new additional page has been introduced.
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Entre your particular search word and all those words inside this document will be successively shown
Since 14 June 2011 we have separated small components and dedicated for it a new webpage:
Due to this decision, we have moved these smaller items integrally towards this new webpage. These are thus no longer shown on this current page.
Please be aware, that since 22 July we have split this webpage as is becoming too much loaded.
Exhibits details page 3
Page being modified Status: 13 January 2015 +
22 October 2017
All these artefacts are already in our possession for > two decades. These web pages are providing a fruitful platform and worth to be shared with whom interested in this matter.
Giant Wurzburg frequency divider
Front panel of FT65
Right hand-side of FT65
Left hand-side of FT65
The steering control amplifier to the Giant Wurzburg also known as AEG-Steuerung.
An amplifier module of the AEG-Steuerung (steering azimuth or elevation)
The two brown valves are both type LV30 is providing the steering-signal for the power thyratrons.
Time base oscillator of the OSZ62 as well as the first Wurzburg type A
The small bulb on the left is part of the Wien bridge oscillator, and is particularly acting as a signal output stabiliser
The timebase of OSZ62 and FuSE 62A
Time base oscillator of the OSZ62 as well as the first Wurzburg type A
The small bulb is part of the Wien bridge oscillator, and is acting as a signal output stabiliser
R&S (PTE) admittance measuring apparatus type VLUK, shown: "Inside out".
I know that most "Museum curators" are not very much in favour of our approach, though, I strongly believe in this new presentation. As it shows what technology could be discovered inside measuring apparatus. The circular housing in front on the left is a HF tuneable resistor (potentiometer). The big (screened) drum is housing the power signal source (10 – 100 MHz). Interesting is, that our apparatus is carrying a label of: WaPrüf 7/1, the German army institution engaged with communications and related topics.
I guess, that those interested in the history of German wartime technology might have heard of 'Waffen Prüf' as a German army organisation. Wa Prüf 7 was the institution dealing with, say, electronics related technology. The chance finding an artefact with such a label on it may be regarded being 'null'. It is the only example we have in our collection. Our VLUK apparatus had been swopped in the early 1970s. According the text it may have belonged to subsection /1
VLUK signal source (cover lid taken off)
The high level signal generator is constituted around valve type RS377
VLUK, in front we see the fine measuring section
The scale-drum is calibrated in pF.
The Telefunken double pair of UHF diodes are clearly visible
I don't know their actual type number. Please notice also the typical application of "Schaumgummi" (once invented in Germany)
VLUK, the valves in front are: AC2 - STV280/40 - AZ1? The long glass devices are so-called EW xxx (EW = Eisenwasserstoff = Fe wire kept in a low pressure H environment), barraters by which means some of the low current filaments is to be stabilised
I raised my query onto Heinz Trochelmann who kindly sent me this photo
Its construction is clearly understandable. I must admit that I never have seen such a valve type before. I might, however, have seen this type number, but never have associated it with this kind of device. I might have thought of a RG12D2 or that kind of valve.
On 13 April 2011 +22 October 2017
Incidentally reading a DDR publication on carrier telephony (Trägerfrequenz Fernsprechen, by Gottschall, Helmut Graf and Heinz Gabriel of 1959)
Quoting from page 193:
Durch die im Bild 3.16 gestrichelt eingezeichneten Änderungen lassen sich A-Endstellen leicht als B-Stellen umschalten.
Die Zwischenverstärkerstellen enthalten für jede Übertragungsrichtung einen Breitband-Gruppenverstärker, in dem die in Richtungsweichen aufgetrennte A- bzw. B-Gruppe verstärkt wird. Dabei kann jede Gruppe auch mittels der 204-kHz Trägerschwingung in den Frequenzbereich der anderen Gruppen verschoben werden, um eine Rückkopplung über dritte Kreise am Gestänge zu vermeiden.
The apparatus dealt with is here the rather advanced (mobile or at least movable) Siemens MG 15 carrier telephony system. Not one simply creating a group of channels, but using so-called Verlagerungstechnik. This implies a technique operating carriers up to 204 kHz.
Therefore it is rather likely, that the device shown next once was part of a MG 15 carrier-telephony system; in the 1940s and likely some of 1950s.
Let us bear in mind, that once Siemens was one of the leading companies in Europe!
Let us now continue where we did so in 2011:
we continued with a quite curious device, which is already in our possession. It might have been purchased from Ebbe Peedersen in the 1970s.
Siemens & Halske (S&H) quartz oven type: Rel.Bv. Th 104; Serial number: 418610; Ausg. I date 3.42. For this occasion this might mean: week 3 (January) or month 3 (March) 1942 Rel. Vertr. Skizze 5511? (Skizze 5511? = Drawing number)
I cannot judge the purpose of this: thermostatically controlled quartz oven.
Metal lid being removed. The felt block with its central hole is to prevent the influx of outside air. As to keep this optimally isolated from its environment. The shaft in the centre is tuning (setting) the working point of an in a glass-envelope housed switching device
The glass-envelope is good visible. The outside wound wires constitute the heating system. It might seem that it is made of Bakelite, but I guess that the brown colour is due to paint. Please view the top section of the next photo
On the left hand-side we see a quartz crystal for 169,5 kHz serial number 1371. Not entirely visible the two tuneable shafts are, as far as I understand these are to adjust the thermostatic working point
Quartz crystal Rel. Bv. 76/3; quartz resonance frequency 204,000 Hz ( = 204 kHz)
The meaning of the number 12/113 might be a kind of production serial number
Viewing the code on the aluminium grip the manufacture-abbreviation is HE
For what purpose was this oscillator device being meant? I guess it might have been applied in a carrier-telephone system. 169,5 kHz points in the direction of a long wave signal source. Though, the typical S&H quartz at 204,000 Hz points into the direction of carrier telephony systems. I don't know it real application. The only Siemens system I know is type: MG15
Is there someone around who is willing to share his expertise with us?
Please type in what you read
On 19 April our Korfu receiver has been photographed in detail
Korfu receiver of the latest version. It might have been produced in December 1944 or January 1945. It is manufactured by Blaupunkt code: fvw
The S-band plug-in of the Korfu RX (Einschub)
The left hand-side connector called : Frequenzmesser (or wave meter) and is for checking the actual frequency of the local oscillator, by means of FM351 (please notice the photos down this report). An interesting aspect is, that these connectors were called by the Germans "Rotterdam-Stecker". The reason was, that these types are a metric copy of the SHF connector of the British H2S transmitter. They differ slightly, as the Germans used metric thread.
The rear side of the S-Band plug-in unit to our Korfu RX
The coaxial connector left of the circular cavity is the IF output. The brown Bakelite knob on the right hand-side is the puller of the mixer oscillator RD2Md2.
The plunger of the central cavity is being pulled a bit out
The cable entering the cavity nearest to you, is carrying the oscillator signal generated by the RD2Md2 magnetron.
The mixer cavity (tuning plunger being removed)
The mixer diode being pulled out a bit
Magnetron-Oscillator type RD2Md2 being pulled out a bit
RD2MD2 in detail
Tuning mechanism of the oscillator circuit
Korfu RX with S-Band tuning module being pulled out of its frame
The connector which seems to be connected by a bundle of brown coaxial cables is the IF connector (actually only an optical illusion)
Korfu RX viewed from the top (top lid being opened) The S-band plug-in unit is not yet replaced
Tuning mechanism of the wave meter to the Korfu RX Type FM351 (Frequenzmesser 351)
For this occasion it has been set at: 49,88
According this calibration table the wave meter is tuned at a wave lengths of just below a λ of 8.4 cm
On 21 April newly photographed artefacts have been added.
Closed box of the wave meter (Wellenmesser) type for the FuG102A airborne altitude radar. The A1 version of schematic 5 (Anlage 5)
Wellenmesser serial number 611. Date of calibration (acceptance?) 18 October 1944
Please notice that ET 102a is meaning the - receiver of this radar set (ET = Empfänger-Teil). The actual transmitter frequency is being read off at the left hand-side of the scale. The calibration text inside the top lid is a bit confusing, as we notice on the left hand-side the especially marked 1,67 - 1,65 - 1,63 and on the other hand that the receiver oscillator has to be tuned at say, 1,65 = 47 scale divisions. The solution might have been - that the calibration has included the first local oscillator setting of the receiver. Being acquainted to German technology I am afraid that this guess is incorrect.
Viewing the wave meter from the perspective where it was meant for
The construction is sound and might reflect that it had been designed and manufactured by Philips (Eindhoven NL)
Some thought that the entire FuG102A had been developed by Philips, most likely this was not the case. As it was designed by FFO (F.F.O. = Flugforschungsinstitut Oberpfaffenhofen Bavaria). What likely occurred was, that Philips might have manufactured the set. Unfortunately I was never in the position to obtain an FuG102a receiver and/or transmitter. We have, since recently, swopped the power convertor module (U102a)
It is evident, that its design is basic
It is evident, that its design is basic
The acorn valve might have been type DA2? It was heated by means of a so-called type-A cell (also known as Mono-cell) of 1.5 V (3 V??). The battery was clamped between the two contact-strips just above the tuning capacitor or better noticeable in the forth photo of this 102a series
Relais-Wettersonde SWE 2 code-name Mücke
Meteorological data transponder
Type label stuck at the transport case to WSE2
To notice the nature of this rather interesting weather-sonde, please click on one of the two cardboard box photos (the two picture hyperlinks above)
The meaning of the text-label is: Be careful its content is fragile!
From JØrgen Fastner (Norway) we obtained five window (Chaff) strips, which according his information must originate from a German source, thus being original Düppel strips.
The length of the window or Düppel strips are 79 cm
The strips are thus being meant for 2 x 79 = 1.58 m wavelength
As we know: λ x f = c → f = c /λ → 300/1.58 ≈ 189 MHz (shorted notation). When we take into account the velocity factor, these kinds of window strips may have been used against British ASV operating about this frequency spectrum
For us an open question is, did the Germans seriously considered this spectrum being still in use widely, since they must have known about H2S and their derivate systems, from spring 1943 onwards?
After I have discussed my doubts whether these window strips are originally German, JØrgen Fastner send me some additional photos.
The figures 800 - 20 mm indicate that these Düppel strips are being sized: 800 mm long and 20 mm broad. That I measured 790 mm might be due to the fact that our strips are not entirely of a flat nature
A crate containing three yet never been opened boxes. He must possess still at least an box, as our strips must have been taken from it
'Deckel Oben' means box-lid at the top
Dry and cool storage
Keep it dry and store it cool
Interesting is the date stamp: 24 February 1944
Another batch date available is: 1st March 1944
We may regard these five photos being quite unique. Finding originally packed boxes with German Düppel (= window, chaff) is rare, but finding them packed in their original surrounding makes it most exceptional.
This finding indicates also that Norway is a place where German stocks remained for decades, as they left the country without serious fighting and without taking their equipment back home. They simply surrendered unconditionally. And, there was far too much material around to be captured by British investigators.
On 19 May we photographed a new series of details. All apparatus shown are already for at least a decade in our archives. Everything we take care of will successively be put on the web.
For this session I decided to take photos of an apparatus that is not directly in line of what we show on the web generally. Namely a so-called Libellen-Oktant which is more or less comparable with the well known 'Bubble-Sextant'. Maybe a bit more sophisticated system as Sextant- which points to six points and an Oktant to eight points. It was used for celestial navigation in aircraft ('suiting stars')
Gerät Nr 127 - 134 B
Confusing is, that this actually is GAF construction drawing number
Manual: L.Dv.T. 4051/1
Libellen - Oktant - mit Mittlungseinrichtung
'Mittlungseinrichtung' means of time integration (as was done in the Bubble Sextant as well
Bauart C. Plath - De Te We (Deutsche Telephon Werke, in Cologne). I don't understand their interconnection. As Bauart is C.Plath and it had been manufactured by C.Plath as well. An option might have been, that parts had been manufactured by De-Te-We.
Werk - Nr. Serial number; these numbers are as always being coded (Zerwürfelt), maybe it carried production number 210 or 610 who knows?
Anforderz. = Anforderzeichen Fl23750. This is the GAF stock number
Hersteller C. Plath This was a very well known company in the field of navigation. In the late 1930s or early 1940s the C. Plath company did split up in a navigational and a HF directional finder company under Maximilian Wächtler (the German HF/DF 'Papst')
Box lid opened.
The Libellen-Oktant still being fixed in it.
The Libellen-Oktant still inside the box, fixed by means of spring loaded wooden clamps
The Libellen-Oktant now removed
Down on the left we see three spare miniature light bulbs which is to illuminate that the air bubble being kept exactly in the centre as to guarantee that the apparatus is being kept exactly in a horizontal plane. In the background on the left we see the battery adapter with its power cable. The adapter replaced a kind of type C dry cell. The function of the device on the right I do not understand where it is to be used for.
When I told late Kees de Wilde that I had obtained a complete Libellen-Oktant he instantly answered: no doubt the ocular is missing! I was shocked by his message - as I didn't know there should be one included. However, I was relieved to discover that the ocular was indeed incorporated!
It is clearly visible in which way the ocular is being attached to the Libellen-Oktant. Shown is also the left hand-side of the Libellen-Oktant
The same situation though viewed from a bit different perspective
The two rectangular glass filters may, I guess, be employed when the light intensity is too high, like directly or indirectly originating from the sun.
Shown is the way in which the filter is to be place. I guess that the second glass filter is to reduce an extra light factor
Viewing now from the front side
With some imagination, the observer is looking through the ocular and it seeing the 50 % transparent mirror. To my understanding, the transparency is necessary as to allow checking the correct position of the air bubble in its centre
The brief instructions (Kurze Bedienungsanweisung)
The battery adapter not yet inserted. I guess it replaced a kind of model C- dry battery cell, but now being powered from the 24 V DC of the aircraft battery
Battery adapter put in place
Shown is the right hand-side of the Libellen-Oktant
I have to apologize for being a layman in the field of celestial navigation.
We would be very pleased when someone is capable of helping us to understand this nice and interesting apparatus. Maybe even providing us a manual copy (of course, with full credit!)
Please contact us at:
Please type in what you read.
On the same day I also took some photos of our UKWE d1, which I might have swopped with Ebbe Pedersen in the 1970s
U.K.W.E.d1 Special tank receiver.
Ultrakurzwellen-Empfänger d1 (42.1 - 47.8 MHz)
Serial number 3636, year 1943
There existed also a type d, but the d1 version, I guess, is an improved type and used already existing FuG17 techniques. The module now being wired for 12 V instead of 24 V operation.
For experts it is clear that the receiver module is derived from the in huge quantities produced FuG16/17 series
The rectangular empty hole in the rear panel of the receiver is originally used for the power connector of FuG16/17 system.
We are looking at the IF section of the receiver module. It is being build in a typical sound Lorenz manner!
On 24 May 2011 we added some photos
Which actually had been taken some time ago, but I felt not yet free in putting it on the web, as it might have been part of a swop offer. This has now successfully been settled in another way. This mint apparatus is already in our possession since late 1980s.
PQK2 with closed lid
Werk-Nr. 95067 - 38 (Production serial number; year 1938)
Anf.Z. Fl26816 (Early GAF stock number)
The red stamped 'BAL 181' stands for: Bauaufsicht Luftwaffe. The number '181' belongs to the one who accepted the apparatus. This practice changed during the war, but was reintroduced about 1944. Spare Parts and Provisioning in the GAF
PQK2 front panel
The calibration table is attached at it. It covered two ranges one for long wave and one for the short wave. (FuG III and FuG 10)
PQK2 from inside
Shown is a typical 1930s kind of construction. Both valves are type RE 074, actually a bit out dated. I guess, that the construction, although of 1938 is going back to about 1934/35 maybe even earlier.
The 'Quartz' (Quarz) is of the so-called luminous type. It is covered to a great extent as to keep day-light away from the luminous phenomenon. Please notice our other contribution in this field. Luminous Quarz and Leuchtquartz
It incorporates a quartz stage a detector as well as an audio amplifier as to listen into local signals (and interfering with it as to create beat tones)
Most German wave meters are acting as signal source and can also act as local signal receiver. Beat tones can then be listened onto by means of a headphone set. I guess it is in some respect comparable to BC121 and its derivates.
Seetakt first local oscillator module
Please notice the printed (silvered) coil inductance.
I don't know the meaning of 34 - 54,5. MHz? Normally Seetakt operated about say 380 MHz, which is optically in accordance with the size of the tuned circuit. The 'acorn' valves, although, originating from the U.S., were mainly produced by Philips Eindhoven in the Netherlands. They made nearly all European (2 V) 4 and 6 volt series. After Eindhoven was liberated in the third week of September 1944, the Germans suffered from vanishing stocks. Please notice the typical Gema component numbering within the red circles ('10' and '110'). It is clear that this tuning principle is basically employable in a variety of cases. Its advantage is that tuning is contactless, thus the nuisance of joint-oxidation is entirely prevented. A butterfly capacitor is having at higher frequencies a too high Co capacitance. Also its physical dimension (and wiring) is a downside, as it is at least reducing system stability.
Viewed from a bit different perspective. The dielectric disk is now just entering the capacitor (tuning) slit
The dielectric disk is the tuning component (device)
Shown is the tuning principle of this oscillator module
I trust that this drawing is self-explaining. During my long-time patent research, I came across an American (GE) as well as a patent on behalf of AEG. I guess, that the basic idea goes back to an American priority, somewhere of the early 1930s. GE and AEG had strong mutual patent agreements; and one is never sure of whom might have claimed its priority.
Please notice, that the relatively small components shown at our 'Rariteitencabinet' has been moved, on 14 June 2011, to a newly created webpage called: Components display
As these component photos were a heavy load for this page, which should be dedicated to bigger items like modules.
Please continue with Exhibits details page 3
Please notice also our: Exhibits details page 1
Please continue, or proceed with: Exhibits details page 3
Please consider also our new Würzburg repairing survey: Wurzburg report
Concider also, or go back to: Archive displays
Consider also, or proceed with: Exhibits registration
Back to: Exhibits new