Friday Projects Page

 

Page initiated 30 November 2024

Current Status: 21 December 2024

AOB:

We are maintaining about half a year a dedicated Friday group,

engaged with various subjects

Of whom: Eric, Ambro, Hans Goulooze, Anton and myself (AOB)

being engaged on various particular subjects.

Albeit, that we are not every Friday being committed to exactly the same subject.

 

Project number:

1.    Friday: 29 November 2024 (On 2 December, I added the hyperlink to access the manual of the KWE-a receiver:  https://www.cdvandt.org/KWE-a.pdf )

2.    Friday: 08 December 2024

3.    Friday  16 December 2024

4   Friday   20 December 20243

5   Friday   27 December 2024 (published 28 December)

6   Friday  3 January 2025  (published 5 January 2025)

7   Friday  10 January 2025 (published 13 January 2025)

8   Friday  17 January 2025   (published 20 January 2025) (published with additional information (photo/schematic 10a) on 21 January 2025)

 

Photo 1

Eric is currently particularly engaged in the mechanical Zerhacker/vibrators; on the far right-hand side we notice a genuine Zerhacker which still, gather rarely, fully functions

On the far left-hand side we notice Ambro's experimental solution in respect to Marc Simons's electronic Zerhacker/vibrator substitute circuitry.

 

Photo 2

The selector-switch should later allowing at will to select: either the Feldfunk-vibrator which circuitry differs quite much with the regular employed techniques as well as, for instance, the technique employed within the EW-b Zerhacker-Satz

 

Photo 3

Viewing it from a slightly different perspective

 

Photo 4

No further comments

 

Photo 5

Eric took lavishly photos today

 

Photo 6

As to get access to the band-switching mechanism the: the die-cast front-cover plate has to be demounted

 

Photo 7

WD 40 did make the switching mechanism operating again, without heavy force; I asked Anton to de-mound a cover-plate as to get access to the ingenious switching-contact-fingers

which just rub the coil-contacts for about 0.1 mm as to keep them clean

After all, this wasn't that easy as I had thought.

 

Photo 8

With some slight force Anton managed to remove the according cover plate.

Isn't it a mechanical beauty after say 82 years?

Please consider toward the end of this chapter the according schematic

 

Photo 10

Anton in due action

 

Photo 11

Removing the cover-plate and replacing it, proved after all that the cover-plate had to be re-adjusted slightly

 

Photo 13

Ambro is trying to become acquainted with our automatic Fluke oscilloscope, which he didn't yet well appreciated

 

Photo 14

Eric took this photo and it is quite well reflecting our busy engagements

All doing their own jobs.

Eric was this time taking some photographs, as I (AOB) was doing too

 

 

Photo 16

AOB: I love the beauty of the mechanisms

For its integral manual:

https://www.cdvandt.org/KWE-a.pdf

Please notice the many schematics towards the end of this manual.

 

Some mp4 films taken by Eric

 

https://www.cdvandt.org/mp4/Friday-1-self-cleaning-of-the-KWE-a- contacts-1.mp4

https://www.cdvandt.org/mp4/Friday-1-self-cleaning of the-KWE-a-contacts-2.mp4

https://www.cdvandt.org/mp4/Friday-1-self-cleaning-of-the KWE-a-contacts-3.mp4

 

 

Photo 17

Eric, Ambro and my wife Karin were gathering - as to discuss legal matters, in respect to our endeavour to extent our legal

status into an ANBI Foundation (Entity).

This mainly concerns strict legal matters;

and these have to be anticipated upon before

our new legal ANBI status may be successfully applied fore.

 

(2)   08 December 2024

 

Photo 1

The various legal matters to be cleared to the new and future ANBI board members

is to much concern of my wife Karin, as well as to Ambro and Eric whom (the latter) is already a Board member of our current Foundation Stg. C.D.V.&T. '20-'45

Albeit that I am their current chairman, I am not too often engaged in their deliberations.

Organisational matters are, generally, not favoured doings.

Luckily some can accomplish such a job much far better than I can manage.  

 

Photo 2

During our reshuffling arrangements this morning in the MLK Archives, one of Eric's eyes touched a crate filled up with all sorts of mobile telephone gear

In my perception, these were mainly originating from Scandinavian origin, but adapted with sometimes German gear attached onto it.

 

Photo 3

Considering it from a different perspective

 

Photo 4

The K4 Magnetophon rested here from about early June, and time has come now to place it again in its case and mounting it properly

 

Photo 5

The K 4 Magnetophon (introduced by AEG in 1938) should be tilted a bit in the rear as to realise a better vision at the tape-deck 

 

Photo 6

Last Monday morning my wife Karin a myself brought in the new working-space for Ambro, which we bought about a decade ago, and should be Ambro's new working table

In the background we notice a similar table type, but that one is Hans' Goulooze's one

It is clearly visible that these tables allow better desk sitting than the substantially higher former display tables.

 

Photo 7

Quite often is one contact pair resisting proper cleaning; though persistency is demanded, because finally also this contact pair can be cleaned appropriately

 

Photo 8

Ambro has become rather happy (at least that is what he told me) with the start of his new workspace

I would like to provide full freedom in creating "his layout" of all the according tools and related gear Think of his handsome access to screw-drivers and that like.

From experience I know, that gauziness is someone's private matter.

 

Photo 9

Eric is is testing his recently cleaned vibrator (Zerhacker Pack) The left-hand site

 

Photo 10

The left-hand site is solely containing gear (components) belonging to the 20er Klappenschrank

 

Photo 11

Also this crate is containing only 20 line Klappenschrank related devices

 

Photo 12

I haven't been told yet, but I suppose the state of the tag-soldering are indicating that we are looking at the pre-phase of dismantling the critical electrolytic capacitor-block  

 

Photo 13

It has been decided to restore the set of late PA 0 GAD and using as as a test set

This might causing some difficulties because of there is something missing;  as there exists a cable with an open end.

 

Photo 14

Eric is getting quite some experience in make the genuine German Zerhacker /vibrator running again stable and reliable

 

Photo 15

It is always debatable whether one should remove the 100% faulty electrolytic capacitors

In my perception, the electrolytic substance often borax related might causing damage.

But more relevant is the query do we want to operate the set reliably again?

When this is the way it should be accomplished, there is no way around that fitting better quality electrolytic capacitors inside the box.

I would prefer to wire the replacing electrolytic capacitors parallel outside, but the rather compactly built set does not allow doing so.

 

Photo 16

Ambro is holding the demounted power-supply in his hand

Its rather compactness is striking!

 

Photo 17

This is the capacitor-block fit with a new arrangement of electrolytic capacitors

The main function of this arrangement is, to store the resulting HT voltage of the voltage doubling circuitry.

 

Photo 18

Measuring parameters is always an interesting state of affairs

 

Photo 19

Compactness and clean engineering are one of the striking features of German sets

At least up to the end of about 1944.

 

Photo 20

A quite impressive gathering of gear

 

Photo 21

The smoothing provision is mainly relying upon the quality of the components (the right-hand side block has been accepted in December 1943

'bpt' (German producer code) once stood for: Telefon- und Telegraphenfabriks A.G.  Kapsch & Söhne,

Wien (Vienna) 87/XII, Johann-Hoffmannplatz

 

Photo 22

Today you witnessed Ambro's and above Eric's commitments

 

 

(3)   16 December 2024

 

Photo 1

With Kontakt-spray 61 I tried to remove the obstructing dirt inside the main on-off switch

I suppose this was successfully accomplished.

 

Photo 2

Ambro's work-bench testing Marc's Zerhacker-Vibrator substitute

 

 

Photo 3

A relay is often hampering, after a while we found that the Philips power supply provided a too low filament voltage; after readjusting the relay does respond well

 

Please view the brief mp4↓

https://www.cdvandt.org/mp4/Friday-proj-feldfu-Eric-relay-proper-functioning-13-12'24.mp4  

 

 

Photo 4

All three valves being inserted and the remaining HT is ca 87 V; seemingly not too bad I suppose (operating a genuine repaired Zerhacker/vibrator)

 

AOB: trying to operate it by means of a hand-held microphone (no antenna being connected)

(in practice, they mainly operated it by means of a throat-microphone)

Photo 5

 

This smoothing block contains now modern type electrolytic capacitors, as these wartime types weren't built in hermetically closed versions

I suppose it is due to a realistic consideration: The not entirely closed-off types lasted longer than the expected life time cycle of a Feldfunk set including its committed soldier.

Photo 6

 

Our Feldfunk apparatus being mounted at a moveable table and place adjacent to the Nachtfee apparatus.

For practical reasons, by the way:

As we necessitate a test signal generator, and ours in the Klooster is mounted in the test-rack underneath the Nachtfee Console

Photo 7

 

Our SMS signal generator

Please notice: that we have to test the Feldfunk receiver with an amplitude modulated signal

Photo 8

 

On demand of Eric, whom received a reply from a museum in Tokyo about additional photos of our Berlin PPI display.

The German apparatus was derived from a British captured radar system in a Stirling bomber over Hardingsveld-Giesendam near to Rotterdam.

The Germans called the British H2S apparatus therefore "Rotterdam Gerät".

 

 

The Berlin radar PPI

The main difference is: that the Germans used the module horizontally whereas the British operated the PPI vertically (thus rotated - 90°)

Photo 9

 

Within its genuine box we possess the genuine Berlin wave meter

in its genuine transport case including the Eichkurven Büchlein (calibartion booklet)

Photo 10

 

Photo 11

Feld I we possess and is represented in the left-hand side block-diagram

Feld II we possess in a kind of acrylic replica; albeit that the lower section is containing two genuine modules; whereas the upper photo is shown in the right-hand side up module section.

Sichtgerät is: PPI

 

On the far left-hand side we notice the Berlin PPI

within the metal frame encounter Feld I providing:

distance or range cycles

IF stages

On the far right-hand side the various "pulses providing sections"

Down on the far richt-hand side two genuine modules, please notice the foregoing block schematic of Feld II

And in the upper section we notice the transmitter symbolised by the genuine component, placed where it originally once had been mounted.

The genuine British design operated with quite a group of subunits, whereas the Germans bundled the various functions, within two main frames only.

Photo 12

 

The US number being: CEE 19338 in red choke (CEE = Captured Equipment Enemy)

Photo 13

 

Viewing it a bit from inside

Photo 14

The upper replica section mounted and fixed by screws about the centre is the German copy (LMS 10) of the British CV 64 magnetron in between the upper and lower section

All components displayed being genuine wartime.

In the lowest compartment we notice the pulsing stage to the trigitron (spark-tube) and stages within Feld I

I constructed this acrylic stage as the chance obtaining a genuine Feld II is considered 0%

Photo 15

 

Viewing the PPI unit from the left-hand side

and

viewing at the connectors.

Photo 16

The coaxial heavy type is the local oscillator output generated by the Rd2md2 magnetron type.

its signal is fed onto the first HF stage which output is constituting the Berlin radar IF signal.

The far left hand side are constituting the low frequency signals including the power connections

The two circular connectors right of the heavy coaxial connector containing video signals.

By the way: these connectors being of most rare types.

AOB: for more details please consider:

 

https://www.cdvandt.org/fug224-prueffeld.htm  

and

https://www.cdvandt.org/berlin-radar_survey.htm

 

 

 

(4)   22 December 2024

 

Photo 1

Today we collected our stock of spare valves:

RV 2,4P700, RL2,4T1 (triode also receiver audion (genuinely: Amstrong's sensitive detector concept, up to direct detection at UHF and, maybe, beyond) valve as well as the transmitter valve, and the audio modulator amplifier valve.

 

 

Photo 2

Viewing inside the Feldfunk type b set

 

 

Photo 3

Viewing this beautifully built set a bit differently

But compact it certainly is.

 

Photo 4

The cylindrically shaped NSF electrolytic capacitor possesses a capacity of 1500 µF (C 15) is hermetically sealed off

It has proved, that these wonderful electrolytic capacitors can still be reactivated (in Dutch language called: formeren). It takes some time when we started a leakage current was measured of 20 mA; tendency lowering after some hours  the leakage current has reduced to: 863 µA

When we stopped that day at about 16.30 - it had reduced much more. Though, this process had to be continued.

 

Photo 4a

The max. voltage may not exceed 6 V but the Ni-Cd battery delivers only 2.4 V let it be with over-charging be 3 V, than there still is no danger to be expected.

Please consider: that the electrolytic capacitor is aged ca. 82 years!

 

Photo 5

Again returning to Eric's beautiful set:

Next was tried to get an impression of the state of the non-hermetically sealed-off electrolytic block of capacitors.

Here we encountered the to be expected dc current leakage.

 

Photo 6

Insulation test, which indicated that these capacitors being faulty

 

Photo 7

In all German wartime concepts '0' means ground which in almost all cases implying a direct connection onto ground

'6' is constituting the 2.4 V filament supply line.

(For it the ES (Eisen-Wasserstoff (iron-hydrogen) barrater bulb being disconnected firstly)

The cylinder marked Ü 1 (Übertrager 1) is containing an audio transformer arrangement.

 

Photo 9a

From left to the right:

Ambro, Anton, Hans Goulooze, myself (AOB) and Eric

Photo taken by my wife Karin.

 

Photo 10

Eric's inside beautiful Feldfunk type b

Year of manufacture 1942

Coded serial number: 032328

On the right-hand side the cover and the dual dc levels indicating neon bulb; which will be the subjects of next photos:

 

Photo 11

From left to the right: the two neon test-bulb connections

The actual test-bulb

on the far right-hand side its cover with testing knob on the down-side of the Bakelite cover.

 

Photo 12

Down: Sammlerbereitstellung

up: Spannung normal

 

Photo 13

An brief impression of the neon test bulb fixed by spring-loaded contacts

 

Photo 14

An example how one of the indications do look like

 

Photo 15

Thee examples of what can be indicated:

No test accomplished

Indicating that the battery being charged at least sufficient

On the far right-hand side: the operational supply is generating an increased loaded voltage

 

Photo 16

The test bulb is not as good as the second sample

 

Photo 17

Best bulb tested

The neon glowing around around the electrodes looks quite soundly.

 

Photo 18

Ambro is preparing the late PA 0 GAD set for a power test under realistic conditions; though without an antenna connected

 

Photo 19

Just towards us we notice the regular Wehrmacht microphone module

carrying the obligatory: 'Feind hört mit' warning.

 

Photo 20

For this occasion, he is operating a genuine, but contact cleaned Zerhacker (vibrator) module

One of his aims: is to compare the genuine Zerhacker unit with Marc's electronic vibrator substitute.

Factually there are some differences, but if we consider the voltage drop across the two 'keep alive' protecting diodes than the difference isn't that much.

 

Photo 21

C 15 is the ominous 1500 µF hermetically sealed-off electrolytic capacitor

 

Photo 22

Now Ambro removed the genuine 2.4 Zerkacker and inserted Marc's electronic vibrator substitute module

 

Photo 23

Ambro probably is preparing for fist operating like tests

 

Photo 24

This Feldfunk set is ready for its first tests

Genuine valves being inserted and Marc's vibrator substitute being installed (inserted)

Ambro promised to write a report on his current measurements.

 

Photo 25

These tests being accomplished without any antenna connection

 

mp4 film:

https://www.cdvandt.org/mp4/Friday-proj-4-dd-GAD-set-mike-tx-test1.mp4 

 

 

 

(5)   (published 28 December)

Today, in the Christmas holidays period in Europe, at least Eric had family obligations and the starting time was also later than we are used to.

 

 

Photo 1

Anton ordered 8 heavy wheels, as to replace of deteriorated ones

Not always an easy endeavour, as the wheels visible by the public, but the ones invisible at least necessitate a replacement of the rear ones of ca. 50 cm or even more.

But these defect wheels do not easily allow a sufficient movement; as the wheels aren't possessing any longer a flat surface.  

 

Photo 2

The brown remains being broken off of the old wheels functioning since about 1993

It is quite easy to understand that the surface of the genuine wheels do not provide ideal rolling around with quite heavy apparatus.

Of which the power-supply weights ca. 500 kG and the transmitter about 750 to 800 kg!

 

Photo 3

The two wheels in front weren't difficult to replace, be the two ones between the wall and the power supply might constitute a nuisance

 

Photo 4

Considering it a bit differently

 

Photo 5

Ambro is considering the Zerhacker/vibrator substitute solid state on in conjunction with EW-b power supply

Suddenly its input current consumption rose to >3A!

We must admit, that it repeated ca. 3 times this way.

But various experiments have to follow and often without this ill current consumption (> 3A at 2.4 V battery supply)

 

Photo 6

Seemingly it does function correctly, but we do not fully trust matters as we encounter current consumptions exceeding 3 A!

 

Photo 7

During the range of experiments, Ambro went back to his early Feldfunk experimental power supply

 

Photo 8

Ambro was time and again repeating measurements as to discover what sometimes is causing ill current consumptions

 

Photo 9

Ambro considered 0.89 A loaded current consumption a being reasonable

 

Photo 10

In conjunction with the EW-b Ambro encountered sometimes an ill current consumption of >3A

But it proved yet being impossible to discover why this outrageous current consumption does occur.

 

Photo 11

The EW-b Zerhacker/vibrator module being loaded by 10 mA a current which is to be expected in conjunction with a TornE-b receiver

 

(6)    (published 5 January 2025)

Photo 1

On 1st January 2025, Marc and Paul did meet Eric for the first time at our home

Thereafter we went to the Klooster premises

where I explained our new reshuffling plans as well as Ambro's lab-table

Marc dropped three samples of his substitute electronic Zerhacker/Vibrator modules.

 

Photo 2

This photo is quite self-explaining

(Marc is sitting at Ambro's desk)

 

Photo 3

Today Anton managed to exchange the last numbera of all the 8 rugged wheels - as to allow easy moving of the transmitter and power-supply of this transmitter again

 

Photo 4

Anton is factually using 3 different types of cracks (named in Holland a 'krik') as to cope with the various spaces between the ground and the lowest apparatus levels above the floor

 

Photo 5

Anton is manipulating with his left hand the lowest level red coloured lever-rod

 

Photo 6

Anton is now committed with rear-left-hand side wheel; please bear in mind that this unit weights: ca. 550 kg (just over ½ ton!)

 

Photo 7 (8a)

The last wheel/roller to be replaced

I suppose also the best way to notice the new state of affairs

 

Photo 9a

All 8 new roller/wheels have been mounted

By the way: Anton possesses a general penchant for cracks and that like.

 

Photo 10a

This is a good opportunity as to get an impression what, it is about inside

At least since about 1983/84 never done, the power-supply is operating as does the transmitter currently.

General rule: keep your both hands inside your pockets!

 

Photo 11a

Considering it from a slightly different position

 

Photo 12a

(AOB the letter 'a' has been supplemented for practical reasons)

I cannot remember when I operated it with an opened power-supply and a having removed transmitter security cover-pate for the last time.

 

Photo 13a

The work on replacing the roller/wheels is completed

Of course, thanks Anton's committments.

Not to forget the dedication of the company delivering the genuine roller/wheel replacements.

When I bought those about 1994/95, a Dutch company charged me about ƒ 1000 (454 Euros) whereas replacing the wheels currently, it has to be admitted without the movable mountings, did cost us recently ca. 150 Euros only; maybe Anton managed to get some additional discount.

 

Photos 14a 

Ambro is explaining Eric the current circuitry details of the EW-b power supply module

 

Photo 15a

The EW-b finesses are also 'new' for Ambro

On Sunday 6th January Ambro added:

Ambro and Eric were working on Eric's EW-b. Last week it was tried with the electromechanical vibrator (EMV) and Marc's solid-state vibrator. The output high tension was OK with both vibrators. So, the EW-b unit and the vibrators were working.
But they noticed an unexpectedly high current draw from the supply.
Today they first measured the current draw of the vibrators itself, both being 80 - 90 mA without a load.
The EW-b with the EMV without a load drew about 800 - 900 mA from the supply of 2,4V.
On the secondary (HT) side of the transformer there are three 80 years old electrolytic capacitors. Disconnecting them had the effect that the current draw on the primary side sank to 300 mA. That may still be too high, so next week we will investigate other possible current leaks.

 

 

It is visible that our established Friday projects days, are dealing with various subjects of our lively hobby.

 

Photo 16a

Eric is a dedicated student, as the current 'metier' is not well familiar to him

 

Photo 17a

You are looking at, from left to the right-hand side:

A Telefunken wartime civilian radio:  next under an ER1a - a Wehrmacht broadcast receiver, but facilitated with a BFO

On top of it we notice a simple loudspeaker, and a "Volksempfänger".

A Philips broadcast receiver made for the Wehrmacht fit with '25' loctal-base valve series

Most on the right: a Wehrmacht Rundfunk Empfänger; there existed two versions: WR 1 P (equipped with Philips '25 series loctal-base valve series and WR 1 T (Telefunken fit with so-called Stahlröhren) the latter valve types concerns our receiver.

AOB: By the way, it has to be noticed that the Philips loctal base design, that the civilian socket base must be regarded constituting one of the poorest designs ever!!!  Those 'idiots' designed a pin-contact which is touching about 01mm x 01 mm of conductive (silvered = oxidation) material only! 

 

Eric arranged the radios stand around in our 'front' space/room which room we would like to convert into an utility venue.

Where we keep a small library and a space where our 'schematics' will be stored at about 1 m height; as we are located in a 'polder' area located some meters below 'sea level'.

Now the schematics being stored above the museum ground level, and now we have the opportunity to raze it upwards for about one metre.

Sounds being not too much, but under dangerous circumstances this can just making an essential difference.

Whether these radios will remain here or will put elsewhere in storage we don't know yet.

 

Photo 18a

Considering it from an artistic perspective

 

Photo 19a

It is quite evident, that changing the way this space being used does really make sense 

 

Photo 20a

No further comment

But I prefer to keep using crates for storage related items, as, in my perception, storage in crates is most efficient compared to employing shelves.

 

Photo 21a

I tend for a shelves like construction covering most of the left-hand side wall.

Consequently, some (2½) of the bureaus have to be removed (donated to someone).

 

Photo 22a

Some impression of Anton and myself apparently in a discussion

 

Photo 24a

Considering the roller/wheel we are viewing at a photo taken during the earlier hours of today

 

Photo 26a

Always: - what the Germans call: eine "Augenweide"

Isn't a beautifully constructed device?

This is more than a power-supply utility.

 

Photo 28a

Three light bulbs are functioning as a dummy-load

When the Morse-key is down: the RS 329 anodes are glowing more of less red.

 

Photo 29a

Providing a vision upon the currently not (yet) operating transmission (7140 kHz) status

 

Photo 30a

AOB: I myself admire these kinds of photographs!

 

Photo 32a

"In German language I would say: "Ich bin Sprachlos"

What a beautiful picture Eric took!

 

Photo 33 (actually 43a)

A bit psychedelic photo,

Eric's camera apparently could not cope well with the existing colour-spectrum; but it, nevertheless, works optically!

.mp4 films taken by Eric

1. https://www.cdvandt.org/mp4/film-4-swiss-1kw-1.mp4

2. https://www.cdvandt.org/mp4/film-4-swiss-1kw-2.mp4

3. https://www.cdvandt.org/mp4/film-4-swiss-1kw-3.mp4

4. https://www.cdvandt.org/mp4/film-4-swiss-1kw-4.mp4      

 

 

 

(7)    (published 13 January 2025)

Due to an omission, I did leave behind my SSD card at the Klooster premises.

But Eric provided about 47 photos, albeit of a different nature: showing the state of the current events in our premises.

 

Photo 1

This is our current state of affairs in the Depot space

Ton Brongeest, our carpenter friend whom may use this back-room for free, he will making soon space for our new endeavour; emptying all and is then making room for insulating it as to get rid of the outside cold temperatures.

It all started about spring 2012 for Ton; whom was in a great need.

 Ambro offered my wife Karin to insulate according his plans.

 

Photo 2

I don't know what Ton actually is doing and/or is planning

 

Photo3

Council of Amsterdam has declared recently: that the City Zones will become "Emission free" from 1 January 2025, and as Ton was driving a business van on Diesel of an elderly age, he has to get rid of his old business car

Apparently he found someone outside Amsterdam whom is willing to by his car.

Though, Ton used his business van, partially as a storage place as well and he had to clear the car from all his tools and materials stored inside.

Therefore he warned us what additional space he, temporarily, has to occupy.

 

Photo 4

Viewing underneath the place where currently the Radione station RS20M and R3 set being displayed

From left towards the right-hand side: The Schwabenland RX albeit without it genuine case; adjacent to it the 'Feldverstärkertype  a' (a two way dual wire telephone repeater) which is a field amplifier capable of operating into two directions.

The old 1932 tropical set, once designated for an Amazon expedition.

Utilising gold plated wires and coils

https://www.cdvandt.org/images18/Eh-replacing-12-1'23-p26.jpg

and

https://www.cdvandt.org/images18/Eh-replacing-12-1'23-p20x.jpg

The black unit with a CRT is, what I recognised as a 4 quadrant LF (I measured > 30 kHz) frequency measurement apparatus.

Unkown is in what context and how the genuine system did operate.

https://www.cdvandt.org/exh-details-42.htm

 

Photo 5

The tall set on the left-hand side is the standard S 406 S transmitter equipped in 'Type VII' submarines

(see later)

About the centre we notice the Main receiver officially designate T9FK39

A rare receiver type:

But in the late 1970s a German dealer explained to me: keep you hand off these kinds of receivers.

He was write, as in most cases the band-switch will be blocked by some rubbish and the individual band switches (Bakelite) will brake mechanically down!

On the far right-hand side we notice our AS 90 transmitter, which I operated in the last few years of 1980s.

I like this set, but I am currently relying on the T200FK 39a transmitter.

https://www.cdvandt.org/t_200_fk_39.htm

and

https://www.cdvandt.org/T200FK39%20Handbuch%20Abstrakt.pdf

 

Photo 6

The module with the moving-coil meter constitutes the AS 59 power-supply

On top of the AS 59 power-supply we notice the Telefunken 'Brotkiste' A device I don't like myself.

 

Photo 7

From left to the right: Up the Abwehr RX type IV (is like an HRO RX employing inter-changeable coil-bock units

The brown wooden case constitutes a Siemens 1915 wave meter test set.

https://www.cdvandt.org/exh-details-41-kgw2c.htm

on the far right-hand side

https://www.cdvandt.org/t8pl39.htm

In between the wooden box and the Lo6K39 we notice the Schwabenland receiver

https://www.cdvandt.org/schwabenland-survey.htm

and

https://www.cdvandt.org/D-Luft-T-4415-Kurzwellenempf-Ln-21021.pdf

and

https://www.cdvandt.org/Schwabenland-HB.pdf

 

About the centre we notice the Lorenz EO 509

A quite curious receiver

https://www.cdvandt.org/EO509%20innen-0.jpg

Photo once taken at our former PP Archive before 2008

 

 

Photo 8

Looking at the complete Radione Wireless station

On the lefthand side the RS20M transmitter; more in from on the right-hand side the Radio R 3 RX

Please notice also the two hyperlinks below (sets operating!):

https://www.cdvandt.org/exh-det-36-rs20m.htm

and

https://www.cdvandt.org/exh-det-36a-radione-r3.htm

 

 

Photo 9

Viewing the front panel of the Radione transmitter type RS 20M

 

Photo 10

About the the late 1940 OM Metzelaar especially constructed a sound and nice looking spare-part box to this Radione W/T station

 

Photo 11

Viewing at the Radione R3 receiver within its genuine suitcase

 

Photo 12

The S 406S the standard Submarine Type VI boat transmitter

For quite many years I operated this transmitter as my standard Hell-mode transmitter.

 

https://www.cdvandt.org/Kl-S406-VFO-0.jpg

 

Photo 13

Two time RS 291 valves in the transmitter PA stage.

Output ca. 200 W HF and a rather stable VFO of the Push-Push type.

 

Photo 14

https://www.cdvandt.org/exhibits-details-21.htm

The Lo6K39 (right-hand side) and left of it the Lo6L39 receivers, the left-hand side mounting frame is entirely genuine, whereas the right-hand side sample is lacking the genuine sockets, though both full-fil their duties.

 

 

Photo 15

The pulled-out frame is to allow access to the valves under moving circumstances

 

 

Photo 16

Peiler type Martin T8PL 39

this receiver has been modified, doubtless, at Telefunken.

As two wave-band have been added and Band 1 and II had been removed.

Though, the scale-engraving  was accomplished so perfectly that only this could only have been accomplished at Telefunken or related work-shops.

https://www.cdvandt.org/t8pl39.htm

 

 

Photo 17

Please compare the outer and the inner scale, then it becomes clear the the inside engraving is accomplished in a clear and perfect manner

 

Photo 19

A quartz crystal box especially employed in combination with the Radio transmitter type RS 20M

 

Photo 20

Considering it more in details

The Radio quartz-crystals were of the more flat made types, as by their means the front-door can be locked easily.

 

Photo 21

Tomorrow the 12th we hope to make a new mp4 film recording as to show some of the KWE-a capabilities

 

 

Photo 22

The NA 6a power supply in particularly manufactured as to operate in conjunction with a LWE-a or alternatively KWE-a

The cable and plugs are genuine, actually of a uniform type.

A screw is determining whether it should be operated in conjunction as a receiver or a transmitter.

 

Photo 23

Werknummer (schematic drawing number Ln 27466-1)

bou = Telefunken

 

Photo 24

This constitutes my safety circuitry:

The switch set in this possession, indicates that the AC current-flow is less than this 40 W light bulb allows.

When the apparatus is suffering from a fill circuit fault it would burn fully at 230 V; which it now does not.

Rood aan means that the red colour of the switch in front is set that way, that the light bulb is short circuited and the apparatus under test is now fully powered by the mains supply

 

Photo 25

Testing whether the filament supply is about 2.1 V which it is about

 

Photo 26

The loaded filament supply is now 2,194 V

 

Photo 27

Which should be considered as being sufficient

All information being provided soundly, in my perception.

 

Photo 28

From left to right: RS 55 I; RS 21IV

CRT: HR 1/100/1,5

Crt: HR 2/100/1,5

STV

 

Photo 29

But nice are they.

I suppose originating from the 1920s, thus designed about 100 years ago.

D.R.P. = Deutsches Reichspatent.

 

Photo 30

Above the single beam version (HR 1/100/1,5) of the lower dual beam CRT

 

Photo 31

The Telefunken single-beam CRT HR 1/100/1,5

 

Photo 32

The clean (clear) front section lacking 'aquadag' screening is an invention by AEG as to allow project symbols but mostly vertical line as timing reference

Please notice: https://www.cdvandt.org/exhibits-detais-17a.htm

 

Photo 33

Isn't it a beautiful construction?

Both beam sides are totally equal end operating every CRT electrically dual, thus also being fit with 2 sets of 4 deflection-plates.

 

Photo 35

AOB: I don't know the particular meanings of the symbols

Albeit that J. (= i) might have stood for a current flow.

 

 

Photo 36

The CRT on top of the Nachtfee Console is of equal type as is build-in our Nachtfee Console

Albeit the the CRT on to is not provided with a 'plan' CRT screen, whereas we employ a flat-screen (P) type. HRP 2/100/... versus HR 2/100/...

For our application in conjunction with Nachtfee a plans-screen is not directly necessary.

 

Photo 37

Now a different scene:

On the left-hand side Eric's Funksprech f but being fit with a likely not genuine front plate, whereas the right-hand set is in this respect genuine.

Though, after due considerations, it would demand enormous efforts and not bringing too much advantage.

 

Photo 38

Viewing both sets from a slight different perspective

 

Photo 39

Viewing at the broken-off handle of the main on-off switch; which could be operated as long as it was set about its middle position.

a new approach on Erics EW-b Zerhacker/vibrator unit as to get rid of leaking values of the wartime electrolytic capacitors

These in particular failed when being operated by means of the dynamic (mechanical and/or electronic substitute) vibrators.

 

Photo 40

A German slotted line, considering its length used in particular at lower frequencies

My guess about the Freya and Mammut radar spectrum (ca 110 - 150 MHz) Thus not in what became known as 'micro waves'.

 

Photo 41

The carriage is to be handle with great care as the load spring is made of flexible glass

 

Photo 42

A mechanical 2.4.V Zerhacker/vibrator unit

Eric has got quite good experience and most Zerhacker modules passing through Eric's hands are functioning well again, afterwards.

 

Photo 43

Without the exception of ours, I never have seen such a huge slotted-line device

 

Photo 44

Towards the conclusion of today's photographic series a bit chaotic:

Ambro did disconnect the HT contacts of the hermetically sealed-off capacitors and replaced them temporarily with modern type ones. As to measure and getting an impression of the different current values and the over-all dc current consumption.

The main aim now is, to test matters. When we decide to finish our experiments, all genuine capacitors can return at their genuine position again.

 

mp4 film:

https://www.cdvandt.org/mp4/KWE-a-dd-12-1'24.mp4

Please excuse us, that the receiving conditions, at our location, are quite inferior; and nowadays there is during the morning hours (ca. 11.15) hours hardly any signal to receive in the medium wave band.  The interference due to the wide spread applications of wifi and/or switched power supplies etc. - are making sound reception rather difficult.

 

 

(8)    (published 20 January 2025)  (Pse notice photo/schematic 10a)

On 17 January 2025

 

Photo 1

After quite some considerations, we mutually came to the solution maintaining some of the existing bureaus, whereas we planned for a completely new structure

Our new book shelves should, Deo volente been build in between the two outside schematic storage places  

 

 

Photo 2

As I noticed about our first photo, that we consider a variety of options

of which, you see some sketchy drawings.

That we finally agreed to a new integration of existing and newly designed inventory was mainly due to the rather many discussions accomplished.

 

What is highly annoying me is the downside of our current NOD 32 anti-virus program.

They design anti-virus programs, but these creatures do ignore that  someone may prefer in complicated designs to keep open some storage spaces. And they delete, without asking folders inclusive their contents.

My only way out being: keeping my virus scanner NOD 32 as long as I do not restart my machine. And this I am forced to maintain as I necessitate more room for designing websites and web-pages.

 

Photo 3

Ambro and Eric both are bound to their mechanical Zerhacker/Vibrator, as to get them running operationally well

Eric decided to modify his sample with modern smoothing components

whereas mines is to be kept in a genuine state.

I suppose, nowadays is does make sense, to keep artefacts as genuine as possible.

 

Photo 4

Nowadays 16 µF isn't a regular value the range jumps fro 8 µF to 22 µF, this is the reason why we prefer to employ 22 µF electrolytic capacitors

 

Photo 5

It was decided by Eric and Ambro: that they will change the electrolytic capacitors is Eric's EW-b module and keeping mine in a more or less genuine state of affairs.

I myself would likely have decided differently in the old days, though nowadays I prefer to keep artefacts in their genuine state when ever possible.

It has to be noticed though, that I decided differently in the case of our Nachtfee apparatus.

But I do not regret the way we approached Nachtfee since 2011; as only by this means we have been able to unravel the hidden magic secrets of Nachtfee. As the only way possessed was to access  approach the line of: "reversed engineering"; which took me about a decade to come!

 

Photo 6

Viewing it from a slightly different perspective

 

 

Photo 7

Two different components of 40 µF and 16µF being replaced by modern components

 

Photo 8

47 µF replacing the 40 µF electrolytic capacitor

 

Photo 9

On the left-hand side: we notice the superb running Motorsatz L C1 and adjacent, on the right-hand side we encounter the GG 400 Motorsatz (providing 12.6 V 400 W ) equivalent to about 32 A charging capability; by means of a two-stroke engine; incorporating dyna-start as well)

Our Motorsatz L C1 was particularly employed in combination with the 100 Ws transmitter station, providing 1000 V as well as the 10.5 V filament supply.

 

KWE-a.

 

Photo 10

C 222 is the capacitance which injects the BFO signal on to the 'audion' or detector circuitry

For technical reasons, its capacitance had to be increase as to increase a favourable mixture (injection) of the BFO signal.

For this reason I added 11 pF which, form experience, already gained about 1961, the BFO to signal ratio improves very favourably.

 

 

 

Photo 10a (schematic)

Please notice C 222 in between the coils 208 and 223

Its nominal capacitance had been calculated in such a way, that the BFO signal (2.Überlagerer) is lower than that of receiver-noise.

It has proved already, for me already in late 1961, that it is favourable to increase the BFO injection voltage.

For today I chose 11 pF, which is increasing the BFO injection about 50%.

 

Photo 11

I (AOB) am soldering currently the additional 11 pF parallel onto the existing C 222 (15 pF)

 

Photo 12

The noise level picked-up from our small indoor antenna increased but still rather minor signals being picked-up

 

Photo 13

German 1939/40 valve tester type RPG 1.

As our KWE-a receiver was used on a display only, due it is untouched shape, there did not was a need for testing the valves.

(On this photo still the RV 12P2000 programming card was inserted)

The RV 2P800 was the standard battery driven (2 V) valve, which possessed a long cycle.

But as the valves were after inspection quite rusty outside, I decided to test the main parameter and the is its, "so-called" Steilheit; in the English speaking area also known as: "mutual conductance" which is expressed in: mA/V (anode current variation versus grid 1 voltage variation.)

Their smart trick being: adjusting the outside meter scale at '0' and now reduce the d.c. grid voltage with -1 V.

The outcome will indicate the Steilheit (mutual conductance) directly from the most outside meter calibration.

For low power valves not relying upon on a certain amount of grid-current this measurement is sufficiently accurate.

Further down I will implement a .mp4 film which shows how the procedure works.

 

Photo 14

Apparently I am searching for the appropriate place for returning the RV 12P2000 programming card

 

Photo 15

The RV 2P800 programming card being inserted

(RV 2P800 stood for: low power amplifier valve;  2 standing for 2 V filament; P stands for pentode and '800' is indicating the static amplification multiplier)

We can read off the essential valve parameters:

- eg to be adjusted  between - 0.5 - 5 V grid voltage to be adjusted by means of the just visible big scale on the far left-hand side.

The black-coloured push-button 'Spannung im Arbeitspunkt'. (by pressing this button, the meter can be adjusted at '0' by means of the black-scale on the far left-hand side.

Thereafter one has to press the white button Steilheit, through keeping the black button pressed down as well.

By dowing so, the G1 voltage reduces 1 V and the meter-pointer will move counter-clockwise. The scale pointer will drop down to say 0.9  mA. This tells us, the the mutual conductance of our RV2P800 under test possesses a Steilheit (mutual conductance) of 0.9 mA/due to the 1 V grid-voltage increase.

The two number related to -eg and S are the most essential parameters of or measurement;  'S' tells us: that the Steilheit or mutual conductance should be greater than >0.5 mA/V.

 

 

Photo15b

When you look a bit closely: you might notice that the meter pointer did rotate a bit anti-clockwise at 0.9 mA thus possessing an S = 0.9 mA/V (mutual conductance)

What I discovered is: that every separate valve under test demands an individual setting as to adapt at scale '0' setting; and their difference being often considerable, but after being adjusted at '0' al parameters respond thereafter similarly!

My conclusion: the '0'setting acts as a kind of feedback and let the device under test responding as if it operates.

 

Photo 16

General impression

 

Photo 17

The Al shielded RV 2P800 was been accepted about June 1944; but the rusty RV 2P800 had been accepted (Acceptance) (Abgenommen) in the fore last week (Christmas) of 1944. (Woche/week 51.1944)

However our KWE-a had been manufactured somewhere in 1941 all valves dated after 1941/42 being most likely changed after the war. As the life cycle of the good manufactured RV 2P800s say before mid 1943, will have lasted the entire rest of the years to come.

Out next move should be selecting 11 good production RV 2P800 samples; testing them and replacing the inferior type currently fit in the so beautiful KWE-a in this article.

The metal screening let it looks like a clumsy valve type; but this is not the case.

AOB: Inside the Al cylinder there are integrated two quite heavy synthetic rubber rings which almost kept their shock-absorption capabilities even after 80 and more years. The Germans relied since the 1930s upon Buna Gummi (synthetic Rubber) which did not suffer from deterioration as do 99.99 of all rubber parts operated by the Allies.      

 

Photo 18

In the centre we see the High-power blind-landing beacon transmitter type AS 4   Relying upon 5 x LS 50 and providing 120 W; sadly we do miss the rest of the system

https://www.cdvandt.org/D-Luft-T-4456-Anflugfuehrungssender%204.pdf

 

 Photo 19

The set on the right-hand side of the AS4 transmitter is our blind-landing test set, which we have modified as to demonstrate what occurs on the L-R meter indicator versus the received signal on the virtual blind-landing signal:

 

https://www.cdvandt.org/fubl_3f.htm

and

https://www.cdvandt.org/fu-bl-fertig-demo.htm

and

https://www.cdvandt.org/fubl-ebl-project.htm

 

 

 Photo 20

Both of our TornE-bs do not function appropriately

In my perception most likely, as these being > 1943 production types, nearly all their non-ceramic capacitors have to be replaced.

But they lacked the time to cure the problem, and next week Eric will bring his TornE-b as well as his well functioning EW-b power supply (providing from 2 V 90V dc as to replace the genuine anode battery-pack.

 

.mp4 films

https://www.cdvandt.org/mp4/KWE-a-dd-17-1'25-1.mp4

https://www.cdvandt.org/mp4/KWE-a-dd-17-1'25-2.mp4

https://www.cdvandt.org/mp4/KWE-a-dd-17-1'25-3.mp4

and

https://www.cdvandt.org/mp4/RPG-1-dd-17-1'25.mp4

To be continued in due course

 

 

By Arthur O. Bauer

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