Two unknown modules

A few weeks ago I obtained two mystic modules from a German collector

Status: 21 November 2017



Without doubt - of German origin and by no means of an amateur like concept

Please notice:- the Philips like IF transformer type, the empty hole must have carried an equal device.

I suppose, often used in the later 1940s and beyond, but when this type really have been introduced is out of my scope.

On the right-hand side a typical Telefunken type coil arrangement (but empty).  



The most left-hand side socket being earmarked "Kriegsmarine"

The way the IF transformer being mounted might have been given by the overall height of this module.


My first thought, it might concern an upgrade of a KM radar module.


In 1944 the German Navy started with upgrading Seetakt radars by interchanging the HF front-end, and implementing instead Berlin like SHF gear (≈ 3200 MHz).

For economical reasons, the regular rig was kept, as far as possible, intact. But some needed essential change, as, for example, the IF stages, where broader bandwidth and according amplification was required.

In my, preliminary, perception, considering their overstressed resources and production capabilities, rather crude concepts might have been adopted.



These connectors (sections) equal the ones used in the E52 Köln receiver and Stuttgart Fu 03 telephony relay-stations; albeit stagged

But also the Russians have adopted them; as these were frequently found on flee markets in the 1990s.


Underneath we encounter typical German components

But not a neat type of wiring, which made German electronics attractive, as the Germans expressed it:- Augenweide.



Viewing it from a different perspective 



Maybe this view is increasing your understanding



Looking in detail at the typical Philips like IF filter connections

I must admit - I never have seen these types within German wartime apparatus.


The second obtained module.


It is quite obvious that some similarity is exists, but quite some differences as well



But scrolling backwards proves - that the connections are being numbered complementary

Also the wire-numbers indicate two different modules, likely once belonging to a complementary system.



The two coaxial connectors are of the well-known naval type, utilised for most of their genuine naval (KM) receivers



One of such typical antenna connector being inserted



In my perception in both modules there exist signs of post war intervention


Let us reconsider one of the foregoing pictures, the blue/green resistor in front looks from post war production; but one never knows it for certain

It is quite clear, that post war components being added; whether as replacement I cannot answer. The yellow wires were widely utilised in German wartime apparatus; mainly applied where higher temperatures were to be expected. 


My preliminary conclusion


I therefore draw the conclusion: in wartime days the military services were the most likely applicants. Considering the colours involved I tend to believe, that - the KM must have been the user for this kind techniques.

I suppose what we should, at least, consider is the necessity for switching over to cm-radar techniques. Like was the conversion of Seetakt into Renner type radar. Where the general equipment was kept intact, and the HF front-ends changed for SHF modules; based upon Berlin FuG 224 techniques. But these modules were too bulky for the quite cramp Seetakt cabin.

On the other hand - all this it might be an incorrect assessment. 


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