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
Conception likely wartime
Looks like an IF amplifier strip; whether all valves fit into its application? When it should have been part of an radar IF amplifier strip, its bandwidth must have been increased. Therefore they used high slope valve types, like EF 14, and not EF 12s, fitting for LF applications
Has been touched in post war times
The first time I encounter these typical Philips IF transformer types; which even might have been fit with ferroxcube cores
Its appearance is typically a "crash development"
In the first shown module we encounter an RV12P200 valve socket marked: Kriegsmarine. Whether it has been attached in later days, who knows?
Conclusion: there are too many professional techniques involved for a purely amateur like product. Thus it must have had a professional application.
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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