SHOWCASE 3. CELL 3-31
German Wehrmacht Radios
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E 52a
(Köln) -
Luftwaffe HF communications receiver (Ln 21000).
1.5…25.0 MHz, A1 / A3. Using the same type
of tubes all over - RV 12 P 2000
pentodes. Manufactured by Telefunken from 1943. To
be continued after the picture set...
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E 52
was designed by Telefunken as part of Luftwaffe contract for
four receivers (E 51, E 52,
E 53, E 54) all
similar in appearance, to cover all the usable frequency
spectrum up to 120 MHz. E 51
"Leipzig" was a double-conversion superhet
covering Long and Middle waves. But Wehrmacht already had
enough receivers for frequencies below 1.5 MHz. This is
why only E 52 "Köln" and E 53
"Ulm" were approved for service. E 54
"Kulm" has never seen production because WW II
was over. There
were nearly 10 different models of "Köln" receiver
designed including five models equipped with servo motors (E 52a,
E 52a-1, E 52a-2, E 52c and E 52d). The
servo motors supported mechanical memory to store and
retrieve up to four different frequencies with very high
accuracy. Same servo motors provided for remote control of
two other E 52 receivers for direction finding
purposes. Two
of the "motorized" E 52 receivers are
displayed in our museum. On top of this E 52a (Ln 21000),
one may find E 52a-1 (Ln 21000-4) in our
Showcase
No.8.
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