Repairing LwEa (wreck)
by LA7MI Stein
Torp, Bergen
reference pages:
n72
Feld.Fu.Bertha
n73
Feldfunksprecher b1 und c
n74
Vollständiges Schaltbild des Lw. Empfängers a (LwEa)
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Receiver
front and inside view
Translation:
Repairing the 60.9kHz IF coils: It was impossible to
open the cans because of rusty screws and other. The screen house
must be carefully cut with hacksaw and coils removed. The inner
bakerlite holder removed. Count the turns. Wind new coil with
10x0.05mm litz wire. When the screen box is opened as described
the screening wount work, therefore it was made a new cylinder of
soldered copperfoil. Note that the coils have rather high Q-value
and replacement seem not right to try. If inductance meter is
available it might be an idea to measure the inductance, even
before the coil is opened, it might turn out that the coil is
right and the prosedure is not needed.
The BFO and detector coils were rewound with 0.13mm enamelled cu
wire (suppose they are not so critical).
Lw.E.a. One of the IF filters. It is two similar IF-stages on
60,9kHz. The circuit is drawn such that the
similarities/differences with Kw.E.a can be seen
LA7MI Stein Torp,
Amatör Radio, Oktober 1985
I enjoy collecting these items and
I will show them on my website for others to
enjoy. I am not interested in selling them, however - please do
not ask.
Instead, I hope to help others who collect this type of gear and
would like to
hear from them.
2004.06.22