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← Wehrmacht Wire tapping Eavesdropping LE-40 →
The device is housed in a common panzerholz transport case, and
consists of a sensitive three-stage amplifier, built around
three RV2 P800 valves (tubes) that are accessible from the front panel
for easier maintenance. The amplifier occupies the upper 2/3 of the case,
whilst the lower part is taken by the batteries, the spare parts, the
cables and the accessories, such as the headphones and the
LZ-35 current probe.
Up to 10 analogue telephone lines can be connected simultaneously to
the terminals at the left side, one of which is selected for monitoring
by means of the switches along the top edge of the front panel.
Knobs are available for adjusting the line impedance and the audio volume.
The image on the right was taken from the manual [A].
Around 1940, the device was succeeded by the improved
Lauschempfänger LE-40,
which had a built-in interference filter.
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This page currently acts as a placeholder for information about the LE-35.
Except for the documentation listed below, no further information about
this intercept amplifier is available at present. You can help us to expand
this page by providing new or additional information.
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Current probe
Lauschzange LZ-35
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Lauschzange LZ-35 was a current probe that was mounted around
a single wire of the analogue telephone line that had to be monitored,
without galvanically touching it. This made the device virtually
undetectable, as it did not affect the line in any way by causing a
load or a disbalance.
The image on the right was taken from the
LZ-35 manual
[B], and shows
the device intercepting an outdoor telephone line.
The device was not small. It measured 120 × 70 × 60 mm
and weighted 590 grams. At the bottom of the cylindrical
enclosure are two screw terminals
for connection to the Lauschempfänger, plus a strain relief
ring for the amplifier wires.
Inside the device is a current transformer with a O-shaped core.
Part of the core is hinged, to allow it to surround the wire that carries
the audio. The transformer picks up the alternating magnetic
field that surrounds the wire during a conversation, and feeds it to
the amplifier.
The LZ-35 was originally supplied with the intercept amplifier LE-35,
but also with the later LE-40.
It was also used with the small and portable
Drahtlauschempfänger D.L.E. (kl).
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-
Document kindly supplied by Günter Hütter [1].
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- Günter Hütter, Information about D.L.E. (kl)
Retrieved July 2017.
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© Crypto Museum. Created: Wednesday 02 August 2017. Last changed: Friday, 01 September 2017 - 17:09 CET.
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![LZ-35 current probe. Image taken from the manual [B].](img/lz35_large.jpg)