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Krypto-Fernsprecher
KF 4-2, also known as 103K-47-F, was an
analogue voice terminal,
manufactured in the early 1980s by Gelma Industrie-elektronik in Bonn (Germany)
for use by NATO.
It consists of a grey telephone set with a
green handset,
and was probably used as part of an underground
Cold War
NATO communications system. It is als known by its stock number
NSN 5805-12-183-3784.
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The basic device is a grey German analogue 1 FeTAp-612 desktop telephone set,
of which the dial has been replaced by a blank panel. These telephones were
made by a variety of German manufacturers, including
Siemens and Hagenuk.
The device is fitted with a green handset,
that probably indicates that it was
used on a secured (encrypted) line.
Strangely, the device is a hybrid, as the handset is from a
Dutch T-65 telephone,
rather than a FeTAp-61 2 as one would expect.
It has an integrated push-button
near the speaker, and is fitted with a
noise-cancelling microphone.
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Due to the fact that the
noise-cancelling microphone is thicker than a
regular one, the handset is
not fully seated in the cradle when it is
placed on-hook. The device is connected to the local exchange, or
PABX, via a standard 4-wire cable that has a
5-pin male XLR plug fitted
at the end. At the front right is a ground-button that was probably used
for calling the exchange. At the front of the device is a DYMO label with
the number 4, which indicates that this was extension 4.
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FeTAp = Fernsprech Tisch Apparat (Remote Speech Table Device).
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The German FeTAp-61 and the Dutch T-65
are very similar and are nearly
identical in size, which is why the Dutch handset fits the German
telephone set. The reason for using the T-65 handset might be related
to the presence of the push-button, the noise-cancelling microphone
and/or the colour of the handset.
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At present we have no further information about this device, or the
communications system to which is was connected. According to a former
owner, it was found in the underground bunker of a large Dutch facility.
If you have any information about the use of this telephone set, or
about the system to which is was connected, please contact us.
➤ Contact Crypto Museum
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Yellow Fa Speaker (1) Green Fb Speaker (2) White Ma Microphone (1) Brown Mb Microphone (2) Grey ? Button (1) 1 Pink ? Button (2) - ? not connected
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THis is a normally closed switch.
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White La Line (A) Brown Lb Line (B) Green W Extra bell Yellow E Ground
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The device is fitted with a regular 4-wire telephone cable, with a 5-pin
XLR socket at the end that was proably fitted to a wall socket or directly
to a (secure) communications device. Below is the pinout of the XLR
connector, when looking into the female socket in which the plug is seated.
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Green W Yellow E Brown Lb Line (B) White La Line (A) - not connected
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© Crypto Museum. Created: Sunday 01 March 2020. Last changed: Wednesday, 23 June 2021 - 12:35 CET.
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