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ELBRUS test device
- not in collection
KU-27M
(Russian: КУ-27М)
is a measurement, test and service device for the electronic building blocks
(modules) of the
T-217M (ELBRUS)
voice scrambler,
developed during the Cold War
— in the early 1970s — in the former
Soviet Union (USSR), and used in the
Warsaw Pact countries.
It allows the modules to be tested and aligned, by using test procedures
defined on program cards.
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The installation consists of two main devices: (1) an
interface unit and
(2) the actual test device, each of which is housed in a large heavy grey
hamerite enclosure.
In practice, the test device was placed on top of the interface unit, as shown
in the image on the right. They were probably interconnected by means of
one or more cables.
In addition, there were two grey storage cases with spare parts,
tools and documentation, that were needed for the repair of the equipment
under test. The test device (shown in the image on top of the interface
unit) has a drawer at the front,
inside which a metal container is stowed.
Inside the container are a series of
small brown pertinax circuit boards,
with wiring on one side and a series
of contact points at the other side.
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Each of the cards is wired for a specific test and can be seen as a
program card. By installing it in one of the recptacles, and closing
the hinged lid, the device
is set up for a specific alignment or test procedure,
in a similar way as punched
paper cards were once used with valve (tube) testers.
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The image on the right shows how a program card is installed in one
of the two receptacles at the front panel of the interface unit. The wiring of
the card should be facing outwards.
There are two guide pins to keep the card in place and to ensure that it is
installed the right way around.
The contacts at the reverse side of the program card mate with the contact
bed of the receptacle, allowing the interface unit to 'sense' the wiring of
the program card. Below each receptacle is a
hinged metal frame in which one
of the building blocks (modules) under test should be installed.
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Each frame is held in place by a
metal clip to its right. Pushing the clip
to the right, releases the frame
and allows a module to be installed in the
socket at the bottom. Once this is done, the frame should be closed again
and the test can commence. Each test and alignment procedure is fully described
in the comprehensive manuals, which are stowed in one of the
spare parts boxes.
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Two grey hamerite metal containers with accessories, tools,
spare parts and documentation were supplied as part of the TU-27M
installation. The first box contains a dark grey metal box – similar
to the one stowed inside the drawer of the test device – with additional
pertinax program cards.
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Below the box with additional program cards,
is a removable panel below which several
cartons with spare parts are stowed, each nicely wrapped in brown paper.
The image on the right shows an example of spare parts
(in this case three types of diodes) as found
in one of the boxes.
On the lid of each box is a written checklist of the items that are packed
inside it. The second container holds two more carton boxes with spare parts,
plus a multi-meter in a grey metal container, and a canvas wrapper with
repair tools like screwdrivers and a soldering iron.
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This container also holds the documentation (6 books) and the cables that are
needed to connect the test unit and the interface unit together. During the
Cold War, the installation shown here would have been parts of a (field)
repair workshop. Many thanks to German collector
Immo Hahn for providing access to a complete
installation and allowing us to investigate and describe it [1].
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KU-27 1972 Test device for T-217 (ELBRUS) KU-27M 1976 Test device for T-217M (ELBRUS).
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ZIP (Russian: ЗИП) =
Запасные части И Принадлежности
(spare parts and accessories).
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© Crypto Museum. Created: Tuesday 24 September 2019. Last changed: Thursday, 03 October 2019 - 07:21 CET.
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