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RX GRU R-397 OK → ← IRTYSH
Automatic spy radio receiver
- this page is a stub
- wanted item
R-397-LK (Russian: Р-397 ЛК), codenamed LYAPIS (ЛЯПИС), 1 is an
automatic spy radio receiver,
used by the Russian military intelligence
service GRU and by the special forces — Spetsnaz — in particular in counter
intelligence and behind-enemy-lines operations. It can receive low-speed
emergency messages at 19.53 baud from the Centre whilst in stand-by mode 1
at distances up to 4000 km. It is also known as a pager
and was commonly used in combination with the
R-397-OK (OKOLSH) transmitter.
Both devices are used at the field-end of an IRTISH (ИРТЫШ) radio link.
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LYAPIS (ЛЯПИС) is a Russian word which means caustic silver,
also known as lunar silver or silver nitrate.
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Below is an artist impression of the control panel of the R-397-LK with
English labels. It was also available with Russian labels. At the bottom
left are the frequency setting knobs, of which the current setting could
be read from a small window at the side of the device. At the top right are
two control lamps: a green one to check the condition of the battery, and
a red one to show that a message is waiting. The device could hold up to
6 emergency messages in its internal memory.
Move the mouse over the drawing to see the Russian text
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- AM
In this mode, the receiver is suitable for the reception of regular
analogue tone telegraphy that is transmitted in Amplitude Modulation
(A1, AM).
- FM
In this mode, the receiver is suitable for the reception of regular
analogue tone telegraphy that is transmitted in Frequency Modulation
(F1, FM).
- CALL CONTINUOUS
In this mode, the device can receive emergency calls that are transmitted
by the Centre at 19.53 baud. In this mode, the reception of a command or
emergency call takes less than 34 seconds. As soon as the message is complete,
it will be signalled by a lamp.
- CALL CYCLE
This mode is similar to the one above, but is intermittent, which means that
the receiver is switched on for 29 seconds every 240 seconds in order to save
power. In this mode, the reception of a command or emergency call takes
no more than 280 seconds.
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IRTYSH communication system
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The R-397-LK was part of the IRTYSH radio system,
which is shown in the diagram below. The receiver was part of a
radio link between the base station — the Centre – and the agent
in the field — the Correspondent.
The R-397-LK (LYAPIS) receiver is shown in blue at the bottom left.
Most components of the IRTYSH radio system have a model number
that starts with R-397, followed by a two-letter suffix that determines the
actual device. The first letter of the suffix indicates the name of the device
(e.g. 'O' = OKOLSH), whilst the
second letter tells us at which end of the radio link the equipment was used —
field (agent) or base station (centre).
➤ More about IRTYSH
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Device Digital spy radio receiver Purpose Low-power high-confidence agent communication Model R-397-LK (Р-397-РК) Codename LYAPIS (ЛЯПИС) Country Soviet Union (USSR) Year 1975 Users GRU, Spetsnaz Principle Digital Frequency 2 - 20 MHz Steps 10 kHz Sensitivity ≤ 2µV Storage 6 commands Modulation AM, FM, FSK Indicator Optical (light), acoustic (sound) FSK 125 Hz Range 4000 km (with 1 kW base station) Power 12V Current 160 mA max. (4 mA when off) 1 Battery 10НКГЦ-10 Dimensions 260 x 130 x 55 mm (with battery) Weight 1.95 kg (with battery) Temperature -10°C to +45°C
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This is the consumption when in the off-cycle of the CALL CYCLE mode.
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Data retrieved via WayBack machine.
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© Crypto Museum. Created: Sunday 14 February 2021. Last changed: Wednesday, 23 July 2025 - 14:10 CET.
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