Digital Burst Encoder (USSR)
The DKM-S is a digital burst encoder
that was developed and build in the USSR (Russia) around 1993,
approx. four years after the fall of the Berlin Wall (1989)
and two years after the collapse of the Soviet Union (1991).
It was intended for use in combination with the
Severok-K spy radio set,
but could also be used stand-alone and with other espionage
and Special Forces (SF) radios.
The image on the right shows a typical DKM-S burst encoder
as it was supplied with the Severok-K
radio station. It is a small fully self-contained device that
measures just 7.5 x 3.5 x 13.5 cm and is housed in a lightweight
grey hammerite aluminium case.
Input is via a 16-button keypad at the front panel and output
via the 5-digit 7-segment LED display
just above it.
The DKM-S is connected to the transmitter via a 10-way cable that
is connected to one of the sockets at the top.
The other socket is for connection of a microphone (when available).
Both sockets are wired in parallel, so that the DKM-S can be inserted
in an existing microphone line. The pinout of the two sockets is identical
to the wiring of the microphone socket of the Severok-K radio, allowing
a 1-to-1 cable to be used in this case. The text on the body of the
DKM-S is not in Russian but in English. This was done for two reasons:
(1) to pretend it was a British or US device in case of a capture in
a western country and
(2) to allow it to be used in and by non-Russian speaking countries
(e.g. the former Warsaw-Pact countries, Europe and Cuba).
The DKM-S is powered by a single 9V block battery
that is located behind a small lid at the back of the unit.
The lid can be shifted aside,
giving access to a rather primitive 9V battery holder. The battery is
also used for retaining any messages stored in the device's memory
when switched off.
Operation of the DKM-S is pretty straightforward and is similar to operating
the built-in burst encoder of the
R-394KM radio station.
The column of black keys at the left is used to select the current MODE of
operation. The first key (STO) is used for storing the messages, which are
entered in groups of 5 (numerical) digits each. Once stored, a message can
be recalled by pressing (RCL). It can then be transmitted by pressing (START).
This takes the transmitter 'on air' and sends the message
as a short burst, after which the transmitter is turned off again.
In case of an emergency, it is also possible to send messages directly
without storing them in memory first and without any knowledge of the
morse code alphabet.
After pressing the (MAN) button, andy of the yellow keys
can be used to send the corresponding number in
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