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The device is only marginally different from its predecessor
DÁVAČ,
but has a different layout of the number-keys.
Furthermore, it has a different socket for connection to
the transmitter. The endless tape is in a triangular compartment
on top of the device (at the far left), whereas it was located at the
left side on the DÁVAČ recorder.
In addition, the keys are somewhat recessed so that they can not
be pressed accidently. The numerical keys (0-9) are used for entering a
pre-coded numerical message. The X and Y keys are used for START and STOP
respectively.
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The device can play back pre-recorded messages consisting of 200 groups 2
in just 15 seconds.
Two smaller buttons, just above the keypad (barely visible here) are for
the Record and Erase functions. The mechanical tape recorder at the left
can further be controlled by means of two rotary knobs along the front
edge. The one on the left is for rewinding the tape.
Unfortunately, the case is missing from the device shown here.
Please contact us if you have any further info.
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Správa 6 refers to Government Department 6: Communication Technology.
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In this context, a group consists of 5 numerical digits (0-9).
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The diagram below shows the location of the controls and the connector.
Please note that the device is normally enclosed by a grey hammerite metal
case, sith only the knobs and buttons accessible from the top. For normal
operation, there should be no need to remove the device from its case.
The tape is endless and should only be replaced when it is worn out or broken.
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The diagram below shows the location of the various parts when looking at
the assembly from the bottom. At the centre is the motor that drives the
mechanics. At the right is the coded drum that consists of 10 notched rings,
each of which represents a numerical character in morse code.
Although MĚSIC is mechanically different from its predecessor,
DÁVAČ, the electronic circuit is identical. It can be downloaded
below, along with a full description of the device in Czech/Slovak.
The tape is erased by applying a constant Direct Current (DC) to the
recording head, whilst the tape is running.
Recording is done by applying an intermittend DC to the head.
In playback mode, the signal from the head is amplified,
and then passed on to the transmitter.
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Unfortunately, the MĚSIC device featured above, came without the
original enclosure. The image below shows what the device looks like in
its original case. The photograph was made by Detlev Vreisleben in the
Police Museum in Prague as part of a complete SIRIUS III spy radio set [3].
➤ More about the SIRIUS III spy radio set
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- TI-485
- MESIC
- MĚSIC
- SIRIUS D
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- Anonymous, MESIC burst encoder - THANKS!
Device and documentation kindly donated by anonymous former user. July 2015.
- Louis Meulstee, Wireless for the Warrior, Part 4 Supplement
Forthcoming. Accessed August 2015.
- Detlev Vreisleben, Photographs of SIRIUS III radio set
Germany, 10 February 2005. Received August 2015.
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© Crypto Museum. Created: Sunday 02 August 2015. Last changed: Saturday, 01 July 2017 - 11:48 CET.
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![MESIC burst encoder in the original enclosure. Photograph kindly supplied by Detlev Vreisleben [3].](img/front.jpg)