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← USSR
Voice
R-142
  
T-219 Yachta   ЯХТА
Voice scrambler - this page is a stub

T-219, codenamed Yachta 1 (Russian: ЯХТА), is an analogue voice scrambler, used during the Cold War by the Russian Army and by the armies of the former Soviet Union and the former Warsaw Pact, for sending time-sensitive information. The unit was installed as part of the R-142 radio set, inside the shelter of a GAZ-66 truck, but was only released in the event of a war.

Yachta consists of two units: the actual voice scrambler device, and a remote control panel. It is usually connected to a short-wave (SW) radio station, but can also be used over analogue telephone lines. The image on the right shows the rather big and heavy control panel [1].

The system was coded by means of a key card that was installed in the main unit. An external heater was used to keep the device warm in the winter. Although voice scramblers are inherently unsafe, the T-219 was used by the Russian Army until long after the fall of the Soviet Union [6].
  
Yachta T-219 control panel

Yachta is characterized by a Frequency Shift Keying (FSK) signal that is transmitted in the middle of the main signal, with the scrambled voice stream split above and below the FSK signal. The FSK signal is transmitted at 100 Baud and uses an 150 Hz shift [3]. One of the known frequencies on which Yachta signals were transmitted, is 28.347 MHz. Yachta was succeeded by CIS-12.

  1. Yachta, sometimes written as Yakhta, is Russian for 'Boat'.

Yachta T-219 control panel Side view Signal lamps Switches and selectors Simplex/duplex selector Counter Model and serial number Connectors at the rear
Decoding
Yachta signals can be decoded with the following software:

Specifications
  • Frequency
    3 - 30 MHz
  • Mode
    USB
  • Bandwidth
    2700 Hz
  • Modulation
    FSK
  • Speed
    100 Baud
  • Shift
    150 Hz
References
  1. Immo Hahn, Yachta control panel
    28 April 2013.

  2. SAS Fernsprechgerät T-219, T-219 M, T-817 N
    Retrieved May 2017.

  3. Signal Identification Guide, Yachta T-219 Voice Scrambler
    Retrieved May 2019.

  4. Signal Identification Guide, High Frequency (HF)
    Retrieved May 2019.

  5. Radioscanner.RU, Yachta T-219
    Retrieved May 2017.

  6. Southgate, Russian vocoder Yakhta back on 21 MHz
    9 October 2013.
Further information
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Crypto Museum. Created: Friday 12 May 2017. Last changed: Saturday, 13 May 2017 - 12:56 CET.
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