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Intercept receivers

During the Cold War, the USSR (Russia) developed a series of miniature portable intercept receivers that were designed to be worn inconspicuously on the chest of the operator. They were used to intercept (clandestine) communication, locate foreign agents (radio direction finding, RDF) and for surveillance. Most of these receivers were designed to be used in close proximity of the transmitter.

In addition to the portable receivers, they developed a series of high-performance stationary communication receivers and radio direction finders (RDF or DF). The receivers below are covered on this website.

Soviet intercept receivers
Soyka body-wearable intercept receiver Filin (A, B and V) body-wearable intercept receiver Sinitsa body-wearable intercept receiver Russian bug detector for the 100 MHz to 12 GHz range
Soyka was a compact versatile body-wearable intercept receiver for the HF-bands between 700 kHz and 30 MHz, divided over 10 ranges. For each range it has a plug-in coil unit. Furthermore, two wide-band (non-selective) plug-ins were supplied.

Soyka was deployed in Russia and some other Warsaw Pact countries, and came in a compact suitcase, together with many accessories.

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Soyka intercept receiver. Click for more information.

Around 1970, the Russians developed a series of miniature portable intercept receivers that were capable of intercepting VHF/UHF AM/FM radio signals in close proximity of the transmitter. There were three models that together cover a frequency range from 24 to 308 MHz.

Filin was used extensively by the Secret Police (Stasi) of the former DDR (East-Germany), who also made some modifications to the unit.

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Filin intercept receiver. Click for more information.

Sinitsa was by far the most advanced portable intercept radio made by the Russians. It covers all frequencies between 30 MHz and 1 GHz, divided over 13 ranges and is even capable of intercepting surveillance radios with frequency hopping (FH).

The aperiodic receiver comes in a suitcase with a large number of plug-ins and accessories. It can even be used for unmanned monitoring by linking it to a telephone line.

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Sinitsa direction finder. Click for more information.

Osobnjak was a range of high-end counter­measures receivers, developed by the Soviets for protection against resonant cavity microphones, a special kind of passive covert listening devices (bugs) that were activated by a strong RF signal.

As the Soviets were the first to employ resonant cavity microphones, they knew that sooner or later their Western counterparts would use the same technology against them.

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