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This page shows some equipment that was used during or after WWII to
find clandestine radio stations.
Click any of the images for a full description of each device.
Please note that the list is my no means complete. If you have any
further information to offer, or better even: if you have surplus
equipment available for the Crypto Museum, please contact us.
Also note that the title 'Direction Finders' doesn't always work,
but we just couldn't find a better name for it. This chapter also includes
equipment to track down clandestine radio stations, intercept spy
communication (spy sets and
surveillance radios) and find bugs.
A common name for the latter is TSCM (Technical Surveillance and
Counter Messures).
Receivers described on this website:
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This small body-wearable receiver was built by the Russians during the
cold war. It was used to track down the clandestine (spy) stations of their
enemies and to intercept communication between foreign agents.
It is curve-shaped so that it can be worn on the chest, concealed under
the clothing. At least three versions are known to exist, each with their own frequency range.
 More information
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This is a beautiful Russian body-wearable intercept receiver
that was used during the cold war to track down the enemy's
clandestine radio stations and to intercept communication between
agents. The receiver comes in an inconspcious suitcase with 13
plug-in units and several accessories to cover the entire frequency
range from 1 MHz to 1 GHZ.
More information
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This is a Russian wide-range body-wearable intercept receiver
that was used to track down clandestine radio stations and to
intercept communication between agents. The complete set is
packed into a small suitcase and comes with a range of plug-in
coils to cover a wide frequency range. Two special coils are
available to convert the unit into a non-selective receiver,
allowing an entire frequency band to be monitored at once.
More information
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Wilhelm Quante StSG 52
(Germany)
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This German-built portable direction finding receiver was used
in the Netherlands in the early 60s to track down clandestine
radio stations and foreign secret agents. The receiver is housed
in a wooden case, so that the internal window-antenna can be
used. It is operated by a trigger-switch hidden under the carrying
handle.
More information
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This is a rare short-wave direction finder built in Chechoslowakia.
It comes with four plug-in modules that can be inserted at the bottom
of the unit. Each plug-in unit covers a specific frequency range.
More information
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Mason was a manufacturer of TSCM equipment in the USA.
Between the early 1960s and the early 1990s, Mason
developed a wide range of bug-finding receivers, the
so-called Mini Probe Receivers, such as the MPR-1
shown here.
Mason equipment was widely used by government organisations
world-wide and the latest models are still in use today.
More information
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Scanlock is a series of TSCM receivers developed
by Audiotel in the UK. Audiotel have been developing and
manufacturing bug-finders since the early 1970s
and they are still in business today.
More information
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