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Intercept receivers
This section deals with receivers that have been used (or are being used)
to intercept and monitor radio traffic. Please note that there are overlaps
with other sections, as some of these receivers are also used for
radio direction finding, or for finding
the nature and source of an interference.
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Intercept receivers on this website
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Telemetry receivers on this website
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The National HRO was a valve-based (tube) shortwave
general coverage communications receiver,
manufactured by the National Radio Company
(National) in Malden (Massachusetts, USA) from 1935 onwards.
The receiver was intended for military and amateur use and became
very popular for intercept work during WWII.
Different versions of the radio were in production until the 1950s.
➤ More information
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The AR-88 was a valve-based shortwave general coverage communications receiver,
developed and built by the Radio Corporation of America (RCA) in the
early 1940s.
Although the receiver was initially intended as the successor
to the AR-77 amateur receiver, the outbreak of WWII made it evolve into
a professional high-end military-grade intercept receiver
for which cost was not an issue.
➤ More information
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The SX-28 and the later SX-28A were AM/CW communication receivers,
developed and built by Hallicrafters Inc. in Chicago (USA) in 1940,
a few years before the US got involved in WWII.
It is one of the most popular receivers every built by Hallicrafters,
and was used heavily for intercept work during the war.
The receiver is also known as Super Skyrider.
➤ More information
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SSR-201 was an aperiodic or non-selective receiver, developed during
WWII for use by the OSS,
the forerunner of the CIA.
It was used for
finding clandestine radio stations, operated by – mainly German –
spies in the US and in the UK.
After the war, the device was also used by the Radio Monitoring Services
of several European countries.
➤ More information
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This valve-based surveillance receiver was developed by the CIA
in 1958 and covers 50 - 200 MHz. It was used for monitoring and
for the reception of covert listening devices (bugs).
The receiver is based on the military R-744,
which as a similar front panel.
➤ More information
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The SRR-5 was a solid-state VHF surveillance receiver, developed in the
early 1960s. It covers 50 to 400 MHz and is suitable for AM, FM, CW
and modulated CW signals.
➤ More information
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The SRR-8 was a countermeasures receiver, developed by the
CIA between 1961 and 1963. It covers 30-1000 MHz in FM/AM and PM,
and was suitable for stationary as well as mobile use.
➤ More information
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The SR-209 (CIA designator: SRR-23) was a high-end surveillance
receiver, developed in the mid-1960s by ACL in Gaithersburg (Maryland, USA).
It is suitable for frequencies between 2 MHz and 12 GHZ, divided over several
bands, each of which required a separate plug-in tuner.
The receiver is suitable for AM, FM, CW and Pulse, and has three IF
bandwidths, selectable from a wide range of IF-plug-ins.
➤ More information
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Modular receiver for the 260-400 MHz VHF/UHF frequency range, introduced
in 1974 by the NRP for use by the American CIA. Intended for the
reception of pulse-based transmitters (bugs).
Modular construction, designed for transport and operation in a
standard Samsonite briefcase. Succeeded by the
SRR-90.
➤ More information
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Improved successor to the SRR-91, intended for the reception of a
wide variety of transmitters (bugs) with various audio masking
techniques. Developed by the NRP for the American CIA and introduced
in 1975.
The SRR-90A is intended for desktop use and in the vertical version
of the SRR-90B (below).
➤ More information
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Horizontal variant of the SRR-90A receiver shown above.
Highly modular design, developed by the NRP and introduced with
the CIA in 1975. Intended for installation inside a regular
executive style Samsonite briefcase.
Suitable for the reception of a wide variety of transmitters (bugs)
with different audio masking schemes, including pulse-based
transmissions, and subcarrier modulated signals.
➤ More information
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The SRR-100 is a covert intercept receiver, sometimes referred to as a
scanner, that was used by CIA operatives to check whether they were
under Soviet surveillance, by intercepting the KGB's communication channels.
The receiver was body-worn and was usually hidden under the operative's
clothing. It was complemented by a Phonac wireless earpiece.
➤ More information
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The SRR-145 is a so-called down-converter that is used to
make existing UHF intercept receivers, such as the
SRR-52
and SRR-90,
suitable for the reception of bugs that operate in the 1500 MHz band,
such as the SRT-107.
➤ More information
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Special receiver for the 260 to 320 MHz band, suitable for the
reception of transmitters (bugs) with subcarrier (SC) audio masking.
Developed around 1981 as part of the
SRS-153 surveillance system,
that was (partly) a 'chinese copy' of a bug that had been found
in the desk of a US Ambassador.
➤ More information
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Kolibrie (hummingbird) was an intercept receiver
for car phones (cell phones)
developed by the Police Signals Service in The Netherlands
in the early 1990s. It was intended for intercepting
criminal conversations on the analogue ATF-3 (NMT-900) car phone networks.
➤ More information
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In the 1980s and 1990s, Schlumberger GmbH developed a series of
high performance digital programmable precision receivers,
under the name Minilock. The receivers were used by many agencies
for intercepting, measuring and fingerprinting radio signals.
➤ More information
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The EB-100 is a small portable surveillance receiver build in the 1980s by
Rohde & Schwarz in Munich (Germany).
It was intended for a variety of jobs, including frequency monitoring,
radio surveillance, radio intercept, EMC measurements and direction finding.
Due to its small size and wide frequency range, it is extremely useful for
bug tracing. EB-100 is also known as MINIPORT.
➤ More information
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The EB-200 is the successor to the EB-100. It is a portable receiver
that covers all frequencies between 10 kHz and 3 GHz, with a wide
variety of modulation types: AM, FM, CW, LSB, USB, Pulse and I/Q.
It is one of the first receivers that has
a fully digital IF-stage with DSP technology.
The radio was intended for monitoring of the frequency spectrum and
for locating sources of transmission, including
covert listening devices.
➤ More information
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Bodrog was a series of wideband VHF and UHF receivers, developed and built
in Czechoslovakia,
especially for the reception of FM radio bugs.
The version shown here is the A-variant that was used for the VHF-H band.
It was supplied with a mains PSU and a removable battery pack.
➤ More information
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During the days of the Cold War, the secret service of the
former DDR (East Germany), also known as the Stasi, used this receiver
to monitor domestic and foreign radio traffic.
➤ More information
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PAN-1000 was a high-end general coverage panoramic receiver, developed by
the Dutch Radar Laboratory (NRP) for the Dutch Radio Monitoring
Service (RCD) in the early 1980s.
The receiver covers a frequency range from 0.1 to 1000 MHz
and could be fitted inside a car. It was intended for locating
clandestine radio stations (pirates).
➤ More information
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During the Cold War, the USSR (Russia) developed a series of highly portable
intercept receivers that were deployed in most Warsaw Pact countries.
Such receivers where generally carried around the operator's waist, hidden
under his clothing.
They also developed stationary and mobile intercept radios and other
direction finding equipment.
➤ More information
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1100-AR is a telemetry receiver for aerospace applications,
made by Microdyne in the USA.
Although it was produced in the l1960s and 1970s,
many of them were still in use in 2019.
Because of the modular design of the receiver, it was also used
as a surveillance and intercept receiver, by
intelligence agencies
like the CIA.
➤ More information
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© Crypto Museum. Created: Saturday 24 December 2016. Last changed: Tuesday, 17 August 2021 - 06:23 CET.
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