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Demodulation and RF Intercept Equipment


The entire Watkins-Johnson line of equipment is popular within the TSCM and SIGINT community. The equipment is expensive, ruggedized, and suitable for combat environments. The equipment is designed for use by the defense and intelligence community, with very specific requirements. Watkins-Johnson products are designed to take abuse, and virtually every spy plane, NSA facility, or listening post contains large amount of this equipment.

The bottom line regarding TSCM and WJ is that, every serious TSCM TEAM has at least $50,000 in Watkins-Johnson equipment available to use during TSCM inspections.

Anyone who has received formal government training in TSCM or SIGINT has learned to use the Watkins-Johnson receivers, and will be an expert in their usage.

WJ-8710A Compact Digital VLF/HF Receiver
This unit is a fully synthesized, general purpose HF receiver which does a fantastic job of detecting and demodulating VLF eavesdropping devices. The radio covers 5 kHz to 30 MHz, and is controlled from an external computer. Standard AM, SAM, FM, CW, USB, LSB, and ISB detection modes. The WJ-8710A is a super compact, lightweight version of the larger WJ-8711 and HF-1000. The DSO option allows Digital Scan Output, which offers the IF signal in a digital format.

WJ-8654 Miniature VHF/UHF Microceptor Receiver
The WJ-8654 Microceptor is an extremely small VHF/UHF general purpose receiver with frequency coverage from 20 MHz to 1 GHz. The HFE option extends the lower frequency range to 500 kHz, and the FE option extend the "upper side" all the way to 2.4 GHz. Standard AM, FM, CW, USB, and LSB detection modes. Subcarriers are detected by looping the output of the radio into an HF receiver such as the WJ-8710A (see above). The WJ-8654HFE may be tuned all the way down to 0 Hz (pure DC) with degraded performance. The WJ-9168 Signal Monitor Module is a very popular addition to the WJ-8654, which take two IF inputs of 21.4 MHz and creates a real time panoramic display. The entire system including the WJ-8654, HF extension, Microwave Extension, and Signal Monitor Module weighs less then six pounds, and measures only 4.5 * 3.0 * 7.8 inches. Six complete systems, battery pack, antenna, and laptop will easily fit into a standard briefcase (with room to spare).

WJ-8609A VHF/UHF Wide Bandwidth Receiver
The WJ-8609A is a small, lightweight, VHF/UHF general purpose receiver with frequency coverage from 20 MHz to 512 MHz. The FE option will extend this coverage from 20 Mhz to 2 GHz. The unit contains five bandwidths, ranging from 500 kHz to 40 MHz. The WJ-8609A is an excellent product for detecting video eavesdropping devices. The radio weighs five pounds, and measures 1.5 * 6.5 * 10.5 inches. This radio is controlled from an external laptop computer.

WJ-8609A-01 Wideband Microwave Miniceptor Receiver
The WJ-8609A-01 is used with a WJ-9290 Block downconverter to cover a frequency range from 235 MHz to 18 GHz. This permits the compact Miniceptor receiver to cover microwave frequencies. Very wide bandwidth are available (500 kHz to 40 MHz) to facilitate the detection of modern microwave spread spectrum devices.

WJ-8607A VHF/UHF Fast Miniceptor Receiver
The WJ-8607A Fast Miniceptor is small, frequency agile, lightweight, VHF/UHF general purpose receiver with frequency coverage from 2 MHz to 512 MHz. The FE option will extend this coverage to 2 Mhz to 2 GHz. The receiver can "scan" at a speed of 200uS per 25 Khz (1 MHz span in 8 milliseconds). The DSO option allows Digital Scan Output, which offers the IF signal in a digital format.This radio is controlled from an external laptop computer.

WJ-8607 VHF/UHF Miniceptor Receiver
The WJ-8607 Miniceptor is small, frequency agile, lightweight, VHF/UHF general purpose receiver with frequency coverage from 2 MHz to 512 MHz. The FE option will extend this coverage to 2 Mhz to 2 GHz. This is the older, less expensive version of the Miniceptor. The DSO option allows Digital Scan Output, which offers the IF signal in a digital format. This radio is controlled from an external laptop computer.

WJ-8809A/SYS Microwave Receiver System
The WJ-8809A/SYS is small, frequency agile, lightweight, Microwave Receiver System with frequency coverage from 100 MHz to 18.5 GHz. This is a very wide bandwidth receiver to facilitate the detection of modern microwave spread spectrum video and data eavesdropping devices. This radio is controlled from an external laptop computer.

WJ-31290-1 Miniature Microwave Receiver System
The WJ-31290-1 is miniature, lightweight, microwave receiver system with frequency coverage from 500 MHz to 26.5 GHz. The system is designed to receive high-order and high data rate PCM/QAM signals. IF outputs of 1 GHz, 160 MHz, and 70 MHz allow for a variety of bandwidths ranging from 250 kHz to 500 MHz. This is a very wide bandwidth receiver which will facilitate the detection of modern microwave spread spectrum video and data eavesdropping devices. This radio is designed to be controlled from an external laptop computer, and operated from a compact briefcase.

Condor Systems

CS-6700 ACES - Advanced Carry-On ELINT/ESM System
This system is very popular with TSCM teams. The basic system provides coverage from 500 MHz to 18 GHz, which may be extended up to 40 GHz. The system utilizes a wide instantaneous bandwidth, and has excellent sensitivity. The TN-618 Tuner provides a 1 GHz IF, with a 500 MHz bandwidth which allows for a very high probability of intercept. The system utilized a Sun Microsystems laptop for control, and will "track" up to 1024 suspect emissions. The emitter library may contain 4,000 to 10,000 entries. This system is excellent for detecting spread spectrum, frequency hopping, multi-beam, pulse and CW eavesdropping threats.

CS-2040 - Mini-Hawk Receiving System
The Mini-Hawk Receiving System is based on the HAWK architecture, and may be configured to control two spinning DF antenna systems. The C-244 controller weighs only 40 pounds, and provides a color 640 * 480 pixel display. IF outputs of 1 GHz, 160 MHz, and 21.4 MHz allow for a variety of bandwidths ranging from 100 kHz to 500 MHz. Frequency coverage of the primary system is 500 MHz to 18 GHz. Optional frequency converters will extend this coverage to include 20 MHz to 40 GHz. This system is typically vehicle mounted and used to profile the exterior of the facility prior to performing TSCM inspections.

CS-2221 - Miniature Receiving System
The CS-2221 Miniature Receiving System is a laptop controlled system covering a frequency range of 500 Mhz to 18 GHz. The system measure only 11.5" * 11" * 3.5" and weighs 28 pounds.

WJ-36400 - Spectrum Monitoring System
The WJ-36400 is easily transported and may be installed in either a transit case of rack. A cost effective superhetrodyne microwave receiver with frequency coverage from 80 MHz to 18 GHz. The scan rates, sensitivity, and wide RF/IF bandwidth exceeds that of most spectrum analysers. This system is very popular for in-place monitor of classified areas, SCIF's, and screen rooms.


TRC-620 Series Receivers
The TRC-620 series is one finest families of intercept radios available. Three models offer frequency coverage from 300 kHz to 1.35 GHz which may be extended up to 2.7 GHz. These units utilize a digital IF, and high performance signal processing algorithms. The TRC-2981 and TRC-3941B are excellent additions to any TRC-620 series radio, and provides a panoramic display.

Marconi Defence Systems, Ltd.

Marconi Bragg Cell Receiver
A Bragg Cell receiver splits an extremely high bandwidth signal into a series of parallel frequency channels. The split signal is then detected by a series of photo detector elements. Frequency coverage is available to well over 2 GHz, with frequency resolution down to 100 kHz. Several non-linear junction detectors utilize Bragg Cells to enhance operation. A product such as this is typically used to detect frequency hopping, and spread spectrum signals.


Nanomin Receiver
Miniature multi-channel intercept receiver with a frequency range from 20 MHz to 1.5 GHz. Multiple IF bandwidths, and demodulation of AM, FM, and CW signals permitting the interception of voice, data, telemetry and pulse signals. Primarily used by TSCM teams as a "very fine grain" spectrum analyser which is totally controlled by a laptop.

Andrew SciComm

SCR-7204 Receiver
An excellent VHF/UHF series of radios with frequency coverage from 20 MHz to 2.5 GHz. Compact size, and integral SCD-7304 IF panoramic display.

Racal Communications

RG-5545A VHF/UHF Receiver
VHF/UHF radios with frequency coverage from 20 MHz to 1 GHz. Integral RG-1320A IF panoramic display and four IF bandwidths.

Rohde and Schwarz

EB-100 Miniport Receiver
Portable VHF/UHF radios with frequency coverage from 20 MHz to 1 GHz. Fairly sensitive, but weak above 500 MHz. HE-100 active directional antenna is handheld and provided close range detection of RF activity. Integral EPZ-100 mini IF panoramic display displays 200 kHz of the 10.7 IF. This system is very popular with TSCM teams in Europe and England but not the United States.

Hewlett Packard

HP E6501A VXI Receiver
New HP VXI mini rack based receiver system with frequency coverage from 20 MHz to 1 GHz (DC - 3 GHz optional). Powerful DSP IF processing, and very sensitive analog section. Multiple units may be used to provide a very cost effective DF system for space domain analysis. A VLF/HF mixer is typically used to extend the lower coverage to DC levels. This receiver may be used to monitor the IF output of 21.4 from a spectrum analyser. Signal demodulation is available via powerful DSP algorithms (AM, FM, PM, SS, CW, and others). Digital I and Q outputs are available to permit vector analysis. While a basic system costs $15,000 this is a very valuable system for TSCM usage.

Audiotel International

The Scanlock ECM+ Countermeasures Receiver is a TSCM instrument which covers the frequency range from 12 KHz to over 4 GHz. The spectrum is covered in two ranges; 8 KHz to 10 MHz, and 10 Mhz to 4+ GHz.

The Scanlock 2000 is an older unit with coverage from 10 Mhz to 4 GHz.

Both units are expensive, the ECM+ has a base price of $9500, and the 2000 has a base price of $5520. While both units fill a specific instrumentation requirement the funds would best be spent on a Watkins-Johnson or Rockwell radio.

Both instruments are strictly for use in low threat TSCM services.

Radio Frequency Countermeasures

Carrier Current/Sub Carrier Countermeasures

| Spectrum Analyzers | Vector Signal Analysers | Demodulation | Time Domain Reflectometers |
| Antenna | Oscilloscopes | Multimeters | Craft Instruments | TSCM Specific Instruments |
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Advanced TSCM Signals Detection and Analysis
TSCM - Sweeping the Spectrum for Eavesdropping Devices

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