Order until 14:00 CET and we will ship today! One-day delivery across EU
Research Electronics International
CMA-100 Countermeasures Amplifier
Price on request
Delivery in 30 days
Send inquiry
14 day refund
24 month warranty

The CMA-100 Countermeasures Amplifier, a high-gain audio amplifier, is designed to discover and pinpoint specific kinds of hidden surveillance equipment connected to building infrastructure, such as those connected to telephone lines, local area networks (LAN), server systems, alternating current power, and alarm wiring.

One of the standout features of CMA-100 is its sophisticated automatic gain control circuit. This feature allows it to surpass many other audio amplifiers, providing you with more reliable and accurate results. It's capable of processing large signals while minimizing distortions, ensuring the clarity of your findings. 

The CMA-100 also features an adjustable bias voltage. This allows the CMA-100 to interact with and activate devices that respond to specific voltage or current levels, expanding the range of surveillance devices it can detect.

With its balanced input impedance, it can withstand being attached to live power lines with voltages up to 250V. Also, if there is video content on the wiring, the video synchronization pulses can be heard and identified through the CMA-100.

Despite its powerful capabilities, the CMA-100 is designed with user convenience in mind. It's portable and equipped with a built-in AC/DC digital voltmeter. It also offers selectable audio filters and a wide dynamic range, allowing you to customize its operation to suit your specific needs.
Learn more about complete REI TSCM equipment available at SpyShopEurope.com.

CMA-100 Main Features:

  • Advanced high gain audio amplifier with automatic gain control circuit
  • Identifies and locates surveillance equipment connected to building infrastructure
  • Handles large signals with minimal distortions
  • Adjustable bias voltage can activate devices that are sensitive to specific voltage or current levels
  • Balanced input impedance allows connection to live power lines up to 250V
  • Portable design with built-in AC/DC digital voltmeter
  • Offers selectable audio filters and a wide dynamic range
  • Optional Acoustic Leakage Probe ALA-100 - for evaulating structure bond acoustic leakage

CMA-100 Specifications: 

50k Ω balanced
Common mode rejection: >75dB
Maximum usable input: 31 Vp-p
Preamp auto attenuator: 0 to -40 dB (with overload warning LED)

0 to +/-14.5V DC, 5mA max (over current protected, input impedance is reduced to 3.6k ohms when bias is active)

250V AC/DC
Leakage resistance to case: >10M Ω

Manual gain control: 0, 25, 50, 75, 100 dB
Headphone gain control: 0 - 15 dB
Maximum system gain: 115 dB Manual mode, 120 dB in Auto mode

3.5 Digit, auto zero, auto polarity, +/-199.9V AC/DC

No filtering: 25 Hz - 44Khz
High pass filter: 320Hz - 44kHz
Low pass filter: 25Hz - 3.2kHz
Band pass filter: 320Hz - 3.2kHz

Headphone audio output
Line-out audio output: 600 Ω

Power on/low battery LED (LED off @ 6.0V)
Battery: 9V Alkaline (5 - 30 hours typical run time)

Unit dimensions: 7.3 in x 2.75 in x 1.75 in (185.4 mm x 69.8 mm x 44.5 mm)
Unit weight: 12.1 oz (343 g)

ACOUSTIC LEAKAGE PROBE ALA-100 (Optional) - Evaluates structure bound acoustic leakage (walls, windows, etc.)
Frequency Response:
50Hz - 10kHz 
(surface dependant)
Impedance: 47K Ohm

CMA-100 Countermeasures Amplifier Feature Focus: 

Advanced Automatic Gain Control Circuit

The CMA-100 Countermeasures Amplifier features advanced automatic gain control circuit, a key feature that sets it apart from other audio amplifiers. This circuit automatically adjusts the gain of the amplifier to maintain a consistent output level, even when the input signal strength varies. This feature is crucial in detecting and identifying surveillance devices as it allows the CMA-100 to maintain a high level of accuracy and efficiency, ensuring reliable results even in challenging conditions.

Detection and Identification of Surveillance Devices

The CMA-100 is designed to detect and identify a wide range of surveillance devices that could be hidden within a building's infrastructure. This includes devices connected to telephone lines, LAN and server systems, AC power, alarm wire, and even leftover wiring that is no longer in use. Its comprehensive detection capabilities make it an all-in-one solution for surveillance detection, providing peace of mind that your environment is secure from various potential surveillance threats.

Handles of Large Signals with Minimal Distortions

One of the standout features of the CMA-100 is its ability to handle large signals while minimal distortions. This is particularly important when dealing with strong signals from surveillance devices. Despite the strength of these signals, the CMA-100 ensures that the output remains clear and accurate, providing reliable results.

Adjustable Bias Voltage

The CMA-100 features an adjustable bias voltage, allowing it to interact with and activate devices that respond to specific voltage or current levels. This increases the range of surveillance devices that the CMA-100 can detect and identify, making it a versatile tool in surveillance detection and countermeasures. Whether a device is voltage or current sensitive, the CMA-100 can adjust accordingly to ensure detection.

Balanced Input Impedance

The CMA-100 is designed with balanced input impedance, allowing it to be connected to live power lines with voltages up to 250V. This feature ensures that the device remains durable in various environments and conditions, providing reliable performance even when connected to high-voltage power lines.

Portability and Built-in AC/DC Digital Voltmeter

Despite its advanced features, the CMA-100 is designed with user convenience in mind. It is portable, making it easy to transport and use in various locations. Additionally, it comes with a built-in AC/DC digital voltmeter, providing a convenient way to measure voltage levels without the need for additional equipment.

Selectable Audio Filters and Wide Dynamic Range

The CMA-100 offers selectable audio filters and a wide dynamic range, allowing you to customize its operation to suit your specific needs. Whether you need to filter out certain frequencies or adjust the device to handle a wide range of signal strengths, the CMA-100 provides the flexibility to do that. This ensures more precise and tailored detection results, enhancing the effectiveness of your surveillance detection.


For more detailed specifications, please carefully study the PDFs available for download below.
24 Months Warranty
CMA-100 Countermeasures Amplifier User Manual
>>Download detailed specifications (PDF)<<


Disclaimer: Items on the website are not be used for the purpose of illegal surveillance of unsuspecting subjects. The items are to be used only in compliance with all the local laws and regulations under the threat of penalty.

Spy Shop Europe uses cookies to provide a better user experience. To continue using the website, click on "I agree" to agree with the use of cookies.
For more information about cookies that Spy Shop Europe uses follow this link. I agree