REI CMA-100 User Manual

CMA-100

Counter Measures Amplifier

Owner’s Guide

Research Electronics International

455 Security Place

Algood, TN 38506

931-537-3359

www.reiusa.net

INTRODUCTION: REI

Thank you for purchasing the CMA-100 Countermeasures Amplifier. When doing a
Counter-surveillance investigation, it is important to analyze all of the wiring in the
environment to ensure that building wiring is not being utilized to transport audio or
video information. This wiring may include but is not limited to AC power lines,
telephone wiring, LAN wiring, security system or access control wiring, intercom
speaker wiring, heating and cooling wiring, etc… The main reason for analyzing suspect
wiring is that a microphone that is well shielded is very difficult to detect with an
ORION. Also, an OSCOR will not detect a hard-wired microphone because there is no
radiated signal. The CMA-100 is an ideal tool to analyze miscellaneous wiring for audio
content. Some scenarios of problems that can be discovered with a CMA are:

1. Utilizing an unused pair of telephone wires or LAN wiring to connect directly to a
shielded microphone in the suspect environment

2. A phone set with a hot microphone or hot earpiece used as a microphone.

3. Microphones can easily be installed in miscellaneous wiring such as thermostats,
motion detectors, Intercom speakers, AC Junction boxes, etc…

4. Many digital phone systems have audio leakage that occurs on the digital lines
due to cross talk within the phone set. A CMA can be used to expose this type of
vulnerability.

The CMA-100 can be connected to wiring (assuming that the AC voltage does not exceed
40 VAC or 250 VDC) and the audio content can be accessed. Furthermore, if there is
video content on the wiring, the video synchronization pulses can be heard and identified
through the CMA.

The CMA-100 is a high gain audio amplifier that is used to detect and identify certain
types of surveillance devices connected to building wiring including telephone wiring,

LAN, Server systems, de-energized AC power, etc....

This multi-functional amplifier has a built in AC/DC digital voltmeter, selectable audio
filters, and an extremely wide dynamic range.

Balanced and unbalanced high impedance input provides connectivity to a wide variety
of suspect wiring.

The CMA-100 also provides a bias voltage adjustable between –14.5V to +14.5V DC
that is used to possible activate devices that are voltage or current sensitive.

All of these functions employ a sophisticated automatic gain control circuitry that is
unmatched by any other audio amplifier.

This instruction manual covers the operation and specifications of the CMA-100.

PRECAUTIONS: REI

1. Although the maximum input voltage rating indicates that connection to power

lines would not be detrimental to the equipment or user, it is NOT recommend
maintaining connection to such circuits. Extreme care should be taken when
connecting the CMA-100 to an unknown electrical source. Always check line
voltage with a multimeter first to determine the risk.

2. Although the maximum input voltage is 250 volts, the meter will only be able

to read 199.9 volts.