Granite Island Group

CMA-100 Countermeasures Amplifier

Countermeasures Amplifier (CMA-100)

The Counter Measures Audio Amplifier (CMA-100) is a high gain audio amplifier used to detect and identify certain types of surveillance devices attached to building wiring such as telephone wiring, LAN and server systems, AC Power, Alarm wire etc.

The CMA-100 is designed to provide flexible features and will prove to be very useful in many situations. This amplifier is quite useful for checking telephone lines and other wiring for hostile microphones, testing for hook switch audio leakage, and detection of eavesdropping devices that are sensitive to bias voltages or currents.

Features

The CMA-100 has a balanced input impedance of 50K ohm, can withstand being attached to live power lines with voltages up to 250V, and provides up to 115dB of gain.

Additionally, the CMA-100 utilizes a unique AGC that can automatically adjust gain from -20 to 120dB.

Signals as large as 10V peak-peak can still be monitored with minimal distortions. Manual gain control can be set to 0, 25, 50, 75, or 100dB. Filters can be positioned to FLAT, LOW PASS, HIGH PASS, or BAND PASS.

CMA-100 Advantages

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

Balanced and Unbalanced high impedance inputs provide connectivity to a variety of suspect wiring.

The CMA100 also provides a bias voltage adjustable between -15V and +15V DC that is used to activate possible devices that are voltage or current sensitive. The bias generator is compatible with most types of line conditions.

All of these functions employ a sophisticated automatic gain control circuit that is superior to most audio amplifiers.

Specifications

• Input Impedance: 50k balanced
• Common Mode Rejection: >75 dB
• Maximum Usable Input: 10V p-p
• Preamp Auto attenuator: 0 to -20 dB ( with overload warning LED )
• Automatic Gain Control: -20 to +120 dB ( includes preamp auto attenuator )
• Manual Gain Control: 0, 25, 50, 75, 100 dB
• Headphone Gain Control: 0 to 15 dB
• Maximum System Gain: 115 dB manual mode, 120 dB in Auto Mode
• Frequency Response: 100 Hz to 15 kHz
• High Pass Filter: 300 Hz to 20 kHz
• Low Pass Filter: 100 Hz to 3 kHz
• Band Pass Filter: 300 Hz to 3 kHz
• Headphone Audio Output
• Line-Out Audio Output: 600
• Bias Control: 0 to +/-15V DC, 5mA max
  (over current protected, input impedance is reduced to 3k ohms when bias is active)
• Digital Voltmeter: 3.5 Digit, auto zero, auto polarity, +/-199.9V AC/DC
• Power On/Low Battery LED ( LED off @ 6.0V )
• Maximum Input voltage: 250V AC/DC
• Leakage Resistance to Case: >10M
• Size: 7.3"(184.4mm) x 2.75"(69.8mm) x 1.75"(44.5mm)
• Weight: 12.1 oz (343g)

some specifications subject to change

Warning:

If you are considering buying equipment listed on this page you would do well to ensure that you are dealing with a legitimate factory trained and certified organization like Granite Island Group.

We are factory trained and certified on the equipment and are authorized manufacturers representatives. Our clients have been very pleased with our talent to supply equipment in a very timely manner, and with our honest and straight forward handling of their goods. Normally, we ship orders within 2-3 business days after the order is received (we often ship on the same day), and since we usually ship by express courier any delays are minimal.

BEWARE: There are a huge number of crooked unreliable spyshops that will gladly take your money, but you will not get any equipment in return, or if you do get something it will not be what you ordered. These shady operators are not factory trained, have often never actually owned TSCM equipment or performed a bug sweep, and know virtually nothing about either the equipment being sold or TSCM. There has also been a rash of spyshops advertising this type of equipment at discounted prices (often online or via E-Bay), in almost every case the equipment is stolen, used, damaged, or the customer gets cheated out of their money. In some cases the equipment is used, damaged, or even a stolen unit. Many of these spyshops rip off graphics and/or materials from this website, and some are so bold as to claim copyright on these stolen materials. A few of them have even stolen materials from this site and then published them in book or CD form when you buy equipment from their spyshop. If they are ripping off materials from this site then they are likely going to rip you off as well.

We are honest, have an excellent reputation, and offer legitimate equipment, at fair prices, with favorable availability and shipping. We can, they can't.

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Telephone: (978) 546-3803 / Fax: (978) 546-9467
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