CMA 100 Countermeasures Audio Amplifier

CMA-100 Countermeasures Amplifier 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, and alarm wire. The CMA-100 Countermeasures Amplifier functions employ a sophisticated automatic gain control circuit that is superior to most audio amplifiers.

Efficiency: large signals can be monitored with minimal distortions and adjustable bias voltage can activate devices that are voltage or current sensitive

Usability: balanced input impedance can withstand being attached to live power lines with voltages up to 250V

Portability: contains a built-in AC/DC digital voltmeter, select-able audio filters, and a wide dynamic range


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Features & Benefits

  • 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
  • Unique AGC that has 105 dB of control
  • Signals as large as 31V peak-peak can still be monitored with minimal distortions
  • Manual gain control can be set to 0, 25, 50, 75, or 100 dB
  • Filters can be positioned to FLAT, LOW PASS, HIGH PASS, or BAND PASS.

Specifications

INPUT IMPEDANCE

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

BIAS CONTROL

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

MAXIMUM INPUT VOLTAGE

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

AUTOMATIC GAIN CONTROL

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

DIGITAL VOLTMETER

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

FREQUENCY RESPONSE

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

AUDIO

Headphone audio output
Line-out audio output: 600

POWER

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

MECHANICAL

Unit dimensions: 7.3"(184.4 mm) x 2.75"(69.8 mm) x 1.75"(44.5 mm)
Unit weight: 12.1 oz (343 g)

Accessories

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