High Gain 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
- 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.
Applications
- Technical Surveillance Countermeasures (TSCM)
- Counter Surveillance
- Audio Amplification
- Wiring Testing
- Eavesdropping Detection
- Intelligence Protection
- Executive Protection
- Surveillance Equipment Detection
- Electronic Surveillance Detection
Specifications
INPUT IMPEDANCE |
| 50k Ω balanced Common mode rejection: >75dB Maximum usable input: 31 Vp-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 Ω |
AUTOMATIC GAIN CONTROL |
| 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 |
DIGITAL VOLTMETER |
| 3.5 Digit, auto zero, auto polarity, +/-199.9V AC/DC |
FREQUENCY RESPONSE |
| No filtering: 25 Hz - 44Khz High pass filter: 320Hz - 44kHz Low pass filter: 25Hz - 3.2kHz Band pass filter: 320Hz - 3.2kHz |
AUDIO |
| Headphone audio output Line-out audio output: 600 Ω |
POWER |
| Power on/low battery LED (LED off @ 6.0V) Battery: 9V Alkaline (5 - 30 hours typical run time) |
MECHANICAL |
| 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) |
Downloads
| CMA-100 Owner’s Manual (456 kB) | |
| CMA-100 Brochure (1.6 MB) |
