The Countermeasures 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.
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 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.
| Audio output | Headphone |
| Band Pass Filter | 320Hz to 3.2kHz |
| Battery | 9V alkaline ( 5 - 30 Hrs typical run time ) |
| Bias Control | ( over current protected, input impedance is reduced to 3.6k ohms when bias is active ) |
| Common Mode Rejection | >75dB |
| Digital Voltmeter | 3.5 Digit, auto zero, auto polarity, +/-199.9V AC/DC |
| Frequency response | 25 Hz to 44Khz |
| Headphone Gain Control | 0 to 15 dB |
| High Pass Filter | 320Hz to 44kHz |
| Input Impedance | 50k Balanced |
| Leakage Resistance to Case | >10M |
| LED | Power On/Low Battery ( LED off @ 6.0V ) |
| Line-Out Audio Output | 600 |
| Low Pass Filter | 25Hz to 3.2kHz |
| Manual Gain Control | 0, 25, 50, 75, 100 dB |
| Maximum Input voltage | 250V AC/DC |
| Maximum System Gain | 115 dB manual mode, 120 dB in Auto Mode |
| Maximum Usable Input | 31V p-p |
| Preamp Auto attenuator | ( with overload warning LED ) |
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