CMA-100 Countermeasures 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.

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SKU: REI-CMA-100

$1,978.00

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CMA-100 Countermeasures Amplifier

$1,978.00

High Gain Audio Amplifier

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

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)

1 Review

Voltage bias
5
Posted by Jackson Varner on 6th Dec 2021

I love the voltage bias and the gain sensitivity on analog knobs. Gives me me the ability to dial in better than a touch screen.

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Shipping & Returns

Audio devices may not be used to violate the privacy rights of others. In no way will Spy Associates or its subsidiaries or partners be held responsible for inappropriate use of these products.

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Some custom built products may require up to 48 hours, which includes custom audio add-ons that may require 72 hours. You will be notified of any delays as soon as possible.

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Return Policy

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All products which are special ordered by the person ordering and are NOT subject to cancellations. Due to the nature of our product line, returns will only be accepted for products damaged upon shipment to the customer*. All returns must be authorized by SpyAssociates.com before product(s) is returned. SpyAssociates.com will replace, refund, or credit your account for returned product(s) at SpyAssociates.com's discretion. We have been forced to implement this policy because of the attraction of our products to unscrupulous people who return products after they have profitably gained from the short-term use of the products.

*Special exceptions may be made on a case by case basis determined by SpyAssociates.com. In this event, returns are subject to deductions for shipping costs and a 25% restocking charge and must be returned within a ten (10) day period from date of receipt of product(s). NO refunds will be given for products returned without explicit permission from SpyAssociates.com.

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Any return must be authorized by a representative of SpyAssociates.com and under no circumstances will returns be accepted otherwise. Authorization and shipping instructions must be obtained from SpyAssociates.com. No returns will be authorized after ten (10) business days of receipt of product(s) by the customer, unless found to be defective, in which case we will replace at no charge once returned with authorized RMA.

We at SpyAssociates.com strive to offer our customers the best products at the best possible prices. Due to the nature of the products, returns will not be accepted unless the product is found to be defective or unless otherwise explicitly stated on the specific SpyAssociates.com product page.

Shipping & Handling Charges Are Non-refundable.

WARRANTY:

Every product receives FREE LIFETIME SUPPORT. We guarantee all SpyAssociates.com products to be free of defects in workmanship and material for 90 days (some manufacturer's warranty is one (1) year or lifetime - please see info on the page for specific product's details) after sale to the customer. We will replace or repair the product(s) at our option providing there is no evidence of customer misuse, or alteration.

This device will only connect to 2.4 GHz Wi-Fi Networks with passwords that do not contain special characters.

We are unable to guarantee Wi-Fi connection will work with all routers. Although most networks are compatible, certain routers enact stricter security measures that may block remote connections to the camera. Some examples likely to experience these issues are hotels/motels, corporate networks, 4g hotspots, open wifi networks like Starbucks, etc. Some WIFI units require the unit to be paired with a router if the end user is wanting to look at the livestream or receive motion alerts. Only compatible with Android 6 & up, iOS 8 & up. These items will need to format the MicroSD Card before use. This is done through the app.