BELAR AM MODULATION MONITOR, MODEL AMM-2C
The Belar AMM-2C Modulation Monitor is a precision, all solid-state AM demodulator designed to measure the modulation characteristics of AM broadcast transmitters over a frequency range of 260 kHz to 50 MHz. The AMM-2C utilizes a unique carrier-referencing system for the peak flasher indications. Peak flasher accuracy, as well as modulation alarm sensitivity, is independent of carrier level over more than a ±30% range. A built-in calibrator checks the accuracy of modulation readings. Isolated outputs are provided for the built-in modulation and carrier level alarms. Remote outputs are provided for all modulation indications as well as the carrier level.
RF Frequency Range 260 kHz to 50 MHz RF Sensitivity 5 Vrms to 10 Vrms RF Input Impedance 1000 ohms std. (50 ohms opt.) Modulation Meter Range 0 to 133% (switchable to either positive or negative modulation) Fixed indicators -100%, +125% Adjustable peak indicator range: 40% to 130% Modulation Accuracy ± 2% Envelope Pulse Response Overshoot <1% Modulation Level Alarm Adjustable threshold, fixed timeout (-15 seconds) Carrier Level Deviation Meter Range ± 30% Carrier Level (Loss) Alarm Alarms with a 30% drop from nominal carrier level Audio Monitoring Output +10 dBu (2.45 Vrms), 600 ohm, active-balanced Audio Test Output (proof-of-performance) 5 Vrms, rear-panel BNC connector Auxiliary Detector Output 5 Vrms Audio Response +0.0 dB/-0.5 dB, 20 Hz to 15 kHz (detector response -3 dB at 50 kHz) Harmonic Distortion 0.25% maximum at 99% modulation Signal-to-Noise Ratio >80 dB (de-emphasis out) Remote Outputs: Adjustable, +125%, -100% peak modulation indicators; auxiliary detector, carrier reference, remote modulation meter, remote carrier level meter, modulation level alarm & carrier level (loss) alarm Operating Temperature 0°C to +50°C Power Consumption 6 watts, 100-240 V, 50-60 Hz Dimensions 5¼" H ´ 19" W ´ 7" D Shipping Weight 10 pounds (4.5 kg)
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