Belar AMMA-2 AM modulation monitor and analyzer front panel

Belar AMMA-2 – Modulation Monitor / Analyzer

$ 4,109.38 $ 4,316.86

The Belar AMMA-2 is a DSP-based AM modulation monitor and analyzer that measures positive and negative peaks, modulation density and noise, with MDCL support, audio sentry alarms and remote serial control for precision AM transmitter monitoring.

AMMA-2
$ 4,109.38 $ 4,316.86
MP-17 Remote Meter Panel
$ 1,492.75
SKU: 101250 Categories: , , Tags: , , , , , , Brand:Belar

Description

Product Overview

The Belar AMMA-2 – Modulation Monitor / Analyzer is a DSP-based AM modulation monitor designed to give precise, repeatable measurements of on-air performance. It displays positive and negative peak modulation, peaks per minute, average modulation and modulation density, helping engineers run loud yet compliant AM signals. Covering roughly 150 kHz to 30 MHz with selectable 50 ohm or 500 ohm RF inputs, the Belar AMMA-2 suits everything from medium-wave stations to HF services.

All measurements are referenced directly to carrier level and the unit supports MDCL operation, tracking carrier high and low values so readings remain accurate in any mode. A built-in Audio Sentry function supervises programme audio and raises alarms for loss or low modulation. The front panel combines large numeric LED readouts with a menu display and status indicators, while non-volatile memory stores set-up data so configuration is retained after power interruptions.

Balanced audio outputs on XLR and BNC provide wide-band AM audio with low distortion and high signal-to-noise ratio for monitoring or further analysis. For integration with modern plant control, the Belar AMMA-2 includes an RS-232/RS-422 serial port with an ASCII command set plus rear-panel relay contacts for remote alarms. Housed in a 1U 19-inch rack chassis with universal AC power, it is a rugged, long-term solution for precision AM transmitter monitoring.

Frequently Asked Questions

  • Q: What parameters does the Belar AMMA-2 measure?
    A: It measures positive and negative peak modulation, peaks per minute, average modulation, modulation density and noise, with special modes for MDCL transmissions.
  • Q: How do I get audio and data from the unit?
    A: Wide-band audio is available on balanced XLR and BNC outputs, while RS-232/RS-422 and alarm relays allow remote monitoring and control from the transmitter room or a remote site.

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Additional information

Weight4.5 kg
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features

MEASUREMENTS: Positive Peak Modulation in Percent Negative Peak Modulation in Percent Positive Peaks-per-Minute Count Negative Peaks-per-Minute Count Positive Peak Average & Peak Min Modulation Negative Peak Average & Peak Min Modulation Positive Average/Peak Modulation Ratio Negative Average/Peak Modulation Ratio Normal Modulation Peaks-per-Minute Count AM Noise rms detected in dB Carrier Level Carrier Reference Carrier High in sliding 1 minute window Carrier Low in sliding 1 minute window Carrier Ratio High/Low in dB   SETTABLE PARAMETERS: Positive & Negative Peak Modulation Indicator Positive & Negative Peaks/Minute Indicator Normal Modulation Indicator Positive & Negative Peaks/Minute Duration Audio Failure Alarm – Time & Modulation Modulation Mode (Normal/Fixed/MDCL/IMOD) MDCL Reference Carrier Shift Alarm Carrier Failure Alarm – Time & Level Display Hold Time Time Mode (Real/Past) Infinite Hold Audio Outputs (Test/Meter) Modulation Calibrator Tuning Frequency Tuning Mode (Dir/Auto/Scan/Lock) Tuning Frequency Increments

specification

Specifications: RF Frequency Range 150 kHz to 30 MHz RF Tuning Increments 1 kHz RF Sensitivity 1 to 10 volts rms RF Input Impedance 500 ohm or 50 ohm, internally connected Accuracy 1.0% Display Large Large 3 digit LED for Negative Modulation, 16-character alphanumeric LED display for menus and parameters Frequency Response ±0.1 dB, 30 Hz to 10.2 kHz -3dB @ 11.9kHz -100 dB @ 16 kHz Audio Outputs Audio Monitor +10 dBm, 600 ohm, balanced (XLR), NRSC or Flat Audio Test 2.5 V rms unbalanced (BNC) Frequency Response ±0.1 dB, 30 Hz to 10.2 kHz Distortion less than or equal to 0.1% @ 99% modulation IMD (SMPTE, CCIF, DIM) less than or equal to 0.1% @ 99% modulation Signal to noise ratio 75 dB Signal Delay Test: 3 ms., Meter: 90 ms. Automatic Carrier Level Adjustment range 25-150% Remote Meter Output Jack for optional MP-17 analog remote meter panel Remote Alarms Relays for Loss of Modulation Normal, Negative PPM, Positive PPM Loss of Carrier, Remote, and General alarms. Relays can be set NO or NC Serial Interface RS-232/RS-422 Unit Interface Wizard Standard Interface Power Requirements 20 watts, 100-240 Vac 50/60 Hz Dimensions 1 3/4"H x 14"D x 19"W (EIA rack mount) Shipping Weight 10 lbs (4.5 kg)

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