BELAR "THE WIZARD", MODEL AMMA-2, DSP-BASED MICROPROCESSOR-CONTROLLED DIGITAL AM MODULATION MONITOR AND ANALYZER
BELAR "THE WIZARD", MODEL AMMA-2, DSP-BASED MICROPROCESSOR-CONTROLLED DIGITAL AM MODULATION MONITOR AND ANALYZER
The Belar AMMA-2 is a DSP-based microprocessor-controlled, digital AM modulation monitor/analyzer that precisely measures positive and negative peak modulation, peaks per minute, average peak modulation, modulation density, and more. In addition to monitoring standard AM modulation, the AMMA-2 accurately monitors modulation-dependent carrier level (MDCL) AM transmissions. During MDCL broadcasts, the RF carrier level becomes a dynamic component of the AM signal. The AMMA-2 tracks the carrier, capturing the highest and lowest values of the carrier level, as well as the decibel ratio of the carrier high/low. Modulation readings are referenced to the carrier level appropriate for the MDCL system in use. The optional remote meter panel displays positive modulation, negative modulation, and carrier level simultaneously on three large analog meters.
The AMMA-2 features user-defined parameters and settings for maximum flexibility. Two large UP/DOWN menu keys are used to cycle the 16-character alphanumeric display to the desired menu; the UP/DOWN parameter keys are then used to select the desired setting. The unit configuration may be saved to the on-board non-volatile memory so the settings are retained in the event of a power loss.
A noise menu selection displays rms-detected SNR in decibels (flat or
de-emphasized) on the front panel.
A carrier cutoff indicator consisting of
three front panel LEDs continuously monitors the approach of negative
modulation to carrier cutoff.
A unique "Normal Modulation" indicator shows when modulation is falling within user-defined parameters.
A built-in Audio Sentry audio failure alarm alerts you to loss of modulation or drops in modulation level.
An RS-232/RS-422 port allows the AMMA-2 to be accessed via personal computer. The ASCII command set, documented in the users manual, provides an easy way for users to write their own command and control software. Alternately, the AMMA-2 will be supported in the future by The Wizard Software, which provides unit control and graphing and logging capability for all the AMMA-2 measurements.
A remote alarm connector consisting of 8 pairs of relay contacts provides alarm status information for hard-wired applications. NRSC de-emphasis may be selected internally by moving a jumper plug.
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)
© Copyright 2013 Belar Electronics Laboratory, Inc. All rights reserved.
Specifications subject to change without prior notice.
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