Belar AMMA-1

BELAR "THE WIZARD", MODEL AMMA-1
PRECISION DIGITAL AM MODULATION MONITOR AND ANALYZER

DESCRIPTION

The Wizard is a 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. The Wizard Software (included with The Wizard) and a personal personal computer running DOS enable real-time graphing, logging, and remote operation.

The Wizard features user-defined parameters and settings for maximum flexibility. The two large UP/DOWN menu keys are used to cycle the 16 digit alphanumeric display to the desired menu; the UP/DOWN parameter keys are then used to select the desired setting. The configuration can be saved to non-volatile memory in the unit in the event of a power loss.

A unique "Normal Modulation" indicator allows you to ensure that your modulation is within the parameters that you specify.

An Audio loop-thru permits you to "touch up" your modulation remotely, through the RS-232/RS-422 port.

A built-in Audio Sentry audio failure alarm alerts you to loss of modulation.

SOFTWARE

The Wizard Software can operate the AMMA-1 remotely and is also used to display real-time graphs. A direct connection or a pair of modems and a phone line may be used. The software is fully password protected with three levels of access.

MEASUREMENTS

Total Positive Peak Modulation in Percent
Total Negative Peak Modulation in Percent
Positive Peaks-per-Minute Count
Negative Peaks-per-Minute Count
Positive Peak Average Modulation
Negative Peak Average Modulation
Positive Average/Peak Modulation Ratio
Negative Average/Peak Modulation Ratio
Positive Peak Minimum Modulation
Negative Peak Minimum Modulation
Normal Modulation Peaks-per-Minute Count
Carrier Level

SETTABLE PARAMETERS

Hold Time
Positive and Negative Peak Modulation Indicator
Positive and Negative Peaks-per-Minute Indicator
Normal Modulation Indicator
Display Hold
Display Blanking
Positive & Negative Peaks-per-Minute Duration
Carrier Shift Alarm
Remote Enable
Audio Failure Alarm - Time & Modulation
Audio Gain (+20%)
Time Mode (Real/Past)
Positive Peak Weighting
Calibrator
Controlled Carrier Operation
Relays can be set NO or NC

SPECIFICATIONS

RF Frequency Range 		     260 kHz to 50 MHz

RF Sensitivity 			     5 to 10 volts rms

RF Input Impedance 		     500 ohms or 50 ohms

Accuracy 			     1.0%

Display 			     Large 3 digit LED for

                                         Negative Modulation,

                                     16 segment alphanumeric LED display

                                         for menus and parameters

Frequency Response 		     +0.5 dB, 20 Hz to 25 kHz

Audio Outputs 

 Audio Monitor 	     		     + 10 dBm, 600 ohms, balanced (XLR)

 Audio Test 			     2.5 Vrms unbalanced (BNC)

 Frequency Response 		     +/-0.5 dBm 20 Hz to 25 kHz

 Distortion 			     0.25% max @ 99% modulation

 Signal to noise ratio 		     75 dB

Carrier Alarm 			     Fully adjustable

Carrier Shift Alarm 		     Fully adjustable

Automatic Carrier Level 

     Adjustment range 	             +/- 40%

Remote Meter output 		     Jack for optional MP-14

                                         analog remote meter panel

Remote alarms 			     Relays for Loss of Modulation,

                                         Negative PPM, Positive PPM,

    				         Loss of Carrier, Remote, General

Serial output 			     RS-232/RS-422

Power Requirements 		     115/230 VAC, 50/60 Hz, 20 VA

Dimensions 			     l 3/4"H x 14"D x 19" W (EIA rack mount)