BELAR FMSA-1 FM DIGITAL STEREO MONITOR/ANALYZER
The FMSA-1 is a DSP-based, microprocessor-controlled, FM Stereo Modulation Monitor/ Analyzer. The FMSA-1 digitizes the composite baseband signal and decodes the stereo multiplex portion using digital signal processing techniques. Unlike an analog design, a DSP-based design is immune to variations due to temperature or the aging and tolerance of components. As a result, the FMSA-1 attains superlative performance while requiring virtually no adjustment. By employing linear-phase FIR filters, the FMSA-1 eliminates phase distortion in the recovered audio. This permits unprecedented accuracy in measuring modulation peaks on the Left, Right, L+R and L-R signals. These performance advances result from the mathematically pure demodulation algorithm implemented by the FMSA-1 processors.
All FMSA-1 measurements--peak modulations, injections, and dB ratios--are displayed on digital readouts. The readings can also be viewed remotely on a virtual front panel when the FMSA-1 Digital FM Stereo Monitor/Analyzer is used in conjunction with the Belar Wizard FMMA-1 FM Digital Modulation Monitor/Analyzer and a personal computer. Remote operation of the FMMA-1/FMSA-1 pair in tandem with an automatic audio analyzer facilitates a fully automated stereo proof-of-performance.
The FMSA-1 features user-defined parameters and settings for maximum flexibility. The two 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.
When used in combination with the Belar FMMA-1 Wizard and The Wizard Software, the FMSA-1 offers unusual flexibility in remote as well as on-site monitoring. The Wizard Software transforms an ordinary PC into a powerful tool for the real-time graphic display and logging of modulation parameters. When tied to the companion FMMA-1--directly or through modems and a standard phone line--the PC can interrogate and control all functions of the FMSA-1. Passwords allow the restriction of control at three levels.
With the addition of the Belar RFA-4 Frequency Agile FM RF Amplifier to the monitoring system, The Wizard Software permits the remote selection of monitored stations from among 10 preset frequencies or those entered directly by the user. Call letters of preset stations appear on the computer screen for easy identification. Users may also write their own software for controlling and interrogating the FMSA-1 directly through its own RS-232 port.
All dB measurements can be made with or without de-emphasis.
Input Level 2.8V- 5.7V P-P composite Input Impedance 100 k , unbalanced, BNC connector Display Two large 3 digit 7 segment LED for Left and Right (or L+R and L-R) Modulation 16 segment alphanumeric LED display for menus and parameters Modulation Display Range 0-127% in 1% increments, accuracy ±0.5% Pilot Injection Range 0-12.7% in 0.1% increments Outputs Pilot 2V P-P, 500 , unbalanced Left and Right Audio (Program) +10 dBm, 600 , balanced Test 2.5 Vrms, 75 unbalanced Scope 1.3 Vrms, 75 unbalanced Digital AES/EBU, 48 kHz Separation Left to Right 80 dB, 10 Hz to 15 kHz Right to Left 80 dB, 10 Hz to 15 kHz Crosstalk: L + R to L - R, L + R to L - R (matrix) 80 dB min L + R to L - R, L + R to L - R (direct) 90 dB min SCA to L + R 90 dB min SCA to L - R 90 dB min SCA Interference 90 dB min Serial Interface RS-232 Unit Interface Wizard Standard Interface Remote Meter Outputs: Left Channel Analog Meter, Right Channel Analog Meter, Pilot LED, Pilot Relay for interface to Model MP-15 Analog Meter Panel (optional) Audio Output Specifications Frequency Response, Left and Right ±0.05 dB flat, 50 to 15 kHz ±0.25 dB de-emphasized Signal-to-Noise Ratio, with de-emphasis Left and Right 90 dB Harmonic Distortion 0.01% max, 50 to 15 kHz Intermodulation Distortion 0.01% max (SMPTE) Dimensions 1 EIA Rack Unit 1.75"H x 14"D x 19"W Power Requirements 25 watts, 100-240 VAC, 50-60 Hz Shipping Weight 12 lbs
© Copyright 2000 Belar Electronics Laboratory, Inc. All rights reserved. Specifications subject to change without prior notice.
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