FMSA-1 FM STEREO MODULATION MONITOR
Description
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 Fl R 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. he 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.
Features
- Total Peak Modulation in Percent or dB
- Left/Right Channel Modulation in Percent or dB
- L+R/L-R Modulation in Percent or dB
- Pilot Modulation in Percent
- Pilot Injection in 0.1 Percent
- Direct Reading Separation in dB
- Crosstalk in dB
- 38 kHz Subcarrier Suppression in Db
Specifications
Input
- Input Level
- 2.8V - 5.7V P-P composite
- Input Impedance
- 100 KΩ, unbalanced, BNC connector
Display
- 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 Ω, unbalanced
- Left and Right Audio (Program)
- +10 dBm, 600 Ω, balanced
- Left and Right Test
- 2.5 Vrms, 75 Ω, unbalanced
- Left and Right Scope
- 1.3 Vrms, 75 Ω, 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
Interfaces
- 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 M-15 Analog Meter Panel (optional)
Audio Output Specifications
- Frequency Response — Left and Right
-
±0.05 dB flat, 50 Hz 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 Hz to 15 kHz
- Intermodulation Distortion
- 0.01% max (SMPTE)
Packaging
- Dimensions
-
1 EIA Rack Unit
1.75" H × 14" D × 19" W - Power Requirements
-
25 watts, 100-240 VAC,
50-60 Hz - Shipping Weight
- 12 lbs
Downloads
Operator Manual
Complete operating instructions, setup information, controls, connections, and technical information for the FMSA-1.
View Manual →Software & Updates
Download current FMSA-1 software and review available updates.
Software Updates →