Belar FMM-4A

The Belar FMM-4A is an advanced digital FM frequency monitor designed for precise and automatic monitoring of broadcast transmitters. It incorporates a range of features to ensure accurate monitoring of FM carrier, pilot, and SCA frequencies.

Key Features:

1. High-Precision Frequency Monitoring:
   • Accurately monitors FM carrier, pilot, and SCA frequencies.
   • Provides reliable and precise frequency information critical for broadcast transmitter performance.
2. Large 3½-Digit LED Display:
   • Features a prominent display for easy reading of frequency measurements.
   • Displays a range of ±19.99 kHz for carrier, ±1999 Hz for SCA, and ±10 Hz for pilot.
3. LED Indicators for Monitoring:
   • Front panel LED indicators warn of low-level input or the loss of any monitoring frequency.
   • Enhances visibility and facilitates quick identification of potential issues.
4. Off-Frequency Alarm Logic:
   • Utilizes off-frequency alarm logic to prevent false alarms.
   • Inhibits off-frequency alarms until three successive errors are detected, ensuring accuracy in alarm indications.
5. Dual Alarm Levels for Carrier Deviations:
   • Two alarm levels provided for carrier deviations (±1 kHz and ±2 kHz).
   • Enables flexible monitoring based on specific deviation thresholds.
6. Invalid Count Alarm:
   • Includes an alarm to indicate an invalid count, triggered by too low an input level or counter malfunction.
   • Enhances reliability by alerting to potential measurement inaccuracies.
7. Optional Alarm Relay Board:
   • Offers an optional alarm relay board for expanded alarm functionalities.
   • Provides additional customization for specific monitoring requirements.
8. RF or LO and IF Inputs:
   • Supports RF or LO and IF inputs when used with compatible components like the RFA-4 or RFA-1A.
   • Enhances flexibility in system integration for comprehensive monitoring solutions.
9. FM Averaging Frequency Switch:
   • Includes an FM averaging frequency switch for tailored monitoring preferences.
   • Allows users to customize the monitoring approach based on specific requirements.

The Belar FMM-4A is a sophisticated solution for broadcast professionals, providing high-precision frequency monitoring with a range of customizable alarm features. Its LED display, off-frequency alarm logic, and multiple alarm levels contribute to accurate and reliable monitoring of FM frequencies, ensuring optimal transmitter performance.