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:
- High-Precision Frequency Monitoring:
- Accurately monitors FM carrier, pilot, and SCA frequencies.
- Provides reliable and precise frequency information critical for broadcast transmitter performance.
- 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.
- 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.
- 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.
- 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.
- 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.
- Optional Alarm Relay Board:
- Offers an optional alarm relay board for expanded alarm functionalities.
- Provides additional customization for specific monitoring requirements.
- 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.
- 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.
