FM FREQUENCY MONITOR BELAR FMM-4A

The Belar FMM-4A is a high-precision digital FM frequency monitor specially designed for automatic monitoring of broadcast transmitters.

The counter accurately monitors FM carrier, pilot and SCA frequencies. A large 3½-digit LED display provides a range of ±19.99 kHz for carrier, ±1999 Hz for SCA and ±10 Hz for pilot. Front panel LED indicators are provided to warn of low level input or loss of any monitoring frequency. To prevent false alarms, the FMM-4A inhibits off-frequency alarms until three successive errors are detected. Two alarm levels are provided for carrier deviations. An alarm is also provided to indicate an invalid count, which could result from too low an input level or counter malfunction. An optional alarm relay board is available.

FEATURES:

• RF or LO and IF inputs (when using RFA-4 or RFA-1A).
• – ±1 kHz Off Frequency Alarm
• ±2 kHz Off Frequency Alarm
• Low Level Alarm
• FM Averaging Frequency Switch
• ±2 Hz Off Frequency Alarm
• Low level alarm
• Low level alarm
• Invalid count alarm
• Large 3½ digit LED display