Summary
Davicom’s AM/FM Broadcast Monitor offers a surprising number of advanced features in a compact, low-cost package. Remotely controllable through Davicom’s line of intelligent site monitoring systems, the FMBM can also be manually configured and operated.
Designed for full and easy integration into the powerful control and monitoring structure, the FMBM gives you the benefit of remotely monitoring the key RF parameters of your AM or FM transmitter to ensure regulatory compliance.
Features
It offers the following features:
- Synthesized tuning
- Non-volatile configuration storage
- On-site monitoring of transmitter power
- Off-air monitoring of receive signal strength
- FM deviation measurement and alarms
- Carrier frequency measurement and alarms
- RDS/RBDS decoding
- Balanced audio output on back panel and headphone output on front
- All alarms levels are settable by the user, locally or remotely
- Full remote control and monitoring through any Davicom with USB interface
- Alarm contacts for: stereo absence, high deviation, low deviation, low power, carrier frequency, drift.
Technical Specification
Technical Specification
| FMBM Specifications | ||
| AM band | Tuning range | 520-1710 kHz |
| Tuning Step | 1 or 10 kHz selectable | |
| FM band | Tuning Range | 88-108 MHz |
| Tuning Step | 200, 100 or 50 kHz selectable | |
| Program de-emphasis | 50 or 75uS as set by internal jumper | |
| Low-level input | Connector | F |
| Input range | -70 to -33 dBm | |
| High-level input | Connector | BNC |
| Input range | -16 to +20 dBm | |
| Carrier frequency drift measurement | Accuracy | ± 0.3ppm for a temperature range of 0 to 50°C |
| Resolution | 100 Hz | |
| RDS/RBDS decoder | Type | PS, PTY, RT |
| Audio outputs | Type | Balanced |
| Output impedance | 600 ohms | |
| Connector | Pluggable screw terminal | |
| Level | Preset to +8dBm and adjustable from 0 to +10dBm | |
| Headphone output | Load impedance | > 8 ohms |
| Connector | 3.5mm | |
| FM deviation monitor | Connector | Pluggable srew terminal |
| Output impedance | 600 ohms | |
| Level | 0 to 5 Vdc for 150 kHz deviation | |
| RF power monitor | Connector | Pluggable screw terminal |
| Output impedance | 600 ohms | |
| Level | 0 to 7 Vdc | |
| Alarm relaysNormally open isolated contacts that can be individually set to normally closed by internal jumpers | Connector | Pluggable screw terminal |
| Alarm functions | Low-powerFrequency driftHigh deviationLow deviation
Stereo absence |
|
| USB interface | Functions | Allows remote control and continuous alarm monitoring through compatible Davicom unitsAlso used for firmware upgrades |
| Software remote control | Through DV Units | Audio level adjustment (rear connection)Frequency BandFM peak-deviation limitFM deviation peaks-per-minute count
FM low-deviation limit FM low-deviation timeout FM frequency-drift limit FM RF alignment Low-power limit AM low-modulation limit AM low-modulation timeout |
| Manual control | Via front panel pushbuttons | Same functions as via software remote control above plus:RF input selectionHeadphone volume adjustmentPower reference level |
| Dimensions | 1 RU, half width | |
| Weight | 1.0 kg (2.2 lbs) | |
