- Main Features:
- NEW Now available with optional built-in multiband high performance Audio Processor
- Easy access to settings, functions and readings via touch screen color display and via web page
- Built-in User Manual file always accessible via front panel port even when AC power is disconnected
- Options include AES-EBU Digital Audio Input, Dynamic RDS/RBDS Encoder, Audio Over IP, SNMP2
- Newest high efficiency, high ruggedness LD MOS devices capable of withstanding 65:1 VSWR
- Conservatively rated, easily replaceable, highly efficient power supplies
- Proportional Auto-Foldback of RF output power protection in the event of excessive VSWR
- Excellent audio performance and built-in Stereo Generator with fast acting audio limiter
- Up to six available user-programmable profile presets for use as a backup of multiple FM stations
- Programmable FSK ID Keyer by software for use as auto-ID of Translators or Boosters
- Optional 10 MHz Ext Ref port + 1 pps port for Phase Locking & Time Delay Adj. to sync boosters or SFNs
- Highly efficient transmitters with low power consumption and low heat generation
- All Bext FM transmitters include low pass/harmonic filter and meet or exceed all FCC requirements
- Specifications:
- RF Specifications
- Nominal RF Output Power: 6000 W adjustable from menu or via webpage
- Power control stability: Better than 0.1 dB
- RF Output: 1 5/8” EIA Flange (or 7/8” EIA Flange on request) 50 W unbalanced.
- Frequency range: 87.5-108 MHz, front panel programmable or via webpage, 10 kHz steps
- Reference: 10 MHz TCXO
- Off-lock attenuation: > 80 dBc
- Start-up time: Typically 5-10 seconds
- Type of modulation: F3E / F8E direct FM at carrier frequency
- Frequency deviation: Nominal ±75 kHz
- Accuracy of deviation: < ± 2 dB from 87.6 to 107.9 MHz
- Frequency drift: £ 1 kHz/year MAX (due to internal TCXO aging).
- Short term stability: ± 1 ppm from -5 to +45 °C (100 Hz @ 100 MHz)
- RF Harmonics: Exceeds EBU/CCIR/FCC requirements
- RF Spurious: Exceeds EBU/CCIR/FCC requirements - Audio General Specs
- Preemphasis: Selectable Flat / 50 / 75 micros.
- Preemphasis Precision: Better than ± 0.5 dB
- Wideband Amplitude Response: ± 0.2 dB 30 Hz to 100 kHz
- Wideband AM Asynchronous: < -68dB, typ. -80dB
- Wideband Distortion, THD: < 0.1% (typ. 0.05%)
- WB Distortion, IMD: < 0.1% (typ. 0.05%)
- WB Transient IMD: < 0.25% (square/sine wave) - Composite & Mono Specs
- S/N: Typical Values referred to ± 75 kHz
- Weighted (CCIR 468/2 – Peak CCIR detector) – 75 dB / 50 ms – 69 dB / flat
- Weighted (CCIR 468/2 – RMS detector) – 79 dB / 50 ms -72 dB / flat
- Unweighted (RMS detector, meas. 20 Hz-23 kHz) – 86 dB / 50 ms – 80 dB / flat (stereo)
- Unweighted (RMS detector, meas. 20 Hz-23 kHz) – 92 dB / 50 µs – 88 dB / flat (mono)
- IMD: 70 Hz / 6 kHz 4:1 RATIO < 0.03% measured with 1 kHz and 1.3 kHz tones, 1:1 ratio @ 75 kHz deviation
- Transient IM: < 0.03 % (square/sine)
- Audio response: ± 0.15 dB 20 Hz to 15 kHz
- AM Synchronous: < -69 dB
- AM Asynchronous: < -70 dB (typ. -85 dB)
- Common mode rejection: > 45 dB typical, 25 Hz to 15 kHz - Built-in Stereo Gen. Specs
- Stereo System: EBU/CCIR/FCC standard “Pilot Tone System”
- Pilot Tone Frequency: 19 kHz ± 1 Hz
- Pilot Tone Deviation: ± 7 kHz nominal
- 38 kHz Suppression: > 70 dB (typ. 85 dB)
- 38 kHz Tone Generation: Internal Crystal
- 38 kHz Tone Precision: 38 kHz ± 2 Hz
- Phase response: 19/38 kHz 0°± 2°, internally adjustable
- Stereo Separation: 30-80 Hz >53 dB, 80 Hz-15 kHz >60 dB
- Crosstalk attn. (M / S): > 40 dB, 40 Hz to 15 kHz (typ. 55 dB, 100 Hz to 8 kHz)
- Audio Spurious Products: > 53 kHz < 50 dB
- THD on L & R channels: < 0.03%, 30 Hz-15 kHz
- Audio Filter Attenuation: > 55 dB @ 19 kHz; >45 dB 19 to 50 kHz; > 50 dB to 100 kHz (typ.) - Audio Inputs (on rear panel)
- Baseband / Composite / MPX Input: 1 BNC connector, unbalanced, 2 kW.
- Input level range for 75 kHz Deviation: – 6 to +12 dBm, adjustable from menu
- SCA / RDS / AUX Input: BNC connector, unbalanced, 2 kW. Input level range: – 6 to +12 dBm, adjustable from menu
- L&R or Mono Input: 2 XLR connectors, 600W balanced or unbalanced, switchable, or 10kΩ unbalanced, input level range for 75 kHz Deviation: -6 to +12 dBm, adjustable from menu
- AES-EBU input (optional) XLR connector and optional optical connector - Other Connectors (on rear panel)
- 19 kHz Output: 1 BNC connector, unbalanced, Pilot tone 2 Vpp 19 kHz
- Baseband / Composite / MPX Output: 1 BNC connector, unbalanced
- DB25 for Analog Telemetry & Remote Control
- RJ 45s: LAN / WEB connection, optional VOIP, optional SNMP2
- USB A: for SNMP2 Software
- DB9: RS485 for interconnection w/ other units
- SMAs for 10 MHz external reference port and for 1 pps port (optional) - Front Panel Connectors
- USB C or micro: Front panel port to access user manual file & other technical test reports
- RF Monitor: -36 dBc ±3 dB, 50 W BNC - Environmental
- Storage temperature: -20°C to + 60 °C
- Operating temperature: -10°C to + 45°C
- Relative humidity: 90% (non-condensing)
- Max operating altitude: 3000 m.
- Max ambient field strength: ≤3 V/m; ≤ 4 A/m
- Cooling: Forced air (easily replaceable fans) - Physical & Electrical
- Front panel: 483mm (19″) W x 178mm (7”) H (four standard rack spaces high)
- Cabinet depth from front panel: approximately 590 mm (23 1/4”)
- Approximate Weight: 70 lbs (32 Kg)
- Approx. Packed Weight: 110 lbs (50 Kg)
- AC Power Requirement: 220V [±15%] single or three phase, 50/60Hz.
- Approx. Power Consumption @ Full PWR: 8200 VA - Available Readings include
- FWD PWR
- RFL PWR
- Frequency
- Audio Presence
- Deviation
- Preemphasis Status
- Audio Input Selection
- L & R Channels Modulation Level
- Stereo Generator Enabled / Disabled
- Audio Limiter Enabled / Disabled
- VPA
- IPA
- Temperature
- Efficiency
- Status of FSK ID Keyer and many other readings & functions - Notes
- All Bext products’ features & specifications are subject to change without notice
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