Overview
Bext XT 500, 500 Watt Exciter/Transmitter
- 100, 150, 300, 500 and 700 W in highly efficient, lightweight, compact size cabinets
- Fast access to all readings & settings via front panel display and via optional LAN or WEB connection
- Telemetry Readings & Remote Control via standard connections and via optional webpage
- Instant frequency programmability directly from front panel setting
- Proportional Auto-Foldback of output power in the event of excessive VSWR
- Main parameters available also on rear DB 25 port for remote control
- Automatic power control maintaining the output at any pre-set level
- Available with optional built-in stereo generator
- Modular layout with plug-in, easily replaceable circuits and parts
- Can operate on 120 V AC or 208/240 V AC single phase
- Meets or exceeds all FCC and CCIR requirements
Specifications
General
Rated Output Power (APC controlled): 0-500W adjustable
RF Output Connector: “N” type female
RF Output Impedance: 50 ohm
Frequency Range: 87.5 MHz to 108 MHz
Frequency Programmability: direct from front panel in 10 kHz increments
Frequency Stability: better than ±500 Hz
Modulation Type: direct carrier frequency modulation
Spurious & Harmonic Suppression: meets or exceeds all FCC and CCIR requirements
Asynchronous AM S/N Ratio: 70 dB below reference carrier with 100% amplitude modulation at 400 Hz without de-emphasis, no FM modulation present
Synchronous AM S/N Ratio: 55 dB or better below reference carrier with 100% amplitude modulation at 400 Hz, without de-emphasis, FM modulation = ±75 kHz at 400 Hz
Transient Intermodulation Distortion: less than 0.1% measured with a 3.18 kHz square wave and a 15 kHz sine wave at 100% modulation (typical 0.05%)
AC Power Requirement: 120 or 208/240 V, 50 or 60 Hz, single phase.
AC Power Consumption (approx): 200 W (XT 100), 290 W (XT 150), 575 W (XT 300), 950 W (XT 500), 1300 W (XT 700)
RF Monitor Port BNC: -30 dB level
Panel Size: 483 mm (19″) W x 88 mm (3.5″) H (2 standard rack spaces high)
Overall Depth: 355 mm (14″)
Approximate Weight: XT100: 16Lbs (7Kg);XT150: 18Lbs (8 Kg); XT300: 20 Lbs (9 Kg); XT500: 25 Lbs (11 Kg); XT700: 28 Lbs (13 Kg)
Ambient Temperature Range: -10° to 50° C (14° to 122° F)
Pre-emphasis: for FCC 75 μsec; for CCIR 50 μsec; or flat for Stereo, all user selectable
Composite Operation
MPX Input: BNC and XLR connectors (selectable, w/ selectable impedance 10kohm – 600 ohm)
Stereo L + R Channel inputs: XLR w/ selectable impedance (for units with built-in stereo generator)
MPX Input Level: adjustable from – 13 to + 13 dBm, normally set to 3.5 Vp-p (1.237 Vrms / 4.1 dBm)
Composite FM S/N ratio: >80 dB below ±75 kHz deviation at 400 Hz measured in a 30 Hz to 100 kHz bandwidth with 75 μsec de-emphasis (RMS)
Composite Amplitude Response: ±0.5 dB, 20 Hz to 53 kHz; ±0.2dB, 53kHz to 100kHz
Composite Total Harmonic Distortion: <0.05%
Composite Intermodulation Distortion: <0.05%, measured with a 1 kHz and a 1.3 kHz tone, 1:1 ratio, at 100% modulation
Stereo Separation: >50 dB (60 dB typical)
Crosstalk: main to stereo subchannel and stereo subchannel to main >55 dB (60 dB typical)
SCA & RDS Inputs: 3 unbalanced BNC connectors
SCA & RDS Input Impedance: 10k ohm
SCA & RDS Input Levels: – 20 dBm to +10 dBm, adjustable
SCA Amplitude Response: ±0.2 dB, 40 kHz to 100 kHz
Crosstalk: 67 kHz SCA to main or to stereo subchannel >65 dB
Crosstalk: 92 kHz SCA to main or to stereo subchannel >70 dB
Monaural Operation
Audio Input: BNC w/ selectable impedance 10kohm – 600 ohm
Audio Input Level: adjustable from – 13 to + 13 dBm, normally set to 3.5 Vp-p (1.237 Vrms / 4.1 dBm)
FM S/N Ratio: >80 dB below ±75 kHz, deviation at 400 Hz measured in a 20 Hz to 20 kHz bandwidth with 75 μsec de-emphasis (RMS)
Audio Frequency Response: ±0.5 dB, 30 Hz to 15 kHz
Total Harmonic Distortion: <0.05% or better
lntermodulation Distortion: 0.02% or less, measured with a 1 kHz & a 1.3 kHz tone, 1:1 ratio, at 100% modulation
Other Connectors – 30 dB RF Monitor: BNC • Interlock: BNC • RS 232: DB 9 • Remote control: DB25 • Optional LAN/WEB connection: RJ45
