Bext XT 300, 300 Watt Exciter/Transmitter

Bext XT 300, 300 Watt Exciter/Transmitter - LPFM FCC Certified

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
LPFM FCC Certified
Meets or exceeds all FCC and CCIR requirements

General

Rated Output Power (APC controlled): 0-300W 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): 575 W (XT 300)
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: XT300: 20 Lbs (9 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