NT 250 – 250W
Phase Locked Loop Programmable
FM Exciter/Transmitter 87.5 – 108 MHz Range
- Includes low pass/harmonic filter and can be used as a stand-alone transmitter
- Instant front panel programmability in 10 kHz increments
- All functions via LCD password protected
- Adjustable power output from 0 to 250 W with automatic power control
- Remote control features (optional) include: power on/off, fwd & ref power metering, ability to change frequency and Internal temperature metering
- Telemetry Output and FSK-ID Keyer (optional)
- FCC and Industry Canada Approved
TECHNICAL SPECIFICATIONS
- Rated Output Power: 0-250 Watts continuously variable (ALC)
- 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 5 ppm (± 500 Hz)
- Modulation Type: direct carrier frequency modulation
- Emission class: F3E
- Spurious & Harmonic Suppression: < – 80 dB or better
- Stereo Separation: 55 dB @ 1 Khz
- Distortion: < 0.1 % (typ. 0.05 %)
- Asynchronous AM S/N Ratio: 65 dB below reference carrier with 100%amplitude modulation at 400Hz
- without de-emphasis, no FM modulation present
- Synchronous AM S/N Ratio: 60 dB or better below reference carrier with 100% amplitude modulation at 400 Hz, without de-emphasis, FM modulation = ±75 kHz at 400 Hz
- AC Power Requirement: 117 or 230 V, ±10%, 50-60 Hz, single phase (Internally Selectable)
- Power Consumption: approx. 600 W from AC
- Panel Size: 483 mm (19″) W x 88 mm (3″) H (2 standard rack spaces high)
- Overall Depth: 410 mm (16″)
- Weight: 11 Kg (24 Lbs)
- Ambient Temperature Range: 0° to 50° C (32° to 122° F)
- Pre-emphasis: for FCC 75 μsec; for CCIR 50 μsec internally selectable
- Composite Operation
- Composite Inputs: four total, 1 for MPX and 3 for SCA
- MPX Input: 1 unbalanced BNC connector
- MPX Input Impedance: 2k ohm
- MPX Input Level: 3.5 Vp-p (1.237 Vrms/3.64 dBm)
- Composite FM unweighed S/N ratio: >68 dB below ±75 kHz deviation at 400 Hz measured in a
- 30 Hz to 100 kHz bandwidth with 75 μsec de-emphasis (RMS)
- Composite Total Harmonic Distortion: 0.05% typical
- Composite Intermodulation Distortion: 0.05%, measured with a 1 kHz and a 1.3 kHz tone, 1:1 ratio, at 100% modulation
- Baseband: 30 Hz – 60 Khz within 0.15 dB
- Crosstalk: Main to stereo subchannel and stereo subchannel to main >55 dB (60 dB typical)
- SCA Inputs: 3 unbalanced BNC connectors
- SCA Input Impedance: 10k ohm
- SCA Input Levels: 0 dBm (775 mVrms/2.2 Vp-p) nominal for ±7.5 kHz deviation, adjustable
- SCA Amplitude Response: ±0.8 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 Impedance: 600 ohm balanced or unbalanced; 50 dB common mode suppression
- Audio Input Level: 0 dBm (775 mVrms/2.2 Vp-p) for ±75 kHz, adjustable
- FM S/N Ratio: >70 dB below ±75 kHz, deviation at 400 Hz measured in a 30 Hz to 20 kHz bandwidth with 75 μsec de-emphasis (RMS)
- Audio Frequency Response: ±0.8 dB, 30 Hz to 15 kHz
- lntermodulation Distortion: 0.05% or less, measured with a 1 kHz and a 1.3 kHz tone, 1:1 ratio, at 100% modulation
