User's Manual

Model 1150A DVOR
1-16 Rev. - November, 2008
This document contains proprietary information and such information may not be disclosed
to others for any purposes without written permission from SELEX Sistemi Integrati Inc.
1.2.6 Equipment Shelter
The electronic part of the DVOR (transmitter cabinet and commutator rack) is housed in a shelter environmentally-
controlled with heating, cooling and ventilation. Normally, the shelter is installed below the counterpoise and
directly underneath the carrier antenna.
1.2.7
Battery Backup Unit (Optional)
The battery backup supply contains two battery boxes each containing two lead-acid maintenance-free batteries in a
48VDC configuration. Additional backup capacity can be achieved by adding additional groups of four batteries.
1.3
EQUIPMENT SPECIFICATION DATA
Equipment specifications are listed in Table 1-1.
1.3.1
Transmitter and Antenna System
1.3.1.1 Transmitter
Table 1-1 DVOR Equipment Specifications (Transmitter)
Parameter Specification
Carrier Frequency Range: 108 to 118 MHz with 50 kHz channel spacing.
Frequency Control: Synthesizer
Carrier Frequency Tolerance: ±0.0005% (5 PPM)
Carrier Output Power: Transmitter output power adjustable from 25 to 100 Watts (14 to 20 dBW) in 1
Watt increments
Effective Radiated Power: 23 dBW minimum with a transmitter output of 100 Watts
Carrier Level Shift: less than 0.5% for modulation depth up to 80%
Duty Cycle: Continuous
Spurious Outputs: greater than 77 dB below the carrier at 30% modulation
Harmonic Radiation: Meets or exceeds U.S. FCC requirements. Harmonics of 9960 Hz meet or
exceed:
Second harmonic >30 dB lower than fundamental
Third harmonic >50 dB lower than fundamental
Fourth and higher harmonics >60 dB lower than fundamental
Hum and Noise: With voice, VOR reference and identification inputs, hum and noise on the
carrier are more than 30 dB below the audio level equivalent of 30%
modulation.
Maximum Range: Line-of-sight, 175 nautical miles at 37,500 feet (11,433 M) above the facility.
Accuracy: When site meets requirements of ICAO, bearing information on the
horizontally-polarized radiation is within ±1.0° (at a distance of approximately
1000 feet (300 meters) for all elevation angles between 0 and 60 degrees,
measured from the center of the VOR antenna.