User's Manual

Model 1150A DVOR
1-2 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.
Figure 1-2 Dual Doppler VHF Omni-range (DVOR) Station with DME
1.2
EQUIPMENT DESCRIPTION
The DVOR system provides a reference from which aircraft bearing can be determined. To do this, a carrier is
radiated in the 108 to 118 MHz band and modulated by two 30 Hz signals. One amplitude modulates and the other
frequency modulates (also called the reference phase and variable phase signals, respectively) the carrier signal.
This is done in such a way that the phase difference of the 30 Hz signals varies degree for degree with the magnetic
bearing around the VOR station.
The DVOR system consists of one electronics cabinet with sub-assemblies, a Portable Maintenance Data Terminal
(PMDT), one reference (carrier) antenna and 48 sideband antennas installed on a counterpoise, one field monitor
antenna, and interconnecting cables.
The DVOR electronics cabinet standard configuration uses convection cooling. No fans or blowers are installed in
the cabinet.
1.2.1
Electronics Cabinet
The 1150A VOR is contained in one (1) electronics cabinet measuring 24" wide, 24" deep and 72" high. It utilizes a
standard 19" rack configuration with a front panel door that covers and protects the equipment. The Model 1150A is
100% solid-state. Its internal circuitry is contained on plug-in type printed circuit card assemblies (CCAs) and RF
modules.
Refer to Figure 1-3 through Figure 1-6 which show the layout of the various modules within the Model 1150A
VOR cabinet. The paragraphs on the following pages provide a brief description of each of the modules and
its function in the system. Note that the cabinets shown are dual equipment systems. Refer to Figure 2-2 and
Figure 2-3 for the Model 1150A Doppler VOR system block diagram.