User's Manual

Model 1150A DVOR
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.
1-7
1.2.1.4
Monitor CCA (1A3A3, 1A3A10)
The Monitor CCA amplifies the RF input from the field monitor antenna, then band pass filters and analyzes the
signals. The parametric data is displayed on the PMDT and the Monitor CCA initiates an alarm status indication to
the LCU if the DVOR fails to operate within specified limits.
1.2.1.5
Low Voltage Power Supply (LVPS) CCA (1A3A4, 1A3A8)
There are two LVPS assemblies used in the transmitter cabinet. LVPS 1A3A4 is the low voltage power supply for
transmitter 1 and 1A3A8 is the LVPS for transmitter 2. Each LVPS is identical in construction and operation. Each
is interchangeable with the other.
1.2.1.6
Test Generator CCA (1A3A5)
The Test generator CCA performs two functions. Its primary function is to provide a standard reference signal to
the DVOR monitors for calibration whenever directed by the RMS CPU for monitor integrity testing.
The secondary function is an operator maintenance function, which allows test signals to be sent to the monitor(s),
as directed by an operator through the PMDT. The operator can vary signal parameters (i.e., voice band audio
frequency, percent modulation, phase shift, etc.) to determine if a monitor is functioning properly and will alarm at
the required settings.
1.2.1.7
Remote Monitoring System (RMS) Processor CCA ( 1A3A6)
The Remote Monitoring System (RMS) Processor CCA controls the transmitter and monitoring systems. The RMS
CCA performs communications via thirteen serial ports plus a parallel port, and facilitates monitoring/control in a
single or dual VOR system. The RMS CCA receives battery-backed DC power from the BCPS.
The RMS CPU contains a micro controller, RAM, EPROM, EEPROM, bus control and power monitor circuitry. It
processes the system status, directs communications with the outside world, and communicates with the DVOR
monitor and audio generator assemblies.
1.2.1.8
Facilities CCA (1A3A7)
The Facilities CCA provides system I/O for the Remote Monitoring System CCA. Many of the inputs and outputs of
the Facilities CCA eventually connect to the Interface CCA after routing through the Control Backplane CCA.
System battery-backed power supplies (nominally 48VDC) enter and are regulated down into several lower
voltages; including +24V, ±15VDC, ±12VDC, +5VDC, and +3.3VDC.
1.2.1.9
Sideband Amplifier Assembly (1A4A1, 1A4A2, 1A4A6, 1A4A7)
The Sideband Amplifier Assemblies are located in the middle rack (1A4) of the DVOR cabinet. Each Sideband
Amplifier contains one CCA and generates two separate RF signals. Both signals are either above the carrier
frequency or below the carrier frequency by 9960 Hz.
1.2.1.10
RF Monitor Assembly (1A4A4)
The RF Monitor assembly is located in the middle rack (1A4) of the DVOR cabinet. The RF monitor assembly
functions as an RF detector/amplifier and distributor of the detected RF signals. The RF monitor assembly has a
high power dummy load for the carrier mounted to a heat sink that is attached to the assembly chassis. There are
four sideband dummy loads.
1.2.1.11
Commutator Control CCA (1A4A5)
The Commutator Control CCA connects to a 25 conductor cable on the backplane CCA. This cable
originates from one of the two Audio Generators in the Control rack. The output of the Commutator
Control CCA exits onto the backplane and to two 40-pin connectors that connect to ribbon cable from the
Commutator CCAs.
Capability for the ground performance check of the antennas and commutator switching is provided. This check is
automatic after it has been started by the technician and therefore is called an Automatic Ground Check system.
When started, the Monitor CCA sends a switch position code to the Commutator control CCA via the 25-pin cable
originating at the Control rack.