User's Manual

Model 1150A DVOR
1-8 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.
The switch positions start at 0 and increment by one until 15. Each position represents 22.5 degrees of antenna
rotation from the nominal position. At each position the Monitor CCA determines the azimuth angle at the Field
Monitor antenna location. From this data the errors are measured and a Fourier Analysis is performed to generate
the display data.
The error as determined during the ground check is analyzed to determine the bias, the duantal error, quadrantal
error and octantal error. The bias error is the average error around the station. The duantal error is sinusoidal with a
rate of one cycle in the 360 degrees around the station. The quandrantal error is sinusoidal with a rate of two cycles
in the 360 degrees around the station. The octantal error is sinusoidal with a rate of four cycles in the 360 degrees
around the station
A 4-pin header on the Commutator Control CCA may be strapped to enable/disable the DVOR automatic ground-
check as desired.
WARNING
Enabling the automatic ground-check test changes the signal in space and will cause unsafe
conditions for aircraft. A notice to airmen (NOTAM) must be issued prior to starting this
1.2.1.12
Battery Charging Power Supply (BCPS) Assembly (1A5A1, 1A5A2)
The BCPS assemblies provide regulated voltage to the transmitter from either the AC input or the batteries. The
BCPS assemblies are located in the third rack. The AC voltage is an input to the BCPS which converts to
approximately 50 Volts DC. The BCPS assemblies are also responsible for charging the batteries when AC is
present.
1.2.1.13
Carrier Power Amplifier Assembly (1A5A3, 1A5A4)
The Carrier Amplifier has one assembly. The Carrier Amplifier circuit card assembly, which is also the module’s
I/O, processes the control signals from the Audio Generator to properly control the desired output RF modulation
and amplitude. This assembly is capable of providing 100 Watts or more of Carrier power at up to 80% AM
modulation.
1.2.1.14
Interface CCA (1A9)
The Interface CCA provides interface connections between the RMS/Facilities/Control Backplane CCAs and the
outside world. Examples include spare analog and digital inputs, spare digital outputs, temperature sensors, smoke
detector, and intrusion sensor. RS232 communications are provided to RCSU and PMDT terminals as well as an
Ethernet module. All signals are protected by transient voltage suppression (TVS) devices on the Interface CCA
before exiting.
1.2.1.15
AC Power Monitor Assembly (1A6)
The AC Power Monitor CCA provides a means for the VOR system to measure the AC current and voltage levels of
the obstruction lights and of the VOR system itself. Provision for operating with a photo switch is incorporated. A
capability to bypass the photo switch for the obstruction lights is provided.
1.2.1.16
Commutator CCA (1A10, 1A11)
Each commutator CCA measures 15-7/8" high and 14-7/8" wide. There are two commutator CCAs installed in the
top of the electronics cabinet. They are located on the upper left and upper right side and may be accessed by
removing the cabinet side panels. The right (viewed from the front) commutator CCA is used to switch the RF
signals to all the odd antennas, and the left commutator CCA drives the even antennas. Each commutator has
twenty-six N type RF connectors and two 37-pin D-shell connectors.
1.2.2
Portable Maintenance Data Terminal (PMDT)
The standard PMDT consists of a laptop computer and is the input/output device for controlling and communicating
with the DVOR system. Station control, adjustment and monitoring functions are available through the computer,
and are accessed via a Windows-based operator interface. An optional external mouse may be used with the laptop
computer for ease in operation. An optional desktop PC is available as a substitute for the standard laptop computer.
Also, an optional printer is available for use with either the laptop or desktop PC.