Selex Sistemi Integrati Inc. VOR2 User 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.
1-3
1.2.1.1 Local Control Unit (LCU) (1A1)
The Local Control Unit (LCU) is located in the upper portion of the VOR cabinet and provides station status
information. The LCU provides for Transmitter, Monitor and System setup, monitoring and control. Alarm
indication from the VOR Monitors initiates transfer or VOR shutdown.
1.2.1.2 Synthesizer Assembly (1A3A1, 1A3A11)
The Synthesizer assembly generates three RF signals (carrier, upper and lower sidebands) for the VOR transmitter.
There are three boards in the Synthesizer Assembly. The Carrier board provides the carrier frequency and phase
control capability for the Carrier Amplifier. The sideband board generates upper and lower sideband frequencies for
the Sideband Amplifier Assemblies. The third board (Interface) provides connectivity to the backplane and includes
digital interface circuitry to the Audio Generator and RMS processors.
The Local Control Unit (LCU) is located in the upper portion of the VOR cabinet and provides station status
information. The LCU provides for Transmitter, Monitor and System setup, monitoring and control. Alarm
indication from the VOR Monitors initiates transfer or VOR shutdown.
1.2.1.2 Synthesizer Assembly (1A3A1, 1A3A11)
The Synthesizer assembly generates three RF signals (carrier, upper and lower sidebands) for the VOR transmitter.
There are three boards in the Synthesizer Assembly. The Carrier board provides the carrier frequency and phase
control capability for the Carrier Amplifier. The sideband board generates upper and lower sideband frequencies for
the Sideband Amplifier Assemblies. The third board (Interface) provides connectivity to the backplane and includes
digital interface circuitry to the Audio Generator and RMS processors.
1.2.1.3 Audio Generator CCA (1A3A2, 1A3A9)
The Audio Generator CCA is responsible for developing and controlling the audio signals, generating the carrier
modulation signals and monitoring and controlling RF power level and phase control signals used in the DVOR. In
addition, DC analog voltages representing different modulation and power levels of the DVOR RF signals are
applied to, and analyzed by, the audio generator to determine carrier power levels, carrier percent modulation,
sideband power levels and VSWR. An on-board micro controller and memory circuitry controls all functions within
the CCA and communication through the serial connection to the RMS CCA.
The Audio Generator CCA is responsible for developing and controlling the audio signals, generating the carrier
modulation signals and monitoring and controlling RF power level and phase control signals used in the DVOR. In
addition, DC analog voltages representing different modulation and power levels of the DVOR RF signals are
applied to, and analyzed by, the audio generator to determine carrier power levels, carrier percent modulation,
sideband power levels and VSWR. An on-board micro controller and memory circuitry controls all functions within
the CCA and communication through the serial connection to the RMS CCA.