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.
2-35
U31 and U32 buffer the power OK signals of the Carrier Amplifier CCAs, Sideband Amplifier CCAs, RF Monitor
a
nd two BCPS CCAs as well as the A-D status signal, the INTERLOCK signal, the ~FANS_OK signal, the
SMOKE_DETECTOR signal, and the INTRUSION_SENSOR signal. All of these signals originate at various cards
in the three racks in the VOR except the last four signals, which originate at the Interface CCA.
The U18 buffer reads the frequency select switches, which reside on the Control Backplane CCA and determine the
operating frequency of the VOR system.
The U22 latch controls the 32 channels of analog signals through multiplexers U20 and U21 as well as A-D
convert/address and PWR_OK indicator. The U23 latch provides the spare digital outputs of the Interface CCA after
buffering by U24 as well as the Ident tone multiplexer control and the fans (if installed) on/off signal through
transistor Q2. Test header J1 is used for factory testing only.
Figure 2-13 Facilities CCA Block Diagram