User's Manual

Model 1150A DVOR
2-40 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.
Ethernet module J9 has an RJ45 connector, is TVS-protected by U4 through U6, is powered by DC-DC converter
PS1, and has its TTL signals converted to RS232 by U7 before routing eventually to the RMS CCA. Diodes CR41
through CR43 insure the proper voltage level before entry into PS1. PS1 converts +24VDC to +3.3VDC and diode
CR72 provide TVS protection.
All TACAN antenna system controller signals are TVS-protected by diodes CR45 through CR67 before routed to
DB37 connector J3.
Test header J8 is used for factory testing.
The RCSU has two possible paths for communications; either tip-n-ring to terminal block TB2-1 and TB2-2 or
RS232 to DB9 connector J5. The active path is configured by a system configuration DIP switch on the Control
Backplane CCA. Diodes CR21 through CR24 provide TVS protection for the RS232 signals while resistors R21
through R24, spark-gap V2, sidactor Q3, and balun L2 provide the TVS protection for the tip and ring signals.
The PMDT also has two possible paths for communications; either tip-n-ring to terminal block TB2-3 and TB2-4 or
RS232 to DB9 connector J6. The active path is configured by a system configuration DIP switch on the Low Power
Backplane CCA. Diodes CR25 through CR28 provide TVS protection for the RS232 signals while resistors R17
through R20, spark-gap V1, sidactor Q2, and balun L3 provide the TVS protection for the tip and ring signals.
Spare I/O terminal block TB1 provides connection to ten spare analog inputs, four spare digital outputs, and four
spare digital inputs. All of these signals are TVS-protected by diodes CR1 through CR18. All of these signals
eventually route to the Facilities CCA.
External interconnect terminal block TB2 provides connection for the remainder of the signals of the Interface CCA.
The SMOKE_DETECTOR and INTRUSION_SENSOR signals are TVS-protected by diodes CR37 and CR38. The
ILS-VOR RS-232 signals are TVS-protected by diodes CR19 and CR20.
The INTERLOCK+ and INTERLOCK- signals are connected to opto-coupler U3:A. Full power supply isolation can
be achieved by removing jumpers JP1A and JP1B from header JP1 if the customer is willing to provide an external
supply. Current is set and steered through the LED of U3:A by resistors R14 through R15 and diodes CR36 and
CR69. The transistor output of U3:A is TVS-protected by diode CR39.
The EXT_KEY_IN+ and EXT_KEY_IN- signals are connected to opto-coupler U3:B. Full power supply isolation
can be achieved by removing jumpers JP2A and JP2B from header JP2 if the customer is willing to provide an
external supply. Current is set and steered through the LED of U3:B by resistors R5 through R7 and diodes CR32
and CR70. The transistor output of U3:B is TVS-protected by diode CR40.
The EXT_KEY_OUT signal is TVS-protected by diode CR35 before routing to pull-down resistor R9 and transistor
Q1. Resistors R10 and R11 bias the LED of opto-coupler U2 while diodes CR33 and CR34 transient protect the
transistor outputs of opto-coupler U2. The transistor outputs are labeled EXT_KEY_OUT+ and EXT_KEY_OUT-
before routed to terminal block TB1.
The MON1_AUDIO_ID and MON2_AUDIO_ID are transient protected by diodes CR30 and CR31 before being
voltage-divided by resistors R1/R3 and R2/R4. The lower voltage level signals are called DET_IDENT1 and
DET_IDENT2 before being routed to terminal block TB2.
2.3.2.13
AC Power Monitor CCA Theory
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.