Technical Handbook
Table Of Contents
- 1 General Information
- 1.1 Introduction
- 1.2 Product Type Numbers
- 1.3 Abbreviations
- 2 Physical Organization
- 2.1 Module and Assembly Location
- 2.2 Service Kit Assembly
- 2.3 Power Supply
- 3 System description
- 3.1 Overview
- 3.2 Physical Description
- 3.3 Monitors
- 3.4 Transmitters / Modulators
- 3.5 TX Control
- 3.6 Remote Monitoring (RMS) Unit
- 3.7 Remote Control Unit
- 3.8 Remote Slave Panel
- 3.9 Remote Maintenance Monitoring (RMM)
- 4 Technical Specifications
- 4.1 Signal Minimum Performance GP
- 4.2 Environmental Characteristics
- 4.3 EMC Characteristics
- 4.4 Mechanical Characteristics
- 4.5 Power Supply
- 5 Mechanical Installation
- 5.1 Mounting Kit MK1343A
- 5.2 Moving RF Connectors
- 6 Electrical Installation
- 6.1 Connection Overview
- 6.2 Power and Battery
- 6.3 RF Inputs
- 6.4 RF Outputs
- 6.5 DC Loop (Localizer only)
- 6.6 Remote Control
- 6.7 PC and Modem
- 6.8 DME (localizer only)
- 6.9 For the Fernau 2020 DME the following connection is recommended
- 6.10 Analog Inputs
- 6.11 Digital Inputs and Outputs
- 6.12 Battery Warning
- 6.13 Remote control connections
- 6.14 Automatic shutdown of GP
- 6.15 Remote slave connection
- 6.16 Interlock switch connection
- 7 Tests and Adjustments
- 7.1 Configuration Settings
- 7.2 Technical note - Leased Line Setup for Remote Control (Westermo)
- 7.3 Transmitter Alignments and Calibration
- 7.3.1 RF Phase Feedback Adjustment
- 7.3.2 RF Power
- 7.3.3 LF Phase Adjustment
- 7.3.3.1 One-frequency system
- 7.3.3.2 Two-frequency system
- 7.3.4 RF Power Balance Adjustment
- 7.3.5 RF Phase at Combiner I/P
- 7.3.6 SDM Calibration
- 7.3.7 DDM Calibration
- 7.3.7.1 Test DDM Setting
- 7.3.8 Ident Tone Modulation Depth
- 7.3.8.1 Method 1
- 7.3.8.2 Method 2
- 7.3.9 RF Frequency Adjustment
- 7.4 Antenna System Adjustments
- 7.5 Monitor Alignment and Calibration.
- 7.6 Monitor Alarm Setting Procedure
- 7.7 Maintenance Limit Adjustments
- 7.8 Adjustment points
- 8 Functional Description
- 8.1 Introduction
- 8.2 Transmitter
- 8.3 Monitor
- 8.4 Transmitter Control
- 8.5 Remote control system
- 8.6 Remote Monitoring System (RMS)
- 8.7 Power Supply
- 9 Detailed description
- 9.1 Main Cabinet
- 9.1.1 MF1219A Glidepath Monitor Frontend
- 9.1.2 MO1212A Monitor
- 9.1.2.1 NMP101A Monitor Digital Frontend
- 9.1.2.2 NMP102A / NMP103A Comparator
- 9.1.3 TCA1218A Transmitter Control Assembly
- 9.1.3.1 NMP104A Station Control Monitor Data Detector
- 9.1.3.2 NMP105A Station Control Event Detection
- 9.1.3.3 NMP106A Station Control State Machine Control
- 9.1.3.4 NMP107A Terminator
- 9.1.3.5 NMP109A Remote Control Interface
- 9.1.4 LF1223A Low Frequency Generator
- 9.1.4.1 NMP110A Low Frequency Generator Control
- 9.1.5 OS1221B RF Oscillator
- 9.1.6 GPA1231A Glidepath Course Power Amplifier Assembly
- 9.1.7 GPA1232A Glidepath Clearance Power Amplifier Assembly
- 9.1.7.1 PA1234A Power Amplifier
- 9.1.7.2 AC1226A Amplitude control
- 9.1.7.3 PC1225B Phase Control
- 9.1.7.4 FD1236A Feedback Detector
- 9.1.7.5 FD1224A Feedback detector
- 9.1.7.6 CD1238A Combiner Detector
- 9.1.8 COA1207C Change-Over Assembly
- 9.1.9 PS1227A Power Supply
- 9.1.10 RMA1215A RMS Assembly
- 9.1.11 CI1210A External Connection Interface
- 9.1.12 MB1203A Monitor Section Motherboard
- 9.2 Tower Equipment
- 10 Parts Lists
- 10.1 Introduction
- 10.2 Parts Lists
- 10.3 Usable on code index
- 10.4 Figures
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Figure 8-1 ILS Block Diagram
Each block is described separately in the following sections.
8.2 Transmitter
The transmitter section generates the ILS signal with the required RF power levels and modu-
lations levels. The section comprises two identical transmitters, TX 1 and TX 2, where one is
connected to the antenna, while the other is connected to dummy loads, acting as a back-up.
The reference signals in the transmitter section are RF signals from the oscillator OS1221AB
and LF modulation signals (90Hz and 150Hz) from the low frequency generator LF1223A.
System DC voltages comes from the Power Supply board PS1227A.
In each transmitter, the RF oscillator has separate outputs for Course and Clearance. These
two channels are offset by 10 kHz. The LF Generator also has independent outputs for
Course and Clearance.
The GPA 1231A Glidepath Course Power Amplifier Assembly contains modules to modulate,
amplify and combine signals into the required CSB and SBO signals. Amplitude- and RF
phase feedback ensures correct RF power level and modulation.
The Clearance transmitters GPA1232A generate only CSB signals, and only amplitude feed-
back is therefore incorporated.
The COA 1207A/C Change Over section has relays to connect the CSB and SBO outputs
from one transmitter to the antenna while the other is connected to dummy loads. The relays
are controlled by a Coax-control signal. SBO phase shifters and attenuators are incorporated
for obtaining the correct CSB/SBO relationship.
The block diagram is shown on the next page.
Monitor
Frontend
MF1211/MF1219
Monitor
MO1212
RMS
RMA1215
Monitor
MO1212
TX control
TCA1218
RF oscillator
OS1221
Changeover
Section
Connection
Interface
CI1210
Monitor
input
signals
Monitor
input
signals
LF oscillator
LF1223
Transmitter
LPA/GPA
RF oscillator
OS1221
LF oscillator
LF1223
Transmitter
LPA/GPA
NAV
signals
out
Remote
Control
External
sensors
Comm.
ports
Data and
diagnostics
Monitor
Frontend
MF1211/MF1219
Monitor 1
Monitor 2
Transmitter 1
Transmitter 2
HBK549-1