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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COUNT = FRQ / 7.5011KHZ
In order to set the frequency on the OS1221, the count must be rounded off to the nearest
integer value and converted to a binary number.
Insert shunts for binary zeros on the pin arrays P2 or P102 (COU/CLR) starting with the most
significant bit on P2/102,A0 and the least significant bit on P2/102,N9. Be aware that most cal-
culators discards leading zeros. Please find tables of jumper settings in Operating Manual
Appendix B.
The internal oscillator of the Course PLL is also used to control the Clearance PLL.
The differential output of the phase comparator is made single ended by a balanced amplifier.
A combined low-pass filter and integrator is built around an operational amplifier, that gener-
ates the control voltage for the RF oscillator. This control voltage is also fed to a window com-
parator that alarms the system via the I
2
C-bus if it falls outside its limits (another control of the
PLL is via the Lock Detect output of the PLL). The Lock Detect output of the PLL circuit is fed
to a low pass filter and a transistor. This output consists of narrow negative going pulses when
the loop is locked, and wide pulses of variable width when out of lock. Therefore the transistor
will be turned off when in lock, and on when out of lock.
The output from the transistor goes to two Schmidt triggers, one latching and one unlatching.
The latching Schmidt triggers turns the signal off if the loop goes out of lock and alarms the
I
2
C-bus. It is reset by power on and/or a low transition of the COU_OFF signal (CLR_OFF for
the clearance channel). The other Schmidt trigger is used to inform the system of the situation
that the loop have been out of lock, but is in lock at the present time even if the signal is turned
off (this might be the situation if a short drop in the 12V supply occurs, or a change in fre-
quency setting has taken place).
The signal switching is done in two steps. The first is a diode switch and the next is a Dual
Gate Mosfet transistor that can be turned off by taking its control gate to a low potential. This
transistor acts as a buffer for the signal when in the on state. At the output of this transistor, a
second order bandpassfilter follows, that serves as an output match of the transistor and to fil-
ter out harmonics of the output voltage. The last stage is a 12dB gain block that delivers
10mW of power to the PC1225 card.
The Clearance channel is identical to the Course channel ecsept for the crystal oscillator for
the PLL.
9.1.6 GPA1231A Glidepath Course Power Amplifier Assembly
General Description:
The Glidepath Course Power Amplifier Assembly GPA1231A consists of the following mod-
ules mounted together as shown on Fig. 9-7.
2 Power Amplifiers PA1234A
1 Amplitude Control AC1226A
1 Phase Control PC1225B
1 Feedback Detector FD1236A
1 Combiner Detector CD1238A