Manual
Table Of Contents
- 1 General Description
- 1.1 Technical Specifications
- 1.2 General Information
- 2 Physical Organization
- 2.1 Module and Assembly Location
- 2.2 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 Electrical Installation
- 4.1 Connection Overview
- 4.2 Power and Battery
- 4.3 RF Inputs
- 4.4 RF Outputs
- 4.5 DC Loop
- 4.6 Remote Control
- 4.7 PC and Modem
- 4.8 DME
- 4.9 Analog Inputs
- 4.10 Digital Inputs and Outputs
- 4.11 Battery Warning
- 4.12 Remote control connections
- 4.13 Remote slave connection
- 4.14 Interlock switch connection
SYSTEM DESCRIPTION
NORMARC 7033
3-13
©1999 Navia Aviation AS
INSTRUMENT LANDING SYSTEM
GENERAL DESCRIPTION
the station control, the RMS processor, and the voltage regulators.
The change-over section contains coaxial relays, attenuators and phasers for the RF outputs.
The transmitter / PA section contains the PA blocks including couplers etc. for each output.
The cabinet is divided in two parts, with the rear part fixed to a wall, and the front part hinged
to give access to interior of the cabinet.
All external connections are made to the rear part of the cabinet.
3.3 Monitors
The ILS has duplicated monitors with inputs for Course Line (CL), Displacement Sensitivity
(DS), Near Field (NF), and Clearance (CLR) (Dual Freq. only). The signals are detected by
the input stage, and then digitized. In the next block they are filtered by a Fast Fourier Trans-
form performed by a signal processor. The results for each parameter is then compared with
stored limits in a digital hardware comparator.
Each of the two monitors consists of two modules. For Cat III use, Hot Standby monitoring can
be added by using one additional monitor and associated RF couplers and combiners.
The design of the monitors ensures a very high integrity due to the use of digital hardware for
the alarm comparators and a very simple Fast Fourier filtering with a signal processor. In addi-
tion, the monitor is checked by automatic self-tests.
The alarm limits are stored locally in EEPROM, and can be updated from the RMS processor,
with a separate hardware write protection to ensure that the integrity is not affected by the
RMS system.
3.4 Transmitters / Modulators
The transmitters are duplicated, either single frequency or dual frequency. Each transmitter
consists of a RF oscillator, a LF generator, and one or two PA blocks (single or dual fre-
quency).
The RF oscillator uses a synthesizer for easy frequency changes and simple logistics. The
oscillator has two outputs for use in dual frequency systems.
The LF generator contains the generators for 90Hz, 150Hz and 1020Hz signals, the ident
keyer / sequencer and interface for DME master or slave keying. All signals are generated by
division from a common clock oscillator, ensuring very stable phase relations between the
modulation signals.
The modulation balance, modulation sum, RF level and Ident morse code are set in this mod-
ule by means of multiplying digital to analog converters. The values are stored locally in
EPROM and can be updated from the RMS processor with hardware write protection.
The same LF generator is used for single and dual frequency systems.
3.5 TX Control
The TX control unit controls the system dependent on alarms from the monitors and inputs