NORMARC 7033 User manual
©1999 Navia Aviation AS
NORMARC 7033
INSTRUMENT LANDING SYSTEM
TRANSMITTER DESCRIPTION
©1999 Navia Aviation AS
©1999 Navia Aviation AS Table of contents
TRANSMITTER DESCRIPTIONNORMARC 7033
INSTRUMENT LANDING SYSTEM
iii
TABLE OF CONTENTS
1 FUNCTIONAL DESCRIPTION ........................................................................9
2 DETAILED DESCRIPTION..............................................................................11
2.1 Transmitter block diagrams................................................................................11
2.2 LF1223A Low Frequency Generator..................................................................14
2.2.1 NMP110A Low Frequency Generator Control.............................................14
2.3 OS1221B RF Oscillator......................................................................................15
2.4 GPA1231A Glidepath Course Power Amplifier Assembly..................................17
2.4.1 GPA1232A Glidepath Clearance Power Amplifier Assembly......................19
2.4.2 PA1234A Power Amplifier ...........................................................................20
2.4.3 AC1226A Amplitude control.........................................................................21
2.4.4 PC1225B Phase Control..............................................................................21
2.4.5 FD1236A Feedback Detector......................................................................21
2.4.6 CD1238A Combiner Detector......................................................................23
2.5 COA1207C Change-Over Assembly..................................................................23
3 TESTS AND ADJUSTMENTS.........................................................................25
3.1 Transmitter Alignments and Calibration.............................................................25
3.1.1 RF Phase Feedback Adjustment.................................................................25
3.1.2 RF Power.....................................................................................................25
3.1.3 LF Phase Adjustment ..................................................................................26
3.1.4 RF Power Balance Adjustment....................................................................27
3.1.5 RF Phase at Combiner I/P...........................................................................28
3.1.6 SDM Calibration...........................................................................................29
3.1.7 DDM Calibration ..........................................................................................29
3.1.8 Ident Tone Modulation Depth ......................................................................29
3.1.9 RF Frequency Adjustment...........................................................................30
3.2 Antenna System Adjustments............................................................................30
3.3 Adjustment points...............................................................................................31
3.4 Frequency configuration strap settings ..............................................................33
©1999 Navia Aviation AS List of Figures
TRANSMITTER DESCRIPTIONNORMARC 7033
INSTRUMENT LANDING SYSTEM
v
LIST OF FIGURES
Figure 1-1 System Block Diagram of a 2-Frequency GP Transmitter ....................10
Figure 2-1 NM 7033 Transmitter Block Diagram part 1 .........................................12
Figure 2-2 NM 7033 Transmitter Block Diagram part 2 .........................................13
Figure 2-3 NMP110A block diagram. .....................................................................15
Figure 2-4 OS1221B block diagram. .....................................................................16
Figure 2-5 Physical organization of power amplifier assembly. .............................18
Figure 2-6 Changeover system block diagram. .....................................................24
Figure 3-1 LF phase CSB illustration. ....................................................................26
Figure 3-2 LF phase SBO illustration. ....................................................................26
Figure 3-3 Power balance SBO illustration. ...........................................................28
Figure 3-4 RF phase SBO illustration ....................................................................28
Figure 3-5 Front side adjustment points. ...............................................................31
Figure 3-6 Power Amplifier Assembly adjustment points (rear view). ....................32
FUNCTIONAL DESCRIPTION
NORMARC 7033
1-9
INSTRUMENT LANDING SYSTEM
TRANSMITTER DESCRIPTION
©1999 Navia Aviation AS
DESCRIPTION OF NORMARC 2-FREQUENCY TRANSMITTER
1 Functional Description
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. Clearence transmitter is however not included in this single frequency
equipment.
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.
NORMARC 7033
INSTRUMENT LANDING SYSTEM
TRANSMITTER DESCRIP-
FUNCTIONAL DESCRIPTION ©1999 Navia Aviation AS
1-10
Figure 1-1 System Block Diagram of a 2-Frequency GP Transmitter
PHASER ATTENUATOR
PHASER ATTENUATOR
COAX
RELAY
COAX
RELAY
CSB
CSB
SBO
SBO
OUTPUT
SBO COURSE
OUTPUT
CSB COURSE
MONITOR
CSB
COUPLER
COAX CONTROL
COAX CONTROL
COAX
RELAY
OUTPUT
CSB CLEARANC
E
MONITOR
CSB
COUPLER
COAX CONTROL
RF OSC.
TX2
RF OSC.
TX1
LF GEN.
TX1
LF GEN.
TX2
CHANGE
OVER COU
CHANGE
OVER CLR
CSB
CSB
POWER AMPLIFIER ASSEMBLY COU-TX2
POWER AMPLIFIER ASSEMBLY COU-TX1
POWER AMPLIFIER ASSEMBLY CLR-TX1
POWER AMPLIFIER ASSEMBLY CLR-TX2
AMPLITUDE FEEDBACK
AM-MOD. HPA
FEEDBACK
CONTROL
AMPLITUDE FEEDBACK
AM-MOD. HPA
FEEDBACK
CONTROL
AMPLITUDE & RF PHASE FEEDBACK
AM-MOD. HPA
HPA
HYBRID
FEEDBACK
CONTROL
AM-MOD.
AMPLITUDE & RF PHASE FEEDBACK
50 ohm
50 ohm
50 ohm
AMPLITUDE & RF PHASE FEEDBACK
AM-MOD. HPA
HPA
HYBRID
FEEDBACK
CONTROL
AM-MOD.
AMPLITUDE & RF PHASE FEEDBACK
HBK 591-1
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