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NORMARC 7033 Manual

Instrument landing system
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NORMARC 7033
INSTRUMENT LANDING SYSTEM
TRANSMITTER DESCRIPTION
©1999 Navia Aviation AS

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Summary of Contents for NORMARC 7033

  • Page 1 NORMARC 7033 INSTRUMENT LANDING SYSTEM TRANSMITTER DESCRIPTION ©1999 Navia Aviation AS...
  • Page 2 ©1999 Navia Aviation AS...

  • Page 3: Table Of Contents

    NORMARC 7033 TRANSMITTER DESCRIPTION INSTRUMENT LANDING SYSTEM 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........
  • Page 4 OPERATING MANUAL NORMARC 7033 INSTRUMENT LANDING SYSTEM Table of contents ©1999 Navia Aviation AS...
  • Page 5 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.
  • Page 6 TRANSMITTER DESCRIPTION NORMARC 7033 INSTRUMENT LANDING SYSTEM List of Figures ©1999 Navia Aviation AS...
  • Page 7 NORMARC 7033 TRANSMITTER DESCRIPTION INSTRUMENT LANDING SYSTEM LIST OF TABLES Table 3-1 Normal operating power level ............26 ©1999 Navia Aviation AS List of tables...
  • Page 8 TRANSMITTER DESCRIPTION NORMARC 7033 INSTRUMENT LANDING SYSTEM List of tables ©1999 Navia Aviation AS viii...

  • Page 9: Functional Description

    NORMARC 7033 TRANSMITTER DESCRIPTION INSTRUMENT LANDING SYSTEM DESCRIPTION OF NORMARC 2-FREQUENCY TRANSMITTER 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.

  • Page 10: Figure 1-1 System Block Diagram Of A 2-Frequency Gp Transmitter

    TRANSMITTER DESCRIP- NORMARC 7033 INSTRUMENT LANDING SYSTEM POWER AMPLIFIER ASSEMBLY COU-TX1 AMPLITUDE & RF PHASE FEEDBACK COAX CONTROL CHANGE OVER COU AM-MOD. FEEDBACK HYBRID CONTROL 50 ohm MONITOR AM-MOD. COAX RELAY RF OSC. AMPLITUDE & RF PHASE FEEDBACK OUTPUT CSB COURSE...

  • Page 11: Detailed Description

    NORMARC 7033 TRANSMITTER DESCRIPTION INSTRUMENT LANDING SYSTEM Detailed Description Transmitter block diagrams ©1999 Navia Aviation AS DETAILED DESCRIPTION 2-11...

  • Page 12: Figure 2-1 Nm 7033 Transmitter Block Diagram Part 1

    DATA (7:0) LEVEL CONTROL MOD_AMP2 150 Hz CLR PHASE ADJ. 150 Hz LOWPASS AMPLIFIER UNREG 150 Hz 150 Hz CLR FILTER LPF_1502 AGC_AMP4 AC1226B LF1223A Figure 2-1 NM 7033 Transmitter Block Diagram part 1 DETAILED DESCRIPTION ©1999 Navia Aviation AS 2-12...

  • Page 13: Figure 2-2 Nm 7033 Transmitter Block Diagram Part 2

    CSB CLR MODU- LOWPASS PHASE AMPLIFIER DRIVER LATOR FILTER REGULATOR FD1224A PHASE PA1234A FEEDB. OFFSET ADJ. PHASE REGULATOR AMPLIFIER PC1225B HBK 750B-1 PHASE OUT Figure 2-2 NM 7033 Transmitter Block Diagram part 2 ©1999 Navia Aviation AS DETAILED DESCRIPTION 2-13...

  • Page 14: Lf1223A Low Frequency Generator

    TRANSMITTER DESCRIP- NORMARC 7033 INSTRUMENT LANDING SYSTEM LF1223A Low Frequency Generator General Description: LF1223A provides the audio signals to be modulated onto the carrier signal in the transmitter (AC 1226A). The levels of the 90Hz, 150Hz, RF level and ident signals and the morse code of the ident signal are programmable from the RMS.

  • Page 15: Os1221B Rf Oscillator

    NORMARC 7033 TRANSMITTER DESCRIPTION INSTRUMENT LANDING SYSTEM Block diagram: Frequency Divider Counter TST30 CLR90 Ident Sequencer CLR150 COU90 Control COU150 IDNT_DIG IDNT_ON DME_IDNT_IN, DME_ACTIVE DME_IDNT_OUT Control Section EXT_SERVICE IOCSB IOS* RMS interface COAX_POS, LF_ADDR Address *_CS,DAC_A Decoder Refresh Address Sequencer...

  • Page 16: Figure 2-4 Os1221B Block Diagram

    TRANSMITTER DESCRIP- NORMARC 7033 INSTRUMENT LANDING SYSTEM Block Diagram: CHANNEL SELECT COU PROGRAMABLE DIVIDER FREQUENCY MODULUS 2 ADJUST DIVIDER FREQ. TEST MODULUS SELECT POINT X-TAL OSCILLATOR 12 dB BANDPASS LOWPASS OSC_C PHASE FILTER FILTER DETECTOR LOCK DETECT TO IIC BUS WINDOW COMP.

  • Page 17: Gpa1231A Glidepath Course Power Amplifier Assembly

    NORMARC 7033 TRANSMITTER DESCRIPTION INSTRUMENT LANDING SYSTEM 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.

  • Page 18: Figure 2-5 Physical Organization Of Power Amplifier Assembly

    TRANSMITTER DESCRIP- NORMARC 7033 INSTRUMENT LANDING SYSTEM Physical Organization CD 123xx *) AC 1226x PC 1xxxx FD 1xxxx PA 123xx PA 123xx *) *) Not present in GP-CLR HBK695-2 Figure 2-5 Physical organization of power amplifier assembly. DETAILED DESCRIPTION ©1999 Navia Aviation AS...

  • Page 19: Gpa1232A Glidepath Clearance Power Amplifier Assembly

    NORMARC 7033 TRANSMITTER DESCRIPTION INSTRUMENT LANDING SYSTEM General Description: The Glidepath Course Power Amplifier Assembly GPA1231A consists of the following mod- ules mounted together as shown on Fig. 2-5. Power Amplifiers PA1234A Amplitude Control AC1226A Phase Control PC1225B Feedback Detector...

  • Page 20: Pa1234A Power Amplifier

    TRANSMITTER DESCRIP- NORMARC 7033 INSTRUMENT LANDING SYSTEM ules Power Amplifier PA1234A Amplitude Control AC1226B Phase Control PC1225B Feedback Detector FD1224 The GPA1232A contains the RF blocks in the GP Clearance transmitter system. It receives RF signals and LF signals from the OS1221B oscillator and LF1223A low frequency generator respectively.

  • Page 21: Ac1226A Amplitude Control

    NORMARC 7033 TRANSMITTER DESCRIPTION INSTRUMENT LANDING SYSTEM The lowpass filter at the output is a 7th order filter, giving better than 50dB attenuation of all harmonics and forward loss is less than 0.5dB. Filter input and output impedance are 50Ω.
  • Page 22 TRANSMITTER DESCRIP- NORMARC 7033 INSTRUMENT LANDING SYSTEM General Description: The function of FD1236A is to provide feedback signals for amplitude and phase correction of the 90 and 150 Hz modulated RF signals. Two dual directional couplers sample the main RF signal from the 90 Hz and the 150 Hz modulated power amplifiers, respectively.

  • Page 23: Cd1238A Combiner Detector

    NORMARC 7033 TRANSMITTER DESCRIPTION INSTRUMENT LANDING SYSTEM the modulation. When this output is fed back to the power amplifier via the Amplitude Control board, RF power and modulation depth will be held constant, and distortion will be practically eliminated. This detected output voltage is also used for measurement purposes.

  • Page 24: Figure 2-6 Changeover System Block Diagram

    TRANSMITTER DESCRIP- NORMARC 7033 INSTRUMENT LANDING SYSTEM COAX CONTROL MONITOR OUTPUT 50 ohm COAX RELAY COUPLER COAX CONTROL PHASER ATTENUATOR OUTPUT 50 ohm COAX RELAY PHASER ATTENUATOR HBK533-1 Figure 2-6 Changeover system block diagram. DETAILED DESCRIPTION ©1999 Navia Aviation AS...

  • Page 25: Tests And Adjustments

    NORMARC 7033 TRANSMITTER DESCRIPTION INSTRUMENT LANDING SYSTEM Tests and Adjustments Transmitter Alignments and Calibration Test Equipment required: • Oscilloscope general purpose • NM 3710 Field Test Set (with 20 dB attenuator) • BNC Test Cable • Frequency Counter RF Carry out the alignment steps in the order outlined below: 3.1.1...

  • Page 26: Lf Phase Adjustment

    TRANSMITTER DESCRIP- NORMARC 7033 INSTRUMENT LANDING SYSTEM LLZ Course 15W CSB LLZ Clearance 15W CSB GP Course 5W CSB GP Clearance 0,5W CSB Table 3-1 Normal operating power level The output power can be read by means of the RMM Program or the Local Display/Keyboard.

  • Page 27: Rf Power Balance Adjustment

    NORMARC 7033 TRANSMITTER DESCRIPTION INSTRUMENT LANDING SYSTEM A significant indication of correct LF phase is that the pair of the intermediate peaks are equal in amplitude. 3.1.3.2 Two-frequency system Connect oscilloscope channel A to the BNC test connector labelled CSB located on LPA/GPA Course 1 (2).

  • Page 28: Rf Phase At Combiner I/P

    TRANSMITTER DESCRIP- NORMARC 7033 INSTRUMENT LANDING SYSTEM DEMODULATION SBO: 1dB POWER DEMODULATION SBO: NORMAL IMBALANCE (150Hz<90Hz) Figure 3-3 Power balance SBO illustration. Perfect power balance between the 90 Hz modulated carrier and the 150 Hz modulated car- rier is indicated when the two largest sets of peak waveforms fall on lines parallel to the base- line.

  • Page 29: Sdm Calibration

    NORMARC 7033 TRANSMITTER DESCRIPTION INSTRUMENT LANDING SYSTEM 3.1.6 SDM Calibration Connect the NM 3710 Field Test Set to the CSB BNC test connector in the Cabinet's Change- over section. (Insert a 20 dB attenuator at the input of the Field Test Set in order to avoid overloading).

  • Page 30: Rf Frequency Adjustment

    TRANSMITTER DESCRIP- NORMARC 7033 INSTRUMENT LANDING SYSTEM Set the Ident Control to CONTINUOUS from the RMM Program or the Local Display/Key- board. On the Field Test Set, press IDENT. 1020 Hz modulation depth can be adjusted from the RMM Program or the Local Display/Key- board.

  • Page 31: Adjustment Points

    NORMARC 7033 TRANSMITTER DESCRIPTION INSTRUMENT LANDING SYSTEM Adjustment points Figure 3-5 Front side adjustment points. ©1999 Navia Aviation AS TESTS AND ADJUSTMENTS 3-31...

  • Page 32: Figure 3-6 Power Amplifier Assembly Adjustment Points (Rear View)

    TRANSMITTER DESCRIP- NORMARC 7033 INSTRUMENT LANDING SYSTEM RF phase adj. RF.PHASE DC offset adj. RF balance adj. 90Hz mod. adj. Phase feedback offset adj. 150 Hz mod. adj. RF-BAL G90Hz G150Hz PH.OFFS. HBK696-1 Figure 3-6 Power Amplifier Assembly adjustment points (rear view).

  • Page 33: Frequency Configuration Strap Settings

    NORMARC 7033 TRANSMITTER DESCRIPTION INSTRUMENT LANDING SYSTEM Frequency configuration strap settings This section defines the strap settings on the for the standard ICAO Annex 10 ILS frequen- cies. The strap settings for each frequency and equipment type are shown in Table 0-1 and Table 0-2.
  • Page 34 TRANSMITTER DESCRIP- NORMARC 7033 INSTRUMENT LANDING SYSTEM 333.95 X X X X 334.1 X X X X X X 334.25 X X X X X X X 334.4 X X X 334.55 X X X X X X 334.7 334.85 X X X Table 0-1 OS1221B Course frequency settings for 2-freq.
  • Page 35 NORMARC 7033 TRANSMITTER DESCRIPTION INSTRUMENT LANDING SYSTEM 334.1 X X X X X X X 334.25 X X X X 334.4 X X X 334.55 X X X 334.7 334.85 Table 0-2 OS1221B Clearance frequency settings for 2-freq. GP ©1999 Navia Aviation AS...
  • Page 36 TRANSMITTER DESCRIP- NORMARC 7033 INSTRUMENT LANDING SYSTEM TESTS AND ADJUSTMENTS ©1999 Navia Aviation AS 3-36...

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