1150 DVOR Overheads Selex Rev -TR

OPERATION AND MAINTENANCE TRAINING COURSE

DOPPLER VHF OMNIDIRECTIONAL RANGE BEACON (DVOR) SELEX Sistemi Integrati Inc. 11300 West 89th Street Overland Park, KS 66214 USA T: 1-913-495-2600

This document contains proprietary information and such information may not be disclosed to others for any purpose nor used for manufacturing purposes without written permission from SELEX Sistemi Integrati Inc

1

Rev -, December 28, 2007

COURSE OBJECTIVES • Name and locate each major assembly of the 1150 DVOR Equipment, explain the function of each, and explain its contribution to the overall signal flow. • Operate and align the DVOR equipment in accordance with the manufacturer’s specifications. • Recognize out of tolerance conditions and troubleshoot the DVOR equipment to the module, subassembly or Line Replaceable Unit (LRU) level. • Verify and perform hardware and software configuration procedures. • Upgrade operating software of the 1150 DVOR equipment. • Perform ground check procedures and provide ground support for flight checks.


2


LECTURE

MODEL 1150 DVOR IN CONTEXT OF GENERAL DVOR THEORY


3


OBJECTIVES OF MODEL 1150 DVOR IN CONTEXT OF GENERAL DVOR THEORY

• RF spectrum as seen by the aircraft • The phase relationship of the AM and FM components • How Model 1150 Doppler VOR produces each component • The characteristics of the CSB output from the transmitter • The characteristics of each sideband output from the transmitter


4


TYPICAL INSTALLATION OF DVOR STATION

Ring of 48 Sideband Antennas

The Counterpoise is used for clean reflection of RF pattern

Carrier Antenna in the center of the ring

The Transmitter is located in the shelter


5


TYPICAL ON-BOARD INDICATORS The “bug” turns the bearing ring to select the direction the pilot wants to be traveling when he arrives at the VOR. In this case the pilot wants to fly North toward the VOR from the South. He would be on radial 180.

VOR ONLY

If he is directly south of the VOR, then the needle is centered. Bearing ring

A flag shows that he is flying north “To” the VOR. (The “From” flag would not be visible in this case.)

“bug”


After he passes over the VOR, the “To” flag disappears and the “From” flag appears.

6


TYPICAL ON-BOARD INDICATORS

VOR AND ILS A VOR Deviation Indicator can be combined with an ILS indicator. When the Localizer is selected, then the vertical needle shows Localizer information instead of VOR information.


7


COMPARING THE TWO 30 Hz SIGNALS AT DIFFERENT AZIMUTHS

AM FM

NORTH

EAST

SOUTH

WEST

0 DEG AM AND FM SIGNALS ARE IN PHASE

90 DEG

180 DEG

270 DEG

RADIAL

RADIAL

RADIAL

AM LAGS FM BY 90 DEG




8


Example

AM FM

NORTH W E S T

VOR

AM

AM

FM FM

AM

FM

SOUTH This document contains proprietary information and such information may not be disclosed to others for any purpose nor used for manufacturing purposes without written permission from SELEX Sistemi Integrati Inc

9


E A S T

COMPOSITE VOR SIGNAL

30 HZ COMPONENT

10440

9960

9960 HZ COMPONENT

9960

9960

9480

THE 9960 COMPONENT VARIES ITS FREQUENCY THROUGHOUT ITS CYCLE


10


SOURCE OF THE AM COMPONENT

RF MODULATED BY 30 Hz AUDIO

30 Hz AUDIO FROM DETECTED RF


11


SOURCE OF 30 HZ FM SIGNAL

9960 Hz AUDIO WITH 30 Hz FREQUENCY MODULATION

30 Hz AUDIO FROM DISCRIMINATED 9960 AUDIO


12


VOR SIGNAL FROM PILOT’S POINT OF VIEW (ON SPECTRUM ANALYZER)


13


ROTATION OF SIDEBAND ANTENNAS

USB 3

2

1

25 26 27

LSB This document contains proprietary information and such information may not be disclosed to others for any purpose nor used for manufacturing purposes without written permission from SELEX Sistemi Integrati Inc

14


A portion of the 9960Hz signal is formed by mixing the Carrier with the USB in space.

If the sideband antenna were stationary, then the 9960 Hz signal would not vary in frequency.

USB

As the sideband antenna rotates, it approaches or departs the receiver at high velocity.


15


The Doppler Effect causes the 9960 Hz to deviate above and below its center frequency.

The Lower Sideband adds amplitude to the 9960 Hz signal.

USB

LSB This document contains proprietary information and such information may not be disclosed to others for any purpose nor used for manufacturing purposes without written permission from SELEX Sistemi Integrati Inc

16


BLENDING OF TWO LOWER SIDEBAND SIGNALS IN ADJACENT ANTENNAS

1

3

SIDEBAND 1 (SB3)

ODD ANT

48

4

2

SIDEBAND 2 (SB4)

EVEN ANT

SUM IN SPACE


17


FIVE RF OUTPUTS FROM THE TRANSMITTER CABINET

1. CSB – RF at FC, amplitude modulated by 30 Hz + 1020 Hz + VOICE 2. SIDEBAND 1 – RF at FC-9960Hz, amplitude modulated by rectified sine wave 3. SIDEBAND 2 – RF at FC-9960Hz, amplitude modulated by rectified cosine wave 4. SIDEBAND 3 – RF at FC+9960Hz, amplitude modulated by rectified sine wave 5. SIDEBAND 4 – RF at FC+9960Hz, amplitude modulated by rectified cosine wave


18


LECTURE

ALFORD LOOP ANTENNA


19


OBJECTIVES OF ALFORD LOOP ANTENNA LECTURE

• The physical makeup of the Alford Loop antennas (Carrier and Sideband) • The basic propagation theory of the Alford Loop antenna • Tuning points of the Alford Loop antenna


20


TOP VIEW OF CARRIER ANTENNA

Hole for DME antenna mast


21


TOP VIEW OF SIDEBAND ANTENNA


22


IMPEDANCE MATCHING NETWORK


23


PHYSICAL MAKEUP OF THE ALFOR LOOP ANTENNA

THE ALFORD LOOP IS TWO ORTHAGONAL FOLDED DIPOLES. ONE DIPOLE IS HIGHLIGHTED HERE.


24


PHYSICAL MAKEUP OF THE ALFOR LOOP ANTENNA

THE OTHER DIPOLE IS HIGHLIGHTED HERE.


25


REMAINING CURRENTS WITH INTERNAL CURRENTS CANCELLED

CONSIDER A MOMENT IN TIME. CURRENT FLOWS IN THE PICTURED DIRECTIONS. ASSUMES 180 DEGREES OF PHASE DIFFERENCE BETWEEN THE TWO FOLDED DIPOLES.

THE INTERNAL CURRENTS PRODUCE FIELDS OF OPPOSITE AND EQUAL FIELD STRENGTH. THEY CANCEL OUT EACH OTHER, LEAVING ONLY THE FIELDS GENERATED BY THE EXTERNAL ANTENNA SURFACES

THE RESULTING RF PATTERN IS OMNIDIRECTIONAL This document contains proprietary information and such information may not be disclosed to others for any purpose nor used for manufacturing purposes without written permission from SELEX Sistemi Integrati Inc

26


LECTURE

TRANSMITTER CABINET BLOCK DIAGRAM


27


OBJECTIVES OF TRANSMITTER CABINET BLOCK DIAGRAM LECTURE

• The main physical components of the 1150 DVOR Transmitter Cabinet • The primary function of each module • The flow of RF, Audio, and Control signals


28


MAIN COMPONENTS OF TRANSMITTER CABINET

TRANSMITTER 1

RMS

TRANSMITTER 2


29


MONITORING

CSB GENERATOR

AUDIO GENERATOR SIDEBAND GENERATION

RMS POWER SUPPLIES


30


CSB GENERATION Synthesizer produces CW RF

Modulated Carrier (CSB) to the antenna

Audio Generator adds Audio LPF eliminates harmonics Directional Coupler provides samples for Power and VSWR measurements RF Monitor detects samples and provides audio to the Audio Generator for measurement


31


Sideband 1 SBO: CW RF at LSB frequency, modulated 100% by rectified 360 Hz sine wave

360 Sine wave + Sine bi-phase = Rectified sine wave, which is applied to CW RF to produce SBO


32


Sideband 2 SBO: CW RF at LSB frequency, modulated 100% by rectified 360 Hz cosine wave

360 Cosine wave + Cosine bi-phase = Rectified Cosine wave, which is applied to CW RF to produce SBO


33


Sideband 3 SBO: CW RF at USB frequency, modulated 100% by rectified 360 Hz sine wave

360 Sine wave + Sine bi-phase = Rectified sine wave, which is applied to CW RF to produce SBO


34


Sideband 4 SBO: CW RF at USB frequency, modulated 100% by rectified 360 Hz cosine wave

360 Cosine wave + Cosine bi-phase = Rectified cosine wave, which is applied to CW RF to produce SBO


35


Power Supplies

BCPS 1 powers Transmitter 1

43 Vdc for Power Amplifier Increases to 48 Vdc if modulation is above 43%. 28 Vdc for remaining circuits.

Both BCPSes manage the charge on the single set of batteries.


36

A second set of batteries may be connected in parallel.


Radiated RF is received by the Yagi antenna

The RF is applied to two detectors Detected RF (audio) is applied to the monitors


37


Detected RF (audio) from the dummy load Standby signal is analyzed by both monitors.


Standby monitoring is only for power levels of CSB and SBO.

38


Identification Synchronization to the DME


39


LECTURE

PMDT OPERATION


40


Objectives of PMDT Operation Lecture

• • • •

How to obtain access to the PMDT software The general layout of the PMDT screen The use of Print and Copy icons Memory management


41


SEC3 THREE

Double-click PMDT icon


Log in with default username and password

42


Four levels of security: • Level 1, only view data • Level 2, only basic controls (On, Off, Transfer, Reset) • Level 3, full control and configuration • Level 4, same as level 3 but adds capability to create usernames and manage other users’ passwords


43


Sidebar – always visible if logged in.

Info and controls of the Sidebar: • • •

• • •


Whether there is a maintenance alert Whether in local mode (must be in local mode to make changes) Status and connection of each transmitter. These buttons allow for control. Status of each monitor. Bypass control. Measurements of the integral monitored parameters. Status of DMEs (not configured on this screen shot)

44


Copy data from this page to the clipboard. The data can be pasted to other programs (Word Pad, Word, Excel, email, etc.)

Print data from this page to a printer connected to this PC.


45


PMDT Overview

Memory Management

Printer connected to the PMDT Laptop

PMDT PC

PC storage device

Transmitter Cabinet System, Configuration, Save

System, Configuration, Load

System, Print

Active RAM – These values are the ones actually used by the DME RESET (F8)

RMS, Config_Backup

RMS, Config_Restore

APPLY (F7)

Screen RAM – These values are the ones displayed on the screen


46


Nonvolatile Backup Memory

Refer to the manual or PMDT software, and examine the following screens: •RMS •Status and Data – Shows condition and measurements of various parameters. These DO NOT include the monitored parameters. •Configuration – Allows the maintenance personnel to select the appropriate operational settings. •A/D Limits defines the “Pre-alarm” limits for the power supplies •Logs – maintains a record of various events. Each tab keeps about 100 records, and rotates the oldest ones off as new ones occur. •Commands – refer to the manual for the definition. •DME Commands refers to a co-located DME; this function gives DME remote control even if the DME has no RMM connection.


47


•TRANSMITTERS •Data – Shows measurements of various RF parameters. •Configuration •Nominal – Defines the values desired •Offsets and Scale Factors – to calibrate the specific transmitter to produce the Nominal values. •Commands •Ident commands allow the user to force or remove ident for test purposes


48


•Monitors •Data: analysis of signal received by monitor antenna •Integrity – Shows the values and limits of the monitored parameters •Ground Check – Allows technician to run an automatic or semiautomatic ground check, and displays the results. •Certification Test Results and Test Data – Allows the technician to run the listed test, and displays the results. •Standby – displays some of the Transmitters Data fields for the transmitter connected to the dummy load. •Offsets and Scale Factors •Test Generator/Certification – calibrates the Monitor CCA itself •Field Detector – adjusts for errors in the detected signal


49


•Diagnostics •Power-up results – shows the results of the digital circuitry test performed at the time of power up. •Fault Isolation – Auto diagnostic software.


50


LECTURE

HARDWARE CONFIGURATION


51


Pressing this button causes a window to appear with the proper dip switch settings to select the frequency in the window.


52


Dip switch settings for frequency selection


53


Audio Generator CCA Hardware configuration • • •

• •

E1 – to enable the watchdog, jumper 1-2 There is no E2 E3 –Jumper 3-4 to disable DVOR ground check. Jumper 1-2 to enable DVOR ground check. E4 – For DVOR application, jumper 3-4 E5 – For DVOR application, jumper 3-4.

Instructor will point out the jumpers at this time.

Serial Interface Hardware configuration •

Switch S1 • Switches 1, 3, 5, and 8 are set to the ON position • Switches 2, 4, 6, and 7 are set to the OFF position


54


Monitor CCA Hardware configuration • Do NOT jumper E1 to E2. Used only during design. • Do NOT jumper E3 to E4. Used only during Depot maintenance. • E5, E6 and E7 are calibration jumpers set in factory. Do not change them. Instructor will point out the jumpers at this time.

1A9 Modem CCA Hardware configuration • •

JP1 set to INT1 position JP2 is set up during installation, depending on which dialup modem is used, the internal one, or an external one. Instructor will point out the jumpers at this time.

Software Re-Installation procedures Instructor will demonstrate the removal and replacement of software chips on a module.


55


LECTURE

CSB TRANSMITTER


56


Objectives of CSB Transmitter Lecture

• The inputs and outputs of the Frequency Synthesizer and CSB Power Amp • Physical setting and alignment procedures for the Frequency Generator and CSB Power Amp • Test Points of Frequency Synthesizer and CSB Power Amp • Jumper configurations of Frequency Synthesizer and CSB Power Amp • Signal generation and flow of the CSB


57



58


Table 3-9. Synthesizer CCA (1A4, 1A20) Controls and Indicators TP1

Lower Sideband Quadrature Signal. When Sidebands 1 and 2 (1A4, 1A21) are in phase and equal amplitude this signal is a triangular waveform.

TP2

Upper Sideband Quadrature Signal. When Sidebands 3 and 4 (1A5, 1A22) are in phase and equal amplitude this signal is a triangular waveform.

TP3

Carrier Phase Error Voltage (0V için R81 ile ayarla)

TP4

Carrier Phase Control Voltage (2 – 9 V arası)

TP5

DVOR Sideband Manual Phase Control Voltage

TP6

This test point is available for scope or voltmeter ground

Carrier sample for test purposes


59


Overtemp (70 C) protection – thermistor mounted on Q5, Q6

When the percent modulation is programmed to be more than 43%, supply voltage is increased to 48V

Percent modulation stabilization

Built-in power out stability and VSWR protection. In addition, there is VSWR protection by the Audio Generator using the forward and reverse power feedback from the RF Monitor This document contains proprietary information and such information may not be disclosed to others for any purpose nor used for manufacturing purposes without written permission from SELEX Sistemi Integrati Inc

60


Low-Pass Filter Assembly and Directional Coupler

The LPA Filters out harmonics

Feedback for phase and frequency lock

Reflected port to measure VSWR Forward port to measure transmitted power Carrier sample for test point


61


LECTURE

AUDIO GENERATOR


62


Objectives of Audio Generator Lecture

• The inputs and outputs of the Audio Generator


63


Composite output of the Audio Generator

Components of the Composite Audio signal: •30 Hz (30 %) •Ident (6%) during the time ident is being sent •Voice (5%) if selected and there is an input •DC component that is proportional to the carrier power


64


Sideband audio outputs of the Audio Generator

•Sine wave @ 360 Hz •This sine wave will be rectified in the SB Generator, so there will be 720 “humps” per second. •Sideband 1 and Sideband 2 are 90 degrees (of the 360 Hz signal) out of phase, so the “humps” are 180 degrees out of phase


65


Sideband biphase outputs of the Audio Generator

•Square wave •Each time the sideband signal reaches zero, the bi-phase changes state •The bi-phase is used in the Sideband Generator to rectify the 360 Hz sine wave.


66


Sideband phasor outputs of the Audio Generator

SB2/4 phase is fixed – it cannot be changed Sideband Phase DC levels – DC voltage set by the operator in PMDT, to adjust the phase of the sidebands to each other (SB1 to SB2, and SB3 to SB4).


67


Commutator switching outputs of the Audio Generator

Switching bus to commutator – creates the 30Hz FM sine wave


68


Audio Generator serial communication to RMS

DC and audio levels from the RF Monitor.

Data to RMS for use in PMDT – measurements of audio and dc analog voltages from the RF Monitor.

Voice from automated system (ATIS) or microphone


69


LECTURE

SIDEBAND GENERATION


70


Objectives of Sideband Generation Lecture

• The inputs and outputs of the Sideband Generator • Field alignment procedures for the Sideband Generator • Function of the Isolators


71


Sideband 1 720 “humps”/sec

CW RF @ Carrier freq Minus 10 KHz


72


Sideband 2

CW RF @ Carrier freq Minus 10 KHz

720 “humps”/sec


73


Sideband 1 (or 3)

Sideband 2 (or 4)


74


Sideband Generator Test Points

Table 3-10. Sideband Generator (1A5, 1A6, 1A21, 1A22) Controls and Indicators

TP1

This test point is the Sideband 1 (1A5,1A21) or Sideband 3 (1A6,1A22) Dynamic Phase Control Voltage.

TP2

This test point is the Sideband 1 (1A5,1A21) or Sideband 3 (1A6,1A22) Sideband Manual Phase Control Voltage. This is a DC voltage representing the phaser control voltage.

TP3

This test point is the Sideband 1 (1A5,1A21) or Sideband 3 (1A6,1A22) Mean Phase Control Voltage. This is a DC voltage representing the mean (slow) phaser control voltage.

TP4

This test point is the Sideband 1 (1A5,1A21) or Sideband 3 (1A6,1A22 Mean Phase Error Voltage. This is a DC voltage representing the mean (slow) error control voltage. If the control loop is locked this voltage should be nearly 0 volts.

TP5

This test point is the detected output of the Sideband 1 (1A5, 1A21) or Sideband 3 (1A6, 1A22) output. This signal is a rectified 360 Hz waveform in DVOR mode.


75


Sideband Generator Test Points

Table 3-10. Sideband Generator (1A5, 1A6, 1A21, 1A22) Controls and Indicators TP6

This test point is the detected output of the Sideband 2 (1A5, 1A21) or Sideband 4 (1A6, 1A22) output. This signal is a rectified 360 Hz waveform in DVOR mode.

TP7

This test point is the Sideband 2 (1A5,1A21) or Sideband 4 (1A6,1A22 Mean Phase Error Voltage. This is a DC voltage representing the mean (slow) error control voltage. If the control loop is locked this voltage should be nearly 0 volts.

TP8

This test point is the Sideband 2 (1A5,1A21) or Sideband 4 (1A6,1A22 Mean Phase Control Voltage. This is a DC voltage representing the mean (slow) phaser control voltage.

TP9

This test point is the Sideband 2 (1A5,1A21) or Sideband 4 (1A6,1A22 Sideband Manual Phase Control Voltage. This is a DC voltage representing the phaser control voltage.

TP10

This test point is the Sideband 2 (1A5,1A21) or Sideband 4 (1A6,1A22) Dynamic Phase Control Voltage.


76


Sideband Generator Test Point 1/10

TP1 (TP10) Smooth transition

No noise on the rounded part (no spurious oscillations)


77


Sideband Frequency and Phase lock


78


Commutator


79


Isolators

Isolators are used to redirect reflected energy to a detector circuit to monitor VSWR of sideband antennas


80


LECTURE

PHASING CONSIDERATIONS


81


Consider the electrical length of each path SYNTH XTAL

PLL

LPF, DIR CPLR, RELAY

POWER AMP

PLL PLL

SIDEBAND GENERATOR

All the RF signals originate from this point.

COMMUTATOR

PHASER

SIDEBAND GENERATOR PHASER

The CSB signal follows this path


82


Sideband 1 follows this path SYNTH XTAL

PLL

POWER AMP


PLL PLL

SIDEBAND GENERATOR

COMMUTATOR

PHASER



83



PLL

POWER AMP


PLL PLL

SIDEBAND GENERATOR

COMMUTATOR

PHASER



84



PLL

POWER AMP


PLL PLL

SIDEBAND GENERATOR

COMMUTATOR

PHASER



85



PLL

POWER AMP


PLL PLL

SIDEBAND GENERATOR

COMMUTATOR

PHASER



86


All five signals must have the same phase in space SYNTH XTAL

PLL

POWER AMP


PLL PLL

SIDEBAND GENERATOR

COMMUTATOR

PHASER



87


Sidebands 1 and 2 are the same frequency SYNTH XTAL

PLL

POWER AMP


PLL PLL

SIDEBAND GENERATOR

COMMUTATOR

PHASER


Using the PMDT, it is possible to adjust the phase of Sideband 1 to make it equal to Sideband 2. This document contains proprietary information and such information may not be disclosed to others for any purpose nor used for manufacturing purposes without written permission from SELEX Sistemi Integrati Inc

88


Sidebands 3 and 4 are the same frequency SYNTH XTAL

PLL

POWER AMP


PLL PLL

SIDEBAND GENERATOR

COMMUTATOR

PHASER


Using the PMDT, it is possible to adjust the phase of Sideband 3 to make it equal to Sideband 4. This document contains proprietary information and such information may not be disclosed to others for any purpose nor used for manufacturing purposes without written permission from SELEX Sistemi Integrati Inc

89


It is not possible to equalize the phases of two different frequencies. But, consider the Carrier and LSB frequencies.

Their mix in space creates a beat frequency (9960 Hz). This provides half the modulation.

The phase of the beat frequency depends on the relative phase of the two original signals (Carrier and LSB).


90


Now, consider the Carrier and USB frequencies.

Their mix in space also creates a beat frequency (9960 Hz). This provides the other half of the modulation The phase of this beat frequency also depends on the relative phase of the two original signals (Carrier and USB).


91


If the phase of the two modulations are the same, then they mix well in space, causing a maximum effect on the carrier (maximum 9960 Hz modulation).

If the phase of the two modulations are not the same, then they don’t mix well in space, causing less than optimum effect on the carrier (low 9960 Hz modulation).


92


If the phase of the carrier is adjusted, it has the opposite effect on the two beat signals.

Movement of carrier phase both advances one beat signal, and retards the other.

When the 9960 Hz modulation is at its maximum, the Carrier to Sideband Phase is at its optimum value.


93


LECTURE

RF MONITOR


94


Objectives of RF Monitor Lecture

• The Inputs and Outputs of the RF Monitor • The Test Points of the RF Monitor and their meaning • Adjustment Points of the RF Monitor


95


RF Monitor inputs and outputs

Each output is audio, directed to Audio Generator

Each of these inputs is RF

Each audio output is also seen on the test points.

TX 1 Forward power TX 1 Reflected power

SB1 Reflected power SB2 Reflected power SB3 Reflected power SB4 Reflected power

Sideband forward powers are not detected in the RF Monitor

The RF Monitor contains the Dummy Load for the Standby Transmitter This document contains proprietary information and such information may not be disclosed to others for any purpose nor used for manufacturing purposes without written permission from SELEX Sistemi Integrati Inc

96


RF Monitor adjustments

Adjustments Tüm ayarlar ile, harici wattmetrede okunan değerlere göre PMDT ayarlanır. All the adjustments are to calibrate the PMDT reading to match an external wattmeter. TX 1 and 2 Forward and Reflected Sidebands 1, 2, 3, and 4 Reflected Note: Sideband forward power PMDT reading is calibrated using R100 on each Sideband Generator


97


LECTURE

MONITORS


98


Objectives of Monitors Lecture

• The Inputs and Outputs of the Monitor • The fundamental principle of how the composite signals are analyzed


99


Monitor Antenna

Dipole antenna located on any radial, at about 300 feet from the center of the counterpoise.


100


Detector 1 Test Generator Detector 2

Standby Composite


101


Monitor CCA Simplified Block Diagram 30Hz Filter

Peak Detector

Zero Crossing Detector 9960 Hz Filter

Peak Detector

% Mod 30Hz AM

Square Wave 30Hz AM freq, Azimuth % Mod 9960Hz AM

Field Det 1 Field Det 2 Test Gen

MUX

Composite (TP5)

Zero Crossing Detector

FM Discriminator

Square Wave 9960Hz freq

Peak Detector

Zero Crossing Detector DC Level Detector

300 – 3KHz Filter

1020 Notch FL

RF Level


Peak Detector

1020Hz Filter

% Mod Ident Freq Ident

102


Dev. Ratio FM

Square Wave 30Hz FM freq, Azimuth

% Mod Voice

LECTURE

FIELD DETECTOR


103


Field Detector Lecture

Detects RF from the field monitor antenna, converts to audio for analysis by the monitors.


104


LECTURE

REMOTE MAINTENANCE SYSTEM (RMS)


105


CPU CCA Lecture

• The main function of the CPU CCA • The purpose of the Lithium battery Gathers data for interaction with PMDT and RCSU software. Communicates with other RMS modules through the backplane. The EEPROM is actually a battery-operated RAM. • Retains its memory as long as the battery is good. • Battery is designed to stay good for 100 years, as long as power remains constantly on. • It takes more than a month of no power to drain the battery • If the CPU CCA is removed from the cabinet, remove the battery jumper to conserve charge.


106


Facilities CCA

• Allows CPU μP to send and receive info to/from various discrete and analog lines.


107


Facilities CCA Inputs and Outputs 1 3 5 7 9 11 13 15 17 19 21

M48V M28V M12V M5V M-12V GENLVL MBCRET SBCRET MTXRET STXRET MBCOT

2 4 6 8 10 12 14 16 18 20 22

S48V S28V S12V S5V S-12V SPARE1 BARO RET WIND RET TX OUT (OUT) TACH MBCUPS

Sys. B BCPS 48 Vdc Sys. B BCPS 28 Vdc Sys. B LVPS 12 Vdc Sys. B LVPS 5 Vdc Sys. B LVPS -12 Vdc Spare 1 (future use) Barometer Sensor Return Wind Sensor Return Antenna Status to RSCU Tachometer Sys. A BCPS UPS Status

24

MBCPF

Sys. A BCPS Power Fail Status

26

SBCUPS

Sys. B BCPS UPS Status

28

SBCPF

Sys. B BCPS Power Fail Status

30 32 34 36

MNORM SALM SBYP SBCCD

38

#2 ON

Monitor 1 Normal Monitor 2 Alarm Monitor 2 Bypass Sys. B BCPS Charger Disconnect (ON/OFF) Turn-on Sys. B Signal from RSCU Control Interface CCA

40

TX IND (IN)

On-Air Transmitter Indicator Status from Relay 1K1

42 44

Spare 7 SPARE2

Spare 7 (future use) Spare 2 (future use)

SPARE3 SPARE 5

Sys. A BCPS 48 Vdc Sys. A BCPS 28 Vdc Sys. A LVPS 12 Vdc Sys. A LVPS 5 Vdc Sys. A LVPS -12 Vdc Test Generator Level Sys. A BCPS Return (N/C) Sys. B BCPS Return (N/C) Sys. A Transmitter Return Sys. B Transmitter Return Sys. A BCPS Overtemp Status Sys. A BCPS Battery Low Status Sys. B BCPS Overtemp Status Sys. B BCPS Battery Low Status Monitor 1 Alarm Monitor 1 Bypass Monitor 2 Normal Sys. A BCPS Charger Disconnect (ON/OFF) Turn-on Sys. A Signal from RSCU Control Interface CCA Turn-off On-Air System Signal from RSCU Control Interface CCA Spare 8 (future use) Transfer Status to RSCU Control Interface CCA Spare 3 (future use) Spare 5 (future use)

23

MBCBL

25

SBCOT

27

SBCBL

29 31 33 35

MALM MBYP SNORM MBCCD

37

#1 ON

39

OFF

41 43

SPARE 8 TRANSFER

45 47

46 48

Spare 4 (future use) INTO Signal from CPU CCA

SPARE 6

Spare 6 (future use)

50

SPARE4 TIME INTERVAL FAN2

49


108

(Disabled)


Serial Interface CCA

Summary – Allows CPU μP to communicate with devices that require serial communication. •Audio Generator(s) •Monitors •DME(s) •PMDT •External Modem (if used, not required)


109


Test Generator CCA

Provides a composite audio signal to apply to the monitors for testing/certification.

It takes several minutes for a signal to form once it is configured.


110


Modem CCA

Two modems on this module: 1. Dedicated line for RCSU 2. Dialup modem for remote PMDT connection


111


Optional RSCU Interface

Allows interface between VOR and obsolete 1138 RSCU.


112


Low Voltage Power Supplies

1A15 supplies Transmitter 1

1A16 supplies Transmitter 2

1A14 supplies the RMS


113


Commutator CCAs

SB2

SB1

3

1

4

47

45 43 41 39 37 35 33 31 29 27 25

5

7 9 11 13 15 17 19 21 23

48

46 44 42 40 38 36 34 32 30 28 26

6

8 10 12 14 16 18 20 22 24

SB4

SB3


2

114


Procedures not covered during labs

•6.4.3 Cabinet Backplane Connector Adjustment. Use if a replacement module in the RMS does not quite fit into the slot. •6.4.4 Replacing CPU (1A13) CCA. Use this procedure when replacing a CPU CCA. It outlines the procedures for loading the alignment and configuration data into the new CPU. •6.4.5 Update of DVOR Software. This should not be attempted except at the instruction of the factory. New software may not be compatible with old hardware. •6.4.8 Changing the CPU CCA (1A13) Lithium Battery. If the battery fails during Annual Preventive Maintenance (or at any other time), follow this procedure to replace it. This will keep the data intact. •9.7.1 Strapping Battery Charger Power Subsystem (BCPS) for 240 VAC. Use this procedure any time the BCPS is replaced. •9.7.4 Checking the Battery Charger Power Subsystem for 43 or 48 Volts. Use this procedure any time the Main Voltage needs to be checked. Especially check it after the BCPS is replaced, or after a commercial power surge.


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LECTURE

FLIGHT CHECK


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Objectives of Flight Check Lecture

• How to provide ground support for a flight check

What to expect: Prior to arrival, set the DVOR (and associated DME) with antenna to transmitter 1. On arrival, a flight crew normally begins a commissioning FC with an orbit. After the orbit, you can expect to hear the following results.


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Preparation for Flight Check • Calibrate Transmitters 1 and 2 to produce the value of CSB defined on the Nominal screen, measured with external wattmeter • Calibrate the Sideband Generators so that all eight sidebands have the same power output, measured with external wattmeter • Calibrate the PMDT wattmeter readings • Perform all phasing adjustments (SB1-SB2, SB3-SB4, CSB to Sideband) • Perform the full checkout procedure, paragraph 6.2 of the manual • Adjust the transmitter values to produce ideal monitor values on the PMDT


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Transmitters, Configuration, Nominal

For one, the flight crew will announce the Station Error, or Offset. Adjust for Station Error by putting the number given by the Flight Check crew in the Azimuth Index field. If using that number increases the error, then change the sign of the index.

You will also be told the Spread.


The maximum spread during Flight Check is 4 degrees. There is no corrective action to reduce spread which can be performed during the flight check. All the causes are due to siting.

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You will be told the percent modulation of the 9960 Hz signal.


Adjust the 9960 Hz percent modulation by increasing or decreasing the SBO RF level.

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Transmitters, Configuration, Offsets and Scale Factors

You will be told the percent modulation of the 30 Hz signal.


Adjust the 30 Hz percent modulation by increasing or decreasing the Scale factor for Transmitter 1.

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Once the flight crew has completed a test with Transmitter 1 on antenna, they will ask you to transfer the antenna to Transmitter 2. You will transfer back and forth several times during the Flight Check.

DO NOT adjust any Nominal values when Transmitter 2 is on the antenna.


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If the pre-flight inspection alignment was performed well, then there should be no need to adjust Transmitter 2.

However, if an adjustment is needed, make all adjustments for Transmitter 2 on Transmitters, Configuration, Offsets and Scale Factors screen.


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Once the flight check is complete, and has passed, DO NOT ADJUST ANY MORE TRANSMITTER PARAMETERS. However, it is necessary to adjust the monitor parameters on the Field Detector column. Azimuth Angle Offset to correct Azimuth Angle.


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Monitors, Configuration, Offsets and Scale Factors 30 Hz Modulation to correct 30 Hz Modulation

9960 Hz Modulation to correct 9960 Hz Modulation

Once the Flight Check has passed, and the monitors are reading ideal values, then maintenance is complete. Put the controls in normal, clean up, lock up, and have some Scooby snacks. End of Slide Presentation. This document contains proprietary information and such information may not be disclosed to others for any purpose nor used for manufacturing purposes without written permission from SELEX Sistemi Integrati Inc

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1150 DVOR Overheads Selex Rev -TR

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