1150 dvor overheads selex rev -tr

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

OPERATION AND MAINTENANCE TRAINING COURSE

DOPPLER VHF OMNIDIRECTIONAL RANGE

BEACON (DVOR)SELEX Sistemi Integrati Inc.

11300 West 89th StreetOverland Park, KS 66214

USAT: 1-913-495-2600


• 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.

COURSE OBJECTIVES


LECTURE

MODEL 1150 DVOR IN CONTEXT OF GENERAL DVOR THEORY


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


TYPICAL INSTALLATION OF DVOR STATION

The Counterpoise is used for clean reflection of RF

pattern

Ring of 48 Sideband Antennas

Carrier Antenna in the center of the ring

The Transmitter is located in the shelter


TYPICAL ON-BOARD INDICATORS

VOR ONLY

The “bug” turns the bearing ring to select the direction the pilot wants to be traveling when he arrives at the VOR.

“bug”

Bearing ring

In this case the pilot wants to fly North toward the VOR from the South. He would be on radial 180.

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

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

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


TYPICAL ON-BOARD INDICATORS

VOR AND ILSA 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.


COMPARING THE TWO 30 Hz SIGNALS AT DIFFERENT AZIMUTHS

NORTH0 DEG

AM AND FM

SIGNALS

ARE IN

PHASE

WEST270 DEG

RADIAL AM LAGS FM

BY 270 DEG

SOUTH180 DEG

RADIAL AM LAGS FM

BY 180 DEG

EAST90 DEG

RADIAL AM LAGS FM

BY 90 DEG

AM

FM


Example

VOR

AM

FM

AM

FM

AM

FM

AM

FM

NORTH

EAST

SOUTH

WEST


COMPOSITE VOR SIGNAL

30 HZ COMPONENT

9960 HZ COMPONENT

THE 9960 COMPONENT VARIES ITS FREQUENCY THROUGHOUT ITS CYCLE

9960

9480

9960

10440

9960


SOURCE OF THE AM COMPONENT

RF MODULATED BY 30 Hz AUDIO

30 Hz AUDIO FROM

DETECTED RF


SOURCE OF 30 HZ FM SIGNAL

9960 Hz AUDIO WITH

30 Hz FREQUENCY

MODULATION

30 Hz AUDIO FROM

DISCRIMINATED

9960 AUDIO


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


ROTATION OF SIDEBAND ANTENNAS

USB

LSB

1

25 26

2

27

3


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

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

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

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


BLENDING OF TWO LOWER SIDEBAND SIGNALS IN ADJACENT ANTENNAS

ODD ANT

EVEN ANT

1 3

SUM IN SPACE

48 2 4

SIDEBAND 1 (SB3)

SIDEBAND 2 (SB4)


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


LECTURE

ALFORD LOOP ANTENNA


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


TOP VIEW OF CARRIER ANTENNA

Hole for DME antenna mast


TOP VIEW OF SIDEBAND ANTENNA


IMPEDANCE MATCHING NETWORK


PHYSICAL MAKEUP OF THE ALFOR LOOP ANTENNA

THE ALFORD LOOP IS TWO ORTHAGONAL

FOLDED DIPOLES.

ONE DIPOLE IS HIGHLIGHTED

HERE.


PHYSICAL MAKEUP OF THE ALFOR LOOP ANTENNA

THE OTHER DIPOLE IS

HIGHLIGHTED HERE.


REMAINING CURRENTS WITH INTERNAL CURRENTS CANCELLED

THE INTERNAL CURRENTS PRODUCE FIELDS OF

OPPOSITE AND EQUAL FIELD STRENGTH.

CONSIDER A MOMENT IN TIME. CURRENT FLOWS IN THE PICTURED

DIRECTIONS. ASSUMES 180 DEGREES OF

PHASE DIFFERENCE

BETWEEN THE TWO FOLDED

DIPOLES.

THEY CANCEL OUT EACH

OTHER, LEAVING ONLY THE FIELDS GENERATED BY THE EXTERNAL

ANTENNA SURFACES

THE RESULTING RF PATTERN IS OMNIDIRECTIONAL


LECTURE

TRANSMITTER CABINET

BLOCK DIAGRAM


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


MAIN COMPONENTS OF TRANSMITTER CABINET

TRANSMITTER 1

TRANSMITTER 2

RMS


AUDIO GENERATORAUDIO GENERATOR

CSB GENERATORCSB GENERATOR

SIDEBAND GENERATIONSIDEBAND GENERATION

RMSRMS

MONITORINGMONITORING

POWER SUPPLIESPOWER SUPPLIES


CSB GENERATION

Synthesizer produces CW RF

Audio Generator adds Audio

Modulated Carrier

(CSB) to the antenna

LPF eliminates harmonicsDirectional Coupler provides samples for Power and VSWR measurements

RF Monitor detects samples and provides audio to the Audio Generator for measurement


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


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,



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,



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,



Power Supplies

43 Vdc for Power Amplifier

Increases to 48 Vdc if modulation is above 43%.

28 Vdc for remaining circuits.

BCPS 1 powers Transmitter 1

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

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


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.


Identification Synchronization to the DME


LECTURE

PMDT OPERATION


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


SEC3

THREE

Double-click

PMDT icon Log in with

default username

and password


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


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)


Print data from this page to a printer

connected to this PC.

Copy data from this page to the clipboard.

The data can be pasted to other

programs (Word Pad, Word, Excel, email,

etc.)


PMDT Overview

Active RAM –

These values are the ones actually used by the DME

Screen RAM –

These values are the ones displayed on the screen

Non-volatile Backup Memory

PC storage device

Printer connected to the PMDT Laptop

APPLY (F7)RESET (F8)

System, PrintSystem, Configuration, Save

System, Configuration, Load

RMS, Config_Backup

RMS, Config_Restore

Transmitter CabinetPMDT PC

Memory Management


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.


•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


•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 semi-automatic 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


•Diagnostics

•Power-up results – shows the results of the digital circuitry test performed at the time of power up.

•Fault Isolation – Auto diagnostic software.


LECTURE

HARDWARE CONFIGURATION


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


Dip switch settings for frequency selection


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


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.


• 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.


1A9 Modem CCA Hardware configuration

Software Re-Installation procedures

Instructor will demonstrate the removal and replacement of software chips on a module.


LECTURE

CSB TRANSMITTER


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


1150-610

R81

1A4/A20

CARRIER FREQ.10 mW (TYP.)

J8

TP4

TP5

GND

TP1

TP2

TP3

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


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

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

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


Low-Pass Filter Assembly and Directional Coupler

The LPA Filters out harmonics

Reflected port to measure VSWR

Forward port to measure transmitted power

Feedback for phase and frequency lock

Carrier sample for test point


LECTURE

AUDIO GENERATOR


Objectives of Audio Generator Lecture

• The inputs and outputs 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

Composite output of the Audio Generator


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


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.


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).

Sideband phasor outputs of the Audio Generator

SB2/4 phase is fixed – it cannot be changed


Commutator switching outputs of the Audio Generator

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


Audio Generator serial communication to RMS

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

DC and audio levels from the RF Monitor.

Voice from automated system (ATIS) or microphone


LECTURE

SIDEBAND GENERATION


Objectives of Sideband Generation Lecture

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

Generator• Function of the Isolators


Sideband 1

720 “humps”/sec

CW RF @

Carrier freq Minus 10 KHz


Sideband 2

720 “humps”/sec

CW RF @

Carrier freq Minus 10 KHz


Sideband 1 (or 3)

Sideband 2 (or 4)


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.


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.

Sideband Generator Test Points


TP1 (TP10)Smooth transition

No noise on the rounded part (no spurious oscillations)

Sideband Generator Test Point 1/10


Sideband Frequency and Phase lock


Commutator


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

Isolators


LECTURE

PHASING CONSIDERATIONS


SYNTHPOWER

AMP

LPF, DIR CPLR,

RELAY

COMMU-

TATOR

XTAL

PHASER

Consider the electrical length of each path

SIDEBAND GENERATOR

PLL

PLL

PLL

PHASER

SIDEBAND GENERATOR

The CSB signal follows this path

All the RF signals originate from this point.


SYNTHPOWER

AMP

LPF, DIR CPLR,

RELAY

COMMU-

TATOR

XTAL

PHASER

Sideband 1 follows this path

SIDEBAND GENERATOR

PLL

PLL

PLL

PHASER

SIDEBAND GENERATOR


SYNTHPOWER

AMP

LPF, DIR CPLR,

RELAY

COMMU-

TATOR

XTAL

PHASER


SIDEBAND GENERATOR

PLL

PLL

PLL

PHASER

SIDEBAND GENERATOR


SYNTHPOWER

AMP

LPF, DIR CPLR,

RELAY

COMMU-

TATOR

XTAL

PHASER

All five signals must have the same phase in space

SIDEBAND GENERATOR

PLL

PLL

PLL

PHASER

SIDEBAND GENERATOR


SYNTHPOWER

AMP

LPF, DIR CPLR,

RELAY

COMMU-

TATOR

XTAL

PHASER

Sidebands 1 and 2 are the same frequency

SIDEBAND GENERATOR

PLL

PLL

PLL

PHASER

SIDEBAND GENERATOR

Using the PMDT, it is possible to adjust the phase of Sideband 1 to make it equal to Sideband 2.


SYNTHPOWER

AMP

LPF, DIR CPLR,

RELAY

COMMU-

TATOR

XTAL

PHASER

Sidebands 3 and 4 are the same frequency

SIDEBAND GENERATOR

PLL

PLL

PLL

PHASER

SIDEBAND GENERATOR

Using the PMDT, it is possible to adjust the phase of Sideband 3 to make it equal to Sideband 4.


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).


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).


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).


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.


LECTURE

RF MONITOR


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


RF Monitor inputs and outputs

Each of these inputs is RF

TX 1 Forward power

TX 1 Reflected power

Each output is audio, directed to Audio Generator

SB1 Reflected power

SB2 Reflected power

SB3 Reflected power

SB4 Reflected power

Each audio output is also seen on the test points.

The RF Monitor contains the Dummy Load for the Standby Transmitter

Sideband forward powers are not detected in the RF Monitor


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


LECTURE

MONITORS


Objectives of Monitors Lecture

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

signals are analyzed


Monitor Antenna

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


Detector 1

Detector 2

Test Generator

Standby Composite


Field Det 1

Field Det 2

Test Gen

Composite (TP5)MUX

30Hz Filter Peak Detector

Zero Crossing Detector

% Mod 30Hz AM

Square Wave

30Hz AM freq, Azimuth

9960 Hz Filter Peak Detector


% Mod 9960Hz AM

Square Wave

9960Hz freq

FM Discriminator Peak Detector


Dev. Ratio FM

Square Wave

30Hz FM freq, Azimuth

300 – 3KHz Filter

1020 Notch FL

1020Hz Filter

% Mod VoicePeak Detector

% Mod Ident

Freq Ident

Monitor CCA Simplified Block Diagram

DC Level Detector

RF Level


LECTURE

FIELD DETECTOR


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

Field Detector Lecture


LECTURE

REMOTE MAINTENANCE SYSTEM (RMS)


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.


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

Facilities CCA


1 M48V Sys. A BCPS 48 Vdc 2 S48V Sys. B BCPS 48 Vdc 3 M28V Sys. A BCPS 28 Vdc 4 S28V Sys. B BCPS 28 Vdc 5 M12V Sys. A LVPS 12 Vdc 6 S12V Sys. B LVPS 12 Vdc 7 M5V Sys. A LVPS 5 Vdc 8 S5V Sys. B LVPS 5 Vdc 9 M-12V Sys. A LVPS -12 Vdc 10 S-12V Sys. B LVPS -12 Vdc 11 GENLVL Test Generator Level 12 SPARE1 Spare 1 (future use) 13 MBCRET Sys. A BCPS Return (N/C) 14 BARO RET Barometer Sensor Return 15 SBCRET Sys. B BCPS Return (N/C) 16 WIND RET Wind Sensor Return 17 MTXRET Sys. A Transmitter Return 18 TX OUT (OUT) Antenna Status to RSCU 19 STXRET Sys. B Transmitter Return 20 TACH Tachometer 21 MBCOT Sys. A BCPS Overtemp Sta-

tus 22 MBCUPS Sys. A BCPS UPS Status

23 MBCBL Sys. A BCPS Battery Low Status

24 MBCPF Sys. A BCPS Power Fail Status

25 SBCOT Sys. B BCPS Overtemp Sta-tus

26 SBCUPS Sys. B BCPS UPS Status

27 SBCBL Sys. B BCPS Battery Low Status

28 SBCPF Sys. B BCPS Power Fail Status

29 MALM Monitor 1 Alarm 30 MNORM Monitor 1 Normal 31 MBYP Monitor 1 Bypass 32 SALM Monitor 2 Alarm 33 SNORM Monitor 2 Normal 34 SBYP Monitor 2 Bypass 35 MBCCD Sys. A BCPS Charger Dis-

connect (ON/OFF) 36 SBCCD Sys. B BCPS Charger Discon-

nect (ON/OFF) 37 #1 ON Turn-on Sys. A Signal

from RSCU Control Interface CCA

38 #2 ON Turn-on Sys. B Signal from RSCU Control Interface CCA

39 OFF Turn-off On-Air System Signal from RSCU Control Interface CCA

40 TX IND (IN) On-Air Transmitter Indicator Status from Relay 1K1

41 SPARE 8 Spare 8 (future use) 42 Spare 7 Spare 7 (future use) 43 TRANSFER Transfer Status to RSCU

Control Interface CCA 44 SPARE2 Spare 2 (future use)

45 SPARE3 Spare 3 (future use) 46 SPARE4 Spare 4 (future use) 47 SPARE 5 Spare 5 (future use) 48 TIME INTER-

VAL INTO Signal from CPU CCA

49 SPARE 6 Spare 6 (future use) 50 FAN2 (Disabled)

Facilities CCA Inputs and Outputs


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)

Serial Interface 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.

Test Generator CCA


Two modems on this module:

1. Dedicated line for RCSU

2. Dialup modem for remote PMDT connection

Modem CCA


Optional RSCU Interface

Allows interface between VOR and obsolete 1138 RSCU.


Low Voltage Power Supplies

1150-113

A18POWER PANEL

(PART OF) 1A34POWER SUPPLY (STANDBY)950350-0002

950350-0002POWER SUPPLY (MAIN)

1A33

030398-0002

030757-0001

030749-0001

030363-0002

030757-0001

030398-0002

012616-1003

012617-1003

012743-0001

012743-0001

012743-0001

012618-1003

012689-1001

012620-0001

012619-0002

012101-1001

012617-1003

012616-1003

A1 RF MONITOR ASSEMBLY

SIDEBAND GENERATOR

SYTHESIZER

CSB POWER AMPLIFIER

JACK ASSEMBLY

SYTHESIZER

SIDEBAND GENERATOR

AUDIO GENERATOR

MONITOR

LOW VOLTAGE POWER SUPPLY



CPU

TEST GENERATOR

FACILITIES

SERIAL INTERFACE

MODEM

MONITOR

AUDIO GENERATOR

A2

1A7

1A8

1A9

1A10

SPARE 1SPARE 2

1A11

1A12

1A13

1A14

1A15

1A16

1A24

1A23

1A21

1A20

1A19

1A38

1A4

1A3

1A5

CCA DISPLAY A1A1 & A1A2

SYSTEM

NORM

AC INPUTPOWER

DC INPUTPOWER

BA

OFF

ON

ON

OFF

AUDIO

1150 VORSYSTEM A

OFF

ON

INTERNATIONAL,INC.SYSTEMSAIRPORT

CABINET DOOR REMOVED FOR CLARITY

ON

OFF

MIC

NORM ALARM BYPASS

030364-0001

OR 030363-0003

OR 030363-0003030363-0002

SIDEBAND GENERATOR1A6 030398-0002

SIDEBAND GENERATOR030398-0002

1A221A14 supplies the RMS

1A15 supplies Transmitter 1

1A16 supplies Transmitter 2


Commutator CCAs

3537

13

57

9

11131517

1921

23 27

3331

29

25

3941

4345

47

SB1

SB3

3638

24

68

10

12141618

2022

24 28

3432

30

26

4042

4446

48

SB2

SB4


•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.

Procedures not covered during labs


LECTURE

FLIGHT CHECK


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.


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


Transmitters, Configuration, Nominal

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.

For one, the flight crew will announce the Station Error, or Offset.

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.


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.



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.


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.



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.



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.


Monitors, Configuration, Offsets and Scale Factors30 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.

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