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RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT TECHNICAL PUBLISHERS

4lliedSignal ELECTRONIC AND AVIONICS SYSTEMS

MAINTENANCE MANUAL

BENDIX/KING® RDS81 COLOR WEATHER RADAR SYSTEM

UP495246

MANUAL NUMBER 006-05997-0003 REVISION 3 AUGUST, 1993

RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT TECHNICAL PUBLISHERS

COPYRIGHT NOTICE

UP495246

e1995 AlliedSignal, Inc.

Reproduction of this publication or any portion thereof by any means without the express written permission of AlliedSignal, General Aviation Avionics, is prohibited. For further information contact Technical Publications, AlliedSignal, General Aviation Avionics, 400 North Rogers Road, Olathe, :Kansas, 66062. Telephone: (913) 768-2398.

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BENDIX/KING ADS 81 COLOR WEATHER RADAR SYSTEM REVISION HISTORY AND INSTRUCTIONS MANUAL REVISION PART NUMBER

RDS 81 Maintenance Manual 3, AUGUST, 1993 006-05997-0003

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BENDIX/KING ADS 81 COLOR WEATHER RADAR SYSTEM REVISION HISTORY AND INSTRUCTIONS MANUAL REVISION PART NUMBER

ADS 81 Maintenance Manual 2, SEPTEMBER 1992 006-05997-0002

UP495246

This revision is a complete system manual and supersedes previous revision level manuals. Superseded manuals should be discarded.

MMRDS81 SBH.AGO Rev 2 Sep/92

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BENDIX RDS 81 COLOR WEATHER RADAR SYSTEM REVISION HISTORY AND INSTRUCTIONS

MANUAL: REVISION: PART NUMBER:

RDS 81 Color Weather Radar System Maintenance Manual 1. September, 1989 006-05997-0001

Add, delete, or replace pages as indicated below and retain all tabs and dividers. Insert this page immediately behind the title page as a record of revisions. This revision level of this manual consists of the following individual publications: RDS 81 Installation Manual RS 811A Maintenance Manual IN 812A Maintenance Manual

UP495246

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MAINTENANCE MANUAL

BENDIX/KING® RS811A

UP495246

RADAR SENSOR

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BENDIX/KING RS 81 1A RADAR SENSOR

SECTION IV THEORY OF OPERATION Paragraph

Page

4.1

GENERAL ..............................................................................................................................4-1

4.2

GENERAL CIRCUIT THEORY ...................................................................................................4-2

4.2. 1 4.2.2 4.2.3

ARINC 708 Control Words and ARINC 429 Characteristic .........................................................4-2 ARINC 708 Data Word and ARINC 453 Data Bus .....................................................................4-9 Block Diagram Discussion .......................................................................................................4-20

4.3

DETAILED CIRCUIT THEORY ...................................................................................................4-36

4.3. 1 4.3.2 4.3.3 4.3.4 4.3.5

Microwave Assembly .............................................................................................................4-36 Preamplifier Module ................................................................................................................4-36 Receiver Module ....................................................................................................................4-39 Control/Logic Module ..............................................................................................................4-39 Power Supply/Modulator Module .............................................................................................4-47

SECTION V MAINTENANCE Paragraph

Page

5.1

INTRODUCTION .....................................................................................................................5-1

5.2

TEST AND ALIGNMENT .........................................................................................................5-1

5.2. 1 5.2.2 5.2.3 5.2.4 5.2.5

Test Equipment Required ........................................................................................................5-1 Conditions for Testing ............................................................................................................5-5 Alignment Procedure ..............................................................................................................5-5 Final Test Procedure ...............................................................................................................5-1 8 Final Test Data Sheet .............................................................................................................5-23

5.3

OVERHAUL ...........................................................................................................................5-27

5.3. 1 5.3.2 5.3.3 5.3.4 5.3.5

Visual Inspection ....................................................................................................................5-27 Cleaning ................................................................................................................................5-28 Repair ...................................................................................................................................5-28 Disassembly ..........................................................................................................................5-29 Assembly .............................................................................................•................................5-32

SECTION VI ILLUSTRATED PARTS LIST Item

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1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 1 1.

Page Introduction ...........................................................................................................................6-1 ROSS 1 Receiver/Transmitter ...................................................................................................6-8 Final Assembly ......................................................................................................................6-9 System Software Set (-00004-) ..............................................................................................6-1 3 System Software Set (-00006-) ..............................................................................................6-13 Hardware/Software Set (-00496-) ...........................................................................................6-13 Hardware/Software Set (-00498-) ...........................................................................................6- 14 Software Set (-00564-) ..........................................................................................................6-14 Software Set (-00470-) ..........................................................................................................6-14 Software EPLD ......................................................................................................................6-14 Logic Module (-07553-) ..........................................................................................................6-15

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BENDIX/KING RS 811A RADAR SENSOR

SECTION VI ILLUSTRATED PARTS LIST (Cont'd) Item 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26.

Page Logic Module (-07943-) ...............................................................•..........................................6-65 429 Register Module : .............................................................................................................6-123 PRF Timer Module .•........................................................................•.....•....•............................6-129 Oscillator Board .....................................................................................................................6-135 Pitch Assembly ......................................................................................................................6-141 Tilt Motor Assembly ................................................................................................................6-145 Azimuth Drive Assembly .........................................................................................................6-151 Scan Motor Assembly ............................................................................................................6-157 Microwave Assembly .............................................................................................................6-161 Mixer/Preamp Module .............................................................................................................6-175 Wiring Assembly ....................................................................................................................6-195 Power Supply Module (-07544-) ..............................................................................................6-201 Power Supply Module (-07906-) ..............................................................................................6-215 Antenna Module .....................................................................................................................6-239 Receiver Module ..................................................................................; ................................. 6-253

LIST OF ILLUSTRATIONS Page

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Figure 4-1 4-2 4-3 4-4 4-5 4-6 4-7 4-8 4-9 4-10 4-11 4-12 4-13 4-14 4-15 4-16 4-17 4-18 4-19 4-20 4-21 4-22 4-23

Typical Weather Radar System Configuration ...........................................................................4-3 Typical ARINC 708 Control Words With ARINC 429 Characteristic ............................................ 4-4 Typical ARINC 453 Characteristics ..........................................................................................4-1 0 ARINC 453 Sync Pulse Structure .............................................................................................4-11 RS 811 A Simplified Block Diagram ..........................................................................................4-22 RS 811 A Radar Sensor Block Diagram .....................................................................................4-25 Typical Example of STC and Extended STC, 80 Mile Range .......................................................4-28 Simplified WX Attenuation Compensation Curve, 40 Mile Range ................................................4-29 Simplified Microcomputer Circuit .............................................................................................4-32 Microwave Assembly .............................................................................................................4-37 RS 811 A Preamplifier Block Diagram .......................................................................................4-38 RS 811 A Receiver Module Block Diagram ................................................................................4-38 RS 811 A Video Input and Accumulator Circuit Block Diagram .................................................... 4-40 RS 811 A Control/Logic Module Timing, Accumulator Circuit ......................................................4-40 RS 811 A Accumulator Address Control Circuit Block Diagram ...................................................4-41 RS 811 A Processor Control Circuits Block Diagram ...................................................................4-42 RS 81. 1A Clock Control Timing Block Diagram ..........................................................................4-43 RS 811 A Pulse Width and Pin Diode Control Circuit Block Diagram .............................................4-44 RS 811 A Gyro Input A to D Circuit Block Diagram ....................................................................4-46 RS 811 A STC and WX Compensation Circuit Block Diagram ......................................................4-46 RS 811A ARINC 429 Receiver Circuit Block Diagram ................................................................4-47 RS 811 A Modulator Circuit Block Diagram ...............................................................................4-48 RS 811 A Power Supply Block Diagram ....................................................................................4-49

5-1 5-2 5-3 5-4 5-5 5-6 5-7 5-8 5-9 5-10 5-11 5-12 5-13 5-14

Bench Test Harness Wiring Diagram ...................................... , ................................................. 5-3 Test Equipment Setup ........................................... ,................................................................ 5-6 Termination for RS 811A Radar Sensor Using RD-300 Weather Radar Test Set ........................... 5-7 Time Delay Waveform ............................................................................................................5-S Solid State Limiter Diode Red and Yellow Wire Terminal Waveform ............................................ 5-9 Solid State Limiter Diode Violet Wire Terminal Waveform .......................................................... 5-S Current Pulse Waveform ......................................... ; ...............................................................5-10 Microwave Assemblies ...........................................................................................................5-11 Waveform With No Discontinuity .............................................................................................5-13 Waveforms Showing Discontinuity ..........................................................................................5-13 Hidden Page Menu .................................................................................................................5-15 R/T Calibration Page ...............................................................................................................5-15 Location of Tilt Feedback Potentiometer ...................................................................................5-16 Pitch Axis Assembly Bottom Pivot ...........................................................................................5-33

ii MMRDS81 SBH.AE6 Rev 3 Aug/93

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· BENDIX/KING RS 811A RADAR SENSOR

LIST OF ILLUSTRATIONS (Cont'd) Figure 6-1 6-2 6-3A 6-4A 6-5 6-6 6-7 6-8 6-9 6-10 6-11 6-12 6-13 6-14 6-15 6-16 6-17 6-18 6-19 6-20A 6-21 6-22A 6-23 6-24A 6-25 6-26A 6-27 6-28A 6-29A 6-30 6-31 6-32 6-33 6-34 6-35 6-36 6-37 6-38A 6-39A 6-40 6-41 6-42A 6-43 6-44A

Page Typical Bill of Materials ............................................................•..............................................6-5 Final Assembly ......................................................................................................................6-1 1 Logic Module (-07553-1 ..........................................................................................................6-21 Logic Module Schematic (-07553-1 ..........................................................................................6-25 Logic Module (-07943-00101 ..................................................................................................6-79 Logic Module Schematic (-07943-001 01 .................................................................................. 6-8 1 Logic Module (-07943-001 1I ..................................................................................................6-89 Logic Module Schematic (-07943-00111 ..................................................................................6-91 Logic Module (-07943-00201 ..................................................................................................6-99 Logic Module Schematic (-07943-00201 .................................................................................. 6-103 429 Register Board ................................................................................................................6-125 429 Register Schematic .........................................................................................................6-127 PRF Timer Board ....................................................................................................................6-131 PRF Timer Schematic .............................................................................................................6-133 Oscillator Board .....................................................................................................................6-137 Oscillator Schematic ...............................................................................................................6-1 39 Pitch Assembly ......................................................................................................................6-143 Tilt Motor Assembly (-00001 ...................................................................................................6-147 Tilt Motor Assembly (-00011 ....................................................................................................6-149 Azimuth Drive Assembly .........................................................................................................6-1 53 Scan Motor Assembly ............................................................................................................6-159 Microwave Assembly (-00001 .................................................................................................6-163 Microwave Assembly (-0010/-00131 .......................................................................................6-173 Mixer/Preamp Module (-00011 .................................................................................................6-179 Mixer/Preamp Schematic (-0001 I ............................................................................................6-1 83 Mixer/Preamp Module (-00021 .................................................................................................6-185 Mixer/Preamp Schematic (-00021 ...................................................................................: ........ 6-189 Mixer/Preamp Module (-001 01 .................................................................................................6-189. 1 Mixer/Preamp Schematic (-00101 ............................................................................................6-191.1 Wiring Assembly ....................................................................................................................6-197 Wiring Schematic ...................................................................................................................6-199 Power Supply Module (-07544-1 ..............................................................................................6-207 Power Supply Schematic (-07544-1 .........................................................................................6-209 Power Supply Module (-07906-00001 ........................................................... oo ...... ooo ... o.. ooo ..... oo6-221 Power Supply Schematic (-07906-00001 ........................................... ; ........ 6-225 Power Supply Module (-07906-00011 ......................................................................................6-231 Power Supply Schematic (-07906-00011 .................................................................................6-233 Antenna Drive Module (-00001 ......................... o............................. o........... o......... o.o ... o.. o•·······o6-241 6-245 Antenna Drive Schematic (-00001 ............................................................................ Antenna Drive Module (-00011 .......................................................................... 6-249 Antenna Drive Schematic (-0001 I ............................................................................................6-251 Receiver Module ....................................................................................................................6-255 Receiver Schematic (-00001 ............. : ......................................................................................6-267 Receiver Schematic (-00011 ....................................................................................................6-269 0 ............................

0

...............

0 .....................

LIST OF TABLES Table

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4-1 4-2 4-3 4-4 4-5 4-6 4-7 4-8 4-9 4-1 0

Page Control Word Labels ..................................... 4-5 Control Word Mode Codes ........................ 4-5 Control Word Tilt BITS 17 Through 23 .....................................................................................4-6 Control Word Gain Codes ...................... o.......... o.. o•••oooo ........... o... o... •o······o•o ..... o•·o· .... 4-6 Control Word Status Matrix BITS 30 and 31 .............................................................................4-7 Roll Trim Data ......................................... 4-8 Range Codes in Control Word 2 ...............................................................................................4-8 Data Word Control Accept Matrix BITS 9 and 10 ......................................................................4- 1 1 Weather Data Word Fault Coding .............................................................................................4-1 3 Weather Data Word Mode Codes .............................................................................................4-1 3 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 0 •••••••• 0. 0 0. 0 . . . . . . . . 0 •••••

0 . . . . . . . . . . . 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 . . . . . . . 0 0 . . . . . . . . . 0 0. 0 •••• 0 . . . . . . . . .

OOoO • •

.........

0 ....................................... 0 0 .....................................

iii MMRDS81 SBH.AE6 Rev 3 Aug/93

0

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BENDIX/KING RS 811A RADAR SENSOR

LIST OF TABLES (Cont'd) Page

Table 4-11

4-12 4-13

4-14 4-15 4-16

4-17

4-18

4-19 4-20

4-21 4-22 4-23

5-1 5-2 5-3 5-4

5-5 5-6

5-7

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5-8

Weather Data Word Antenna Tilt Codes •.•..............••..................•.•.••.•..•..•..•.............................4-1 3 Weather Data Word Gain Codes •....•.•....••.......•......••..............••...•..••.•••••..................................4-14 Weather Data Word Range Codes .•......••..•...................•.....•.•.••...••••••••......•..............................4-14 Weather Data Word Accept Codes •.••••••.••.•....•....•..••••.•........•.•••..•••••••••••••..•••.......•................... 4-14 Weather Data Word Scan Angle Codes •.............................................•.......•............................. 4-15 Weather Data Word Weather Range BIN Codes (BIN 1 I ..............................................................4-17 Maintenance Codes ................................................................................................................4-18 Software Revision Level Codes ................................................................................................4-18 400 Hz Reference Angle Codes ...............................................................................................4-19 Antenna Azimuth Position .......................................................................................................4-19 Clock Frequencies, Source, and Application ..............................................................................4-21 Level Accumulation vs Range ..................................................................................................4-28 Control/Logic Module Schematic Diagram Mnemonics ...............................................................4-34 STC 1'reshold Alignment Data .,. .............. : ..........................: .......,. ............................................. 5-14 Equations for STC Threshold Alignment W1th Wx Compensation D1sabled ................................... 5-14 WX Mode Pulse and Power .....................................................................................................5-19 Map Mode Pulse and Power .....................................................................................................5-19 MDS Ranges ..........................................................................................................................5-20 STC Threshold Data ...............................................................................................................5-20 Equations for STC Threshold With Wx Compensation Disabled ................................................... 5-21 Screw and Nut Torque Values .................................................................................................5-33

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SECTION IV THEORY OF OPERATION Page

Paragraph 4.1

GENERAL ..............................................................................................................................4-1

4.2

GENERAL CIRCUIT THEORY ...................................................................................................4-2

4.2. 1 4.2.2 4.2.3

ARINC 708 Control Words and ARINC 429 Characteristic .........................................................4-2 ARINC 708 Data Word and ARINC 453 Data Bus .....................................................................4-9 Block Diagram Discussion .......................................................................................................4-20

4.3

DETAILED CIRCUIT THEORY ...................................................................................................4-36

4.3. 1 4.3.2 4.3.3 4.3.4 4.3.5

Microwave Assembly .............................................................................................................4-36 Preamplifier Module ................................................................................................................4-36 Receiver Module ....................................................................................................................4-39 Control/logic Module ..............................................................................................................4-39 Power Supply/Modulator Module .............................................................................................4-47

LIST OF ILLUSTRATIONS

Page

Figure 4-1 4-2 4-3 4-4 4-5 4-6 4-7 4-8 4-9 4-10 4-11 4-12 4-13 4-14 4-15 4-16 4-17 4-18 4-19 4-20 4-21 4-22 4-23

Typical Weather Radar System Configuration ...........................................................................4-3 Typical ARINC 708 Control Words With ARINC 429 Characteristic ............................................4-4 Typical ARINC 453 Characteristics ..........................................................................................4-1 0 ARINC 453 Sync Pulse Structure .............................................................................................4-11 RS 811 A Simplified Block Diagram ..........................................................................................4-22 RS 811 A Radar Sensor Block Diagram .....................................................................................4-25 Typical Example of STC and Extended STC, 80 Mile Range .......................................................4-28 Simplified WX Attenuation Compensation Curve, 40 Mile Range ................................................4-29 Simplified Microcomputer Circuit .............................................................................................4-32 Microwave Assembly .............................................................................................................4-37 RS 811 A Preamplifier Block Diagram .......................................................................................4-38 RS 811 A Receiver Module Block Diagram ................................................................................4-38 RS 811 A Video Input and Accumulator Circuit Block Diagram ....................................................4-40 RS 811 A Control/Logic Module Timing, Accumulator Circuit ......................................................4-40 RS 811 A Accumulator Address Control Circuit Block Diagram ...................................................4-41 RS 811 A Processor Control Circuits Block Diagram ...................................................................4-42 RS 811 A Clock Control Timing Block Diagram ..........................................................................4-43 RS 811 A Pulse Width and Pin Diode Control Circuit Block Diagram .............................................4-44 RS 811 A Gyro Input A to D Circuit Block Diagram ....................................................................4-46 RS 811 A STC and WX Compensation Circuit Block Diagram ......................................................4-46 RS 811 A ARINC 429 Receiver Circuit Block Diagram ................................................................4-4 7 RS 811 A Modulator Circuit Block Diagram ...............................................................................4-48 RS 811 A Power Supply Block Diagram ....................................................................................4-49

LIST OF TABLES

UP495246

Table

Page

4-1 Control Word Labels ...............................................................................................................4-5 4-2 Control Word Mode Codes ......................................................................................................4-5 4-3 Control Word Tilt BITS 17 Through 23 .....................................................................................4-6 4-4 Control Word Gain Codes ........................................................................................................4-6 4-5 Control Word Status Matrix BITS 30 and 31 .............................................................................4-7 Roll Trim Data ........................................................................................................................4-8 4-6 Range Codes in Control Word 2 ...............................................................................................4-8 4-7 MMRDS81 SBHR2.AE3 4-i Rev 2 Sep/92

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BENDIX/KING RS 811A RADAR SENSOR

UP495246

LIST OF TABLES (Cont'd)

Table

Page

4-8 4-9 4-1 0 4-11 4-12 4-13 4-14 4-15 4-16 4-17 4-18 4-19 4-20 4-21 4-22 4-23

Data Word Control Accept Matrix BITS 9 and 10 ......................................................................4-11 Weather Data Word Fault Coding .........................................•...................................................4-13 Weather Data Word Mode Codes ..............................................................•..............................4-13 Weather Data Word Antenna Tilt Codes ...................................................................................4-13 Weather Data Word Gain Codes ..............................................................................................4-14 Weather Data Word Range Codes .............................................................•.•............................4-14 Weather Data Word Accept Codes ..........................................•................................................4-14 Weather Data Word Scan Angle Codes ....................................................................................4-15 Weather Data Word Weather Range BIN Codes (BIN 1) ............................................................ ..4-17 Maintenance Codes .......................•....•...................................................••..............................4-18 Software Revision Level Codes ............................•.............................................................•.....4-18 400 Hz Reference Angle Codes •..............................................................................................4-19 Antenna Azimuth Position .......................................................................................................4-19 Clock Frequencies, Source, and Application ......................................................•.......................4-21 Level Accumulation vs Range ............................................•.....................................................4-28 Control/Logic Module Schematic Diagram Mnemonics ..................•............................................4-34

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BENDIX/KING RS 811A RADAR SENSOR

SECTION IV THEORY OF OPERATION 4.1 GENERAL This section provides a general description and operation of the RS 811 A Radar Sensor. Subsequent information includes operation, block diagram discussions, and theory of operation. One connector provides interfacing between the Sensor and Indicator of the RDS 81 Weather Radar System. The RS 811 A Radar Sensor receives range, mode, and various other information in an ARINC 708 Control Word from the Radar Indicator. The RS 811A transmitter emits very short, intense pulses of microwave energy, and any reflective object within the range of the Radar system will reflect a portion of the radiated microwave energy directly back to be received by the flat plate antenna. The received signal is routed from the antenna to the receiver chain where it is amplified, detected, and converted into digital data representative of the target density. This digital data is accumulated, integrated, and sent to the Color Radar Indicator via a high-speed ARINC 453 data bus in Rho-Theta format. The Indicator buffers and converts this incoming Rho-Theta data to an X-Y format suitable for display on the color CRT with Green, Yellow, Red, and Magenta representing increasing levels of target density. The pilot has manual control of the receiver gain during ground mapping in order to optimize the display. Operating power from the + 28VDC aircraft power source is supplied to the power supply sections of the Radar Indicator and Sensor, which are energized whenever the Indicator function switch is rotated from its OFF position. All DC voltages required to operate these units are internally generated by these power supplies. The RS 811 A Radar Sensor contains a microprocessor which directly controls the operation of the STC, AGC, AFC, Manual GAIN, and antenna position. The multiple function inputs to the Color Radar Indicator enable optional accessory units to display data on the Indicator screen. Accessory units other than Radar graphics units must be interfaced to the Indicator through a remote computer unit, which minimizes interconnections by utilizing serial data connections. The RS 811 A has two separate ARINC 429 serial inputs, which allow up to two Indicators to interface to the Radar Sensor. Processed weather data is sent from the Radar Sensor to the Indicator over the ARINC 453 bus. This digital interface provides ready compatibility with other systems, such as Electronic Flight Instrument Systems. The pulse width and PRF of the Radar transmitter are varied by the microprocessor as a function of selected range and mode in order to optimize the resolution and weather penetration of the Radar system. Digital automatic frequency control (AFC) of the Local Oscillator is accomplished by continually varying the Local Oscillator tuning voltage during the transmit period and sampling the 'main bang' video level to determine the optimum voltage setting. All accumulation and processing of weather data takes place in the Radar Sensor. The processed weather data is then sent to the Indicator over the ARINC 453 bus in Rho-Theta format at a rate of one azimuth radial every 16.8 ms. Analog pitch and roll inputs from the aircraft gyro are converted to digital data and presented to the microprocessor, which controls the antenna tilt to implement line-of-sight stabilization. The microprocessor also controls the antenna azimuth position.

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The AS 811A utilizes an integrated Microwave Assembly that contains an X-band balanced mixer, PIN diode limiter, Preamplifier, and PIN diode duplexer. The Local Oscillator and magnetron are mounted to the Microwave Assembly, which is in turn mounted directly to the flat-plate antenna. This technique eliminates the flexible waveguide utilized in older Radar systems to couple the microwave energy to the antenna.

MMRDS81 SBH.AA6 Rev 2 Sep/92

Page 4-1

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BENDIX/KING RS 811A RADAR SENSOR

4.2 GENERAL CIRCUIT THEORY The following is a discussion of general theory and concepts for the RS 811 A. 4.2. 1 ARINC 708 CONTROL WORDS AND ARINC 429 CHARACTERISTIC The IN 812A Indicator controls the RS 811A Radar Sensor using a serial bus defined by ARINC 429 and 708. The Radar Sensor has two ARINC 429 input ports which permit control from one or two Radar Indicators. Each Indicator generates three different 32 bit ARINC 708 Control Words, alternately supplied to the Sensor on its own two-wire ARINC 429 bus. Control Word 1 (label 270) contains a stabilization bit, three mode bits, seven tilt bits, six Manual GAIN bits, two status matrix bits and a parity bit. Control Word 2 (label 271 l contains several spare bits, a maintenance request bit, a range scale bit, six roll trim bits, six range bits, two status matrix bits and a parity bit. Control Word 3 is not used by the RDS 8 1 system and is ignored by the Radar Sensor. The parity bits are set to render odd parity. Each word is transmitted at maximum intervals of 100 milliseconds. The Control Words are bipolar, as defined by ARINC 429, with a logic 1 represented by a positive voltage and a logic 0 represented by a negative voltage. Figure 4-1 illustrates a typical 32 bit word. Observe that the first half of each bit is at the defined logic level and the second half of each bit returns to zero. The Indicator 429 transmitter circuits will produce a gap of 320 psec minimum between Con~rol Words. NOTE: The logic voltage is measured differentially between the two wires of the ARINC 429 control bus. The signal on either side will be the complement of the other when measured with respect to chassis ground. 4.2.1. 1 Control Word 1 A. label (Bits 1 through 8) Bits 1 through 8 in each Control Word represent the digital label. The label for Control Words 1, 2 and 3 are octal 270, 271 and 27 3 respectively. The format of these labels is shown in Table 4-1. B. SOl (Bits 9 and 10) Bits 9 and 10 are Source/Destination Identification bits. These bits are not used in this system and may be at either level in the Control Words. C. Sector Scan Angle (Bit 11 l Bit 11 is defined for systems that can operate with a reduced scan angle. This bit is a logic 0 when normal sector scan is selected and is a logic 1 when reduced sector scan is selected. Bit 11 is not used in this system and may be at either logic level. D. Anticlutter (Bit 12) Bit 12 is defined as a logic 0 when anticlutter is off and as a logic 1 when anticlutter is on. The RDS 81 Radar system does not employ anti clutter circuitry, and bit 12 may be at either logic level. E. Stabilization (Bit 13)

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Bit 13 is a logic 0 when the Indicator is set for stabilization off (STAB OFF) and is a logic 1 when the Indicator is set for stabilization on (STAB ON). ·

Page 4-2

MMRDS81 SBH.AA6 Rev 2 Sep/92

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BENDIX/KING RS 811A RADAR SENSOR

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400 Hz RE~

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DATA

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COLOR RADAR INDICATOR

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OPTIONAL MULTIPLE FUNCTIONS INPUTS ------

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UP495246

FIGURE 4-1 TYPICAL WEATHER RADAR SYSTEM CONFIGURATION

MMRDS81 SBH.AAS Rev 2 Sep/92

Page 4-3

RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT TECHNICAL PUBLISHERS

BENDIX/KING RS 811A RADAR SENSOR

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UP495246

FIGURE 4-2 TYPICAL ARINC 708 CONTROL WORDS WITH ARINC 429 CHARACTERISTIC

Page 4-4

MMRDS81 SBH.AA6 Rev 2 Sep/92

RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT TECHNICAL PUBLISHERS

BENDIX/KING RS 811A RADAR SENSOR F. Mode (Bits 14, 15, and 161 Bits 14, 15 and 16 represent the mode selected by the Indicator. These bits will be as shown in Table 42. Not all available modes are used in the RDS 81 system.

BIT POSITION IN WORD

LSB 1

Control Word No. 1 Control Word No. 2 Control Word No. 3

2

3

4

0 0 0

1

1 1 1

1 1

5

6

7

0 0 0

0 0

1

MSB

8

OCTAL VALUE

0

270 271 273

1 1

TABLE 4-1 CONTROL WORD LABELS

MODE

BIT 16

Standby Wx only GND Map only Contour/WxA (not used) Test Turbulence only (not used) Wx + Turbulence (not used) Spare (not used)

0 0 0 0 1 1 1 1

BIT 15 0 0 1 1 0 0 1 1

BIT 14 0 1 0 1 0 1 0 1

TABLE 4-2 CONTROL WORD MODE CODES G. Tilt (Bits 17 through 23) Bits 17 through 23 represent the position of the Indicator TILT control. Positive (UP) tilt is represented by a standard seven bit binary code, and negative (DOWN) tilt is represented by a seven bit two's complement code. The two's complement is derived by subtracting each digit from one less than the base, adding one to the least significant digit, and executing all required carries. Refer to Table 4-3.

UP495246

The least significant bit in the seven bit word changes with each 0.25° of tilt. It therefore requires two bits to represent 1 o of tilt and six bits to represent 15° of tilt. Bit 23 is high whenever the tilt is negative and represents -16 o when it is a logic 1. The other six bits in the two's complement code represent a number that when added to -16 will equal the negative tilt angle.

MMRDS81 SBH.AA6 Rev 2 Sep/92

Page 4-5

RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT TECHNICAL PUBLISHERS

BENDIX/KING RS 81 1A RADAR SENSOR

TILT UP CODES BIT 23 22 21 20 19 18 17 0 0 0 0 0 0 0 0 0 0

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UP UP UP UP UP UP UP UP UP UP

0 1 0 1 0 1 0 1 0 1

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TABLE 4-3 CONTROL WORD TILT BITS 17 THROUGH 23 H. Gain (Bits 24 through 29) Bits 24 through 29 represent the position of the Indicator Manual GAIN control. These bits are 000000 when the GAIN control is fully clockwise (max gain). The GAIN control codes change in accordance with Table 4-4 as the GAIN control is rotated counter clockwise (reduced gain). I.

Status Matrix (Bits 30 and 31 l Bits 30 and 31 are always a logic 0. Refer to Table 4-5 for their defined format.

J. Parity (Bit 32) Bit 32 is always set to render odd parity. The number of logic 1 bits in each word, including the parity bit, should be an odd number.

GAIN

BIT 29

BIT 28

BIT 27

BIT 26

BIT 25

BIT 24

Maximum -1 -2 -3 -4 -5

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~

~

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'

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'

1 1 1

'

0 1 1

'

1 0 1

UP495246

TABLE 4-4 CONTROL WORD GAIN CODES

Page 4-6

MMRDS81 SBH.AA6 Rev 2 Sep/92

RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT TECHNICAL PUBLISHERS

BENDIX/KING RS 81 1A RADAR SENSOR

DATA STATUS Valid Data Invalid Data (not used) Test (not used) Slave (not used)

BIT 31

BIT 30

0 0

0

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0

1

TABLE 4-5 CONTROL WORD STATUS MATRIX BITS 30 AND 31 4.2. 1.2 Control Word 2 A. Label (Bits 1 through 81 Bits 1 through 8 represent the digital label. The label for Control Word 2 is octal 271. Refer to Paragraph 4.2. 1. 1 (AI for details. B. SDI (Bits 9 and 10) Bits 9 and 10 are not used by the RDS 8 1 system and may be at either logic level. C. Maintenance Request (Bit 1 11 Bit 1 1 will be a logic 0 for normal Radar operation. This bit will be a logic 1 whenever the Radar Indicator requests the hidden maintenance page. The Radar Sensor will respond to this request by sending the requested maintenance data to the Indicator on bits 1 1 through 22 of the ARINC 453 maintenance word. D. Anticlutter (Bit 121 Bit 12 is not used in the RDS 8 1 system and may appear at either logic level. The RDS 81 system does not employ anticlutter circuitry. E. Roll Trim Data (Bits 13 through 181 Bits 1 3 through 18 are used to supply roll trim correction data from the potentiometer on the front panel of the Indicator to the Sensor. Positive angles are represented by a standard six bit binary code, and negative angles are represented by a six bit two's complement code. The least significant bit in the code changes with each 0.125°, and six bits can therefore represent a total of so of correction (±4°). This method of encoding is similar to that used for the tilt angles, except that bit 18 represents -4°. Table 4-6 shows the format of this data. NOTE: The two's complement code is used to simplify arithmetic in the microprocessor. Observe that the sum of + 1.5° (001 1001 and -1.5° (1 101001 is oo (000000). F. Spares (Bits 19 through 221 Bits 19 through 22 are spare bits and may appear at either logic level. G. Range Scale (Bit 231

UP495246

Bit 23 is defined by ARINC 708 as the range scale bit and is used to obtain very short ranges. The normal ranges would be divided by 20 whenever this bit is a logic 1. For example, the 5 NM range code 000001 would represent a decreased range of 0.25 NM when this bit is a logic 1. This bit is not used in the RDS 81 system and will be set to a logic 0.

MMRDSS 1SBH.AA6 Rev 2 Sep/92

Page 4-7

RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT TECHNICAL PUBLISHERS

BENDIX/KING AS 811A RADAR SENSOR H. Range Code (Bits 24 through 29) Bits 24 through 29 represent the range selected on the Indicator. Table 4-7 shows all available codes. Note that the 5 NM and the 320 NM ranges are not used in the ADS 81 system. I.

Status Matrix (Bits 30 and 31 ) Bits 30 and 31 will always be a logic 0 for valid data. Refer to Paragraph 4.2.1.1 (1).

POSITIVE ROLL TRIM BIT 18 17 16 15 14 13

NEGATIVE ROLL TRIM BIT 18 17 16 15 14 13

ROLL TRIM VALUE

ROLL TRIM VALUE

0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 1 1 1 1 1

0 0 0 0 1 1 1 1 0 0 0 0 1

0 0 1 1 0 0 1 1 0 0 1 1 0

0 1 0 1 0 1 0 1 0 1 0 1 0

0.00 0.125 0.25 0.375 0.50 0.625 0.75 0.875 1.00 1.125 1.25 1.375 1.50

1 1 1 1 1 1 1 1 1 1 1 1 1

0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 1 1 1 1 1

0 0 0 0 1 1 1 1 0 0 0 0 1

0 0 1 1 0 0 1 1 0 0 1 1 0

0 1 0 1 0 1 0 1 0 1 0 1 0

-4.00 -3.875 -3.75 -3.625 -3.50 -3.375 -3.25 -3.125 -3.00 -2.875 -2.75 -2.625 -2.50

0"' 0

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1"' 1

1"' 1

1 "' 1

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1 "' 1

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1"' 1

1 "' 1

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2

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2

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TABLE 4-6 ROLL TRIM DATA

RANGE (NM) 5 NM (not used) 10NM 20NM 40NM 80NM 160 NM 240NM 320 NM (not used)

BIT 29

BIT 28

BIT 27

BIT 26

BIT 25

BIT24

0 0 0 0 0 1 1 0

0 0 0 0 1 0 1 0

0 0 0 1 0 0 0 0

0 0 1 0 0 0 0 0

0 1 0 0 0 0 0 0

1 0 0 0 0 0 0 0

TABLE 4-7 RANGE CODES IN CONTROL WORD 2

J. Parity Bit (Bit 32)

UP495246

Bit 32 will be set to render odd parity. The number of logic 1 bits in the word, including the parity bit, will be an odd number.

Page 4-8

MMRDS81 SBH.AA6 Rev 2 Sep/92

RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT TECHNICAL PUBLISHERS

BENDIX/KING RS 811A RADAR SENSOR 4.2.2 ARINC 708 DATA WORD AND ARINC 453 DATA BUS The RS 811 A sends a Weather Data Word and a Maintenance Data Word to the Radar Indicator over the ARINC 453 bus. These are both ARINC 708 serial digital words that contain a sync pulse, 64 bits of data, 256 X 3 bits of processed weather data, and an end of word sync pulse. See Figure 4-3. The first 64 bits of data in the weather data word are essentially an echo of the various ARINC 429 Control Word commands. These incoming ARINC 453 bits are compared in the Indicator for agreement with the Control Words sent previously on the ARINC 429 bus, and a WX FLT is displayed if there is disagreement. A lack of this WX FLT indicates that the Indicator Control Word was correctly received by the RS 811 A Radar Sensor. The first 64 bits of the maintenance data word are used to display fault diagnostics and antenna stabilization information on the Indicator AfT Calibration page. 4.2.2.1 ARINC 453 Characteristics The structure of the ARINC 453 data bus is very different from the ARINC 429 control bus structure. The bit rate of ARINC 453 is much faster than that of ARINC 429 signals, and each bit of an ARINC 453 word is a Manchester biphase level. A logic 1 in this scheme is represented by a positive voltage for one half of the bit time followed by a negative voltage for the second half of the bit time, and a logic 0 is represented by a negative voltage for the first half of the bit time followed by a positive voltage for the second half of the bit time. A zero crossing must occur at the midpoint of each bit. Refer to Figure 4-3. 4.2.2.2 Weather Data Word NOTE: The RDS 81 System uses ARINC 708 data for interfacing the Radar Sensor to the Indicator. The Indicator receives the following data in the ARINC 453 weather data word whenever bit 11 of the ARINC 429 Control Word 2 is a logic 0. Refer to paragraph 4.2.1.2 (C). A. Sync Pulse The beginning of the ARINC 453 word is identified by a sync pulse. This pulse is a bipolar signal that occupies three bit times. Figure 4-4 illustrates the structure and timing of the sync pulse. B. Label (Bits 1 through 8) Bits 1 through 8 of the ARINC 453 weather data word represent the label. This label is an octal 055 (00 101 101) and is similar to the ARINC 429 Control Word labels. C. Control Accept Matrix (Bits 9 and 10) Bits 9 and 10 represent the Indicator which is to accept control of the Radar Sensor. Both of these bits will be a logic 1 when a single Indicator is used. When dual Indicators are used, pin 8 of the first Indicator must be grounded in order to program that Indicator to respond as number one. The control accept codes are shown in Table 4-8. D. Slave Bit (Bit 11) Bit 11, the slave bit, is defined by ARINC 708 as a logic 1 when the system is controlled by a second Indicator and as a logic 1 when the system has only one Indicator. Because two Indicators can control the RDS 81 system, with each having control on alternate scans, bit 11 is not required and is set to a logic 0. E. Spares (Bits 12 and 13)

Bits 12 and 13 are spare bits and may appear in either state. The RS811 A Radar Sensor sets these bits to a logic 0. F. Modes (Bits 14, 15, and 16)

UP495246

Bits 14, 15 and 16 are defined as turbulence alert, weather alert, and anticlutter bits. These bits are not used in the RDS 81 system and may appear at either logic level. They are set to a logic 0 level.

MMRDS81 SBH.AA6 Rev 2 Sep/92

Page 4-9

RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT TECHNICAL PUBLISHERS

BENDIX/KING RS 811A RADAR SENSOR

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MMRDS81 SBH.AB2 Rev 2 Sep/92

Page 6-129

RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT TECHNICAL PUBLISHERS

BENDIX/KING RS 811A RADAR SENSOR

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WIRING TABLE

FIGURE 6-13 PRF TIMER BOARD (Owg. No. 300-Q8196-QOOO, R-1) MMRDS81 SBH.AB2 Rev 2 Sep/92

Page 6-131

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RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT TECHNICAL PUBLISHERS

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MMRDS81 SBH.AB2 Rev 2 Sep/92

-- -------- --- -- - --- - - -- - - - ---- - - --

Page 6-135

RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT TECHNICAL PUBLISHERS

BENDIX/KING RS 811A RADAR SENSOR

NOTES:

r:,1

PRIOR TO POST COATING BOTH SIDES OF P.C. BOARD WITH KPN 016-01040-0000, MASK OFF THE FOLLOWING; ALL MOUNTING AREAS, C1, E1, E2, E3.

2.

AFTER SOLDERING Y1 INTO PADS ON P.C. BOARD, BEND LEADS AS SHOWN.

3.

SECURE WITH RTU ADHESIUE CKPN 016-01082-0000).

4.

CONNECT WIRES PER WIRE CHART.

5.

Y1 IS INCLUDED ONLY ON 200-08390-0000. YELLOW WIRES ARE INCLUDED ONLY ON 200-08390-0001.

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UP495246

*E4 AND E5 WIRES ON 200-08390-0001 ONLY. FIGURE 6-15 OSCILLATOR BOARD (Dwg. No. 300-08390-0000, R-41 MMRDS81 SBH.AB2 Rev 2 Sep/92

Page 6-137

RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT TECHNICAL PUBLISHERS

BENDIX/KING

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FIGURE 6-16 OSCILLATOR SCHEMATIC (Dwg. No. 002-08390-0000, R-1) MMRDS81 SBH.AB2 Rev 2 Sep/92

Page 6-139

I I

_ _ _ _ _j

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RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT TECHNICAL PUBLISHERS

BENDIX/KING RS 811A RADAR SENSOR 200-04163-0001 SYMBOL

PITCH ASSY

PART NUMBER

REV 8

RS 0811A

DESCRIPTION

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MMRDS81 SBH.AB2 Rev 2 Sep/92

1.00

Page 6-141

RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT TECHNICAL PUBLISHERS

BENDIX/KING RS 811A RADAR SENSOR

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SCALE 2: I ITEMS 4+5 OMITTED FOR CLARI"T'1

FIGURE 6-17 PITCH ASSEMBLY (Owg. No. 300-04163-0000, R-0) MMRDS81 SBH.AB2 Rev 2 Sep/92

Page 6-143

REF.

RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT TECHNICAL PUBLISHERS

BENDIX/KING RS 811A RADAR SENSOR 200-05054-0000 200-05054-0001 SYMBOL

TILT MTR ASSY TILT MTR ASSY

PART NUMBER

REV 1 REV 4

RS 0811A RS 0811A

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MMRDS81 SBH.AB2 Rev 2 Sep/92

----- - -- ------ - - - -

2.00 9.00 1.00

150-00042-0000 TUBING SHRINK .187 150-00049-0000 TUBING SHRINK .125 150-00049-0009 TUBING SHRINK .125 150-00180-0002 TBG SPRL DM441B

TILT MTR ASSY TILT MOTOR ASSY

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Page 6-145

RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT TECHNICAL PUBLISHERS

BENDIX/KING RS 811A RADAR SENSOR

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UP495246

4 LEADS FROM 92A APPROXIMATELY 2 in. FROM CONNECTOR.

FIGURE 6-18 TILT MOTOR ASSEMBLY (-0000) (Owg. No. 300-05054-0000, R-2) MMRDS81 SBH.AB2 Rev 2 Sep/92

Page 6-147

RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT TECHNICAL PUBLISHERS

BENDIX/KING RS 811A RADAR SENSOR

057-05369-0002

2 0 0 1

NOTES: 1. 2.

o• DO

STRIP LEADS 0.18 IN TO INSTALL NINE 030-01143-0001. INSTALL WHITE HEATSHRINK TUBE 150-00049-0000 OVER FOUR LEADS FROM B2-A AT 1.0 INCH FROM CONNECTOR.

3.

SPIRAL WRAP 150-00180-0002 ALL WIRES. BUTT SPIRAL WRAP TO HEATSHRINK TUBE.

4.

WRAP ~OINT OF SPIRAL WRAP AND SHRINK TUBING WITH TAPE, 012-01004-0000. WRAP TWICE, AND BETWEEN "Y" OF TUBING.

•o

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KEY LOCATION 030-01058-0000

VIEW INTO FEMALE END OF CONNECTOR SCALE 2: 1

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012-01004-0000 SEE NOTE 4

150-00180-0002 SEE NOTE 3

UP495246

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WIRING CHART FROM TO B2-A RED P12-17 B2-A BLACK P12-17 B2-A GRAY PJ2-11 82-A YELLOW P12-9 B2-B RED P12-16 82-B BLACK PJ2-16 82-B GRAY P12-5 82-B YELLOW P12-10 R 1- 1 WH/GRN P12-15 R1-2 WH/RED P12-14 R1-3 WH/8LK P12-13

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FIGURE 6-19 TILT MOTOR ASSEMBLY (-0001) (Dwg. No. 300-05054-0001, R-4) MMRDS81 SBH.AB2 Rev 2 Sep/92

SEE DETAIL A

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Page 6-149

2 PLS

030-02204-0009 030-01143-0001 (9) SEE NOTE 1 (030-01058-0000 2 PLSl

RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT TECHNICAL PUBLISHERS

BENDIX/KING RS 811A RADAR SENSOR 200-04164-0000 SYMBOL

AZIMUTH DRIVE

PART NUMBER

REV 18

RS 0811A

DESCRIPTION

UP495246

--------------016-01007-0009 LOCTITE 242 016-01278-0007

LUBRICANT

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SCAN MTR ASSY

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MMRDS81 SBH.AB2 Rev 2 Sep/92

Page 6-151

RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT TECHNICAL PUBLISHERS

BENDIX/KING RS 811A RADAR SENSOR

4

REF

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