Watkins-Johnson Company WJ-8718-19/FE User manual

10/83
r
INSTRUCTION MANUAL
FOR
WJ-8718-19/FE HF RECEIVER
This document and subject matter disclosed
herein are proprietary items to which
Watkins- Johnson Company retains the
exclusive right of dissemination,
reproduction, manufacture and sale.
This document is provided to the individual
or using organization for their use alone
in the direct support of the associated
equipment unless permission for further
disclosure is expressly granted in writing.
WATKINS-JOHNSON COMPANY
700 QUINCE ORCHARD ROAD
GAITHERSBURG, MARYLAND 20878

WARNING
This equipment employs dangerous voltages
which may be fatal if contacted. Exercise
extreme caution in working with this
equip ment with any of the protective
covers removed.

]
CUSTOMER SERVICE INFORMATION
EQUIPMENT MALFUNCTIONS
This unit was thoroughly inspected and factory adjusted for optimum performance
prior to shipment. If an apparent malfunction is encountered after installation, verify that the
correct input signals are present at the proper connectors. Prior to taking any corrective
maintenance action or breaking any seals, contact your Watkins-Johnson representative, or the
Watkins-Johnson Company Service Department to prevent the possibility of voiding the terms of
the warranty. Contact the Watkins-Johnson Company via mail, telephone, wire, or cable at:
Watkins-Johnson Company
Company Service Department
700 Quince Orchard Road
Gaithersburg, Maryland 20878-1794
Toll Call: [phone] Ext. 7201
TELEX: 89-8402
TWX: 710-828-0546
TELEFAX: [phone]
EASYLINK: 62928185
If reshipment is necessary, follow the instructions in the following paragraph
(Preparation for Reshipment or Storage). Do not return the equipment until a Return for
Maintenance Authorization
(RMA) number has been obtained from the Watkins-Johnson
Company's Customer Service Department. See Item 10 in the General Terms and Conditions of
Sale paper (WJ Form # WJ-151-X) for more information on equipment returns.
PREPARATION FOR RESHIPMENT OR STORAGE
If the unit must be prepared for reshipment, the packaging method should follow
the pattern established in the original shipment. Use the best packaging materials available to
protect the unit during reshipment or storage. When possible, use the original packing container
and cushioning materials. If the original packing materials are not available, use the following
procedure:
1. Wrap the unit in sturdy paper or plastic.
2. Place the wrapped unit in a strong shipping container and place a
layer of shock-absorbing material (3/4-inch minimum thickness)
around all sides of the unit to provide a firm cushion and to
prevent movement inside the container.

3.
CUSTOMER SERVICE INFORMATION
vvnwnVnanJ0* SemCe' filJ 0ut a11 inf nation on the 5x6
I a? PnwK DISCREPANCY REPORT card (WJ Form # WJC-
QA55-0) that was provided with the original shipment. Also
ensure that the Return for Maintenance Authorization (RMA)
number is recorded on the card. If this card is not available,
attach a tag to the unit containing the following information:
a.
Return for Maintenance Authorization (RMA) number.
b. The Watkins-Johnson Type/Model number of the equipment.
c. Serial number.
d. Date received.
e. Date placed in service.
f. Date of failure.
g. Warranty adjustment requested, yes or no.
h. A brief description of the discrepant conditions,
i. Customer name and return address,
j. Original Purchase Order/Contract number.
4. Thoroughly seal the shipping container and mark it FRAGILE.
5. Ship to:
Watkins-Johnson Company
700 Quince Orchard Road
Gaithersburg, Maryland 20878-1794
U.S.A
When storing the equipment for extended periods, follow the above Dackine
instructions to prevent damage to the equipment. The safe limits for storage environment are:
Temperature: -40 to +70°C
Humidity: less than 95%

WJ-8718-19/FE HF RECEIVER CONTENTS
TABLE OF CONTENTS
SECTION I
GENERAL DESCRIPTION
Paragraph Page
1.1 Electrical Characteristics 1_!
1.2 Mechanical Characteristics ,'..]. 1-2
1.3 Equipment Supplied '/'[ 1_2
1.4 Equipment Required But Not Supplied ]]] 1_3
1.5 Optional Equipment 1_3
1.6 WJ-8718-19/FE HF Receiver Specifications 1-3
SECTION II
INSTALLATION AND OPERATION
2.1 Unpacking and Inspection 2-1
2.2
Preparation for Reshipment and Storage 2-1
2.3 Installation 2-1
2.3.1 Input/Output Connectors 2-1
2.3.1.1 Voltage Selector/Fuse Block and Line Cord Receptacle (FL1J1) 2-2
2.3.1.2 RF Input (A2J1) 2-2
2.3.1.3 Line/Phone Audio Out (J16) 2-2
2.3.1.4 Sync Serial I/O (J14) 2-4
2.3.1.5 Clock Switch (S2) 2-4
2.3.1.6 1 MHz REF (Jll) 2-4
2.3.1.7 Remote Input (232J1) 2-4
2.3.1.8 Monitor Output (232J2) 2-4
2.3.1.9 IF Output (J12) 2-5
2.3.1.10 ISB/FM Audio (J15) 2-5
2.3.1.11 Line Audio Level (Rl) 2-5
2.4 Operation 2-5
2.4.1 Introduction 2-5
2.4.2 Front Panel Controls and Indicators 2-6
!2.4.2.1 Push On/Off Power (SI) 2-5
2.4.2.2 Meter (Ml) 2-6
2.4.2.3 Meter Switch 2-6
2.4.2.4 Scanner Mode Switches 2-6
j2.4.2.5 Detection Mode Switches 2-6
2.4.2.6 Gain Mode Switches 2-6
2.4.2.7 BFO OFS/THRS LVL Display 2-8
2.4.2.8 Fault Indicators 2-8
2.4.2.9 Tuned Frequency Readout 2-8
2.4.2.10 Tune Switches 2-8
^ 2.4.2.11 Tuning Knob 2-8
2.4.2.12 General Purpose Keypad 2-8
iii

C°NTENTS WJ-8718-19/FE HF RECEIVER
IV
TABLE OF CONTENTS (Cont'd)
SECTION II
INSTALLATION AND OPERATION
2.4.2.13 Memory Operations Switches ? o
2.4.2.14 MEM ADRS Display ."!!.'.'!.'.'.'.'!.'!!!!.'.'.'!".'" ° 2-8
2.4.2.15 Bandwidth Select Switches ... -
2.4.2.16 REMOTE/LOCAL Switches ] »
2.4.2.17 RF Gain Control ..'....'/.'.'..'...............' 2-9
2.4.2.18 Phone Level Control
2.4.2.19 PHONES Jack ,, [[['.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'.'. \ 2-9
2.4.3 Local Control Mode ,,, [[,. [\['/...[[[[ 2-9
2.4.3.1 Local/Remote Switches .••!•!!!!!."! 2-9
2.4.3.2 General Purpose Keypad ••!..!!!!!."."! 2-10
2.4.3.3 Receiver Operating Parameters 2-11
2.4.4 Memory Storage and Recall Operations 2-16
2.4.4.1 General ...... 1'° ° °." 2-16
2.4.4.2 Quick Access Memory Channel !!!!!!.".'.'!!!!!! 2-16
2.4.4.3 Accessing Numbered Channels .......!!!!....'. 2-16
2.4.4.4 Memory Examination '.'.'.'.'.'.'.'.'.'.'.'.[ 2-18
2.4.5 Memory Scan Operations ...!.!.!!!! 2-20
2.4.5.1 General !!!!!!! °, '.'.'.".'. 2-20
2.4.5.2 Special Purpose Memory Channels 2-20
2.4.5.3 Threshold Level 2-21
2.4.5.4 Dwell Time ."."!!.'!!!!!!!!.'!!!.'.".".' .!.'!.".*! 2-22
2.4.5.5 Memory Scan Control 2-23
2.4.6
Sector Scan Operation 2-26
2.4.6.1 Sector Scan Frequency Data 2-26
2.4.6.2
Sector Lockout 2-28
2.4.6.3 Sector Scan Receiver Register Data ... 2-29
2.4.7 Special
Function Termination Switch (*) 2-33
2.4.7.1 General 2-33
2.4.7.2 Built In Test Equipment 2-33
2.4.7.3
Special Master Mode 2-35
2.4.7.4 Special Function Display 2-38
2.4.7.5 Erase Memory 2-38
2.4.8 Remote
Operation Via RS-232 Serial Interface 2-38
2.4.8.1 Preparation For Operation 2-38
2.4.8.2 Operation Via RS-232 Interface Bus 2-40
2.4.9 Remote Operation Via Synchronous Serial I/O 2-52
2.4.9.1
Transfer To Receiver (TTR) and Transfer From Receiver (TFR) 2-52
2.4.9.2 Signal Seek: Slew up and Signal Seek: Slew Down 2-52
2.4.9.3 Count Pulses: Slew up and Count Pulses: Slew Down 2-53

WJ-8718-19/FE HF RECEIVER CONTENTS
TABLE OF CONTENTS (Cont'd)
SECTION III
CIRCUIT DESCRIPTION
Paragraph Page
3.1 Introduction 3_1
3.2 General Description 3_1
3.2.1 Input RF Switching Section []]] 3_1
3.2.2 Frequency Extender Section 3_3
3.2.3 RF/IF Conversion Section ..*.. 3.4
3.2.4 IF/Demodulator Section ][ 3.5
3.2.5 Synthesizer Section 3_6
3.2.6 Digital Control Section 3-7
3.2.7 Power Supply Section 3_8
3.3 Functional Theory of Operation 3-9
3.3.1 Input RF Switching Section 3-9
3.3.1.1 Input Switch, FE-A2 3-9
3.3.1.2 RF Filter, A2 ."."." 3-9
3.3.2 Frequency Extender, FE-A1 3-11
3.3.2.1 VHF Preselector/lst LO, FE-A1A1 3-12
3.3.2.2 Input Converter/2nd LO, FE-A1A2 3-12
3.3.3 RF/IF Conversion ." 3-12
3.3.3.1 Input Converter (A3) 3-13
3.3.3.1.1 1st Mixer, A3A1 3-13
3.3.3.1.2 2nd Mixer, A3A2 3-13
3.3.4 IF/Demodulator Section 3-13
3.3.4.1 10.7 MHz Filter Switch (A4A1) 3-13
3.3.4.2 10.7 MHz/455 kHz Converter (A4A2) 3-15
3.3.4.3 455 kHz Filter Switch (A4A3) 3-16
3.3.4.4 AGC Amplifier (A4A6) 3-16
3.3.4.5 455 KHz Ampl/AM Detector (A4A7) 3-16
3.3.4.6 FM/CW/SSB Detector (A4A9) 3-16
3.3.4.7 Audio Amplifier (A4A10) 3-17
3.3.5 Synthesizer Section 3-17
3.3.5.1 1st LO Synthesizer (A5A1) 3-18
3.3.5.2 2nd LO Synthesizer (A5A2) 3-18
3.3.5.3 3rd LO Synthesizer (A5A1) 3-18
3.3.5.4 BFO Synthesizer (A5A3) 3-18
3.3.5.5 Time Base (P/O A5A1) 3-18
3.3.6 Digital Control Section 3-19
3.3.6.1 Synthesizer Interface/Memory(A6Al) 3-19
3.3.6.2 IF Interface(A6A2) 3-19
3.3.6.3 Asynchronous I/O (A6A3) 3-19
3.3.6.4 Serial I/O Buffer (A6A4) 3-19
3.3.6.5 Sync Serial I/O (A6A5) 3-21
3.3.6.6 Front Panel Switch/Encoder (MFP-Al) 3-21
3.3.6.6.1 Front Panel Switchboard (MFP-AlAl) 3-21
3.3.6.6.2 Front Panel Encoder (MFP-A1A2) 3-21

C0NTENTS WJ-8718-19/FE HF RECEIVER
Paragraph
TABLE OF CONTENTS (Cont'd)
SECTION III
CIRCUIT DESCRIPTION
Page
3.3.7 Power Supply Section 3 „.
3.4 Circuit Descriptions * , 21
3.4.1 RF Input Filter (A2) ••••-. -
3.4.2 1st LO Synthesizer (FE-A1 AlAl) " " 3-23
3.4.3 VCO (FE-A1A1A2) !!!!!!!! 3-25
3.4.4 Preselector (FE-A1A1A3) • 3-26
3.4.5 2nd LO Synthesizer (FE-A1A2A1) ....WWW 3-27
3.4.6 2nd Converter (FE-A1A2A2) 3-28
3.4.7 1st Converter (FE-A1A2A3) •-••••
3.4.8 RF Input Switch (FE-A2) 3-30
3.4.8.1 RF Input Switch (FE-A2A1) 3_30
3.4.9 1 MHz Filter (FE-A3)
3.4.10 Input Converter (A3) WWW!! 3-30
3.4.10.1 First Mixer (A3A1) V...........]...]......... 3-30
r 3.4.10.2 Second Mixer (A3A2) 3-32
3.4.11 10.7 MHz Filter Switch (A4A1) .' 3-32
3.4.12 10.7 MHz/455 kHz Converter (A4A2) 3-34
3.4.13 455 MHz Filter Switch (A4A3) W.i 3-36
3.4.14 AGC Amplifier (A4A6) 3-36
3.4.15 455 kHz Amplifier/AM Detector (A4A7) 3-40
3.4.16 FM/CW/SSB
Detector (A4A9) 3-40
3.4.17 Audio Amplifier (A4A10) 3-43
3.4.18 1st and 3rd LO Synthesizer/Time Base (A5A1) 3-46
3.4.18.1
VCO (A5A1A1) 3_46
3.4.18.2 1st and 3rd LO/Time Base (A5A1A2) ."..'.WW'!!!!! 3-46
3.4.19 2nd LO Synthesizer (A5A2) ,3-52
3.4.20 BFO
Synthesizer (A5A3) 3-55
3.4.21
Synthesizer Interface/Memory(A6Al) 3-57
3.4.22 IF Interface (A6A2) 3-6O
3.4.23 Asynchronous I/O (A6A3) 3-62
3.4.24 Serial I/O Buffer (A6A4) !!!! 3-65
3.4.25 Sync Serial Input/Output (A6A5) !!!!!!!!! 3-67
3.4.26 Front Panel Switch Encoder (MFP-Al) 3-69
3.4.26.1 Front Panel Encoder Board (MFP-Al Al) W. 3-69
3.4.26.2 Front Panel Switch Board (MFP-AlA2) WW!! 3-71
VI

WJ-8718-19/FE HF RECEIVER CONTENTS
TABLE OF CONTENTS (Cont'd)
SECTION IV
MAINTENANCE
Paragraph Page
4.1 General 4-1
4.2 Preventive Maintenance 4_1
4.2.1 Visual Inspection !!'.! 4-2
4.2.2 Cleaning WW 4-2
4.2.3 Lubrication 4_2
4.3 Receiver Checkout Procedure W 4-3
4.3.1 General WW!!!.!.!.....! 4-3
4.3.2 Test Equipment Required 4_4
4.3.3 Receiver Checkout Procedure Guideliness 4-4
4.3.4 Module Troubleshooting Procedures 4_16
4.3.4.1 Procedure Guidelines 4_lg
4.3.4.2 RF Filter Testing and Troubleshooting WWW!!!!!!!! 4-17
4.3.4.4 1st LO Synthesizer, FE-A1A1A1,Testing and Troubleshooting...!!'.! 4-18
4.3.4.5 VCO, FE-A1A1A2, Testing and Troubleshooting 4-19
4.3.4.6 Preselector, FE-A1A1A2, Testing and Troubleshooting ..."..* 4-21
4.3.4.7 2nd LO Synthesizer, FE-A1A2A1, Testing and Troubleshooting !! 4-22
4.3.4.8 2nd Converter, FE-A1A2A2, Testing and Troubleshooting 4-23
4.3.4.9 1st Converter, FE-A1A2A3, Testing and Troubleshooting .!! 4-24
4.3.4.10 RF Switch, FE-A2, Testing and Troubleshooting 4-26
4.3.4.11 1
MHz Filter, FE-A3, Testing and Troubleshooting 4-27
4.3.4.12 Input Converter Testing and Troubleshooting 4-27
4.3.4.13 10.7 MHz Filter Switch Testing and Troubleshooting .WW 4-29
4.3.4.14 10.7 MHz/455 kHz Converter Testing and Troubleshooting 4-30
4.3.4.15
455 kHz Filter Switch Testing and Troubleshooting 4-31
4.3.4.16 AGC Testing and Troubleshooting ..." 4-33
4.3.4.17 455 kHz Amplifier/AM Detector Testing and Troubleshooting 4-34
4.3.4.18 FM/CW/SSB Detector Testing and Troubleshooting 4-36
4.3.4.18.1 CW/SSB Detector Checkout Procedure 4-36
4.3.4.18.2 FM Detector Checkout Procedure 4-36
4.3.4.19 Audio Amplifier Testing and Troubleshooting 4-38
4.3.4.20 1st LO Synthesizer Testing and Troubleshooting 4-39
4.3.4.21 2nd LO Synthesizer Testing and Troubleshooting 4-41
4.3.4.22 3rd
LO Synthesizer Testing and Troubleshooting 4-43
4.3.4.23 BFO Synthesizer testing and Troubleshooting 4-44
4.3.4.24 Time Base Testing and Troubleshooting 4-45
4.3.4.25
Synthesizer/Interface Testing and Troubleshooting 4-47
4.3.4.26 IF
Interface Testing and Troubleshooting 4-50
4.3.4.27 Asynchronous I/O Testing and Troubleshooting 4-52
4.3.4.28 Serial I/O
Buffer, A6A4, Testing and Troubleshooting 4-53
4.3.4.29 Sync Serial I/O, A6A5, Testing and Troubleshooting 4-54
4.3.4.30 Front Panel Encoder Bd., MFP-Al,Testing and Troubleshooting 4-55
4.3.4.31 Front Panel Audio Circuits, Testing and Troubleshooting 4-56
Vll

r
CONTENTS WJ-8718-19/FE HF RECEIVER
TABLE OF CONTENTS (Cont'd)
SECTION IV
MAINTENANCE
Paragraph page
4.3.5 Parts Replacement Guidelines 4_57
4.3.5.1 Soldering Techniques WWW'!!!! WW 4-57
4.3.5.2 Component Replacement !!! WW'!.'! W 4-58
4.3.5.3 Realignment 4_5g
4.3.6 Adjustment/Alignment Procedures .'! " 4-59
4.3.6.1 General WWW!!!!!.!!! 4-59
4.3.6.2 Synthesizer Alignment WW 4-59
4.3.6.2.1 1st LO Synthesizer Alignment !!!!!!! 4-59
4.3.6.2.2 2nd LO Synthesizer Alignment (A5A2) 4-60
4.3.6.2.3 2nd LO Filter Adjustment WWW!! 4-63
4.3.6.2.4 3rd LO Synthesizer Alignment WW!!!!!!!!!."" 4-63
4.3.6.2.5 2 MHz Time Base Adjustment WWW!!!!! 4-63
4.3.6.2.6 BFO Synthesizer Alignment ....WWW. 4-64
4.3.6.3 Receiver Alignment ...WWW 4-64
4.3.6.3.1 Input Converter Alignment WW 4-64
4.3.6.3.2 10.7 MHz Filter Switch Adjustment WW WW. WW 4-66
4.3.6.3.3 455 MHz Amplifier/AM Detector Response Alignment 4-67
4.3.6.3.4 455 kHz Amplifier/AM Detector Gain Adjustment 4-69
4.3.6.3.5 FM Discriminator Alignment ' 4.70
4.3.6.3.6 LED Intensity Adjustment ....WW 4-73
4.3.6.4 Frequency Extender Alignment 4-73
4.3.6.4.1 1st LO Synthesizer, FE-A1A1A1, Alignment 4-73
4.3.6.4.2 Preselector, FE-Al Al A3, Alignment 4-74
4.3.6.4.3 2nd LO Synthesizer, FE-A1A2A1, Alignment 4-75
SECTION V
REPLACEMENT PARTS LIST
5.1 Unit Numbering Method 5_1
5.2 Reference Designation Prefi 5-1
5.3 List of Manufacturers 5_1
5.4 Parts List .......WWW 5-5
5.5 Revision Level 5.5
5.6 Type WJ-8718-19/FE HF Receiver WW!!!!!!!!!!!!!!!! 5-6
5.6.1 Type 72640 Power Distribution 5-15
5.6.2 Type 791616-1 RF Filter , 5-17
— 5.6.2.1 Part 280093 30 MHz Low Pass Filter 5-19
i.6.3 Type 791592-8 Input Converter !W 5-21
5.6.3.1 Part 370611-7 1st Mixer, 1st IF , 5-23
5.6.3.2 Part 370646-7 2nd Mixer, 2nd IF 5-25
5.6.4 Type 794278-1 Frequency Extender 5-28
viii

WJ-8718-19/FE HF RECEIVER CONTENTS
TABLE OF CONTENTS (Cont'd)
SECTION V
REPLACEMENT PARTS LIST
Paragraph page
5.6.4.1 Type 794315-1 VHF Preselector/lst LO Assembly 5-30
5.6.4.1.1 Type 370689-1
1st LO Synthesizer 5_32
5.6.4.1.2 Type 370690-1 VCO WW! 5-35
5.6.4.1.3 Type 794274-1 Preselector WWW!!!!!!! 5-38
5.6.4.2 Type 794316-1 Input Converter/2nd LO Assembly ...WW 5-41
5.6.4.2.1 Type 794270-1 2nd Local Oscillator 5-43
5.6.4.2.2 Type 270907-1 2nd LO Converter 5_46
5.6.4.2.3 Type 270901-1 1st Converter 5-48
5.6.4.3 Type 794276-1 RF Input Switch W 5-50
5.6.4.3.1 Type 270935-1 RF Input Switch PW Assembly 5-52
5.6.4.4 Type 794327-1 1 MHz Filter 5-54
5.6.5 Type 791569-1 IF Motherboard !! 5-56
5.6.5.1 Type 791594-6 10.7 MHz Filter Switch !!!!! 5-58
5.6.5.2 Type 794254-1 10.7 MHz/455 kHz Converter !! 5-62
5.6.5.3 Type 791595-9 455 kHz Filter Switch 5-66
5.6.5.6 Type 796175-1 AGC Amplifier 5-69
5.6.5.7 Type 726002-2 455 kHz Amplifier/AM Detector 5-73
5.6.5.8 Type 791599-4 FM, CW, <5c SSB Detector/Audio 5-77
5.6.5.9 Type 7459 Audio Amplifier 5-80
5.6.6 Type 791570-1 Synthesizer Motherboard 5-83
5.6.6.1 Type 791630-1 1st and 3rd LO Synthesizer 5-85
5.6.6.1.1 Type 791629 1st LO VCO Assembly 5-88
5.6.6.1.2 Part 34750 1st LO Voltage Controlled Oscillator 5-90
5.6.6.1.3 Type 791600-1 1st & 3rd LO Synthesizer 5-94
5.6.6.2 Type 791601 2nd LO Synthesizer 5-100
5.6.6.3 Type 791576-1 BFO Synthesizer 5-106
5.6.7 Type 791580-1 I/O Motherboard 5-109
5.6.7.1 Type 794275-X Synthesizer Interface/Memory 5-111
5.6.7.2 Type 796032-1 IF Interface 5-114
5.6.7.3 Type 796037 Asynchronous I/O 5-117
5.6.7.4 Type 794300-1 Serial I/O Buffer 5-120
5.6.7.5 Type 794255-1 Sync Serial I/O 5-122
5.6.8 Type 796013-5 Front Panel Motherboard 5-124
5.6.8.1 Type 796056-1 Front Panel Encode 5-126
5.6.8.2 Type 796057-5 Front Panel Switch Board 5-129
5.6.9 Type 791202-5 Encoder Assembly 5-133
IX

CONTENTS WJ-8718-19/FE HF RECEIVER
TABLE OF CONTENTS (Cont'd)
LIST OF ILLUSTRATIONS
SECTION I
Figure Page
1-1 WJ-8718-19/FE HF Receiver 1_0
SECTION II
2-1 Receiver Rear Panel Input/Output Connectors 2-3
2-2 Receiver Front Panel Controls and Indicators 2-7
2-3 Master/Slave Setup [ 2-36
2-4 Daisy Chain Configuration WW! 2-41
2-5 Byte Structure .WW 2-44
2-6 DTR and DFR Format WWW!!!!!!!!!! 2-54
2-7 TTR Timing W W W W 2-55
2-8 TRF Timing WWW!!!!!!! 2-56
2-9 Signal Seek: SLEW Up Timing WW!!!!!!!!!!!!!!!!!!!! 2-57
2-10 Count Pulses: SLEW Down Timing W! 2-58
SECTION III
3-1 Receiver Overall Block Diagram 3_2
3-2 Input Switching Block Diagram 3_10
3-3 Frequency Extender Block Diagram WW 3-11
3-4 RF/IF Conversion Block Diagram 3_12
3-5 IF/Demodulator Section Block Diagram 3-14
3-6 Synthesizer Section Block Diagram !!! 3-17
3-7 Digital Control Section Block Diagram WWW! 3-20
3-8 Power Supply Section Functional Block Diagram " 3-22
3-9 1st LO Synthesizer Block Diagram "" 3-24
3-10 VCO Block Diagram !!!!!!!! 3-25
3-11 Preselector Block Diagram !!!!!!!!!! 3-26
3-12 2nd LO Synthesizer Block Diagram WW! 3-27
3-13 2nd Converter Block Diagram WW 3-28
3-14 1st Converter Block Diagram ,... 3-29

WJ-8718-19/FE HF RECEIVER CONTENTS
Figure
TABLE OF CONTENTS (Cont'd)
LIST OF ILLUSTRATIONS
SECTION III
Page
3-15 Input Converter Functional Block Diagram 3_31
3-16 10.7 MHz Filter Switch Functional Block Diagram !.!!!!!!!!!! 3-33
3-17 10.7 MHz/455 kHz Converter Functional Block Diagram WWW 3-35
3-18 455 kHz Filter Switch Functional Block Diagram WW 3-37
3-19 AGC Amplifier Functional Block Diagram WWW!!!! 3-38
3-21 455 kHz Amplifier/AM Detector Functional Block Diagram!!."!!!'." 3-41
3-22 FM/CW/SSB Detector Functional Block Diagram WW 3-42
3-23 Audio Amplifier Functional Block Diagram WWW!!!!!! 3-44
3-23 1st LO Functional Block Diagram WWW" 3-47
3-24 2nd LO Functional Block Diagram WWW!!!!!! 3-48
3-25 3rd LO Functional Block Diagram WW!!!!!!!!!!!!! !! 3-49
3-26 !-it-.^->
3-27
3-28
3-29
BFO Functional Block Diagram 3_53
Time Base Circuits Functional Block Diagram!!!!!!!!!!!!!!!!!!!!! 3_56
Synthesizer Interface/Memory Block Diagram ..WWW! 3-58
IF Interface Block Diagram WWW 3-61
3-30 Asynchronous I/O Block Diagram WWW 3-63
3-31 Serial I/O Buffer Block Diagram •••...
3-32 Sync Serial I/O Block Diagram WW .WW 3-68
3-33 Front Panel Encoder Block Diagram ...WWW! 3-70
SECTION IV
4-1 Receiver Checkout Procedure, Test Setup 4_6
4-2 Input Converter Alignment Test Setup 4.55
4-3 10.7 MHz Filter Switch Adjustment, Test Setup WW!! 4-66
4-4 455 kHz Amplifier/AM Detector Response Alignment, Test Setup!.'!! 4-68
4-5 455 kHz Amplifier/AM Detector Response Alignment, Typical Response 4-69
4-6 4^5 kHz Amplifier/AM Detector Gain Adjustment, Test Setup 4-70
4-7 FM Discriminator Alignment, Test Setup 4-72
4-8 FM Discriminator Alignment, Typical Response .WW! 4-72
4-9 Preselector Alignment, Test Setup W! 4-74
xi

CONTENTS WJ-8718-19/FE HF RECEIVER
Figure
TABLE OF CONTENTS (Cont'd)
LIST OF ILLUSTRATIONS
SECTION V
Page
5-1 WJ-8718-19/FE HF Receiver, Front Panel,
Location of Components.... 5_7
5-2 WJ-8718-19/FE HF Receiver, Rear Panel,
Location of Components 5_7
5-3 WJ-8718-19/FE HF Receiver, Top View, ••••••••••••• ........
Location of Components 5_o
5-4 WJ-8718-19/FE
HF Receiver, Bottom View,
Location of Components 5-12
5-5 Type 76240 Power Distribution,
Location of Components 5-16
5-6 Type 791616-1 Input Filter (A2),
Location of Components 5-18
5-7 Part 280093 30 MHz Low Pass Filter (A2A1),
Location of Components 5-20
5-8
Type 791592-8 Input Converter (A3),
Location of Components 5-22
5-9
Part 370611-7 1st Mixer, 1st IF (A3A1),
Location of Components 5-24
5-10 Part 370646-7 2nd Mixer, 2nd IF (A3A2),
Location of Components 5_26
5-11 Type 794278-1 Frequency Extender (FE-A1),
Location of Components 5-29
5-12 Type 794315-1 VHF Preselector/lst LO Assembly (FE-A1A1),
Location of Components 5-31
5-13 Type 370689-1 1st LO Synthesizer (FE-A1A1A1),
Location of Components 5-34
5-14 Type 370690-1 VCO (FE-A1A1A2),
Location of Components 5-37
5-15
Type 794274-1 Preselector (FE-A1A1A3),
Location of Components 5-40
5-16 Type 794316-1 Input Converter/2nd LO Assembly (FE-A1A2),
Location of Components 5-42
5-17 Type 794270-1 2nd Local Oscillator (FR-A1A2A1),
Location of Components 5-45
5-18 Type 270907-1 2nd LO Converter (FE-A1A2A2),
Location of Components 5-47
5-19 Type 270901-1 1st Converter (FE-A1A2A3),
Location of Components 5-49
5-20 Type 794276-1 RF Input Switch (FE-A2),
Location of Components 5-51
5-21 Type 270935-1 RF Input Switch PW Assembly (FE-A2A1),
Location of Components 5-53
-22 Type 794327-1 1 MHz Filter (FE-A3),
Location of Components 5-55
5-23 Type 791569-1 IF Motherboard (A4),
Location of Components 5-57
xn

WJ-8718-19/FE HF RECEIVER CONTENTS
TABLE OF CONTENTS (Cont'd)
LIST OF ILLUSTRATIONS
SECTION V
Figure Page
5-24 Type 791594-6 10.7 MHz Filter Switch (A4A1),
Location of Components 5-59
5-25 Type 794254-1 10.7 MHz/455 kHz Converter(A4A2),
Location of Components 5_65
5-26 Type 791595-9 455 kHz Filter Switch (A4A3),
Location of Components 5-68
5-26 Type 796175-1 AGC Amplifier (A4A6),
Location of Components 5_70
5-27 Type 726002-2 455 kHz Amplifier/AM Detector (A4A7),
Location of Components 5-76
5-28 Type 791599-4 FM, CW, and SSB Detector (A4A9),
Location of Components 5_7g
5-29 Type 7459 Audio Amplifier (A4A10),
Location of Components 5-82
5-30 Type 791570-1 Synthesizer Motherboard (A5),
Location of Components 5_84
5-31 Type 791630-1 1st and 3rd LO Synthesizer/Timebase (A5A1),
Location of Components 5_86
5-32 Type 791629 1st LO VCO Assembly (A5A1A1),
Location of Components 5_89
5-33 Part 34750 1st LO Voltage Controlled Oscillator (A5A1A1A1)", '
Location of Components 5-93
5-34 Type 791600-1 1st and 3rd
LO Synthesizer (A5A1A2),
Location of Components 5-95
5-35 Type 791601 2nd LO Synthesizer (A5A2),
Location of Components 5-101
5-36 Type 791576-1 BFO Synthesizer (A5A3),
Location
of Components 5-107
5-37. Type 791580 I/O Motherboard (A6),
Location of Components 5-110
5-38 Type 794275-X Synthesizer Interface/Memory (A6A1),
Location of Components 5-113
5-39 Type 796032-2 IF Interface (A6A2),
Location of Components 5-116
5-40 Type 796037 Asynchronous I/O (A6A3),
Location of Components 5-119
5-41 Type 794300-1 Serial I/O Buffer (A6A4),
Location of Components 5-121
5-42 Type 794255-1 Sync
Serial I/O (A6A5),
Location of Components 5-123
5-43 Type 796013-5 Front Panel Motherboard (MFP-Al),
Location of Components 5-125
5-44 Type 796056-1 Front Panel Encode (MFP-AlAl),
Location of Components 5-127
XJ11

C0NTENTS WJ-8718-19/FE HF RECEIVER
Figure
5-45
TABLE OF CONTENTS (Cont'd)
LIST OF ILLUSTRATIONS
SECTION V
Page
Type 796057-5 Front Panel Switch Board (MFP-A1A2)
Location of Components ,
5-46 Type 791202-5 Encoder Assembly (MFp"a2)',' °°
Location of Components
5-133
SECTION VI
l'l TYPe lllllt'1 inpUt Filter (A2), Schematic Diagram 380082 6-3
6-2 Type 794278-1 Frequency Extender (FE-A1),
Schematic Diagram 370820
6-3 Type 794315-1 VHF Preselector/lst' LO* AssemblV '(FE-A1A1)'
Schematic Diagram 470632
C6-4 Type 370689-1 1st LO Synthesizer (FE-AIAIAI)'
Schematic Diagram 470466
6-5 Type 370690-1 VCO (FE-A1A1A2)
Schematic Diagram 470470
6-6 Type 794274-1 Preselector (FE-A1A1A3)"
Schematic Diagram 470468
6-7 Type 794316-1 Input Converter/2nd LO Assembly (FE-A1A2)
Schematic Diagram 370706
6-8 Type 794270-1 2nd Local Oscillator' (FE-A1A2 Al) '
Schematic Diagram 470633
6-9 Type 270907-1 2nd LO Converter (FE-A1A2A2)
Schematic Diagram 370819
6-10 Type 270901-1 1st Converter (FE-A1A2A3)'
Schematic Diagram 370818
6-11 Type 794276-1 RF Input Switch (FE-A2)
Schematic Diagram 370701
6-12 Type 794327-1 1 MHz Filter (FE-A3)' """" ° c "
Schematic Diagram 271039 fi 9C-
6-13 Type 791592-1 Input Converter (A3), ••••••••
Schematic Diagram 570202 . fi 97
6-14 Type 791569-1 IF Motherboard (A4) ° ^" ©-•"
Schematic Diagram 570202 fi 9q
6-15 Type 791594-6 10.7 MHz Filter Switch (A4A1)! " " "
Schematic Diagram 480103 fi ?1
6-16 Type 794254-1 10.7 MHz/455 kHz Converter''(A4A2)
r Schematic Diagram 380215 ' fi ^
-17 Type 791595-9 455 kHz Filter Switch (A4A3),"
Schematic Diagram 43561 ' 6_35
xiv
6-11
6-13
6-15
6-17
6-19
6-21
6-23

WJ-8718-19/FE HF RECEIVER CONTENTS
TABLE OF CONTENTS (Cont'd)
LIST OF ILLUSTRATIONS
SECTION VI
Figure Page
6-18 Type 796175-1 AGC Amplifier (A4A6),
Schematic Diagram 43229 6-37
6-19 Type 726002-2 455 kHz Amplifier/AM Detector (A4A7),
Schematic Diagram 570253 6-39
6-20 Type 791599-4 FM, CW 6c SSB Detector (A4A9),
Schematic Diagram 43198 6-41
6-21 Type 7459 Audio Amplifier (A4A10),
Schematic Diagram 43230 6-43
6-22 . Type 791570 Synthesizer Motherboard (A5)
Schematic Diagram 470518 6-45
6-23
Type 791630-1 1st 6c 3rd LO Synthesizer/Time Base (A5A1),
Schematic Diagram 43305 6-47
6-24 Type 791629 1st LO/VCO Assembly (A5A1A1),
Schematic Diagram 51198 6-49
6-25 Type 791600-1 1st 6c 3rd LO Synthesizer (A5A1A2),
Schematic Diagram 61247 (Sheet 1 of 2) 6-51
6-25 Type 791600-1 1st 6c 3rd LO Synthesizer (A5A1A2),
Schematic Diagram 61247 (Sheet 2 of 2) 6-53
6-26 Type 791601 2nd LO Synthesizer (A5A2),
Schematic Diagram 61256 6-55
6-27 Type 791576-1 BFO Synthesizer (A5A3),
Schematic Diagram 51183 6-57
6-28 Type 791580 I/O Motherboard (A6)
Schematic Diagram 470519 6-59
6-29 Type 794275-X Synthesizer Interface (A6A1),
Schematic Diagram 570208 6-61
6-30 Type 796032 IF Interface (A6A2),
Schematic Diagram 570239 6-63
6-31 Type 796037 Asynchronous I/O (A6A3),
Schematic Diagram 470800 6-65
6-32 Type 794300-1 Serial I/O Buffer (A6A4)
Schematic Diagram 470496 6-67
6-33 Type 794255-1 Sync Serial I/O (A6A5)
Schematic Diagram 470455 6-69
6-34 Type 796013-5 Front Panel Motherboard (MFP-A1)
Schematic Diagram 680028 6-71
6-35 Type 796056-1 Front Panel Encode (MFP-A1A1)
Schematic Diagram 680029 6-73
6-36 Type 796057-5 Front Panel Switch Board (MFP-A1A2)
Schematic Diagram 580049 6-75
6-37 WJ-8718-19/FE HF Receiver Main Chassis,
Schematic Diagram 570203 6-79
xv

CONTENTS WJ-8718-19/FE HF RECEIVER
TABLE OF CONTENTS (Cont'd)
LIST OF TABLES
Table
Page
Section I
1-1 Type WJ-8718-19/FE HF Receiver, Specifications 1-4
Section II
2-1 Termination Switches 2-10
2-2 Threshold Data Codes 2-21
2-3 Sector Scan Frequency Data Storage..!!!." »•••..-.
2-4 Group 1 Switch Codes !!!!!!!!!!!!!!!!' 2-34
2-5 Group 2 Switch Codes
2-6 Baud Rate Codes !!!!!!!!!!!!!!!!!!!!!! 2-39
2-7 Switch Assembly (S2) Functions !!!!!!!!!!!!!!!!!!!!!!!!!!!! 2-40
2-8 Receiver Address Codes !!!!!-- 2-40
2-9 RS-232 Connector Pin Ass ignments !!!!!!!!!!!!!!!!!!!!!!!! 2-42
2-10 Receiver Address Byte "° ' ""c '" "' °
2-11 DID Byte !!!!!!! °"'.'.!!'" °!" *" °°° °" °° °'°' u
2-20
2-21
2-46
2-12 Register Parameter Data 2 48
2-13 Tier 2 Access Byte !!!!!!!!!!!!!!!! 2-49
2-14 Tier 2, Page 1 Byte 1!!!!!!!!!!!!!!! ?-4Q
2-15 Tier 2, Page 1 Byte 2 2-49
2-16 Full Status Monitor .!!..!! 2-50
2-17 Bandwidth/Gain/Detection Mode Monitor !!!!!!!!!!!!!!!!!!! 2-50
2-18 Address 15 Receiver Parameters 2-50
2-19 Command Parameters to Address 4 Receiver !!!!!!! 2-50
Full Status Command !!!!!!!!!!,! 2-51
Command BFO Frequency 2-51
2-22 Tier 2 Access Format 2-5i
Section III
3-1 2nd and 3rd IF Bandwidth Selection 3_15
3-2 Detect ion Mode Select ion !!!! ° 3-15
xvi

WJ-8718-19/FE HF RECEIVER OONTENTS
TABLE OF CONTENTS (Cont'd)
LIST OF TABLES
Section IV
Table
Page
4-1 Preventive Maintenance Schedule 4_1
4-2 Test Equipment Required 4_4
4-3 WJ-8718-19/FE Series HF Receiver Checkout Procedure ...!!!!!!!!!!! 4-7
4-4 WJ-8718-19/FE HF Receiver Troubleshooting Procedures 4-11
4-5 1st LO Synthesizer Fault Isolat ion Chart " 4-19
4-6 VCO Fault Isolation Chart !!!!! 4_2o
4-7 Preselector Fault Isolation Chart !!!!!! 4-22
4-8 2nd LO Synthesizer Fault Isolation Chart !!!!!!!!! 4-23
2nd Converter Fault Isolation Chart !!!!!!!! 4-24
1st Converter Fault Isolation Chart !!!!!!!!!! 4-25
Input Converter Fault Isolation Chart !!!!!!!! 4-28
10.7 MHz Filter Switch Fault Isolat ion Chart !!!!!!!!! 4-30
4-13 10.7 MHz/455 kHz Converter Fault Isolat ion Chart !!!!!!!! 4-31
4-14 455 kHz Filter Switch Fault Isolat ion Chart !!!!!!! 4-32
PGZ Fault Isolat ion Chart !!!!!!!!! 4-34
Amplifier/AM Detector Fault Isolat ion Chart !!!!!!!!!!!!! 4-35
FM/CW/SSB Detector Fault Isolat ion Chart !!!!!!!! 4-37
Audio Amplifier Fault Isolation Chart ...
4-19 VCO Band Select ' 7JJ
4-20 1st l£) Frequency Chart
1st LO VCO Fault Isolat ion Chart !!!!!!!!!!!!!!!!!!!! 4-41
32 MHz Loop Fault Isolat ion Chart !!!!!!!!!!! 4-42
Programmable Loop Fault Isolat ion Chart !!!!!!!!!! 4-42
Oit put Loop Fault Isolat ion Chart !!!!!!!!! 4-43
3rd LO Fault Isolation Chart
BFO Fault Isolation Chart !!!!!!!!!!!!!!!!! 4-45
Time Base Frequency Chart !!!!!!!!!!!! 4-46
Microcontroller Input Signal Check !!!!!!!!!!!!! 4-47
Microcontroller Bus Activity Check .............
cpu i/o signal check !!!!!!!!!!!!!!!!!!! 4-48
Synthesizer Interface Frequency Outputs !!!!!!!!!!! 4-49
IF Interface Control Signal/Data Activity Check !!!! 4-50
IF Interface Voltage Table !!!! 4-51
UART Control Signal/Data Activity Check..!!!!!!!!!!! " 4_52
I/O Signal Activity Check !!!!!!!!!!! 4-53
Data Signal Activity Check !!!!!!!!!!!!!!! 4-54
Signal/Data Activity Check !!!!!!!!!!!!!! 4-55
VCO Alignment Parameters !!!!!!!!!!!!! 4-59
Loop Test Point Voltages !!!!!!!!!!!!!!!!!!! 4-62
2nd LO Synthesizer Tuning Parameters !!!!!!!!! 4-62
4-9
4-10
4-11
4-12
4-15
4-16
4-17
4-18
4-41
4-22
4-23
4-24
4-25
4-26
4-27
4-28
4-29
4-30
4-31
4-32
4-33
4-34
4-35
4-36
4-37
4-38
4-39
4-40
xvii

GENERAL DESCRIPTION
r
WJ-8718-19/FE HF RECEIVER
Figure 1-1. WJ-8718-19/FE HF Receiver
1-0