Watkins Johnson WJ-87 18-17 Instruction Manual Download Page 324

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Summary of Contents for WJ-87 18-17

Page 1: ... r I i I I I 1 i be i I I _ l t l r 11 J_ T f r 1 f l f lL j I n t I t t I INSTRUCTION MANUAL 1 FOR t Cl WJ 8718 17 HF RECEIVER i tt l J I I I I I c l i I t I H I Courtesy of http BlackRadios terryo org ...

Page 2: ...isclosed herein are proprietary items to which atkins Johnson Company retains the exclusiYe right of dissemination reproduction manufacture and sale This document is provided to the indiYidual or using organization for their use alone in the direct support of the associated equipment unless per mission for further disclosure is expressly granted in writing WATKINS JOHNSON COMPANY 700 QUINCE ORCHAR...

Page 3: ...ut of the microprocessor U1 pin 5 on MFP A3 The software associated with U25 and U26 of Synthesizer Interface MFP A4 has been modified to include a program step during scanning operation in which the DC voltage level at U1 pin 5 is detected If a level of a Vdc TTL low is detected at pin 5 scanning is not interrupted If a level level of 5 V TTL Ilhighll is detected at pin 5 the receiver stops scann...

Page 4: ...ination 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 20760 Revision V 01 80 500 Courtesy of http BlackRadios terryo org ...

Page 5: ...otective covers removed I C_A_U_T_I_O_N_I Leakage of the Nickel Cadmium battery A6AlBT1 supplied with Type 791575 Manual Tuning Up Down Counter A6Al has been reported and the probable causes are being investigated If the battery is in stalled it should be removed to prevent possible damage to the equipment from corrosion Courtesy of http BlackRadios terryo org ...

Page 6: ...t and Storage InstalIation Voltage Selector Fuse Block and Line Card Receptacle F1J1 RF Input A2J1 Alternate Fuseholder XF2 IF Output J12 Terminal Board TB1 Terminal Board TB2 Line Audio Level R1 Clock Switch S2 1 MHz Ref Jll Phones Jack J13 Remote Input Option A6A1J1 Operation Push On Off Power Sl Meter M1 Meter Switches Gain Mode RF Gain Control Detection Mode IF Bandwidth kHz BFO Offset Tuned F...

Page 7: ...ype 791597 ISB LSB Filter Switch Option A4A5 Revision E Type 72488 455 kHz Amplifier AM Detector A4A7 Type 78112 AGC A4A6 Type 791599 FM CW SSB Detector A4A9 Type 7459 Audio Amplifier A4A10 Type 791598 ISB Detector Audio Option A4A8 Synthesizer Section Synthesizer Relationships Phase Lock Loops General Basic Phase Lock Loop Phase Lock Loop Prescaling Technique Phase Detector Type 791600 Time Base ...

Page 8: ...Control Section Type 791575 2 Manual Tuning Up Down Counter A6A1 Integrated Circuit Data Circuit Description Type 791828 Front Panel Interconnect A6A2 Type 791874 1 Manual Tuning Module A7 Type 791589 Tuning Resolution A7A1 Encoder Assembly A7U1 Type 791578 Frequency pisp ay A8 Type 791588 BFO Switch A9 Type 791684 Front Panel Control A10 Type 791583 Upper Panel Control A10A Type 791826 Lower Pane...

Page 9: ...bleshooting Input Converter Checkout Procedure Input Converter Fault Isolation 10 7 MHz Filter Switch Testing and Troubleshooting 10 7 MHz Filter Switch Checkout Procedure 10 7 MHz Filter Switch Fault Isolation 10 7 MHz Filter Switch Fault Isolation Revision E 10 7 MHz 455 kHz Converter Testing and Troubleshooting 10 7 MHz 455 kHz Converter Checkout Procedure 10 7 MHz 455 kHz Converter Fault Isola...

Page 10: ...eckout Procedure Front Panel Interconnect Fault Isolation Lower Panel Control Testing and Troubleshooting Lower Panel Control Checkout Procedure Lower Panel Control Fault Isolation 1st LO Synthesizer Testing and Troubleshooting 1st LO Synthesizer Checkout Procedure 1st LO Synthesizer Fault Isolation 1st LO Synthesizer Supplementary Troubleshooting Data 2nd LO Synthesizer Testing and Troubleshootin...

Page 11: ... Adjustment Revision E 455 kHz Amplifier AM Detector Response Alignment 455 kHz Amplifier AM Detector Gain Adjustment USB Filter Switch and ISB LSB Filter Switch Adjustment USB Filter Switch and ISB LSB Filter Adjustment ISB Detector Audio Adjustment FM Discriminator Alignment LED Intensity Adjustment SECTION V REPLACEMENT PARTS LIST Unit Numbering Method Reference Designation Prefix List of Manuf...

Page 12: ...791598 ISB Detector Audio A4A8 Type 791599 FM CW and SSB Detector A4A9 Type 7459 Audio Amplifier A4A10 Type 791570 Synthesizer Motherboard A5 Type 791630 1st and 3rd LO Synthesizer Time Base A5A1 Type 791629 1st LO VCO Assembly A5A1A1 Part 34750 1st LO Voltage Controlled Oscillator A5A1A1A1 Type 791600 1st and 3rd LO Synthesizer A5A1A2 Type 791601 2nd LO Synthesizer A5A2 Type 791576 BFO Synthesize...

Page 13: ...nt Termination VCO Functional Block Diagram Digital Section Functional Block Diagram Manual Tuning Up Down Counter Block Diagram Up Down Counter Integrated Circuit Data Front Panel Interconnect Integrated Circuit Data Encoder Assembly Timing Diagram Corrective Maintenance Flowchart Corrective Maintenance Flowchart Corrective Maintenance Flowchart IF Gain and Bandwidth Performance Test Setup SIN Ra...

Page 14: ...Components Part 280093 30 MHz Low Pass Filter Product Improvement A2A1 Location of Components Type 791592 1 Input Converter A3 Part 34748 1st Mixer 1st IF A3A1 Part 34749 2nd Mixer 2nd IF Amplifier A3A2 Part 280080 Filter Board A3A3 Location of Components Type 791569 IF Motherboard A4 Location of Components Type 791594 10 7 MHz Filter Switch A4A1 Location of Components Type 791594 10 7 MHz Filter ...

Page 15: ...BFO Switch A9 Location of Components Type 791684 2 Front Panel Control A10 Location of Components Type 791583 Upper Panel Control A10A1 Location of Components Type 791826 Lower Panel Control A10A2 Location of Components Type 791616 RF Filter A2 Schematic Diagram 34437 Type 791616 Input Filter A2 SChematic Diagram 380082 Type 791592 Input Converter A3 Schematic Diagram 51178 Type 791594 10 7 MHz Fi...

Page 16: ... 8718 HF Receiver Main Chassis Schematic Diagram 580032 Sheet 2 of 6 and Sheet 3 of 6 Type WJ 8718 HF Receiver Main Chassis Schematic Diagram 580032 Sheet 4 of 6 and Sheet 6 of 6 LIST OF TABLES 6 23 6 25 6 27 6 29 6 31 6 33 6 35 6 37 6 39 6 41 6 43 6 45 1 1 2 1 3 1 3 2 3 3 3 4 3 5 3 6 3 7 3 8 3 9 3 10 3 11 4 1 4 2 4 3 4 4 4 5 Type WJ 8718 HF Receiver Specifications Remote Input Lines Identificatio...

Page 17: ...er Switch Voltage Table 455 kHz Amplifier AM Detector Voltage Table FM CW SSB Detector Voltage Table Audio Amplifier Voltage Table ISB Detector Audio Voltage Table AGC Voltage Table Front Panel Interconnect Voltage Table VCO Band Select Code 1st La Frequency Chart 2nd La Frequency Chart BFa Frequency Chart Output Divider U10 Frequency Chart Time Base Frequency Chart VCO Alignment Parameters Loop T...

Page 18: ...WJ 8718 HF RECEIVER THIS PAGE LEFT BLANK CONTENTS xv Courtesy of http BlackRadios terryo org ...

Page 19: ...Page 3 51 Paragraph 3 4 9 4th line change Figure 6 20 to Figure 6 21 6 Page 3 51 Paragraph 3 4 10 2nd line change Figure 6 20 to Figure 6 21 7 Page 4 56 Paragraph 4 7 16 2 item 1 change Figure 6 13 to Figure 6 23 8 Section V Replacement Parts List page 5 52 Paragraph 5 5 5 TYPE 791570 SYNTHESIZER MOTHERBOARD add listing for VI and V2 Integrated Circuits Part no 7805 DC Mfr Code 07263 9 Section V R...

Page 20: ...Page 2 of 2 Cl THRU C29 C30THRU C58 January 29 1980 Courtesy of http BlackRadios terryo org ...

Page 21: ...agraph B below for fault isolation information 1 Disconnect A2Pl from A3AlJl on the Input Converter A3 2 Connect the Signal Generator RF output to A2Jl on the receiver rear panel Set the Signal Generator output frequency to 1 0 MHz and output level to 0 dBm 3 Connect the RF Voltmeter and 50 Q adapter to A2Pl Set the RF voltmeter to the 0 dBm range 4 The RF Voltmeter should indicate between 0 and 2...

Page 22: ...pment to the receiver as shown in Figure 1 3 Set up the Sweep Generator as follows a Power ON b CW Sweep SYM c Trig Line Free Line d Fast Slow Manual Fast e Crystal Cal Off f Range 110 g Sym Sweep Width 10 MHz Vernier h 1 kHz Mod Off i Output Level 10 dBm j Frequency 20 MHz 4 Set the Marker Generator for a 30 MHz output unmodulated at 10 dBm 5 Adjust Ll L2 L3 IA and L5 for minimum insertion loss a...

Page 23: ...ADDENDUM I SIGNAL GENERATOR RF OUT HF RECEIVER A2J1 A2Pl OSCILLOSCOPE VERT IN HOR IN SWEEP GENERATOR SWEEP RF OUT OUT 2 1 SUMMER Figure 1 Test Setup RF Input Filter Alignment Courtesy of http BlackRadios terryo org ...

Page 24: ... Change Ll from 470 p H to 1 0 mH 2500 18 Vendor 99800 Change R23 from 2k Q to 500 Q 62PR500 Vendor 73138 Change R24 from 220 Q to 100 Q RCR07GlOIJ8 Vendor 81349 4 791597 ISB LSB Filter Switch A4A5 Schematic Diagram 480105 Change C6 from 270 pF to 0 1 p F 34475 1 Vendor 14632 Change Ll from 470 p H to 1 0 mH 2500 18 Vendor 99800 Change R32 from 2k Q to 500 Q 62PR500 Vendor 73138 Change R5 from 220...

Page 25: ...ic Diagram 61256 Change C59 from 22pF to 33pF 308 000COGO 330J Vendor 72982 Change C66 from 5 6pF to 2 7pF 301 000COJO 279C Vendor 72982 Change C67 from 6 8pF to 5 6pF 301 00U2JO 569D Vendor 72982 9 791575 Manual Tuning Up Down Counter A6Al Schematic Diagram 51180 Change R4 from lk Q to 10k Q RCR07G103JS Vendor 81349 10 791598 ISB Detector Audio A4A8 Schematic Diagram 43231 Change R58 and R59 from...

Page 26: ...scribed in the Recommended Procedure given below If no evidence of corrosion is discovered battery A6AlBTl may be left intact on the Manual Tuning Up Down Counter It is recommended that periodic inspection of battery A6AlBTI and surrounding surfaces be made to preclude any damage to receiver components as a result of leakage and or corrosion RECOMMENDED PROCEDURE 1 Using Figure 1 locate and remove...

Page 27: ...NDUM III CUT LEAD BATTERY PIN K02A11ASP1 ASSEMBLY A6A ASSEMBLY A6A1 UNSOLDER CONNECTIONS FROM REAR OF ASSEMBLY DataSentry BATTERY MODEL No DS25D Figure I Battery A6AlBTI Removal Courtesy of http BlackRadios terryo org ...

Page 28: ... PROCEDURE Follow the general requirements for test and alignment procedures as outlined in the WJ 8718 Instruction Manual and proceed as follows 1 Energize the receiver and tune to 15 00499 MHz 2 Connect a DVM to test point El or module pin B57 on type 791570 Synthesizer Motherboard AS and adjust C51 for a 3 0 Vdc reading 3 Connect a DVM to test point E3 or module pin A5l on type 791570 Synthesiz...

Page 29: ...ted by thirty two 32 times any 1 MHz time base error counter or receiver time base e g if the 1 MHz output is read as 1 000001 then the reading in performance test step 2 will be 32 21000 MHz 32 Hz or 32 21003 MHz Courtesy of http BlackRadios terryo org ...

Page 30: ... s neces sitated a change of value for R64 from 10 to 3 3 and the addition of heat sink RAI to re gulator VRI on the 1st and 3rd LO Synthesizer N8292A IC s which have functioned properly for more than six 6 months in WJ 8718 HF Receivers should continue to do so therefore no wholesale replacement of the N8292A IC s is necessary N8292A IC s used on the 1st and 3rd LO Synthesizer should only be repl...

Page 31: ...allation nickel cadmium sealed cells may be checked as follows Measure the open circuit voltage If the measurement is equal to or greater than one volt the cell is acceptable If the voltage is less than one volt the cell may be de fective or inadvertently shorted down during shipping or handling To determine if the cell is defective follow the procedures below 1 Apply a charge voltage of 5V throug...

Page 32: ...strates installation procedures As an option a field modification kit WJ S71S BAT is available which will provide for mounting the battery and a switch on the rear panel MONITOR OUTPUT position If problems or questions arise about battery installation or the WJ 871S BAT option contact your local Watkins Johnson Field Sales Office or the CEI Division directly SOLDER BATTERY PIN K02AllASP1 ASSEMBLY ...

Page 33: ...ard wiring to the I O connector used in the WJ 8716 and WJ 8718 series HF Receivers INDUSTRY STANDARD WIRING TO PLUG RECEIVER STANDARD WIRING TO PLUG Mfg Port No 609 37S 19 0 20 0 37 0 0 0 0 19 o o o 37 o o o 20 Used on MCM 2 COM and B 18 Options Courtesy of http BlackRadios terryo org ...

Page 34: ...have proven the modification results in a noise reduction of 20 dB or more NEW PARTS REQUIRED l each Resistor RFC 470 n 5 1 4 W Part No RCR07G471JS MFR Code 81349 Capacitor Mica Dipped 2700 pF 2 500 V Part No CM06FD272G03 MFR Code 71279 Capacitor Electrolytic Tantalum 18 jJF 10 20 V Part No 196D186X9020KE3 MFR Code 56289 MODIFICATION INSTRUCTIONS 1 Locate and remove the Type 791599 FM CW and SSB D...

Page 35: ...pF on the Type 791599 FM CW SSB Detector with the 2700 pF capacitor described in paragraph 1 2 1 below 3 Replace capacitor C13 47 jJF on the Type 791599 FM CW SSB Detector with the 18 jJF capacitor described in paragraph 1 2 1 below 1 1 MODIFICATION RESULTS Tests have proven the modification results in a noise level reduction of 20 dB at the front panel phones jack line audio output 1 2 MANUAL CHA...

Page 36: ...1349 To C17 Capacitor Mica Dipped 2700 pF 2 500 V Part No CM06FD272G03 MFR Code 81349 5 From C13 Same as Cl To C13 Capacitor Electrolytic Tantalum 18 IF 10 20 V QTY 1 Part No 196D186X9020KE3 MFR Code 56289 6 Change Cl QTY 9 to Cl QTY 8 1 2 2 Location of Components Diagram Figure 5 20 Type 791599 FM CW and SSB Detector A4A9 1 Delete L2 and add R39 as shown To Courtesy of http BlackRadios terryo org...

Page 37: ... VIII 1 2 3 Schematic Diagram Figure 6 11 Type 791599 FM CW and SSB Detector A4A9 1 Delete L2 add R39 and change C17 as shown Cl7 Ie700tF To Ft 0 f 2 Change C13 as shown To 3 f 7 I c S 8 r I 0 I Courtesy of http BlackRadios terryo org ...

Page 38: ... a ribbon cable to terminals E1 through E40 as illustrated below CV D J I u J U3 1 c c 1 c r c r T RIJ E40 V I Ut J us 1 UI u I u 7 R4 c r 5 c r 1i4l e O C RSo i t I n I 2 Figure 6 19 Type 791575 2 A6A1 schematic diagram should be corrected to as shown below a Change connection of REM FREQ LOAD line as shown below FROM f r E 2 l I To J r PE I 4 and U7 to 10 45 000 5 6 8 AbO 2 2 on the Q outputs of...

Page 39: ...ll A4A1 Inject Signal 3 at W16P28 1I REFER TO CORRECTED ILLUSTRATION BELOW TROUBLESHOOT MAN TROUBLESHOOT TUNING UP DOWN INPUT CONVERTER COU JT E R PARA 47 5 I YES IS 3RD LO TROUBLESHOOT NO 6 dbm 0112 VRMS 3RD LO AT 11 155 MHc PARA 4 720 ATW6rl0 IS IF OUTPUT 21 dbm 12 dbm FOR ALL BW SETT INGS YES RECONNECT WI6P28 INJECT SIGNAL 5 AT A31Jl REINSTALL A4Al INJECT SIGNAL 3 AT W 6P28 IS IF OUTPUT 21 dbm ...

Page 40: ...FIGURE 1 1 WJ 8718 HF RECEIVER 1 0 Figure 1 1 WJ 8718 HF Receiver Courtesy of http BlackRadios terryo org ...

Page 41: ... selection is ineffective due to the automatic override by the detection mode control RF gain may be controlled manually or by Fast or Slow AGC A dual purpose meter indicates Signal Strength or Line Audio level Internal frequency tuning circuitry of the basic receiver includes the 1st 2nd and 3rd LO Synthesizers and a BFO Synthesizer The phase lock loop frequency synthesizers determine tuned frequ...

Page 42: ...o mounted on the front panel The rear panel mounts all input output and accessories with the exception of the above mentioned phones jack BNC connectors are supplied for the RF input IF output and 1 MHz reference input output The INT EXT clock switch for selecting internal or external timebase reference is located next to the 1 MHz reference input output Two terminal blocks supply an output for Li...

Page 43: ...anual for definitions of the input lines 6 Two extender cards are required available from Watkins Johnson for troubleshooting to the component level 1 5 OPTIONAL EQUIPMENT The following optional equipment is available for use with the WJ 8718 HF Receiver For additional information concerning these options and others contact Watkins Johnson Company Gaithersburg Maryland or your Watkins Johnson repr...

Page 44: ...18 MFP 13 RS 232 Interface Talk Listen WJ 8718 232 14 1 Hz Tuning WJ 8718 l Hz 15 Carrier Operated Relay WJ 8718 COR Note Either MCM or MCM 2 is required with main frame for receiver operation Note Independent Sideband ISB option provides selectable ISB LSB and USB functions 1 4 Courtesy of http BlackRadios terryo org ...

Page 45: ...m Frequency Display 7 digit LED s Frequency Resolution Readout 10 HZ 8 6 Frequency Stability 6 x 10 per day 2 x 10 per year Frequency Control Manual or Remote options Synthesizer Lock Up Time 3 ms typical 10 ms maximum Synthesized BFO 455 kHz 8 9 kHz in 100 Hz steps Power Interrupt With the Manual Control Module option storage of the frequency data will auto matically occur Upon restoration of pow...

Page 46: ... dB S N N ratio at the audio output 100 mW maximum across 600 Q 2 W minimum across 600 Q for an input signal of 3 llV 30 AM modulated at a 400 Hz ratio 30 mW minimum for an input signal of 3 llV 30 AM modulated at a 400 Hz rate Less than 5 at rated audio output 1 5 dB from 100 Hz to 8 kHZ 1 kHz reference frequency 20 mY minimum into 50 Q for input signals greater than 3 0 llV 20 dBm minimum for si...

Page 47: ...s high 19 inches wide and 19 4 inches deep Weight 35 pounds 15 75 kilograms approximately Note The stereo headphone output will provide 30 mW for each sideband in the ISB mode USB output available on the stereo phone tip LSB output available on stereo phone ring 1 7 Courtesy of http BlackRadios terryo org ...

Page 48: ...6 1 1 00 INCH 2 54 CM 5 22 1 56 Hl II 2 15 50 14 84 5 44 4 00 5 00 14 62 1 19 00 1 I 1 75 T 19 18 12 19 I 1 50 I U U 9 00 9 91 4 38 1 16 88 11 06 Figure 2 1 WJ 8718 Receiver Critical Dimensions 2 0 Courtesy of http BlackRadios terryo org ...

Page 49: ... RESHIPMENT AND STORAGE If the WJ 8718 must be prepared for reshipment the packaging methods should follow the pattern established in the original shipment If retained the original materials can be reused to a large extent or will at a minimum provide guidance for the repackaging effort Conditions during storage and shipment should normally be limited as follows Maximum humidity 95 no condensation...

Page 50: ...P21 JI3 MP6 MP4 MP5 MPI4 MPI5 MPI6 MPI7 MPI8 MPI2 MPI9 Figure 2 2 WJ 8718 HF Receiver Front Panel View DENOTES HIDDEN PART5 MP22 U3 RA3 TBI JI2 TB2 RI CR21t RA2 U2 RAI UI MP23 JII 52 XF2 F2 CRI FI 2 2 Figure 2 3 WJ 8718 HF Receiver Rear Panel View Courtesy of http BlackRadios terryo org ...

Page 51: ...er the fuse and PC wafer portion of the assembly holder and insert the line cord in the receptacle 2 3 2 RF INPUT A2J1 This BNC connector is the RF signal input for the receiver Nominal input impedance is 50 Q The input is protected against signals exceeding 15 dBm 1 25 V rms and static build up 2 3 3 ALTERNATE FUSEHOLDER XF2 This fuseholder provides convenient storage of the fuse for the line vol...

Page 52: ...put at J1l Setting this switch to the EXT position deactivates the internal reference so that an external signal may be applied to J1l 2 3 9 1 MHz REF Jll When the CLOCK switch is in the INT position this BNC connector provides a 1 MHz 100 mV rms output into 50 Q When the switch is set in the EXT position a 1 MHz reference signal of at least 50 mV rms into 50 G must be applied to Jll to provide a ...

Page 53: ...3 Pin 32 E30 Pin 14 E38 2 Pin 18 E37 2 0 Pin 36 10 2 E34 1 3 Pin 16 E33 Pin 34 E35 2 Pin 35 E26 2 0 Pin l2 10 3 E13 1 3 Pin 24 E14 Pin 6 E25 2 Pin 30 E22 2 0 Pin lO 10 4 E18 1 3 Pin 8 E17 Pin 26 E21 2 Pin 28 E10 2 0 Pin 4 10 5 E08 1 3 Pin 3 E04 Pin 1 E09 2 Pin 22 E06 2 0 Pin 2 10 6 El1 1 3 Pin 23 E15 Pin 25 E5 2 Pin 20 E36 2 0 Pin 17 10 7 E40 2 1 Pin 19 E7 Pin 21 Load E19 Pin 27 E23 Pin 29 Ground ...

Page 54: ...rength in the MAN gain mode The other scale on the meter indicates the audio level of the LINE AUDIO output in dB above 1 mW referenced to 600 Q 2 4 3 METER SWITCHES The two switches LINE AUDIO and SIGNAL STRENGTH determine what function the meter will indicate Both of these functions are explained below 1 LINE AUDIO With this switch engaged the rear panel LINE AUDIO terminals can be set for 0 to ...

Page 55: ...and front panel PHONES audio are taken from the CW SSB product detector in this mode 4 USB MODE Option Selection of this mode overrides the front panel IF bandwidth switches and activates the independent IF filter for upper sideband reception Audio will be available at the front panel PHONES jack and at the AUDIO LINE ter minals and PHONE AUDIO terminals of TBI on the rear panel The BFO is enabled...

Page 56: ...t including the Manual Tuning Module remote inputs on the rear panel establish tuned frequency For these remote control receivers the IF bandwidths may also be selected from the remote location 1 TUNING KNOB Rotating the knob clockwise increases tuned frequency counterclockwise rotation decreases tuned fre quency Continuing to tune past the end of the range causes the receiver to step to the oppos...

Page 57: ... All others are available for tuning 6 10 Hz BUTTON With this button engaged all digits are available for tuning PHONE LEVEL CONTROL Rotating the front panel PHONE LEVEL control clockwise increases the output of both the PHONE AUDIO terminals at TB2 and the stereo PHONES jack on the front panel 2 9 Courtesy of http BlackRadios terryo org ...

Page 58: ...INSTALLATION AND OPERATION THIS PAGE LEFT BLANK 2 10 WJ 8718 HF RECEIVER Courtesy of http BlackRadios terryo org ...

Page 59: ...G VOL T REG JI5 30 MHz LOW PASS J32 F11 10V UN REG en J31 I II L l _t A4TPI61 l A r 5TPI4 II I i ISB LSB PHONE r t T 1T AUDIO A5T P A _I A 2 L z_ T r AJ t i I I 2ND LO liST LO TIME LO AND I 3RD LO A5A3 I I SYNTHESIZER I SYNTHESIZER BASE TIME SYNTHESIZER r BFO I II I BASE I SYNTHESIZER I I r t t 1 11 1 I SB L IN E A U D 10 TB2 I l I r L l i t i 1 1 I I r7MANuALTLiN NG l MANU AL i i rtJ P 1 I A7UI T...

Page 60: ...PAS S I 28 KHz BW 16 KHz BW I I 6K BW WIDE DETECTOR A4AIO G A 2 I WIDE A4A3 A 4A 7 10 I I I A4AI METER I I I SWITCH _ J AIOAI L_ I USB 4 FI L T ER f 4 FM CW I j I SW ITCH SSB AGC A4A4 DETECTOR I A4A6 I A4A9 r t I I ISB LSB I I I L t FI L TER I SW ITCH I A4A 5 I I I I I SB DETECTOR I I I AND PHONE I 1ST LO 2ND LO I AUDIO AUDIO PHONE AUDIO NO I A4A8 AMP I I PH ONE AUDIO NO 2 AIOA2 L_ __ __ J ISB LIN...

Page 61: ... kHz and 16 kHz and demodulators for AM FM and CW signals Sideband reception ISB LSB and USB is available as an option Tuning is in discrete 10 Hz steps locked by frequency synthesizers to an internal or external frequency standard for accuracy and stability The power supply section provides regulated voltages of 15 V 15 V and 5 V 3 2 RECEIVER SECTION 3 2 1 FUNCTION AL DESCRIPTION Refer to the rec...

Page 62: ...nator portion of the FM CW SSB Detector energizes and receives an amplified 455 kHz signal from the 455 kHz Amplifier FM audio then passes through the Audio Amplifier as well as the Phone Level and Line Audio Level controls In the CW mode and optional USB and LSB modes the BFO and the product detector portion of the FM CW SSB Detector are enabled and use the amplified 455 kHz signal as indicated i...

Page 63: ...e which might exist at the RF input The values of inductors and capacitors are critical to the filter performance and close tolerance parts are used Care must be taken if it becomes necessary to open the RF Filter enclosure since the physical orientation of the parts particularly the inductors affect both its passband and stopband response 3 2 3 TYPE 791592 INPUT CONVERTER A3 All signals entering ...

Page 64: ...ttenuation improves the image rejection and reduces the conducted LO leak age of the receiver Over the range of LO and image frequencies the attenuation of the in put filter exceeds 80 dB Resistor Rl provides a dc path to ground to bleed off any accumu 1ated static charge at the RF input Diodes CRl through CR4 use the Zener breakdown po tential to protect the rest of the receiver from input signal...

Page 65: ...WJ 8718 HF RECEIVER THIS PAGE LEFT BLANK CIRCUIT DESCRIPTION 3 3b Courtesy of http BlackRadios terryo org ...

Page 66: ...vely low harmonic content in the 2nd LO signal The 2nd Mixer is followed by a bipolar cascode amplifier It consists of common emitter stage A2Q4 and common base stage A2Q3 These provide relatively high gain with good stability and low noise contribution Transformer A2T2 couples the output of A2Q3 to crystal filter A2FLl This filter has a center frequency of 10 7 MHz a bandwidth of 16 kHz and requi...

Page 67: ...These lines are connected to the non inverting in puts of UlA urn and U2A The inverting inputs are held at approximately 0 8 V by voltage divider R52 R53 The output voltage of the selected op amp swings positive turning on one pair of common emitter IF amplifier stages For example if UlA is selected Ql and Q4 are turned on The 10 7 MHz IF signal is input at pin 13 and coupled through Cl to the bas...

Page 68: ...CIRCUIT DESCRIPTION 3 4b THIS PAGE LEFT BLANK W 8718 HF RECEIVER Courtesy of http BlackRadios terryo org ...

Page 69: ...th some unbypassed emitter resistance to stabilize its gain and reduce distortion The pi network C7 L2 C8 serves as an impedance transformer and low pass filter further reducing distortion of the LO signal Low pass filter C9 L3 C10 L4 and Cll filters out undesired components above 500 kHz from the mixer output and matches impedances between the mixer and the following circuits The sideband structu...

Page 70: ...B from the input to the output of the module OP AMP section U1C is not used and is as shown in the schematic connected in an inoperative condition 3 2 8 TYPE 791596 USB FILTER SWITCH OPTION A4A4 The schematic diagram for this circuit description is shown in Figure 6 6 The USB Filter Switch is connected in parallel with the 455 kHz Filter Switch at both the input and the output It functions like a ...

Page 71: ...amplified by Ql and applied to the upper sideband filter F Ll The upper sideband is amplified by Q2 and output via pin 57 Potentiometer R23 provides gain adjustment for equalizing the USB signal level with the other filtered IF signals Resistors R7 and R8 provide impedance matching for the filter input and output respectively 3 2 9a TYPE 791597 ISB LSB FILTER SWITCH A4A5 REVISION E The schematic d...

Page 72: ...l and applied to the lower sideband filter F Ll The lower sideband is amplified by Q2 and output via pin 57 When ISB detection mode is selected Ql is biased on by urn and CR2 as pre viously described Output amplifier Q3 is also biased on by current flow in R26 and R27 The lower sideband information is amplified by Q3 and output via pin 53 Notice that only one output amplifier is operating in eithe...

Page 73: ...ancelling any stray capacitance but the network consisting of L2 C9 CIO Cll and L3 forms a double tuned bandpass filter of approximately 35 kHz bandwidth This filter is narrow enough to suppress any broadband noise contributed by earlier stages of the receiver but at the same time is wide enough not to restrict the receiver s bandwidth Potentiometer R7 between the first and second amplifiers adjus...

Page 74: ...matic Figure 6 8 In the AGC module the direct coupled output of the AM detector is filtered by R5 and C3 to limit the speed of response of the Fast AGC In the Fast AGC Mode Q7 is biased off disconnecting C4 so Ql operates simply as an emitter follower Q7 is biased on when Slow AGC is selected grounding the negative end of C4 In this case Ql can charge C4 quickly if there is a rise in input from th...

Page 75: ...or the LSB component amplified by A4A8 This combined action is necessary to protect against possible overload of the 1st and 2nd IF s which are common to both USB and LSB Q4 duplicates the operation of Q5 When the ISB module is not installed or not selected Q4 does not conduct and may be ignored As stated in the description of the Input Converter the gain control in the 1st IF amplifier is accompl...

Page 76: ...signal for this module It is applied to both demodulators although only one is actuated at a time When FM is selected the control input at pin 41 is high 5 V and Q2 and Q1 are turned on This applies approximately 9 V to limiter U1 The input signal is amplified and clipped by cascaded stages within U1 so its output is free of any amplitude variations The extent to which the amplitude variations are...

Page 77: ...rol input to pin 47 will be low 0 V and the output of UIA will be approximately 14 V This will tend to forward bias CRland will cause gate of Ql to be similarly negative cutting off all signal flow through Ql The audio signal from the FM CW188B Detector will appear at the output of UID The signal into line audio amplifier U2 is the output of UID attenuated by the LINE AUDIO LEVEL control Rl on the...

Page 78: ...e all the way through the copper track 3 2 14 TYPE 791598 ISB DETECTOR AUDIO OPTION A4A8 The schematic diagram for this circuit description is Figure 6 10 For ISB operation two independent single sideband signals must be demodulated Since they share the same carrier frequency they may be processed together up to a certain point In this receiver ISB is handled as a single composite signal through t...

Page 79: ...R A4A2 I 1ST MIXER 2ND I f 3RDMiXER I I I NVERSlDN MIXER INVERS IDNI I OO OOOOOTO I I I 30 00000 MHz 42 905 MHz t 1 10 7 MHz I I I I I L J L J 42 91 72 90 MHz 10 KHz STEPS 32 20 32 21 MHz 10 Hz STEPS 11 153 MHz 455 t 8 9 KHz 1ST LO SYNTHESIZER 2ND LO SYNTHES IZER 3RD LO SYNTHESIZER BFO SYNTHESIZER I I I I I I I I L L _l J Figure 3 4 Frequency Synthesizers Functional Relationship 3 14 Courtesy of h...

Page 80: ... kHz section of the RF spectrum to be converted to the center of the 1st IF range 42 90 MHz to 42 91 MHz by taking the difference products from the 1st Mixer A filter follows the 1st mixer which passes signals in this 10 kHz range plus their sidebands which extend approximately 9 kHz beyond each end of this range for a total bandwidth of 28 kHz The 2nd LO tunes from 32 21000 MHz to 32 20001 MHZ in...

Page 81: ... of all 1st IF signals to 10 7 MHz The corresponding 2nd La frequencies are shown in Table 3 3 along with the resultant 2nd IF of 10 7 MHz To determine the 1st La and 2nd La frequencies corresponding to a received RF frequency refer to the examples in Table 3 4 The 3rd Mixer converts the 10 7 MHz 2nd IF to 455 kHz A fixed 3rd La frequency of 11 15500 MHz provides the necessary difference frequency...

Page 82: ...c phase lock loop configuration is shown in Figure 3 5 Depending on the application the frequency divider circuit may be fixed to divide by a certain number or may be programmable to divide by any number in a specific range 20 to 29 for example The frequency divider may consist of several counters cascaded together to provide division by a large number The operation of the basic phase lock loop re...

Page 83: ... frequency Thus the reference frequency is always multiplied by the divider ratio to give the veo output frequency From this the following relationship can be given Fvco N Fref An example of the basic phase lock loop technique using numbers will provide an understanding of its actual operation Referring to Figure 3 6 the desired frequency is obtained by programming the variable divider through sel...

Page 84: ...TER A Figure 3 7 Two Modulus Prescaling in the Phase Lock Loop In operation the prescaler divides by P 1 A times For every P 1 pulse from the prescaler both the swallow counter and programmable counter are decremented by 1 The prescaler divides by P 1 until the swallow counter reaches its zero state At this point the modulus of the prescaler changes to P and the swallow counter is disabled The pre...

Page 85: ...uration while the 3rd LO and another part of the 2nd LO use a fixed divide by N ratio The BFO uses the basic phase lock loop configuration utilizing the divide by N technique Fvco N Fref Common to all the synthesizers in this receiver is the phase detector used It will be described in detail below PROGRAM SWALLOW PRESCALER INPUT COUNTER COUNTER COUNTS PULSES 15 3 0 0 14 2 11 11 13 1 11 22 12 0 11 ...

Page 86: ...y outputs U and D remain high If the variable input leads in phase with respect to the reference input U remains high and D goes low If the variable input lags in phase with respect to the reference input D remains high and U goes low When inputs V and R are separated by a frequency difference the output at pins U or D varies high and low at a rate proportional to the difference frequency of the t...

Page 87: ...This 1 MHz reference is divided down to 50 kHZ 40 kHZ 10 kHZ and 1 kHz Buffer amplifiers Q6 and Q7 are used for isolation purposes Synthesizers that need certain reference frequencies are listed below each frequency in the diagram Refer to the schematic diagram in Figure 6 15 S2 in Figure 3 10 represents the function of U23 3 3 3 2 Circuit Description An internal source of reference is provided by...

Page 88: ...NT and on to the rest of the time base circuitry DIVIDER 25 UI5B UI7 4 40 KHz 15T LO r IMHz I I EXTERNAL r I SOURCE EXT L 2MHz TCXO UI4 UI5A 2 INT t I MHz n M v 2ND LO 0 o t i BUFFER AMP FREQUENCY 7 SOURCE SELECT DIVIDER DIVIDER DIVIDER DIVIDER 10 5 5 4 U20A U20B UI8B UI9B UI8A UI9A I KHz 10 KHz 50 KHz BFO 2ND LO 3RD LO 3RD LO Figure 3 10 Time Base Circuits Functional Block Diagram SN74125 A t C y...

Page 89: ...ime Base and a fixed output frequency of 11 155 MHz The 3rd LO utilizes a basic phase lock loop configuration and a digital mixing technique A functional description along with a circuit description is provided below 3 3 4 1 Functional Description Figure 3 12 shows a functional block diagram of the 3rd LO Included in the diagram are reference designations that correspond to the 3rd LO schematic Th...

Page 90: ...E 791576 BFO SYNTHESIZER A5A3 Functional Description The BFO Synthesizer produces a 455 kHz 8 9 kHz signal The BFO therefore tunes from 446 1 to 463 9 kHZ in 100 Hz steps This synthesizer utilizes the basic phase lock loop configuration shown in Figure 3 5 The actual phase lock loop operates at a frequency range of 10 times the BFO output to allow for the use of a 1 kHz reference frequency A funct...

Page 91: ...mined by the level of the up down U D input When low the counter counts up and when high it counts down The preset function is controlled by the state of the load inputs When a logic low is applied to the load input the BCD number at the preset inputs D C B and A is loaded into the counter and counting will begin from that number The programmable divider must produce an output of 1 kHz for any inp...

Page 92: ...h an input frequency of 4 55 MHz Notice that setting the thumbwheel switches to 0 0 kHz indicates the same VCO frequency 4 55 MHZ but initiates up counting A negative setting enters a 1001 BCD 9 in U3 making the count start from 0900 With an input of 0900 counting up to 5450 results in the same divide ratio of 4550 Assume a BFO frequency of 460 4 kHz is needed This corresponds to a thumb wheel sel...

Page 93: ...re 3 14 200 01 KHz 210 00 KHz 32 MHz PHASE LOCK 32MHz 41101 I MHz LOOP REFERENCE UI U2 U3A QI Q5 PHASE J DETECTOR U6A U6B MIXER U4 2NO LO OUTPUT 32 20001MHz 32 21000 MHz 200 210MHz PHASE LOCK LOOP 10KHz U7 THRU U12 REFERENCE UI4 UI5 Q7 DIVlbER 1000 UI6 UI7 UI8 200 01 KHz 210 00KHz Figure 3 14 2nd LO Functional Block Diagram The phase lock loop in the upper left section of the diagram has a referen...

Page 94: ...ios of 100 and 101 This needs additional modifications U15 divides by 11 when both E5 and E4 are at a low state This occurs only during the swallow counting sequence when E4 is held low by U11C U15 divides by 10 for 90 input pUlses from the VCO Because of this nine input pulses enter U14 at pin 2 At this point U14 s ripple clock output pin 15 goes low for one input pulse This enables U15 to divide...

Page 95: ...68 CK 2 OUT UI5 MCI2013 CK 15 INPUT OUTPUT FROM SWALLOW COUNTE R SWALLOW COUNTER ON E4 LOW SWALLOW COUNTER OFF E4 HIGH UI5 INPUT P U LS ES 0 I 10 10 I I I I I I 10 10 I 10 I 10 I I I I I I 0 I I I 1 I UI4 CK I LJ RC a E 5 I ____ J E4 I Q o I I OIVIOE BY IOI INPUT UI5 PULSES 10 I I I 10 10 10 10 10 10 10 I I I 10 10 I I 4 CK I f LJ ____ J 3 30 r E 4 J DIVIDE BY IOO Figure 3 15 2nd LO Prescaler Timi...

Page 96: ...o 210 00 kHz Differential amplifier U5 accepts the push pull output from U4 and amplifies the signal approximately 10 times into a single ended output Q2 translates the output level of U5 to TTL levels for the input to U6A This signal and the phase locked frequency from the programmable divider are compared in phase detector U6A producing dc voltages that are filtered by U6B these circuits are des...

Page 97: ...RTER ENCODER 23 U4 22 21 20 UI3 02 04 r i y 10 MHz I MHz 100 KHz 10 KHz L Figure 3 16 1st LO Functional Block Diagram A two modulus prescaler described in paragraph 3 3 2 3 is used at the input to the divide by N counter to divide down the frequency from the VCO so that it can be handled by conventional low power Schottky counters If the 1st LO is locked on the correct frequency the output of the ...

Page 98: ...frequency This range is from 0000 to 2999 One other condition exists at the input to the counters Ull is wired to automatically add 8 to its preset Therefore the VCO presets have a range from 8000 to 10999 The external logic circuits connected to the counters stop the counters from counting when they reach the terminal count number 3709 Since the counters are wired to count down the overall divide...

Page 99: ...enable circuit to reset the zero detector circuit causing its output to go low so the prescaler can divide by 51 during the next count cycle Refer to the schematic diagram of the 1st LO Figure 6 16 to aid in understanding the circuit descriptions presented below Figure 3 17 1st LO Counting Cycle 3 3 7 2 2 Prescaler V1 and V2A The prescaler input frequency ranges from 171 64 MHz to 291 60 MHz The p...

Page 100: ...igital Code Converter U4 U4 is a programmable ROM Read Only Memory that serves as a decoder or code converter It behaves as a look up table to translate a BCD input which has bit values of 23 22 21 20 to a new code with bit values of 51 22 21 2 0 Table 3 6 illustrates all possible inputs and outputs of U4 Table 3 6 Code Converter U4 Truth Table BCD INPUTS TO U4 OUTPUTS FROM U4 2 3 2 2 2 1 2 51 2 2...

Page 101: ...ables detection of the terminal count The Q output of U12B is set high at the beginning of each count CYCle and will not go low until the most significant swallow counter digit from U9 steps from 1 to 2 This clocks U12B validates the terminal count and the prescaler mode will be changed when the counter reaches 09 Therefore for preset values between 29 and 40 the counter cycles past the first 09 c...

Page 102: ...count for the programmable counter is 371 as explained in 3 3 7 2 6 When the programmable counter reaches terminal count the cumulative number of pUlses into the prescaler equals 4291 Since the loop reference frequency is 40 kHZ the VCO frequency is 4291 x 40 kHZ or 171 64 MHz The VCO output to the mixer is divided by 4 resulting in an actual La output of 42 91 MHz This is the La frequency corresp...

Page 103: ...XX MHz 51 102 1 1 8 7 9 0 408 510 8 1 0 7 5 0 51 561 1 2 9 7 4 1 Swallow Ctr Validation 1530 2091 30 0 9 5 9 1 Swallow Ctr Terminal 50 50 2141 1 5 9 0 Count 900 3041 18 5 0 0 1000 4041 20 4 0 0 100 4141 2 3 9 0 50 4191 1 3 8 1 Early Decode 100 4291 2 3 7 1 Terminal Count Carry Condition 4291 x 40 kHz Divide Ratio 4291 171 64 MHz 51 0 0 0 1 9 10 9 1 Preset for Tuned 51 51 1 1 8 10 9 0 Freq of 29 99...

Page 104: ...lses to reset at the end of each counting cycle Therefore the divider makes use of a two pulse early decode circuit contained in U3 Refer to Figure 3 19 When the terminal count logic conditions are satisfied at the P and B inputs U3 counts one clock pUlse then drops the FO output line low This esets the flip flops and presets loads the counters At the end of the second clock pUlse the FO output go...

Page 105: ...and Select Coding RF Digit Band Select Code Negative True 10 MHz 1 MHz 22 E3 21 E2 20 E1 Ull U10 0 0 0 0 0 0 4 0 0 1 0 8 0 1 0 1 2 0 1 1 1 6 1 0 0 2 0 1 0 1 2 4 1 1 0 2 B 1 1 1 3 3 8 3 3 8 1 TYPE 791629 VOLTAGE CONTROLLED OSCILLATOR A5A1A1 Functional Description Figure 3 20 is the functional block diagram for the Voltage Controlled Oscillator The VCO is an integral part of the 1st La Synthesizer l...

Page 106: ... the BAND SELECT inputs are negative the corresponding diode will conduct and the inductance of T1 will be reduced by the shunting effect of the inductor L2 L3 or L4 Varactor diode CR4 fine tunes the oscillator in response to the tuning voltage input Common emitter amplifier Q2 keeps load changes at the input of power divider R9 and RIO from being reflected back to the output of oscillator Ql T2 m...

Page 107: ...The synthesizers are covered in 3 3 3 4 1 TYPE 791575 2 MANUAL TUNING UP DOWN COUNTER A6A1 The Manual Tuning Up Down Counter contains the RF frequency data This information is sent to the 1st and 2nd LO Synthesizers and is encoded for multiplexing to the display board The frequency data can be changed in two ways from the Manual Tuning Module via front panel control or from the Remote Input Jack b...

Page 108: ...I DATA SYNTHESIZER 2ND LO IOLI01 A5A2 OUTPUT FREQUENCY DISPLAY J2 MODULE DATA AS f Jt t FRES NCYCO OL CO SWn 7ES LINES L1NE7 L f XAI I BFO SYNTHESIZER A5A3 BFO OUTPUT REMOTE SELECT IREMOTE SELECT 1 1 J IF MOTHERBOARD A4 IF BANDWIDTH SELECT CONTROL v UPPER CONTROL PANEL AIOAI FRONT PANEL DETECTION MODE INTERCONNECT A6A2 SELECT LOWER CONTROL v CONTROL v AUDIO METER PANEL AGC VOLTAGE AIOA2 K AUDIO _ ...

Page 109: ...OUNTER BATTERY 8 INPUT DATA SELECTOR TO DISPLAY BOARD TO I ST AND 2ND L 0 SYNTHESIZER Figure 3 22 Manual Tuning Up Down Counter Block Diagram 13 12 II C B A XO 3 XI 15 X2 9 PI P2 P3 P4 CK X3 R 10 14512 U O X4 14510 5 X5 CI X6 X7 Z 15 14 Figure 3 23 Up Down Counter Integrated Circuit Data 3 44 Courtesy of http BlackRadios terryo org ...

Page 110: ...8D will be disabled U2 will be inhibited since its carry input will be high Since the carry input of U3 is now always low it will clock for each pulse received on its clock input U8B and U8A will still be enabled allowing for normal carry operation The counter now behaves as though counter U2 is no longer in the circuit If the 103 select is chosen both U2 and U3 are disabled if the 104 is chosen U...

Page 111: ... is down It is a hot carrier diode dropping only about 0 4 V when forward biased When power is on VDD is at 5 V forward biasing the diode and charging the battery through R9 If power fails VDD drops to 0 V and diode CR1 becomes reverse biased allowing battery current to flow only to the chips connected to V DD2 The purpose of Q1 and its circuitry is to inhibit all counters when power down occurs W...

Page 112: ... diode logic is performed by CRl 3 and CR5 l0 to control the combinations of IF filters as described in paragraph 3 2 1 The truth table for analog multiplexer Ul is shown in Figure 3 24 This IC performs as three digitally controlled SPDT switches When control input A is logic low terminals X and X 0 are internally connected When A is logic high X and X1 are connected Similarly input B controls Y Y...

Page 113: ...M select line to A4 enables the bandwidth switches and inhibits the BFO as preViously described When USB mode is selected the detection mode switch connects E4 to E8 and grounds E5 and E14 This places 5 V on the USB select line to A4 and places a low at U1 input A This disables the IF bandwidth switches and turns off Q1 fixing the BFO at 455 kHz as previously described When LSB mode is selected th...

Page 114: ...ged the receiver locks to the frequency currently being displayed any other tuning button will be released and manual tuning is disabled In receivers with the MCM 2 remote control option depressing the tuning button enables remote control operation 3 4 5 ENCODER ASSEMBLY A7U1 This assembly converts tuning knob rotation to digital pulses for the Manual Tuning Up Down Counter When the tuning knob is...

Page 115: ...o Q2 data on its A B and C inputs and places a high on the Q output with the equivalent binary value UI0 is an eight section buffer inverter capable of providing up to 500 rnA of sink current Operation of the circuit is described below The Up Down Counter places digit dispiay information into the A B and C inputs of U9 BCD information enters the A B C and D lines of US In US this information is de...

Page 116: ...ection mode gain mode and meter mode Each gang of switches mechanically operates to allow only one pushbutton to be depressed at any time All control lines connect to the Front Panel Interconnect card The schematic diagram for this circuit is shown in Figure 6 20 3 4 10 TYPE 791826 LOWER PANEL CONTROL AI0A2 The Lower Panel Control allows selection of IF bandwidth and variation of RF gain and phone...

Page 117: ...red by A1C1 and A1C2 and sent to regulators U1 and U2 The 16 Vac is rectified by CR1 and CR2 which are located on the back of the chassis and returned to the Distribution board to be filtered by A1C3 and A1C4 to become a 10 V unregUlated supply 3 5 2 POWER SUPPLY REGULATORS U1 and U2 are located on the back of the chassis and provide regulated 15 Vdc and 15 Vdc respectively These two voltages are ...

Page 118: ...n procedures on a routine basis A recommended Periodic Maintenance Schedule is shown in Table 4 1 Table 4 1 Periodic Maintenance Schedule Procedure Interval Comments Cleaning 60 days Interval variable depending on on operating environment Lubrication 30 days Interval variable depending on equipment use Inspection for Damage 60 days Interval variable depending or Wear on operating environment and e...

Page 119: ...er solution Use a cotton tipped applicator for cleaning in narrow spaces and on the circuit boards 3 Switch Contacts When maintenance is necessary due to accumulated dirt and dust on the contacts observe the follow ing precautions Clean the switch contacts with isopropyl alcohol or a mild detergent solution Avoid cleaning solutions containing benzene acetone or similar solvents 4 2 2 LUBRICATION T...

Page 120: ...ts 7 Inspect the printed circuit boards for damaged tracks loose connections corrosion or other signs of deterioration 8 Inspect the PC connectors interface connectors and chassis wiring for excessive wear looseness misalignment corrosion or other signs of deterioration 4 4 TEST EQUIPMENT REQUIRED The test equipment listed in Table 4 2 or their equivalents are required to perform the given mainten...

Page 121: ...RF output HP8640B from 111 dBm to 0 dBm Oscilloscope dc to 50 MHz HP180C RF Voltmeter 1 mV to 3 0 V 50 dBm Boonton 92B to 20 dBm Variable Trans Metered output from General Radio W5MT3A former 90 115 Vac Variable Trans Output variable from General Radio W5HMT former 180 220 Vac Digital Counter oto 500 MHz HP5303A AC Voltmeter 1 mV to 300 V full scale HP 400E DVM dc ranges 1 or better Fluke 8100A Du...

Page 122: ... within a defective PC board are provided by the Component Level Troubleshooting procedures given in 4 7 6 After PC board replacement verify receiver operation by conducting the Performance Tests in 4 6 Receivers should not be acceptable for use unless all Minimum Performance Stand ards listed in Table 4 3 are met or exceeded 4 6 PERFORMANCE TESTS 4 6 1 GENERAL The Performance Tests determine if t...

Page 123: ...t Audibility in headphones with 97 dBm input and 4 8 kHz deviation Audibility in headphones with 97 dBm unmodulated input 100 dB control range Control range 97 dBm to 3 dBm with 6 dB output change 100 Hz at 500 kHz and 29 99999 MHz When conducting the Peformance Tests the technician should comply with the following guidelines 1 Read each paragraph and test procedure carefully before attempting to ...

Page 124: ...R PARA 4 7 5 FOR ALL BW s SIGNAL 1 AT A4TP3 PARA 4 7 11 NO I YES YES I I IS 3RD LO REINSTALL A4A3 TROUBLESHOOT TROUBLESHOOT CHECK 3RD LO NO 6 dbm 0 112 VRMS 4 A4A4 A4A5 REMOVE POWER SUPPLY 3RD LO SIGNAL INPUT AT 11 155 MH A4A2 INJECT SIGNAL PARA 4 7 3 PARA 4 7 20 AT W6Pl0 TO A4A2 2 AT A4TPI3 NO r IS IF OUTPUT REINSTALL A4Al IS IF OUTPUT IS IF OUTPUT CHECK LOADING BY TROUBLESHOOT 10 7 REINSTALL A4A...

Page 125: ...USB REMOVE A4AI0 CHECK LINE IS BFO SIGNAL IS VOLTAGE TROUBLESHOOT OUTPUT NO NO NO FI LTER SWITCH AT A6XA2 60 AND INJECT SIGNAL TRANSFORMER T2 AT A4TPI5 40 mv UPPER PANEL OK PARA 4 7 9 8 AT A4XAI0 56 AND CABLING AT 455 KHi 0 5 VDC CONTROL SWITCHES XES YES YES It I REPEAT TROUBLESHOOT VOLTAGE TROUBLESHOOT TROUBLESHOOT CAN 400 Hi IS VOLTAGE TEST NO FRONT PANEL NO NO LOWER PANEL BE HEARD IN AT A4XA9 4...

Page 126: ...RANGE YES YES DOES RF GAIN CONTROL WORK TROUBLESHOOT UPPER PANEL CONTROL SWITCHES NO YES IS VOLTAGE AT A4XA9 41 2 5 VDC YES NO IS VOLTAGE AT AIOPI 16 0 5VDC YES IS VOLTAGE AT A4XA9 43 2 5 VDC TROUBLESHOOT UPPER PANEL CONTROL SWITCHES TROUBLESHOOT FM DETECTOR PARA 4 7 12 TROUBLESHOOT AGC BOARD PARA 4 7 15 NO YES IS AGC OPERATION SATISFACTORY TROUBLESHOOT FRONT NO ANEL INTERCONNECT PARA 4 7 16 IS VO...

Page 127: ...splay should illuminate almost instantly Dis play intensity should be bright and uniform 5 Depress the 10 Hz tuning rate button and rotate the tuning knob until the 10 Hz Frequency Display digit reads O 6 Depress the 100 Hz tuning rate button and rotate the tuning knob until the 100 Hz Frequency Display digit reads O 7 Depress the 1 kHz tuning rate button and rotate the tuning knob until the 1 kHz...

Page 128: ...dicate 21 dBm 2 dBm 10 Set the Generator output frequency to 15 00350 MHz Depress the LSB button The RF Voltmeter should indicate 21 dBm 2 dBm 11 Disconnect the Signal Generator from the RF Input Jack A2J1 and connect a 50 Q termination to A2Jl 12 Depress the receiver AM Mode switch and the 16 kHz BW switch The RF Voltmeter should indicate 38 dBm 2 dBm 13 Depress the receiver 6 kHz BW switch The R...

Page 129: ...o 29 99990 MHz unmodulated and output level to 103 dBm 3 Set the RF Voltmeter to the 20 dBm range 4 Set the receiver controls as follows a b c d e f g h RF Gain Phone Level IF Bandwidth Tuning Rate Detection Mode Gain Mode Meter Power Maximum Clockwise Maximum Counterclockwise 6 kHz Disable AM Manual Signal Strength OFF 5 Energize the receiver by depressing the POWER ON pushbutton 6 Select the app...

Page 130: ... RF VOLTMETER GENERATOR RF RF IF OUT INPUT OUT IN A2Jl J12 D l D C f II f 50 n RF PROBE Figure 4 3 SIN Ratio Performance Test Setup 4 6 7 DETECTION MODE PERFORMANCE TEST 1 Connect test equipment to the receiver as shown in Figure 4 4 2 Set the Signal Generator output frequency to 15 00500 MHz and output level to 97 dBm Set the Generator for 50 AM modulation at 400 Hz 3 Set the Voltmeter to the 50 ...

Page 131: ... 6 Vac CAUTION Line Audio output levels in excess of 35 Vac may cause damage to the receiver and or the 600 Q load resistor 10 The Oscilloscope should show a clean sine wave with no evi dence of clipping or distortion 11 Turn off the Signal Generator modUlation 12 Depress the receiver CW and 1 kHz buttons Set the receiver BFO OFFSET to 0 4 kHz 13 A clear distinct 400 Hz tone should be heard in the...

Page 132: ...ator Modulation to FM modulation frequency to 400 Hz and deviation to 4 8 kHz Depress the receiver 16 kHz and FM buttons A clear distinct 400 Hz tone should be heard in the headphones Deenergize the receiver and disconnect test equipment RF OUT c A2JI RF INPUT ISB P AUCDTIOl PHONES I J12 0 TB2 HF RECEIVER VOLTMETER INPUT DUAL TRACE OSCILLOSCOPE A B INPUT INPUT 60 HEAD PHONES 600 n 1 4W 600 n 4W l ...

Page 133: ... for an indication of 34 6 Vac on the Voltmeter 8 Turn the receiver RF Gain control fUlly counterclockwise 9 Increase the Signal Generator output level to 3 dBm 10 The Voltmeter should indicate less than 34 6 Vac Rotate the receiver RF Gain control clockwise until the Voltmeter indi cates 34 6 Vac 11 Decrease the Signal Generator output level to 87 dBm 12 Select the receiver AGC Fast Gain Mode 13 ...

Page 134: ...shown in Figure 4 6 2 Set the Signal Generator output frequency to 00 50001 MHz unmodulated and output level to 97 dBm 3 Set the Frequency Counter to provide 10 Hz resolution at a 1 sec sample rate 4 Set the receiver controls as follows a b c d e IF Bandwidth Tuning Rate Detection Mode Gain Mode Power 6 kHz Disable AM Fast AGC OFF 5 Energize the receiver 6 Select the appropriate tuning rate button...

Page 135: ...Tune the receiver to 29 99999 MHz 10 The Frequency Counter should indicate an IF output frequency of 455 00 kHz 0 10 kHz 11 Deenergize the receiver and disconnect the test equipment FIGURE 4 6 SIGNAL HF RECEIVER FREQUENCY GENERATOR COUNTER RF IF OUT RFIN OUT INPUT A2Jl J12 D tl Figure 4 6 Frequency Tuning Performance Test Setup 4 21 Courtesy of http BlackRadios terryo org ...

Page 136: ...MAINTENANCE 4 22 THIS PAGE LEFT BLANK WJ 8718 HF RECEIVER Courtesy of http BlackRadios terryo org ...

Page 137: ...PUT CONVERTER CHECKOUT PROCEDURE REFER TO PARA 4 7 5 TROUBLESHOOT MIXER 1ST IF USING VOLTAGE TABLE DOES SCOPE YES INDICATE 3V P P AT 10 7 MHZ DOES SCOPE NO INDICATE 05 V P P AT 43 MHi INPUT CONVERT ER IS OPERATIO NAL CHECK Ul AND C2 POWER SUPPLY IS OPERATIONAL IS rv 10 VDC PRESENT AT E3 IS I V 15 VDC PRESENT AT E 1 YES CHECK A1C3 A1C4 CR1 CR2 AND T1 IS IV 15 VDC PRESENT AT E2 IS rv 22 VDC PRESENT ...

Page 138: ... A4TP3 PERFORM 455 KHl FILTER SWITCH CHECKOUT PROCEDURE REFER TO PARAA 7 8 r IS OUTPUT r YES lJ 15 my P P NO ON ALL BW POSITIONS YES It NO 11 IS S VDC PRESENT AT PIN AS 51 YES NO DOES SCOPE YES INDICATE 453 5 KHi ATtv 200my p p AT A4 57 TROUBLESHOOT ISB LSB FILTER SWITCH USING VOLTAGE TABLE I NO IS 5 VDC PRESENT AT PIN A4 51 YES DOES SCOPE YES INDICAT E 456 5 KHl N_O OUTPUT AT PIN A4 57 It TROUBLE...

Page 139: ...TABLE TROUBLESHOOT FRONT PANEL OR INTERFACE DOES SCOPE INDICATE 1 12 V pop AT 400 Hi AT A9 57 PERFORM CW SSB DETECTOR CHECKOUT PROCEDURE REFER TO PARA 4 7 12 CW SSB DETECTOR IS OPERATIONAL TROUBLESHOOT 455 KHi AMPLIFIER USING VOLTAGE TABLE PERFORM 455 KHi AMPL AM DETECTOR GAIN ADJUSTMENT REFER TO PARAA 8 3 4 NO F DOES SCOPE r YES INDICATE IV 60my NO p p AT 455 KHi AT PIN A7 13 1 TROUBLESHOOT 455 K...

Page 140: ...GE TABLE TROUBLESHOOT U2 AND ASSOCIATED COMPONENTS YES INJECT 400 Hi AT 1 VRMS AT PIN AI0 53 IS 3 VDC PRESENT AT PIN AI0 41 NO TROUBLESHOOT METER DETECTOR CRI AND CR2 TROUBLESHOOT Al0 U1A AND ASSOCIATED COMPONENTS NO DOES SCOPE INDICATE AI 2 V P P AT 400 Hi ACROSS Al0Rl1 YES DOES SCOPE YES INDICATE J 2 V NO 1 P P AT 400 Hi AT A10 19 TROUBLESHOOT A10Ql AND ASSOCIATED COMPONENTS TROUBLESHOOT Al0 U1D...

Page 141: ...NO INDICATE rv S V YES r P_P AT 400 Hi BETWEEN A8 44 a A8 48 TROUBLESHOOT A8U3A AND ASSOCIATED COMPONENTS CHECK A8C1 AND A8R1 NO DOES SCOPE YES INDICATE IV 120 my NO p p AT 455 KHr AT ASU1 8 IS 15 VDC PRESENT AT A8U2 1 YES TROUBLESHOOT AGC DETECTOR NO IS 2 5 VDC PRESENT AT PIN A8 43 YES ISB DETECTOR IS OPERATIONAL TROUBLESHOOT U2B AND U2C AND ASSOCIATED COMPONENTS TROUBLESHOOT A8Ul AND ASSOCIATED ...

Page 142: ...g 1 Allow the test equipment a 30 minute warm up 2 Read the procedure before beginning a test 3 After the repair verify correct PC board operation by repeating the PC board Checkout Procedure 4 7 3 POWER SUPPLY TESTING AND TROUBLESHOOTING Power Supply Testing and Troubleshooting includes a checkout procedure and fault isolation information A Digital Voltmeter Table 4 2 is required to perform the t...

Page 143: ... trace the fault to a defective component or connection After the fault has been corrected check the Power Supply for normal operation by repeating the Checkout Procedure in paragraph 4 7 3 1 above l Figure 4 7 Power Supply Troubleshooting Tree 2 Figure 6 22 WJ 8718 Main Chassis Schematic Diagram 3 Paragraph 3 5 Power Supply Circuit Description 4 Figure 5 5 Power Distribution Location of Component...

Page 144: ...2P1 to A3A1J1 RF Filter Fault Isolation 1 Remove the filter from the receiver and remove the filter s protective cover 2 Check all capacitors and the two Zener diodes for leakage to ground 3 Check all inductors for continuity 4 Excessive loss above 20 MHz may be corrected expanding or compressing some of the inductors 4 7 5 INPUT CONVERTER TESTING AND TROUBLESHOOTING Input Converter Testing and Tr...

Page 145: ...in fault isolation Use the Troubleshooting Tree to isolate the fault to a stage or circuit Use the other Troubleshooting Data to trace the fault to a defective component or connection After the fault has been corrected check the Input Converter for normal operation by repeating the Checkout Procedure in paragraph 4 7 5 1 above 1 Figure 4 8 Input Converter Troubleshooting Tree 2 Table 4 4 Input Con...

Page 146: ...in the sequence given If any specified result is not obtained refer to paragraph 4 7 6 2 for fault isolation 1 Deenergize the receiver 2 Disconnect connector P19 from A4XA1 3 Remove PC board A4A2 4 Depress the receiver 3 2 kHz BW button 5 Connect the Oscilloscope to A4XA1 pin 57 using a short coaxial cable with clip leads on one end 6 Connect the Signal Generator to A4XA1 pin 13 using a short coax...

Page 147: ...h Schematic Diagram 10 7 MHz Filter Switch Circuit Description 10 7 MHz Filter Switch Location of Components Parts Replacement Guidelines 10 7 MHz Filter Switch Adjustment Table 4 5 10 7 MHz Filter Switch Voltage Table Bandwidth kHz Bandwidth kHz PIN 16 6 3 2 PIN 16 6 3 2 Q1 1 14 7 14 7 14 4 Q4 1 14 9 14 8 14 9 2 0 0 0 0 4 6 2 0 0 4 6 0 0 3 1 0 1 0 1 4 3 0 94 0 8 0 94 4 1 1 1 1 1 9 4 1 4 1 99 1 4 ...

Page 148: ...leshooting Tree 10 7 MHz Filter Switch Voltage Table 10 7 MHz Filter Switch Schematic Diagram 10 7 MHz Filter Switch Circuit Description 10 7 MHz Filter Switch Location of Components 6 Paragraph 4 7 23 Parts Replacement Guidelines 7 Paragraph 4 8 3 2a 10 7 MHz Filter Switch Adjustment Table 4 5a 10 7 MHz Filter Switch A4Al Voltage Table BANDWIDTH kHz BANDWIDTH kHz PIN 16 6 0 3 2 PIN 16 6 0 3 2 Q1 ...

Page 149: ...WI 8718 HF RECEIVER 4 38b THIS PAGE LEFT BLANK MAINTENANCE Courtesy of http BlackRadios terryo org ...

Page 150: ...should be a clean sine wave 6 Deenergize the receiver and disconnect Test Equipment Replace PC boards A4A1 A4A3 A4A4 and A4A5 4 7 7 2 10 7 MHz 455 kHz Converter Fault Isolation The following list of Supplementary Troubleshooting Data is used as an aid in fault isolation Use the Troubleshooting Data to isolate the fault to a stage or circuit and then trace the fault to a defective component or conn...

Page 151: ...tor output frequency to 455 kHz and output level to 36 dBm 6 Energize the receiver The Oscilloscope should display a level of 15 mVp p at 455 kHz The waveform should be a clean sine wave 7 Depress the 1 0 kHz BW button and then the 0 3 kHz BW button The Oscilloscope should display a level of 15 mV p p at 455 kHz for both BW positions 8 Deenergize the receiver and disconnect test equipment Replace ...

Page 152: ...1 8 1 8 1 8 C 14 9 14 9 14 9 Q2 E 0 0 0 0 0 9 B 1 5 1 5 1 5 C 14 14 14 Q3 E 0 0 2 3 0 0 B 3 3 3 C 14 9 14 3 14 8 Q4 E 0 0 0 8 0 0 B 1 4 1 4 1 4 C 14 14 14 Q5 E 1 25 0 0 0 0 B 1 9 1 9 1 9 C 14 7 14 7 14 7 Q6 E 0 8 0 0 0 0 B 1 4 1 4 1 4 C 14 14 14 4 7 9 USB FILTER SWITCH TESTING AND TROUBLESHOOTING USB Filter Switch Testing and Troubleshooting includes a checkout procedure and fault isolation inform...

Page 153: ... display a level of 200 mV p p at 456 5 kHz The waveform should be a clean sine wave 6 Deenergize the receiver and disconnect test equipment 7 Replace PC boards A4A2 A4A3 A4A5 and A4A7 4 7 9 2 USB Filter Switch Fault Isolation The following list of Supplementary Troubleshooting Data is used as an aid in fault isolation Use the Troubleshooting Tree to isolate the fault to a stage or circuit Use the...

Page 154: ...ec tion After the fault has been corrected check the USB Filter Switch for normal opera tion by repeating the Checkout Procedure in paragraph 4 7 9 1 above 1 Figure 4 11 USB Filter Switch Troubleshooting Tree 2 Table 4 8a USB Filter Switch Voltage Table 3 Figure 6 6a USB Filter Switch Schematic Diagram 4 Paragraph 3 2 8a USB Filter Switch Location of Components 5 Paragraph 4 7 23 Parts Replacement...

Page 155: ...MAINTENANCE 4 42b THIS PAGE LE FT BLANK WJ 8718 HF RECEIVER Courtesy of http BlackRadios terryo org ...

Page 156: ...A2 A4A2 A4A4 A4A7 and A4A8 3 Connect the Oscilloscope Vertical Input to A4XA5 pin 57 using a short coaxial cable with clip leads on one end Connect cable shield to the IF Motherboard ground plane 4 Connect the Signal Generator RF output to A4XA5 pin 13 using a short coaxial cable with clip leads on one end Connect cable shield to the IF Motherboard ground plane Set the Generator output frequency t...

Page 157: ... Table 4 8a USB Filter Switch A4A4 Voltage Table Revision G Pin USB Mode Other Mode Q1 C 14 69 15 38 B 2 34 2 15 E 1 68 0 00 Q2 C 14 78 15 38 B 1 80 1 76 E 1 14 0 00 PRODUCT IMPROVEMENT 4 43a Courtesy of http BlackRadios terryo org ...

Page 158: ...W 8718 RF RECEIVER THIS PAGE LEFT BLANK MA INTENANCE 4 43b Courtesy of http BlackRadios terryo org ...

Page 159: ...Filter Switch Voltage Table ISB LSB Filter Switch Option Schematic Diagram ISB LSB Filter Switch Option Circuit Description ISB LSB Filter Switch Option Location of Components Parts Replacement Guidelines ISB LSB Filter Switch Adjustment Table 4 9 ISB LSB Filter Switch Voltage Table PIN LSB MODE ACTIVE ISB MODE ACTIVE OTHER MODES ACTIVE Q1 1 14 4 14 4 15 2 4 2 4 2 0 0 3 2 2 2 2 2 0 4 2 7 2 7 2 0 Q...

Page 160: ...Table 4 9a 3 Figure 6 7a 4 Paragraph 3 2 9a 5 Figure 5 l6a ISB LSB Filter Switch Troubleshooting Tree ISB LSB Filter Switch Voltage Table ISB LSB Filter Switch Option Schematic Diagram ISB LSB Filter Switch Option Circuit Description ISB LSB Filter Switch Option Location of Compo nents 6 Paragraph 4 7 23 Parts Replacement Guidelines 7 Paragraph 4 8 3 Sa USB and ISB LSB Filter Switch Adjustment Tab...

Page 161: ...CIRCUIT DESCRIPTION 4 44b THIS PAGE LE FT BLANK W 8718 HF RECEIVER Courtesy of http BlackRadios terryo org ...

Page 162: ... at 455 kHz 7 Turn on the Signal Generator AM Modulation and set it for 50 modulation at 400 Hz 8 Move the Oscilloscope clip lead to A4X47 pin 51 The Oscillo scope should display a level of 0 3 V p p at 400 Hz The waveform should be a clean sine wave 9 Deenergize the receiver and disconnect test equipment 10 Replace PC boards A4A3 A4A6 A4A9 and A4A10 4 7 11 2 455 kHz Amplifier AM Detector Fault Is...

Page 163: ...B 0 0 B 0 95 C 15 0 C 15 0 NOTE Above readings taken in Fast AGC Mode with no RF input signal FM CW SSB DETECTOR TESTING AND TROUBLESHOOTING FM CW SSB Detector Testing and Troubleshooting includes a CW SSB Detector Checkout Procedure an FM Detector Checkout Procedure and fault isolation information A Signal Generator and a wideband Oscilloscope Table 4 2 are required to perform the tests outlined ...

Page 164: ...rds A4A7 and A4A10 3 Connect the Oscilloscope Vertical Input to A4XA9 pin 57 using a short coaxial cable with clip leads on one end Connect cable shield to the IF Motherboard ground plane 4 Connect the Signal Generator RF output to A4XA9 pin 13 using a short coaxial cable with clip leads on one end Connect cable shield to the IF Motherboard ground plane Set the generator output frequency to 455 kH...

Page 165: ...M FM SB Pin AM FM SB Q1 E 9 6 8 1 9 2 U2 1 1 6 1 6 1 6 Q1 B 9 5 7 3 9 2 U2 3 1 7 1 7 1 7 Q1 C 0 0 8 0 0 0 U2 4 1 6 1 6 1 6 U2 5 3 8 3 8 3 8 Q2 E 0 0 2 0 0 0 U2 6 0 7 0 7 3 8 Q2 B 0 0 0 62 0 0 U2 7 0 0 0 0 0 0 Q2 C 9 9 0 0 9 2 U2 8 0 1 0 1 0 0 U2 9 0 0 0 0 0 0 Q3 E 9 6 8 7 9 0 U2 12 0 7 0 7 4 0 Q3 B 9 6 8 7 8 4 U2 13 0 7 0 7 4 0 Q3 C 1 8 1 8 9 0 U2 14 13 0 13 0 13 0 Q4 E 0 0 0 0 0 0 U3 1 0 0 0 3 0 ...

Page 166: ...he Signal Generator Modulation Frequency to 400 Hz set Audio Output Level to 1 0 V rms and set AM switch to INT 6 Energize the receiver and depress the AM Mode button The Oscilloscope should display a level of 2 V p p at 400 Hz The waveform should be a clean sine wave 7 Set the Generator Audio Output Level to 10 mV Move the Generator clip lead to A4XA10 pin 17 Use the Oscilloscope lead to probe A4...

Page 167: ...lines Table 4 12 Audio Amplifier Voltage Table PIN AM MODE ACTIVE OTHER MODES ACTIVE Q1 S 0 0 0 0 D 0 0 0 0 G 0 0 13 Q2 E 22 22 B 22 5 22 5 C 23 23 U1 1 14 14 2 1 6 1 6 3 5 0 0 U2 2 11 11 13 11 11 4 7 14 ISB DETECTOR AUDIO TESTING AND TROUBLESHOOTING ISB Detector Audio Testing and Troubleshooting includes a checkout procedure and fault isolation information A Signal Generator and an Oscilloscope T...

Page 168: ...he Oscilloscope should display 0 0 Vdc 8 Increase the Generator output level by 10 dBm The level displayed on the Oscilloscope should increase to 2 5 Vdc 9 Deenergize the receiver and disconnect the test equipment 10 Replace PC boards A4A5 and A4A6 ISB Detector Audio Fault Isolation The following list of Supplementary Troubleshooting Data is used as an aid in fault isolation Use the Troubleshootin...

Page 169: ...ng and Troubleshooting includes a checkout procedure and fault isolation information A Signal Generator and a Digital Voltmeter Table 4 2 are required to perform the tests outlined below 4 7 15 1 AGC Checkout Procedure Perform the following procedure in the sequence given If any specified result is not obtained refer to paragraph 4 7 15 2 for fault isolation 1 Deenergize the receiver 2 Remove PC b...

Page 170: ...nd disconnect test equipment 12 Replace PC boards A4A3 A4A4 A4A5 and A4A10 TABLE 4 14 4 7 15 2 AGC Fault Isolation The following list of Supplementary Troubleshooting Data is used as an aid in fault isolation Use the Troubleshooting Data to isolate the fault to a stage or circuit and then to trace the fault to a defective component or connection After the fault has been corrected check the AGC boa...

Page 171: ...01 0 0 0 0 Q7 E 0 0 0 0 0 0 0 0 0 0 0 0 B 3 9 0 62 3 9 3 9 0 63 3 9 C N A N A N A N A N A N A U1 1 2 0 2 2 2 2 0 06 0 07 0 07 2 2 0 2 2 2 2 0 06 0 07 0 07 3 2 0 2 2 2 2 0 05 0 06 0 05 4 14 3 14 3 14 4 14 4 14 3 14 4 5 0 0 5 0 0 0 0 0 5 0 0 0 6 1 5 1 7 1 7 1 7 1 7 1 7 7 12 6 12 9 12 6 12 9 12 9 12 6 8 2 0 2 2 2 2 0 05 0 05 0 05 9 0 0 0 0 0 0 0 0 0 0 0 0 10 0 0 0 0 0 0 0 0 0 0 0 0 11 13 8 13 8 13 8 ...

Page 172: ...duce gain control setting to achieve the same meter reading as in AGe Mode 4 7 16 FRONT PANEL INTERCONNECT TESTING AND TROUBLESHOOTING Front Panel Interconnect Testing and Troubleshooting includes a checkout proce dure and fault isolation information A Digital Voltmeter Table 4 2 is required to perform the tests outlined below 4 7 16 1 Front Panel Interconnect Checkout Procedure Perform the follow...

Page 173: ... isolate the fault to a stage or circuit Use the other Troubleshooting Data to trace the fault to a defective component or connection After the fault has been corrected check the Front Panel Interconnect for normal operation by repeating the Checkout Procedure in paragraph 4 7 16 1 above 1 Figure 6 13 WJ 8718 Main Chassis 2 Paragraph 3 4 2 Front Panel Interconnect Circuit Description 3 Figure 5 31...

Page 174: ... clean sine wave 7 Deenergize the receiver and disconnect test equipment 4 7 17 2 Lower Panel Control Fault Isolation The following list of Supplementary Troubleshooting Data is used as an aid in fault isolation Use the TrOUbleshooting Data to isolate the fault to a stage or a circuit and then to trace the fault to a defective component or connection After the fault has been corrected check the Lo...

Page 175: ...a fault to a defective stage or circuit Supplementary Troubleshooting Data is provided in paragraph 4 7 18 3 to aid in tracing the fault to a defective component or connection 1 VCO Band Select Circuitry Table 4 16 below checks for proper operation of U13 diodes CR8 through CR10 and Q1 through Q3 while dialing different frequencies on the front panel Table 4 16 VCO Band Select Code TUNED FREQUENCY...

Page 176: ... U5 If not present troubleshoot 1st LO counter circuits Refer to Figure 4 18 to understand the function of the phase detector 4 1st LO veo The 1st LO veo is located on the 1st and 3rd LO PC board It is recommended to read the circuit description of the VCO before troubleshooting paragraph 3 3 8 The frequency of the oscillator Q1 is controlled by the band select code and the tuning voltage The corr...

Page 177: ... LO Synthesizer Checkout Procedure Perform the following procedure in the sequence given If any specified result is not obtained refer to paragraph 4 7 19 2 for fault isolation 1 Deenergize the receiver 2 Disconnect connector W4P4 from A2Jl 3 Connect the Frequency Counter to P4 4 Energize the receiver and tune to 00 00000 MHz The Frequency Counter shoUld indicate 32 21 MHz 5 Tune the receiver to 0...

Page 178: ... input waveforms at pin 3 of U3 equals the time for one output waveform at pin 5 of U3 If not determine that the input levels are correct for TTL Jow state less than 0 8 V high state greater than 2 0 V If these levels do exist and the output is not correct replace U3 U2 is a divide by 16 counter The time for 16 input waveforms at pin 8 of U2 equals the time for one output waveform at pin 12 of U2 ...

Page 179: ...t point E3 Recheck the voltage at test point E3 to be certain that it remains between 2 0 Vdc and 6 5 Vdc as the receiver is tuned from 15 00000 to 15 00999 MHz f If the problem appears to be in the VCO read Section III paragraph 3 3 8 then troubleshoot 4 Output Loop a Measure the frequency of the output at module pin B15 If no signal is present there is a problem in the VCO or its output amplifie...

Page 180: ...ere may be some distortion present at the output of U5 which is reduced at the base of Q2 e If the signals at Pins 1 and 3 of U6 both appear correct compare its outputs at Pins 2 and 13 with those of Figure 4 19 If these appear correct the problem must be in the amplifier section of U6 pins 8 and 9 and its connection to the VCO 4 7 19 3 2nd LO Synthesizer Supplementary Troubleshooting Data The fol...

Page 181: ...d in paragraph 4 7 20 3 to aid in tracing the fault to a defective component or connection 1 Assure all inputs to the 3rd LO circuitry are correct If not troubleshoot Time Base circuits a 50 kHz signal at pin 11 of U21 b 10 kHz signal at pin of U21 2 Operation of U21 The time for two input waveforms at Pin 3 of U21 equals one output waveform at pin 5 of U21 If not replace U21 3 Operation of U22 Ob...

Page 182: ...nd select CW Mode Set the BFO offset to 0 0 kHz The Frequency Counter should read 455 000 kHz 5 Set the BFO Offset first to 8 9 kHz and then to 8 9 kHz The Frequency Counter should read 463 900 kHz and 446 1 kHz respectively 6 Disconnect the Frequency Counter and reconnect W7Pll to J8 7 Connect the Oscilloscope input to A4TP15 using a shielded cable with clip leads on one end Connect cable shield ...

Page 183: ...z U4 11 1 kHz U6 2 46 kHz U7 2 455 kHz U4 14 4 55 MHz U6 3 12 kHz U7 4 910 kHz U5 8 27 kHz U6 4 228 kHz U7 5 2 275 kHz U5 9 9 kHz U6 5 455 kHz U7 6 455 kHz U5 10 23 kHz U6 6 24 kHz U7 8 4 55 kHz U5 12 46 kHz U6 8 1 kHz U7 9 4 55 kHz U5 13 91 kHz U6 9 1 kHz U8 2 1 kHz 3 Phase Detector U9 a 1 kHz signal should be seen at pin 1 of U9 If not troubleshoot Time Base circuits b A voltage level of roughly...

Page 184: ... Troubleshooting includes a checkout procedure and fault isolation information A Frequency Counter and a wideband Oscilloscope Table 4 2 are required to perform the tests outlined below 4 7 22 1 Time Base Checkout Procedure Perfom the following procedure in the sequence given If any specified result is not obtained refer to paragraph 4 7 22 2 for Fault Isolation 1 Deenergize the receiver 2 Connect...

Page 185: ...rtional to the time for one output waveform by the dividing ratio of the IC Table 4 21 Time Base Frequency Chart IC PIN FREQUENCY IC PIN FREQUENCY U15 5 1 MHz U18 12 10 kHz U15 6 1 MHz U19 5 250 kHz U15 8 2 MHz U19 12 50 kHz U15 12 200 kHz U20 5 5 kHz U17 12 40 kHz U20 12 1 kHz U18 5 500 kHz U23 8 1 MHz U18 8 1 MHz U23 11 1 MHz 4 7 22 3 Time Base Supplementary Troubleshooting Data The following li...

Page 186: ...unsoldering diodes or resistors solder quickly to allow as litHe heat conduction as possible When wiring permits use a heat sink between the soldering iron and the part 2 When soldering or unsoldering transistors use a low wattage iron and a heat sink Solder as quickly as possible The use of a circular soldering tip to heat all three or four joints simulta neously is recommended 3 When soldering o...

Page 187: ...ted in Table 4 22 components L2 L3 and L4 align the VCO in more than one band 5 Align each VCO band monitoring the voltage at module pin BI Then check the 1st LO frequency band test point E3 in the VCO while dialing the tuned frequency in 10 kHz steps starting with 00 00000 MHz Table 4 22 VCO Alignment Parameters 1st LO VOLTAGE FREQ BAND Pin B1 ALIGNMENT VCO Band MHz Typical COMPONENT 0 42 91 46 9...

Page 188: ...000000 MHz and that the 10 kHz reference frequency at pin A57 is 10 000 kHz NOTE If the two reference frequencies are not cor rect perform the Time Base Adjustment Pro cedure before proceeding with the 2nd La Synthesizer Alignment 2 32 MHz Loop Alignment a Connect the Digital Voltmeter to test point E1 b Adjust capacitor C51 until a Voltmeter reading of 3 0 Vdc is observed with the alignment tool ...

Page 189: ...nimum of 30 minutes e Tune the receiver to 00 00499 MHz f With the receiver in operation remove the bottom pro tective cover g Using the Digital Voltmeter check the Loop Test Point Voltages as indicated in Table 4 23 Table 4 23 Loop Test Point Voltages Parameter Pin Number Test Point Voltage 32 MHz Loop TP A5XA2 B57 3 Vdc 0 1 Vdc Programmable Loop TP A5XA2 A51 4 Vdc 0 1 Vdc Output Loop TP A5XA2 A5...

Page 190: ...ctive cover on the receiver k This completes the 2nd LO Synthesizer Alignment Pro cedure 4 8 2 3 4 8 2 4 2nd LO Filter Adjustment 1 Deenergize the receiver 2 Disconnect connector P4 from A2J1 of Input Converter A3 3 Connect the RF Voltmeter and 50 Q adapter to P4 4 Set Voltmeter to 0 dBm 0 3 mY scale and energize the receiver 5 Adjust A5C13 for maximum Voltmeter reading A5C13 is located on the bot...

Page 191: ...energize the receiver and disconnect Digital Counter Replace A5A1A2 board into the proper slots BFO Synthesizer Alignment Two alignments are required for the BFO Synthesizer A5A3 Capacitor C8 and resistor R1 are interdependent and must be aligned simultaneously 1 Mount the BFO Synthesizer board on extender cards 2 Adjust C8 until the closest reading to 3 0 Vdc is seen at module pin 7 3 Adjust Rl u...

Page 192: ...the Signal Generator to 97 dBm unmodulated at 15 0050 MHz Tune receiver to 15 00500 MHz 5 While observing RF Voltmeter adjust C3 of A3A1 and C1 of A3A2 for a maximum meter reading of approximately 15 dBm 40 m V 6 Deenergize the receiver and disconnect test equipment 7 Replace the cover on the Input Converter A3 Install the Input Converter in chassis SIGNAL HF RECEIVER RF VOLTMETER GENERATOR RF RF ...

Page 193: ...Voltmeter reading NOTE If 36 dBm cannot be obtained adjust for maximum dBm reading Record this reading 7 Depress the 6 kHz IF Bandwidth button and adjust A4A1R39 for the same dBm reading obtained in step 6 8 Depress the 16 kHz IF Bandwidth button and adjust A4A1R39 for the same dBm reading obtained in step 6 9 Deenergize the receiver and disconnect test equipment 10 Install A4A2 and A4A1 into the ...

Page 194: ... set A4Al on extender card 3 Connect input of RF Voltmeter terminated in 50Q to TP2 4 Depress the 3 2 kHz Bandwidth button and adjust R26 for a 36 dBm reading 5 Depress the 6 kHz Bandwidth button and adjust R28 for a 36 dBm reading 6 Depress the 16 kHz Bandwidth button and adjust R30 for a 36 dBm reading SIGNAL RF GENERATOR WJ 8718 VOLTMETER RF OUT W16 P28 A4AI RFIN TPI TP2 Figure 4 20a Test Setup...

Page 195: ...MAINTENANCE 4 76b THIS PAGE LEFT BLANK WJ 8718 HF RECEIVER Courtesy of http BlackRadios terryo org ...

Page 196: ...tor for a 455 kHz output unmodulated at 80 dBm 6 Set the receiver controls as follows a b c d e f g h Meter Gain Mode Detection Mode RF Gain Phone Level IF Bandwidth Receiver Frequency BFO offset N A Manual N A Maximum Clockwise N A N A N A N A 7 Energize the receiver Adjust Sweep Generator Frequency control to center the response pattern on the Oscilloscope screen 8 Adjust A4A17L2 and A4A7L3 for ...

Page 197: ...7 A4A7 51 OSCILLOSCOPE VERT IN HOR IN SWEEP GENERATOR SWEEP RF OUT OUT 2 I SUMMER Figure 4 21 455 kHz Amplifier AM Detector Response Alignment Test Setup 5m sec em E Figure 4 22 455 kHz Amplifier AM Detector Response Alignment Typical Response 4 78 Courtesy of http BlackRadios terryo org ...

Page 198: ...0 mV scale 5 Set the Signal Generator to 15 0050 MHz unmodulated at 97 dBm 3 llV Also tune receiver to 15 00500 MHz 6 Adjust A4A7R7 for a 40 mV reading on the RF Voltmeter 7 Deenergize the receiver and disconnect test equipment SIGNAL HF RECEIVER RF VOLTMETER GENERATOR RF RF IF OUT INPUT OUT IN A2Jl J12 II elf 50 n RF PROBE Figure 4 23 455 kHz Amplifier AM Detector Gain Adjustment Test Setup 4 8 3...

Page 199: ... MHz and receiver detection mode to USB 9 Adjust potentiometer A4A4Rll until the meter reads the set level or until Rll is at its maximum setting whichever occurs first Record the meter level 10 Change the Signal Generator frequency to 15 0046 MHz and receiver detection mode to LSB 11 Adjust potentiometer A4A5Rll until the meter reads the level obtained in step 8 If the step 8 level cannot be obta...

Page 200: ... the Signal Generator output level until the Signal Strength meter reads the SET level 8 Change the Signal Generator frequency to 15 0054 MHz and receiver detec tion mode to USB 9 Adjust potentiometer A4A4R23 until the meter reads the set level or until Rll is at its maximum setting whichever occurs first Record the meter level 10 Change the Signal Generator frequency to 15 0046 MHz and receiver d...

Page 201: ...718 HF RECEIVER 13 Adjust potentiometer A4AR23 until the meter reads the level ob tained in step 10 14 Deenergize receiver and disconnect test equipment 4 80b PRODUCT IMPROVEMENT Courtesy of http BlackRadios terryo org ...

Page 202: ...his reading This is the Upper Sideband signal 7 Change the Signal Generator frequency to 15 0046 MHz 8 Connect the Oscilloscope to the ring on the phone jack This is the Lower Sideband signal 9 Adjust A4A8R8 to obtain the same output obtained in step 5 above or until output is at its maximum 10 If the same level as in step 5 cannot be obtained repeat steps 1 through 8 with the exception of lowerin...

Page 203: ...a 455 kHz output unmodulated at 25 dBm 7 Set the receiver controls as follows a b c d e f g h Meter Gain Mode Detection Mode RF Gain Phone Level IF Bandwidth Receiver Frequency BFO offset N A N A FM N A N A N A N A N A 8 Energize the receiver Adjust Sweep Generator Frequency control to center the response pattern on the Oscilloscope screen 9 Adjust A4A9L1 and A4A9T1 for an Oscilloscope waveform wh...

Page 204: ...A9 13 A4A9 57 OSCILLOSCOPE VERT IN HOR IN 2 1 SUMMER SWEEP GENERATOR SWEEP RF OUT OUT Figure 4 25 FM Discriminator Alignment Test Setup 5 m sec em l JI II I Ill I T 1 r II r II I I E Figure 4 26 FM Discriminator Alignment Typical Response 4 83 Courtesy of http BlackRadios terryo org ...

Page 205: ...he intensity of the front panel Frequency Display can be varied by potentiometer R2 which is located inside the front panel on the left side of the Frequency Display LED s Turning R2 clockwise increases the LED intensity 4 84 Courtesy of http BlackRadios terryo org ...

Page 206: ... The complete reference designations may be obtained by placing the proper prefix before the partial reference designations Reference Designation Prefixes are provided on drawings and illustrations in parentheses within the figure titles 5 3 LIST OF MANUFACTURERS Mfr Code 00779 01121 01295 02114 Inc Name and Address AM P Incorporated P O Box 3608 Harrisburg PA 17105 Allen Bradley Company 1201 Sout...

Page 207: ...oy Company 19505 Applied Engin Products Co 2021 W Valley View Lane Division of Samarious Inc Dallas TX 75234 300 Seymour Avenue Derby CT 06418 14632 Watkins Johnson Company 21604 The Buckeye Stamping Co 700 Quince Orchard Road 555 Marion Road Gaithersburg MD 20760 Columbus OH 43207 14655 Cornell Dubilier Electronics 25088 Siemens America Inc Div of Federal Pacific Electric Co 186 Wood Avenue 150 A...

Page 208: ...phia PA 19108 56289 Sprague Electric Company 75915 Littlefuse Incorporated Marshall Street 800 E Northwest Highway North Adams MA 01247 Des Plaines IL 60016 71279 Cambridge Thermionic Corp 80058 Joint Electronic Type 445 Concord Avenue Designation System Cambridge MA 02138 71400 Bussman Manuafacturing 80103 Lambda Electronics Corp Division of McGraw Edison Co Div of Veeco Instruments Inc 2536 W Un...

Page 209: ...cision Industries Delevan Electronics Division 270 Quaker Road East Aurora NY 14052 Wilco Corporation 4030 West 10th Street P O Box 22248 Indianapolis IN 46222 The parts list which follows contains all electrical parts used in the equipment and certain mechanical parts which are subject to unusual wear or damage When ordering replacement parts from Watkins Johnson Company specify the type and seri...

Page 210: ...oprietary products For this reason some transistors diodes and inte grated circuits installed in the equipment may not agree with those specified in the parts list and schematic diagrams of this manual However the semi conductors designated in the manual may be substituted in every case with satisfactory results 5 5 Courtesy of http BlackRadios terryo org ...

Page 211: ... Ceramic Disc 0 47 IF 20 50 V 2 34452 1 14632 C6 same as C5 C7 Capacitor Fixed Paper 0 01 IF 20 600 V 6 102P515 56289 C8 Thru same as C7 C12 C13 Capacitor Variable Ceramic 2 5 11 pF 350 V 1 538 011B2 5 11 72982 CR1 Diode 2 1N1614 80131 02735 CR2 same as CR1 E1 Terminal Standoff 3 7A1A1 92825 E2 same as E1 E3 same as E1 E4 Terminal Standoff 1 160 2381 01 05 00 71279 E5 Terminal Feedthru 4 SFU16Y 04...

Page 212: ...ow r 1 I u i I I I I 8 8 I _ _ 0 L _ 1 L e 1 I I I I I r MPI l JI3 MP6 MP4 MP5 MPI4 MPI5 MPI6 MPI7 MPI8 MPI2 MPI9 Figure 5 1 WJ 8718 HF Receiver Front Panel Location of Components DENOTES HIDDEN PARTS MP22 r JII U3 S2 RA3 TBI JI2 TB2 RI CR2 RA2 U2 XF2 F2 RAI UI MP23 CRI FI Figure 5 2 WJ 8718 HF Receiver Rear View Location of Components 5 7 Courtesy of http BlackRadios terryo org ...

Page 213: ...16 FA101BLK YEL 31918 MP7 Thru same as MP6 MP21 MP22 Handle Round Rear Panel 2 1012 12 88245 MP23 same as MP19 MP24 Cover Assembly Top Not Shown 1 51201 1 14632 MP25 Cover Assembly Bottom Not Shown 1 51201 2 14632 PI Connector Plug Part of WI P2 Connector Plug Part of WI P3 Connector Plug SMC Series Part of W2 7 UG1466 U 80058 19505 P4 same as P3 Part of W4 P5 same as P3 Part of W3 P6 Faston Recep...

Page 214: ... P35 P38 A4AIO P32 P37 P33 A4A9 P27 P51 A4A8 34 P3 A4A7 P30 P3I A5A2 P36 P50 A4A6 P2E4A5 WI6 A4A4 A3 A5AI A4A3 A6A2 P4 A5A3 P28 A6AI W4 P41 P42 P43 P44 J5 J3 J4 P45 DENOTES HIDDEN PART Figure 5 3 WJ 8718 HF Receiver Top View Location of Components 5 9 Courtesy of http BlackRadios terryo org ...

Page 215: ...me as P6 P34 Same as P6 P35 Same as P6 P36 Same as P6 P37 Not Used P38 Same as P6 P39 Same as P25 P40 Same as P25 P41 Same as P6 P42 Same as P6 P43 Same as P6 P44 Same as P6 P45 Same as P6 P46 Same as P6 P47 Same as P6 P48 Plug Assembly 1 34529 1 14632 P49 Same as P25 Part of W19 P50 Same as P6 Part of W20 P51 Same as P25 Part of W20 R1 Resistor Variable Composition 25 kQ 10 1 W 1 70A3L036L253A 01...

Page 216: ...ENOTES HIDDEN PARTS R2 J6 P8 PI5 WIO PI2 WI3 J8 PII W7 WI2 FLI EI v E2 P20 J2 E3 E4 W9 PI4 PI8 P48 C8 P23 WII PI6 PIO W6 J9 Figure 5 4 WJ 8718 HF Receiver Bottom View Location of Components 5 11 Courtesy of http BlackRadios terryo org ...

Page 217: ...2 W6 Cable Assembly 1 34701 5 14632 W7 Cable Assembly 1 34701 6 14632 W8 Not Used W9 Cable Assembly 1 34700 1 14632 W10 Cable Assembly 1 34700 2 14632 Wll Cable Assembly 1 34702 1 14632 W12 Cable Assembly 1 34700 3 14632 W13 Cable Assembly 1 34700 4 14632 W14 Cable Assembly 1 34700 5 14632 W15 Cable Assembly 1 34702 2 14632 W16 Cable Assembly 1 34701 7 14632 W17 Cable Assembly 1 380005 1 14632 W18...

Page 218: ...G025HP4 56289 25 V C2 same as C1 C3 Capacitor Electrolytic Aluminum 8000 llF 10 75 2 39D808G015JT4 56289 15 V C4 same as C3 CR1 Diode 4 1N4998 80131 04713 CR2 Thru same as CR1 CR4 J1 Faston Tab 20 62073 1 00779 J2 Thru same as J1 J14 J15 Thru Not Used J18 J19 same as J1 J20 same as J1 J21 same as J1 J22 Thru Not Used J30 J31 same as J1 J32 same as J1 J33 Not Used J34 Not Used J35 same as J1 5 13 C...

Page 219: ...FIGURE 5 5 WJ 8718 HF RECEIVER Figure 5 5 Type 76240 Power Distribution AI Location of Components 5 14 Courtesy of http BlackRadios terryo org ...

Page 220: ...49 72136 C12 Capacitor Mica Dipped 200 pF 2 500 V 2 CM05FD201G03 81349 72136 C13 Capacitor Mica Dipped 220 pF 2 500 V 1 CM05FD22lG03 81349 72136 C14 Same as Cll C15 Same as C12 C16 Capacitor Mica Dipped 120 pF 2 500 V 1 CM05FD121G03 81349 72136 C17 Capacitor Mica Dipped 47 pF 2 500 V 1 CM05ED470G03 81349 72136 CR1 Diode 2 1N4449 80131 93332 CR2 Same as CR1 E1 Connector Termination 1 144 188 19505 ...

Page 221: ...IVER C4 C5 C6 C7 T C8 C9 CI0 i n r 1 CII C12 i L5 CI3 CI4 C15 L7 __ e EI CI6 CI RI JI LI L2 L3 VR2 VRI L6 r CR I CR2 CI7 L8 5 15A Figure 5 6 Type 791616 RF Filter A2 Location of Components Courtesy of http BlackRadios terryo org ...

Page 222: ...1 30 MHz Low Pass Filter 1 280093 14632 E1 Connector Termination 1 144 188 19505 J1 Connector Receptacle BNC Series 1 UG1094 U 80058 74868 L1 Coil Toroidal 1 20681 208 14632 P1 Connector Plug SMC Series 1 UG1466 U 80058 19505 PI r AI JI Figure 5 6A Type 791616 Input Filter Product Improvement A2 Location of Components 5 15B Courtesy of http BlackRadios terryo org ...

Page 223: ... 500 V 3 CM05FDl51G03 81349 72136 C7 Capacitor Mica Dipped 39 pF 2 500V 1 CM05ED390G03 81349 72136 C8 same as C6 C9 Capacitor Mica Dipped 18 pF 5 500 V 1 CM05CDl80G03 81349 72136 C10 Same as C6 C11 same as Cl C12 Capacitor Ceramic Disc 47 pF 5 100 V 1 8111 100COGO 470J 72982 CR1 Diode 2 IN4449 80131 93332 CR2 same as CR1 Ll Coil Variable 0 351 0 429 jJH 4 558 7107 08 71279 L2 same as L1 L3 same as...

Page 224: ...WJ 8718 HF RECEIVER THIS PAGE LEFT BLANK 5 15D Courtesy of http BlackRadios terryo org ...

Page 225: ...14632 A2 2nd Mixer 2nd IF 1 34749 14632 A3 Filter Board 1 280080 14632 C1 Capacitor Ceramic Feedthru 1000 pF GMV 500 V 4 54 794 009 102W 33095 C2 Thru Same as C1 C4 L1 Coil Fixed 1 8 JH 1 1537 18 99800 PI Connector Plug HDP 20 1 205204 1 00779 C3 C4 K t A2 1I r1r A3 r i 4 L I JIF AI 5 16 Figure 5 7 Type 791592 1 Input Converter A3 Location of Components Courtesy of http BlackRadios terryo org ...

Page 226: ... L1 Coil Fixed 10 llH 2 1537 36 99800 L2 same as L1 Q1 Transistor 1 2N2222A 80131 04713 Q2 Transistor 1 CP643 12498 R1 Resistor Fixed Composition 2 2 kn 5 1 4 W 1 RCR07G222JS 81349 01121 R2 Resistor Fixed Composition 82 n 5 1 4 W 1 RCR07G820JS 81349 01121 R3 Resistor Fixed Composition 10 n 5 1 4 W 1 RCR07G100JS 81349 01121 R4 Resistor Fixed Composition 150 n 5 1 8 W 1 RCR05G151JS 81349 01121 RA1 H...

Page 227: ...FIGURE 5 9 WJ 8718 HF RECEIVER Figure 5 9 Part 34749 2nd Mixer 2nd IF Amplifier A3A2 Location of Components 5 18 Courtesy of http BlackRadios terryo org ...

Page 228: ...FB1 Ferrite Bead 3 56 590 65 4A 02114 FB2 Same as FB1 FB3 Same as FB1 FL1 Filter Bandpass 10 7 MHz CF 16 kHz BW 1 92124 14632 J1 Connector Receptacle SMC Series 2 34520 1 14632 J2 Same as J1 L1 Coil Fixed 10 IH 4 1537 36 99800 L2 Same as L1 L3 Same as L1 L4 Coil Fixed 0 56 IH 1 202 11 99848 L5 Same as L1 Q1 Transistor 1 2N2222A 80131 04713 Q2 Transistor 1 CP643 12498 Q3 Transistor 3 2N5109 80131 0...

Page 229: ...349 01121 R17 Same as R8 R18 Same as R3 R19 Resistor Fixed Composition 22 n 5 1 4 W 1 RCR07G220JS 81349 01121 R20 Same as R5 R21 Resistor Fixed Composition 560 n 5 1 4 W 1 RCR07G561JS 81349 01121 R22 Resistor Fixed Composition 150 n 5 1 4 W 2 RCR07G151JS 81349 01121 R23 Resistor Fixed Composition 15 n 5 1 4 W 1 RCR07G150JS 81349 01121 R24 Same as R8 R25 Resistor Fixed Composition 470 n 5 1 4 W 1 R...

Page 230: ... QTY MANUFACTURER S MFR RECM DESCRIPTION PER DESIG ASSY PART NO CODE VENDOR C1 Capacitor Variable Ceramic 9 35 pF 350 V 1 538 011D9 35 72982 L1 Coil Fixed 0 33 H 1 1537 04 99800 o E2 Figure 5 10 Part 280080 Filter Board A3A3 Location of Components 5 21 Courtesy of http BlackRadios terryo org ...

Page 231: ... A7 455 kHz Amplifier AM Detector 1 72488 14632 A8 ISB Detector Audio 1 791598 14632 A9 FM CW SSB Detector 1 791599 14632 A10 Audio Amplifier 1 7459 14632 All Spare C1 Capacitor Ceramic Disc 0 01 jlF 20 50 V 29 34453 1 14632 C2 Thru same as C1 C29 J1 Feedthru Post 2 PE914031 2 00779 J2 same as J1 L1 Ferrite Choke 2 VK200 10 3B 02114 L2 same as L1 MP1 Housing P C Connector 11 117798 3 00779 MP2 Thr...

Page 232: ...WJ 8718 XA1 Pl XA2 SEE CAPACITOR DETAIL XA3 XA4 Figure 5 11 l _ j y Cl THRU C29 Figure 5 11 Type 791569 IF Motherboard A4 Location of Components 5 23 Courtesy of http BlackRadios terryo org ...

Page 233: ...800 L2 Coil Fixed 2 2 JlH 1 1537 20 99800 L3 Coil Fixed 1 8 JlH 1 1537 18 99800 Q1 Transistor 3N187 6 841001 1 14632 Q2 Thru Same as Q1 Q6 R1 Resistor Fixed Composition 10 kQ 5 1 4 W 10 RCR07Gl03JS 81349 01121 R2 Resistor Fixed Composition 1 2 kQ 5 1 4 W 3 RCR07Gl22JS 81349 01121 R3 Resistor Fixed Composition 470 kn 5 1 4 W 9 RCR07G474JS 81349 01121 R4 Resistor Fixed Composition 820 n 5 1 4 W 2 RC...

Page 234: ...FIGURE 5 12 WJ 8718 HF RECEIVER Figure 5 12 Type 791594 10 7 MHz Filter Switch A4A1 Location of Components 5 26 Courtesy of http BlackRadios terryo org ...

Page 235: ...3 R32 Same as R14 R33 Same as R14 R34 Resistor Fixed Composition 180 n 5 1 4 W 2 RCR07Gl81JS 81349 01121 R35 Not Used R36 Same as R5 R37 Same as R6 R38 Resistor Fixed Composition 200 n 5 1 4 W 1 RCR070201JS 81349 01121 R39 Same as R7 R40 Same as R3 R41 Same as R1 R42 Same as R3 R43 Same as R5 R44 Same as R14 R45 Same as R34 R46 Same as R2 R47 Thru Same as R1 R49 R50 Resistor Fixed Composition 1 0 ...

Page 236: ... C2 C23 C24 same as C9 C25 same as C9 C26 same as C9 C27 Capacitor Electrolytic Tantalum 15 IlF 10 20 V 2 CS13BE156K 81349 56289 C28 same as C2 C29 same as C2 C30 Capacitor Mica Dipped 130 pF 2 500 V 1 CM05FDl31G03 81349 72136 C31 same as C27 FLI Filter Bandpass 1 92126 14632 FL2 Filter Bandpass 1 92125 14632 L1 Coil Fixed 1 IlH 1 1537 12 99800 L2 Not Used L3 Not Used L4 Coil Fixed 8 2 IlH 1 1537 ...

Page 237: ...8 Same as R10 R19 Resistor Fixed Composition 1 2 k51 5 1 4 W 1 RCR07G122JS 81349 01121 R20 Same as R12 R21 Same as R13 R22 Same as R13 R23 Resistor Fixed Composition 56051 5 1 4 W 4 RCR07G561JS 81349 01121 R24 Same as R13 R25 Resistor Fixed Composition 100 51 5 1 4 W 6 RCR07G101JS 81349 01121 R26 Resistor Variable Film 200 51 10 1 2 W 3 62PR200 73138 R27 Same as R25 R28 Same as R26 R29 Same as R25...

Page 238: ...Resistor Fixed Composition 56 n 5 1 4 W 1 RCR07G560JS 81349 01121 R52 Resistor Fixed Composition 33 kn 5 1 4 W 1 RCR07G333JS 81349 01121 R53 Resistor Fixed Composition 6 2 kn 5 1 4 W 1 RCR07G622JS 81349 01121 R54 Resistor Fixed Composition 10 kn 5 1 4 W 3 RCR07G103JS 81349 01121 R55 Same as R54 R56 Same as R54 U1 Integrated Circuit 2 MC1458N 18324 U2 Same as U1 Figure 5 12A Type 791594 10 7 MHz Fi...

Page 239: ...WJ 8718 HF RECEIVER THIS PAGE LEFT BLANK REPLACEMENT PARTS LIST 5 27D Courtesy of http BlackRadios terryo org ...

Page 240: ...FIGURE 5 13 WJ 8718 HF RECEIVER Figure 5 13 Type 71430 10 7 MHz 455 kHz Converter A4A2 Location of Components 5 28 Courtesy of http BlackRadios terryo org ...

Page 241: ... Fixed 3 3 I1H 1 1537 24 99800 L3 Coil Fixed 12 I1H 1 1537 38 99800 L4 Coil Fixed 8211H 1 1537 72 99800 Q1 Transistor 1 2N2708 80131 18714 R1 Resistor Fixed Composition 56 Q 5 1 4 W 2 RCR07G560JS 81349 01121 R2 Same as R1 R3 Resistor Fixed Composition 1 0 kQ 5 1 4 W 1 RCR07G102JS 81349 01121 R4 Resistor Fixed Composition 12 kQ 5 1 4 W 1 RCR07G123JS 81349 01121 R5 Resistor Fixed Composition 4 7 kQ ...

Page 242: ...FIGURE 5 14 WJ 8718 HF RECEIVER Figure 5 14 Type 791595 455 kHz Filter Switch A4A3 Location of Components 5 30 Courtesy of http BlackRadios terryo org ...

Page 243: ...49 01121 R3 Resistor Fixed Composition 270 Q 5 1 4 W 3 RCR07G271JS 81349 01121 R4 Resistor Fixed Composition 1 2 kQ 5 1 4 W 3 RCR07G122JS 81349 01121 R5 Resistor Fixed Composition 22 Q 5 1 4 W 3 RCR07G220JS 81349 01121 R6 Same as R5 R7 Resistor Fixed Composition 12 kQ 5 1 4 W 3 RCR07G123JS 81349 01121 R8 Resistor Fixed Composition 1 5 kQ 5 1 4 W 3 RCR07G152JS 81349 01121 R9 Resistor Fixed Composit...

Page 244: ... R30 Same as R4 R31 Same as R3 R32 Same as RIO R33 Same as R7 R34 Same as R8 R35 Same as R9 R36 Same as R14 R37 Same as R14 R38 Resistor Fixed Composition 4 7 kQ 5 1 4 W 1 RCR07G472JS 81349 01121 R39 Same as R12 R40 Same as R14 Ul Integrated Circuit 1 MC3403P 04713 Figure 5 15 Type 791596 USB Filter Switch A4A4 Location of Components 5 32 Courtesy of http BlackRadios terryo org ...

Page 245: ...Resistor Fixed Composition 10 kn 5 1 4 W 6 RCR07G103JS 81349 R2 Resistor Fixed Composition 470 kn 5 1 4 W 3 RCR07G474JS 81349 01121 R3 Same as R1 R4 Resistor Fixed Composition 10 n 5 1 4 W 2 RCR07G100JS 81349 01121 R5 Resistor Fixed Composition 22 n 5 1 4 W 3 RCR07G220JS 81349 01121 R6 Resistor Fixed Composition 1 2 kn 5 1 4 W 1 RCR07G122JS 81349 01121 R7 Resistor Fixed Composition 68 n 5 1 4 W 3 ...

Page 246: ...istor Fixed Composition 4 7 kn 5 1 4 W 2 RCR07G472JS 81349 01121 R3 Resistor Fixed Composition 270 n 5 1 4 W 1 RCR07G271JS 81349 01121 R4 Resistor Fixed Composition 10 n 5 1 4 W 2 RCR07GlOOJS 81349 01121 R5 Resistor Fixed Composition 22 n 5 1 4 W 3 RCR07G220JS 81349 01121 R6 same as R5 R7 Resistor Fixed Composition 1 2 kn 5 1 4 W 2 RCR07Gl22JS 81349 01121 R8 same as R7 R9 same as R4 RIO Resistor F...

Page 247: ...ER DESIG ASSY PART NO CODE VENDOR R24 Resistor Fixed Composition 220 n 5 1 4 W 1 RCR07G221JS 81349 01121 Ul Integrated Circuit 1 MC1458N 18324 FLI 42 791596 0 20 o C Figure 5 15A Type 791596 USB Filter Switch Product Improvement A4A4 Location of Components 5 33B Courtesy of http BlackRadios terryo org ...

Page 248: ...FIGURE 5 16 WJ 8718 HF RECEIVER Figure 5 16 Type 791597 ISB LSB Filter Switch A4A5 Location of Components 5 34 Courtesy of http BlackRadios terryo org ...

Page 249: ...001 1 14632 Q2 Same as Ql Q3 Same as Ql Rl Resistor Fixed Composition 10 kQ 5 1 4 W 10 RCR07GI03JS 81349 01121 R2 Resistor Fixed Composition 470 kQ 5 1 4 W 5 RCR07G474JS 81349 01121 R3 Same as Rl R4 Resistor Fixed Composition 10 Q 5 1 4 W 3 RCR07GI00JS 81349 01121 R5 Resistor Fixed Composition 22 Q 5 1 4 W 3 RCR07G220JS 81349 01121 R6 Resistor Fixed Composition 1 2 kQ 5 1 4 W 1 RCR07G122JS 81349 0...

Page 250: ... PART NO CODE VENDOR R22 same as R1 R23 same as R2 R24 same as R7 R25 same as R4 R26 Thru same as R1 R30 R31 Resistor Fixed Composition 200 n 5 1 4 W 1 RCR07G201JS 81349 01121 FLI Figure 5 16A Type 791597 ISB LSB Filter Switch Product Improvement Location of Components 5 36 Courtesy of http BlackRadios terryo org ...

Page 251: ... 5 1 4 W 6 RCR07GI03JS 81349 01121 R2 Resistor Fixed Composition 3 9 kn 5 1 4 W 1 RCR07G392JS 81349 01121 R3 Resistor Fixed Composition 1 kn 5 1 4 W 1 RCR07GI02JS 81349 01121 R4 Resistor Fixed Composition 10 n 5 1 4 W 3 RCR07GI00JS 81349 01121 R5 Resistor Fixed Composition 270 n 5 1 4 W 1 RCR07G271JS 81349 01121 R6 Resistor Fixed Composition 22 n 5 1 4 W 4 RCR07G220JS 81349 01121 R7 Same as R6 R8 ...

Page 252: ...stor Fixed Composition 24 k 5 1 4 W 1 RCR07G243JS 81349 01121 R25 Same as R18 R26 Same as R21 R27 Same as R9 R28 Same as RIO R29 Same as R12 R30 Same as R4 R31 Same as R1 R32 Resistor Variable Film 2 k 10 1 2 W 1 62PR2K 73138 R33 Resistor Fixed Composition 220 5 1 4 W 1 RCR07G22lJS 81349 01121 U1 Integra ted Circuit 1 MC1458N 18324 Figure 5 17 Type 78112 AGC Amplifier A4A6 Location of Components 5...

Page 253: ...esistor Fixed Composition 470 kn 5 1 4 W 2 RCR07G474JS 81349 01121 R4 Resistor Fixed Composition 100 n 5 1 4 W 5 RCR07G101JS 81349 01121 R5 same as R1 R6 Resistor Fixed Composition 330 kn 5 1 4 W 1 RCR07G334JS 81349 01121 R7 Resistor Fixed Composition 6 8 kn 5 1 4 W 4 RCR07G682JS 81349 01121 R8 same as R4 R9 Resistor Fixed Composition 15 kn 5 1 4 W 4 RCR07G153JS 81349 01121 RIO Resistor Fixed Comp...

Page 254: ... R35 same as Rll R36 Resistor Fixed Composition 68 kn 5 1 4 W 3 RCR07G683JS 81349 01121 R37 Same as Rl R38 same as R36 R39 same as R36 R40 same as Rl R41 same as R7 R42 same as R4 R43 same as R2 R44 Not Used R45 same as Rll R46 Resistor Fixed Composition 39 kn 5 1 4 W 1 RCR07G393JS 81349 01121 R47 Resistor Fixed Composition 820 n 5 1 4 W 1 RCR07G821JS 81349 01121 R48 Resistor Fixed Composition 68 ...

Page 255: ...s C3 C29 Capacitor Electrolytic Tantalum 15 F 10 20 V 1 CS13BE156K 81349 56289 C30 Same as Cl CRI Diode 5 IN4449 80131 93332 CR2 Thru Same as CRI CR5 Ll Coil Fixed 6 8 mH 5 553 3635 47 71279 L2 Coil Variable 39 H 2 558 7107 32 71279 L3 Same as L2 L4 Thru Same as Ll L7 Ql Transistor 3N187 2 841001 1 14632 Q2 Same as Ql Q3 Transistor 4 2N2222A 80131 04713 Q4 Thru Same as Q3 Q6 Rl Resistor Fixed Comp...

Page 256: ...FIGURE 5 18 Cil 5 40 o Figure 5 18 Type 72488 455 kHz Amplifier AM Detector A4A7 Location of Components WJ 8718 HF RECEIVER Courtesy of http BlackRadios terryo org ...

Page 257: ...1 Same as R9 R22 Resistor Fixed Composition 12 kQ 5 1 4 W 1 RCR07Gl23JS 81349 01121 R23 Resistor Fixed Composition 4 7 kn 5 1 4 W 1 RCR07G472JS 81349 01121 R24 Resistor Fixed Composition 22 Q 5 1 4 W 1 RCR07G220JS 81349 01121 R25 Resistor Fixed Composition 470 n 5 1 4 W 1 RCR07G471JS 81349 01121 R26 Resistor Fixed Composition 15 n 5 1 4 W 1 RCR07G150JS 81349 01121 R27 Resistor Fixed Composition 15...

Page 258: ...FIGURE 5 19 WJ 8718 HF RECEIVER Figure 5 19 Type 791598 ISS Detector Audio A4A8 Location of Components 5 42 Courtesy of http BlackRadios terryo org ...

Page 259: ...CRI Ll Coil Fixed 6 8 mH 2 553 3635 47 71279 L2 Same as Ll L3 Coil Fixed 47 mH 1 553 3635 57 71279 Ql Transistor 2 841001 1 14632 Q2 Same as Ql Q3 Transistor 2 2N2907 JAN 81350 04713 Q4 Transistor 1 2N2222A 80131 04713 Q5 Same as Q3 Rl Resistor Fixed Composition 3 9 kQ 5 1 4 W 4 RCR07G392JS 81349 01121 R2 Resistor Fixed Composition 120 kQ 5 1 4 W 2 RCR07G124JS 81349 01121 R3 Resistor Fixed Composi...

Page 260: ... R28 same as R1 R29 same as R14 R30 same as R4 R31 Resistor Fixed Composition 330 kQ 5 1 4 W 1 RCR07G334JS 81349 01121 R32 same as R14 R33 Resistor Fixed Composition 12 kQ 5 1 4 W 1 RCR07G123JS 81349 01121 R34 Resistor Fixed Composition 1 0 MQ 5 1 4 W 2 RCR07G105JS 81349 01121 R35 same as R34 R36 Resistor Variable Film 25 kQ 10 1 2 W 1 62PAR25K 73138 R37 same as R19 R38 Not Used R39 same as R14 R4...

Page 261: ... Film 100 kQ 1 1 10 W 1 RN55C1003F 81349 75042 R57 same as R21 R58 same as R7 R59 same as R7 R60 same as R21 R61 same as R19 R62 same as R24 R63 Resistor Fixed Composition 220 Q 5 1 4 W 1 RCR07G221JS 81349 01121 R64 same as R46 R65 same as R43 R66 Resistor Fixed Composition 68 kQ 5 1 4 W 1 RCR07G683JS 81349 01121 R67 same as R46 R68 same as R47 T1 Transformer 1 LL010 07388 V1 Integrated Circuit 1 ...

Page 262: ...FIGURE 5 20 8 HF RECEIVER WJ 871 5 46 Figure 5 20 MA9 d SSB Detector 791599 FM CW an Type f Components LocatIOn 0 Courtesy of http BlackRadios terryo org ...

Page 263: ...79 L3 Same as L2 Ql Transistor 2 2N2907 JAN 81350 04713 Q2 Transistor 2 2N2222A 80131 04713 Q3 Same as Q1 Q4 Same as Q2 Rl Resistor Fixed Composition 10 kn 5 1 4 W 4 RCR07GI03JS 81349 01121 R2 Resistor Fixed Composition 1 0 kn 5 1 4 W 3 RCR07GI02JS 81349 01121 R3 Resistor Fixed Composition 220 n 5 1 4 W 1 RCR07G221JS 81349 01121 R4 Resistor Fixed Composition 47 n 5 1 4 W 3 RCR07G470JS 81349 01121 ...

Page 264: ...ion 150 n 5 1 4 W 1 RCR07G151JS 81349 01121 R25 Resistor Fixed Composition 5 6 kn 5 1 4 W 1 RCR07G562JS 81349 01121 R26 Same as R5 R27 Same as R6 R28 Same as R4 R29 Resistor Fixed Composition 82 kn 5 1 4 W 2 RCR07G823JS 81349 01121 R30 Same as R14 R31 Same as R4 R32 Same as R29 R33 Same as R14 R34 Same as R6 R35 Same as R5 R36 Same as R23 R37 Same as R8 R38 Same as R1 1 1 Transformer 1 30312 257 1...

Page 265: ...Dipped 24 pF 5 500 V 1 CM05ED240J03 81349 72136 CR1 Diode 1 1N4449 80131 93332 CR2 Diode 2 1N198A 80131 93332 CR3 same as CR2 CR4 Diode 1 1N4003 80131 04713 Q1 Transistor 1 U1899E 15818 Q2 Transistor 1 TIP 29 01295 R1 Resistor Fixed Composition 22 kQ 5 1 4 W 3 RCR07G223JS 81349 01121 R2 Resistor Fixed Composition 330 kQ 5 1 4 W 2 RCR07G334JS 81349 01121 R3 Resistor Fixed Composition 47 kQ 5 1 4 W ...

Page 266: ...FIGURE 5 21 WJ 8718 HF RECEIVER Figure 5 21 Type 7459 Audio Amplifier A4A10 Location of Components 5 50 Courtesy of http BlackRadios terryo org ...

Page 267: ...ame as R7 R19 Same as R6 R20 Same as R9 R21 Same as R9 R22 Resistor Fixed Composition 100 rI 5 1 4 W 2 RCR07G101JS 81349 01121 R23 Same as Rl R24 Same as R14 R25 Not Used R26 Not Used R27 Same as R22 R28 Resistor Fixed Composition 220 rI 5 1 4 W 1 RCR07G221JS 81349 01121 RAI Heatsink 1 24566 1 14632 Tl Transformer 1 LLOI0 07388 Ul Integrated Circuit 1 MC3403P 04713 U2 Integrated Circuit 1 LM378N 2...

Page 268: ... 14632 C2 Thru same as Cl C58 C59 Capacitor Ceramic Disc 0 47 IlF 20 50 V 4 34452 14632 C60 same as C59 C61 same as C59 C62 same as C59 Jl Faston Tabs 3 62073 1 00779 J2 same as Jl J3 same as Jl Ll Ferrite Choke 4 VK200 10 3B 02114 L2 Thru same as Ll L4 MPI Housing P C Connector 5 117798 3 00779 MP2 Thru same as MPI MP5 MP6 Insulator Mica 2 B05608AOOI 04713 MP7 same as MP6 Cable Assembly 1 34832 1...

Page 269: ...WJ 8718 t i_P_I I _ P 2__ CAPACITORS SHOWN ON SIDE VIEW Figure 5 22 Figure 5 22 Type 791570 Synthesizer Motherboard A5 Location of Components 5 53 Courtesy of http BlackRadios terryo org ...

Page 270: ...89 C5 Capacitor Electrolytic Tantalum 47 IF 20 20 V 2 196D476X0020PE4 56289 C6 Same as C2 C7 Same as C5 C8 Same as C4 CR1 Diode 3 1N4449 80131 93332 CR2 Same as CR1 CR3 Same as CR1 FBI Ferrite Bead 17 56 590 65 4A 02114 FB2 Thru Same as FBI FB17 L1 Coil Fixed 10 mH 2 553 3635 49 71279 L2 Coil Fixed 0 82 lH 1 1537 10 99800 L3 Same as L1 L4 Coil Fixed 4 7 mH 1 553 3635 45 71279 R1 Resistor Fixed Com...

Page 271: ...A2 C3 C6 C8 L4 F85 F86 F87 F88 L _ _ F83 F84 AI VRI R2 R3 CR2 CR3 WJ 8718 HF RECEIVER C4 R4 L3 L2 L _ _ _ _ LI RI DENOTES HIDDEN PART Figure 5 23 Type 791630 1st and 3rd LO Synthesizer Timebase A5A1 Location of Components 5 56 Courtesy of http BlackRadios terryo org ...

Page 272: ... Tantalum 68 IF 20 15 V 1 183DR686XOO15F 56289 C6 Same as C1 E1 Connector Termination 1 144 188 19505 PI Connector Plug SMC Series 1 UG1465 U 80058 19505 P2 Connector Plug SMC Series 1 UG1466 U 80058 19505 R1 Resistor Fixed Composition 1 2 kQ 5 1 8 W 3 RCR05G122JS 81349 01121 R2 Same as R1 R3 Same as R1 R4 Resistor Fixed Composition 47 Q 5 1 8 W 1 RCR05G470JS 81349 01121 EI P2 C6 PI 1iill t F C5 t...

Page 273: ...1 C14 Capacitor Ceramic Disc 470 pF 20 1000 V 7 B470PFM 91418 CIS Capacitor Mica Dipped 100 pF 2 500 V 1 CM04FD10lG03 81349 72136 C16 Same as C1 C17 Same as C1 C18 Capacitor Electrolytic Tantalum 2 2 llF 10 20 V 1 CS13BE225K 81349 56289 C19 Same as C14 C20 Same as C14 C21 Same as C14 C22 Not Used C23 Same as C14 C24 Not Used C25 Same as C14 C26 Capacitor Ceramic Disc 5000 pF 20 100 V 2 C023B101E50...

Page 274: ...sition 220 Q 5 1 8 W 1 RCR05G221JS 81349 01121 RIO Resistor Fixed Composition 68 Q 5 1 8 W 2 RCR05G680JS 81349 01121 R11 Resistor Fixed Composition 180 Q 5 1 8 W 1 RCR05G181JS 81349 01121 R12 Same as RIO R13 Same as R6 R14 Same as R7 R15 Resistor Fixed Composition 47 Q 5 1 8 W 4 RCR05G470JS 81349 01121 R16 Same as R8 R17 Resistor Fixed Composition 150 Q 5 1 8 W 1 RCR05Gl51JS 81349 01121 R18 Resist...

Page 275: ...37 Same as R4 R38 Not Used R39 Not Used R40 Resistor Fixed Composition 51 n 5 1 4 W 1 RCR07G51O S 81349 01121 T1 Part of PC Board T2 Transformer Toroidal 2 21278 23 14632 T3 Same as T2 T4 Transfor mer Toroidal 2 21278 27 14632 T5 Not Used T6 Same as T4 Ul Integrated Circuit 1 MC1697P 04713 Figure 5 25 Part 34750 1st W Voltage Controlled Oscillator A5AlAlA1 Location of Components 5 60 Courtesy of h...

Page 276: ... Ceramic Disc 1000 pF GMV 500 V 1 SM1000PFP 91418 C23 Capacitor Mica Dipped 820 pF 5 300 V 1 DM15 821J 72136 C24 Not Used C25 Same as C16 C26 Same as C16 C27 Not Used C28 Capacitor Ceramic Tubular 47 pF 5 500 V 1 308 000COGO 470J 72982 C29 Capacitor Electrolytic Tantalum 100 IF 20 10 V 1 196Dl07X0010LA3 56289 C30 Capacitor Electrolytic Tantalum 2 2 IF 20 35 V 1 196D225X0035JE3 56289 C31 Same as C1...

Page 277: ...FIGURE 5 26 5 62 Figure 5 26 Type 791600 1st and 3rd LO Synthesizer A5A1A2 Location of Components WJ 8718 HF RECEIVER Courtesy of http BlackRadios terryo org ...

Page 278: ... Same as Q8 Q10 Same as Q6 R1 Resistor Fixed Composition 100 Q 5 1 4 W 6 RCR07G101JS 81349 01121 R2 Resistor Fixed Composition 470 Q 5 1 4 W 4 RCR07G471JS 81349 01121 R3 Same as R2 R4 Resistor Fixed Composition 82 kQ 5 1 8 W 4 RCR05G823JS 81349 01121 R5 Same as R4 R6 Resistor Fixed Composition 5 6 kQ 5 1 4 W 4 RCR07G562JS 81349 01121 R7 Same as R6 R8 Resistor Fixed Composition 100 kQ 5 1 4 W 1 RCR...

Page 279: ...ition 1 0 kQ 5 1 4 W 15 RCR07G102JS 81349 01121 R44 Same as R2 R45 Same as R36 R46 Same as R40 R47 Same as R40 R48 Same as R43 R49 Resistor Fixed Composition 330 Q 5 1 4 W 1 RCR07G331JS 81349 01121 R50 Same as R24 R51 Same as R43 R52 Same as R43 R53 Same as R24 R54 Resistor Fixed Composition 22 Q 5 1 4 W 3 RCR07G220JS 81349 01121 R55 Resistor Fixed Composition 27 51 5 1 4 W 1 RCR07G270JS 81349 011...

Page 280: ... 14632 U1 Integrated Circuit 1 MCI2013L 04713 U2 Integrated Circuit 1 SN74LSI96N 01295 U3 Integrated Circuit 1 MCI2014L 04713 U4 Integrated Circuit 1 841013 14632 U5 Integrated Circuit 2 MC4044P 04713 U6 Integrated Circuit 1 SN74LSOON 01295 U7 Integrated Circuit 1 CA6741T 02735 U8 Integrated Circuit 3 SN74LS190N 01295 U9 Integrated Circuit 6 SN74LS196N 01295 UIO Same as U8 U11 Same as U8 U12 Integ...

Page 281: ...UFACTURER S MFR RECM DESCRIPTION PER DESIG ASSY PART NO CODE VENDOR VR1 Voltage Regulator 1 78M05HC 02763 Y1 Crystal Quartz 1 CR64U11 155 MHz 80058 74306 Figure 5 27 Type 791601 2nd LO Synthesizer A5A2 Location of Components 5 66 Courtesy of http BlackRadios terryo org ...

Page 282: ...amic Disc 0 01 jlF 20 50 V 17 34453 1 14632 C12 same as Cll C13 same as C10 C14 same as C4 C15 same as C4 C16 Capacitor Ceramic Disc 470 pF 20 1000 V 3 B470PFM 91418 C17 Capacitor Electrolytic Tantalum 150 jlF 20 6 V 1 196Dl57XOO06PE4 56289 C18 same as C5 C19 same as Cl1 C20 same as Cl1 C21 same as Cl1 C22 Capacitor Ceramic Tubular 10 pF 0 5 pF 500 V 1 301 000COHO 100D 72982 C23 Capacitor Mica Dip...

Page 283: ...ular 5 6 pF 0 5 pF 500 V Capacitor Mica Dipped 150 pF 2 500 V Capacitor Ceramic Tubular 4 7 pF 0 1 pF 500 V Capacitor Ceramic Tubular 2 2 pF 0 25 pF 500 V Capacitor Ceramic Tubular 15 pF 5 500 V Capacitor Mica Dipped 1000 pF 5 100 V Same as C36 Same as C1 Capacitor Ceramic Disc 100 pF 2 500 V Diode LED Diode Diode Varicap Same as CR3 Same as CR3 Same as CR1 Coil Fixed Molded 0 47 1H Coil Fixed Mol...

Page 284: ... 7 RCR07G100JS 81349 01121 R6 Resistor Fixed Composition 1 0 kn 5 1 4 W 13 RCR07G102JS 81349 01121 R7 Resistor Fixed Composition 1 2 kn 5 1 4 W 1 RCR07G122JS 81349 01121 R8 same as R5 R9 same as R6 RIO Resistor Fixed Composition 5 6 n 5 1 4 W 1 RCR07G5R6JS 81349 01121 R11 Resistor Fixed Composition 5 1 kn 5 1 4 W 1 RCR07G512JS 81349 01121 R12 same as R6 R13 same as R5 R14 same as R6 R15 Resistor F...

Page 285: ...tion 470 n 5 1 4 W 5 RCR07G471JS 81349 01121 R41 Same as R6 R42 Resistor Fixed Composition 10 kn 5 1 4 W 4 RCR07Gl03JS 81349 01121 R43 Not Used R44 Resistor Fixed Composition 47 kn 5 1 4 W 1 RCR07G473JS 81349 01121 R45 Not Used R46 Resistor Fixed Composition 1 5 kn 5 1 4 W 1 RCR07G152JS 81349 01121 R47 Resistor Fixed Composition 750 n 5 1 4 W 1 RCR07G751JS 81349 01121 R48 Same as R15 R49 Same as R...

Page 286: ...713 U2 Integra ted Circuit 1 868281 14632 U3 Integrated Circuit 1 SN74S74N 01295 U4 Integrated Circuit 1 MC1496 04713 U5 lntegrated Circuit 1 N5733K 18324 U6 Same as U1 U7 lntegrated Circuit 1 SN74LS190N 01295 U8 Integrated Circuit 3 SN74LS191N 01295 U9 Same as U8 U10 Same as U8 U11 Integrated Circuit 2 SN74LSOON 01295 U12 Same as U1 013 Not Used U14 Integrated Circuit 1 SN74LS168N 01295 U15 Integ...

Page 287: ...FIGURE 5 28 WJ 8718 HF RECEIVER Figure 5 28 Type 791576 BFO Synthesizer A5A3 Location of Components 5 72 Courtesy of http BlackRadios terryo org ...

Page 288: ... C13 same as C5 C14 same as C10 C15 Not Used C16 same as C3 C17 Thru same as C5 C21 C22 same as C3 C23 same as C5 CR1 Diode Varicap 1 BB109 YELLOW 25088 L1 Coil Fixed 27 H 1 1537 48 99800 L2 Coil Fixed Molded 330 H 1 2500 04 99800 L3 Coil Fixed 0 82 H 1 1537 10 99800 Q1 Transistor 1 2N2857 80131 02735 Q2 Transistor 1 841001 2 14632 Q3 Transistor 1 2N706 80131 04713 Q4 Transistor 1 3N128 80131 0273...

Page 289: ...s R3 R18 Same as R2 R19 Same as R2 R20 Resistor Fixed Composition 220 n 5 1 4 W 1 RCR07G221JS 81349 01121 R21 Resistor Fixed Composition 62 n 5 1 4 W 1 RCR07G620JS 81349 01121 R22 Thru Same as R2 R31 Ul Integrated Circuit 4 SN74LS190N 01295 U2 Thru Same as Ul U4 U5 Integrated Circuit 2 SN7425N 01295 U6 Integrated Circuit 1 SN74LS11N 01295 U7 Same as U5 U8 Integrated Circuit 1 867474 14632 U9 Integ...

Page 290: ...Figure 5 29 W 8718 _ r j t Ooc ii 01iO o o A6 791580 00 0 Figure 5 29 Type 791580 1 Motherboard A6 Location of Components 5 76 Courtesy of http BlackRadios terryo org ...

Page 291: ...l Interconnect 1 791828 14632 Cl Capacitor Ceramic Disc 0 47 F 20 50 V 3 34452 1 14632 C2 Same as Cl C3 Same as Cl Jl Post Feedthru 3 PE7 14045 00779 J2 Same as Jl J3 Same as Jl J4 Faston Tabs 4 62073 1 00779 J5 Same as J4 J6 Same as J4 J7 Same as J4 MPI Housing P C Connector 9 117798 3 00779 MP2 Thru Same as MPI MP9 XAI Contract Strip 36 PE7 14046 00779 XA2 Same as XAI Part of MCM 2 Option 5 77 C...

Page 292: ...FIGURE 5 30 5 78 Figul e 5 30 Type 791575 2 Tuning Up Down Counter 6Al Location of Components WJ 8718 HF RECEIVER Courtesy of http BlackRadios terryo org ...

Page 293: ...esistor Fixed Composition 4 7 n 5 1 4 W 1 RCR07G4R7JS 81349 01121 R4 Resistor Fixed Composition 1 0 kn 5 1 4 W 3 RCR07G102JS 81349 01121 R5 Thru same as R1 R8 R9 Resistor Fixed Composition 470 n 5 1 4 W 1 RCR07G471JS 81349 01121 RIO same as R1 R11 same as R4 R12 Resistor Fixed Cpmposition 100 n 5 1 4 W 1 RCR07G101JS 81349 01121 R13 same as R4 R14 Resistor Fixed Composition 470 kn 5 1 4 W 1 RCR07G4...

Page 294: ...Fixed Composition 620 Il 5 1 4 W 1 RCR07G62lJS 81349 01121 R2 Resistor Fixed Composition 100 Il 5 1 4 W 1 RCR07G101JS 81349 01121 R3 Resistor Fixed Composition 2 7 kll 5 1 4 W 1 RCR07G2R7JS 81349 01121 R4 Resistor Fixed Composition 100 kll 5 1 4 W 1 RCR07Gl04JS 81349 01121 R5 Resistor Fixed Composition 22 Il 5 1 2 W 1 RCR20G220JS 81349 01121 R6 Resistor Fixed Composition 10 kll 5 1 4 W 2 RCR07G103...

Page 295: ...ENDOR Al Tuning Resolution 1 791589 14632 MPI Knob Assembly 1 280064 1 14632 MP2 Button Black Shell with Green Indicator 5 FAI0I BLKW GRN 31918 MP3 Thru Same as MP2 MP6 Ul Encoder Assembly 1 34836 1 14632 Part of MCM 2 Option MPI Figure 5 32 Type 791874 1 Manual Tuning Module A7 Location of Components MP2 MP3 MP4 MP5 MP6 5 81 Courtesy of http BlackRadios terryo org ...

Page 296: ...FIGURE 5 33 AI UI e a WJ 8718 HF RECEIVER 5 82 Figure 5 33 Type 791874 1 Manual Tuning Module A7 Rear View Location of Components Courtesy of http BlackRadios terryo org ...

Page 297: ... MANUFACTURER S MFR RECM DESCRIPTION PER PART NO DESIG ASSY CODE VENDOR Cable Assembly 1 34524 2 14632 PI Connector Plug 1 88475 3 00779 SI Switch Pushbutton 1 18488 14632 E2JPI I H H Figure 5 34 Type 791589 Tuning Resolution A7 All Location of Components 5 83 Courtesy of http BlackRadios terryo org ...

Page 298: ...FIGURE 5 35 o C J 0 U2 o PI WJ 8718 HF RECEIVER 5 84 Figure 5 35 Type 791578 Frequency Display A8 Location of Components Courtesy of http BlackRadios terryo org ...

Page 299: ...mposition 47 Q 5 1 4 W 1 RCR07G470JS 81349 01121 R2 Resistor Variable Film 100 Q 10 3 4 W 1 89PR100 73138 R3 Resistor Fixed Composition 820 Q 5 1 4 W 1 RCR07G821JS 81349 01121 R4 Resistor Fixed Composition 200 Q 5 1 4 W 1 RCR07G201JS 81349 01121 U1 Integrated Circuit 7 5082 7663 28480 U2 Thru Same as U1 U7 U8 Integrated Circuit 1 DS88857N 27014 U9 Integrated Circuit 1 CD4028AE 02735 U10 Integrated...

Page 300: ...Y MANUFACTURER S MFR RECM DESCRIPTION PER DESIG ASSY PART NO CODE VENDOR Cable Assembly 1 34524 1 14632 PI Connector Plug 1 88475 3 00779 SI Switch Thumbwheel 1 339910490 00226 09353 P1 Figure 5 36 Type 791827 BFO Switch A9 Location of Components 5 86 Courtesy of http BlackRadios terryo org ...

Page 301: ...R RECM DESCRIPTION PER DESIG ASSY PART NO CODE VENDOR Al Upper Panel 1 791583 14632 A2 Lower Panel Control 1 791826 14632 Cable Assembly 1 34528 14632 PI Connector Plug Ribbon 1 88476 7 00779 AI I A2 PI Figure 5 37 Type 791684 2 Front Panel Control AID Location of Components 5 87 Courtesy of http BlackRadios terryo org ...

Page 302: ... S MFR RECM DESCRIPTION PER DESIG ASSY PART NO CODE VENDOR J1 Faston Receptacle 1 62073 1 00779 Sl Switch Pushbutton 1 18485 14632 S2 Switch Pushbutton 1 18486 14632 S3 Switch Pushbutton 1 18487 14632 JI Figure 5 38 Type 791583 Upper Panel Control A10Al Location of Components 5 88 Courtesy of http BlackRadios terryo org ...

Page 303: ...Resistor Variable Composition Dual 25 k 25 kn 1 70P3N056L253A 01121 10 1 W R3 Resistor Fixed Composition 220 n 5 1 4 W 2 RCR07G221JS 81349 01121 R4 same as R3 R5 Resistor Fixed Composition 100 kn 5 1 4 W 2 RCR07G104JS 81349 01121 R6 Resistor Fixed Composition 1 kn 5 1 4 W 2 RCR07G102JS 81349 01121 R7 same as R5 R8 same as R6 Sl Switch Pushbutton 1 18488 14632 U1 Integrated Circuit 1 MC3403P 04713 ...

Page 304: ...SECTION VI SCHEMATIC DIAGRAMS Courtesy of http BlackRadios terryo org ...

Page 305: ...40jJH L6 0 40pH L7 0 36jJH RI 10K 1 4W C3 20 C4 68 C5 10 C6 180 C7 10 C8 180 C9 27 CIO 180 CII 15 CI2 200 CI3 220 CI4 15 CI5 200 CIG 120 VR2 J 6 2V IN753A L NOTE UNLESS SPECIFI ED 0 RESISTANCE IS IN OHMS b CAPACITANCE IS pF Figure 6 1 Type 791616 RF Filter A2 Schematic Diagram 34437 6 1 Courtesy of http BlackRadios terryo org ...

Page 306: ...I I I I I I I I CI I I LI L2 L3 L4 L5 I 351 351 351 351 297 I EI 47 JF 429JJH 429JJH 429 JH 429JJH 363JJH E2 I I I I I I I I I I L__ NOTES I UNLESS OTHERWISE SPECIFIED a RESISTANCE IS IN OHMS 5 1 4W b CAPACITANCE IS IN pF Figure 6 1a Type 791616 RF Filter A2 Schematic Diagram 380082 Product Improvement 6 1a Courtesy of http BlackRadios terryo org ...

Page 307: ...I E2 0 3 1 H Ed 1 I C4 1000 RI8 R21 10 560 L2 Q5 2N2857 E6 E5 RI7 IK RI9 22 CII O R20 CI5 220 L5 470 10JJH n t J IN R4 NOTE 2 150 1 8W ISTMIXER IST IF PART 34748 REF DESIG PREFIX AI 3 QI 2N2222A R3 10 C2 T IOOO RAI CI _ 1000 eRI IN4446 R2 82 2ND MIXER 2ND IF PART 34749 REF DESIG PREFIX A2 I LI IE2 1 8 pH i L J J I I I i I I I I 1 I r UI 3 8 7 M9D BALANCED I 2 MIXER 4 6 I IE2 r I I I L_ L _ AI J I ...

Page 308: ... _2 4 J 1 J 3NI87 I 01 Io j __ J L l 4I IN FL BP OUTI Ll 71 l r _ _ _ I RI4 3NI87 7r 3 2 kHz CW lC8 RI1 3 4 68 I 2f J I 1 R7 1 01 470K l I itJ C6 200 R8 T C I R 3 3 O rl 470K 1_ 01 470K _L C3 CI6 RI6 1 01 01 22 f ____ __ _ vvv 3L2 32 2jJH C31 68pF 1 II R28 10K R2 1 2K R47 10K 3 2kHz I 0 __ _ __ _ SWl I I I I t R46 6kHz iJ I 1 2 K SW R48 lCI3 I 10K lOI 10 MHz I INPUT O I SHIELD GOO I R29 16kHz 12K ...

Page 309: ...Courtesy of http BlackRadios terryo org ...

Page 310: ...168 QI 2N2708 C3 01jJF n CI 1 F 10 7MHz INPUT SIGNAL RETURN 11 155 MHz INPUT 0 11 1 R2 56 SHIELD II GND _ L R7 560 C5 r 01jJF o I O 15V NOT USED CD 0THRU0 THRU NOTES GND I UNLESS OTHERWISE SPECIFIED a RESISTANCE IS IN OHMS 5 1 4W b CAPACITANCE IS IN pF 2 ENCIRCLED NUMBERS ARE MODULE PINS Figure 6 4 Type 71430 10 7 MHz 455 kHz Converter A4A2 Schematic Diagram 34384 6 7 Courtesy of http BlackRadios ...

Page 311: ... 0 47 CI C5 0 47 2N222 2 A 0 47 FLI IN NOTE3Pur R4 R2 R3 1 2K RI 3 9K 270 22K C2 RI4 0 47 100 CI3 0 47 CII Q3 Cf4 455 KHz 0 47 2N2222A FL2 0 47 INPUT IN 1kHz OUT R20 BPF I RI8 RI9 1 2 K RI7 3 9K 270 22K CI2 R24 0 47 100 r 7 14 TOP VIEW TYPE FL I 791595 1 325 Hz BPF 791595 2 100Hz BPF 7 8 MC3403 NOT ES I UNLESS OTHERWISE SPECIFIED a RESISTANCE IS IN OHMS 5 1 4W b CAPACITANCE I S IN jJF 2 ENCIRCLED ...

Page 312: ...0K US B OU T IV JI CW J 1 J 3 4 FILTER R9 4 7 K _ C8 10 47 R7 68 v I r JVI J 15 V R5 C6 a 22 1 47 lC5 10 47 lC3 1 0 47 CR3 CR2 CRJ IN4449 IN4449 IN 4449 I I l I R3 10K R2 470K R21 10 K L MODULE PIN NUMBERS HIGHEST REF REF DESIG DES G USED NOTE USED CI6 CR5 FLI L2 Q2 R22 NOTES I UNLESS OTHERWISE SPECIFIED a RES 1STANCE ISIN OHM S 5 J I 4 W b CAPACITANCE lSI N J I F 2 ENCIRCLED NUMBERS LETTERS ARE F...

Page 313: ...5 10K CR2 IN4449 CIO 3 1 47 I l UIA 4 RI9 MCI458 V IIr 2 t 8 100 13 14 51 52 3 4 49 50 I I I I 15V ISB SWITCH USB SWITCH 455kHz INPUT DETAIL A IEl8 2 TOP 7 3 VIEW 6 4 5 MCl458 TABLE A TYPE F L I 791596 1 92122 791596 2 92194 NOTES I UNLESS OTHERWISE SPECIFIED a RESISTANCE IS IN OHMS 5 1 4W b CAPACITANCE IS IN pF 2 PIN CONFIGURATION IS SHOWN IN DETAIL A 3 DIFFERENCE BETWEEN TYPES IS SHOWN IN TABLE ...

Page 314: ...___ __t _ _ _ VV r 0 15 V C5 LI C6 C9 CI4 CI5 L2 G R4 0 47 470 jJH 1 47 1 47 I 15 10 47 RI6 6 8mH CI6 10 _ _ RI5 10 0 47 455kHz 470K OUT R7 68 R28 10K 2 R3 10K C2 10 47 R27 10K R2 470K 000THRU THRU THRU GND IN4449 CI OA7 RI 10K 1 L I CR5 R29 IOK R20 t49 RI4 100 R30 B V 100 CR4 IN4449 10K LS o 1I At f r _ 4I l 4I 1 _e_ V I _ SB 455kHz I N O H _ NOTES I UNLESS OTHERWISE SPECIFIED a RESISTANCE IS IN ...

Page 315: ...PIN CONFIGURATION IS SHOWN IN DETAIL A 3 DIFFERENCE BETWEEN TYPES IS SHOWN IN TABLE A ISB OUTPUT I I I I I I I I 53 54 R31 10K CIG 47 1 R30 10 Q3 2N2222A R29 150 R27 2 4K R28 4 7K E 1 CI4 47 1 1 2 7 8 9 10 15 THRU 20 41 THRU 48 59 60 CRI CR2 IN4449 IN4449 RI8 100 RI7 22 R26 22K R22 10K RI9 10K C9 1 CIO 47 1r 47 t __ 5 1 R20 R21 IUIA 4 100 22K _6 1 CI 7 JVVI 4 CII CI2 47 1 47 51 52 49 50 3 4 I l I ...

Page 316: ...33 1 5K RF GC 4 7K 03 R41 CR5 2N2 6 8K CR7 IN4449 222A IN4449 R39 68K EI R50 R24 3 9K CR8 15K E2 NOTE4 IN4449 MAN SW DIVERSITY AGC OUTPUT R28 100 15V C5 0 47 RIO 150K R3 470K C4 33 C7 15V 47 I f NOTES I UNLESS OTHERWISE SPECIFIED a RESISTANCE IS IN OHMS 5 1 4W b CAPACITANCE IS IN jJF 2 ENCIRCLED NUMBERS ARE MODULE PINS 3 UI U2 LEAD ARRANG EMENT DETAI L A 4 NOMINAL VALUE FINAL VALUE FACTORY SELECTE...

Page 317: ...00 pF CR2 IN4449 L2 39J lH 4 RI3 39K RI4 270 3 Q2 3NI87 2 CD 0 THRU C7 01 I R28 120K C8 0 47 I RII 47K CRI IN4449 R9 100 CW LI R8 RIO 6 8 mH 220 680K R7 5K QI 3NI87 4 R6 270 C2 1 0 47 R4 39K 2 C3 01 1 R5 120K CI R2 0 47 2 2K RI 33K L NOTES I UNLESS OTHERWISE SPECIFIED a RESISTANCE IS IN OHMS 5 1 4W b CAPACITANCE IS J lF 2 ENCIRCLED NUMBERS LETTERS ARE MODULE PIN NUMBERS 3 CW ON R7 INDICATES FULL C...

Page 318: ...THRU U38 7 R39 MC3403 47K 5 R46 22K R43 100 158 AGC R48 R50 82K 1 2K R44 680K G R45 R51 4l 13 15K LOK 14 U2D R41 10K 14 U3D R49 Q3 12 MC3403 2N2907 IK R42 15K 158 IF AGC Q5 2N2907 f e R67 22K II_ 8 U3C MC346 j 1 O __ JVVIo R66 A JV 68 1 v K t 1 I I L _ s o 1 0 NOT USED NOTES I UNLESS OTHERWISE SPECIFIED o RESISTANCE ISIN OHMS f5 1 4W b CAPACITANCE IS IN J F 2 ENCIRCLED NUMBERS ARE MODULE PINS 3 UI...

Page 319: ... CI7 R25 v 1 3300 5 6K _ pF TI 1 Lo oJ CI C3 C6 CI r_ EI 0 47 I 10 47 V R5 _ C8 __ C9 l7 rl UI 8 R4 f 470pF E2 68K f 390 1 150pF R2 CA3012 5 47 U _ pF C 2 IK B AMP N r v O o J C3 E3 2 1 4 L C _ I __ E3 _ 4 dl _ _ I N_4_4_4_9_ _ J 3 C5 1 1 C2 C4 1 0 47 3 b pF 0 47 0 47 J _ CI4 r 0 47 t BFO SIGNAL INPUT RETURN NOTES I UNLESS OTHERWISE SPECIFIED a RESISTANCE IS IN OHMS 5 1 4W b CAPACITANCE IS IN Jl F...

Page 320: ... QI CI UI899E 51 0 47 S D 1 1 1 1 r__ _JVV r_ 4Il ____I RI 22K AM DET IN 8 CRI R6 IN4449 2K 15V 0 I IW R2 C3 TI 330K 4 0 47 I IW R3 47K 2 4 RIO lOOK AM 3 SW II R4 c W 7 47K R7 R8 lOOK lOOK 0 47 C2 0 1 L NOTES I UNLESS OTHERWISE SPECIFIED 0 RESISTANCE IS IN OHMS 5 1 4W b CAPAC ITANCE IS IN jJF 2 EN CJRCLED NUMBERS ARE MODULE PINS 3 UI U2 LEAD ARRANGEMENT DETAIL A 15V PHONE LEVEL IN GND AUX PHONE OU...

Page 321: ... 47 FBII L4 T V FBI FB2 E2 4 7 R4 C8 IK C4 05 C6 05 VCO 0 47 VOLTAGE CONTROLLED E2 GND AIP2 OSCILLATOR E3 C6 C4 LO EI TYPE 791629 OUTPUT REF DESIG PREFIX AI CI C2 C3 RF OUT SCHEM 51198 AIEl FB3 FB4 FB5 FB6 1 NOTE 3 TABLE B 6 25 TYPE A2 791630 1 791600 1 791630 2 791600 2 791630 3 791600 3 Figure 6 13 Type 791630 1st and 3rd LO Synthesizer Time Base Assembly A5Al Schematic Diagram 43305 TABLE A GND...

Page 322: ...200 2001 R20 R28 47 1 4W C27 1200 4_7 l I 4W 15000 E2 C6 4 3 NOTE 2 C5 I68 lJ F VCO 12V VCO GND GND C5 3 0 R3 CRI 22K L5 881058 a 56 JJ H C4 1200 R4 47 C4 1000 EIO L4 C3 1200 R3 1 2K C2 1200 R2 1 2K CI 1200 RI 1 2K r I CI5 ISTLO VCO 100 I PART34750 REF DESIG PREFIX AI I I I I I I E6 E9 Ell I VV v JVV1r t VV v R27 RI R2 I 33K 33K 12K I CRI CR2 CR3 MPN3401 MPN3401 I I I I L L 4 5 TOP VIEW MCI697P 8 ...

Page 323: ...Courtesy of http BlackRadios terryo org ...

Page 324: ...T T P TP UNLOCK POINT STD DECOU PLED A59 C20 r 0 1 R7 5 6K NOTE 4 R74 470 R8 lOOK NOTE4 EI9 A51 8 E22 3 U6A p CR4 0 5082 4684 tJ 73 SN74LSOO 1 10 9 U6C CI8 4700pF 1 13 EI3 12V E8 TP T E6 c TV 12V 12V 12V 12V OUT E5 TP T 12 UI7 E6 r 4 DO SN74LSI96N 5 REF U5 MC4044P E20 E21 3 V D 2 PHASE I t l RN6 o IolII I DET SN74LSOO 5 6K CR2 2 NOTE 4 5082 2800 2 LEADLAG _ FILTER U7 6 741 tC 3 7 1V 4 TV REF I r E...

Page 325: ... II I P 1 5 3 O I L _ E S_9_ E4 1 0E 3_ 1 _ 1 E Tt 12 E I 13 C KI I S 4 P F t s l c 7 s IK VSS E S E C 01 2 E 1 C LSI9 L D 4LSI9 D UI PU M 1 40p 4 UF DF T _ J 1 6 G RU I 9 1 3 100 91 10 II 1213 I 13 I 13 1131412 III S1 10 7 I 8 93 Vee 3 73 Vee 3 L 4_ Vee 3 l J l J I 2 RI 8 I ISV ISV A r aG 10 L Y rv I Vee 2 SV I L CI 8 CRI SV I Rl7 8 C70 I LC74 tLC27 If TO 7 74LSOO 9 II 6 13 S d 684 ig Vee3 j I R4...

Page 326: ...D D C B A 14 U D D C B A 14 U D D C B A CK U4 CK U3 CK U2 CK UI 4 13 4 13 4 13 h 74LSI90 E h RC 74LSI90 E RC 74LSI90 E RC 74LSI90 E LOAD 0D 0c 0B 0A LOAD 0D 0c 0B 0A LOAD 0D 0c 0B 0A LOAD 0D 0c 0B 0A I 7 6 2 3 1 7 6 2 3 1 7 6 2 3 I 7 6 2 3 74LSII 2 4 5A A 7425 6 9 10 III r I___ _ o t _ _ _ _t_ _ ____ __ _t_ Q B A D L SWITCH INPUT FIXED r SWITCH INPUT 2 3 22 2 1 20 BFO 23 22 2 20 I I R24 IK R27 IK ...

Page 327: ...01 02 03 04 CO 01 02 03 04 CO CK 0 CK 10K 6 II 14 1f0 6 II 14 9 6 II 14 6 II 14 2 17 6 II 14 2 17 6 II 14 2 7 I 14081 14081 14081 6 10 VDD2 J U9A J U9B 13 U 8 D 5 U 8 B I U 8 A UIF 14027 14027 74CI4 10 5 O 4 II II 4 3 K K I I 12 6 2 13 I I 20 2 22 23 2 0 2 1 22 2 3 20 21 22 2 3 uac 14081 14081 UI 8B I 2 4 2 5 26 12 9 8 5 6 20 21 22 2 3 20 2 1 22 23 fO 2 1 22 23 L _ 4070 I 10 1 R6 R7 R8 10 2 10 3 v...

Page 328: ... 9 a b e d e f 9 a b e d e f 9 a b e d e f g 16 I LT RI RBI Vee I 13 10 8 7 2 1 13 10 8 7 2 II I 13 10 8 7 2 II I 13 10 8 7 2 II I 13 10 8 7 2 II I 13 10 8 7 2 II II 13 10 8 7 2 13 _E8 7 a I A 12 1 b I _E4 I II I B U8 e DS8857 10 I E2 2 C d I 9 e I E6 6 5 D f 14 GND 9 18 2 4 9 6 7 8 15 00 10 IOV UNREG DETAIL B DETAIL C U8 U9 UIO 1 16 I 18 2 15 2 17 3 14 3 16 4 13 4 15 5V 5 12 5 14 6 1 6 13 GND 7 1...

Page 329: ...ACH IIEII NO 4 a SCHEMATIC SHOWN WITH A MANUAL CONTROL MODULE MCM 2 REMOTE INPUT REMOTE INPUT CONNECTOR A6AIJI IS APPLICABLE TO MANUAL CONTROL MODULE MCM 2 AND REMOTE CONTROL MODULE RCM ONLY b FOR MANUAL CONTROL OPERATION WITHOUT REMOTE INPUT MCM t REPLACE A6AI ONLY c FOR REMOTE CONTROL OPERATION REPLACE A6AI AND A7 WITH REMOTE CONTROL MODULE RCM 5 AIOAI AND AIOA2 ARE PART OF FRONT PANEL CONTROL T...

Page 330: ...XAI L XA3 XA71 TP6 XA9 1I I I XAIO L I b I I TPI TP2 TP3 TP5 1 I T I UTI II P49 WI9 P32 J2 JII U2PI T C I FLlP3 TI 5 v I 15V 15V LSB E3 I I I CR I IP38 J31 J32 P35 I E3 I l eb D I FLlP4 TI 2 2 I 6 TI 6 P39 INJ614 I E 1 C4 1 C3 IOV UNREG I PI9 USB I E2 I 1 E 1FLlP5 TI 3 P51 W20 IP50 JI9 18000 18000 I I Y I ISB T EI I 1 F ff F IFLlP6 TI I I P40 I E J20 UNREG GND I I y P 8 II I I I I POWER DISTRIBUTI...

Page 331: ...23 B52 25 851 CI R2 32I E9 I E16 162 1 10 720810 161 BI9 0 47J 100 r 38 E3 I EI2 _ 12 22 MSD L 2 1 B2 1 87 _ _ 137 I E4 V EIO 10 23 J GND B60 J2 A5P2 15V 57 _ _f___l39 f E2 V EI4 14 _ 29 1 15V 59 35 f E6 V EI5 _ 15 SIG 6 1 t 1 114 I E7 l__ J 5 TPI2 13 I E8 A7AI PI J4 120 B9 12 1 TPI3 I 10 I EII EI3 13 5V 1 121 850 13 1 TPI4 18 9 I E12 V E5 5 REM IND 10 22 B6 II TPI5 16 6 I EI5 v EI I GND L23844 10...

Page 332: ...t _ t H f t It t l t r f J t t l I f H I f _ r f f 1 1 t f I _ f f f I f H I I I I I I i I L I t I i t l I I i I i i I ttt i i EF t or I t 1 t I I I I I f l I i t I f t t t t r t t I I I I IT I i I I f t i i I i I i I I i H t f I 1 1 r f r t t r f f f t 11 i f I i t L f j I 1 F t t r I 1 1 e f j _ j _ o f I ___I __ i I I 1 r I f f i I 1 I I I I l I T t I I f e I f t I i f 1 f f l to I f 1 I n L t ...

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