Watkins-Johnson Company WJ-8711A Installation, Operation And Maintenance Manual Download Page 182

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MAINTENANCE

WJ-8711A DIGITAL HF RECEIVER

7-24

FRONT

REAR

FRONT PANEL

ASSEMBLY

(A1)

TUNER

ASSEMBLY

(A3)

87IL75

TOP

COVER

REMOVED

DIGITAL

ASSEMBLY

(A2)

POWER

SUPPLY

(PS1)

FL1J1

TOP

COVER

REMOVED

Figure 7-16. Digital Control PC Assembly (A2) Remove and Replace Procedures (Part 2)

7.7.9

RF TUNER ASSEMBLY (A3) REMOVAL PROCEDURES

Refer to

Figure 7-17

and

Figure 7-18

Remove the nut and washer from connectors A3J1, A3J2, and A3J3 (2) on the
rear panel of the receiver (1).

Remove A3P1 (3) from A2J4 on the Digital Control PC Assembly (5).

Remove seven screws (4) from the RF Tuner Assembly (5) and lift the RF
Tuner Assembly from the receiver.

7.7.10

RF TUNER ASSEMBLY (A3) REPLACEMENT PROCEDURES

Refer to

Figure 7-17

and

Figure 7-18

Secure the RF Tuner Assembly (5) to the receiver by attaching seven screws
(4) securely.

Connect A3P1 (3) to A2J4 on the Digital Control PC Assembly (5).

Replace the washer and nut on connectors A3J1, A3J2, and A3J3 (2) on the
rear panel of the receiver (1).

Courtesy of http://BlackRadios.terryo.org

Summary of Contents for WJ-8711A

Page 1: ...NANCE MANUAL FOR THE WJ 8711A DIGITAL HF RECEIVER P N 181126 001 Revision Q Copyright Signia IDT Inc 1995 All Rights Reserved Signia IDT Inc 700 Quince Orchard Road Gaithersburg Maryland 20878 1794 No...

Page 2: ...OR IMPLIED If the goods delivered or services performed fail to conform to the warranty stated in this clause Seller will correct the nonconformity at its expense by such repair adjustment modificatio...

Page 3: ...ght angle and remove with fingers Wear eye protection when handling component with lithium content Do not puncture compact incinerate short circuit or expose the lithium energy source to temperatures...

Page 4: ...iv THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...

Page 5: ...J 2 0 Illustration J 2 1 Section Two Q 2 3 thru 2 4 Section Two N 2 5 thru 2 6 Section Two K 2 7 Section Two P 2 8 thru 2 9 Section Two N 2 10 Section Two Q 2 11 Section Two P 2 12 Section Two Q 3 i S...

Page 6: ...Eight I 8 10 Section Eight P 8 11 thru 8 14 Section Eight I 8 15 Section Eight P 8 16 thru 8 28 Section Eight I 8 29 Section Eight P 8 30 thru 8 50 Section Eight I FP i Section Cover N FP ii Intentio...

Page 7: ...e use of a shielded twisted pair cable with the CSMA interface to ensure electromagnetic compatibility with other devices Added Declaration of Conformity to IEC EMC standards Also corrected errata Bit...

Page 8: ...DIRECTIVES SAFETY IEC 1010 1 1990 and EN61010 1 1993 w Amendment A2 7 95 EMC EN50081 1 Radiated and Conducted Emissions to EN55022 Class B EN50082 1 Including IEC 801 2 1984 IEC 801 3 1984 and IEC 80...

Page 9: ...9 WJ 871Y 485 485 Interface Option 1 9 1 5 10 WJ 871Y SEU Speech Enhancement Union 1 9 1 5 11 WJ 871Y IFC 12 5 kHz IF Output Option 1 9 1 5 12 WJ 871Y FSK Frequency Shift Keying Option 1 9 1 6 WJ 8711...

Page 10: ...or Remote Operations 2 8 2 3 Equipment Malfunctions 2 10 2 4 Preparation for Reshipment or Storage 2 11 SECTION III LOCAL OPERATION Paragraph Page 3 1 Introduction 3 1 3 2 Description of Controls Indi...

Page 11: ...splay 3 16 3 2 21 The Dwell Key and Led 3 16 3 2 22 The Step Size Key and Led 3 17 3 2 23 The Channel View key and Led 3 17 3 2 24 The Channel Execute Key and Led 3 18 3 2 25 The Scan Type Key and Led...

Page 12: ...ll Timer 3 37 3 8 2 Scan Setups 3 37 3 8 2 1 CHANNEL Scan Setup 3 38 3 8 2 2 Frequency to Frequency F1 F2 Scan Setup 3 39 3 8 2 3 Frequency to Frequency with Lockouts F1 F2 w Lock Scan Setup 3 39 3 8...

Page 13: ...ntroduction 5 1 5 2 Controlling Multiple Receivers Via the CSMA Interface 5 1 5 3 Setting Up the Receiver For Remote CSMA Interface 5 2 5 4 Electrical Requirements of the Interface 5 3 5 5 Serial Data...

Page 14: ...18 SECTION VI CIRCUIT DESCRIPTION Paragraph Page 6 1 WJ 8711A Digital HF Receiver Functional Description 6 1 6 2 Circuit Descriptions 6 2 6 2 1 Type 797006 RF Assembly A3 6 2 6 2 2 Type 797214 Digita...

Page 15: ...PC Assembly A2 Removal Procedures 7 22 7 7 8 Digital Control PC Assembly A2 Replacement Procedures 7 23 7 7 9 RF Tuner Assembly A3 Removal Procedures 7 24 7 7 10 RF Tuner Assembly A3 Replacement Proc...

Page 16: ...ype WJ 8711A Digital HF Receiver Main Chassis Schematic 581650 3 Sheets FP 33 LIST OF TABLES Table Page 1 1 WJ 8711A Digital HF Receiver Specifications 1 2 2 1 List of Connectors 2 5 3 1 Tunable Notch...

Page 17: ...equest Response Format 5 12 5 12 Gain Control Mode Command Format 5 12 5 13 Gain Control Mode Request Format 5 13 5 14 Manual Gain Level Command Format 5 13 5 15 Manual Gain Level Request Format 5 14...

Page 18: ...rt 1 7 26 7 20 Power Supply PS1 Remove and Replace Procedures Part 2 7 27 7 21 Filter Power FL1J1 Removal and Replacement Procedures Part 1 7 28 7 22 Filter Power FL1J1 Removal and Replacement Procedu...

Page 19: ...1 i SECTION I GENERAL DESCRIPTION Courtesy of http BlackRadios terryo org...

Page 20: ...CHANNEL CLEAR FREQUENCY TUNE STEP LOCK MANUAL REMOTE FUNCTION SPECIAL ZERO TYPE SCAN F1 F2 CHANNEL F1 F2 w LOCK TUNE kHz WJ 8711 HF RECEIVER MHz 7 0 POWER WATKINS JOHNSON CE ATTN NORM PREAMP LSB BOTH...

Page 21: ...nual gain value and squelch threshold Prior to initiating the channel scan the operator may select a specific range of channels to scan through Individual channels within the range can be identified f...

Page 22: ...ock Time Less than 10 msec typical Antenna Input Impedance 50 ohms nominal VSWR 2 1 maximum at receiver s tuned frequency Maximum Input Signal 30 dBm Connector BNC female Third Order Intercept Point 3...

Page 23: ...600 kHz 1 35 1 163 kHz 1 35 1 2 800 kHz 1 40 1 175 kHz 1 35 1 3 000 kHz 1 35 1 188 kHz 1 35 1 3 200 kHz 1 30 1 200 kHz 1 30 1 3 600 kHz 1 45 1 255 kHz 1 45 1 4 000 kHz 1 40 1 250 kHz 1 40 1 4 400 kHz...

Page 24: ...teps Medium 100 1000 ms variable in 100 ms steps Slow 1 5 sec variable in 0 5 sec steps Selectable Front End Gain Attenuation Preamplifier Gain 10 dB 2 dB Attenuation 15 dB 2 dB Beat Frequency Oscilla...

Page 25: ...armonic Distortion Less than 3 Connector Type Screw terminals Headphone Output Number of Outputs Two unbalanced outputs For ISB mode one output contains USB left channel the other contains LSB right c...

Page 26: ...ckets are provided for installation with the equipment rack A 10 threaded grounding stud is located on the rear panel for grounding the receiver in the rack See paragraph 2 2 1 for rack mounting instr...

Page 27: ...VER OPTIONS 1 5 1 WJ 871Y REF REFERENCE GENERATOR OPTION This factory installed option improves the WJ 8711A internal reference generator stability from better than 0 7 ppm to better than 0 2 ppm over...

Page 28: ...g the reception of weak signals which are in the presence of large signals at nearby adjacent frequencies The number of selectable IF bandwidths is reduced to 8 extending from 58 Hz to 8 kHz and the r...

Page 29: ...nternal control code and the digital signal processor A2U37 runs the digital signal processing DSP code 1 6 1 WJ 8711A INTERNAL CONTROL SOFTWARE RELEASE HISTORY The WJ 8711A internal control software...

Page 30: ...ction or breaking any seals contact your Signia IDT Inc representative or the Signia IDT Inc Customer Service Department to prevent the possibility of voiding the terms of the warranty Contact Signia...

Page 31: ...o blink if at power up the front panel software is unable to communicate with the internal control software 1 6 3 WJ 8711A DSP SOFTWARE RELEASE HISTORY The WJ 8711A DSP software is stored in EPROM A2U...

Page 32: ...GENERAL DESCRIPTION WJ 8711A DIGITAL HF RECEIVER 1 12 NOTES Courtesy of http BlackRadios terryo org...

Page 33: ...2 i SECTION II INSTALLATION Courtesy of http BlackRadios terryo org...

Page 34: ...2 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...

Page 35: ...ysical abuse or careless handling during shipment If damage is found forward an immediate request to the delivering carrier to perform an inspection and prepare a concealed damage report Do not destro...

Page 36: ...nstalled within the equipment rack The WJ 8711A occupies 5 25 inches of vertical rack space eight bracket holes Four of the holes are used to secure the cabinet section of the slide to the equipment r...

Page 37: ...the outside corners of the bottom panel To mount the feet first make sure their rivet posts are extended Align each foot with a mounting hole and press in on their rivet posts until they click in pla...

Page 38: ...RF IN SMO EXT REF OUT IF CT CT DC AUDIO RSSI SQUELCH MUTE GND LINE A LINE B SPEAKER A2J3 A2J2 WATKINS JOHNSON GAITHERSBURG MD TYPE SERIAL PRESELECTOR OUTPUT RF A4J2 INPUT RF 87IL3 Figure 2 3 WJ 8711A...

Page 39: ...te serial interface port Thirteen terminal audio terminal block Provides connection for two variable line audio outputs DC coupled audio output speaker output remote signal strength indication output...

Page 40: ...with IEC EMC standards use a shielded twisted pair cable when interfacing with the WJ 8711A through the CSMA port See Section V of this manual for details on the CSMA remote interface and operations 2...

Page 41: ...rive an external signal strength indicator The output is a dc voltage which is a linear representation of the strength of the received signal The output is 0 Vdc for a signal strength of 120 dBm and 5...

Page 42: ...ither ON or OFF to its opposite position will result in a forced cold start on power up the next time the receiver is powered ON The cold start sequence paragraph 3 3 1 will occur automatically withou...

Page 43: ...0 1 1 1 1 0 0 1 1 1 1 1 1 0 0 0 0 0 1 0 0 0 0 1 1 0 0 0 1 0 1 0 0 0 1 1 1 0 0 1 0 0 1 0 0 1 0 1 1 0 0 1 1 0 1 0 0 1 1 1 1 0 1 0 0 0 1 0 1 0 0 1 1 0 1 0 1 0 1 2 3 4 5 6 7 8 O N A2S 1 FUNCTION RemoteInt...

Page 44: ...ction or breaking any seals contact your Signia IDT Inc representative or the Signia IDT Inc Customer Service Department to prevent the possibility of voiding the terms of the warranty Contact Signia...

Page 45: ...rmation on the 5x6 inch PRODUCT DISCREPANCY REPORT card Form WJC QA55 0 that was provided with the original shipment Also ensure that the Return for Maintenance Authorization RMA number is recorded on...

Page 46: ...INSTALLATION WJ 8711A DIGITAL HF RECEIVER 2 12 5 Ship to Signia IDT Inc 700 Quince Orchard Road Gaithersburg MD 20878 1794 U S A Courtesy of http BlackRadios terryo org...

Page 47: ...3 i SECTION III LOCAL OPERATION Courtesy of http BlackRadios terryo org...

Page 48: ...3 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...

Page 49: ...e Operation Configurations from the Front Panel 3 10 Before attempting to operate the receiver it is recommended that the operator become familiar with the capabilities of the front panel controls ind...

Page 50: ...display The cursor takes the form of a digit that is constantly changing in intensity i e the digit appears to be flashing The cursor is used in decade tuning meaning that the digit highlighted by the...

Page 51: ...lit and the PAUSE key LED is not lit or if a numeric entry is in progress and not terminated The and keys move the highlighted digit of the tuned frequency display left and right respectively with th...

Page 52: ...he tuned frequency display The function of these keys is to change the receiver s tuned frequency The following are general guidelines to remember when using these keys Each press of the or keys incre...

Page 53: ...Memory Channel View Channel Store Channel Skip Channel Include paragraphs 3 6 3 7 3 8 Refer to the appropriate paragraphs listed above for the exact use and limitations when using these keys for numer...

Page 54: ...r three seconds After that time the displays will return to display the information that was present before the invalid entry was made 3 2 7 THE kHz KILOHERTZ AND MHz MEGAHERTZ KEYS The kHz and MHz ke...

Page 55: ...where xx xxx is the step size parameter value currently in effect The most significant digit of this display is highlighted when the Step Tune mode is entered indicating that it can be adjusted Theref...

Page 56: ...e available The IF bandwidth can also be adjusted with the Auxiliary Parameter edit knob when in the IF bandwidth entry mode The IF bandwidth entry mode can be exited by pressing any other Auxiliary P...

Page 57: ...iliary Parameter key extinguishing the AGC LED 3 2 15 THE BFO KEY AND LED When the CW detection mode is selected a beat frequency oscillator BFO frequency can be entered The BFO key is used to allow t...

Page 58: ...r entry mode is enabled when the BLANKER key LED is lit The current noise blanker parameter is displayed in the far right area of the upper display in the Auxiliary Parameter section When the noise bl...

Page 59: ...L FUNCTION key while the CW detection mode is selected and one of the following conditions exist The SPECIAL FUNCTION key LED is not lit or The SPECIAL FUNCTION key LED is lit and the final Special Fu...

Page 60: ...E M O T E x x x x x Hz Here xxxxx is the current selected remote control mode either RS232 or CSMA The Auxiliary Parameter edit knob can be used to change the selection The selection is recognized by...

Page 61: ...is reserved The selection is recognized by the receiver only after power is cycled off and back on 3 2 18 6 Selecting the IF Bandwidth Select Mode with the SPECIAL FUNCTION Key The IF Bandwidth Selec...

Page 62: ...provides an adjustable AGC threshold which allows the operator to force the receiver to stay in Manual Gain Control mode until a signal exceeding a preset AGC threshold level is detected Once this str...

Page 63: ...Increases clockwise and decreases counterclockwise the Noise Blanker value when the BLANKER key LED is lit paragraph 3 2 17 The range of the noise blanker value is 1 to 10 or off Attempts to tune bey...

Page 64: ...ecreases counterclockwise the position of the tunable notch filter The range is 9999 Hz in 1 Hz steps This setting represents the position of the notch filter with respect to the tuned carrier frequen...

Page 65: ...eric display in the step size entry mode MEMORY SCAN S T E P x x x x x k where xx xxx is the current step size value in kHz Pressing the key again causes the highlighted position to shift one digit to...

Page 66: ...the receiver Because Channel View mode is active when the CHANNEL EXECUTE key is lit the Memory Scan edit knob or the CHANNEL VIEW key can be used to sequence through the stored memory channels with...

Page 67: ...XX XXX is the current step size frequency in kHz DWELL XX X s where XX X is the current dwell time in seconds or DWL INFINITE when the dwell time is set to infinite Pressing the SCAN SETUP key in succ...

Page 68: ...e of the lockout memory locations of the receiver Up to 100 lockout frequencies can be entered When the FREQUENCY LOCKOUT key is pressed the Memory Scan alphanumeric display appears as shown below for...

Page 69: ...KEY NOTE The CLEAR key can be used to clear all lockout and channel memory Read the following paragraphs carefully to avoid accidental deletion of stored scan parameters The CLEAR key is located dire...

Page 70: ...SKIP KEY The CHANNEL SKIP key is located directly below the CHANNEL INCLUDE key in the Memory Scan section of the front panel Pressing this key forces the receiver into the channel view mode if not a...

Page 71: ...ed signal by pressing the PAUSE key twice once to pause the scan and again to resume the scan 3 2 34 THE MEMORY SCAN PARAMETERS EDIT KNOB The Memory Scan parameters edit knob is located below the STEP...

Page 72: ...is used to select the audio to be applied to the speaker outputs on pins 7 and 8 of audio terminal block TB1 located on the rear panel when the ISB independent sideband detection mode is selected Eac...

Page 73: ...n of the receiver when the manual gain control is selected with the AGC key and the numerical gain value is displayed in the upper display of the Auxiliary Parameter section refer to paragraph 3 2 14...

Page 74: ...cted mode displaying the last set parameters The WJ 8711A is equipped with battery backed up memory When the receiver is turned off all current receiver parameters including channel set ups are saved...

Page 75: ...dwidth etc As the receiver steps to each memory channel the receiver parameters are automatically updated with those that are stored in the memory channel until the receiver steps to the next channel...

Page 76: ...displayed in the right most digit position Depending on the frequency being entered all or just the most significant digits need to be entered For example entering a frequency of 10 MHz only requires...

Page 77: ...y changes in value according to the displayed step size 3 5 2 SELECTING A DETECTION MODE Five detection modes are available for signal demodulation AM amplitude modulation SAM synchronous amplitude mo...

Page 78: ...ls The audio available at the SPEAKER terminals of TB1 is dependent on the setting of the front panel SPEAKER switch When BOTH is selected LSB and USB audio is combined and provided at the output When...

Page 79: ...F bandwidth filters can be set to include or skip as desired To set a filter for include first select the desired IF bandwidth by rotating the Auxiliary Parameter edit knob until that bandwidth is dis...

Page 80: ...control modes are available automatic AGC or manual In the AGC mode the receiver automatically adjusts the gain level depending on the level of the received signal to provide optimum signal level for...

Page 81: ...ithout changing the frequency of the audio output signals so that unwanted CW signals can be placed outside of the IF bandwidth while keeping the wanted CW signals inside the bandwidth This is especia...

Page 82: ...ting first press the BLANKER key to light its LED and enable the noise blanker entry mode The value can be adjusted with the Auxiliary Parameter edit knob or can be overwritten with a numeric entry te...

Page 83: ...1 300 1 400 1 500 1 600 1 800 2 000 2 200 2 400 2 600 2 800 3 000 3 200 3 600 4 000 4 400 4 800 5 200 5 600 6 000 6 400 7 200 8 000 8 800 9 600 10 400 11 200 12 000 12 800 14 400 16 000 97 Hz 195 Hz...

Page 84: ...receiver parameters can be automatically updated with receiver parameters that are stored in one of the memory channels To perform this function press the CHANNEL VIEW key to enter the Channel View mo...

Page 85: ...l timer entering scan setups starting scans and stopping scans 3 8 1 USING THE DWELL TIMER The dwell timer provides the operator with a means of controlling the time the receiver remains tuned on a si...

Page 86: ...numeric entry keys to enter the new stop channel and terminate with the SCAN SETUP key Dwell Time The dwell timer value paragraph 3 8 1 can be set in the channel scan setup menu To enter the dwell tim...

Page 87: ...from 0 001 to 25 0 kHz To enter the step size first use the edit knob or press the SCAN SETUP key until STEP xx xxxk is displayed The xx xxx is replaced with the current step size in kHz Use the numer...

Page 88: ...lit NOTE When the channel scan is started both Auxiliary Parameter displays are blanked until a signal is acquired 3 8 4 PAUSING AND RESTARTING SCANS An active scan operation can be paused by pressin...

Page 89: ...on 0 LSB 1 Transmit Error the control to DSP transmit pipeline is not empty 1 2 Host Download Unsuccessful the host microprocessor could not download the operating program 2 4 EPROM Download Unsuccess...

Page 90: ...S is not displayed and error has occurred For example if bits 0 and 3 were set because their corresponding tests failed the BITE result displayed will be BITE 009 binary equivalent 00000000 00001001 I...

Page 91: ...perations or to Section V for details on CSMA remote operations 3 11 2 SELECTING THE BAUD RATE FOR REMOTE OPERATIONS The baud rate for RS 232 and CSMA remote operations can be selected from the front...

Page 92: ...LOCAL OPERATION WJ 8711A DIGITAL HF RECEIVER 3 44 NOTES Courtesy of http BlackRadios terryo org...

Page 93: ...4 i SECTION IV RS 232 REMOTE OPERATION Courtesy of http BlackRadios terryo org...

Page 94: ...4 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...

Page 95: ...trol A baud rate hardware default can also be selected Refer to paragraph 2 2 5 for details on configuring DIP switch A2S1 Various receiver parameters can be controlled and or monitored over the RS 23...

Page 96: ...et ready are not supported RS 232 serial interfaces use a method of transmitting data one bit at a time over the TXD and RXD lines For example an eight bit character takes eight sequential transmissio...

Page 97: ...ries After the query response is transmitted the receiver issues a CR LF carriage return line feed characters indicating end of response 4 3 2 FORMATS OF QUERY RESPONSES The WJ 8711A transmits respons...

Page 98: ...e WJ 8711A receives an nrf of a precision greater than it can handle it rounds the number rather than truncating it When rounding the unit ignores the sign of the number and rounds up on values greate...

Page 99: ...1 Set decay time for gain control modes Where 1 Slow AGC 2 Fast AGC 3 Medium AGC If Slow AGC time range is 1000 to 5000 rounds up to next lower 500 millisecond step If Fast AGC time range is 10 to 100...

Page 100: ...7990 BLK nrf BLK BLK nr1 Select blanking setting Range 0 to 10 Request active blanking setting Example BLK 5 Default BLK 0 BWC nrf BWC BWC nr1 Select an IF bandwidth size in Hz Range 0 to 16000 Note...

Page 101: ...80 kHz 009 113 kHz 042 2 00 kHz 010 125 kHz 043 2 20 kHz 011 138 kHz 044 2 40 kHz 012 150 kHz 045 2 60 kHz 013 163 kHz 046 2 80 kHz 014 175 kHz 047 3 00 kHz 015 188 kHz 048 3 20 kHz 016 200 kHz 049 3...

Page 102: ...00 to 98 Request currently selected channel for channel scan Example CHA 25 Default CHA 0 CHB nrf CHB CHB nr1 Select stop channel for channel scan Range 01 to 99 Request currently selected stop chann...

Page 103: ...ecute specified memory channel Range 0 to 99 FRA nrf FRA FRA nr2 Select start frequency for Frequency to Frequency F1 to F2 scan in MHz Range 0 000000 to 29 999999 Request current Frequency to Frequen...

Page 104: ...Default INC 25 000 LCK nrf nrf Enter a lockout to be used in the F1 to F2 scan w Lock mode The lockout is specified as a center frequency only The lockout width is half of the current IF bandwidth sel...

Page 105: ...OFF 1 Relative ON 2 Not Used 3 Disabled Note A disabled response occurs when the notch filter relative setting is outside the specified limits of the selected bandwidth Refer to paragraph 3 5 10 NFR n...

Page 106: ...000 to 2000 Hz 10 Hz steps Request current passband tuning offset frequency in Hz Example PBT 1250 Reset PBT 0 Default PBT 0 RCL nrf RCL nr1 nr1 nr2 nr1 nr1 nr1 nr1 nr1 Recall selected memory channel...

Page 107: ...0 Default RFG 000 Example RFG 123 RFP nrf RFP RFP nr1 Select the RF input path Range 1 3 Where 1 Normal 2 Attenuated 3 Preamplified Request the selected RF input path Reset RFP 1 Default RFP 1 Example...

Page 108: ...currently selected scan dwell time Example SDW 2 Default SDW 0 5 SGV SGV nr1 nr1 Request the signal strength value in dBm and squelch status value Range 20 to 135 0 1 Where nr1 0 squelch on nr1 1 squ...

Page 109: ...ange 1 Tuned Frequency FRQ 00 000000 to 30 000000 MHz 2 Detection Mode DET 1 to 6 3 Bandwidth Number BWN 001 to 066 see BWN command 4 AGC Mode AGC 0 to 3 5 Remote Manual Gain Level RFG 000 127 6 BFO F...

Page 110: ...n of the Event Summary Registers for bit mapped details Range 0 255 Request the Event Summary Enable Register value Reset No change Default ESE 000 Example ESE 128 ESR ESR nr1 Request the Event Summar...

Page 111: ...nt with a data string the OPC bit in the Event Summary Status Register will be set upon completion of the operation s in the input buffer An SRQ may be generated with corresponding bit enabled An OPC...

Page 112: ...t RSE 000 Example RSE 016 RSR RSR nr1 Read the Receiver Status Register The information included in this register is latched It is cleared by the CLS command or a read of the register The information...

Page 113: ...RQS Request Service Bit 7 Not Used TST TST nr1 Execute built in test BITE and report outcome The response is a bit mapped value of 16 bits representing the success or failure of each test Any failed t...

Page 114: ...the Status Byte Register and the Service Request Enable Register The receiver uses only three bits of the Status Byte Register as described in Table 4 3 The ANDed combination of bits 0 and 5 of the S...

Page 115: ...EVALUATION EVENT SUMMARY STATUS ENABLE REGISTER ESE ESE 07 enPON 06 05 enCME 01 00 enOPC 04 enEXE 03 enDDE 02 enQYE EVENT SUMMARY STATUS REGISTER ESR DEVICE DEPENDENT ERROR REGISTER 05 CME 01 00 OPC...

Page 116: ...eported as zero This bit would correspond to the RQS bit of the Status Byte Register which triggers service request 4 6 2 EVENT SUMMARY STATUS REGISTER The following discussion covers the Event Summar...

Page 117: ...of range data element follows a known message header or when a valid message count not be executed due to some device condition 5 CME Command Error Set when an unrecognized message header has bee rece...

Page 118: ...ERROR REGISTER The contents of the Device Dependent Error Register can be read to determine what event has caused the DDE bit in the Event Status Register to be set The CDE and LDE queries are used as...

Page 119: ...512 LO ERR Local Oscillator Unlocked 10 1024 REF ERR Unknown External Reference 11 2048 RAM FAIL Control Processor RAM Failure 12 4096 CHKSUM EPROM Checksum Error 13 8192 PRESEL OVRLD Preselector Over...

Page 120: ...upported RS 232C Communications Control Commands HEX ASCII Receive Transmit Function 11 13 DC DC3 x x x x XON allow data transmission XOFF disallow data transmission 05 06 15 ENQ ACK NAK x x x Enquire...

Page 121: ...of data The input buffer accepts up to 1024 bytes before overflowing As data in the buffer is being processed additional inputs can be accepted by the unit Upon receiving a terminator character the WJ...

Page 122: ...RS 232 REMOTE OPERATION WJ 8711A DIGITAL HF RECEIVER 4 28 NOTES Courtesy of http BlackRadios terryo org...

Page 123: ...5 i SECTION V CSMA REMOTE CONTROL Courtesy of http BlackRadios terryo org...

Page 124: ...5 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...

Page 125: ...oss See paragraph 5 9 for a full description of the behavior of the interface during collision detection 5 2 CONTROLLING MULTIPLE RECEIVERS VIA THE CSMA INTERFACE System hardware configuration will di...

Page 126: ...8711A can be set for CSMA remote control by selecting CSMA in the remote control entry mode with the SPECIAL FUNCTION key The baud rate and CSMA address can also be set in entry modes selected with th...

Page 127: ...NTERFACE The CSMA interface is implemented on a mini phones jack A2J2 located on the rear panel labeled CSMA The sleeve of this connector is connected to chassis to ground The center conductor carries...

Page 128: ...SSENT CONTINOUSLY THE SIGNALDOESNOT RETURNTO 0 LEVEL Figure 5 2 Composition of One byte of Serial Data 5 6 COMMAND MESSAGE FORMATTING The typical message format of a command packet used with this inte...

Page 129: ...unctions The control codes listed are shown in hexadecimal format A description is provided for each control code Data accompanying control codes is shown in decimal format unless otherwise noted Cert...

Page 130: ...0 kHz 03 3 20 kHz 04 6 00 kHz 05 16 0 kHz 02 Request the tuned frequency range 03 Request the tuned frequency 04 Request the selected detection mode and IF bandwidth 05 Set the tuned frequency in Hz w...

Page 131: ...est the selected RF input path 39 Select the RF input path with acknowledge Range 01 03 Where 01 Normal 02 Attenuated 03 Preamplified 5 8 DETAILS ON COMMAND AND RESPONSE FORMATS The following paragrap...

Page 132: ...e of the typical format for setting the receiver s tuned frequency using control code 05 This control code provides the same result as the 00 code described in paragraph 5 8 1 except it requires an ac...

Page 133: ...tains MHz data The response always contains all four bytes of the frequency data 5 8 4 RESPONSE TO TUNED FREQUENCY RANGE REQUESTS 02 Figure 5 8 shows an example of the typical response format when req...

Page 134: ...ACKNOWLEDGE 01 Figure 5 9 shows an example of the typical format for selecting the receiver s detection mode and IF bandwidth using control code 01 This control code provides the same result as the 0...

Page 135: ...t requires an acknowledgment to the controller For this reason it is the preferred method to change the IF bandwidth or detection mode FE PREAMBLE FE RX ADDR TX ADDR CONTROL CODE ENDOF MESSAGE 1A F1 0...

Page 136: ...or 06 in Table 5 1 for the possible responses for both bytes 5 8 8 GAIN CONTROL MODE COMMAND WITH ACKNOWLEDGE 31 Figure 5 12 shows an example of the typical format for selecting the receiver s gain c...

Page 137: ...01 for slow AGC or 02 for fast AGC In the example manual gain control is the response 5 8 10 MANUAL GAIN LEVEL COMMAND WITH ACKNOWLEDGE 33 Figure 5 14 shows an example of the typical format for selec...

Page 138: ...l gain level The combination of the two bytes represent the value in binary coded decimal The value can be from 0000 to 0127 or 0 to 127 dB In the example the manual gain level response is 98 98 00 5...

Page 139: ...equesting the BFO frequency with control code 34 The response in the example is 855 Hz The first byte of the frequency data contains Hz data The second byte contains 100 Hz data The third byte contain...

Page 140: ...mat when requesting the receiver s current RF input path selection with control code 38 FE PREAMBLE FE RX ADDR TX ADDR CONTROL CODE END OF MESSAGE 1A F1 38 02 FD PATH 87IL24 Figure 5 19 RF Input Path...

Page 141: ...annot place the receiver out of Remote mode 5 8 17 RESPONSE TO DEVICE CONTROL MODE REQUESTS 36 Figure 5 21 shows an example of the typical response format when requesting the receiver s current contro...

Page 142: ...ch the monitored data it is assumed that a collision has occurred The WJ 8711A immediately sends the jammer codes shown in Figure 5 22 The WJ 8711A waits for a period of time checks for an idle interf...

Page 143: ...6 i SECTION VI CIRCUIT DESCRIPTION Courtesy of http BlackRadios terryo org...

Page 144: ...ROL DIGITAL SIGNAL PROCESSOR ANALOG RECONSTRUCTION IF OUT A2J1 LINE AUDIO A LINE AUDIO B DC AUDIO SPEAKER AUDIO RSSI SQUELCH MUTE FRONT PANEL CIRCUIT CARD A1A1 POWER SUPPLY PS1 90 264 VAC SWITCHED POW...

Page 145: ...ing a nominal 30 kHz bandwidth that is routed to the Type 7970012 Digital Assembly A2 for digitizing and further processing In addition to the 25 kHz IF signal the RF Assembly provides two clock signa...

Page 146: ...ohm output The Type 797214 Digital Assembly also contains a microcontroller that provides an interface between an external controlling device and the receiver circuitry A serial control interface is p...

Page 147: ...R RFDATA RFDATA E1 PIN 10 RF DATA CONTROL EN 5 430 kHz 3RD LO 25 kHz IF OUTPUT E1 PINS 19 20 LOCK DETECT 2ND IF 455 kHz IF POST FILTER 3RD CONVERTER IF OUTPUT AMP FILTER 10 MHZ REF RFDATA REF GEN SYNT...

Page 148: ...r and analog to digital conversion circuitry This signal is output via pin 23 of connector A3E1 LO2 The 3rd LO circuit uses a phase locked loop synthesizer locked to the 10 MHz reference to produce th...

Page 149: ...al is mixed with the 430 kHz 3rd LO signal producing the 25 kHz 3rd IF signal After filtering the 25 kHz IF is output via pins 19 and 20 of connector E1 to the Digital Assembly for digitization and fu...

Page 150: ...uits each of which acts on the data only when instructed by the microprocessor via the RF0 RF1 and RF 2 control lines These lines determine the destination of the data Table 6 1 lists the states of th...

Page 151: ...ECTION IF DIGITIZER A D DATA BUS RF DATA PARALLEL TO SERIAL OUTPUT RF DATA PARALLEL TO SERIAL OUTPUT DATA BUS RFDEN MISC OUT RFDEN RFCLK J4 PIN 11 RFDATA J4 PIN 10 RF0 J4 PIN 9 RF1 J4 PIN 8 RF2 J4 PIN...

Page 152: ...monitoring The Squelch output line at the rear panel provides a logic level that indicates to external equipment if a tuned signal exceeds the programmed Squelch level It is set to logic 0 whenever a...

Page 153: ...ized with the RF clock RFCLK J4 pin 11 This is a sequence of 8 bit clock bursts that provide timing for the data transfer Three status lines provided via connector J4 are monitored by the Control Sect...

Page 154: ...ate in a Master Slave configuration where the Master controller is on the Digital Assembly A2 A full duplex serial data path is provided by the MOSI Master Out Slave In and MISO Master In Slave Out li...

Page 155: ...MENT DRIVERS SEG DRIVE 0 7 FREQUENCY INDICATOR MISC INDICATORS DS19 DS27 DIGIT DRIVERS 0 7 DIGIT DRIVE LATCH DIG COL 0 7 DIG DRIVE 5 7 SWITCH INDICATOR AND KEYPAD MATRIX SEG DRIVE 8 11 DIG DRIVE 0 4 B...

Page 156: ...over a wide range of input line voltages and frequencies It operates from 90 to 264 VAC at line frequencies ranging from 47 to 440 Hz The voltage outputs under load are as follows Voltage Current Max...

Page 157: ...7 i SECTION VII MAINTENANCE Courtesy of http BlackRadios terryo org...

Page 158: ...7 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...

Page 159: ...ive maintenance procedures dictate Refer to paragraph 7 17 15 for RAM Battery A2U5 removal and replacement procedures 7 3 INSPECTION FOR DAMAGE AND WEAR Many existing or potential troubles can be dete...

Page 160: ...red Test Equipment Equipment Recommended Type Requirement Variable Frequency Power Source Volt Amp Power Meter Signal Generator Qty 2 Frequency Counter RF Millivoltmeter RF Probe T Adapter 50 Ohm Term...

Page 161: ...Apply power to the receiver and set the receiver parameters as follows Tuned Frequency 1 000000 MHz FRQ 1 Return Detection Mode AM DET 1 Return IF Bandwidth 6 0 kHz BWS 4 Return Gain Control AGC Fast...

Page 162: ...ver on Upon power up verify that all LEDs and seven segment displays will light and are of uniform brilliance Also verify that the LED in the POWER switch is lit 5 While viewing and FREQUENCY MHz disp...

Page 163: ...dit Knob RF INPUT Button SPEAKER Button MEMORY SCAN Buttons Memory Scan Parameters Edit Knob 7 6 3 REFERENCE FREQUENCY TIMEBASE ACCURACY 1 Connect the WJ 8711A Receiver and test equipment as illustrat...

Page 164: ...onnector at the receiver rear panel A3J3 7 Note the frequency displayed on the frequency counter This frequency should be approximately 1000 Hz depending on the accuracy of the frequency setting in st...

Page 165: ...t the magnitude of change on the frequency counter display tracks with the receiver tuned frequency changes maintaining a frequency that is 1 kHz greater than the difference between the signal generat...

Page 166: ...11A SENSITIVITY PERFORMANCE TEST 1 Connect the WJ 8711A Receiver and test equipment as illustrated in Figure 7 5 BOONTON 92B RFMILLIVOLT METER 50OHM LOAD RECEIVER IFOUT A2J1 2031 SIGN AL G ENERATO R R...

Page 167: ...m 7 While observing the AC voltmeter indication turn off the signal generator RF Output 8 Note the AC voltmeter level with the RF signal removed Calculate the signal to noise ratio by subtracting this...

Page 168: ...meter as the reference level for the following FM sensitivity performance test The typical AC voltmeter indication is 0 3 dBm 19 While observing the AC voltmeter indication turn the signal generator F...

Page 169: ...r and 600 ohm load across the Line A output terminals 29 Tune the receiver and signal generator to 5 0000 MHz 15 0000 MHz and 29 9000 MHz In each case set the signal generator frequency for 1 000 kHz...

Page 170: ...djust the distortion analyzer sensitivity control for a 100 indication on the meter an indication of 1 on the 0 1 scale 8 Set the distortion analyzer function control to the Distortion position Slowly...

Page 171: ...EST 1 Connect the WJ 8711A Receiver and test equipment as illustrated in Figure 7 7 OSCILLO SCO PE RECEIVER S Q UELCH TB1 2031 SIG NAL G ENERA TO R RFIN RF OUT A3J1 H EADPH O N E 87IL38 Figure 7 7 Squ...

Page 172: ...000 MHz AM modulated output at a level of 40 dBm Set the modulation to 400 Hz 50 8 Observe that a clear 400 Hz tone is present in the headphones and the oscilloscope indicates a logic 0 at the squelch...

Page 173: ...generator output level to produce a 20 dBm reference level as displayed on the RF millivoltmeter Typical signal generator output level of 112 dBm 10 Set the receiver manual gain to minimum RFG 0 Retu...

Page 174: ...kHz Control Command BW Min kHz BW Max kHz 0 30 BWS 1 Return 0 270 0 330 1 00 BWS 2 Return 0 900 1 100 3 20 BWS 3 Return 2 880 3 502 6 00 BWS 4 Return 5 400 6 600 16 0 BWS 5 Return 14 400 17 600 18 Set...

Page 175: ...or frequency past the 10 0000 MHz tuned frequency and continue until the RF millivoltmeter again displays a 3 dB decrease in signal level from the reference set in step 5 Note the signal generator out...

Page 176: ...unit to the factory for warranty repair 7 7 1 REMOVING THE RECEIVER TOP COVER Refer to Figure 7 10 The following procedures are used to remove the top cover from the receiver 1 Place the receiver in i...

Page 177: ...tal Control PC Assembly 1 2 Remove plug PS1P1 4 from A1A1J1 on the Front Panel PC Assembly 3 3 Remove in line plug S1P1 5 from PS1J1 Note Tag or mark plug for identification purposes during replace pr...

Page 178: ...EXECUTE CHANNEL VIEW CHANNEL SIZE STEP DWELL SKIP LOCKOUT INCLUDE STORE SETUP SCAN PAUSE CHANNEL CHANNEL CHANNEL CLEAR FREQUENCY TUNE STEP LOCK MANUAL REMOTE FUNCTION SPECIAL ZERO TYPE SCAN F1 F2 CHA...

Page 179: ...t screws 4 provided 2 Turn the Front Panel Assembly over and attach the five small front panel knobs 3 to the front panel Assembly 2 by pushing each knob onto its respect shaft 3 Place the washer and...

Page 180: ...unt nonmetallic tool between the bottom face of the IC and the related socket Pry the IC up at a slight angle and remove with fingers Wear eye protection when handling component with lithium content D...

Page 181: ...Control PC Assembly 3 to the receiver by attaching six screws 5 securely 2 Connect A1A1P1 4 to J7 on the Digital Control PC Assembly 3 3 Connect PS1P2 6 to J5 on the Digital Control PC Assembly 3 4 Co...

Page 182: ...nectors A3J1 A3J2 and A3J3 2 on the rear panel of the receiver 1 2 Remove A3P1 3 from A2J4 on the Digital Control PC Assembly 5 3 Remove seven screws 4 from the RF Tuner Assembly 5 and lift the RF Tun...

Page 183: ...2 WATKINS JOHNSON TYPE SERIAL PRESELECTOR OUTPUT RF A4J2 INPUT RF GAITHERSBURG MARYLAND USA Figure 7 17 RF Tuner Assembly A3 Remove and Replace Procedures Part 1 FRONT REAR FRONT PANEL ASSEMBLY A1 TUN...

Page 184: ...bly 3 3 Remove fuse 6 with connecting wire from FL1J1 4 Remove in line plug S1P1 4 from PS1J1 5 Remove four screws 8 from the left side of the receiver 7 and lift the Power Supply Assembly from the re...

Page 185: ...fuse 6 and connecting wire to FL1P1 5 Connect in line plug S1P1 to PS1J1 4 7 7 13 FILTER POWER FL1J1 REMOVAL PROCEDURES Refer to Figure 7 21 and Figure 7 22 1 Remove two wires and one fuse from the Fi...

Page 186: ...al and Replacement Procedures Part 1 3 87IL81 40 VA MAX 47 440 Hz 90 264 VAC LINE 1 AMP SB FUSE CSMA A2J1 A3J3 A3J2 A3J1 TB1 RF IN SMO EXT REF OUT IF CT CT DC AUDIO RSSI SQUELCH MUTE GND LINE A LINE B...

Page 187: ...l containers Dispose of ICs with lithium content properly Discharged cells should be handled with care as they retain significant energy They should be electrically isolated and packaged for disposal...

Page 188: ...FRONT REAR FRONT PANEL ASSEMBLY A1 TUNER ASSEMBLY A3 87IL82 TOP COVER REMOVED DIGITAL ASSEMBLY A2 POWER SUPPLY PS1 FL1J1 A2U5 TOP COVER REMOVED Figure 7 23 RAM BATTERY U5 Removal and Replacement Proce...

Page 189: ...8 i SECTION VIII REPLACEMENT PARTS LIST Courtesy of http BlackRadios terryo org...

Page 190: ...8 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...

Page 191: ...NVENTIONS The internal computer applications at Signia IDT Inc have undergone upgrades to better serve our customers With this upgrade came alterations to the numbering scheme for parts reporting to a...

Page 192: ...1 5987 25088 Siemens America Incorporated 186 Wood Avenue So Iselin NJ 08830 06665 Precision Monolithics Inc 1500 Space Park Drive Santa Clara CA 95050 26742 Methode Electronics Inc 7447 W Wilson Aven...

Page 193: ...LIST The following parts list contains all the electrical components used in the unit along with mechanical parts which may be subject to unusual wear or damage When ordering replacement parts from S...

Page 194: ...led in the equipment may not agree with those specified in the parts list and schematic diagrams of this manual However the semiconductors designated in the manual may be substituted in every case wit...

Page 195: ...Panel PC Assembly 1 482108 1 14632 A1J1 Jack Assembly Phone 1 382887 1 14632 A1RV1 Varistor 275 VAC RMS 1 V275LA4 03508 A1S1 Switch Rocker Power 1 DM24 J72 S2 05 Q 6 OCY71 A2 Digital Control PC Assem...

Page 196: ...8 1N4449 80131 CR2 Thru Same as CR1 CR8 DS1 Display 9 HDLG 2416 28480 DS2 Thru Same as DS1 DS9 DS10 Display 8 MAN6480 58361 DS11 Thru Same as DS10 DS17 DS18 LED Lamp 1 HLMP 1503 28480 DS19 LED Lamp 9...

Page 197: ...9124 R13 Thru Same as R12 R23 R24 Thru Same as R8 R31 R32 Resistor Fixed Film 33 k 5 1 8 W 1 CF1 8 33K J 59124 R33 Resistor Fixed Film 100 k 5 1 8 W 8 CF1 8 100K J 59124 R34 Same as R5 R35 Thru Same a...

Page 198: ...0P 04713 U2 Integrated Circuit Octal D Type Latch 20 Pin Dip 2 MM74HC573N 27014 U3 EPROM Programmed 1 841676 14632 U4 Integrated Circuit CMOS Quad 2 Input Nand Gate 1 MM74HC00N 27014 U5 Integrated Cir...

Page 199: ...4HC14N 27014 U16 Integrated Circuit CMOS Dual D F F 2 MM74HC74N 27014 U17 Same as U16 U18 Same as U5 U19 Integrated Circuit Asynchronous 7 Bit Binary Counters 14 Pin Dip 1 SN74HC4024N 01295 U20 Encode...

Page 200: ...tor Ceramic 1 F 10 50VDC 8 841250 25 14632 C13 Same as C1 C14 Capacitor Ceramic 75pF 2 1 841416 046 14632 C15 Capacitor Tantalum 3 3 F 20 16V 10 841293 10 14632 C16 Same as C12 C17 Capacitor Ceramic 2...

Page 201: ...me as C49 C53 Same as C49 C54 Same as C1 C55 Same as C1 C56 Capacitor Ceramic 1000pF 10 4 841415 013 14632 C57 Capacitor Ceramic 47pF 2 4 841416 041 14632 C58 Same as C1 C59 Same as C1 C60 Same as C1...

Page 202: ...00pF 10 4 841415 015 14632 C97 Same as C57 C98 Same as C1 C99 Same as C1 C100 Same as C1 C101 Same as C27 C102 Same as C1 C103 Same as C15 C104 Same as C15 C105 Same as C4 C106 Capacitor Ceramic 220pF...

Page 203: ...9 Same as C1 C140 Same as C1 C141 Same as C1 C142 Not Used C143 Same as C1 C144 Same as C81 C145 Same as C1 C146 Same as C1 C147 Same as C1 C148 Capacitor Ceramic 100pF 2 4 841416 049 14632 C149 Same...

Page 204: ...C175 C180 Capacitor Tantalum 6 8 F 20 6 3V 2 841293 14 14632 C181 Same as C180 C182 Same as C1 C183 Not Used C184 Same as C1 C185 Same as C12 C186 Same as C12 C187 Same as C1 C188 Same as C1 C189 Sam...

Page 205: ...t Used C233 Same as C4 C234 Not Used C235 Same as C1 C236 Same as C4 C237 Same as C4 C238 Not Used C239 Not Used CR1 Not Used SOT 23 CR2 Diode Swpin Dual Switching Diode Reverse Voltage 2 MMBD7000LT1...

Page 206: ...0 H 20 7 96MHZ 9 B82422 A1102 M 25088 QMIN 25 370MA Ferrite 1210 L5 Same as L4 L6 Same as L4 L7 Same as L4 L8 Same as L4 L9 Same as L4 L10 Same as L4 L11 Not Used L12 Inductor 2 2 H 1 841444 009 14632...

Page 207: ...5 8 841414 081 14632 R10 Same as R2 R11 Resistor Fixed 820 5 1 841414 071 14632 R12 Resistor Fixed 680 5 1 841414 069 14632 R13 Same as R5 R14 Same as R5 R15 Not Used R16 Not Used R17 Not Used R18 Res...

Page 208: ...118 14632 R53 Same as R52 R54 Same as R1 R55 Resistor Fixed 33k 5 5 841414 109 14632 R56 Resistor Fixed 220k 5 6 841414 129 14632 R57 Same as R55 R58 Same as R56 R59 Resistor Fixed 68k 5 4 841414 117...

Page 209: ...R95 Same as R2 R96 Same as R94 R97 Same as R2 R98 Same as R3 R99 Same as R3 R100 Same as R55 R101 Same as R8 R102 Same as R1 R103 Same as R1 R104 Same as R1 R105 Not Used R106 Same as R9 R107 Same as...

Page 210: ...me as R1 R141 Same as R1 R142 Same as R18 R143 Same as R18 R144 Same as R1 R145 Same as R18 R146 Same as R55 R147 Resistor Fixed 150 5 1 841414 053 14632 R148 Resistor Fixed 3 3k 5 9 841414 085 14632...

Page 211: ...80 Same as R2 R181 Not Used R182 Not Used R183 Same as R2 R184 Same as R29 R185 Same as R7 R186 Same as R19 R187 Same as R2 R188 Same as R151 R189 Not Used R190 Same as R29 R191 Same as R19 R192 Not U...

Page 212: ...ame as R7 R224 Same as R1 R225 Not Used R226 Same as R8 R227 Same as R3 R228 Same as R8 R229 Same as R1 R230 Same as R1 R231 Same as R19 R232 Same as R1 R233 Same as R1 R234 Not Used R235 Same as R1 R...

Page 213: ...s R1 R267 Same as R1 R268 Same as R1 R269 Not Used R270 Same as R7 R271 Same as R19 R272 Same as R1 R273 Same as R7 R274 Same as R7 R275 Same as R1 R276 Same as R1 R277 Same as R1 R278 Same as R7 R279...

Page 214: ...R7 R312 Same as R1 R313 Same as R1 R314 Same as R5 R315 Same as R7 R316 Same as R5 R317 Same as R1 R318 Same as R5 R319 Same as R1 R320 Same as R50 R321 Same as R1 R322 Same as R1 R323 Same as R18 R32...

Page 215: ...5 Same as R1 R356 Same as R1 R357 Same as R1 R358 Same as R1 R359 Same as R1 R360 Same as R7 R361 Same as R340 R362 Not Used R363 Same as R19 R364 Not Used R365 Not Used R366 Same as R50 R367 Same as...

Page 216: ...Quad Buffer Line Driver 2 74HC125 SO14 34371 U10 Integrated Circuit Triple 3 Input AND Gate 1 74F11 SO14 04713 U11 Integrated Circuit 1 OF 8 Decoder Demultiplexer 1 74F138 SO16 04713 U12 EPROMProgramm...

Page 217: ...ervoltage Sensing Rest 1 MC34064D 5 04713 Operation W 1V Input U43 Not Used U44 Integrated Circuit Differential Bus Transceiver 2 SN75176AD 01295 U45 Same as U39 U46 Same as U39 U47 Same as U39 U48 In...

Page 218: ...534D 18324 U66 Same as U65 U67 Integrated Circuit Dynamic Range Processor Dual 1 SSM 2122P 06665 VCA 16 Pin DIP U68 Same as U60 U69 Amplifier JFET Input Operational Amplifier 2 MC34001D 04713 U70 Same...

Page 219: ...160 pF 2 50 V NPO 2 841414 054 14632 C24 Not Used C25 Capacitor Ceramic 8 2 pF 25 pF 50 V 1 8414116 023 14632 C26 Same as C23 C27 Capacitor Ceramic 27 pF 2 50 V NPO 3 841416 035 14632 C28 Same as C11...

Page 220: ...2 Same as C3 C63 Capacitor Tantalum 3 3 F 20 16 V 13 841293 10 14632 C64 Same as C3 C65 Same as C3 C66 Same as C61 C67 Same as C3 C68 Capacitor Tantalum 33 F 20 16 V 15 841293 22 14632 C69 Thru Same a...

Page 221: ...V NPO 2 841415 006 14632 C120 Same as C114 C121 Same as C12 C122 Same as C12 C123 Same as C63 C124 Thru Same as C3 C126 C127 Thru Same as C12 C131 C132 Same as C3 C133 Same as C12 C134 Same as C12 C13...

Page 222: ...C47 C171 Thru Same as C3 C173 C174 Not Used C175 Same as C49 C176 Same as C78 C177 Same as C63 C178 Same as C78 C179 Same as C119 C180 Capacitor Ceramic 39 pF 2 50 V NPO 1 841416 039 14632 C181 Same...

Page 223: ...Same as C3 C215 Same as C3 C216 Capacitor Ceramic 033 F 10 50 V 8 841415 022 14632 C217 Same as C63 C218 Same as C38 C219 Same as C216 C220 Same as C3 C221 Not Used C222 Same as C3 C223 Same as C3 C2...

Page 224: ...841415 010 14632 C265 Thru Not Used C267 C268 Same as C48 C269 Same as C94 C270 Same as C63 C271 Same as C63 C272 Same as C3 C273 Same as C12 C274 Same as C12 C275 Same as C63 C276 Same as C3 C277 Sa...

Page 225: ...Same as C3 C308 Not Used C309 Not Used C310 Thru Same as C3 C312 C313 Same as C68 C314 Not Used C315 Same as C27 C316 Same as C292 C317 Same as C12 C318 Capacitor Ceramic 22 pF 2 50 V NPO 2 841416 03...

Page 226: ...6 Same as C12 C357 Same as C3 C358 Same as C205 C359 Same as C3 C360 Same as C94 C361 Same as C216 C362 Same as C94 C363 Same as C3 C364 Thru Same as C12 C366 C367 Same as C63 C368 Thru Same as C12 C3...

Page 227: ...2 Thru Same as FB1 FB10 FL1 Filter BP 40 455 MHz 1 92609 14632 FL2 Filter 455 kHz 1 CFS 455B 51406 J1 Connector Jack BNC 3 227677 1 00779 J2 Same as J1 J3 Same as J1 J4 Not Used J5 Connector 1 79223 6...

Page 228: ...34 14632 L24 Same as L1 L25 Inductor 150 H 10 2 841699 027 14632 L26 Same as L25 L27 Same as L1 L28 Same as L1 L29 Inductor 270 H 10 13 841699 030 14632 L30 Same as L29 L31 Inductor 47 H 10 4 841699 0...

Page 229: ...BR2857 04713 Q2 Transistor 15 MMBT3904LT1 04713 Q3 Same as Q2 Q4 Transistor 18 MMBT 3906 04713 Q5 Same as Q4 Q6 Transistor 3 OST310 17856 Q7 Transistor 6 MMBTH69LT1 04713 Q8 Same as Q7 Q9 Thru Same as...

Page 230: ...26 841417 14632 R5 Same as R4 R6 Same as R2 R7 Same as R4 R8 Resistor Fixed 100 k 5 1 10 W 14 841414 121 14632 R9 Same as R2 R10 Resistor Fixed 10 5 1 10 W 35 841414 025 14632 R11 Resistor Fixed 10 k...

Page 231: ...R43 Same as R1 R44 Resistor Fixed 470 5 1 10 W 19 841414 065 14632 R45 Same as R1 R46 Resistor Fixed 15 k 5 1 10 W 5 841414 101 14632 R47 Not Used R48 Same as R11 R49 Same as R19 R50 Same as R10 R51 S...

Page 232: ...14 051 14632 R88 Resistor Fixed 270 5 1 10 W 2 841414 059 14632 R89 Same as R24 R90 Same as R21 R91 Same as R66 R92 Same as R44 R93 Same as R2 R94 Same as R81 R95 Resistor Fixed 22 5 1 10 W 7 841414 0...

Page 233: ...R123 R129 Same s R80 R130 Same as R1 R131 Same as R44 R132 Same as R21 R133 Resistor Fixed 33 k 5 1 10 W 3 841414 109 14632 R134 Same as R21 R135 Same as R44 R136 Same as R21 R137 Same as R133 R138 Sa...

Page 234: ...5 841414 067 14632 R174 Same as R42 R175 Not Used R176 Same as R4 R177 Same as R114 R178 Same as R149 R179 Same as R10 R180 Same as R2 R181 Same as R117 R182 Same as R80 R183 Same as R2 R184 Same as R...

Page 235: ...s R2 R213 Same as R42 R214 Same as R2 R215 Same as R42 R216 Thru Same as R4 R218 R219 Same as R10 R220 Same as R114 R221 Same as R42 R222 Same as R4 R223 Same as R2 R224 Same as R4 R225 Same as R4 R22...

Page 236: ...R262 Same as R10 R263 Thru Same as R4 R265 R266 Same as R11 R267 Same as R10 R268 Same as R34 R269 Same as R10 R270 Same as R21 R271 Same as R17 R272 Same as R56 R273 Same as R11 R274 Same as R17 R275...

Page 237: ...ame as R104 R306 Same as R40 R307 Same as R117 R308 Same as R1 R309 Same as R117 R310 Same as R40 R311 Same as R149 R312 Same as R95 R313 Same as R117 R314 Same as R80 R315 Same as R18 R316 Same as R1...

Page 238: ...R52 R351 Same as R34 R352 Same as R2 R353 Same as R44 R354 Same as R52 R355 Same as R11 R356 Same as R1 R357 Same as R1 R358 Same as R80 R359 Same as R80 R360 Same as R114 R361 Same as R117 R362 Same...

Page 239: ...R52 R351 Same as R34 R352 Same as R2 R353 Same as R44 R354 Same as R52 R355 Same as R11 R356 Same as R1 R357 Same as R1 R358 Same as R80 R359 Same as R80 R360 Same as R114 R361 Same as R117 R362 Same...

Page 240: ...13 Integrated Circuit CMOS 1 MB87086APF 61271 U14 Amplifer 10 NE5534D 18324 U15 Same as U7 U16 Same as U14 U17 Integrated Circuit 1 MB504PF 61271 U18 Integrated Circuit 1 SP8792 MP 52648 U19 Integrate...

Page 241: ...FP i FOLDOUTS Courtesy of http BlackRadios terryo org...

Page 242: ...FP ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...

Page 243: ...T VOLTAGE 90 TO 264 VAC 3 2 NOTES 1 2 16 12 375 18 25 3 6 9 2 5 8 1 4 RF INPUT AGC BFO BLANKER IF BW DET MODE SQUELCH PHONES SPEAKER GAIN USB BOTH LSB PREAMP NORM ATTN CE POWER 0 7 MHz WJ 8711A HF REC...

Page 244: ...tive or zero Allows adjustment or noise blanking value when lit Allows selection of IF bandwidth when lit Allows selection of detection mode when lit Allows adjustment of squelch level when lit Adjust...

Page 245: ...tomatically steps to channel 11 Select the 6 kHz IF bandwidth by pressing the IF BW key and rotating the Auxiliary Parameter Edit Knob Select the AM detection mode Set the squelch level to 95 dBm Set...

Page 246: ...after the dwell time is entered the MEMORY SCAN display automatically goes blank SCAN CHANNEL VIEW MEMORY SCAN i 10 01 500000 PROCEDURE CONTROL ACTIONS DISPLAY REACTION A G Press the CHANNEL VIEW key...

Page 247: ...LED becomes lit Select Channel 20 by entering 20 and terminate with the CHANNEL VIEW key Set Channel 20 to the include status by pressing the CHANNEL INCLUDE key Restart the scan operation by pressin...

Page 248: ...to execute an F1 F2 scan In the example the auxiliary parameters of the receiver are set first such as selecting th 6 kHz IF bandwidth AM detection mode 95 dBm squelch level and the fast AGC mode The...

Page 249: ...MHz displayed it is then cleared and the scan is restarted 3 LOCKING A FREQUENCY OUT OF THE F1 F2 SCAN 4 VIEWING AND CLEARING A LOCKOUT FREQUENCY 1 5 LCKOUT STORED FREQUENCY LOCKOUT PROCEDURE CONTROL...

Page 250: ...FO 5 Type 797006 X RF Tuner Assembly A3 Schematic Diagram 581274 Sheet 1 of 3 V FP 15 FP 16 blank WJ 8711A DIGITAL HF RECEIVER Courtesy of http BlackRadios terryo org...

Page 251: ...WJ 8711A DIGITAL HF RECEIVER FO 5 Type 797006 X RF Tuner Assembly A3 Schematic Diagram 581274 Sheet 2 of 3 V FP 17 FP 18 blank Courtesy of http BlackRadios terryo org...

Page 252: ...FO 5 Type 797006 X RF Tuner Assembly A3 Schematic Diagram 581274 Sheet 3 of 3 V FP 19 FP 20 blank WJ 8711A DIGITAL HF RECEIVER Courtesy of http BlackRadios terryo org...

Page 253: ...WJ 8711A DIGITAL HF RECEIVER FO 6 Type 797214 1 Digital Control Assembly A2 Schematic Diagram 581839 Sheet 1 of 4 F FP 21 FP 22 blank Courtesy of http BlackRadios terryo org...

Page 254: ...WJ 8711A DIGITAL HF RECEIVER FO 6 Type 797214 1 Digital Control Assembly A2 Schematic Diagram 581839 Sheet 2 of 4 F FP 23 FP 24 blank Courtesy of http BlackRadios terryo org...

Page 255: ...WJ 8711A DIGITAL HF RECEIVER FO 6 Type 797214 1 Digital Control Assembly A2 Schematic Diagram 581839 Sheet 3 of 4 F FP 25 FP 26 blank Courtesy of http BlackRadios terryo org...

Page 256: ...WJ 8711A DIGITAL HF RECEIVER FO 6 Type 797214 1 Digital Control Assembly A2 Schematic Diagram 581839 Sheet 4 of 4 F FP 27 FP 28 blank Courtesy of http BlackRadios terryo org...

Page 257: ...FO 7 Type 482108 1 Front Panel Circuit Card Assembly A2A1 Schematic Diagram 581267 Sheet 1 of 2 F FP 29 FP 30 blank WJ 8711A DIGITAL HF RECEIVER Courtesy of http BlackRadios terryo org...

Page 258: ...O 7 Type 482108 1 Front Panel Circuit Card Assembly A2A1 Schematic Diagram 581267 Sheet 2 of 2 F FP 31 FP 32 blank WJ 8711A DIGITAL HF RECEIVER RF INPUT MHZ KHZ Courtesy of http BlackRadios terryo org...

Page 259: ...FO 8 Type WJ 8711A Digital HF Receiver Main Chassis Schematic Diagram 581650 Sheet 1 of 3 G FP 33 FP 34 blank WJ 8711A DIGITAL HF RECEIVER Courtesy of http BlackRadios terryo org...

Page 260: ...FO 8 Type WJ 8711A Digital HF Receiver Main Chassis Schematic Diagram 581650 Sheet 2 of 3 G FP 35 FP 36 blank WJ 8711A DIGITAL HF RECEIVER Courtesy of http BlackRadios terryo org...

Page 261: ...FO 8 Type WJ 8711A Digital HF Receiver Main Chassis Schematic Diagram 581650 Sheet 3 of 3 G WJ 8711A DIGITAL HF RECEIVER Courtesy of http BlackRadios terryo org...

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