Racal Instruments RA6790/GM User Manual Download

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Summary of Contents for RA6790/GM

Page 1: ...s and levels will fonow also c If the sequence stops and displays a 2digit byte num ber the self check has detected an error condition EXTERNAL SPEAKER CONNECTIONS The LOUDSPEAKER OUT connections for...

Page 2: ...Inc SUPERCEDES ALL PREVIOUS EDITIONS This document contains technical intormation pertaining 0 tile ba ic RA6790 GM 111 R eceiver and to the IIIOdUied RA6790 GM 11 Receiver resultinq from the addition...

Page 3: ...affected page 3 New or changed illustrations are indicated by a pointing hand adjacent to the affected area 4 New or changed schematic diagrams are indicated by highlighting affected area 5 Added or...

Page 4: ...emove old pages and insert new pages as indicated below 2 New or changed text tabular information is indicated by vertical bar in the margin opposite binding edge of the affected page 3 Added or chang...

Page 5: ...s and insert new pages as indicated below e or changed textltabular information is indicated by vertical bar in the margin opposite binding edge of the affected page Added or changed pages are indicat...

Page 6: ...4 3 7 5 CHA 1GE IOT Ie E o A82 ISSUE W 1 SECTION IV 1 4 2 13 1 6 1 13 n 9 in 22 itS 14 REQUIRED CH A iGE CIRCUIT DESCRIPTION References to the upper limit of t e HF band should Change Change Should C...

Page 7: ...2 6 2 3 1 9 PHONES Jack Front Panel 2 6 2 3 2 Installation Options 2 7 2 3 3 RA6790 GM Receiver Options Installation Procedures 2 7 2 3 3 1 IF Bandwidth Filters 2 7 2 3 3 2 Remote Control Serial Asyn...

Page 8: ...TE Control Operation Serial Asynchronous Inte face SECTION IV CIRCUIT DESCRIPTION Introduction Functional Theory of Operation Primary Signal RF IF AF Section RF Signal IF Signal AF Signal Oscillator S...

Page 9: ...edures 5 4 1 Initial Check 5 5 5 4 2 BITE Check 5 6 5 4 3 Al Low Pass Filter Check 5 9 5 4 4 A4 Main IF AF Audio Check 5 10 5 4 5 A5 ISB Audio Check 5 10 5 4 6 A6A1 Remote Serial Asynchronous Interfac...

Page 10: ...ad Removal and Installation 5 30 5 7 24 1 Keypad Removal 5 30 5 7 24 2 Keypad Installation 5 30 5 7 25 IF Bandwidth Filter Removal and Installation 5 30 5 7 25 1 Bandwidth Filter Removal Optional Plug...

Page 11: ...4 14 4 4 Second Mixer Functional Block Diagram 4 16 4 5 A4 IF Circuits Functional Block Diagram 4 18 4 6 4 AF Circuits Functional Block Diagram 4 20 4 7 A4 AGC Circuits Functional Block Diagram 4 22...

Page 12: ...ponent Location A8 Receiver Control Assembly A9 Component Location A9 Power Supply Assembly Ala Top View Component Location Ala Component Location AlOA2 Schematic Diagram RF Low Pass Filter Al Schemat...

Page 13: ...ationally Based Fault Symptom Chart 5 32 6 1 RA6790 GM Receiver Assembly 6 6 6 2 Low Pass Filter Module Al 6 11 6 3 LPF Circuit Card Assembly AlAI 6 12 6 4 First Mixer Circuit Card Assembly A2 6 15 6...

Page 14: ...4 as co t i CD In N 0 1 i 0 _c o QJ QJ J QJ r c 0 0 r 0 A 3 QJ t1l o QJ 0 I l l 1 4 a i Q J II III C J QJ 0 o J en 00 0 a I S i J a l a I ii s E t l r J I 1 0...

Page 15: ...the Receiver includes a single loop digital 1st LO Synthesizer phase lock loop 2nd LO and BFa Synthesizers which in combination detennine tuned frequency to a resolution of I Hz The synthesized BFa t...

Page 16: ...the front panel controls or from an extended or remote operating position are processed by the microcomputer assembly Two separate buses carry control data and address information to and from the mic...

Page 17: ...Hz USB BPF 1 1 66 08669 10 300 Hz to 2200 Hz USB BPF 1 1 97 08771 Note that input and output matching capacitors are required with mechanical fIlters only contained on assembly A4 3 Selectable IF Ban...

Page 18: ...8415 08416 08417 08418 08419 08420 08589 a R5 232 Rs 422 R5 423 Serial Asynchronous Remote Interface Module b IEEE 488C 1978 Compatible 5 Improved internal frequency standard 3 parts 10 9 6 RF Amplifi...

Page 19: ...nd USB Upper Sideband DSB Double Sideband A 2 H Purpose o No modulation I Telegraphy on off 2 Telegraphy modulation 3 Telephony 4 Facsimile 5 Television 6 Duplex Telegraphy 7 Multichannel Telegraphy 9...

Page 20: ...utput odBm nominal into 50 Ohms CW Al Continuous Wave CW A2 Modulated Continuous Wave USB LSB upper lower sideband A3A A3H A3J A2A A2H A2J AM A3 Amplitude Modulation A4 Facsimile ISB A3B Independent S...

Page 21: ...idths are defmed as follows LSB USB 3 dB 450 Hz to 3000 Hz 50 dB 600 Hz to 4300 Hz The remaining five bandwidths are symmetrical BWI BW2 BW3 BW4 BWS 3 dB 60 dB 300 Hz 2 kHz 1 kHz 4 5 kHz 3 2 kHz 8 kHz...

Page 22: ...on with ground which provides dc voltage 10 volts to 4 volts to signal levels between threshold and 110 dB Similar connection for ISB channel when fitted Fault Indication of fault condition is availab...

Page 23: ...i sa l I iiij o 5 d d C I r JP Figure 2 1 T Ti Installation Drawing RA 6790 GM HF Receiver e e CENTER OF GRAVITY I s ley e e e I II O J Q I 0 EII I e lliII C I I L e e OPTIONAL REMOTE CONTROL INTERFAC...

Page 24: ...packaging material back in the shipping carton Save all material in the event that the Receiver must be reshipped See that the equipment is complete as listed on the packing slip Contact your RACAL r...

Page 25: ...1 Exterior Container Z5 1 Z long by 23 1 Z wide by 10 1 Z deep Z Top and Bottom Cushions 3 Intimate Wrap 4 Dessicant 5 RA6790 GM Radio Receiver Figure 2 2 Packaging Details RA6790 GM HF Receiver 2 2...

Page 26: ...it module board A6A2 3 INSTALL TION The Receiver is designed to be mounted in a standard 19 inch rack The sides of the Re t lver ha vt been drilled and tapped to accept standard slides The use of slid...

Page 27: ...0 1 1 JI It 1111 o 1JI 0 N I I 0 0 0 0 J If 1 I uUI 52 3t l k 0 0 Figure 2 3 Rear Panel Jacks Switches and Connectors...

Page 28: ...and fault status outputs The audio output frequency response at this connector is within 3 dB between frequencies of 100 Hzand 16kHz The fo1l6wirig audio outputs are available 1 Loudspeaker Output An...

Page 29: ...y provision for changing the reference frequency to either 5 MHz or 10 MHz is available by making link changes Refer to Paragraphs 2 3 4 and 2 3 4 5 Receiver System Connections on the A8 assembly 2 3...

Page 30: ...s available Mounted on the A4 board the fIlters are accessible from the top of the Receiver To gain access to the A4 board loosen the six quarter turn fasteners holding the top cover to the Receiver a...

Page 31: ...1 1 6 800 08410 0 4 kHz Symmetrical BPF 1 2 5 2000 08411 1 1 kHz Symmetrical BPF 1 2 1000 08412 f 3 24 kHz Symmetrical BPF 1 1 33 1000 08413 6 8 kHz Symmetrical BPF 1 1000 08414 16 0 kHz Symmetrical B...

Page 32: ...FLl FL2 FL3 FL4 FL5 FL6 FL7 Figure 2 4 Location of IF Bandwidth Filter Slots 2 9...

Page 33: ......

Page 34: ...ard assembly on any conductive material Failure to comply may result in shorting the battery contained on this card 3 Check the rear panel of the Receiver A blank plate may be covering up the hole loc...

Page 35: ...al Crystal Filter Location ASJ3 I AS Circuit Card Assembly Optional ASJl A4J6 A4J8 ASWl A9Wl Figure 2 6 Receiver Options Installation Detail 2 12 Circuit Card Assembly Optional Circuit Card Assembly M...

Page 36: ...Link 1 Figure 2 7 A6A2 Circuit Card Assembly Jumpers 2 13...

Page 37: ...N I J I j fr pt 1 Li ok 2 Link 3 Link 5 Figur e 2 8 A6Al Circuit Card Assembly Jumpers...

Page 38: ...the steps necessary to install the AS circuit card assembly Refer to Figures 2 5 and 2 6 for the location of cables and connectors 1 Place the metal baseplate shield curved edge upwards on the four st...

Page 39: ...ii 2 16 ell Q c 6 Q ell tl lj 1 1 ro U u c J 1 1 C N C lj c ro C 00 c u g C I N Q 1 1 00...

Page 40: ...potentiometer on the receiver front panel for 1 mWaudio output level as indicated by the 0 dB line on the AF meter scale in the Mode LCD e Turn POWER switch to off and disconnect the generator For I...

Page 41: ...e shown does not match the available line voltage remove the pc wafer and reinstall it so that the line voltage closest to the available line voltage is visible with the pc wafer in position Install t...

Page 42: ...g 0 D 0 0 9 2 19 c 0 Cl c c m O J en CIl o u a z S a z o u a z o o...

Page 43: ...ble wires to the connector as required refer to Table 2 3 The con nector pin numbers are indicated on the front of the connector 3 Slide the connector back into the connector shell Place one of the sp...

Page 44: ...peration 18 Output Loudspeaker Output Same as Monitor Line 6 Signal Ground Output 7 8 9 Ground 10 11 12 13 Not Connected 19 20 24 25 21 Main IF Diversity AGe Monitor Input ISB Lower Sideband Diversity...

Page 45: ...hell over the cable to be used for the remote controL 2 Solder the wires to the appropriate connector pins in accordance with Figure 2 11 and Tables 2 5 and 2 6 for the interface to be used The connec...

Page 46: ...MS188C RS232C RS423 RS422 System Gnd System Gnd System Gnd Not Used Data Out A Data Out A Data Out Gnd Data Out Gnd Not Used Data Out Not Used Data Out B Jumper to F Not Used Not Used Jumper to E Dat...

Page 47: ...TA IN B GND RECEIVER NUMBER 01 1 RECEIVER NUMBER D1 2 RECEIVER NUMBER D1 4 RECEIVER NUMBER DI 8 RECEIVER NUMBER D2 1 RECEIvER NUMBER D2 2 RECEIVER NUMBER D24 RECEIVER NUMBER D2 8 IPARlIT SELECT EVEN O...

Page 48: ...NCY 101 11 Bfa Hl V6 6 zrn g lf u fj a q OJ to 1 1 ADe 001 TUNINO AN cw LOW I 0111 11 Luh ___ GAIN AF oJ J J OlJ RA6790 GM l lG8 Figure 3 1 Front Panel onlr s and 1I1dkalors HA 17 JO M 7 PI AA UI I 4...

Page 49: ...e Switch Double pole single throw toggle switch which provides on off control for the Receiver by on trolling pnmary power source to the power supply During initial installation be sure the line voltJ...

Page 50: ...OZ4 tO A BGJ J01 1 10 01 c WOOl TV N AM rAST c _ SlOW fAULT SttORl I l SO UIQ EJEJEl WOllUlO r oro CD0 ll w I I _ 1 1 N IEJEl B J f GAIN A HlEft ENTER _ MAtH 1 10 01 1 CJI 0 0 I POWER LINE LEVEL I I R...

Page 51: ...er sideband channel De pressing ISB U L a second time will change the display and connect the PHOt rES jack to the LSB channel The monitor line and loudspeaker outputs through rear panel connector 13...

Page 52: ...able the numeric keys The first numeric key depressed will be recognized by the Receiver as the ten s MHz digit Since the Receiver cannot be tuned above 29 999999 MHz the Receiver will recognize only...

Page 53: ...er If both the words MAN and either SHORT MEDIUM or LONG are present under the word AGC in the display the Receiver is being operated in an automatic gain control mode with a manually set threshold d...

Page 54: ...able Receivers Actual control of the Re ceiver s parameters is performed by control software contained in Eraseable Programmable Read Only Memory EPROMs within the Receiver Additionally a self diagnos...

Page 55: ...3 The Receiver is in the LOCALoperatingconditionwhiChisaccomplishedby observing the MODE LCDta determiheiftheword REMOTE ispresent fthe word REMOTE is not present in the display proceed Witld he desi...

Page 56: ...he second narrowest ftlter BW3 the third etc NOTE the number of ftlters installed dictates the number of active BW switches If one or more ftlter slcits FLI thro ugh FL7 on the A4 module are empty one...

Page 57: ...l indication or low signal indication replace the AS module Refer to Section II Paragraph 2 3 3 3 for installation procedures c Connect a headset to the PHONES jack on the receiver front panel and adj...

Page 58: ...POWER ON switch on the receiver front panel to the ON position k Observe the Mode LCD The word REMOTE should not be present If the word REMOTE appears in the display momentarily depress and then relea...

Page 59: ...e Receiver is placed in the REMOTE condition the controls on the Receiver itself are non functional Determination of which condition the Receiver is in Le LOCAL or REMOTE can be made simply by checkin...

Page 60: ...n process are a The word REMOTE will appear in the Mode LCD b The frequency LCD will begin displaying a series of rapidly changing digits in both the FREQUENCY and BFO portions of the display e Rapidl...

Page 61: ...utomatically appe in the display without a decimal point entry from the operator EXAMPLE I Desired Frequency 14 2514 MHz Keystrokes Required ENTER 1 4 2 5 1 4 o o Resulting Display in FREQUENCY LCD 14...

Page 62: ...ely 10 8 MHz using manual tuningkn b 3 Select SLOW tune rate 4 Tune to approximately 10 85MHiusmgManualTunirigKnob 5 Seh ct finetuningrate 6 Tune to 10 853000 MHz using Manual Tuning Knob g Select Det...

Page 63: ...should disappear In addition another word LONG MED or SHORT should be displayed under AGC on the display 2 Select the response time by depressing and releasing the desired pushbutton switch LONG MED o...

Page 64: ...ord AGC in the mode LCD b The word LONG MED or SHORT is displayed under the word MAN in the mode LCD 1 CWo Select the CW mode by depressing and releasing the CW pushbutton switch Indications that the...

Page 65: ...omentarily press and then release the BFO CENTER pushbutton switch on the righthand keypad A single zero preceeded by a sign should now be displayed 2 Observe the mode LCD and look under the word TUNI...

Page 66: ...Each sideband is independently controlled in this mode Therefore separate AGC settings are possible for both I USB and I LSB l Select the FM mode by momentarily depressing and then releasing the FM pu...

Page 67: ...ots 19ad by depressing the ENTER pushbutton switch only 3 Terminating Forced IF Ban pass Filter Bandwidth Setup a Depress and release ISB U L pushbutton switch on the left hand keypad and observe AUX...

Page 68: ...The minimUm considerations when discussing RA6790 GM HF Receiver remote operation are 1 Remote Control Data Character 2 Remote Control Device Change 3 3 18 2...

Page 69: ...ussion on RA6790 GM HE Receiver iesponsestoremote control commands addresses the ASCII characters sent back to the controller ratherthan on specific displays generated by the receipt of those response...

Page 70: ...Start Bit ASCII Data Bit 0 ASCII Data Bit 1 ASCII Data Bit 2 ASCII Data Bit 3 ASCII Data Bit 4 ASCII Data Bit 5 ASCII Data Bit 6 Parity Bit Stop Bit Stop Bit Figure 3 3 Data Character Fonnat 3 20...

Page 71: ...6 46 38 BEL 07 7 47 39 BS 10 8 50 40 HT 11 9 51 41 LF 12 10 52 42 VT 13 11 53 43 FF 14 12 54 44 CR 15 13 55 45 SO 16 14 56 46 51 17 15 57 47 DLE 20 16 f J 60 48 DCl 21 17 1 61 49 DC 22 18 2 62 50 DC3...

Page 72: ...g 147 103 H 110 72 h 150 104 I 111 73 i 151 105 J 112 74 j 152 106 K 113 75 k 153 107 I L 114 76 1 154 108 1 115 77 m 155 109 116 78 n 156 110 0 117 79 a 157 111 p 120 80 p 160 112 Q 121 81 q 161 113...

Page 73: ...Forced bandwidth setup discussed in Section V 58 Enable remote AGC dump 59 rnhibitrernote AGC dump Status commands may be sent to only one Receiver at a time since some of the status com mands will re...

Page 74: ...up the following Filter Slot FLI FL2 FL3 FL4 FL5 FL6 FL7 Filter Function Lower Sideband LSB Upper Sideband USB 1 7 kHz Symmetrical 400 Hz Symmetircal None 3 2 kHz SymmetircaI Unchanged from previous...

Page 75: ...mode data only Tl _ requests IF bandwidth data only non functional in ISB mode TM requests IF gain control mode data only TB _ requests BFO data only functional only when Receiver is in BFO variable...

Page 76: ...This Page Intentionally Left Blank Change 3 3 24 2...

Page 77: ...select the Receiver s operating frequency The frequency command may specify the desired frequency down to 1 Hz For example thecommand F03 415926 would tune the Receiver s to 3 415926 MHz If an exact f...

Page 78: ...e N represents the approximate amount of attenuation N XO 8 in dB to be added to the circuit For example the command A3 would add approximately 3 dB of attenuation to the amplifier circuit AI04 would...

Page 79: ...found BITE error codes 4 17 and 33 Refer to Section V for explanation of BITE error codes G triggers a data stream in the following fonnat F D M 1 B A S where F is receiver frequency in MHz D is rece...

Page 80: ...id i e 12 since override mode is impossible while in LOCAL control The next status response to be considered is TX where X is the desired parameter s which triggers a data stream in the following form...

Page 81: ...elected by sending one of the following commands 0 1 Selects envelope detector 0 2 Selects continuous wave detector 0 3 Selects frequency modulation detector 0 4 Selects ISB operation Note that these...

Page 82: ...circuit card assemblies A7 and A8 from the first local oscillator signal to the flrst mixer the second local oscillator to the second mixer and the beat frequency oscillator function for CW operation...

Page 83: ...I I r l I A6A2 I I A6A1 I A9 j4 11 L I I I I I L ____________ J L _____ J L ____ 1 RECEIVER CONTROL Nomenclature Function RF Low Pass Filter Primary Signal First IF Mixer Primary Signal Second IF Mixe...

Page 84: ...is coupled to an IF amplifier to restore gain and for coupling to the plug in band pass filters contained on circuit card assembly A4 The IF signal from A3 is coupled directly to seven bandwidth llter...

Page 85: ...gh a variable attenuator placed in the line to the second amplifier by the crosspoint switch Attenu ation is varied through a screwdriver adjustment on the front panel This amplifier then drives an ou...

Page 86: ...5 MHz external reference signal may be applied through the REF IN OUT connector on the rear panel The INTIEXT slide switch 52 also located on the rear panel must be in the appropriate position for th...

Page 87: ...the automatic mode the AGC circuits will compensate for changes in the receiverinput signal level In the automatic manual mode the front panel control is used to set the operating threshold of the AG...

Page 88: ...receiver operations by executing the control program that it obtains from the Erasable Program Read Only Memory EPROM During local operation the receiver is controlled by the microcomputer as follows...

Page 89: ...rocessor will respond and return the stattis ofthereceiveras described in the above paragraphs Remote commands received during LOCAL operation will be stored in memory but they will not be acted upon...

Page 90: ...s and data The UART and interrupt logic on the A6AI module will supply the CPU with the interrupt routine starting address by placing this interrupt vector address on the CPU data bus when the CPU ack...

Page 91: ...uring the bandwidth of all of the IF fIlters In order for the receiver to pass the above tests all modules must have been operating properly However AI A6AI A4 and AS are not interrrogated BITE may be...

Page 92: ...ted by the out of Iock circuitry on the BFO board A failure in any of these tests is indi cated as an error code to the operator or to the remote controller on request c First Local Oscillator Testing...

Page 93: ...ng to the maximum numoer 6fsymmetrical nIters installed Future nIters which may have different band widths from the nIters presently defmed may be used in this system without any change The bandwidths...

Page 94: ...below 40 MHz The output of this filter is coupled to a common emitter amplifIer Q2 through capaci tor C9 and resistor R3 The mixer drive amplifier is comprised of transistors Ql Q2 Q3 and Q4 The loc...

Page 95: ...MHz FILTER RF BANDPASS MIXER FILTER I 40 956 10 466 MHz DRIVE AMP F lLTER T FIRST LOCAL OSCILLATOR 40 955 to 70 465 MHz FROMA1 40 455 MH Figure 4 3 First Mixer Functional Block Dia ram IF AMP 40 455...

Page 96: ...tof integrated circuit miXer U3 A 40 MHzslgnru from the second local oscillator is connected to a second input of the same mixer It is this difference fre quency that is used as the carrier for the se...

Page 97: ...40 455 MHz TO A3 AMP f to FILTER AGCCONTROL I AGCBIAS l AMP j AGC AMP AGC AMP 40 455 MHz L l I FILTER FROM A4 AGC MIXER r t 4 Figure 4 4 Second Mixer Functional Block Diagram 455kHz FILTER AMP 455 kH...

Page 98: ...order of bandwidths regardless of the order in which they are plugged into the sockets that is when BWI is selected from receiver control the narrowest bandwidth contained in the seven sockets six if...

Page 99: ...5 ISB 1 LINK 465 kHz AGC I 465 kHz I BUFFER 1CONTROL AMP LED AMP FILTER TOAGC IF 1456 kHZ IF OUT OUTPUT TOJ2 AMP BUFFER 456 kHz AMP 1 FROMA8 BFO RF SWITCH FROMA9 RECEIVER CONTROL Figure 4 5 A4 IF Circ...

Page 100: ...t switch U2S This switch through Receiver control controls audio switchingfromA4 circuits described above and from the optional AS circuit card when installed In rton ISB modes the sWitch routes the A...

Page 101: ...TECTOR SELECT A FROMA9 RECEIVER CONTROL FROMA5 IS8 AUDIO FILTER AUDIO AMP AUDIO ATTEN UATOR CROSSPOINT SWITCH A FROMA9 RECEIVER CONTROL Figure 4 6 A4 AF Circuits Functional Block Diagram DRIV E AMP DR...

Page 102: ...ted to ground through transistor Q2 which turns on transistor Ul aD and a short delay is asserted using combination resistors R52 and R55 When medium time decay is selected transistor QI0 and transist...

Page 103: ...I ATOR 1 1 TRANS ISTOR It SWITCH AGe I AGC D ISTR FILTER AMP IRF AF AF RF FROM METER U26 COMP DIGITAL AGe TO IFAMPU8 AGC TOAGC AMPONA3 AGC TO 158 AGe OIVAGC TOJ7 DATA TOA9 IF L GAINI 1 1 TO IOIAI DAe...

Page 104: ...IF amplifier a BFO amplifier a product detector an audio amplifier two audio line drive amplifiers and AGC circuits The IF signal is routed from bandpass fUter FLI by the fUter selection switch locat...

Page 105: ...z BUFFER AUDI AUDIO AUDIO CONTROL AMP DETECTOR p AMP LED AMP j DRIVE AUDIO AUDIO AMP AMP j AU AUDIO AMP FROM ISBAGC FROM A4 BFO FROM A4 AUDIO 465 8 kHz Figure 4 8 ISB Functional Block Diagram LINE TOA...

Page 106: ...ratio a non integer number 50 123467 0 1 x n therefore n 501 23467 If we split this number into its integer part and its decimal part the result is a three decade integer and a fIve decade decimal num...

Page 107: ...LOG LOW PASS CONVERTER FILTER DIVIDE L BYN NOTE FOR NORMAL OPERATION fo f x N WHERE fo OSCILLATOR FREQUENCY fr REFERENCE FREQUENCY N DIVIDE BY NUMBER fo Figure 4 9 Typical Phase Lock Loop Functional B...

Page 108: ...he front panel RF frequency is set to 10 426800 MHz then the actual ioaded data is 39 255 MHz above this frequency which is 49 680800 The first IF frequency is 40 455 MHz so we can see that a further...

Page 109: ...O 1 ADDER L 4 BIT DATA BUS REGISTER It ACCUM CARRY 4 ALATOR I OUT NO 2 IF Fo1VCO ADDER f FREQUENCY 4 BIT DATA BUS 2 MODULUS 3 DECADE DIVIDER 4 BIT DATA BUS 8BIT ANALOG DIGITAL TO DATA i TO ANALOG CONV...

Page 110: ...trol signalbytwc sothat all four registers in U22 can be loaded The read cycles to these registers are controlled by the R0A R0B RIA andR1B inputs of U22 The R0A and R0B inputs are fixed and the RIA a...

Page 111: ...NAL l I SHAPER ILineariserl WINDOW DETECTOR L TRAN SISTOR SWITCH FILTER AMP BUFFER AMP VCO fo fo I OUTPUT rO 955 TO AMP TOA3 70 455 MHz _ 1 SLEWING AMP Fd fREQUENCY DIVIDED Fo fREQUENCY OSCILLATOR Fr...

Page 112: ...l be high voltage when the selected frequency is at 30 MHz and low when the system requires 0 5 MHz This DC voltage is then passed through U37B which along with its associated resistors and capacitors...

Page 113: ...ynthesizar circuits described on this page This information is subiect to limited rights in technical data DAR 7 109 All Figure 4 12 Detailed Timing Diagram UK and US patents haw been applied for cowr...

Page 114: ...he base of Q 1 is grounded through R7 which turns voltage regulator U1 on The voltage from this regulator enables the temperature con trolled crystal oscillator Approximately 30 minutes are required f...

Page 115: ...DIVIDE BV 10 I OMHz row 1 4 1 oEXT SEE NOTE Y 1MHz REF TO BFOAND A7 fi iglll c 4 13 S c nd Local Oscillator FUll 20 MHz VCO 20 MHz BUFFER 1 20 MH I FRED 1 40 MH AMP DOUBLER TO A3 DIVIDE BV 2 NOTE I MH...

Page 116: ...however data select C is now high Linking LKI selects 06 10 MHz LK2 selects 05 5 MHz or both LKI and LK2 select 04 1 MHz The 00 01 and 02 inputs to U5 cannot be selected when data select C is high ext...

Page 117: ..._L____ __ __ ____ __ ________ REFCLK L__ __ __ __ __ __ __ __ __ fLjl n rL REF Q osee REFO OSCILLATOR LAGGING FREQUENCY LOWI OSCCLK __ __ __ __ __ L__ __ __ __ __ i__ REFCLK L__ __ __ ___L__ __ __ __...

Page 118: ...to analog converter which consists of transistors Q7 Q8 and Q9 resistors R33 through R39 and capacitors C24 through C26 The Q output of reference flip flop U3A is connected to the emitter of Q7 throug...

Page 119: ...CONTROL BFO ENABLE VCO CONTROL SWITCH 22 75 MHz VCO 22 75 MHz 400 KHz 1 BUFFER AMP vcri REFERENCE rigurc 4 15 III 11111 11 11 11 i d J ia r llIl SHAPER AMP 22 76 MHz 400 KHz I J DIVIDE BY 455 8KH z T...

Page 120: ...bed in Paragraph 3 The second out put is coupled through capacitor C60 to a shaper circuit Q20 R72 R73 R74 and C61 This circuit shapes the waveform into a square wave for the TTL logic of the divide b...

Page 121: ...not in sequence with the clock pulse will be rejected The output of Ul2A is routed through inverter U12D to one clock input of the phase comparator as the oscillator reference frequency 4 Reference F...

Page 122: ...ingle throw switch with normally open momentary contacts One contact of each switch is commonly connected to ground within each keypad set The other contact of each switch is connected to an input of...

Page 123: ...S I t i I INTERRUPT I VECTOR ADDRESS U13UI4 TRI STATE STROBE BI DIRECTIONAL I RECEIVER LATCHED LOGIC H TRI STATE ADDRESS I SWITCH Ul0 U11 U 2 SWITCH U4 U11 U13 U13 I _ t _ I L U45A l E L DATA BUFFERS...

Page 124: ...l annunciator displays while the thirteen 7 segment drivers provide decoding and drive for all numerical displays Multivibrator U26 timed by Rl and C8 provides a 100 Hzsignal to theDF display frequenc...

Page 125: ...CLOCKWISE U59 r U6D I COUNTER CLOCKWISE U59 U60 I L Figure 4 17 Encoder Output Signals 4 44...

Page 126: ...gnal for circuits on that card The QO output of U64 is also routed to A7 through inverter US6 as a strobe signal to those same cir cuits These circuits on the A7 circuit card further process the seria...

Page 127: ...lCD ANNUNCIATOR OR NUMERIC DRIVE BACK PLAN E BP TO LCD l 1 I I I I L I __ SIGNALS ARE 1800 OUT OF PHASE JI I 1 I I DISPLAY ON J I I I I I I I I SIGNALS ARE IN PHASE I I J I I I I DISPLAY OFF Figure 4...

Page 128: ...of Lock OOL Functions Three out of lock circuits that monitor the condi tion ofthephaselock loops of the three oscillators drive OOL indicators on the A9 circuit card and supply their output data to t...

Page 129: ...uide is available from the Fairchild Camera and Instrument Corporation Mountain View California The CPU U I controls receiver operation by readingthe operating program and routing data and control sig...

Page 130: ...s CPU READ and MEM W outputs Thus the memory units when addressed and directed place data on the CPU data bus or accept data from the CPU data bus DBO DB7 The EPROMs place 8 bit instruction words on t...

Page 131: ...Y1 r I PULSE WIDTH RIOO r WAITE PEAIOD SHOAT i WA TE k s s_ WALSITEE 1 WAITE PERIOD LONG W DTH Figure 4 19 Central Processor Unit Timing Signal Diagram 4 50...

Page 132: ...current CR3 is back biased andthe 5 volt supply through CR6 and R9 charges the internal battery BTl The Schmidt trigger Oland Q2 detects volt ge varia tio kinthe 5 y61turiregulatedline The collector o...

Page 133: ...0 0 0 0 0 0 0 po RESULTS BUS ALU 161 iii II a i 1Q x O 000 0 0 0 0 II iI a W X W J IL 5 l I CI it 8 U 0 0 S E E E E E o 0 0 0 0 a a a a a 64 X I BIT SCRATCHPAD REGISTERS d CD W U a ISAR ti 13 a Figure...

Page 134: ...rity bit followed by two stop bits Coding for the data word is described in Section III Paragraph 3 3 3 2 The UART parallel inputs and outputs are tied together and onto the common microcomputer data...

Page 135: ...FER BUS STACK REGISTER PC1 AUX DATA COUNTER DC1 _____________ INCREMENTER ADDER LOGIC UPPER BYTE LOWER BYTE o N M w m m 0 N M TIMER Figure 4 7 1 System Memory Interface Functional Block Diagram ADDRES...

Page 136: ...s to each of gates UI SB and UI SC The other input to these gates is the inverted IICB signal from the microcomputer If the CPU is currently blocking thus ignoring interrupt requests IICB will be high...

Page 137: ...ck Diagram III c J MASTER III a C CD RESET 011 III c J S J Z wZ 21 MR m m 0 111 C CIJ a a III CD III M N j J_ J 0 c III a m a a a a m a a a a CIJ a C ili w a CD CD a m CD m m III C Z c a 111 a a III a...

Page 138: ...s from an ac line input steps down the voltage rectifies the ac fllters and regulates the various divided voltages The unit contains a circuit card switch which provides for switching the transformer...

Page 139: ...REVENTIVE MAINTENANCE SCHEDULE Procedure Interval Comments Inspection for Damage 60 days Interval variable depending on operating or Wear environment Cleaning 30 days Interval variable depending on eq...

Page 140: ...lution Avoid using abrasive cleaners They will scratch thefront paneL 2 Interior Dust in the interiorofthe unitshould be removed before it builds up enough to cause arcing and short circuits during pe...

Page 141: ...may require the use of external test equipment to supplement BITE Table 5 2 lists suggested test equipment by type and required operational characteristics Not all test equipment listed is required fo...

Page 142: ...s to augment the results of BITE test procedures Since BITE is not a panacea for all electromechanical problems a degree of interpretation is necessary by maintenance personnel The scope of the analys...

Page 143: ...F a The Receiver indicates that it is in the REMOTE mode and depressing the LOCAL REMOTE pushbutton does not change the display either the A6A2 Microcomputer Assembly or the A9 Front Panel Assembly is...

Page 144: ...n either the A4 Main IF Assembly 60 probability or the A9 Front Panel Assembiy 40 probability is at fault and should be replaced NOTE Failure to attain the desired range defmitely indicates that proce...

Page 145: ...led TABLE 5 3 BITE ERROR CODE IDENTIFICATION Description First Local Oscillator synthesizernot locked after 100 milli second delay from 500 kHz step change Second Local Osci11ator reference synthesize...

Page 146: ...ror A2 A3 and A4 are fully functional 16 Filter slot one contains no fIlter Wrong or bad fIlter 1 7 Two or more LSB fIlters have been found in the system Wrong or bad fIlters 18 Two or more USB fllter...

Page 147: ...quency sweep underflowed while attempting to measure Bad filter A4 bandwidth of f t1ter in filter slot three 34 BITE frequency sweep underflowed while attempting to measure Bad filter A4 bandwidth of...

Page 148: ...y wired remote terminal to the Receiver via connector A6Al W111 on the rear panel 3 Enter 99GCR on the terminal keyboard and observe the results on the remote display If data is displayed A6Al is func...

Page 149: ...J1 120 V NOM AC I A6A1W1J1 RECEIVER UNDER TEST RA6790 GM J2 REF IN OUT f I I I 1 MHz REF I AF LINE I OUTPUT 56011 IF OUTPUT 50n Figure 5 1 Standard Test Equipment Configuration 5 11 3911 OSCI LLOSCOPE...

Page 150: ...hin the limits I kHz t 10Hz at each setting TABLE 5 4 TUNED FREQUENCIES Receiver Generator Tpned Frequency AF Output 00 500000 MHz 1000 10 Hz 01 000000 1000 10 Hz 11 111111 1000 10 Hz 22 222222 1000 t...

Page 151: ...enerator for an output of 1 5 MHz at 100 dBm CW Connect the signal generator to RF IN connector 11 on rear panel 4 Using the remote controller adjust the manual gain control on the Receiver fully cloc...

Page 152: ...emoving WI OPI 3 Connect the frequency counter to A4J6 to monitor the BFO frequency 4 Using the receiver front panel controls s lecteach BFO indication listed in BFO Indicator column of Table 5 5 and...

Page 153: ...e AF gain control through the control range Observe that the phone output level varies smoothly over the full control range 5 5 9 Audio Distortion 5 5 10 1 Set up the equipment as shown in Figure 5 1...

Page 154: ...stallation of the individual circuit card assemblies used in the RA6790 GM HF Receiver A complete list of these assemblies is contained in SECTION VI Replacement Parts List of this instruction manual...

Page 155: ...Perform the Preliminary Procedure as directed in Paragraph 5 7 1 2 Remove both the receiver top and bottom covers as directed in Paragraph 5 7 2 3 Disconnect 5MB connector Al W2PI from J5 on the recei...

Page 156: ...lj ljS lj tl1 dBm 1 dBm III lj a II J4 z z J3 1 l BfO A1 J2 J2 1 8 1 MHl J4 23 dBm Jl 8 10 dBm J5 Jl POWER SUPPLY L J1 lMH REF 2 dBmNOMINAllYI Al0 AIOJI POWER SOURCE AIOAI r mm C 4 h 20 REG CONTROL DA...

Page 157: ...s may cause damage to the A2 module printed circuit track or components 5 7 6 A2 Module Installation Installation of the A2 module is the reverse of removal with the following notes I Ensure cable W2P...

Page 158: ...Ensure cable A3WIPI is routed through the notch in the frame prior to installation of both the A2 and A3 module covers Failure to do so may result in damage to the cable 5 7 9 A4 Module Removal I Per...

Page 159: ...and connectors are clear of the A4 module during installation Failure to do so may result in having to remove the module again to properly position the cables AS Module Removal 1 Perform the Prelimin...

Page 160: ...module NOTE The A6 module is composed of two separate printed circuit boards A6AI and A6A2 joined in the middle by A6Pl which is a fifty 50 pin connector If it is desired to separate the two boards gr...

Page 161: ...even 11 screws and hardware and the nylon mounting post from which the A7 module cover screw was removed in Step 3 above which holds down the A7 module NOTE The screw through A7U39 is not a module hol...

Page 162: ...e which hold down the AS module 10 Lift out the AS module 5 7 18 A8 Module Installation Installation of the A8 module is the reverse of removal with the following note NOTE When positioning the AS mod...

Page 163: ...wheel 12 Carefully remove the encoding wheel CAUTION Do not pry on the encoding wheel as the hidden side of the encoding wheel is part of the manual tuning encoder Damage to the encoding wheel may im...

Page 164: ...U1 I N 0 ij i Z A t t i Yellou White Light blue Figure 5 3 Wiring Detail A9 Cl rell i t Card Assembly I p oJ White Blue White Green...

Page 165: ...ble W20 A9 Circuit Card Circuit Side Keypad S4 Under Plate POWER ON Switch IF Gain Control LCD U4 Edge Lighting Assembly LCD U3 Figure 5 4 Front Panel Assembly Partially Disassembled I Phones Jack S3...

Page 166: ...in connectors A912 and A913 before installing holddoWn screWS and hardware 3 Tighten tuning shaft assembly retaining nut only finger tight CAUTION EnsUre that the n ylonwasheri in place betweeri the...

Page 167: ...the A4 module or the cooling fms on the rear of the AIO module CAUTION When installing the AIO module cover ensure that the lower edge of the cover clears the nylon cable clamp on the small ribbon cab...

Page 168: ...le 4 Loosen and remove the one I non captive screw in the Bandwidth Filter Cover on the side opposite the two captive screws Be careful not to lose the lockwasher and flatwasher which fit between the...

Page 169: ...used for LSB operation over fIlter position FLI the fIlter position closest to the rear of the Receiver Make certain that the large pins are aligned with the large sockets and the smaller pins are al...

Page 170: ...k 2 PC wafer in wrong mostly zeros in position Frequency LCD A6A2 Unable to estab 1 2 A6A2 A9 Ush LOCAL operat ing condition FAULT LED 1 2 Synthesizer failure illuminated A7 A8 S2 switch in wrong posi...

Page 171: ...m BFO 1 A8 ConfIrm CW in CW mode signal present and not in BFO CENTER Displayed IF band 2 Check fIlters A4 width does not match any in stalled fIlter Unable to enter 3 2 ConfIrm Receiver not frequency...

Page 172: ...blies or modules subassemblies or submodules This method is composed of assigning a class lerr r such as R for resistor or C for capacitor followed by an identifying number I 2 3 4 etc This partial re...

Page 173: ...WARNING UHf VOlTAtn Figure 6 1 RA6790 GM Receiver Top View 6 2...

Page 174: ...Figure 6 2 RA6790 GM Receiver Bottom View 6 3...

Page 175: ...AlO FLl FL7 Under Cover Al A4 AS A9 Figure 6 3 Location of Modules Top View 6 4 A6AI _ A6A2...

Page 176: ...A7 Al MOUNTING SCREWS A9 A2 Figure 6 4 Location of Modules Bottom View 6 5 A3...

Page 177: ...for further breakdown Power Supply Module Assembly see Table 6 15 for further breakdown capacitor Feed thru 001 uP 20 capacitor Ceramic 01 uP 50 WVoc 20 Erie Connector N BNC Bulkhead RF In Connector B...

Page 178: ...Hz Filter Mech Symmetrical 6 0 kHz Filter Mech USB 450 Hz to 3000 Hz Filter Mech LSB 450 Hz to 3000 Hz Capacitor Mica 270 F 2 Capacitor Mica 270 pF 2 Capacitor Mica 110 pF 2 Capacitor Mica 360 pF 2 Ca...

Page 179: ...Figure 6 5 Low Pass Filter Assembly Ai 6 9...

Page 180: ...6J S I J GD 00 J It ot en I iJ e C O 1 tJ C t tr III Figure 6 6 Component Location Diagram Al 6 10...

Page 181: ...RTS LIST RP LOW PASS FII TER MODULE ASSEMBLY Al Reference Description RACAL Manufacturer uesignation Number MIL Part No AlA RF Low Pass Filter Circuit Card Assembly 08475 see Table 6 3 for further bre...

Page 182: ...2 22101 CMROSF lS1 GODR C4 Capacitor Mica 7S pF 500 WVDC 5 22020 CMR05E SoGoDR 1 C6 Capacitor Mica 91 pF 500 WVDC 2 22123 CMROSF91OGODR C7 Capacitor Mica 120 pF sao WVDC 2 22113 CMROSF121GODR I C8 Cap...

Page 183: ...S t t S N e L9 1 t HOJN d lVJV Figure 6 7 First Mixer Assembly A2 6 13...

Page 184: ...po nJ l 10 I D N 0 I t l 11 I N i II n TJ i JJ I IV z I I lUI fll I u 0 en fll iE Om II I E1 Ci i pI I 1o nnnnRI lei I J2 r 8 uo _3 8 L t FLI UI 1 rF J Figure 6 8 Component Location A2 j...

Page 185: ...Mica 100 pF 500WVDC 2 22109 CM05EDI0IJ03 C24 Capacitor Mica 91 pF 500 WVDC 2 22123 CMR05F9l0GODR C26 Capacitor CMR05E430GODR Mica 43 pF 500 WVDC t2 22137 C27 Capacitor Mica 68 uF 500 WVDC t2 22107 CM...

Page 186: ...CR20G150JS R7 Rll Resistor Film 220 ohms 2 1 4W 12161 221 RLR07C221GR I R14 R15 R8 R10 Resistor Film 1 2K 2 1 4W 12161 122 RLR07C122GR R9 Resistor Trimmer SK 10 16090 502 RJSOFPS02 R12 R13 Resistor Fi...

Page 187: ...Figure 6 9 Second l tixer Assembly A3 6 17...

Page 188: ...I I 0 z c 0 I 0 00 Figure 6 10 Component Location DiagraQ A3 6 18...

Page 189: ...DC 20 Capacit9r _Mica 68 pF 500 WVDC 2 Capacitor Mica 82 pF 500 WVDC 2 Capacitor t1ica 330 pF 500 WVDC 2 Capacitor Ceramic 0 1 uF sao WVDC 20 Capacitor Mica 22 pF 500 WVDC 2 Capacitor Mica 15 pF 500 W...

Page 190: ...istor Film 2 2K 2 1 4W 12161 222 RLR07C222GR R28 R9 Resistor Film lOOK 2 1 4W 12161 104 RLR07C104GR R14 Resistor Film 27 ohms 2 l LM 12161 270 RLR07C270GR I R15 Resistor Film 560 ohms 2 1 4W 12161 561...

Page 191: ...R43 Resistor Film 1 5K 2 1 4W 1216 1 152 RLR07C152GR Tl Transformer RF Variable 08503 T2 Transformer Assembly 08530 Ul IC Transistor Array RCA 36785 CA3046F U2 IC Quad Op Amp RCA 36764 CA324E 3 IC Se...

Page 192: ...Figure 6 11 Main IF AF Assembly A4 6 23...

Page 193: ...6 24 t o LJ ce u 3 LJ t III t o c E o u...

Page 194: ...95 thru C9B Cl06 C43 CS 1 CS3 C69 C70 C44 C47 Capacitor CeraJllic 0 1 uF 50 WVDC 20 Capacitor Tantalum 15 uF 20 WVDC 20 Union Carbide Capacitor Electrolytic 100 uF 25 WVDC 10 50 Electra Capacitor Cera...

Page 195: ...I08 Capacitor Ceramic 1500 pF 100 WVDC 10 21735 Union Carbide Capacitor Ceramic 820 pF 300 WVDC 5 22156 Cornell Capacitor Electrolytic 470 uF 25 WVDC Electra Capacitor Electrolytic 220 uF 16 WVDC 10 5...

Page 196: ...ohms 2 1 4W R9 thru R1S Resistor Film 1K 2 1 4 1 R23 R28 RSS R62 R66 R68 R70 R72 R77 R78 R79 R8S R87 RI02 R144 R14S R16 thru Resistor Film 10K 2 1 4W R22 R24 R33 R36 R40 RS3 R57 RS8 R71 R86 R88 R89 R...

Page 197: ...or Film 470 ohms 2 1 4W 12161 471 RLR07C471GR RllO R37 R9S Resistor Film lOOK 2 1 4W 12161 104 RLR07CI04GR R96 Rll7 R122 Rl23 R125 Rl39 R140 R1S0 R151 R39 Resistor Trimmer 2K 16090 202 RJSOFP20 L R42...

Page 198: ...U7 U14 IG Operational Amplifier RCA U17 U8 IC IF Amplifier U9 IC Dual D Flip flop U10 IC Transistor Array RCA U11 U12 IC Quad Bilateral Switch RCA U18 IC FM Detector and Limiting Amplifier Motorola U1...

Page 199: ...Operational Amplfier RCA 36673 CA1458E U24 IC Quad Voltage Comparator 36693 L i339 U25 IC 4x4 Crosspoint Switch RCA 36802 CD22100EX U26 IC Audio Amplifier 2 Watt National 36777 Ui377N U27 IC Voltage R...

Page 200: ...Figure 6 13 ISB Assembly AS Optional 6 31...

Page 201: ...Figure 6 14 Component Location Diagram AS 6 32...

Page 202: ...2 156 T36lB156K020AS C53 Union Carbide Cll C32 C41 Capacitor Tantalum 6 8 uF 35 WVDC 25060 685 T362A685M035AS C38 C39 20 Union Carbide C41 C42 C43 C51 C16 C19 Capacitor Mica 1500 pF 500 WVDC 2 22174 C...

Page 203: ...R2 R18 Resistor Film 1 5K 2 1 4W 12161 152 RLR07C152GR R38 R3 Resistor Film 56K 2 1 4W 12161 563 RLR07C563GR I R4 R52 Resistor Film 12K 2 1 4W 12161 123 RLR07C123GR I R6 R65 esistor Film 3 3K 2 1 4W 1...

Page 204: ...C153GR R71 R49 Resistor Film 18K 2 1 4W 12161 183 RLR07C183GR R55 Resistor Film 33K 2 1 4W 12161 333 RLR07C333GR RS7 Resistor Film 6 8K 2 1 4W 12 161 682 RLR07C682GR R60 Resistor Film 33 ohms 2 1 4W 1...

Page 205: ...d Operational Amplifier RCA 36784 CA324E U4 IC Dual D Flip flop 36588 CD4013BE I U5 U9 IC Quad Bilateral Switch RCA 36792 CD4066BE I U6 IC Operational Amplifier 36541 UA757DMGB U7 U8 IC Quad Latch RCA...

Page 206: ...Figure 6 15 Microcomputer Assembly A6 6 37...

Page 207: ...RACAl Manufacturer Designation Number Mil Part No A6 Microcompueer Assembly 08397 A6Al Serial Asynchronous Ineerface Assembly 08391 see Table 6 9 for fureher breakdown A6A2 Microprocessor Asse bly 08...

Page 208: ...Figure 6 16 Asynchronous Interface Assembly A6Al 6 39...

Page 209: ...a r r mtJ w u u f f i s an F rn f 8 tin n f gf I f I ill e 5 iJ EJ O I to S w I I f I 3 tlI1 f F f li ff 9 ii Is N U 15 0 I I I I z Figure 6 17 Component Location Diagram A6A1 6 40...

Page 210: ...rt No M39014 01 1593 M39014 02 l356 25063 226 T362B226K01SAS 21733 C320C103MlUICl 25060 685 T362A685M035AS 22035 CMR05F301GODR 08491 Resistor Network 22K 8 Pin SIP 19321 223 SlP 8 223 Dale IC Quad Dif...

Page 211: ...n RACAL Manufacturer Designation Number MIL Part No Wl Cable Assembly 08493 WIJl Connector 26 Pin Male Part of Wl 61091 M83723 02R 1626M Connector 26 Pin Female Mates wi h J 1 61092 M83723 13R 1626 Yl...

Page 212: ...Figure 6 18 Microprocessor Assembly A6A2 6 43...

Page 213: ...f 3 3 0 N 3 0 I Ben 0 0 J I O II s I H J c tr I Figure 6 19 Component Location Diagram A6A2 6 44...

Page 214: ...0 WVDC t2 25059 T210A47sMOLOMS C17 Union Garbide Capacitor Tantalum 15 uF iO WVD 20 Union Carbide CRI Diode Zener s 6V dc CR2 CR4 Diode Silicon CRS CR6 CR3 Diode Germanium Jl Connector 34 Pin 3M J2 Co...

Page 215: ...1M 12161 104 RLR07C104GR I U1 IC Central Processor Unit Mostek 36710 MK3850 I U2 IC System Memory Interface Mostek 36712 MK3853 U3 IC Dual 1 0 4 Decoder 36671 74LS139 I U4 IC Octal 3 State Transceiver...

Page 216: ...Figure 6 20 First LO Synthesizer Assembly A7 6 47...

Page 217: ...Figure 6 21 Compo nent Locat on A7 Change 2 6 48...

Page 218: ...Capacitor Mica 100 pF 100 WVDC 5 Capacitor Mica 2i pF 100 WVDC 5 Capacitor Polyester O OOluF 400 WVDC 10 Stettner Trush 25061 336 25065 157 22001 22023 22119 26899 Capacitor polycarbonate 0 047 uF 10...

Page 219: ...r Q4 Transistor NPN Silicon Transistor PNP Silicon Motorola Transistor NPN Low Power Motorola Transistor NPN Low Power Silicon Resistor Film 47K 2 W Resistor Film 10 ohms 2 W Resistor Film 10K 2 W Res...

Page 220: ...esistor Film 120K 2 W ransformer Wideband C Quad 2 Input NOR Gate Motorola C Hex 3 State Buffer Motorola C 6 Bit D Flip Flop C Quad 2 Input NOR Gate TC Quad Exclusive NOR Gate Motorola C 8 B t Registe...

Page 221: ...Plip flop Fairchild 36774 1023lDC I U27 IC Divide by 10 11 Prescal er Fairchild 36745 llC90 r tJ29 IC Binary OP Down Counter 36772 M38510 31S06BEA U30 U31 IC Decode Up Down Counter 36773 M38S10 31S06B...

Page 222: ...Figure 6 22 Second LO BFO Synthesizer A8 6 51...

Page 223: ...c J C LI Figure 6 22 Component Location AS Change 2 54...

Page 224: ...Tantalum 3 3 uF 15 WVDC 20 Capacitor polycarbonate 0 1 uF 100 WVDC 10 Electra Capacitor Mica 150 pF 500 WVDC 2 Capacitor Mica 39 pF 500 WVDC 2 Capacitor Mica 68 pF 500 WVDC 2 Capacitor Ceramic 0 001 u...

Page 225: ...uR 20 Inductor Variable Transistor NPN Switching Pad Transistor Ql Q6 Ql0 Ql1 Qla Q19 Q20 Transistor NPN Low Power Motorola Transistor PNP Low Power Motorola Transistor Field Effect Transistor NPN Hi...

Page 226: ...R46 Resistor Film 56 ohms 2 JtW 12161 560 RLR07C560GR R52 Resistor Film 220 ohms 2 JtW 12161 221 RLR07C221GR RS3 Resistor Film 100 ohms 2 JtW 12161 101 RLR07Cl01GR R65 Resistor Film 18K 2 i w 12161 1...

Page 227: ...Figure 6 24 Receiver Control Assembly A9 6 59...

Page 228: ...0 r 1 1 II I I I L I I I J sI iL r li I J 1 I I I i 0 r Li 6 60 c S ctI o l c 1 c o 0 E o u...

Page 229: ...el Burndy 61240 Connector 26 Contact BFO Power 3M 61231 Connector 40 Contact IF 3M 61230 Connector 20 Contact Synthesizer 3M 61213 Connector 4 Contact 08573 Connector 34 Contact P O Wl 3M 61246 Transi...

Page 230: ...3 State Buffer Motorola U23 U24 U25 U42 U43 UI0 thru IC Display Drivers 7 Segment RCA U18 U31 thru U34 U19 thru IC Display Drivers 4 Line RCA U22 U36 thru U40 049 U26 IC Monstable Astable Multivibrat...

Page 231: ...Voltage Comparator IC Optical Transducer Optron U61 thru U64 IC 8 Bit Addressable Latch W 1 Cable Assembly Connector 34 Contact P O WI 3M Socket SIP 11 Contact Robinson Nugent Socket SIP 20 Contact R...

Page 232: ...Part No LCD LED Circuit Card Assembly 09501 051 058 LED Data Display Products 5P811211 Y 09806 I 0517 0532 059 D516 Not Used El E2 Terminal 70028 I 1U R4 Resistor Fixed Camp 180 ohm WVDC 10945 I R6 R...

Page 233: ...Figure 6 26 Power Supply Assembly AIO Top View 6 65...

Page 234: ...HIS 68i110 1 HId fll ______________ J J 1 f Ji Figure 6 27 Component Location Diagram A10 6 66...

Page 235: ...amp Slo Blo 125V Connector Power Input Filter and Fuse Components Corp Connector ac Switched Power Power Supply Connector Assembly Resistor Metal Film 33 ohms 2 1 4W Transformer Power IC Regulator 5...

Page 236: ...A08593 E2 Figure 6 28 Component Location Diagram AlOA2 6 68...

Page 237: ...tor Ceramic 0 01 uF 50 WVDC 20 21733 Erie B121 050 651 103M Capacitor Tantalum 6 B uF 35 WVDC 20 Union Carbide Capacitor Tantalum 1 uF 50 WVDC 20 Union Carbide Transistor Voltage Regulator Motorola Re...

Page 238: ...Asynchronous Interface A6Al Sheet 1 7 27 7 7 Schematic Diagram Serial Asynchronous Interface A6Al Sheet 2 7 29 7 8 Schematic Diagram Microcomputer A6A2 Sheet 1 7 31 7 8 Schematic Diagram Microcomputer...

Page 239: ...ONE OR GREATER ARE IN MICROHENRIES LESS THAN ONE ARE IN MILLIHENRIES 4 PARTIAL REFERENCE DESIGNATIONS ARE SHOWN FOR COMPLETE DESIGNATION PREFIX WITH UNIT AND OR ASSEMBLY DESIGN AI r I I I I I I I I R...

Page 240: ...15V 7 I Ho V V I I C36 IF OUT 40 4S5 104HZ TO A31 I LI6 56 RI4 1 220 I O J2 1 01 L 6 AGCINA I v _____ r5 81AS 1C37 I ol 1 I r _ _ _ J I 1 1 I UNLESS OTHERWISE NOTEOI t RESISTOR VALUES ARE N OHMS 1 4...

Page 241: ...ES i liM Ess OTHERWISE NOTED I RESISTOR VALUES ARE IN OHMS 1 4 WATT X I OOO M I OOO OOO 2 CAPACITOR VALUES ONE OR GREATER ARE IN PICOFARADS LESS THAN ONE ARE IN MICROFARADS 3 INDUCTANCE VALUES ONE OR...

Page 242: ...TE MODULE IS INSTALLED RloIIS USED ON I ASSEMBLY AND IS DELETED ON 2 ASSEMBLY AND REPLACED WITH BUSS VlRE AND SLEEVlNG CIQ4 IS 6a uF FOR 2 ASSEMBLY ONLY I C NO DEVICE GND 15V B 15V C 15V U7 324 II 4 U...

Page 243: ..._ _ __ RI44 RI43 IK I SK RI7 10K Ria r 15V A CR9 1tt 16 r ISV A 10K CRIO IN I6 CR3 IN916 f RII I I I I I 1 I I I _C23 IK TO I RI9 10K CR4 II IN916 15V A CRII 1N 6 C24 IO I R20 10K r ISV A CRI2 IN916...

Page 244: ...I r S I 6 C5 10K l 6 I R49 UIOd I 12 22K I I 0 1 I TP4 CRIS L J2 8 r 1 916 9V I I I CRIS I IN916 Ulld I DAC OUTPUT I TG rS 7_ t _t R SH4 I 9 4066 I LiNt 10K i50 9 C42 I R38 r6 8ut I _ 1 3V R27 I I 6 1...

Page 245: ...Sg 4 03 02 0ICK r 5 i Y SH3 S 1 _ I 1 1 1114 13 T 4 I I U2 2 a I CR2 9 I 1 cel 1458 I 8 1 3 IN91S ca3 1 IU2 4 14 00SH5 0 1 f r6 8ufl 9V 39 1 1 0 Jal13 158 ON 1 RIIT RII8 1I r 1 lOOK 39K RI2 S AGC I I...

Page 246: ...TPI7 Fd37 1 9 _ 7_K q I rul 1_ 1 f S 8L I 10 R57 10K I I I I c50 1 I R58 0 1 I 10K 06 I 2N5089 I R62 IK I TP7 R60 100 Q7 2NS089 R72 IK RF I I I I R82 I 47 R68 I I IK I R70 R75 I IK 470 I I r 4 C C SHA...

Page 247: ...I5 UI9 14_ _t IUZ8 7 FF I 10 I AM I RI08 I O l R3 1 iii I I 4053 S Su I RI26 RIZ7 51 RIZS UI9b f I r 1SH5 I 66K L I I 4 7K lB ZK l 2 2K 4053 I I 5 7 14 1 TPI3 SSB CW lAM AUDIO I RI24 L f_ C4 i18 8 J t...

Page 248: ...3 41 T I I I I I 47K TP5 I I I c B e 2 15 I I I I 2 cl CRI k TIR26 I l U2E04S I I C IOCI AI U9C I 5 3A RI4 IN9IS 324 14 ill I 0 6 324 7 1317 I2ZK I L IN91S 7 32 1 4066 I I I L 1 5 U5IA CII R20 Jl I I...

Page 249: ...t 1 1 r I ri FROM A4 R71 R77 ATTENUATED I K lOOK _ I ISB AUDIO I MAYBE USB 4 __ 1 1 T I OR LSB 42 16 But I XN_KII 9 1 t t t f I 5 N IPROOUCTDETECTOR ANDBFO AUOiOAMPUFiE R5 IFIAFI 1 I I I V I I I I I I...

Page 250: ...O H J K L IRESET M N 5V P UNREGl R S 12V T 12V U V l5V W 15V X 15V Y 15V Z 5V a b 5V e IOC0 110 READ lOCI IOC4 IOC2 IOC5 IOC3 IOC6 IOC7 IWSTB Figure 7 6 RACAL PROPRIETARY TABLE I FUNCTION SYSTEM GNO D...

Page 251: ...__ 2 II 14 3 011 3 ______ _ _ _1_ J I_ ENA ROMC4 IBI I J i rEN8 SFO TBR8 33 __ Q R _ 3 4 12 I I _ 11 I r h _A 40851 UI50 I I A 1 4 16 061 3_________ I I 1 I 13 3 r 2 15 05 I I U8B II 2 4011 i i i j e...

Page 252: ...NUMBER 02 4 T RECEivER NUMBER 02 9 U PARITY SELECT V EVEN COO F ARITY W SAUD RATE 84 rr x BAUO RATE 83 ry Y 3400 RATE 92 rx Z 3400 RATE 81 a GNO b GNO rw r v ru I I SYSTEM GNO I I I I I I I I I I I I...

Page 253: ...17 6 Z8 15 II 16 IZ Z7 17 51 _ N If IC J g g VGG REGOR VSS UZ 3853 SMI AII f I AIO f Z 7 ________ 19 l i 9 AIO 1 AIO A9 26 Z2 AIO I Z 2 A9 1 _ ZZAoj A9 Z5 Z3 A9 1 _2 1Z A8 1 1 Z l A8 A8 8 e j A8 __ 1...

Page 254: ...IR IG 14 B5 A5 13 BS AS 12 B7 74L U S 45 A7 II BB Aa 18 BI AI 17 B2 A2 B3 A3 I B4 A4 1 _1 _ l 1 PIC JI I 3 5 7 2 4 6 a Q C I Q 000 0 00 0 a a a 0 0 00 0 1 4 RACAL PROPRIETARY r RESET MEMORY RETEN rlON...

Page 255: ......

Page 256: ...Xl iUS I I Figure 7 9 RACAL PROPRIETARY A7 SOlEW TI HTHESIZER 1ST 1 0 HQQ 2 c 6 SHT Z OW c9ZS MT I G NO I tic Diagram i e Synthesizer Sheet 2 of 5 A7 Change 2 7 37 7 38...

Page 257: ...LOCK 220 I REFERENCE R37 CIRCUITRY szo I I I j CSO i 9Z0 6 9 1 I Rle I rfi6uI I j I I soo HV I I RI7 TPS I I Z ZK I I ECL 5 2 v I I REGULATION I L _________________ _J I I R7Z I 10 I 12 I A I MH z 6 S...

Page 258: ..._ 2163456 10 CKVCC C 15 r ENT TC P r 7 EN U 29 74 LSI 69 UO L OAD 9 R97 IK 1 5V 2163456 lil634S6 10 CK V ABC Q IS 10 CK V A seD ENT TC b Zq ENT EN U30 74LSI6e EN U3174L S16S UD L UD L OAD LOAD 9 9 TP...

Page 259: ...680 R94 10 C98 J3 3Uf I 12V R83 10K L 15 lOOG201 SI 14 __________ 1 OUT OF LOCK VOLTAGE CORRECTION SWITCH __ 1116 R68 IK R77 lOOK r CRI9 IN916 r _____ 1 OUT OF LOCK WINDOW DETECTOR 15V U34C 13 10 339...

Page 260: ...NT P O JS FROM INT EXT S2 SWITCH REAR PANEL NOTES UNLESS OTHERYJSE NOTED I RESISTOR VALUE ARE IN OHMS I WATT K I ooo M 1 000 000 2 CAPACITOR VALUES ONE OR GREATER ARE IN PICOFARADS LESS THAN ONE ARE I...

Page 261: ...LLATOR I ___ L OUT OF LOCK DETECTOR CIRCUIl_ L ____________________ __ _L T____ __ __ __ Ht 1 rTt 5V C21 0 1 TTL SHAPER BUFFERIAMPLIFIER CIRCUITRY r L l I I DIVIDE BY 20 ______ 1 C13 SH 3 500 Hz TO PH...

Page 262: ...Ir i 0 01 I J I I 711 4 74L50Z _ _ 0 01 r SHAPER AMPLIFIER CIRCUIT I 1 1 I I DIVIDE BY 50 d61 I 0 01 I ____ R74 IK I 1 I I L r J 0 0 1 l 6 R73 ZNZ369 I _ _ _Z_ z_K_I_ _O_ 1__ 3_ _3K_ 18 _ Tg_ _II__I 4...

Page 263: ...LIO I H I 1 12 4054 02 LII I 9I1 QI LI2 S4S3 S2S1 I 9 1 14 12 10 I 21 T 8FO U4 SRZ59 LIQUID CRYSTAL DISPLAY I II 01 I I 12 02 LOCK 1 t r 3 I3 5 4 03P SLOW 71 I 9 B 0 Be e B2 r tz I H I iP Ie e UIS B 2...

Page 264: ...PLAYS I IS I 3 f 4 cI CH I I 7 AI 01 11 is IZOHz I 514rNC 15 5 1 8 H ___J l Ii ITE g ltL I I HZ C IN r H 5_1 J5 I NC 5HI IS r 22 I II 07 I7 lo r t l I 43 b oi DATA 04 2 120kHZ 123 15 15 U47 I R 1 15 4...

Page 265: ...5 l83 05rLL 1 DATA BUFFERS AND L ______ 1 5 FRONT PANEL SWITCHES 5H 3 35 us Z2K U41 10K 1 5 I J3 I I 43Z5S78 I 3 EN Z 15 I 15 5 01 UZ3 I e4E IE 31 6i 6 1 tli 8E7Eg 14503 g 17 17 04 14 I ENb 12 13 13 I...

Page 266: ...R2 OS5 OS OS7 osa I 180 NOTES I I I 0 0 1 1 I RESISTOR VALUES ARE IN OHMS 5 1 2 WATT R5 DS9 DSI6 R5 l RB ARE NOT U E0 V IV t iJ t i J I 3 0 4 0 6 I l R8 VA i OS24 PI OS2O E2 EI 1 P Figure 7 12 Schema...

Page 267: ..._______ 1 I I I I 5V UNREG I E5 UI 78H05 RI 33 3 C3 I uI _____ ___ EI NOTES UZ 7815 E2 7915 3 UNLEss OTHERWISE NOTED I RESISTOR VALUES ARE IN OHMS 1 4 l lAn l 0 0 0 M l 000 000 Z CAPACITOR VA UES ONE...

Page 268: ...SS THAN ONE ARE IN MICROFARADS 3 INDUCTANCE VALUES ONE OR GREATER ARE IN MICROHENRIES LESS THAN ONE ARE IN MILLIHENRIES RTJAL REFERENCE OESIGNATIONS ARE SHOWN FOR COMPLETE DeSIG ATION PREFIX WITH UNIT...

Page 269: ...3 FAULT INDICATOR II NC 24 NC 12 NC 25 NC 13 NC i WI2 P2 42 MAIN IF OUT PG P I 7 O t_ MAIN IF OUT J4 r T i PI WIO 8FO OUT J f9T Et____ W II ______ 158 IF OUT 43 I A4JB PII A5WI I 158 AGC B 2 15B AGC A...

Page 270: ...eceiver is identical to that of the basic receiver with the following exception 8 9 AGC Level Return Refer to paragraph 1 15 in Attachment A 8 10 PARTS LIST 8 11 The information presented herein per t...

Page 271: ...omputer assembly A6 equipment modification USABLE OR CDDlRG LIS USABLE OR CODE A Greater than 2000 8 15 PARTS ORDERIRG When ordering replacement parts for the modified receiver specify the reference d...

Page 272: ...Foldout Refer to Figure 7 8 Sheet 1 for circuit details Figure 8 1 Microprocessot Circuit Card Assembly A6A2 Schematic Diagram Sheet 1 of 2 8 3 8 4...

Page 273: ...Foldout Refer to Figure 7 8 Sheet 2 for circuit details Figure 8 1 Microprocessor Circuit Card Assembly A6A2 Schematic Diagram Sheet 2 of 2 8 5 8 6...

Page 274: ...Diode Zener 5 6 V dc 33543 IN752A CR2 CM Diode Silicon 35514 IN916B CRS CR6 CR3 Diode Germanium 35538 IN270 J1 Connector 34 Pip 61200 J2 Connector 50 Pin 61224 Q1 Q4 Transistor PNP Low Power 32037 2N3...

Page 275: ...4 Decoder 36671 M38S10 30702BEE U4 IC Octal 3 State 36741 M38Sl0 31004BEi Transceiver US U6 ROM Set Firmware RAGMOl A09666 A 014 07 US IC Random Access Memory 36713 PS101L U9 IC 12 V Regulator TO 92 3...

Page 276: ...AorwrACHMENT A TECHNICAL MODIFICATION FOR AGe LEVEL RETURN TM 2...

Page 277: ...tion Equipment Modifications Circuit Changes Microcomputer Assembly A6 Receiver Deployment Installation Operation AGC Level Return Maintenance LIST OF APPENDICES Title Input Output Electrical Interfac...

Page 278: ...d receiver was modified to provide an AGC level return to all status returns during remote control operation Th is level is appended to the status return before a carriage return CR in the form Rx R s...

Page 279: ...are modification also provides the modified receiver with a low frequency reception extension to 50 kHz however with degradated response below 500 kHz 1 11 RECEIVER DEPLOYMENT 1 12 The following parag...

Page 280: ...APPENDIX A INPUT OUTPUT ELECTRICAL INTERFACE TM 2...

Page 281: ...232 compatible devices In addition the command receiver is interoperable with MIL STD 18SCor RS232 compatible devices The monitor transmitter meets the specifications of RS423 and MIL STD 188 114 It i...

Page 282: ...Receiver t 02 8 Parity Select Parity Even Odd Baud Rate B4 Baud Rate B3 Baud Rate B2 Buad Rate Bl Ground Ground System Ground 2 Data Input Output B Mark is positive 3 For unipolar ba1lanced RS 422 op...

Page 283: ...k Figure A 2 Baud Rate Selection A RS423 RS232 MIL STD 1SS 114 Unbalanced A6A1Jl B RS422 A6AlJl A B C D E F G H J A B C D E F G H J System Ground Data Out a Data Out Ground Data In at Data In Ground S...

Page 284: ...M 2 00 Start Bit ASCII Data Bit 0 ASCII Data Bit 1 ASCII Data Bit 2 ASCII Data Bit 3 ASCII Data Bit 4 ASCII Data Bit S ASCII Data Bit 6 Parity Bit or Stop Bit Stop Bit Figure A 4 Data Character Format...

Page 285: ...n involves the tuning wheel The tuning wheel is enabled to enter frequency whenever the tune select pushbutton has been depressed selecting FINE 1 Hz increments SLOW 30 Hz increments and FAST lOa Hz i...

Page 286: ...mined by the IF gain control is cut off while a signal above the MGC threshold is captured by AGC This is selected using the above switches in conjunction with the MGC button f Mariual Gain Control MG...

Page 287: ...ccomplished in case BITE results are unsatisfactory by simultaneously depressing LOCK and ISB but not during BITE The LCD display will indicate AUX Entry of symmetrical filters is accomplished using t...

Page 288: ...r numbers with commas Multiple addressing may not be used to set control modes or to specify a talker B Frequency F3 4l5926 The main tune Frequency is entered in MHz in up to eight digits with Leading...

Page 289: ...ts the bandwidth closest to the one requested bandwidth picked The monitor datashows the actual In override mode the conunand becomes 1 3 t where the riumJ er is the filter slot nunlber from one to se...

Page 290: ...s Command status may only be sent to one receiver since commands 5 and 6 create monitor data streams The status commands are 1 Set the receiver to local control 2 Set the receiver to remote control 3...

Page 291: ...er 6 20 kHz filter 7 Nothing Command 6 _ Report results of last bite Note that this is not cleared after having been read nor does it cause another Bite cycle To get a new Bite cycle with report start...

Page 292: ...d causes the AGC command dump to be disabled This would be used when free tuning the receiver by remote control 2 Monitor Status The following summary status is apPended to all other monitor data stre...

Page 293: ...at is the first local oscillator is always tuned to 40 455 MHz above the entered frequency The IF slot is always enabled regardless of the type of _filter installed It is up to the controller to decid...

Page 294: ...Sending either without the equals stores the data but leaves the receiver in the modal command mode L AGC Level Return R30 This number is appended to all Status returns and is in the range 0 Minimum S...

Page 295: ...ntains a etrical filter but there are SSB filters also in the system Filter slot one contains an upper sideband filter operation if installed will be impaired ISB No USB filter has been found in the s...

Page 296: ...m the IF center frequency 25 Filter in filter slot five is skewed from the IF center frequenC J I filter 26 Filter in slot six is skewed fr Om the IF center frequency 27 Filter in filter slot seven is...

Page 297: ...attempting to measure bandwidth of filter installed in filter slot five BITE frequency sweep underflowed while attempting to measure bandwidth of filter installed in f ilter slot six BITE frequency sw...

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Racal Instruments RA6790/GM, Instruction Manual

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