Harris 994-8730-008 Manual Download

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Summary of Contents for 994-8730-008

Page 1: ...y s dynamic program material A stereo audio peak limiter maintains Left Right L R and L R modulation levels within legal limits This built in limiter includes automatic 125 asymmetri cal switching to assure maximum modulation levels For station operations with external audio processing the en tire limiter may be bypassed PATENTED SEPARATION CORRECTOR Older AM transm itters and narrow band systems ...

Page 2: ...anda modern AM transmittermeas ured by a C QUAM modulation monitor Actual system performance wt I vary due to transmitterandantenna system performance SYSTEM FREQUENCY RESPONSE t 0 3 dB 50 Hz to 12 5 kHz under modulation conditions of L R L R 25 50 and 75 modulation also Lt R to 95 The response ofthe system is ltmited to the adjustment ofthe 1nternal le and r ght channel input filters wl lch may b...

Page 3: ...G Quam s t reo demodul ator l r to Time Required Approximately four hours for the conversion and exciter realignment A full proof of performance is req ir ed after the conversion Procedure Audio Input Board Part Number 992 6077 001 NOTE If the unit is cuf rently bei ng operated in conjunction with a mat rix ed L R t il aud io pro _ cessor t his part of th e ltOcfj fi atio a r Y done The modificati...

Page 4: ... and P5 These components will not be reinstalled Solder jumper from center post of J3 to the center post of J4 Be careful not to fill the plug of J4 The preferred method is to wrap t he jumper around the outside of the post and solder it Solder jumper from P5 46 edge connec tor feedthrough pad to Cll feedthrough pad Refer to Figure Band Figure 8 2B two sheets Insert jumper wire from pin 2 to pin 1...

Page 5: ... rate adjustment R44 set mid range 3 Check the setting of the carrier adjust control Rl4 located on the quadrature generator board This should be done by monitoring the depth of modulation of the IF carrier on an oscilloscope This signal can be viewed from the IF out BNC connector at the back of the exciter or the bottom of 12 on the quadrature board with a scope probe i Switch the stereo exciter ...

Page 6: ...se 5 to lOdB of gain reduction as before Select the pattern to be aligned day or night The exciter should still be in mono Turn the transmitter on and monitor the modulation level on a mono monitor or an oscilloscope Set the audi level control R54 day R55 night for 100 percent transmitter modulation Switch the exciter to stereo and switch the pilot OFF The pilot should be OFF for alignment and whe...

Page 7: ...nnel output of the stereo monitor Adjust the coarse delay rotary switch S1 or S2 for lowest distortion In the following order adjust the high frequency equalization R33 or R34 group delay R28 or R29 and the fine delay R8 or R9 potentiometers for a null in 10 KHz distortion Change the audio frequency back to 1 KHz and adjust the audio l evel control R54 or R55 for minimum distortion Change the audi...

Page 8: ...e separation with little effect on distortion To use the Separation Corrector move t he jumpers J5 and J6 on the Peak Limiter Separation Corrector card to the l ower position The 12 potentiometers at the lower front edge of the Peak Limit card will be adjusted to improve separation The front six potentiometers are used for the day pattern the back six potentiometers are for the night pattern The t...

Page 9: ...by moving the jumpers JS and_J6 on the Peak Limiter Separation Corrector card to their upper position 7 The audio response of the system is a result of alignment of the Audio Output card and the Separation Corrector if used The alignment of these controls adjusts the amplitude and delay of the main channel audio to match the RF information passing through the RF stages of the transmitter and anten...

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Page 12: ...www SteamPoweredRadio Com M 205 MJL Page 10 11 a q u 0 I co I co ...

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Page 14: ...www SteamPoweredRadio Com AM 205 MJL Page 12 0 a ca C w I co _ C 0 Cl I o C J 0 0 a ...

Page 15: ... R IN I Ol I MHz L R IN HMo Vt Aro I 4 D11 1V RS M ODUl ATOR I s U 1 1 r 1 ___ _ AMP Jt PILOT f rr E ttro I C 0 NjoFF IF IN BPF B J RO fl A J tON c F LTt R H D I IDtG l lTc 1 1 L1Ml1 A Ii IQ I 1 _ 0 I V W I ri r Auo a Ou IF Oll PM Our Tc Rf Ou pu r BoARO ...

Page 16: ...SE L R 95 L R 95 L R 75 L 75 R 75 L R 50 L 50 R 50 L R 25 L 25 R 25 CROSSTALK L R L R CROSSTALK L R L R 1PM CARRIER SHIFT PILOT FREQ INS OPERATING FREQUENCY INSTAtLATION PROOFS AUDIO FREQUENCY 50 100 200 400 1K 2K JK 5K 7 5K 10K 12 5K 15K r VVVIVVIZ lh VI 2 4k VIVV VIV IV 2 0 o w I t lo 0 i 0 0 0 0 0 0 0 0 1 1 OPTIONAL DIST E 1 SEP ...

Page 17: ...www SteamPoweredRadio Com STATION CALL________ FREQ ___________ DATE ____________ WRITER ______________ LOAD DUMMY ANT 0 TRANSMITTER MAKE MODEL ______ REMARKS______________ ...

Page 18: ...ESPONSE L R 95 L R 95 L R 75 L 75 R 75 L R 50 L 50 R 50 L R 25 L 25 R 25 CROSSTALK L R L R CROSSTALK L R L R 1PM CARRIER SHI FT PILOT FRECl INS OPERATING FREClUENCY INSTALLATION PROOFS AUDIO FREClUENCY 50 100 200 400 1K 2K JK 5K 7 5K 10K 12 5K 15K _ i v r 0 1 _ 0 1 l 3 t t r r _ i 4 _ 0 0 0 J 0 f _v 0 0 I I 0 0 0 0 r DIST SEP ...

Page 19: ...www SteamPoweredRadio Com STATION CALL________ FREQ ____________ DATE ____________ WRITER _______________ LOAD DUMMY ANT 0 TRANSMITTER MAKE MODEL ______ REMARKS_______________ f ...

Page 20: ... SteamPoweredRadio Com TECHNICAL MANUAL AM STEREO EXCITER 994 8730 002 994 8730 004 994 8730 006 JIHARRIS T M No 888 2174 005 Copyright HARRIS CORPORATION 1985 All Rights Reserved Printed J anuary 16 1985 ...

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Page 22: ... History Page Replaced the following pages Title Page and Manual Revision History Page 4 8 4 12 5 8 D 1 7 53 8 9 8 10 8 11 8 12 Replaced the following pages Title Page and Manual Revision History Page 7 1 7 2 7 64 7 65 7 66 7 67 8 2 i vi vii viii 8 31 8 32 with 8 31A 8 32 Added the following pages 7 68 7 69 7 70 8 31B 8 32 8 47 8 48 and 8 49 8 50 Replaced the following pages Title Page and Manual ...

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Page 24: ...al Fire Protection Association NFPA standards are recommended as references Automatic Fire Detectors No 72E Installation Maintenance and Use of Portable Fire Extinguishers No 10 Halogenated Fire Extinguishing Agent Systems No 12A WARNING ALWAYS DISCONNECT POWER BEFORE OPENING COVERS DOORS ENCLOSURES GATES PANELS OR SHIELDS ALWAYS USE GROUND ING STICKS AND SHORT OUT HIGH VOLTAGE POINTS BEFORE SERVI...

Page 25: ...D PULSE REMEMBER MOUTH TO MOUTH RESUSCITATION MUST BE COMMENCED AS SOON AS POSSIBLE IF PULSE ABSENT BEG IN ARTIFICIAL CIRCULATION CIRCULATION DEPRESS STERNUIJ 1 1 2 TO 2 INCHES APPROX RATE ONE RESCUER OF COMPRESSIONS 15 COMPRESSIONS 80 PER MINUTE 2 QUICK BREATHS APPROX RATE TWO RESCUERS OF COMPRESSIONS 5 COMPRESSIONS L 1 J ___ __ 60 PER MINUTE 1 BREATH NOTE DO NOT INTERRUPT RHYTHM OF COMPRESSIONS ...

Page 26: ... possible e If arms or legs are affected keep them elevated NOTE If medical help will not be available within an hour and the victim is conscious and not vomiting give him a weak solution of salt and soda 1 level teaspoonful of salt and 1 2 level teaspoonful of baking soda to each quart of water neither hot or cold Allow victim t o sip slowly about 4 ounces a half of glass over a period of 15 minu...

Page 27: ...tem Functional Description Audio Input Board Peak Limiter Separati on Corrector Board Peak L1miter Separation Corrector Quadrature Generator Board Audio Output Board RF Output Board Power Supply RF Amplifier Metering Board Modulation Meter Circuitry DC Circuitry Active Devi ce Functions Frequency Determining and Stabilizing Circuitry and Devices SECTION V MAINTENANCE Introduction Station Records M...

Page 28: ...ut Card Alignment SECTION VI TROUBLESHOOTING Introduction Technical Ass istance SECTION VII PARTS LIST Introduction Replaceable Parts Service SECTION VIII DIAGRAMS Introduction APPENDIX A STX lA INSTALLATION ADDENDUM Introduction Introduction Introduction APPENDIX D Introduction Modifications APPENDIX B TEST EQUIPMENT APPENDIX C SYNTHESIZER SETUP MODIFICATIONS FOR MATRIXED AUDIO PROCESSING 888 217...

Page 29: ...rols and Indicators Rear View of STX lA Controls and Indicators AC Metering DC Metering Replaceable Parts List Index STX lA AM STEREO EXCITER Basic Am Stereo Exciter Basic AM Stereo Exciter Metering Board Motherboard Audio Input Board Peak Limiter Separation Corrector Peak Limiter Separation Corrector Quadrature Board Audio Output Board RF Output Board VCO Board Power Supply Board 992 6086 001 STX...

Page 30: ... Waveforms at Bottom of L2 for Pinchoff Adjustment 5 10 5 2 Correct and Incorrect Waveforms at Bottom of L2 for R14 Adjustment 5 10 5 3 Correct and Incorrect Displays at U29 Pin 1 5 11 8 1 8 2A Schematic Audio Input PC Board 8 3 Schematic Quadrature Generator PC Board 992 6078 003 Sheet 1 of 2 8 5 8 2A Schematic Quadrature Generator PC Boar d 992 6078 003 Sheet 2 of 2 8 7 8 2B Schematic Quadrature...

Page 31: ...reo Exciter Peak Limiter Separation Corrector Sheet 2 of 2 992 6202 002 8 39 AM Stereo Exciter Peak Limiter Separation Corrector Sheet 1 of 2 992 6202 001 8 41 AM Stereo Exciter Peak Limiter Separation Corrector Sheet 2 of 2 992 6202 001 8 43 Schematic VCO 8 45 STX lA Frequency Determinant Chart Sheet 1 of 2 8 47 STX lA Frequency Determinant Chart Sheet 2 of 2 8 49 A 1 Isolation Schematic 829 9345...

Page 32: ...er on a daily basis d SECTION IV PRINCIPLES OF OPERATION provides detailed theory of operation of the various sections of the exciter e SECTION V MAINTENANCE provides preventive and corrective main tenance as well as tuning procedures alignment procedures f SECTION VI TROUBLESHOOTING provides troubleshooting procedures and guidelines g SECTION VII PARTS LIST provides information on the replaceable...

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Page 34: ...d not be returned unless written approval and a Return Authorization is received from HARRIS CORPORATION Broadcast Group Special shipping instructions and coding will be pro vided to assure proper handling Complete details regarding circumstances and reasons for return are to be included in the request for return Custom equipment or special order equipment is not returnable In those instances wher...

Page 35: ...g the drive chain between stages to introduce the external RF drive or converting the oscil lator device to a buffer stage to accept external RF from the AM stereo exciter 2 13 Converting the AM transmitter to stereo operation is similar to the process required in the 1950s and 1960s to convert black and white tele vision transmitter for color careful adjustment of the transmitter and addition of ...

Page 36: ...xciter include a Differential delay adjustment to compensate for time delay varia tions between RF driver and modulator chains b Group delay variation adjustment to compensate for nonuniform modulator group delay as a function of frequency c Amplitude equalizers to compensate for low frequency and high frequency response irregularities d AC coupling adaptor to remove DC component from the audio si...

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Page 38: ...www SteamPoweredRadio Com Figure 3 4 VCPM Generator AS Controls and Indi ators 3 12 888 2174 001 WARNING Disconnect primary power prior to servicing ...

Page 39: ...tween RF sent to transmitter and feedback Indicates the polarity of the voltage monitored by the multimeter Illumi nated when negative Selects peak or average responding circuitry for the modulation meter Provides access to the signals moni tored on the modulation meter Adjusts the RF level exciter out of the Illuminates when in the day mode of operation Illuminates when in the night mode of opera...

Page 40: ...nnel of peak limiter is bypassed L R IN OUT JUMPERS J2 up J4 down L R channel of peak A4J2 A4J4 limiter is enabled J2 down J4 up L R channel of peak limiter is bypassed L R ASYMMETRY CONTROL Controls the L R VCA asymmetry A4R5 L R GAIN CONTROL A4R41 NEGATIVE MODULATION Limit Control A4R211 SEPARATION CORRECTOR JUMPER L R A4J5 SEPARATION CORRECTOR JUMPER L R A4J6 Sets the peak limiter gain in the L...

Page 41: ...www SteamPoweredRadio Com Figure 3 2 Audio Input A3 Controls and Indicatc s 3 6 888 2174 001 WARNING Disconnect primary power prior to servicing ...

Page 42: ...www SteamPoweredRadio Com Figure 3 3 Separation Corrector Peak Limiter A4 Controls iiid Indicators 3 8 888 2174 001 WARNING Disconnect primary power prior to servicing ...

Page 43: ...www SteamPoweredRadio Com Figure 3 3 Separation Corrector Peak Limiter A4 Controls iu1d Indicators 3 8 888 2174 001 WARNING Disconnect primary power prior to servicing ...

Page 44: ...www SteamPoweredRadio Com Figure 3 2 Audio Input A3 Controls and Indicato s 3 6 888 2174 001 WARNING Disconnect primary power prior to servicing ...

Page 45: ...bled J2 down J4 up L R channel of peak limiter is bypassed J2 up J4 down L R channel of peak limiter is enabled J2 down J4 up L R channel of peak limiter is bypassed L R ASYMMETRY CONTROL Controls the L R VGA asymmetry A4R5 L R GAIN CONTROL A4R41 NEGATIVE MODULATION Limit Control A4R211 SEPARATION CORRECTOR JUMPER L R A4J5 SEPARATION CORRECTOR JUMPER L R A4J6 Sets the peak limiter gain in the L R ...

Page 46: ...een RF sent to transmitter and feedback Indicates the polarity of the voltage monitored by the multimeter Illumi nated when negative Selects peak or average responding circuitry for the modulation meter Provides access to the signals moni tored on the modulation meter Adjusts the RF level exciter out of the Illuminates when in the day mode of operation Illuminates when in the night mode of operati...

Page 47: ...www SteamPoweredRadio Com Figure 3 4 VCPM Generator AS Controls and Indi ators 3 12 888 2174 001 WARNING Di5connect primary power prior to servicing ...

Page 48: ... maximum distortion allowed angle mode amount of envelope in the variable Adjusts the I channel carrier level Controls the amount of drive to the VCA in the L R channel Adjusts the gain in the Q channel Adjusts the peak limiter modulation limit to control envelope distortion Nulls the distortion output of a dif ference amplifier when L R O Sets the envelope distortion limit controlled by limiting ...

Page 49: ...is routed through the separation corrector board Both up VGA output bypassed the separation corrector Up position peak limiter Down position the audio input L R 1lllio comes from the L R audio comes from board Used to minimize pilot distortion Tunes the input of the hard limiter to the IF frequency Adjusts the pilot injection level Adjusts the pilot frequency in the full quadrature mode Nulls the ...

Page 50: ...www SteamPoweredRadio Com THIS PAGE INTENTIONALLY LEFT BLANK 888 2174 001 3 15 WARNING Disconnect primary power prior to servicing ...

Page 51: ...www SteamPoweredRadio Com CD 0 LOCATED BEHIND HEAT SINK Figure 3 5 Meter Board Al Controls and IndicQtors 3 16 888 2174 001 WARNING Disconnect primary power prior to servicing _ ...

Page 52: ...IBRATE Sets the average reading equal to the AlR38 peak 2 METER CALIBRATE Calibrates the meter sensitivity A1R34 3 GAIN BALANCE Balances the gain for the positive and A1Rl6 negative peaks 4 METER ZERO Sets the meter to zero with no signal A1R6 applied 888 2174 001 3 17 WARNING Disconnect primary power prior to servicing ...

Page 53: ...www SteamPoweredRadio Com 3 18 Figure 3 6 Power Supply RF A p Controls and Indi ators 888 2174 001 WARNING Disconnect primary power prior to servicing 2 ...

Page 54: ...ut to the amplifier output or to the amplifier input Connects an internal 51 load across the output of the RF amplifier Controls the RF level reading on the multimeter and the level required to illuminate the READY LED Indicates that the 19 volt regulator is operational Illuminates to indicated the 19 volt regulator is operational Illuminates to indicate the 15 volt regulator is operational Illumi...

Page 55: ...www SteamPoweredRadio Com Figure 3 7 Audio Output Card A6 Controls di cator s 3 20 888 2174 001 WARNING Disconnect primary power prior to servicing ...

Page 56: ... time delay in the day mode Adjusts the audio delay in 4 4 s increments in the day mode Adjusts the audio delay in 4 4 s increments in the night mode Provides a continuously variable time delay in the night mode Compensates for transmitter audio high frequency rolloff in the night mode Compensates for transmitter audio low frequency rolloff in the night mode Adjusts the audio level for correct rec...

Page 57: ...FUNCTION 14 CROSSOVER DAY Sets the high frequency crossover point A6R30 in the day mode 15 15V LED Illuminates to indicate that the 15V A6DS1 regulator is operational 16 15V LED Illuminates to indicate that the 15V A6DS2 regulator is operational 3 22 888 2174 001 WARNING Disconnect primary power prior to servicing ...

Page 58: ...www SteamPoweredRadio Com THIS PAGE INTENTIONALLY LEFT BLANK 888 2174 001 3 23 WARNING Disconnect primary power prior to servicing ...

Page 59: ...www SteamPoweredRadio Com I l l Figure 3 8A RF Output Board A7 992 6079 002 Controls and Indicators 3 24 888 2174 001 WARNING Disconnect primary power prior to servicing ...

Page 60: ...s the crystal to BT MHZ Selects the correct capacitor value for the desired channel frequency Trims the peak filter to the carrier frequency Trims the notch filter to the correct frequency Selects capacitors to tune the notch filter to an undesired frequency Sets IF level into the imageless mixer IMAGE NULL CAPACITOR Nulls the image frequency out of the mixer INJECTION NULL CONTROLS IMAGE NULL CON...

Page 61: ...www SteamPoweredRadio Com Figure 3 8B RF Output Board A7 992 6079 003 Controls and Indicators 3 26 888 2174 001 WARNING D isconnect primary power prior to servicing ...

Page 62: ... A7S2 the desired channel frequency JUMPER Jl NOTCH FILTER CAPACITOR SELECT SWITCH A7Sl NOTCH FILTER TRIM CAPACITOR C70 IMAGE NULL CONTROL A7R121 INJECTION NULL CONTROLS A7R110 A7Rll6 Selects capacitors to tune the notch fil ter to an undesired frequency Trims the notch filter to the cor rect frequency Nulls the image frequency out of the mixer Nulls the injection frequency out of mixer IMAGE NULL...

Page 63: ...www SteamPoweredRadio Com Figure 3 9 Interior of STX lA Controls and Indicators 3 28 888 2174 001 WARNING Disconnect primary power prior to servicing ...

Page 64: ...ble 3 9 Interior of STX lA Controls and Indicators REF CONTROL INDICATOR FUNCTION 1 POWER ON OFF SWITCH Controls primary power to the exciter A9S1 power supply 888 2174 001 3 29 WARNING Disconnect primary power prior to servicing ...

Page 65: ...c J c J _ I R MOTE 8 I M f CA l OIIS 7 t I _ i i 3 I i i I t i 8 ii 0 l 0 if fO 9 T 7 f i iill Jt ulfi l iR llift III Figure 3 10 Rear View of STX lA Controls and Indicators 3 30 888 2174 001 WARNING Disconnect primary power prior to servicing ...

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Page 67: ...0 E t o 0 J t o CX CX CX I N J i I 0 0 p l w p I p CRYSTAL OSCILLATOR MONO Cos wet Sin wet o STEREO V t HARD LIMITER Ve t RF IN TRANSMITTER AF IN Ve t ENVELOPE DETECTOR Figure 4 1 Conversion of a Standard AM Transmitter to a Quadrature AM QAM Transmitter ...

Page 68: ...put Vc t is a constant amplitude radio frequency RF signal which can be recovered from V t by using a limiter Vc t is applied to the transmitter s RF amplifier chain in place of the signal from the transmit ter s carrier frequency oscillator The transmitter s AF and RF amplifiers amplify Ve t and Vc t separately and multiply them together in the modulated stage to recreate the complete quadrature ...

Page 69: ... L R and to accordingly reduce single channel modulation so that this difference is acceptable This single channel modulation limit is only to control negative peaks of modulation because it is only on these negative peaks that there may be a difference 4 6 FUNCTIONAL DESCRIPTION 4 7 Land Rare applied to a matrix which generates L R and L R L R is highpass filtered to reserve pilot spectrum below ...

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Page 71: ...stereo signal AUDIO Compensated audio sent to the trans mitter PM CORRECTOR Amount of phase correction being done by the PM feedback board Table 3 12 DC METERING MULTIMETER SWITCH SIGNAL DISPLAYED POSITION RF VOLTS RMS Volts out into a 50 ohm load G Always reads 2 5 volts 19 VOLTS Preregulated 19 volts bus 19 VOLTS Preregulated 19 volts bus EXTERNAL Not used AC line voltage AC LINE LIM GR Peak lim...

Page 72: ... are provided at terminal board TB2 on the rear of the STX IA for remotely switching the exciter between day and night oper ation and between stereo and mono modes The control ports are optically isolated from the internal circuitry of the exciter Remote switching can be accomplished with the 19V supplied at terminal strip TB2 15 or with an external supply To activate the remote switching function...

Page 73: ...e 3 10 Rear View of STX lA Controls and Indicators REF CONTROL INDICATOR FUNCTION 1 FUSE Fl 4 amp fuse to protect from an over current condition within the STX lA 888 2174 001 3 31 WARNING Disconnect primary power prior to servicing ...

Page 74: ... 15V REG 1 15V REG INPUT 10 0 I NPUT LEVEL SELECTOR 15V TEST POINT 15V TEST PO INT BANDPASS FILTER BANDPASS 15V SOURCE 15V SOURCE FILTER 15V INDICATOR 15V INDICATOR 7 5V ZENER 7 SV ZENER L R M A T R X L R 7 5V TEST OINT 7 SV TEST POINT APF MATCH MONO STEREO SWITCH FROM QUADRATURE BOARD 7 5V SOURCE L R OUT L R HPF ou r AMP MATCH FIGURE 4 2 BLOCK DIAGRAM AUDIO INPUT 839 6202 040 4 5 4 6 ...

Page 75: ...pass filtering consists of a two pole Chebychev 0 1 dB ripple filter with a cutoff of 45 Hertz At 45 Hz the cutoff is low enough so as not to affect the response of any AM radios and high enough that it is above the cutoff of any AM transmitter 4 18 Lowpass filtering consists of a four pole Chebychev 0 1 dB ripple filter with adjustable cutoff frequency As supplied by the factory the filter has a ...

Page 76: ...to the MONO mode 4 24 PEAK LIMITER SEPARATION CORRECTOR BOARD 4 25 PEAK LIMITER Refer to figures 4 3 and 8 9 for the following discus sion The peak limiter holds the following modulation constraints on matrixed audio applied to its input L R L R L ONLY R ONLY 100 100 80 80 130 80 50 80 50 4 26 A clip limit architecture with program dependent multiple release rates allows maximum modulation density...

Page 77: ...PARATORS L R loG 1 19V IN 19V IN l Y 8V 4 p so u i C E 1r avl T E i_T___ av i m av av 1 _____ 1 p SO U i C E __ T_E i_T___soJJcE LEFT CHANNEL SEPARATION ADJUSTER SEPARATION CORRECTOR PHASE SHIFTER CORRECTED I GAIN 1 1 1 ADJUST GAIN ADJUST RIGHT CHAJ EL O AL AR SEPARATION i ADJUSTER PHASE SHIFTER 90 CORRECTED 0 0 FIGURE 4 3 BLOCK DIAGRAM PK LIM SEP CORR 839 6202 039 4 9 4 10 ...

Page 78: ...ogether to produce a common limiter control signal Whenever any modulation constraint is exceeded the limiter control line goes low to initiate limiting action 4 34 Limiting control switch S2 breaks the limiting control line to dis able the limiter attack and release circuitry when only clipping is desired 4 35 When S2 is closed PNP transistor Q4 will turn on whenever the limit ing control line go...

Page 79: ...ier Ul7 7 allpass filter Ul6 14 and summing amplifier Ul 7 1 Likewise 015 8 U15 7 Rl34 and Rl35 add controlled amounts of frequency independent left channel information to the L R channel through summing amplifier Ul7 7 allpass filter Ul6 14 and summing amplifier Ul7 l Frequency dependent RIGHT channel information is derived by Ul6 l Rl43 Rl44 Rl45 Rl46 and applied to the L R channel through allpa...

Page 80: ... 1l 1s d l 19 IS f ON OFF 7 5 7 S 4 IF IN MODULATOR I IF OUT 3RD BUFFER 100 KHZ HARMONIC OFFSET DEMODULATOR BWLPF FILTER HARO LIMITER OEGLITCHER DEMODULATOR DRIVER TO RF OUT OR DISTORTION MODULATION CONTROL ANALYZER SWITCH 15 STEREO FP j u r STEREO REMOTE f _O_P T0 7 ISO MONO REMOTE IS AC COUPLER STEREO MONO OUT RMS oc COMPARATOR AF OUT TO PEAK LIMITER L R MOO LIMITS FIGURE 4 4 BLOCK DIAGRAM QUADR...

Page 81: ...pass unaffected while filling in holes or oscillations with IF carrier Regardless of the input signal from Ul5 12 the outputs from Ul6 6 and UlS 7 will be 256 kHz phase modulated IF carrier Thus the deglitcher ensures that if the IF signal is pinched off or if any of the preceding circuits fail that there will still be an RF signal applied to the transmitter 4 48 Ull buffers the IF signal and driv...

Page 82: ...elected by swi hes _52_ and S2 which determine how many 4 4 micro second sections are i he ngna path Using the 4 4 microsecond steps provided by switches Sl and S2 and the continuously variable delay control led by R8 and R9 any delay time up to the maximum may be selected 4 57 The delay line has a constant time delay characteristic versus fre quency But some transmitters may have a nonuniform tim...

Page 83: ...j DAY NIGHT DAY C r i T t t L REMOTE OPTO NIGHT ISOLATOR CMOS REMOTE N PANEL ii u J J 1 SWITCH L _______ I DAY NIGHT OUT 15V SOURCE 15V TEST 15 7 5V SOURCE SWITCH I I L_ DAY NIGHT SWITCH DAY NIGHT SWITCH 15V f 7 5v 1 Hs5T 15V TEST 15V SOURCE 7 5V SOURCE r l_ _p DAY NIGHT SWITCH TO AC METER 6 ADS HIGH AND LOW FREQURNCY AMPLITUDE COMPENSATION I I l_ p p _ p HT FIGURE 4 5 BLOCK DIAGRAM AUDIO INPUT 83...

Page 84: ...der filter follows the delay line for suppression of harmonics of the I F A bandpass filter and amplifiers U7 and U6 further filters and amplifies the phase modulated signal before up conversion 4 66 U6 drives an imageless mixer using 010 and 011 The mixer uses 0 degree and 90 degree phases of IF and LO injection to cancel the unwanted sideband which in this case is the upper sideband 4 67 The LO ...

Page 85: ... METER CIRCUITRY 4 76 The signal selected by Sl is applied to a precision full wave recti fier circuit consisting of U2 CRl CR2 U3 and associated components As CRl and CR2 are enclosed in the U2 feedback loop the forward turn on voltage characteristic of each diode is compensated The positive going half cycles appear across Rll and the negative going half cycles appear across Rl2 with no diode thr...

Page 86: ... SWITCH I I kTE i oPfo NIGHT ISOLATOR REMOTE NIGHT FRONT PANEL SWITCH DAY NIGHT OUT DAY NIGHT _ 7r t f iL I L 15V SOURCE 15V TEST 15 CMOS 7 5V SOURCE I I SWITCH I I I I L OAY NIGHT SWITCH DAY N GHT SWITCH 1 15V l 4 7 5v l 1 rls5T 15V TEST 15V SOURCE 7 5V SOURCE TO AC METER 8 AOS HIGH ANO LOW FREQURNCY AMPLITUDE COMPENSATION FIGURE 4 5 BLOCK DIAGRAM AUDIO INPUT 839 6202 042 4 17 4 18 ...

Page 87: ... function as they pertain to the HARRIS STX lA AM STEREO EXCITER a XR2206 Oscillator pilot generator b MC1496 Balanced Modulator Up converts the IF frequency to the transmitter frequency c MC145151 Parallel input phase locked loop synthesizer Generates the correct quency to up convert the IF to RF PLL frequency oscillator fre d AD536 Determines rms distortion of envelope detected audio RMS to DC c...

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Page 89: ...OGBOOK 5 6 The maintenance logbook should contain a complete description of all maintenance activities required to keep the equipment in operational status A listing of maintenance information to be recorded and analyzed to provide a data base for a failure reporting system is as follows DISCREPANCY CORRECTIVE ACTION DEFECTIVE PART S SYSTEM ELAPSED TIME NAME OF REPAIRMAN STATION ENGINEER Describe ...

Page 90: ...means the need for lubrication the lack of proper ventilation or the existence of some defect can be detected and corrected before serious trouble occurs Become familiar with operating tempera tures in order to recognize deviations from the normal range c TIGHTEN Tighten loose screws bolts and nuts Do not tighten indiscriminately as fittings that are tightened beyond the pres sure for which they a...

Page 91: ...he integrated circuits and surrounding area for dirt as accumulations of dirt or dust could form leakage paths b Use compressed dry air to remove dust from the area WARNING I ALWAYS WEAR SAFETY GOGGLES WHEN USING COMPRESSED AIR 5 13 CAPACITORS Preventive maintenance of capacitors is accomplished by performing the following steps a Examine all capacitor terminals for loose connections or corrosion ...

Page 92: ...and control knob setscrews do not disturb knob alignment h If necessary clean component with a dry brush or a lint free cloth c When dirt is difficult to remove clean component with a lint free cloth moistened with an approved cleaning solvent 5 16 FUSES Preventive maintenance is accomplished by performing the __ following steps WARNING I ALWAYS REMOVE ALL POWER AND BEFORE TOUCHING ANY OF THE COMP...

Page 93: ...nuts and condi tion of rubber grommets b Remove indicator switch by pulling the plastic cover indicator assembly from the case and rotating the assembly 90 degrees c Inspect indicator assemblies for broken or cracked covers loose envelopes loose mounting screws and loose or dirty connections d Tighten loose mounting screws Solder loose connections If connections are dirty or corroded clean with cr...

Page 94: ... the modulation monitor and adjust these two potentiometers for a maximum 5 23 PEAK LIMITER CARD ALIGNMENT A4 5 24 The Peak Limiter alignment will be accomplished with the card A4 extended on the extender card provided with the STX IA a Set jumper J2 to its upper position and J4 to its lower position Set Jl to its upper position and J3 to its lower posi tion Set jumpers JS and J6 to their upper po...

Page 95: ...t aligned correctly the Quadrature alignment will not be correct These cards should be aligned first if necessary R211 on card A4 should be turned fully counterclockwise ccw a Apply 400 Hz audio at about lOdBm to the LEFT audio input termi nals at the back of the STX lA Switch the STX lA to MONO Monitor the bottom of L2 with an oscilloscope and adjust Rl4 to get a waveform like the one in Figure 5...

Page 96: ...form The negative peaks will be affected the most with this adjustment Figure 5 3 shows correct and incorrect displays Reset audio generator to 1 kHz Readjust Rl4 for 100 modulation display on the oscilloscope The modulation meter should read 100 and the display at the bottom of L2 shoul d show 100 e Measure the de voltage at U7 2 with an accurate de voltmeter Adjust Rl03 for 2 50 Vdc Adjust R22 s...

Page 97: ... indication of 4 096 MHz b Set the synthesizer dip switches to the desired positions ac cording to the chart in Addendum C Check the output at Jl to see that a signal of the desired frequency is present If it is not adjust Rl through the hole in the VCO cover until the syn thesizer locks to the correct frequency NOTE Cl on the VCO board A6Al should be removed for output frequencies above 900 kHz c...

Page 98: ...igure 5 1 Correct and Incorrect Waveforms at Bottom of 12 for Pinchoff Adjustment CORRECT INCORRECT Figure 5 2 Correct and Incorrect Waveforms at Bottom of L2 for Rl4 Adjustment 5 10 888 2174 001 WARNING Disconnect primary power prior to servicing ...

Page 99: ...www SteamPoweredRadio Com CORRECT INCORRECT Figure 5 3 Correct and Incorrect Displays at U29 pin 1 888 2174 001 5 11 5 12 WARNING Di conneot primary power prior to aervicing ...

Page 100: ...www SteamPoweredRadio Com ...

Page 101: ...ting procedure check all switches power cord connections connecting cables and power fuses 6 4 TECHNICAL ASSISTANCE 6 5 HARRIS Technical and Troubleshooting assistance is available from HARRIS Field Service during normal business hours 8 00 a m 5 00 p m Central Standard Time Emergency service is available 24 hours a day Telephone 217 222 8200 to contact the Field Service Department or address corr...

Page 102: ...www SteamPoweredRadio Com ...

Page 103: ...le 24 hours a day seven days a week from the HARRIS Service Parts Department Telephone 217 222 8200 to contact the service parts department or address correspondence to Service Parts Department HARRIS CORPORATION Broadcast Transmission Division P O Box 4290 Quincy Illinois 62305 4290 USA The HARRIS factory may also be contacted through a TWX facility 910 246 3312 or a TELEX service 40 4347 888 217...

Page 104: ...AM STEREO EXCITER 992 6088 002 7 44 7 5 METERING BOARD 992 6085 002 7 6 7 6 MOTHERBOARD 992 6084 001 7 9 7 7 AUDIO INPUT BOARD 992 6077 001 7 10 7 18 PEAK LIMITER SEPERATION CORRECTOR 992 6101 003 7 46 7 19 QUADRATURE BOARD 992 6078 004 7 52 7 11 AUDIO OUTPUT BOARD 992 6080 001 7 30 7 20 RF OUTPUT BOARD 992 6079 003 7 58 7 13 VCO BOARD 992 6119 001 7 39 7 14 POWER SUPPLY BOARD 992 6086 001 7 40 7 ...

Page 105: ...eredRadio Com Table 7 2 STX lA AM STEREO EXCITER 994 8730 002 REF SYMBOL HARRIS PART NO DESCRIPTION 994 8730 001 BASIC AM STEREO EXCITER QTY UM 1 888 2174 001 7 3 WARNING Disconnect primary power prior to servicing ...

Page 106: ...0274 000 843 4035 002 888 2174 001 992 6088 001 992 6116 001 992 6267 001 DESCRIPTION CB BX 24 75 X21 X17 POWER CORD 7 1 2 FT FAMILY TREE TM STX lA AM STEREO BASIC AM STEREO EXCITER CARD EXTENDER PACKING CHECK LIST STX lA 7 4 888 2174 001 WARNING Disconnect primary power prior to servicing QTY 1 1 0 1 0 1 1 0 1 0 UM ...

Page 107: ... SLOW CART 4A 125V 1 0 A9R001 548 2008 000 RES 27 4K OHM 1 4W 1 1 0 A9R002 548 1407 000 RES 51 lK OHM l 4W 1 1 0 A9R003 548 0315 000 RES 182K OHM 1 4W 1 1 0 A9R004 548 0325 000 RES 243K OHM l 4W 1 1 0 A9TS001 614 0155 000 TERM STRIP 8 1 8 GND 1 0 A9T001 472 1303 000 XFMR POWER 1 0 402 0020 000 FUSE CLIP 2 IIA9C001 flA9C002 402 0175 000 CLIP 1 3 8 DIA COMPONEN 2 464 0169 000 TOOL TRIMMER ADJUSTMENT...

Page 108: ... 2 7UF 35V 10 1 0 C023 C024 526 0049 000 CAP 6 8UF 35V 20 2 0 DS001 DS002 384 0611 000 LED RED DS003 DS004 DS005 DS006 DS007 7 0 J017 610 0854 000 HEADER 40 PIN PC RIBBON 1 0 J018 620 1677 000 RECEPTACLE PANEL BNC 1 0 Q001 Q002 380 0319 000 TRANSISTOR MPS Al4 2 0 Q003 380 0190 000 TRANSISTOR 2N3906 1 0 R001 540 0944 000 RES 22 0K OHM 1 4W 5 1 0 R002 540 0978 000 RES 560 0K OHM 1 4W 5 1 0 R003 540 ...

Page 109: ...ES 820 0 OHM 1 2W 5 1 0 R047 R048 548 0997 000 RES 20K OHM 1 4W 1 2 0 R049 548 0932 000 RES 100K OHM 1 4W 1 1 0 R050 R051 000 0000 002 APPEARS ON HIGHER LEVEL 2 0 R052 548 1364 000 RES 16 2K OHM 1 4W 1 0 R053 548 0816 000 RES 10 5K OHM l 4W 1 1 0 R054 548 1440 000 RES 25 5K OHM 1 4W 1 1 0 R055 R056 548 0607 000 RES 7500 OHM l 4W 1 2 0 R057 548 1440 000 RES 25 5K OHM l 4W 1 1 0 R058 548 1365 000 RE...

Page 110: ...00 382 0472 000 382 0359 000 382 0360 000 382 0552 000 358 2177 000 404 0674 000 404 0673 000 404 0674 000 DESCRIPTION RES 100 0K OHM 1 4W 5 RES 300 0K OHM 1 4W 5 RES 10 0K OHM 1 4W 5 POT 2K OHM 1 2W 10 RES 51 0K OHM 1 4W 5 RES 22 0K OHM 1 4W 5 SW ROTARY 1 POLE 12 POS SWITCH SPDT TOGGLE SWITCH SPDT MOM OFF IC TL074CN3 IC LM318 IC 7815 IC 7915 IC TL074CN3 SPACER LED MOUNT 380 LG SOCKET IC 14 CONT S...

Page 111: ...000 RES 510 0 OHM l 2W 5 1 0 R018 540 1225 000 RES 82 0 OHM l 2W 5 1 0 R019 R020 540 1112 000 RES 510 0 OHM l 2W 5 2 0 R022 540 1170 000 RES 430 0 OHM 1 2W 5 1 0 R23 R24 542 0012 000 RES 40 OHM 5W 2 0 R025 540 1116 000 RES l OK OHM l 2W 5 1 0 R026 540 0943 000 RES 20 0K OHM l 4W 5 1 0 R027 540 1165 000 RES 3 3K OHM l 2W 5 1 0 R028 540 0933 000 RES 7 5K OHM l 4W 5 1 0 R029 540 1165 000 RES 3 3K OHM...

Page 112: ...033 C034 C037 516 0453 000 CAP lUF 100V 20 C038 C039 C040 C041 C042 C043 C044 C045 C046 12 0 DS1 DS2 384 0661 000 L E D GREEN 2 0 P001 P002 610 0679 000 PLUG SHORTING 2 0 Rl R2 540 0985 000 RES l lM OHM l 4W 5 2 0 R003 540 1356 000 RES NETWORK lOK OHM 2 1 0 R004 548 0413 000 RES 1100 OHM l 2W 1 1 0 ROOS 548 0262 000 RES 4 75K OHM l 8W 1 1 0 R006 540 0072 000 RES 9 lK OHM l 2W 5 1 0 R007 540 0081 0...

Page 113: ...RES 3740 OHM l 4W 1 1 0 R44 540 1143 000 RES 24 0K OHM 1 2W 5 1 0 R45 550 0317 000 POT 2000 OHM 3 4W 10 1 0 R46 548 0414 000 RES 8870 OHM l 4W 1 1 0 R47 548 0816 000 RES 10 5K OHM 1 4W 1 1 0 R48 548 0280 000 RES 3740 OHM 1 4W 1 1 0 R049 548 1440 000 RES 25 5K OHM l 4W 1 1 0 R053 R054 540 0047 000 RES 820 0 OHM l 2W 5 2 0 R55 R56 540 1112 000 RES 510 0 OHM l 2W 5 2 0 Ul U2 U3 382 0552 000 IC TL074C...

Page 114: ...CAP 10 UF 25V 20 1 0 C014 506 0230 000 CAP OOlUF 63V 5 1 0 C015 516 0453 000 CAP lUF 100V 20 1 0 C016 C017 522 0524 000 CAP 10 UF 25V 20 2 0 C018 C019 C020 516 0453 000 CAP lUF 100V 20 3 0 C021 526 0050 000 CAP 1 UF 35V 20 1 0 C022 C023 516 0453 000 CAP lUF 100V 20 2 0 C026 C027 C028 522 0524 000 CAP 10 UF 25V 20 3 0 C029 526 0047 000 CAP 220UF lOV 20 1 0 C030 522 0524 000 CAP 10 UF 25V 20 1 0 C03...

Page 115: ...65 1 0 Q004 Q005 Q006 380 0126 000 TRANSISTOR 2N4403 3 0 R001 540 0936 000 RES 10 0K OHM 1 4W 5 1 0 R002 R003 540 0929 000 RES 5 lK OHM 1 4W 5 2 0 R004 540 0936 000 RES 10 0K OHM 1 4W 5 1 0 ROOS 550 0797 000 POT SOK OHM SW 10 1 0 R006 540 0971 000 RES 300 0K OHM 1 4W 5 1 0 R007 R008 540 0943 000 RES 20 0K OHM 1 4W 5 2 0 R009 540 0881 000 RES 51 0 OHM l 4W 5 1 0 R010 540 0936 000 RES 10 0K OHM 1 4W...

Page 116: ...RES LOK OHM l 4W 5 1 0 R053 540 0936 000 RES 10 0K OHM l 4W 5 1 0 __ R054 550 0841 000 POT 50 OHM l 2W 10 1 0 ROSS 540 1351 000 RES 2 2 OHM 1 4W 5 1 0 R056 540 0984 000 RES 1 0M OHM 1 4W 5 1 0 R057 R058 540 0915 000 RES 1 3K OHM 1 4W 5 2 0 R059 540 0943 000 RES 20 0K OHM 1 4W 5 1 0 R060 540 0936 000 RES 10 0K OHM 1 4W 5 1 0 R061 540 0943 000 RES 20 0K OHM 1 4W 5 1 0 R062 540 0936 000 RES 10 0K OHM...

Page 117: ... 1 2W 5 Rlll 4 0 R112 R113 540 0928 000 RES 4 7K OHM 1 4W 5 2 0 R114 540 0922 000 RES 2 7K OHM 1 4W 5 1 0 R115 R116 540 0936 000 RES 10 0K OHM l 4W 5 2 0 R117 548 1467 000 RES 1470 OHM 1 SW 1 1 0 R118 540 0919 000 RES 2 0K OHM 1 4W 5 1 0 Rl19 R120 548 1147 000 RES 4750 OHM 1 4W 1 2 0 Rl21 Rl22 548 1521 000 RES 8060 OHM l 4W 1 2 0 Rl23 R124 540 0960 000 RES 100 0K OHM 1 4W 5 2 0 Rl25 540 0945 000 R...

Page 118: ...540 0918 000 RES 1 8K OHM 1 4W 5 1 0 R182 548 0742 000 RES 10K OHM 1 4W 1 1 0 R183 540 0926 000 RES 3 9K OHM 1 4W 5 1 0 R184 R185 R186 540 0919 000 RES 2 0K OHM l 4W 5 R187 R188 R190 R191 Rl92 R193 Rl94 R195 R196 R197 R198 Rl99 R200 R201 R202 R203 R204 R205 R206 R207 23 0 R208 R209 540 0916 000 RES 1 5K OHM 1 4W 5 2 0 R210 540 0929 000 RES 5 lK OHM 1 4W 5 1 0 R211 550 0621 000 POT 200 OHM 5W 10 1 ...

Page 119: ...908 1 0 U015 U016 382 0552 000 IC TL074CN3 2 0 U017 382 0593 000 IC TL072ACP 1 0 U018 U019 U020 382 0443 000 IC CD4053BE 3 0 U021 382 0552 000 IC TL074CN3 1 0 XU001 XU003 404 0674 000 SOCKET IC 14 CONT XU004 XU005 4 0 XU006 404 0675 000 SOCKET IC 16 CONT 1 0 XU007 XU008 404 0674 000 SOCKET IC 14 CONT XU009 XU015 XU016 s o XU017 404 0673 000 SOCKET IC 8 CONT 1 0 XU018 XU019 404 0675 000 SOCKET IC 1...

Page 120: ...CAP 10 UF 25V 20 1 0 C014 506 0230 000 CAP OOlUF 63V 5 1 0 C015 516 0453 000 CAP lUF 100V 20 1 0 C016 C017 522 0524 000 CAP 10 UF 25V 20 2 0 C018 C019 C020 516 0453 000 CAP lUF 100V 20 3 0 C021 526 0050 000 CAP 1 UF 35V 20 1 0 C022 C023 516 0453 000 CAP lUF 100V 20 2 0 C026 C027 C028 522 0524 000 CAP 10 UF 25V 20 3 0 C029 526 0047 000 CAP 220UF lOV 20 1 0 C030 522 0524 000 CAP 10 UF 25V 20 1 0 C03...

Page 121: ...65 1 0 Q004 Q005 Q006 380 0126 000 TRANSISTOR 2N4403 3 0 R001 540 0936 000 RES 10 0K OHM 1 4W 5 1 0 R002 R003 540 0929 000 RES 5 lK OHM 1 4W 5 2 0 R004 540 0936 000 RES 10 0K OHM 1 4W 5 1 0 ROOS 550 0797 000 POT 50K OHM SW 10 1 0 R006 540 0971 000 RES 300 0K OHM 1 4W 5 1 0 R007 R008 540 0943 000 RES 20 0K OHM l 4W 5 2 0 R009 540 0881 000 RES 51 0 OHM 1 4W 5 1 0 R010 540 0936 000 RES 10 0K OHM l 4W...

Page 122: ...RES I OK OHM l 4W 5 1 0 R053 540 0936 000 RES 10 0K OHM 1 4W 5 1 0 R055 540 1351 000 RES 2 2 OHM l 4W 5 1 0 R056 540 0984 000 RES 1 0M OHM l 4W 5 1 0 R057 R058 540 0915 000 RES 1 3K OHM l 4W 5 2 0 R059 540 0943 000 RES 20 0K OHM l 4W 5 1 0 R060 540 0936 000 RES 10 0K OHM 1 4W 5 1 0 R061 540 0943 000 RES 20 0K OHM l 4W 5 1 0 R062 540 0936 000 RES 10 0K OHM l 4W 5 1 0 R063 R064 540 0933 000 RES 7 5K...

Page 123: ...S 4 7K OHM l 4W 5 2 0 R114 540 0922 000 RES 2 7K OHM 1 4W 5 1 0 Rll5 R116 540 0936 000 RES 10 0K OHM l 4W 5 2 0 Rl17 548 1467 000 RES 1470 OHM 1 8W 1 1 0 R118 540 0919 000 RES 2 0K OHM 1 4W 5 1 0 Rll9 R120 548 1147 000 RES 4750 OHM 1 4W 1 2 0 R121 R122 548 1521 000 RES 8060 OHM 1 4W 1 2 0 R123 R124 540 0960 000 RES 100 0K OHM l 4W 5 2 0 Rl25 540 0945 000 RES 24 0K OHM 1 4W 5 1 0 R126 R127 550 1013...

Page 124: ...4W 5 1 0 R182 548 0742 000 RES 10K OHM l 4W 1 1 0 R183 540 0926 000 RES 3 9K OHM l 4W 5 1 0 R184 Rl85 R186 540 0919 000 RES 2 0K OHM 1 4W 5 R187 R188 R190 Rl91 R192 R193 R194 R195 R196 R197 R198 R199 R200 R201 R202 R203 R204 R205 R206 R207 23 0 R208 R209 540 0916 000 RES 1 5K OHM 1 4W 5 2 0 R210 540 0929 000 RES 5 lK OHM 1 4W 5 1 0 R211 550 0621 000 POT 200 OHM SW 10 1 0 R214 540 0952 000 RES 47 O...

Page 125: ...U017 382 0593 000 IC TL072ACP 1 0 U018 U019 U020 382 0443 000 IC CD4053BE 3 0 U021 382 0552 000 IC TL074CN3 1 0 XU001 XU003 404 0674 000 SOCKET IC 14 CONT XU004 XU005 4 0 XU006 404 0675 000 SOCKET IC 16 CONT 1 0 XU007 XU008 404 0674 000 SOCKET IC 14 CONT XU009 XU015 XU016 5 0 XU017 404 0673 000 SOCKET IC 8 CONT 1 0 XU018 XU019 404 0675 000 SOCKET IC 16 CONT XU020 3 0 XU021 404 0674 000 SOCKET IC 1...

Page 126: ...00 CAP lUF 100V 20 1 0 C024 516 0067 000 CAP DISC 003UF lKV 20 1 0 C025 500 0916 000 CAP 270PF 500VDC 1 1 0 C026 C027 C028 500 0843 000 CAP MICA 910PF lOOV 5 3 0 C029 500 0780 000 CAP 1500 PF 500V 5 1 0 C030 500 0935 000 CAP 360 PF 500VDC 5 1 0 C031 500 1007 000 CAP 3900PF 500V 5 1 0 C032 516 0067 000 CAP DISC 003UF lKV 20 1 0 C033 500 0826 000 CAP MICA 120PF 500V 5 1 0 C034 C035 506 0233 000 CAP ...

Page 127: ...1 000 COIL VAR 147 430UH 1 0 P001 P002 P003 610 0679 000 PLUG SHORTING P004 P005 5 0 Q001 Q002 Q003 380 0189 000 TRANSISTOR 2N3904 3 0 R001 R002 540 0960 000 RES 100 0K OHM 1 4W 5 2 0 R003 R004 540 0047 000 RES 820 0 OHM l 2W 5 2 0 R005 R006 R007 540 0960 000 RES 100 0K OHM l 4W 5 3 0 R008 540 0912 000 RES LOK OHM 1 4W 5 1 0 R009 R010 R011 540 0919 000 RES 2 0K OHM 1 4W 5 R012 4 0 R013 540 0957 00...

Page 128: ... OHM 1 4W 5 1 0 R068 540 0907 000 RES 620 0 OHM 1 4W 5 1 0 R073 540 0935 000 RES 9 lK OHM 1 4W 5 1 0 R074 540 0930 000 RES 5 6K OHM 1 4W 5 1 0 R075 R076 540 0933 000 RES 7 5K OHM l 4W 5 2 0 R077 R078 548 0531 000 RES 10K OHM 1 8W 1 2 0 R079 550 0813 000 POT 2K OHM 1 2W 10 1 0 ROSO 540 0935 000 RES 9 lK OHM 1 4W 5 1 0 R081 540 0936 000 RES 10 0K OHM 1 4W 5 1 0 R082 540 0966 000 RES 180 0K OHM 1 4W ...

Page 129: ... OHM 1 4W 5 1 0 R127 540 0960 000 RES 100 0K OHM 1 4W 5 1 0 Rl28 540 0912 000 RES 1 0K OHM l 4W 5 1 0 Rl29 550 0760 000 POT 20K OHM SW 10 1 0 R130 540 0943 000 RES 20 0K OHM l 4W 5 1 0 Rl31 540 0962 000 RES 120 0K OHM l 4W 5 1 0 R132 540 0960 000 RES 100 0K OHM 1 4W 5 1 0 Rl33 540 0912 000 RES LOK OHM 1 4W 5 1 0 Rl34 R135 540 0957 000 RES 75 0K OHM 1 4W 5 2 0 R136 540 0964 000 RES 150 0K OHM l 4W ...

Page 130: ... 000 382 0552 000 382 0631 000 382 0443 000 382 0552 000 382 0510 000 404 0674 000 404 0675 000 404 0673 000 404 0675 000 DESCRIPTION POT 200K OHM l 2W RES 10 0K OHM l 4W 5 RES 2 0K OHM l 4W 5 RES l OK OHM 1 4W 5 RES 15 0K OHM l 4W 5 RES 10 0K OHM l 4W 5 RES 15 0K OHM l 4W 5 RES 4 7K OHM 1 4W 5 RES 30 0K OHM l 4W 5 RES 15 0K OHM 1 4W 5 RES 22 0K OHM l 4W 5 RES 100 0K OHM 1 4W 5 SW TOGGLE SPDT HEAD...

Page 131: ...0 SOCKET IC 8 CONT 2 0 XU026 XU027 404 0675 000 SOCKET IC 16 CONT 2 0 XU028 XU029 404 0674 000 SOCKET IC 14 CONT XU030 XU031 4 0 XU032 404 0675 000 SOCKET IC 16 CONT 1 0 XU033 XU034 404 0674 000 SOCKET IC 14 CONT 2 0 XU035 404 0675 000 SOCKET IC 16 CONT 1 0 302 0460 000 SCREW 4 40 X 3 8 1 358 1881 000 EJECTOR KIT CARD 1 404 0513 000 HEAT SINK PAl lCB 5 11uoo2 11uoo4 410 0335 000 INSULATOR SCREW 2 ...

Page 132: ...37 000 CAP MICA 510PF 500V 5 1 0 C017 500 0830 000 CAP MICA 240UUF 500V 1 0 C018 500 0837 000 CAP MICA 510PF 500V 5 1 0 C019 500 0830 000 CAP MICA 240UUF 500V 1 0 C020 500 0837 000 CAP MICA 510PF 500V 5 1 0 C021 500 0830 000 CAP MICA 240UUF 500V 1 0 C022 500 0837 000 CAP MICA 510PF 500V 5 1 0 C023 500 0830 000 CAP MICA 240UUF 500V 1 0 C024 500 0837 000 CAP MICA 510PF 500V 5 1 0 C025 500 0830 000 C...

Page 133: ...540 0598 000 548 0997 000 540 0073 000 540 1116 000 548 1361 000 604 0979 000 382 0552 000 382 0443 000 382 0552 000 382 0360 000 382 0279 000 DESCRIPTION RLY LATCHING CC 69 CHOKE RF 3300 UH 80 MA CHOKE 15 000 UH TRANSISTOR 2N3904 RES 10 0K OHM 1 2W 5 RES 4 3K OHM 1 2W 5 RES NETWORK 10K OHM 2 RES 510 0K OHM 1 4W 5 POT 10K OHM 3 4W 10 RES 100 0 OHM 1 2W 5 RES 3 0K OHM l 2W 5 RES 1 0M OHM l 4W 5 RES...

Page 134: ... 0 XU1 XU2 XU3 404 0674 000 SOCKET IC 14 CONT 3 0 XU004 404 0675 000 SOCKET IC 16 CONT 1 0 XU5 XU8 404 0674 000 SOCKET IC 14 CONT 2 0 XU009 XU010 404 0675 000 SOCKET IC 16 CONT xuo11 xuo12 4 0 XU014 404 0673 000 SOCKET IC 8 CONT 1 0 302 0460 000 SCREW 4 40 X 3 8 1 358 1881 000 EJECTOR KIT CARD 1 IIU001 IIU007 404 0513 000 HEAT SINK PAl lCB 2 11uoo1 11uoo1 410 0381 000 INSULATOR 562 X 812 2 7 32 88...

Page 135: ... CAP MICA 220PF 500V 5 1 0 C017 500 0759 000 CAP MICA lOOPF SOOV 5 1 0 C018 500 0756 000 CAP MICA 330PF 500V 5 1 0 C019 500 0759 000 CAP MICA lOOPF 500V 5 1 0 C020 500 0839 000 CAP MICA 620PF 300V 5 1 0 C021 500 0759 000 CAP MICA lOOPF 500V 5 1 0 C022 500 0838 000 CAP MICA 560PF 300V 5 1 0 C023 500 0759 000 CAP MICA lOOPF SOOV 5 1 0 C024 500 0830 000 CAP MICA 240UUF 500V 1 0 C025 500 0759 000 CAP ...

Page 136: ...0 CAP MICA 36UUF 500V 1 0 C084 500 0822 000 CAP MICA 75PF 500V 5 1 0 C085 500 0761 000 CAP MICA 150PF 500V 5 1 0 C086 C087 516 0453 000 CAP lUF 100V 20 2 0 C088 518 0054 000 CAP VAR 15 60PF 200V 1 0 C089 500 0807 000 CAP MICA 18UUF 500V 1 0 C090 500 0814 000 CAP MICA 36UUF 500V 1 0 C091 500 0822 000 CAP MICA 75PF 500V 5 1 0 C092 500 0761 000 CAP MICA 150PF 500V 5 1 0 C093 516 0453 000 CAP lUF lOOV...

Page 137: ...009 380 0189 000 TRANSISTOR 2N3904 3 0 QOlO 380 0319 000 TRANSISTOR MPS A14 1 0 Q011 Q012 Q013 380 0189 000 TRANSISTOR 2N3904 Q014 4 0 R001 540 0912 000 RES LOK OHM 1 4W 5 1 0 R002 540 0939 000 RES 13 0K OHM 1 4W 5 1 0 R003 R004 540 0888 000 RES 100 0 OHM l 4W 5 2 0 ROOS 540 0923 000 RES 3 0K OHM l 4W 5 1 0 R006 548 2056 000 RES 422 OHM l 4W 1 1 0 R007 548 0279 000 RES 2000 OHM 1 4W 1 1 0 R008 548...

Page 138: ...0 RES 412 OHM 1 4 1 1 0 R048 548 0279 000 RES 2000 OHM l 4W 1 1 0 R049 548 0687 000 RES 1960 OHM l 4W 1 1 0 ROSO 548 0733 000 RES 412 OHM 1 4 1 1 0 R051 548 0279 000 RES 2000 OHM l 4W 1 1 0 R052 548 0687 000 RES 1960 OHM l 4W 1 1 0 R053 548 0861 000 RES 487 OHM l 4W 1 1 0 R054 548 0279 000 RES 2000 OHM l 4W 1 1 0 R055 548 2071 000 RES 2260 OHM 1 4W 1 1 0 R058 R059 540 0936 000 RES 10 0K OHM 1 4W 5...

Page 139: ...0908 000 RES 680 0 OHM l 4W 5 2 0 Rl08 540 0888 000 RES 100 0 OHM 1 4W 5 1 0 R109 540 0943 000 RES 20 0K OHM l 4W 5 1 0 RllO 540 0892 000 RES 150 0 OHM 1 4W 5 1 0 Rlll Rl12 540 0912 000 RES l OK OHM l 4W 5 2 0 R113 540 0936 000 RES 10 0K OHM 1 4W 5 1 0 R114 540 0912 000 RES LOK OHM l 4W 5 1 0 Rll5 540 0936 000 RES 10 0K OHM 1 4W 5 1 0 Rll6 540 0912 000 RES LOK OHM l 4W 5 1 0 Rll7 540 0919 000 RES ...

Page 140: ... 000 SOCKET IC 16 CONT 1 0 XUOOl 404 0673 000 SOCKET IC 8 CONT 1 0 XU002 XU003 404 0674 000 SOCKET IC 14 CONT XU004 XU005 4 0 XU007 404 0673 000 SOCKET IC 8 CONT 1 0 XU008 404 0509 000 SOCKET IC 28 PIN 1 0 XU009 XU010 404 0674 000 SOCKET IC 14 CONT XU011 XU015 4 0 XU016 404 0675 000 SOCKET IC 16 CONT 1 0 XU017 404 0674 000 SOCKET IC 14 CONT 1 0 YOOl 444 2781 000 CRYSTAL 4 0960 MHZ 1 0 302 0460 000...

Page 141: ...0 2 0 C006 516 0375 000 CAP OlUF SOV 1 0 C007 C008 C009 516 0453 000 CAP lUF 100V 20 3 0 LOOl 917 1278 006 COIL TOROID 1 0 Q001 Q002 380 0622 000 TRANSISTOR U310 2 0 R001 550 0949 000 POT 100K OHM 1 2W 10 1 0 R002 540 0940 000 RES 15 0K OHM 1 4W 5 1 0 R003 540 0888 000 RES 100 0 OHM l 4W 5 1 0 R004 540 0904 000 RES 470 0 OHM 1 4W 5 1 0 ROOS 540 0888 000 RES 100 0 OHM l 4W 5 1 0 R006 540 0960 000 R...

Page 142: ... 1 0 C023 C024 500 0912 000 CAP 820 PF 500V 5 2 0 C025 506 0241 000 CAP 047UF 63V 5 1 0 DS1 DS2 DS3 DS4 384 0610 000 LED GREEN 4 0 P001 P002 P003 610 0679 000 PLUG SHORTING 3 0 Ql 380 0189 000 TRANSISTOR 2N3904 1 0 Q002 Q003 380 0586 000 TRANSISTOR MJE200 2 0 Q004 380 0587 000 TRANSISTOR MJE210 1 0 Q005 Q006 380 0586 000 TRANSISTOR MJE200 2 0 R001 R002 540 1111 000 RES 10 0K OHM l 2W 5 2 0 R003 R0...

Page 143: ...OIL TOROID 1 0 Ul 382 0475 000 IC 317 1 0 U002 382 0874 000 IC LM337K 1 0 U3 382 0475 000 IC 317 1 0 U004 382 0874 000 IC LM337K 1 0 IJQ003 IIQ004 404 0729 000 HEAT SINK FOR T0 220 IIQ005 IIQ006 1 11uoo1 11uoo2 410 0383 000 INSULATOR T0 3 MICA flU003 I U004 4 IIU00l IIU002 410 0384 000 INSULATOR 4 SCREW U003 IIU004 8 839 6202 005 HEAT SINK 2 839 6202 019 SCHEMATIC POWER SUPPLY 0 943 4035 025 PWB P...

Page 144: ... lA AM STEREO EXCITER 994 8730 004 REF SYMBOL A6A1Cl FREQ DET HARRIS PART NO 994 8730 003 500 0759 000 DESCRIPTION BASIC AM STEREO EXCITER CAP MICA lOOPF 500V 5 7 42 888 2174 001 WARNING Disconnect primary power prior to servicing QTY 1 0 UM ...

Page 145: ...250 0274 000 843 4035 002 888 2174 001 992 6088 002 992 6116 001 992 6267 002 DESCRIPTION CB BX 24 75 X21 X17 POWER CORD 7 1 2 FT FAMILY TREE TM STX lA AM STEREO BASIC AM STEREO EXCITER CARD EXTENDER STX 1 PACKING CHECK LIST 888 2174 001 WARNING Disconnect primary power prior to servicing QTY 1 1 0 1 1 1 0 UM 7 43 ...

Page 146: ...ENERATOR BOARD AUDIO OUTPUT PC BD RF OUTPUT BOARD APPEARS ON HIGHER LEVEL SUB ASSY P 0 THIS BILL CAP AND CHAIN BNC CW123 U SW ROCKER DPDT METER MODULATION MULTIMETER 0 100 0 30 SCL POWER SUPPLY PC BD CAP 2900 UF 50V FILTER RFI POWER LINE FUSE SLOW CART 4A 125V RES 27 4K OHM l 4W 1 RES 51 lK OHM l 4W 1 RES 182K OHM 1 4W 1 RES 243K OHM 1 4W 1 TERM STRIP 8 1 8 GND XFMR POWER SCREW 6 32 X 3 8 SCREW 6 ...

Page 147: ...045 939 5695 184 939 6202 006 939 6202 029 943 4035 017 943 4035 024 999 2175 001 999 2176 001 DESCRIPTION CABLE MAIN FRAME CABLE RIBBON A2Pl AlP17 COVER ACCESS COVER FRONT CHASSIS TOP PANEL METER WIRE TUBING LIST HARDWARE LIST 888 2174 001 WARNING Disconnect primary power prior to servicing QTY 1 1 1 1 1 1 1 1 UM 7 45 ...

Page 148: ...CAP 10 UF 25V 20 1 0 C014 506 0230 000 CAP OOl UF 63V 5 1 0 C015 516 0453 000 CAP lUF 100V 20 1 0 C016 C017 522 0524 000 CAP 10 UF 25V 20 2 0 C018 C019 C020 516 0453 000 CAP lUF lOOV 20 3 0 C021 526 0050 000 CAP 1 UF 35V 20 1 0 C022 C023 516 0453 000 CAP lUF 100V 20 2 0 C026 C027 C028 522 0524 000 CAP 10 UF 25V 20 3 0 C029 526 0047 000 CAP 220UF lOV 20 1 0 C030 522 0524 000 CAP 10 UF 25V 20 1 0 C0...

Page 149: ...65 1 0 Q004 Q005 Q006 380 0126 000 TRANSISTOR 2N4403 3 0 R001 540 0936 000 RES 10 0K OHM l 4W 5 1 0 R002 R003 540 0929 000 RES 5 lK OHM l 4W 5 2 0 R004 540 0936 000 RES 10 0K OHM 1 4W 5 1 0 ROOS 550 0797 000 POT SOK OHM 5W 10 1 0 R006 540 0971 000 RES 300 0K OHM 1 4W 5 1 0 R007 R008 540 0943 000 RES 20 0K OHM l 4W 5 2 0 R009 540 0881 000 RES 51 0 OHM l 4W 5 1 0 R010 540 0936 000 RES 10 0K OHM l 4W...

Page 150: ...0 RES LOK OHM 1 4W 5 1 0 R053 540 0936 000 RES IO OK OHM l 4W 5 1 0 ROSS 540 1351 000 RES 2 2 OHM l 4W 5 1 0 R056 540 0984 000 RES 1 0M OHM l 4W 5 1 0 R057 R058 540 0915 000 RES 1 3K OHM l 4W 5 2 0 R059 540 0943 000 RES 20 0K OHM l 4W 5 1 0 R060 540 0936 000 RES 10 0K OHM l 4W 5 1 0 R061 540 0943 000 RES 20 0K OHM l 4W 5 1 0 R062 540 0936 000 RES 10 0K OHM l 4W 5 1 0 R063 R064 540 0933 000 RES 7 S...

Page 151: ... RES 4 7K OHM l 4W 5 2 0 R114 540 0922 000 RES 2 7K OHM 1 4W 5 1 0 R115 R116 540 0936 000 RES 10 0K OHM 1 4W 5 2 0 R117 548 1467 000 RES 1470 OHM 1 SW 1 1 0 R118 540 0919 000 RES 2 0K OHM 1 4W 5 1 0 R119 Rl20 548 1147 000 RES 4750 OHM 1 4W 1 2 0 R121 R122 548 1521 000 RES 8060 OHM 1 4W 1 2 0 R123 R124 540 0960 000 RES 100 0K OHM 1 4W 5 z o R125 540 0945 000 RES 24 0K OHM 1 4W 5 1 0 R126 R127 550 0...

Page 152: ...10 0 OHM 1 4W 5 548 0742 000 RES 10K OHM 1 4W 1 540 0952 000 RES 47 0K OHM l 4W 5 548 0543 000 RES 56 2K OHM l 8W 1 540 0919 000 RES 2 0K OHM l 4W 5 540 0918 000 RES 1 8K OHM 1 4W 5 548 0742 000 RES 10K OHM 1 4W 1 540 0926 000 RES 3 9K OHM l 4W 5 540 0919 000 RES 2 0K OHM 1 4W 5 540 0916 000 540 0929 000 550 0621 000 540 0952 000 540 0888 000 540 0952 000 540 0888 000 540 0952 000 604 0981 000 604...

Page 153: ...U017 382 0593 000 IC TL072ACP 1 0 U018 U019 U020 382 0443 000 IC CD4053BE 3 0 U021 382 0552 000 IC TL074CN3 1 0 XU001 XU003 404 0674 000 SOCKET IC 14 CONT XU004 XU005 4 0 XU006 404 0675 000 SOCKET IC 16 CONT 1 0 XU007 XU008 404 0674 000 SOCKET IC 14 CONT XU009 XU015 XU016 5 0 XU017 404 0673 000 SOCKET IC 8 CONT 1 0 XU018 XU019 404 0675 000 SOCKET IC 16 CONT XU020 3 0 XU021 404 0674 000 SOCKET IC 1...

Page 154: ...0 500 0825 000 CAP MICA llOPF 500V 5 1 0 C021 500 0843 000 CAP MICA 910PF 100V 5 1 0 C022 500 0811 000 CAP MICA 27UUF 500V 1 0 C023 516 0453 000 CAP lUF 100V 20 1 0 C024 516 0067 000 CAP DISC 003UF lKV 20 1 0 C025 500 0916 000 CAP 270PF 500VDC 1 1 0 C026 C027 C028 500 0843 000 CAP MICA 910PF lOOV 5 3 0 C029 500 0780 000 CAP 1500 PF 500V 5 1 0 C030 500 0935 000 CAP 360 PF 500VDC 5 1 0 C031 500 1007...

Page 155: ...1 0 LDROOl 670 0033 000 LED LOR 1 0 LOOl 492 0641 000 COIL VAR 147 430UH 1 0 L002 494 0414 000 CHOKE RF 390UH 1 0 L003 494 0190 000 CHOKE RF 3300 UH 80 MA 1 0 1004 492 0641 000 COIL VAR 147 430UH 1 0 P001 P002 P003 610 0679 000 PLUG SHORTING P004 P005 s o Q001 Q002 Q003 380 0189 000 TRANSISTOR 2N3904 3 0 R001 R002 540 0960 000 RES 100 0K OHM l 4W 5 2 0 R003 R004 540 0047 000 RES 820 0 OHM 1 2W 5 2...

Page 156: ...RES 15 0K OHM l 4W 5 RES lOK OHM l 8W 1 RES 270 0 OHM l 4W 5 RES 3 0K OHM l 4W 5 RES 33 0K OHM l 4W 5 RES 3 0K OHM l 4W 5 RES 680 0 OHM l 4W 5 RES l OK OHM l 4W 5 RES 2 0K OHM l 4W 5 RES l OK OHM l 4W 5 RES 2 2K OHM l 4W 5 RES 390 0K OHM l 4W 5 POT lOOK OHM 5W 10 RES 1 5K OHM l 4W 5 RES 270 0 OHM l 4W 5 RES 3 6K OHM l 4W 5 RES 1 8K OHM l 4W 5 RES 1 0K OHM l 4W 5 RES l lK OHM l 4W 5 RES 1 6K OHM l ...

Page 157: ... OHM l 4W 5 1 0 R123 540 0972 000 RES 330 0K OHM 1 4W 5 1 0 R124 540 0968 000 RES 220 0K OHM 1 4W 5 1 0 Rl25 540 0916 000 RES 1 5K OHM 1 4W 5 1 0 R126 540 0962 000 RES 120 0K OHM 1 4W 5 1 0 R127 540 0960 000 RES 100 0K OHM 1 4W 5 1 0 R128 540 0912 000 RES LOK OHM l 4W 5 1 0 R129 550 0760 000 POT 20K OHM 5W 10 1 0 R130 540 0943 000 RES 20 0K OHM 1 4W 5 1 0 Rl31 540 0962 000 RES 120 0K OHM 1 4W 5 1 ...

Page 158: ...60 000 IC 7915 1 0 U003 382 0273 000 IC LM340T 8 UA7808 1 0 U004 382 0385 000 IC 7908 1 0 uoos 382 0184 000 IC 340T 5 7805 5V REG 1 0 U006 382 0552 000 IC TL074CN3 1 0 U007 382 0879 000 IC AD535JD 1 0 U008 382 0664 000 IC SD5000N 1 0 U009 U010 U011 382 0472 000 IC LM318 3 0 U012 382 0443 000 IC CD4053BE 1 0 U013 382 0552 000 IC TL074CN3 1 0 U014 382 0880 000 IC TBA120S 1 0 U015 382 0617 000 IC LM3...

Page 159: ...2 0 XU026 XU027 404 0675 000 SOCKET IC 16 CONT 2 0 XU028 XU029 404 0674 000 SOCKET IC 14 CONT XU030 XU031 4 0 XU032 404 0675 000 SOCKET IC 16 CONT LO XU033 XU034 404 0674 000 SOCKET IC 14 CONT 2 0 XU035 404 0675 000 SOCKET IC 16 CONT 1 0 302 0460 000 SCREW 4 40 X 3 8 1 358 1881 000 EJECTOR KIT CARD 1 11uoo1 11uoo2 404 0513 000 HEAT SINK PAl lCB IIU003 IIU004 fluoos 5 f U002 flU004 410 0335 000 INS...

Page 160: ...CA 330PF 500V 5 1 0 C019 500 0759 000 CAP MICA lOOPF 500V 5 1 0 C020 500 0839 000 CAP MICA 620PF 300V 5 1 0 C021 500 0759 000 CAP MICA lOOPF 500V 5 1 0 C022 500 0838 000 CAP MICA 560PF 300V 5 1 0 C023 500 0759 000 CAP MICA lOOPF 500V 5 1 0 C024 500 0830 000 CAP MICA 240UUF 500V 1 0 C025 500 0759 000 CAP MICA lOOPF 500V 5 1 0 C026 500 0784 000 CAP 300PF 500V 5 1 0 C027 500 0759 000 CAP MICA lOOPF 5...

Page 161: ...00 0761 000 CAP MICA 150PF 500V 5 1 0 C082 C083 516 0453 000 CAP lUF 100V 20 2 0 C084 516 0375 000 CAP OlUF 50V 1 0 C085 500 0838 000 CAP MICA 560PF 300V 5 1 0 C086 C087 C088 516 0453 000 CAP lUF 100V 20 C089 C090 C091 6 0 C092 500 0811 000 CAP MICA 27UUF 500V 1 0 C093 C094 516 0453 000 CAP lUF lOOV 20 2 0 C095 500 0811 000 CAP MICA 27UUF 500V 1 0 C096 C097 516 0453 000 CAP lUF 100V 20 2 0 C098 50...

Page 162: ...548 0279 000 548 2057 000 548 0307 000 548 0279 000 548 0375 000 548 0406 000 DESCRIPTION CAP lUF 100V 20 CAP 100UF 20V 20 CAP VAR 5 5 18PF CAP MICA 12UUF 500V CAP MICA 75PF 500V 5 CAP 015UF 50V 5 CAP lUF 100V 20 CAP OlUF SOV CAP MICA lOOOPF 100V 5 CAP lUF lOOV 20 CAP lUF 63V 5 L E D GREEN PLUG SHORTING CHOKE RF 820 0UH CHOKE RF 1000 0UH CHOKE RF 470 0UH CHOKE RF 330 0UH CHOKE RF 3300 UH 80 MA CHO...

Page 163: ... 1 1 0 R046 548 0310 000 RES 2430 OHM 1 4W 1 1 0 R047 548 0733 000 RES 412 OHM 1 4 1 1 0 R048 548 0279 000 RES 2000 OHM 1 4W 1 1 0 R049 548 0687 000 RES 1960 OHM 1 4W 1 1 0 ROSO 548 0733 000 RES 412 OHM 1 4 1 1 0 R051 548 0279 000 RES 2000 OHM 1 4W 1 1 0 R052 548 0687 000 RES 1960 OHM 1 4W 1 1 0 R053 548 0861 000 RES 487 OHM 1 4W 1 1 0 R054 548 0279 000 RES 2000 OHM 1 4W 1 1 0 ROSS 548 2071 000 RE...

Page 164: ... 000 RES 1 0K OHM 1 4W 5 3 0 R106 540 0888 000 RES 100 0 OHM 1 4W 5 1 0 R107 R108 540 0912 000 RES 1 0K OHM 1 4W 5 2 0 Rl09 540 0923 000 RES 3 0K OHM 1 4W 5 1 0 Rll0 550 0957 000 POT 500 OHM 1 2 W10 1 0 Rlll 540 0912 000 RES 1 0K OHM 1 4W 5 1 0 R112 540 0921 000 RES 2 4K OHM l 4W 5 1 0 Rll3 Rll4 540 0876 000 RES 33 0 OHM 1 4W 5 2 0 R115 540 0921 000 RES 2 4K OHM 1 4W 5 1 0 Rl16 550 0957 000 POT 50...

Page 165: ... 404 0674 000 444 2781 000 302 0460 000 335 0104 000 358 0477 000 358 1881 000 410 0335 000 410 0381 000 DESCRIPTION RES 680 0 OHM l 4W 5 RES 47 0 OHM l 4W 5 RES 20 0K OHM 1 4W 5 RES 150 0 OHM l 4W 5 SW ROTARY 4PDT SWITCH ROCKER DIP 4 SPST SWITCH 8PST XFMR RF MODEL T4 l IC LM318 IC HAl 4605 5 IC LM318 IC MC145151P IC 74S74 IC 1496 MOD DEMOD IC 340T 5 7805 5V REG IC 7915 IC 7815 IC 74LS74 IC 74LS22...

Page 166: ...000 500 0830 000 500 0831 000 494 0188 000 494 0238 000 494 0392 000 494 0393 000 494 0394 000 494 0397 000 494 0398 000 494 0399 000 494 0400 000 494 0401 000 494 0402 000 494 0403 000 494 0404 000 494 0405 000 494 0406 000 994 8749 001 994 8750 001 DESCRIPTION BASIC AM STEREO EXCITER STX lA FREQ DET CHART CAP MICA 56UUF CAP MICA 220PF 500V 5 CAP MICA 270PF SOOV 5 CAP MICA 150PF 500V 5 CAP 200PF ...

Page 167: ...EREO MOD KIT 1 0 FORMAT 994 8849 002 SX 1 llOV STEREO MOD KIT 1 0 FORMAT 994 8849 003 SX 1 220V STEREO MOD KIT 1 0 OPTION 994 8749 001 MW 50 STEREO MOD KIT 1 0 OPTION 994 8750 001 MW 1 STEREO MOD KIT 1 0 OPTION 994 8764 001 MW 5 STEREO MOD KIT 1 0 OPTION 994 8765 001 MWD 10 STEREO MOD KIT 1 0 OPTION 994 8768 001 MW 10 STEREO MOD KIT 1 0 OPTION 994 8769 001 MWD 20 STEREO MOD KIT 1 0 OPTION 994 8801...

Page 168: ...054 0010 027 250 0274 000 888 2174 001 992 6088 003 992 6116 001 992 6267 003 DESCRIPTION CB BX 24 75 X21 Xl7 POWER CORD 7 1 2 FT TM STX lA AM STEREO BASIC AM STEREO EXCITER CARD EXTENDER PACKING CHECK LIST STX lA 7 66 888 2174 004 WARNING Disconnect primary power prior to servicing QTY 1 1 1 1 1 0 UM ...

Page 169: ... 843 4035 018 843 4035 020 DESCRIPTION METERING BOARD MOTHERBOARD AUDIO INPUT PC BD PEAK LIM SEP CORR QUADRATURE BOARD AUDIO OUTPUT PC BD RF OUTPUT BOARD APPEARS ON HIGHER LEVEL SUB ASSY P 0 THIS BILL CAP AND CHAIN BNC CW123 U POWER SUPPLY PC BOARD SW RKR DPDT METER MODULATION MULTIMETER 0 100 0 30 SCL CAP 2900 UF 50V FILTER RFI POWER LINE FUSE SLOW CART 4A 125V RES 27 4K OHM l 4W 1 RES 51 lK OHM ...

Page 170: ...02 045 939 5695 184 939 6202 006 939 6202 047 943 4035 017 943 4035 024 999 2175 001 999 2176 001 DESCRIPTION CHASSIS SIDE PANEL REAR CABLE MAIN FRAME CABLE RIBBON A2Pl A1Pl7 COVER ACCESS COVER FRONT CHASSIS TOP PANEL METER WIRE TUBING LIST HARDWARE LIST 888 2174 004 WARNING Disconnect primary power prior to servicing QTY 1 1 1 1 1 1 1 1 1 1 UM I ...

Page 171: ...500 0912 000 CAP 820 PF 500V 5 2 0 C025 506 0241 000 CAP 047UF 63V 5 1 0 C026 000 0000 003 FREQUENCY DETERMINED PART 1 0 C027 500 0878 000 CAP 1500 PF 500V 5 1 0 DS001 DS002 384 0610 000 LED GREEN DS003 DS004 4 0 LOOl 494 0414 000 CHOKE RF 390UH 1 0 1002 000 0000 003 FREQUENCY DETERMINED PART 1 0 P001 P002 P003 610 0679 000 PLUG SHORTING 3 0 QOOl 380 0189 000 XSTR 2N3904 1 0 Q002 Q003 380 0586 000...

Page 172: ...0 TOOl 000 0000 002 APPEARS ON HIGHER LEVEL 1 0 T002 917 1278 001 COIL TOROID 1 0 UOOl 382 0475 000 IC 317 1 0 U002 382 0874 000 IC LM337K 1 0 U003 382 0475 000 IC 317 1 0 U004 382 0874 000 IC LM337K 1 0 IFQ002 404 0513 000 HEAT SI NK PAl lCB 2 f Q003 1FQ004 404 0729 000 HEAT SINK FOR T0 220 ffQ005 ffQ006 l ifQ002 ltQ003 410 0381 000 INSULATOR 562 X 812 ffQ004 ffQ0O5 fFQ006 5 1fUOOl ffU002 410 038...

Page 173: ...c Quadrature Generator PC Board 992 6078 004 Sheet 2 of 2 Schematic RF Output PC Bd 992 6079 002 Sheet 1 of 2 Schematic RF Output PC Bd 992 6079 002 Sheet 2 of 2 OR Schematic RF Output PC Bd 992 6079 003 Sheet l of 2 Schematic RF Output PC Bd 992 6079 003 Sheet 2 of 2 Schematic Audio Output PC Board Sheet 1 of 2 Schematic Audio Output PC Board Sheet 2 of 2 Schematic Motherboard Mainframe Wiring ST...

Page 174: ...02 003 OR 8 9B AM Stereo Exciter Peak Limiter Separation 839 6202 028 8 37 8 38 Corrector Sheet 1 of 2 992 6202 002 8 9B AM Stereo Exciter Peak Limiter Separation 839 6202 028 8 39 8 40 Corrector Sheet 2 of 2 992 6202 002 OR 8 9C AM Stereo Exciter Peak Limiter Separation 839 6202 013 8 41 8 42 Corrector Sheet 1 of 2 992 6202 001 8 9C AM Stereo Exciter Peak Limiter Separation 839 6202 013 8 43 8 44...

Page 175: ...15p3 44 7 5 9 R8 4700 n 2 11o 8 U7 7815 7 U6 7915 6 U4 4053BC 5 UI U3 U5 TL074CN3 4 CRll CRl2 1N4737A 3 CRI CRIO CRl3 CRl4 1N4004 2 CAPACITANCE IN Uf I RESISTANCE IN OHMS l 2W 51 UNLESS OTHERWISE NOTED rl lv 18 CR9 15 R6 9 IK OOPF C7 01 RB R8 13 4 R8 7 1 4 lK C6 2700PFI i elf Cl7 4300PF CH i R8 RB 10 7 i t Cl8 2700PFI 7 5V _g Wl I ll t llo I ll l ii l 4W CRl2 C44 r I ll CRII C43 r 7 5V rd 1 lii 11...

Page 176: ...E 3 I I Kl 1 I I I I I I TCH I I I __ CRl3 IN914 I RESISTORS ARE IN OHMS 1 4 WATT 5 11 NOTES UNLESS OTHERWISE NOTED TO I OUT SH 2 METERING C P5 27 C77 PILOT AMP 15 7 Rl8 IOK II l 8W ro l 8W I ll Rl56 l a 200K wee O l 2W OFFSET 15 8 U5 340T 5 7805 7 U3 LM340T 8 UA7808 PILOT LED MONO LED STEREO LED P5 23 P5 44 P5 24 IF IN P5 26 c 11 I TP 3 3 ri LIMIT ORI flo1 F 15 UL LIMITER OFFSET P5 34 1 a i 1 024...

Page 177: ... 29 P5 37 NOTES crs 3 V 58 9 I35V F 161 bT lk6 C5l I RII 2K 15 k lc G Af OUT P5 46 C50 047 RMS DISTORTION I 3 CJg 15 DIST LIM RMS 15 ENVELOPE R84 r t Uw 6 15 Rl33 IK TJ 2 R99 IK 8 R97 120K 7 5 7 5 O TO SH I Rl37 _ 1_ __ 10 K P5 47 1 8l TP26 G OUT METERING r 14 P5 43 L R NEG MOD LIM 15 kos 4W 15 Y 2 1 Rl 30 DEG 03 15 4W rdk ll 04 15 iU 4W 90 DEG ro s r 11 2 aw 50 11 9 I i 80 11 FIGURE 8 2A SCHEMATI...

Page 178: ...4 WATT 511 NOTES UNLESS OTHERWISE NOTED PILOT AMP 15 TO I OUT SH 2 METERING C P5 278o7 7 Rl56 o 9l OFFSET 15 l 8W P IL O T LE D p 5 _23 MONO LED STEREO LED 15 Rl63 IOK P5 44 P5 24 IF IN P5 26 c 11 I 6 U6 Ul3 TL074CN3 U7 A0535JO 8 S05000N us u10Ju11 LM318 4 ituF co 40538 ui4 TBA12os u1 1 8 Y u2 0 Ns22 u 11 1 P1 Ls 74 u24 u2 Dsool tJ 8 u2k xR22oi u3 1Lo 14 F 15 R61 it 19 LIMITER OFFSET P5 34 f 1 IC ...

Page 179: ...ilv 2K P5 79 v P5 80 rAi I GND GND t w G _ w H P5 65 OU P5 66 15 CR6 P5 6 7 P5 68 CR4 7 5 P5 29 P5 37 1C8K I NOTES AF OUT TJtl P5 46 C50 047 RMS Rl33 IK DISTORTION Rli3 T 1 3 l 3 rJJk 7 5 15 RMS TJ 2 ENVELOPE nt R99 IK 15 DIST LIM 8 ii 15 r 2 7 5 r s rim 8K I 3 7 r 0 TO SH I Rl37 7 IOK P5 47 G OUT METERING C65 I TP22 Wi TP 6 1 4 P5 43 L R NEG MOD LIM 1 5 I i1 Hl ikos 4W 1 5 fY 2 g 1 07 IK 03 30 DE...

Page 180: ...9 Ul2 IS A 340T 5 7805 8 UIO AHO UII ARE 1496 7 U9 IS A 74574 9S74 6 US IS AN MCl4515IP R98 110 5 U2 U3 U4 AND U5 ARE HAl 4505 5 4 UI AND U7 ARE LM3l8 3 ALL INDUCTORS ARE IN UH 2 ALL CAPS ARE IN UF I ALL RESISTORS ARE l 4W 5l UNLESS OTHERWISE NOTED 20 015 IS AH MPS Al4 I 19 07 09 AND 011 014 ARE 2N3904 I5V RI osi 5V f5 C75 I gf 5 C 07 C74 R67 E 2K gj I5V I fo ciis8 15 C76 1 003 9 8 10 17 II 6 I 12...

Page 181: ...1r _ 1 _ __ 1 4 i 117 3 0 1 NC L 1 ISY TJl 4 Cl4 L6 i I00PF 1000 I 10 U3 3 U4 8 I 15Y I Cl7 L7 I IOOPF 1000 I iPF Rfk4 C71 1 foo 120PF 14 Cl9 L8 o 00Pf 1000 I C27 rJioutOOPF I 10 U2 15Y l5V l5Y l5Y FIGURE 8 3A SCHEMATIC RF OUTPUT PC BOARD 992 6079 002 SHEET 2 OF 2 839 6202 025 8 15 8 16 ...

Page 182: ... ALL INOUCTOIIS ARE IN UH 2 ALL CAPS ARE IN UF UNLESS OTHERWISE SPECIFIED I ALL RESISTORS ARE 25W 51 NOTES CR8 5V E7 I Rl26 1 I I NC I 0 II I I 10 I 111 I 4 I I A I I 5 I I I I S I 1 14 7 I f L 1 1 1 1 lo LL _c _ I rCl25 I 1 I i I CRT I I 8V 3 c luii7il El f IW l LLf lCll9 l Cl20 r r el P7 61 CR6 CR5 ue D 5V I ll 71 ll 7J Dc66 C68 1179 mr 10 C75 i I o O 02 H7 8 I C E 03 11 0 01 I I E R77 E 2K JI W...

Page 183: ... l I r w R2r 2K l I l I l I l I 15V 15V w m ti t43 a8 7 I ll I ll 7 I ll I ll M oJ tJ 6 o J C27 Wot LIi M or 0 o f M o 1000 mPF N i Ii se Mi sitPF fo h rii y A t I ll I ll I ll I ll R33 Rz3l Rz3l RzV 2K I ll I ll I ll I ll 15V 1 5V m 11l f n I ll I ll 14 I ll I ll C3J i tf C35 tf Mi ro PF h 80 1 c2b 100 r lt o 0 500V 0 01500 er 4 6a ri er ii In p 4 I ll I ll i e l I I ll n R24l R 8 I 7 K I ll I ll...

Page 184: ...i5or 9 3 I m l ri orI il 4 15V 4 1 9 liK A 7 t iK 10 2 1 2 1 2 11 2 11 w W I IJ 3 1 cW tJ Imr 5 _ Jmr I U5 8 41i 141ii 3 5li 12 11 tlii 2 11 2 1 2 11 2 11 II RII 3K 3 R66 IOK L f O W ltK I ior I I or 2 I ii 14 131 6i 4 s Iii 1 iii 2 1 2 1 2 1 2 1 l I 3 3 c g p I 17 U3 Ii 9 U3 401 13 40r I 2 bk 16 ik I ik 14 1ii 4 2 11 2 1 2 1 2 11 Rl3 3K I 6 10 4 1 10 8 If 9 U2 C41 401 I IUr R 15V T 91oi 71ii I 2 ...

Page 185: ...4CN3 GNO 19 15 7 5 U14 NE5532AN U6 7915 7i 1 i 91 15 2 01 02 2N3904 I CRI CR2 1N4004 CR3 CR4 1N4002 CR5 CR6 1N4737 UNLESS OTHERWISE NOTED 7 5 CR2 15 CRI 15 7 5 R70 IOK U9 114W I 4 5 f 7 5 CR5 7 5 m I roi41 ro 3 I 31 ivi 31 w 7 5 I 15 I 7 5 UIO ia 7 7 5 15 t R35 5 IK 7 Kl LATCH D I _ P6 31 P6 32 _ t 1 P6 53 I P6 54 15 2W I ftb U14 I 2W m i W I AUOIO OUT AUOIO OUT 7 5 rT m 7 5 Ft R4 IOK UII 7 5f 7 5...

Page 186: ...W 30 I I 16 00 I J5 2 l I 0 0 1 1 0 0 1 1 0 0 0 20 0 0 0 t _ I 0 0 0 o 0 h t I 0 0 40 0 0 f r Z f t 0 0 60 f 1 1 0 10 I I 0 0 19 lao TB2 MONO 8 q o STEREO 9 gso r R4 Fo 300 I I 80 I J6 2 I I 0 0 l 1 0 0 l l 0 0 0 0 0 0 f 0 0 o 0 0 0 0 I 0 o 0 0 I 0 0 lo 0 0 0 0 I I 0 10 I I 0 0 19 leo 10 0 J7 I 2 I I 0 0 I 1o 0 0 l 1 0 0 0 20 0 0 0 0 0 0 0 0 0 f 0 0 0 0 0 0 0 040 0 0 0 0 0 0 0 0 0 050 0 L _ I 60 l...

Page 187: ... CENTER TAP GND 04 j CHANGE CARO FOR 240V 0PERATI0 t SEE MANUFACTURE INSTRUCTIONS u u 0 C l j i 0 r rr rr D N 0 I _ I l l D D UI l G 05 06 10 AC A9 A9 IN R3 182K R4 243K 1 r 1 r 9 POWER SUPPLY A9AI u z I l l N l Q C 992 6086 001 z D 0 SCHEMATIC 0 i 839 6202 01 9 rr j 0 0 r r rr j j Q C rr rr rr rr rr z UI 0 N JI co a j I UI N co j m i UI l l J J l l l l N N N N N N N N N N N N N I I I I I I l I UI...

Page 188: ... 111 DAY 15 R4 10 2 K Cl fTI Tfl RI 22K tio 7 gioK PFI Jl fK R85 rov IOOK BNC C8K 15 r Jl8 tl 6 R51 R62 S2 0 0 0 0 20K CR8 Ti s 111 R83 Cl5 IOOK I 35V CR6 R k Rl6 NK T 2 2K Rl8 10 C PF f1d6K Rl7 6 8 TP6 CRI CR2 r 14 Ii v OK RII Rl2 IOK IOK ltl8K R 1 tO T 3 15 1f 41 IK 8 511 rl 2 CR9 roli CRIO I CR4 3 14 111 24 R47 OK 111 R48 20K 111 7 CR5 nfK 111 ll f6 rM44 4 QI m 15 Ii 111 J C1 Ml p5v i1J m 15 I ...

Page 189: ...IN OHMS 1 2W 511 UNLESS OTHERWISE NOTED Ig ev SK CRB l K C7 I 3 V Cl2 1 5y R4 910 cei i gv lo f13 I 35V C9 10 OS3 35V RII r v CR9 220 CIO 05V R7 IK R5 IK Cl5 I SI Cl7 R6 IHv IK OS2 Cl6 I mF RB I W cgi Rl5 I SK 1 Rl7 110 8 2W CRII CRl2 R P CRIO 1 mPF R34 IOK E15 RF METER m EIO t 1 RF SAMPLE 2W R31 t E9 rGNO E12 RF OUT Ell rGNO I35V ____________________________c_______________ EI 19V PCB PREREGULATE...

Page 190: ...RANGE 2 CAPACITANCE IN UF I RESISTANCE IN OHMS 112W 5 L U LESS OTHERWISE NOTED JI 8 i3 ov C4 I 3 V CII 5V R3 910 Cl2 5V R9 Cl3 R7 CRJ 220 I 5V IK C9 DS3 5V CR9 Cl4 5V Cl5 I rl C7 I SI 3 V i 3 V R6 IK R4 910 Cl6 S2 I y f 3 V K Rl7 110 il CRII ii l3PF Rll3 I 1 mPF ll 4 E15 S RF METER CR n w EIO RF SAMPLE IC E9 rGND E12 L RF OUT Ell rGND El L 19V PCB PREREGULATED E 2 19V PCB PREREGULATED S4 A9AI POWE...

Page 191: ...l93 2K r12 8 L R ZERO CROSSING DET C79 I B I I II ______________ C TO SHT 2 FJKE 8 g J 8 Rl69 20 L PAUSE DETECTOR Rl70 5 1 8 I llJ TJl 2 l PP4 31 L 4 32 __ I 15 8 I 7 AUTO 8 PHASE SELECT CRII 15 L R OUT CP P4 59 4 0 L R r 4 P4 45 D TO SHT 2 4 L R IN 11i i II ____ 1 J 5 CRI CR6 CRl4 CRl7 CR22 CR23 CR24 IN9I4 CR7 CRll CR26 1N4001 CR25 MZ236I 4 Ql 2N3904 Q2 MPSAl4 03 MPSA65 04 05 06 2N4403 15 C49 r r...

Page 192: ...T L R OUT DAY NIGHT TO JI SHT I 8 IN J ______ L_ _R_o_u_T ____________ A l 1N TO J2 OUT SHT I P4 23 i AtSHuslfllo RtJH i J P4 24 4 D AD J u s r _____ 1 __________________________ __J L R IN P4 71 M __ _ 19 P4 74 P4 65 M __ 1 P4 66 19 P4 67 P4 68 P4 I 2 P4 3 4 P4 77 78 P4 79 80 CRIB Rl97 2K Rl74 IK CR21 TJl 26 R O 15 R73 IK CRl2 CR24CBZ I 7 AUDIO OVERLOAD ____QS_3_ ED GREEN Ml 6 CRl3 15 8 R89 1 5 5...

Page 193: ... _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ D TO SHT 21 4 L R IN L ONLY R ONLY NEGATIVE MODULATION LIMIT l 1 l I L__ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _1 r 1 i 1 100 111 47K CRl4 i R t4 I r L R vcA 1 8c ro 1 1 15 1 __ _ m _ R 9 K 5 SYMMETRY 2 c_TI CRl 5_ µ _ _ 5 CRI CR6 CRl4 CRl7 CR22 CR23 CR24 1N9l4 CR7 CRII CR26 1N400I CR25 MZ2361 4 01 2N3904 02 MPSAl4 03 MPS A65 04 05...

Page 194: ...4 61 DAY NIGHT L R OUT TO JI SHT I 8 _JIN JS L R OUT jiN t A OUT TO J2 SHT I ___ DAY LEFT DAY RJjHT P4 23 I b lfEO b fEQ P4 24 ___________________ 4 __j L R IN L__ TJ1 22 15 GRtfN 8 P4 71 _ I 19 P4 74 P4 65 w P4 66 l9 P4 67 P4 68 CRl8 Rl97 2K RIP Rl74 IK CR21 P4 I 2 ____________ J P4 3 4 P4 77 78 P4 79 80 15 rl 2 11 73 CRl2 15 15 R L lK AUDIO OVERLOAD I _ _qS_3_____ _ ED GREEN CRl3 15 15 D ___ I _...

Page 195: ... I I K CRl4 i R 4 i L 0 2 c_TI CRl5 lfjo f B rlO mYO20 11 i z L f 1 5___ I I o Z yl Fl w9 oi1 l l s 7 1 7 T r R 2 15 C49 r1 lpc2s CR7 CR9 lc27 10 CR8 r CRIO C79 1g 7 1 CR5 jt3 L R PAUSE DETECTOR 8 lfJ 8 Rl69 20 Rl70 5 1 D l n T 2 __J OSI 15 I vi TJl 3 R 7 r 8 PHASE 1 H SI SELECT AUTO lfc28i CRII l 8 P4 45 C TO HT 2 P4 21 Y P4 22 L R OUT 5 CRI CR6 CRl4 CRl7 CR22 CR23 CR24 IN914 CR7 CRII CR26 1N4001...

Page 196: ...________________2AO J U S f _____ ____________________________ L R IN G P4 71 __ _ w_ _ i 19 P4 74 P 65 _ _ _ __ P4 66 19 P4 67 P4 68 P4 I 2 P 3 4 P4 77 78 P4 79 80 TJl 22 15 TJl 25 Rl74 IK 8 CR21 TJl 26 R 00 K 15 R72 IM R73 IK 15 t5 Ri Cj g16 CR24C82 I AUDIO OVERLO D _QS_3_ ED EEN CRl2 f lK CRl3 7 lK 15 I 15 C I __ 4 Ul5 Ut6 U21 TL074CN3 Ul8 Ul9 CD4053BE U12 LM340T 8 UII 7815 Ul7 TL072 U13 7915 U...

Page 197: ...INING PART OMIT FF OM 700 TO 1750 KHZ 4 Ql Q2 U310 3 CR3 CR4 MVl405 CRI CR2 HP2800 2 CAPACITANCE IN UF I RESISTJ NCE IN OHMS 25W 5 UNLESS OTHERWISE NOTED CR2 R4 470 CRI cs r R3 100 QI C2 02 50PF R6 IOOK C6 01 LI A6AI C7 I B C9 RS 100 r C8 I E6 I 0 R7 RF OUT 470 vco ES C BOARD FIGURE 8 10 SCHEMATIC vco 839 6202 026 8 45 8 46 ...

Page 198: ...APACITOR KHZ KHZ gTY FROM TO 500 699 1 700 1700 NONE 12 Cl HARRIS PART NUMBER QTY 494 0406 000 1 494 0405 000 1 494 0188 000 1 494 0238 000 1 494 0404 000 1 494 0403 000 1 494 0402 000 1 494 0401 000 1 494 0400 000 1 494 0399 000 1 494 0398 000 1 494 0397 000 494 0394 000 494 0393 000 1 494 0392 000 1 CAPACITANCE HARRIS PART NUMBER lOOPF 500 0759 000 NONE NONE FIGURE 8 11 STX lA FREQUENCY DETERMIN...

Page 199: ...659 24 1660 1700 22 C26 HARRIS PART NUMBER QTY 500 0755 000 l 500 0831 000 l 500 0830 000 l 500 0754 000 l 500 0787 000 l 500 0829 000 1 500 0828 000 1 500 0761 000 1 500 0827 000 1 500 0826 000 l 500 0825 000 l 500 0759 000 l 500 0824 000 l 500 0823 000 l 500 0822 000 1 500 0821 000 l 500 0820 000 1 500 0753 000 l 500 0819 000 1 500 0818 000 1 500 0817 000 1 500 0816 000 1 500 0815 000 1 500 0814...

Page 200: ...tions for the set up of the HARRIS STX IA AM STEREO EXCITER It includes pre stereo transmitter tune up STX IA transmitter interfacing and system alignment procedures All three sections should be read and understood before attempting installation 888 2174 001 A 1 A 2 WARNING Disconnect primary power prior to servicing ...

Page 201: ...e indication on the multimeter The yellow lock light should come on Place the STEREO MONO switch in AUTO and the VAR 90 switch in the 90 mode 3 Monitor the Q channel output with a scope If a 120Hz signal greater than 60 millivolts is present additional power supply filtering may be needed This unwanted PM noise should be reduced by improved filtering of the low voltage supplies to the low level RF...

Page 202: ...er Technical Manual and neutralization this ratio Refer of the AM Stereo A strong attempt should be made to achieve a ratio of 30dB or more for good stereo performance 20 og Q Volts Peak to Peak Ratio in dB I Volts Peak to Peak 20 Log 1 8 volts Peak to Peak 35 56 dB 30 millivolts Peak to Peak A 4 888 2174 002 WARNING Dtsconnect primary power prior to servicing ...

Page 203: ...ower If the transmitter does not have external drive capability a new RF input point must be created This can be done by breaking the RF drive between stages to introduce the external RF drive or by converting the oscillator to a buffer stage to accept external RF from the AM STEREO EXCITER The AM STEREO EXCITER is capable of 4 watts of RF output and can be driven into most any load impedance CARE...

Page 204: ...dicator terminal could be used to de energize the transmitter on a loss of drive from the AM STEREO EXCITER A relay will be needed to interface this terminal to the transmitter control circuit The opto isolator in this circuit is rated at 20 volts and will pass a maximum of 7 milliamps of current 2 3 The left and right audio inputs are also located at the rear of the AM STEREO EXCITER A 6 888 2174...

Page 205: ...l II 2 2 0 iii n 00 0 00 00 Cl I n N J 3 I Ql 0 0 Cl o 0 u I J INPUT FROM STERE O EXCIT ER Q 110 2W 150 l 2W 150 02 UF TO LOW I 2W_ II LEVEL T I VVv RF S TA GE VV 1 10 2W 1000 l 2W Figur e A 1 Isolati on Schema tic 829 9354 001 ...

Page 206: ...be taken from the RF output BNC connector All of these are labeled on the back panel 3 6 Audio inputs to the AM STEREO EXCITER are made at the L and L terminals for left channel audio and the R and Rterminals for right channel audio A ground terminal is provided at all audio connections inputs and outputs and should be used when possible 3 7 STEP 1 WARNING I ENSURE ALL POWER HAS BEEN REMOVED FROM ...

Page 207: ...I OSCILLOSCOPE COAX COAX TR ANS MITTER r RF INPu To I_ I TRANSMITTER 0 I JII IF OUT Jl5 RF OUT A 0 STEREO EXCITER STX IA 0 I I r I II I I 0 I Cl LL O LL ozo z wzw 0 0 _J _J 15 14 13 6 4 3 2 I I Q Q I O 0 _J I Cf 0 _J I Cf TRANSMITTER l I AUD IO o 1 l ___________ __________ INPUT I AUDIO GENERATbR FIGURE A 2 DIAGRAM TEST EQUIPMENT SETUP 839 6494 001 A 9 A 10 ...

Page 208: ...oscilloscope Increase the output of the square wave until the transmitter is modulated about 50 If the transmitter will not modulate the AUDIO OUTPUT LEVEL control R54 or R55 may be turned all the way down Adjust the audio output level control for about 50 square wave modulation e Increase the square wave frequency to the 3 5 kHz range Adjust the HIGH FREQUENCY EQUALIZATION CROSSOVER and GROUP DEL...

Page 209: ...o the left input of the STX lA at an am plitude large enough to cause 5 t lOdB of gain reduction as read on the STX lA multimeter with the function switch in the LIM GR position 3 17 Turn transmitter on Adjust the audio level potentiometer R54 or R55 to match the RF modulation to that of the IF as viewed on an oscillo scope The display should show close to 100 modulation on both waveforms after th...

Page 210: ...er R28 or R29 fine delay potentiometer R8 or R9 and crossover potentiometer R30 or R31 for maximum separation at lOkHz 3 27 STEP 7 3 28 Monitor separation and distortion and repeat steps 4 5 and 6 for best compromise of distortion and separation throughout this band Correct Display RF on top IF on bottom Incorrect Display RF on top IF on bottom Figure A 3 Correct and Incorrect Displays for STEP 3 ...

Page 211: ...iometers at the front of the Peak Limiter card A4 will be adjusted to improve separation They are labeled according to whether they will affect day or night pattern high or low frequencies or left or right channel The SB potentiometers should be adjusted at the same frequencies as the HF potentiometers lOkHz The LF potentiometers should be adjusted around 400Hz 3 35 The adjustment of these potenti...

Page 212: ...X lA AM STEREO EXCITER Dual Trace Oscilloscope Audio Signal Generator and Distortion Analyzer Digital Volt Meter Frequency Counter Spectrum Analyzer 888 2174 001 Tektronix 464 or equivalent Soundtek 1710A or equivalent Fluke 8020B or equivalent HP 52451 or equivalent Tektronix 715 or equivalent B 1 B 2 WARNING Disconnect primary power prior to servicing ...

Page 213: ...www SteamPoweredRadio Com ...

Page 214: ...closed position away from OPEN nomenclature on switch S2 0 so S3 switch position number 2 should be switched to closed position S3 1 so S3 switch position number 3 should be switched to OPEN position S4 0 so S3 switch position number 4 should be switched to closed position S5 S6 S7 and S8 1 so S3 switch positions number 5 6 7 and 8 should be switched to OPEN position The next four columns S4 thru ...

Page 215: ...www SteamPoweredRadio Com I ...

Page 216: ...2 0 0 0 0 0 0 I I 0 547 803 0 0 I 0 0 0 0 0 1 l 6 47 903 0 0 0 0 0 0 1 I 1 49 804 0 0 0 0 0 0 l 0 0 648 904 0 0 0 0 0 0 0 0 549 805 0 0 I c 0 0 1 0 1 6 49 905 0 0 0 0 0 0 0 I 550 806 0 0 0 0 0 0 1 1 0 650 906 0 0 1 1 0 0 0 0 I 0 551 807 0 0 0 0 0 0 1 1 1 6 1 907 0 0 I I 0 0 I 0 1 I 52 BOB 0 0 I 1 0 0 0 I 0 0 0 6 52 908 0 0 I 0 0 0 I 1 0 0 3 809 0 0 0 0 l 0 0 0 1 653 909 0 0 l 0 0 0 1 I 0 I 5 54 81...

Page 217: ... 0 848 1104 0 0 0 0 0 I 0 0 0 0 74 t 1005 0 0 0 I 0 I 849 110 5 0 0 0 0 0 I 0 0 0 I 7 50 1006 O 0 0 I I 0 850 I 106 0 0 0 0 0 I 0 0 I 0 751 1007 0 0 1 0 1 1 I I 8 i1 1107 0 1 0 0 0 0 1 0 0 1 I 7 2 1008 0 0 0 0 0 0 852 1108 0 1 0 0 0 0 1 0 1 0 0 75 S 1009 0 0 0 0 0 1 853 I 109 0 0 0 0 0 0 I 0 1 754 10 10 0 0 0 0 1 0 854 1110 0 0 0 1 0 0 I 0 7 5 5 1011 0 0 0 0 I I 5 1111 0 0 0 0 O 0 I I I 7 6 1012 0...

Page 218: ... 0 947 1203 0 0 0 0 0 0 I l 1047 1303 0 0 0 0 0 I 0 1 I 1 948 120 4 0 0 0 0 0 I 0 0 104B 1304 0 0 0 0 0 I 0 0 0 949 1205 0 0 0 0 0 I 0 1 1049 1305 0 I 0 I 0 0 0 1 0 0 I 9 iO 1206 0 0 0 0 0 1 I 0 10 0 1306 0 0 0 0 0 I I 0 I 0 9 il 1207 0 0 0 0 I 0 I 1 I 1051 1307 0 0 0 0 0 1 I 0 l 1 9 52 1208 0 0 0 0 1 I 0 0 0 IOS2 SOB 0 0 0 0 0 I I 0 0 9 13 1209 0 0 0 0 0 0 I 1053 13 09 0 0 0 0 0 1 1 0 1 9 54 1210...

Page 219: ...l 140 4 0 0 0 l l 0 0 1248 1504 1 0 I 0 0 0 0 0 1149 140 0 I 0 1 0 I 0 I 124 9 1505 0 0 0 0 0 0 I 1150 H06 0 1 0 0 I I I 0 1250 1 06 0 0 0 0 0 I 0 1151 1407 0 0 0 I 1 I 1 I I 1251 1507 0 1 0 0 0 0 1 I 1 l i2 1408 0 0 0 0 0 0 0 0 0 1252 1 8 0 0 0 0 I 0 0 1 1 5 1409 0 0 0 0 0 0 0 0 I 1253 1509 0 0 0 0 t 0 1 115 4 1410 0 0 Q 0 0 1 0 I 0 12 54 1 10 0 0 0 0 1 I 0 1 1 55 141 1 0 0 l 0 0 0 0 l I 12 1 Sll...

Page 220: ...446 1702 0 0 1 0 0 0 I 1 0 1347 160 0 0 0 1 0 0 0 0 1 I 1447 1703 0 1 0 1 0 0 0 1 1 1 1348 1604 0 0 0 l 0 0 0 0 0 1448 1704 0 I 0 I 0 0 l 0 0 0 13 49 1605 0 0 0 l 0 0 0 0 1 1449 170 5 0 0 0 0 l 0 0 1 13 50 1606 0 0 0 1 0 0 0 1 0 1450 1706 0 0 0 0 0 l 0 15 1 1607 0 0 0 1 0 0 0 I 1 1 1451 1707 0 0 0 0 0 I l 1352 1608 0 0 0 1 0 0 l 0 0 0 14 52 1708 0 0 0 0 I 0 0 1353 1609 0 0 0 I 0 0 1 0 0 1 14 53 17...

Page 221: ...7 1903 0 0 1 0 I 1 1 I 1 548 1804 0 0 0 0 0 I 0 0 1648 1904 0 0 0 0 0 0 1549 180 S 0 0 0 0 0 1 I 0 I 1649 1905 0 0 0 0 0 1 1 550 1806 0 0 0 0 0 1 I l 0 16 50 1906 0 I 0 0 0 I 0 1551 1807 0 0 0 0 0 I I I I 16 11 1907 0 0 0 0 I 1 1 52 1808 0 0 0 0 0 0 0 0 1652 1908 0 0 0 I 0 0 1553 1809 0 0 0 0 0 0 0 I 1653 1909 0 I 0 0 I 0 l 15 l 4 1810 0 0 0 0 0 0 1 0 16 54 1910 0 0 0 I J 0 1 5 1811 0 I 0 0 0 I 0 ...

Page 222: ...0 0 0 1721 1977 0 0 I 0 0 I 1722 197B 0 0 I 0 I 0 1723 1979 0 0 I 0 I I 1124 1980 0 0 1 I 1 I 0 0 172 1 1 81 0 0 I l l 0 l 1726 1982 0 0 I I I 1 0 1727 1993 0 0 I I I I 1 1 1728 1984 0 I 0 0 0 0 0 0 1729 1985 0 I 0 0 0 0 0 I 1730 l IBb 0 1 0 0 0 0 1 0 1731 1997 0 0 0 0 0 1 I 1732 1988 0 0 0 0 0 0 1733 1989 0 0 0 0 0 1 1734 1990 0 0 0 0 I 1 0 1735 1991 0 0 0 0 I I I 173b 1992 0 0 0 0 0 0 1737 1993 ...

Page 223: ...highpass allpass is removed from the exciter that a similar filter be incorporated in the audio processing pr eferabl y after average control and before peak control circuitry D 8 On the Peak Limiter Separation Corrector board second from the left in the STX IA a 27 ohm 1 4 watt resistor is added in series with RSS a 2 2 ohm resistor which sets attack time This will make the attack time of the lim...

Page 224: ...ak control on the processor Check the exciter to make sure the positive peaks are increasing and not the negative peaks Set the three position polarity control switch to the setting up or down center is automatic which gives greatest positive peaks D 11 Now that the mono modulation level is where desired remove the pro gram material and apply a l kHz tone to one channel of the processor Put the ex...

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