Страница 1: ...smitter TECHNICAL SPECI FICATIONS II INTRODUCTION 2 III INSTALLATION AND UNPACKING 3 IV GENERAL CIRCUIT DESCRIPTIONS 4 V OPERATION 11 VI CALIBRATION PROCEDURES 12 VII STANDARD PRE EMPHASIS CURVE 16 VIII FCC STANDARDS 17 IX PARTS LIST 17 X SCHEMATIC DIAGRAMS 23 ...
Страница 2: ...ccepted for use under part 73 of the FCC Rules and Regulations for monaural operation and with the addition of the 8 110 and or B 1l3 Stereo SCAassemblies this equipment is further type accepted for stereophonic and or SCA operation ...
Страница 3: ... Hz Loft or Right Channel DISTORTION 0 5 or Ius 30 15 000 Hz STEREO SEPARATION 39 dB or greater module only 35 dB through exciter 50 15000 Hz FM NOISE Greater than 65 dB below 100 modulo tion PILOT STABILITY RANGE 1 Hz over rated temperature range SUBCARRIER SUPP RESSION 55dB or greater 47 dB or greater less 15 kHz LP IiIters CROSSTALK 50 dB 30 5000 Hz 45 dB 5 10 kHz 40dB 10 1 5 kHz with fi lters ...
Страница 4: ... kHz and 67 kHz Modules for other subcarrier frequencies are avai lable on special order The individual SCA generators may be turned on or off remotely through rear chassis ter minals 150 microsecond preemphasis is standard 50 or 75 microsecond preemphasis is available on re quest Stereo Operation Stereo operation employs a plug in Stereo Generator Module in Position Oc 2 and a Dual Audio Module i...
Страница 5: ... easy removal of practically all components for service or routine inspection and maintenance Each module is easily removed by exerting a forward pull on the han dle provided Access to the rear of the cabinet is by removal of the screws securing the rear panel The top cover is removable for access to the meter switch and meter amplifier STEREO OPTI ON r DUAL I I AUDI O I IDELETE L R SeA 2 1 STERE ...
Страница 6: ...produce a frequency in the 8 8 to 10 8 ki 10Hertz range one ten thousandths of the specified operating frequency in the 88 to 108 MHz FM broadcast spectrum This divider output frequency is compared with a frequency in the 8 8 to 10 8 kHz range generated by dividing by 1000 the output frequency of a temperature controlled refer ence crysta I osc i Ilator dperati ng in the 8 8 to 10 8 MHz one tenth ...
Страница 7: ...pacitor C 6 50MHI 1 OSC 1 SCA COMPOSITE AFC I NPUT l FREQ VERNIER 1MH OUT 8 o lJ Q I will alter the response characteristics CAUTION Do not attempt to alter or adjust the 15 kHz low pass filter FL 1 The inductors are epoxy sealed and re quire no adjustment Module Circuit Descriptions Audio Module Monaural Verification of proper operation of this module is ac complished by connecting a 600 ohm bala...
Страница 8: ...VCI is AC coupled OUTPUT TO ALARM CONTROL l OOk l1 W to the oscillator through C9 This allows the external DC voltages to vary without affecting the quiescent condition of Q l Increasing the anode voltage with respect to cathode of the diode increases the capacit ance This change in capacitance is minimized by the series reactance of the 5 pf capacitor C9 coupling VVCI to the collector of Q 1 The ...
Страница 9: ...U T IN PUT FROM MODULATED OSC MODULE 7 5kHz LOW PASS FIL TER 0 7500Hz DETECTOR 01 02 OSC Q4 fo 900kHz 2 lJ Q I filter Thus the Q 6 Q 7 Q 8 and Q 9 circuitry oper ates as a DC loop fi Iter or integrator converting phase differentials at the phase comparator input into a DC output voltage This output voltage is fed through the lock switch SW l to the modulated oscillator fre q uency control input an...
Страница 10: ...the modu lated oscillator module is amplified by the field effect R F I NPUT APR OX 1 4W RF AMP Q1 RF AMP Q2 transistor Q 5 and fed to mixer Q 6 The 900 kHz intermediate frequency output of Q 6 is amplified by Q 7 Q 7 drives a 900 kHz band pass filter The fil ter provides a 900 kHz IF output signal to the diode detector D 6 D 7 If the operating frequency should shift by 100 kHz or more resulting i...
Страница 11: ...ase through the load thus preventing the Darlington combination Q 1 Q 2 from being turned on The two forward biased diodes D6 and D7 in series with the 5 6 volt zener diode Z 3 increase the refer ence voltage sufficiently to overcome the DC voltage loss of Q 1 Q 2 The DC output voltage should be 5V 10 as measured with a high quality DC volt meter The DC meter provided on the front ponel of the exc...
Страница 12: ...ut a segment of the audio input signal coming from the input terminal s of the module When Q 1 is turned on Q 2 is turned off When Q 1 is in its on state the input signal from terminals 9 and 10 is shunted to ground hence cannot reach the composite amplifier Q 3 During the same time inter val Q 2 is turned off and an input signal on terminals 13 14 can reach Q 3 250 ohm controls R 11 and R 12 in t...
Страница 13: ...nt to flow through the LED indicating lamp mounted external to the SCA module Thet 35 40 volt unregulated source voltage is filtered and regulated by trans istor Q 6 11173 lJ Q I V OPERATION Turning on Exciter Place the PA drive control located on the RF Power Amplifier module in its extreme counterclockwise posi tion Connect AC power to terminals TB 1 1 and 2 Connect a SO ohm load to the exciter ...
Страница 14: ...xciter The audio signal level feeding the exciter should be approxi mately 10dbm Position the flat Ipre emphasis switch located on the front of the module to the pre emphasi s position Adjust the audio level to the exciter for the desired percentage of modulation os indicated on an FCC type approved modulalion monitor Alternatively position the front panel meter switch in the audio posi tion and a...
Страница 15: ...ng the attenuation of the input signal neces sary to maintain a constant output voltage The at tenuation settings should follow closely the stan dard 75 mi crosecond pre empha sis curve as shown in section 73 3330f the FCC Rules and Regulations A reproduction of the standard pre emphasi s curve is included following this section 11173 o IJ Q I 5 If the measured response does not follow the pre scr...
Страница 16: ...step 2 unti I correct readings are obtained 9 5 Return the DC Meter switch to Epa and adjust the front paMI RF Drive control until a reading of 800 milliamperes is indicated The RF output ot this reading is between 8 and 12 watts 6 Observe the indication of RF output power on the wattmeter and adjust C 13 for maximum RF output 7 An R F output power of 10 watts shou Id be obtai ned with a total lpo...
Страница 17: ...directly behind the meter panel has two calibration adjustments 1 Remove all input audio signals 2 Place the meter select switch in the Audio position 3 Temporar iIy remove the stereo generator modu Ie if used 4 Adjust the DC balance control R 14 located on the meter amplifier card for zero reading on the meter 5 Re insert the stereo generator module if used and modulate the transmitter 100 with a...
Страница 18: ...NDARD PRE EMPHASIS CURVE Lrtf I P i I rj t Ilit 10 rr I TIME CONSTANT 75 MICROSECONDS i il I I j I S I d L 1 iHlfll II o I me I iLi I J l J r t rn L i r I f J L t r 4 III1111III 3 I IIPlIIIII 2 01 111111 1111 1 1111 1 11 1 Frequency Response Limits Shown by use of f J t t t 4 _ Solid and 01 LJashed Lines I r tjr r W j L r 1ttt W t tt o Lttr f F iE W4 i J I I 9 _ T fit Ii T U r Ij n I fHj 1 1i OJ 1...
Страница 19: ...into Main shall be greater than 40 dB below 90 modula tion When monaural main channel programming is used the SCA carrier must be between 20 74 kHz Total of all SCA subcarriets shall not exceed 30 modulation of carrier If engaged in stereo the SCA carrier frequency shall be between 53 to 75 kHz Total of subcarriers shall not exceed 10 modulation of the main carrier Crosstalk of the SCA subcarrier ...
Страница 20: ...film resistor R 11 12 20 24 400050 250 ohm trim pot R 46 401012 5K ohm pot R 47 401017 lOOK ohm pot C 3 4 5 670005 220 mf 10V tantalum capacitor C 7 600019 1000 mf 16V electrolytic cappcitor C 11 660026 5 25 pf variable capacitor C 15 670004 2 2 mf 20V tantalum capacitor C 18 670011 3 9 mf 35V 10 tantalum capacitor C 20 22 116049 6800 pf 33V polystyrene capacitor C 21 116104 12000 pf 33V polystyre...
Страница 21: ...004 930099 930100 930010 930011 9 30101 930102 930029 201065 201079 201081 230042 230007 660034 220005 220019 220007 173022 DESCR IPTION 5K ohm pot 1000 mf 16V electrolytic capacitor 001 mf 500V feed through capacitor 30 mf 25V 10 tantalum capacitor 18 pf N470 disc ceramic capacitor 18 mf 20V 10 tantalum capacitor 7 100 pf variable capacitor 2 2 mf 35V 10 tantalum capacitor 25 uH rf choke 50 MHz o...
Страница 22: ...diode 220007 SlR 13B 13V zener diode 062321 M 5054 1 mounted on front panel 700031 7S C 7 5 watt 12V crystal oven 090001 8 to 10 MHz crystal 480004 Single pole double throw switch MODULE It 6 ALARM AND CONTROL PIN 400043 220004 210008 220005 062321 470027 930080 930076 930083 090011 201050 201033 201022 201062 201079 220007 DESCRIPTION lOOK ohm tri m pot 1N542 diode 1N4006 diode 1N3604 diode MV505...
Страница 23: ...OWER SUPPLY PIN 512003 201024 201055 201033 201068 201039 210008 210009 220011 220012 220019 220018 DEseR IPTION 1 5K ohm 10 lW resistor 2N3053 tran sistor 2N4355 tran sistor 2N2102 transistor MJE2801 transistor 2N3055 transistor located on heat sink 1N4006 rectifier diode 1N4142 rectifier diode 24V 1 W Zener Diode 15V 1 W Zener Diode 5 6 V 1 W Zener Diode 6 8 V 1 W Zener Diode METER AMPLIFIER PIN...
Страница 24: ...2 STEREO GENERATOR optional PIN 559048 26 MODULE 2 or 3 SCA GENERATOR optional PIN 559049 27 MODULE 4 MODULATED OSCILLATOR PIN 554021 28 MODULE 5 REFERENCE OSCILLATOR PIN 553031 29 MODULE 6 ALARM AND CONTROL PIN 550161 30 MODULE 7 RF POWER AMPLIFIER PIN 552073 31 MODULE 8 POWER SUPPLY REGULATOR PIN 552074 32 METER AMPLIFIER PIN 551049 33 22 11 73 ...
Страница 25: ...III SINK I 0i4 SIS TrY 1 q L t lf PA RT OF OIOOULE I I SCHEIIATIC I _ AUDIO L _ _ _ _ _ _ J 1 illI I A bLOCK B P A VOLTS C RA CURRENT D lI ZVDC E SVOC F 15VOC S REF OSC H R F OUT I CONTROL I IlLTA6E J AUDIO IN II LJL J E S W I POWER BRN I I 1 I SC TII 2I PP A A iCA I INPUT PILOT CONTROL NOTES 11173 BLUe 10VAc CT T I Q IPOWER LIGHT n r TB I 1 P B 0 0 j Z I Ne NO COOl HASE LOCK ALARII R LAY L I IIOV...
Страница 26: ...ED ALL CAPACITORS IN MFO NOTES ALL RESISTORS 112 WATT 5 R27 330K R22 15K Q3 SE4010 IVDC f 3VDC Q4 2NJ569 CI3 220125V r p SEE OWG A 1997 FOR SCHEMA TIC C 1500pf IPRE I 1 R 28 10 K R25 lOOK RB 10K 1 R9 3010 I Q o TO MODULATED OSCILLATOR RI3 CI4 I 220125V RII 15K 12VOC Q2 SE4010 C8 22125V 8 910 t t1 MONAURAL AUDIO PIN 552072 JANUARY 17 1973 R26 220 D 1J Q I MODULE 1 MONAURAL AUDIO PIN 552072 24 ...
Страница 27: ...NT Clf pf r C QI SE4010 1500pf C5 R7 RB 10K I 10K 22125V I 10 0 101 0 R6 I R9 4 7K I 3010 I 10 0 1 I 1 I 1 I I I I I I I I I I I I I I I C20 10V J f J I JUUpT R27 R26 10K 10K 1 1 R2B 3010 1 ql2 N I lC 9 220 12 0 V Q2 SE4010 FL I 15kHz CIO RII LOW PASS w9Jo FiLTER RIO CII 4 7K 910pf 220 R31 lC23 220 rl IC2O 25V fL 2 RJO ISkl fz LOW PASS 820 r lLTER C25 910pf IX D lJ Q i RI5 15K l CI4 I 1000 16 V R3...
Страница 28: ...ANEL FUNC nON I UNI ESS OTHERWISE SPECIFIED ALL CAPACITORS IN MFD RJ7 Jb R 6 71 Q6 S 1010 R35 180K ZI IJV 4 15 0 1 CI 4 820p CIS CI 6 IOpr I i 2120V TANT RJ9 410K RJ8 56 Q7 SE4010 CIl 220pl Fl41 22K R40 2 2K R4 2 390 Rof3 of lK N01ISo ALL RESISTORS 112 WATT 5 10 10 74 J CI8 13 91 35 TAN T Q8 5E4010 RI9 R21 150 19 FL I z L LOW PASS FIL TER LC7 I 000116v 18 220 10K 17 I J R24 250 r LOCATED ON I I lP...
Страница 29: ...TlSo ALL RESISTORS liZ WATT 5 10 10 74 R6 I lK 01 E4002 R 7 rr R8 1 2 R9 2 5K I T L VFL Q2 R JJ 71 13 RII 1 RIO 10K RI4 560 3 lc e RI 330 IO ZSV R45 E2K RI2 7 2N2060 C4 147 25V 1 C5 330pf RJ7 4 lK RJ8 4 7K 05 IIIJ604 C7 RI9 I470 40V 4 7K C8 3JOpt t I Q3 2N2060 I I I L_J___J____C_J RJ5 I K RI5 58J80 2596 1 I I I _ _ J RJ7 JJO RJ6 47K R38 UK ZJ 5 8V CI8 l 22125 V CI7 rum C6 1 08 R39 15K R20 68380 25...
Страница 30: ...CHOKE RI6 6 8 5 V o 4 V p p Jln C4 0 01 L4 RFC I L5 RF CHOKE r l IC2 001 III 1 4 L7 RFC L9 RFC C22 001 I r lI C24 l 001 1 LlO RFC C29 1 01 R27 8 2K Q4 2N3B66 R26 47 06 MPS65J9 9VDC C25 001 R28 560 CJO o LI I Z2 IJV CJ5 220pf l C26 1 330 1 0V lJ I CJ8 2 pf TO PIN 18 RF OUT 1 2 IC 2 SN749 0 6V p p Q I 25V RJ2 p p 120 T 6 5 2VDC O T I IV T f N TTl T 2 LI5 I FC CJ9 1 2 2 TANT 4 J I MHz OUT TO MODULE 5...
Страница 31: ... 112WIITT 5 1o sv 1 svr9 ns 10kHz NOTES ALL CAPACI TORS IN MFD 4 74 C6 270pF 47p TEST POINT R8 2 7K IN542 100kHz COMPARATOR REF OSC LEVEL DETECTOR OUTPUT TO METER cs I I Q4 SE4001 R30 J 9K L CIO I 6BOI 25V LA B 0 1J Q T TO PHASE LOCK 8 POSITION ON METER RI4A 4 7 K L CI2 1 33DI 10V JVP P R32 3 9K RI4 10 CI3A CONTROL VOLTAGE GENERATOR Q6 Q 7 Q8 Q 9 L CI4 10kHZ 4 8VP P WV 1 005 TANT Q7 2N4355 RI7 820...
Страница 32: ... 1 FOR EXTERNAL 5 LOSS OF LOCK ALARM T MAX lA DC L _________________________________ 4 FL 2 C22 1 1 OFF FREQUENCY SENSITIVITY R3J lOOK L kHz BAND n J I lOIIIIIII o VV I CI9 90 900I HZ C21 07 RJ2 PASS 002 FILTER J 5VDC 06 IN542 RJS 68K 7V 28 5E4010 l K r RJI L C20 820 002 39K C2J 12 216JV R34 47K L3 C17 ISpf MANUAL r K2 010 2N2102 10pf RIS 22 CII 15pf R20 lOOK SEE Op t 2VOC U I R21 04 10K C A I I I...
Страница 33: ... tJ m a C5 L C4 0 0 1 4 71 50V _ TANT_ RI 10 0 S l f R2 15 C 3 005T L L4 L J C8 55 300 R9 15J C9 005 1 L 7 L8 L9 Q2 825 28 Lfl R4 SW I 47 I W CI3 7 00 CIS DI IN3604 1 R5 5 6K R7 2 7K J2 02 IN 3604 R6 50K RF OUT RF LEVf L CAL rn o W I J sa Jas ...
Страница 34: ...IA 01 3 014 Q6 LOCATED ON MODULE FRAME MJE2801 R9 6 15VDC REGULATEO 600MA L_ 22V 7 ORN f 82 IW NOm C4 68012SV R8 120 C5 680125V 2 UNLESS OTHERWISE SPECIf ED ALL CAPACITORS IN MFD ALL RESISTORS 112w 5 1o 14VAC 04 IN4006 05 SV SUPPLY RIO 680 8VOC Q2 2N30S 3 RII o Q i NV 20 5VDC REGULATED 27 W OUTPUT IN4006 1 1 1 TO METER 56K C6 10001ifiv AC INPUT j 14VAC AC INPUTe 019 IN4006 020 IN4006 C8 680125V C7...
Страница 35: ...1 VIm VI O o 0 r TI m 0 C 2 47 1 ZS V l C I 2 2 20 v ll INPUT TANT a 1 SE40IO CAL E4 I se C 3 4 7 i 3V tiC e S 331 e 51 K E E 7 2 2L 2 9 4 71 B 4 7C C 5 IOIG W ISV B INO 220 c IO G3 V Z I 13V e 13 220C 2 1q 1 1 D C BAL c D IreJOlTONIETEI S ...
Страница 36: ...ent parts for any properly maintained equipment or p rts that are de fective as to design materials or workmanship and that are re turned in accordance with McMartin s instructions to the Buyer At McMartin s sole di scretion the Buyer may be requested to re turn the defective part of equipment to McMartin FOB Omaha Nebraska Parts or equipment may be returned only with McMar tin s prior authorizati...
