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Gates Radio Company FM- 20B, Instruction Book


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Summary of Contents for FM- 20B

Page 1: ......

Page 2: ...INSTRUCTION BOOK FOR FM 20B 20 KW Fri BRO JJC_ ST TR NSMITTER 6 22 61 I B 888 0619 001 G1tiS 1 LDI 0 C 112 Quincy Illinois...

Page 3: ...elaote Control Unit 1 Studio Unit RDC 10C 2 Remote Controlling the Gates FM 20 Maintenance Parts List dM o tkpnal Instruction Books 800 0184 002 Front View 800 0202 001 Rear View Drawings ieM9 001 813...

Page 4: ...oying pulse techniques 100 KC 75 KC considered 100 7odulation 600 ohms For 100 modulation 10 dbm 2 db Within 1 db of standard 75 microsecond pre emphasis curve or flat 1 db 50 to 15 000 cycles Whichev...

Page 5: ...lement 2 S5019 2 66 3206 16 1N2071 152 50KN7 Maximum kltitude Maximum A_ubient Si ze Weight 2 4 400A 1 6360 1 611q 5 1 6080 2 4CX10 000D 3 6201 7500 feet 45 C Width 84 less end bells 87 with end bells...

Page 6: ...pertains to the Power Amplifier The M 6095 Exciter used in this Transmitter employs a phase shift modulatpr using pulse timing techniques and may be adapted to single or dual channel Multiplexing on a...

Page 7: ...f the transmitter and is tuned to the customers frequency at the factory All power supplies in the FM 2013use silicon rectifiers All vol tage supplies in the Amplifier are separate and adjusted and op...

Page 8: ...delay relay and let it run for approximately three minutes after the trans mitter itself is shut down Metering of all important stages is accomplished with meters located on the sloping panels at the...

Page 9: ...tener one quarter turn using a screwdriver or coin and then lifting the meter panel up This will give access to meter terminals and wiring of the Reflectometer or Micro match switching section The con...

Page 10: ...the forced air coeling will become very inefficient and can causo damage to tubes and other co Iponents The duct work where the transmitter is used should not intro duce any back pressure UN2ACKING A...

Page 11: ...on The heavy components in the driver cabinet that have been removed for shipment should be re installed in their pro per pl ce before the first and second cabinets are bolted to gether It will bu not...

Page 12: ...transformer 2 Lt this time all low voltage supplies fan blowers and tube filnments should be operating This will be indicated by the lights on the control panels of the driver and the power amp lifie...

Page 13: ...output end and this loop can be used for monitoring It is also used for remote output metering for remote control operation Since the power contactors are non circuit breaker type and re quire a mome...

Page 14: ...ted DO NOT AT ANY TIME twist the tube into the socket Before applying any high voltage it is recommended that an ohmmeter check be made of all power supplies to see that they have not become grounded...

Page 15: ...itch S512 which is a test meter switch located on the bottom center of the driving amplifier panel in the grid position or extreme counterclockwise If the exciter and IPA are functioning properly abou...

Page 16: ...r output every time the amplifier operating characteristics are changed on initial tuning It is well to note here that the tuning of an FM Transmitter in the frequency range of 88 to 108 mes offers gr...

Page 17: ...ansmission line and antenna characteristics careful trim ling of the amplifier should be made These are the conditions which should be strived to achieve 1 Minimum drive to the driver and amplifier gr...

Page 18: ...dical change in grid current from the value given on the Factory Test Data Sheet The neutralizing controls for the driver have been brought out to the front panel of the driver to a special machined b...

Page 19: ...ts are retightened AMPLIFIER The amplifier also must be neutralized for proper operation Improper neutralization is indicated by possible self oscilla tion and great fluctuations of grid current as th...

Page 20: ...which perform three functions a It breaks the 240 volts a c Circuits to the high voltage contactors K503 and K805 in the driver and power amplifier control circuit b It applies 117 volts a c to the ti...

Page 21: ...ce of plate currents When S510 is in mid position the me ter M503 is reading total plate current of V301 and V302 The sum of plate currents as indicated by switching S510 either left or right of the m...

Page 22: ...on the transmitter will recycle and try to turn itself on The filament voltage on the amplifier will chane with output power This is because of power line loading The filament voltage during operation...

Page 23: ...cted to a 6 V d c source from one of the stepper positions on the re mote control unit All that is necessary to reset the over loads re Aotely is to dial through the position on the stepper relay to w...

Page 24: ...nd TB503 3 3 Conneqt the momentary on function to these two terminals for plate off 4 Connect two wires from remote unit to TB503 5 and TB503 6 for momentary plate on function 5 Place local Remote swi...

Page 25: ...necessary for this operation When inspection of air filters discloses dirt or foreign ma terial they should be disca Lded and replaced with new ones The type of filter used in the FM 20Bis a disposabl...

Page 26: ...or two of oil in the oil cups provided The exhaust fan in the driver and amp lifier have sealed bearings and require no lubrication This transmitter is a precision electrical device and as such should...

Page 27: ...5 ohm 10W 550 0029 000 Control 10K ohm 548 0004 000 Res 5 meg mater iaultiplier 542 0565 000 Res 100K ohm 190 W 550 0067 000 Control 10K ohm 600 0162 000 600 0302 000 600 0280 000 604 0086 000 604006...

Page 28: ...6 0204 000 Cap 100 mmfd 5000 V W 0311 520 0249 000 Cap Variable 20 uuf 0312 516 0233 000 Cap 500 mmfd 30 KV 0313 0314 Neut Padding Condenser Dot by Freq DC501 620 0034 000 Micro match 0 1200 W 50 ohm...

Page 29: ...shbutton Red 000 0 L Reset Pu_hbutton Switch 000 Toggle Switch D P D T 406 0052 000 406 0051 000 406 0053 000 Pilot Light Assembly Green Pilot Light Assembly Red Pilot Light Asse ably Amber CONTCTOR P...

Page 30: ...00K ohm 20W Filament Transformer Filament Transformer Plate Transformer Terminal Board Tie Point Tie Point Tube 5R4GYA Fuseholder Socket M 5675 AMPLIFIER 520 0004 000 520 0194 000 516 520 520 516 516...

Page 31: ...T01 1 L TIC RECYCLING UNIT Cl 524 0091 000 Cap 200 200 mfd 150 V CR1 384 0020 000 Silicon Rectifier Fl 398 0017 000 Fuse 1 amp 250 V Kl 574 0020 000 Plug in Relay Double Pole K2 574 0040 000 Relay 115...

Page 32: ...ohm 1 2W 10 Res 100 ohm 2W 10 Terminal Board Blower 1 1 2 H P 1750 FUN 3 ph 208 230V 60 cy C W Upblast Cap Part of tube socket Assy 0082 000 Cap 01 uf 1KV 0206 000 Cap 1000 uuf 7 5 KV 5769 001 Feedthr...

Page 33: ...92 000 Air Switch T601 472 0337 000 Transformer Filament T602 474 0050 000 Powerstat Two Ganged TB601 614 0104 000 Terminal Board TB604 614 0064 000 Terminal Board V601 V602 374 0077 000 Tube 4CX10 00...

Page 34: ...p 001 mfd 600 V Receptacle RF Choke Plug Control 1000 ohm Res 1K ohm 1 2W 10 Res 100 ohm 2W 10 Terminal Board PCMER CUBICLE RLPCTIFIER CONTROL A801 396 0062 000 B801 430 0012 000 CS01 510 0312 000 080...

Page 35: ...Res 100K ohm 160 W Meter Multiplier 8 megohm Res 1 ohm 25 W Adj Res 5K ohm 100 W Control 10K ohm Control 10K ohm Rheostat 1000 ohm 25 W 3KV 6500 V Switch ss y H V Grounding Switch Ass y Door Interloc...

Page 36: ...01 TB703 TB704 614 0062 000 TP701 614 0189 000 XA701 406 0052 000 XA702 1A703 1 XA704 XA705 XA706 XA707 1i 708 406 0053 000 406 0044 000 L 1 ZT SIDE 0802 C803 OB801 CB802 6 22 61 510 0317 000 522 0133...

Page 37: ...812 R813 542 0441 000 Res 1 ohm 50 W TB802 614 0096 000 Terminal Board TB803 Terminal Board Part of mech assy TB804 614 0095 000 Terminal Board TB806 614 0116 000 Terminal Board SCREEN RECTIFIER A S3E...

Page 38: ...REOTIFIER BORD LSSEMBLY 516 0054 000 Cap 001 uf 1 KV 384 0020 000 Silicon Rectifier 1N2071 o 6 22 61 12 FM 20 B...

Page 39: ...any pre determined VS R conditions This is done by adjusting the control Rll located on the deck below the meter panel on the power cabinet The same procedure is then used in adjusting power control R...

Page 40: ...d out until manually reset If the transmitter experiences one or two overloads and then clears itself the recycle unit will again be ready for three more complete recycles after approxi mately 15 seco...

Page 41: ...two switches and one push button which control the recycle unit are mounted on the 1KW driver control panel The operation of the push button acts as a manual reset It is a normally closed switch whic...

Page 42: ...ce output power to the desired level To tune the grid circuit place the negative probe of a volt meter into TP401 and ground the positive lead With drive connected to input receptJcle J401 tune 0401 g...

Page 43: ...e the possibility of oscillations and or parasitics the input circuit of the following stage should be properly coupled and matched to the 51 ohm coaxial line connected to the output of the 50 watt am...

Page 44: ...Grid Voltage 10 42 7 33 8 5 23 5 5j 20 3 5 15 Grid voltage measured at TP401 indicates voltage before applying screen and plate voltage Plt Pwr Input 107 watts 97 watts 75 watts 72 watts 61 watts Pit...

Page 45: ...n INSTRUCTION BOOK FOR THE M 6095 FM EXCITER o u I B 888 0648 001 August 1 1961 Gates Radio Company Quincy Illinois...

Page 46: ...istance of Frequency Multiplier Coils L101 Through L113 and Capacitor Values Across Them 7 Coupling Exciter To A Following Stage 8 Efficiency Calculations of V115 Stage 9 Typical DC Test Point Voltage...

Page 47: ...a sheet for the transmitter Maintenance 19 Trouble Shooting 19 26 No Carrier 20 Low Carrier 21 Intermittent Carrier 21 Oscillation 22 Carrier Off Frequency 22 High Distortion 23 Improper Frequency ite...

Page 48: ...106 826 7990 001 Typical Waveforms of Stages V107 thru V112 Tables and Charts Included Within Text of Book That are Helpful in Trouble Shooting DC Resistance of Frequency Multiplier Coils L101 thru L1...

Page 49: ...e techniques 100 Kc 100 Modulation equals 75 Kc 600 ohms cycles 10 dbm 2 db Within 1 db of standard 75 micro second pre emphasis curve or flat 1 db 50 to 15 000 cycles de pending on specifications of...

Page 50: ...Tube Complement o 3 6201 7 6AU6 1 645 3 6J6 1 12AX7 2 0A2 1 GZ34 5AR4 1 6080 1 6360 3 7025 2 X6095 Exciter...

Page 51: ...o place it on a bench All that is needed to operate the unit is an AC cord connected from TB101 78c8 to a 117 V AC outlet o u INSTuLLATION Generally when the exciter unit is received at the point of o...

Page 52: ...l milliammeter and a wire should be connected from TB101 6 to the negativo terminal of the milliammeter The final stage will draw about 65 milliamps when output power is 10 watts The external milliamm...

Page 53: ...1 The voltmeter should read 320 volts DC DAILY OPERATION It is considered good practice to arrange wiring and control circuits so that the crystal oven heater operates independ ently of the main power...

Page 54: ...ility of the Exciter at low frequencies The two modulator stages are driven in parallel from audio stages V116 and V117 V107 through V114 are frequency multiplier stages V107 through V111 are single e...

Page 55: ...should be obtained at TP118 this indicates sufficient driving power to final amplifier stage V115 If a defect is suspected but can not be spotted checking re sistance of the various tuning coils L101...

Page 56: ...impedance is to be suspected at the input of the following amplifier stage This will result in considerable loss of drive to the following stage and cause high standing waves to appear on the inter co...

Page 57: ...B101 5 6 An ammeter may be connected in series with this jumper to measure V115 plate current B 7 voltage has been previously set at 320 Power input to the plate circuit of V115 may be calculated from...

Page 58: ...3 watts Efficiency of V115 Stage is Power output Power input 10 18 3 54 8 These figures can be considered typical If the output power is not known an efficiency factor of 55 should be assumed o u 10 M...

Page 59: ...P110 72 TP111 68 TP112 133 TP113 46 RMS TP114 42 RMS TP115 113 TP116 140 TP117 227 TP118 6 Tp119 74 7 TP120 172 TP121 320 WITH DRIVE VOLTS 12 7 11 NO DRIVE VOLTS o 29 1 4 O 15 O 7 z33 o 50 34 30 1 95...

Page 60: ...pping off the output transmission line with a variable condenser in series with the coaxial line going to the monitor This has the dis advantage though of introducing a slight mismatch back into the t...

Page 61: ...h a good freguency standard and adjust C104 frequency adjust con trol until the frequency standard shows proper frequency Occasionally a crystal may be used that can not be set exactly to center frequ...

Page 62: ...d V117 may be checked by running test leads from TP120 and TP122 or TP123 to the input of the distortion analyzer Distortion as measured nt TP120 should be well below 5 nt any audio frequency If disto...

Page 63: ...ion range on a distortion analyzer A quick check to determine whether noise is causing an apparent high distortion reading is to remove all modulation from the input to the exciter or transmitter If t...

Page 64: ...centage of modulation at any modulating frequency Another method of measuring frequency response involves keeping the percentage of modulation constant as rend on the monitor To use this method the au...

Page 65: ...set a reference level on the distortion an alyzer Remove all modulation and read the FM noise on the appropriate scale FM noise of the exciter unit can be expec ted to approach 70 DB or better If FM n...

Page 66: ...t to occur this vibration will show up as high AM noise if the sampling loop is not securely mounted TYPICAL PROOF OF PERFORMANCE READINGS If the exciter unit has been shipped as an individual unit th...

Page 67: ...the factory test data sheet When the exciter is first received and placed into operation it is advisable to go over these test point voltages and re cord the reading obtained The test point voltages s...

Page 68: ...suggested NO CARRIER Of the many problems that can occur thi perhaps is the most serious and yet the easiest defect to find When this happens a tube has usually gone completely dead A comparison of te...

Page 69: ...01 and to wave form measurements on diagrams 826 g 7991 001 and 826 7990 001 in the back of the book may help Approximate RF voltage measure ments are also included at the end of this section LOW CARR...

Page 70: ...to that in this exciter unit A leaky capacitor or intermittent connection in the pulse circuitry can cause the frequency multiplier stages to fire off at their resonant frequency This oscillation wil...

Page 71: ...tortion high at low frequencies only 3 Distortion high at high frequencies only When distortion is high through the audio spectrum of 30 to 15 000 cycles the fault is apt to lie in the audio stages of...

Page 72: ...itude of about 25 to 30 volts peak to peak The leading edge should be linear with no rounding off When V106 is inserted and the bias properly set the waveform will be cut approximately in the middle h...

Page 73: ...irhit Hum from the power supply could also cause this efficulty Modulation at a 60 cycle rate can also be caused in the crystal circuit by induction from the crystal heater 24 NOISE AM noise is one fa...

Page 74: ...Pin 5 V109 29 0 V Pin 1 V110 4 7 V Pin 5 V110 29 0 V Pin 1 V111 6 6 V Pin 5 V111 34 0 V J101 TP113 47 V J102 TP114 51 V Pin 5 V112 6 2 V Pin 6 V112 6 4 V Pin 1 2 V112 21 0 V Pin 5 V113 9 0 V Pin 6 V1...

Page 75: ...0 506 516 506 516 516 502 516 516 506 0074 0292 000 0009 000 0173 000 oolq 000 0175 000 0172 000 0183 000 0252 000 0179 000 0016 000 000 Doscription Lamp 6 8 V 47 Cap 0 1 uf 200 V W D 0 Cap Variable 5...

Page 76: ...011 000 558 Fuse Slo blo 1 1 2 amp Fuse 1 4 amp 0016 000 Crystal Oven 6 3 V 600 G 612 0237 000 612 0232 000 913 913 913 913 913 913 913 492 492 1104 1105 1106 1107 1108 1109 1110 0025 0027 0024 1112 8...

Page 77: ...0 614 0054 000 6r2 0312 000 612 o311 000 370 0229 000 370 0028 000 370 0040 000 370 0082 000 374 0054 000 370 0116 000 370 0170 000 370 0133 000 370 0158 000 370 0001 000 Description Plug uo 88 u Adap...

Page 78: ...0016 000 Socket 8 pin XF101 XF102 402 0021 000 Fuseholder XHR 101 404 0068 000 Socket 8 pin XV101 XV102 XV103 XV104 XV105 XV106 XV115 XV116 XV107 XV108 XV109 XV110 XV111 XV113 XV114 XV117 XV120 Y101 4...

Page 79: ...commence from the date of invoice and continue in effect as to all notices alleging a defect covered by this warranty received by Gates Radio Company prior to the ex piration of the applicable warrant...

Page 80: ...be f o b Quincy Illinois or f o b the applicable Gates Radio Company shipping point 7 Gates Radio Company is not responsible for the loss of or damage to equipment during transportation or for injurie...

Page 81: ...111111111111i 10310111130111M 1111111111111111 11111 IMMIN 11111 111 111111nm maim zooms mown mallow um I 001 Mil 1111111111 11111 111110103 11111 1 110111111111111 1 1 11111 01 0011M00111M11111111111...

Page 82: ...4 65 LOAD AUDIO OSCILLATOR OSCILLOSCOPE DISTORTION METER e AUDIO OUTPUT OF MONITOR MON TRANSMITTER MONITOR INPUT GATES RADIO COMPANY QUINCY ILLINOIS TEST SETUP FOR F M DR el f3 CH 73EP ENG 73EP A 4165...

Page 83: ...LAeR 477 D SCOPE 4 1 l US NG FILAMENT VOLTAGE Ti PEAK To PEAK VOLT 4 T 6 3 VAC 7 5 VPP 3 vPP 72vPP 1 I 06 PiN 3 V 0 TP 03 TP 02 P N 7 V 03 DISCONNECTED 26VPP 1 PIN 7 V 06 fmENT5 WERE 7E Y7RON X SCOPE...

Page 84: ...THE WAVEFORM MEASUREMENTS SHOWN ON THIS DRAWING A MODEL 524AC TEXTRONIX SCOPE WAS USED AN ATTENUATOR PROBE WAS USED WHICH REDUCED CAPACITY FREQUENCY OF THE UNIT UNDER TEST WAS 88 1 MC IN EACH CASE THE...

Page 85: ...ZOO 17810 008...

Page 86: ...100 2020 008 reele2 7j cii Marc ag r 1 r e 11 9 11 m1 1 _ SSU SUC grwleurel 4ggge 14 raper iedu e...

Page 87: ...ion Grid Dissipation Filament voltage Filament current Plate Dissipation Min air flow cu ft min Inlet pressure inches of water C i ax Plate Jeal C STATUS CIEVELOPNENT PRODUCTION AIECN CUR _ PRO J ENC...

Page 88: ...ation 250 watts Grid Dissipation 75 watts eilament Voltage 7 5 volts 5 tdiament Current 15 amps Cooling To maintain tube seal temperature at 200 C at 50 C ambient air temerature Plate Dissipation Inch...

Page 89: ...I r _ _ __ ___ _ __ 1 H I f I I f 1 _ __ ___ I _ _ _ STATUS DEVELOPMENT PRODUCTION MCC 01 CHIC PROJ giLi doCi T V I 0 N V moo r vmslwv ww m HARA CH BY MTL 11 DATE _ DR 1 1 ENG DATE rynn I I_ r3 4 e_g...

Page 90: ...ei LIST OF PAR b QTY QTY QTY ITEM REFERENCE PT OR I FIN G N DESCRIPTION STATUS DEVELOPMENT PRODUCTION r INECN CHIC IN f iGCTION Dr CH BY iMTL DATE L DR BY i ENG oA Tr 1 re 7v1 T FIN TITLE NLES1 OTNERW...

Page 91: ...r tubes SHIELDING None TYPE OF CONNECTIONS Primary tud Terminals 3e condary Coil Studs HIPOT TEST ALL VOLTAGES ARE RMS COIL TO COIL 16 000 volts PRIMARY TO CORE AND CASE 4 000 volts SECONDARY TO CORE...

Page 92: ...TEMPERATURE RISE ADDITIONAL INFORMATION H V Filter 6500 volts D C 2ry type construction Sty c is limited physical size to be as small as the ratings will permit Open type construction may be used enti...

Page 93: ...S COIL TO COIL C P 0 volts PRIMARY TO CORE ANI CASE 20 U volts SECONDARY TO CORE ANI CASE UDC vc 2 ts TEMPERATURE RISE ADDITIONAL INFORMATION Dry type construction For tYPe 4CX5000A ulhps SimiL9r to E...

Page 94: ...OF CONNECTIONS Primary harrier strip snrl Studs HIPOT TEST ALL VOLTAGES ARE RMS COIL TO COIL 7560 Volts PRIMARY TO CORE AND CASE 2 000 V 11 SECONDARY TO CORE AND CASE 7 TEMPERATURE RISE 7olt 9 ADDITI...

Page 95: ...e 106 04 103 OTY OTY QTY 102 10 1 GR N O LIST OF PARTS OTY OTT ITE M REFERENCE PT I OP G N FIN DESCRIPTION I MATFRI 2 4 400A 2 4cx amo z moo kb9 rr_s 2 C KW _3000v ic71 4saav D e 1 Pz zE V OLTS pTL ST...

Page 96: ...8a NE57 51 Lie k n gi u 4 L eL _ A eorc Low mur e7 4c c A loroi ve _ ______ _ 4 1 1 friTCd4 55E 1 12iZt A1 50 9 3 3 49 14 P C 1 4 134 r 8 e sep 82 4 P de 15 7 a e 2141fR 5 TAT _ A t 4 I2F 67we 4 STATU...

Page 97: ...OF PARTS TV OTY OTT ITEM REFERENCE PT OR G N FIN DESCRIPTION MATERIAL AAAP 1 W T1 2 91 i T2 ir i i 1 1AMP 3 4 1 r t P T 1 TO M tit e4 kb 7 3 ri re re Df1 Z ftfe47 t ro 0 1 1 7 To bef Pi Ai _ e it To...

Page 98: ...CITY QTY ITEM FIN I DESCRIPTION MATERIAL TS O 3 P tIA 75201 3 T202 F 16X XF202 sZoaLo XF201 VeA BLK TS202 2 TS203 1 7 20 TS Z03 2 810C RED 7 0 VAC R11 7 O MC RED i 7203 F 7X BLK XV201 4 se4 q VA 2 C e...

Page 99: ...DZ QTY QTY QTY ITEM REFERENCE I PT OR G N LIST OF PARTS FIN DESCRIPTION MAIL STATUS DEVELOPMENT PRODUCTION Mg H CHI PROJ I i Nr telleTicr ov CH BY DATE DF By DATE MTL ENG I FIN TITLE 2 it UNLESS OTHER...

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