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Gates BC1G, Instructions For Installing And Operating

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Summary of Contents for BC1G

Page 1: ...GATES...

Page 2: ...INURUCTIONS FOR InaLLING AND OPERATING TH2 GATES TYEE BC1G 1000 250 WATT BROADCAST TRAI UIIITTER Gates Radio Company I B 888 0800 001 Quincy Illinois...

Page 3: ...eck of the wind ings may indicate that the transformer is defective whereas in reality this is a normal reading and the modulation transformer is performing normally In order to properly check this tr...

Page 4: ...ld be placed on the interlock switches for removing high operating voltages SWITCH TO SAFETY SAFETY FIRST 1hen workind on the transmitter disconnect the primary power at the building wall switch WARRA...

Page 5: ...ype of Crystal Used 2 1 4 First IPA 12BY7A 2 1 5 M5422 Oscillator Tuning Procedure 2 2 BC 1G Transmitter Description 2 2 1 Tute ___Lineup 2 2 2 BC 1G llrfayrem 1 t t er CIrcui try 2 3 Power Supplies 2...

Page 6: ...il L43 and Resistor R34 SECTION V TUNE UP PROCEDURE 250 WATTS SECTION VI HELPFUL OPERATIONAL INFORMATION 6 1 Frequency Adjustment 6 9 Transmitter Cleanliness 6 3 Relay Maintenance 6 4 Care of Printed...

Page 7: ...Location 813 7914 001 Wiring Diagram Remote Plate Voltage Control 837 8485 001 Wiring Diagram Studio Unit RDC 10C 837 9369 001 Wiring Diagram Transmitter Unit RDC 10C 826 9003 001 Interconnections us...

Page 8: ...o allow 1500 CPM of clean outside air under all circumstances AUDIO INPUT INPUT AUDIO IMPEDANCE FREQUENCY RESPONSE DI0TORTION CARRIER SIM RF OUTPUT IMPEDANCE DUMMY ANnNNA 16 DB 2 7Y1 k for 100 modulat...

Page 9: ......

Page 10: ...d radio frequency stages are built upon a panel and shelf assembly along with the control circuitry and the bias supply Mounted on the shelf portion of this assembly is the multi winding filament tran...

Page 11: ...d shelf assembly located on the right side of the cabinet behind the front door has the following controls 1 The crystal selector switch Sl and the two crystal trimmer capaoitors Cl and 02 The M5422 C...

Page 12: ...hich is commonly called the cathode assembly Tubes having single wire or thread type filaments supported by springs such as the 833A require more than normal care in handling These filament wires are...

Page 13: ...e efficient will be the radiating system A lack of complete grounding of the transmitting and audio equipment may cause trouble from stray RF getting into the audio and may cause unstable trans mitter...

Page 14: ...7A V2 the first IPA 2 1 2 TYPE OF OSCILLit20 i CIRCUIT The 12BY7A oscillator tube operates in a crystal controlled grid plate circuit also often referred to as a grounded plate Colpitts circuit Excita...

Page 15: ...amental Information that follows was obtained with the M5422 oscillator connected to its proper UP load and 30 feet of RG62 U cable con nected to the monitor terminal 6 with shield to ground or termin...

Page 16: ...t right anG les to the plane of the trimmer mounting screws qith the crystal selector switch turned to W1 crystal the frequency should be very close to zero if not adjust the trimmer FREQ j1 until fre...

Page 17: ...e modulated slightly this feature tends to increase the UF drive to the modu lated power amplifier on peaks of the modulation cycle this improves the distortion figure of the transmitter The RF driver...

Page 18: ...followers are operating satisfactorily High level Class B modulation is used in the BC 1G a pair of 833A tubes providing the means The grids of the modulators are excited by the two 807 cathode follow...

Page 19: ...ometers The bias potentiometers R1 and 112 indirectly vary the modulator bias by controlling the cathode follower bias and thus the current flow through the cathode follower resistors Rll and 2 12 The...

Page 20: ...e transformer T40 For 1000 watt operation this primary voltage is approximately 230 volts for 250 watt carrier output this primary voltage is dropped to 115 volts this develops around 1350 volts throu...

Page 21: ...MI...

Page 22: ...y open are now closed This operation adds resistor R14 in shunt with the 3600 ohm resistor in audio pad AT1 effectively reducing the audio input level to that required for 250 watt operation For 1000...

Page 23: ...too...

Page 24: ...A to operate the power change All other reote facilities are brought out to terminal boards located on the panel and shelf assembly These terminations are as follows TB2 9 10 Remote Plate Voltmeter TB...

Page 25: ...This procedure also allows the external transmitter wiring to enter the cabinet from practi cally any point underneath and be run to the entry holes provided in the base of the cabinet See Gates draw...

Page 26: ...ase smaller than 8 These wires can be brought in to the cabinet at the right hand rear corner as viewed from the front Make sure the wall switch is in the OFF position Connect the three pri mary wires...

Page 27: ...relay KlA which operates the 250 1000 watt carrier function 3 3 7 2 PLATE RIEOSTAT MOTOR AS DEHBLY The plate rheostat motor assembly 994 6326 001 has full mechani cal information supplied with the ki...

Page 28: ...1 Place switch Sl function switch on the front panel of the RDC 10C Studio Unit to position 2 The remote plate current meter will read plate current 2 Place switch 36 the plate On Off switch on the f...

Page 29: ...ections to the RDC 10C Transmitter Unit can be aade a TB1 30 in 13C 1G must connect to TB2 28 in i d C 10C 72 r _nsrlittor Unit 1 TB1A 15 in BC 1G connects to TB2 26 in RDC 10C Trans mitter Unit c TB1...

Page 30: ...G Transmitter must be connected to TB2 25 in the RDC 10C Transmitter Unit This function is on position 2 of the RDC 10C Studio Unit 3 3 7 7 REMOTE TOTER LIGHT INDICATION We must connect the remote tow...

Page 31: ...1 Place BC 1G Transmitter on air with 1000W carrier 2 Place BC 1G Transmitter on air with 250U carrier 3 With transmitter operating at 1000 watts to drop power to 250 W 4 With transmitter operating at...

Page 32: ...1i down position 3 3 8 4 1ITH TRAN 3HITTL A 250 1ATTS TO RAI 2 POJER Follow steps a b and c as described in paragraph 3 3 8 3 above d Operate RAISE LC_IU switch S4 momentarily to its RAISE up position...

Page 33: ...ing personnel that the Plate ON OFF switch is used as a IUSET function switch in its UP position as a PLAT2 OFF switch as marked in the DOqN position when the RDC 10C Studio Unit is working in conjunc...

Page 34: ...filaments should light It is well to note here that filament switch 341 is a push ON push OFF type It may have been in the ON position and if so the filaments would have energized at the time the wall...

Page 35: ......

Page 36: ...10 ma 4 1 1 CHECKING FILAILM VOIdAGE BIAS U1 PLY ANJ LOW VOLTAGE SUPrLY Remove the right hand side of the cabinet First we will check the filament voltage and its indication on the multimeter Using a...

Page 37: ...to what is indicated on the chart Again these turns will vary slightly under local installation conditions In our 1400 Kc tune up example we have 16 7 active turns for PA tank coil L40 8 active turns...

Page 38: ...Change the neutralizing capacitor setting by a small amount gradually decreasing capacity then re resonate the power amplifier noting the dip in the grid current As the correct neutralization point is...

Page 39: ...is the large final hP amplifier that puts out the power so we go about it carefully and methodi cally Your overload relays should protect the equipment if you do anything wrong but here we are dealing...

Page 40: ...is interlocked with the filaments when the filaments are de energized this shuts down the transmitter completely Remove the front perforated screen then look to see that all tubes are de energized No...

Page 41: ...to reset them if they are out of balance Slight touch up of these controls often helps in final distortion readings Actual perfect balance AP of static modulator currents is not mandatory In some cas...

Page 42: ...e of resistor R34 Turn transmitter off Adjust R34 variable tap as follows If carrier meter reads high it will be necessary to decrease the resistance of 1134 until the carrier meter is indicating corr...

Page 43: ...r 4 t...

Page 44: ...ately 2 2 amperes shown on the RF line meter The modulator will be energized The plate current to the power amplifier will approximate 260 280 ma at a plate voltage of 1250 volts The modulator plate c...

Page 45: ...r plate currents at both the 1000 watt and 250 watt carrier level By slight re adjustment of tnese two controls if necessary satisfactory modulator operation will be assured at the two output powers 3...

Page 46: ...zero The station could go on the air for tests with the assurance that the operating frequency will be somewhere within the range of the Frequency Adjust controls as mentioned above The external freq...

Page 47: ...ovide adequate ventilation Keep the fan blades clean free from dust and dirt Clean blades will remove more air The fan requires no lubrication 6 6 TEST EUIPMENT A broadcast station should own as a min...

Page 48: ...the associated equipment that will be used with this transmitter Because of this certain things must be left for the user of the equipment to do and certain problems solved In every instance tho use...

Page 49: ...000 Receptacle Li L2 L3 494 0033 000 492 0019 000 R F Choke 2 5 mh Variable Coil 105 200 uh R1 R6 540 0764 000 Res 100K ohm 2 W 10 R2 540 0740 000 Res 1000 ohm 2 W 10 R3 R9 R10 R11 540 0757 000 R4 540...

Page 50: ...00 Re 35K ohm 20W R3 R4 R5 540 0271 000 Res 3 ohm 1J 5 R6 R8 540 0724 000 Res 47 ohm 2W 10 Used on L2 and L3 R7 R9 540 0724 000 Res 47 ohm 2U 10Y R10 542 0147 000 Res 15K ohm 20W R11 R12 540 0291 000...

Page 51: ...4 000 Description Res 120K ohm 2W 10 Res 100K ohm 27 10 Res 470K ohm 2 1 10 Res 10K ohm 2i 10 Res 10K ohm 10W Res 47K ohm 2a 10 Res Res Res Res Res of Li 150K ohm 2 1 10 47 ohm 10 20 ohm la 8200 ohm 2...

Page 52: ...1 000 544 542 542 550 1367 0056 0057 0055 000 000 000 000 542 0053 000 552 0088 000 R35 R36 R37 540 0066 000 Si 52 Ti T2 T3 TB1 T131A TB2 602 0005 600 0187 472 0453 478 0142 472 0452 614 0123 Plug Pot...

Page 53: ...nk Det by Freq Cap Input and Output Loading Det by Freq Coil Variable PA Tank Coil Fixed Input Loading Coil Variable Output Loading Coil Mod Monitor Pick up Choke P A RF Meter RF Line Current 0 8 A RF...

Page 54: ...witch Toggle Local Remote SPDT Switch Filament Push on Push off red button with Neon Lamp 45 leads 6 amp Switch Reset N O momentary red button with Neon Lamp 45 leads Switch Plate Off N C momen tary w...

Page 55: ...I...

Page 56: ...937 9607 002 2800 V DC 384 0095 000 540 0214 000 516 0054 000 Alternate for 937 9607 002 384 0109 000 Descrirtion Diode 600V Fly 1 amp Qty 14 Res 1 megohm 1 2J 10 Qty 14 Cap Disc 1KV 001 10 Qty 14 60...

Page 57: ...M40 M43 M42 M41 800 0437 002 RI S40 1 SI S2 S41 La FIL ON OFF S42 RESET S43 PLATE OFF S44 LOW PWR S45 HIGH PWR R4 I BC I G M6245 1000 250 WATT BROADCAST TRANSMITTER...

Page 58: ...LOW VOLTAG7 7 SILICON ASSEMBLY L46 C47 T42 800 0437 003 DUMMY ANTENNA RI R6 HIGH VOLTe GE SILICON ASSEMEMES T40 R42 S46 S47 BeiG M6245 1000 250 WATT BROADCAST TRANSMITTER...

Page 59: ...T42 RI5 RI6 K6 r be Irettr11 7117 1 1r 800 0437 004 13 I 7 R F DRIVER AUDIO INPUT AND DRIVER ATI 12 TI L2 LI R3I FEEDBACK LADDER T81 TBI A 182 C48 R42 L47 T40 S46 S47 BCIG M6245 1000 250 WATT BROADCAS...

Page 60: ...r 4 4 5 40 ru vi 37 11175arlzel t e 800 0437 005 A 444 L40 L42 C40 R2 RI SI S40 S2 S4I S42 S43 S44 is S45 BC IG M6245...

Page 61: ......

Page 62: ...800 0437 007 RI THRU R6 600 V SILICON RECTIFIER 2800V SILICON RECTIFIER TWO HALF WAVE ASSEMPLIES T40 L45 C48 BCIG M6245 1000 250 WATT BROADCAST TRANSMITTER...

Page 63: ...800 0437 008 L40 P A 8334 S V40 V4I MOD 833A S V42 V43 SILICON BIAS RECTIFIER T1 K3 K2 KI FI F2 T40 BCIG M6245 1000 250 WATT BROADCAST TRANSMITTER...

Page 64: ...800 0437 009 RI5 R16 K6 T3 K7 R F DRIVER AUDIO INPUT AND DRIVER ATI T2 T1 L2 LI R3I FEEDBACK LADDER TBI TBI A TB2 BCIG M6245 1000 250 WATT BROADCAST TRANSMITTER...

Page 65: ...III am a immiumirmainiani ram a inmininew Wm am ureriamm en marini menummi IIIIII Ilium 111111M111111111 11111111111111111111 I IIIIM inunimmilMININIMIIELJENEll uniimimiummu 1111111111111113M11111 111...

Page 66: ...COCt D Nt EI gzE 0Uets iCy 12E Y7 A 7 205 V xx R7 2w 8 ICS C7 0 fl1 1 17 R2 Ps Anne 1000 2W R5 R8 vvvv n IGK 10K 2W 2w 13 Rh 27K 2W RI4 C11 FIL FIL X ni l METER B 138 6 CIO 100 C9 140 P 308 DE EACK VI...

Page 67: ...olts Neg 70 DC powers Filament Volts 6 3 AC Modulators V42 V43 833A s 1000 W 250 W Plate Volts 2600 DC 1300 DC Plate Current Static 40 MA en 25 MA ea Bias Volts 65 70 DC 35 DC Filament Volts 10 AC 10...

Page 68: ...on hot side of resistor R12 Neg 280 V Variable tap on resistor R12 Neg 45 V Same for both powers Intermediate Plate Supply Output of supply measured at L46 terminal 1 600 625 V DC Same for both power...

Page 69: ......

Page 70: ...co to N t i L A P A TANK COIL L40 IND APPROX 0 c i o g o c l ttisc41 o o o c_i 0 r c i o g s o o o r 4 C1 1 e ria I I co 14 LO g 14 r 4 Ln re e CI CM LP 0 N tr I 41 r CM e r 1 n c a co r 1 e 4 e 4 Pr...

Page 71: ..._ 5 11TC11 MOD e l MOD ea WIRE 93 OTBE 22 WIRE l03 CJIRE 153 Li E P 104 ZJIKE 91 alll E 93 OTBZ 22 MOD e MOD ea WIRMG PI AGRAM EXTERNAL CONNECTIONS MOD SEL F ST TWO T 9 VS 01Y D O91 139 6 9i 8CIG IK1...

Page 72: ...T82 28 Te1 30 TE32 8 0 T82 26 TBIR 15 r z TB 6 it ce 4r zz l I A 5 4 8 7 GV D 0 2 1 TB2 25 o TE32 16 rei zo TEI 26 SUPPLEMENTAL RELAY CONNECTIONS HIGH LOW POWER FUNCTION ac G AND RDCIOC REMOTE CONTRO...

Page 73: ...673 967 oe 1 e A 2 VOLES G 32 TAP 2 1 4 4 STATL 4 57 e7e2E 14 EA TAL et LAY X 4 zacyiTioN KW A 14 XM TX 44 624 5 50 150 0 a 0 1C7 0 4 11...

Page 74: ...oc 7 RALLS rr V Nc 1 1 eurrep L Rouai GAID srob Bi 15 V PC Tu hYG r R _ S a _ _ _ c t _ _ J o Ki o rz 1 fffiEo ri 7 17 2 _EL WII 11 DOGIMAI kd gere piATE roo 966 cavneoL Al 42 Veic 00y2ro re 9ms CIOC...

Page 75: ...ea V200 AMP C4 R it 10 PO S ITIONING RIO si 18 OESCR MTIG ibl TSRIAL FRONT PANEL 4 5 N 1 81 I ne g0 Tel 5 10 7 _ 7 00 TBI 9 TS 3 E L r lq NI 1 R I a M1 N A R1T Fos ill RIG 4 s I RI4 2 c 0 SOK I el MI...

Page 76: ...CR4 T 40 MVO C4 tta r 0 Su c p in 3 I I e I L 3 1 4 o ree 21 8 0 T82 Z Ki I 2A 1 00 T82 2 90 1E92 Z TO t 3 rez z oz i I r OFF ARM OPENS CONTACTS IN OFF POSITION 7 0 7152 q 90 r 00 7 32 13 781 3 RS i r...

Page 77: ...2 Blk Tel 5 11 10 rs 12 Elk TB1 6 12 Kl _D 12 Blk TB1 8 Tie 27 12 Rlk Kl F 14 K2 A 12 Blk K3 D 15 K3 D 12_ ink TB1 9 le K2 P 12 Blk TB1 10 17 K3 12 ica_k TB2 26 18 K2 D 12 Blk K3 B 19 TB2 28 12 Blk K1...

Page 78: ...38 K2 2 _le 16 Brown _ I i3 K3 E 39 TB1A 8 16 Brown K2 F 40 K1 A 16_ Brown TB1 13 41 TB2 1 16 Brown TB1 14 42 TB2 2 16 Brown K1 1 coLLI 43 TB1 15 16 Rrnwn K1 1 enin 2 coil 2 44 TB1 1 ez IL__ 2zown Kl...

Page 79: ...wn T1 3 64 TB1 12 16 Brown Ti 1 6 Sil AC 1 66 Sil AC 1ELEzuwa_ 1 R mum Ti 1 68 M111 11111 111 1 1111M11111 11111 1111 111 11 IIIIMPIIM INII K TB1 1 16 Brown K4 B e de 4 16 Brown K1 B 16 Brown K9 2 TB1...

Page 80: ...15 R16 1 9E Pi7 P18 R19 1 16 Brown R15 R16 2 97 R17 R18 R19 2 16 Brown TB2 24 98 K7 1 16 Brown TB2 25 99 K7 2 16 Brown R29 1 100 R29 R30 2 16 Brown Gnd Nr T2 101 K3 J 16 Brown TB1A 13 10 R17 Rle 2 16...

Page 81: ...e 1 NM...

Page 82: ...2 20 White TB2 11 124 R36 2 20 Uhitfl mil2 12 125 TB2 13 Gnd 20 White Gnd Nr T2 121 s2 Back 7 wafer 20 White TB1A 1 127 S2 Front 7 Wafer 20 lelait e TB1A 2 12A SP iront 4 Wafer 20 White Tie Pt 1 3 12...

Page 83: ...Pl P2 2 16 Brown R3 2 149 TB1A 11 16 Brown TB 28 16 Brown K G Gnd 2 152 212 2 16 Rrnwn Gnd Nr Ti 153 R32 1 16 Brown Si 1 154 TB2 29 16 Brown Gnd Nr Ti F B Ladde Nr Ti 1 6 al e 16 Brown Aud 3 157 a e 3...

Page 84: ...ard 20 White R28 2 169 R31 3 20 White R36 170 K7 1 16 Brown R O 171 K7 2 1 Urolein R10 2 172 R31 2 20 White R37 1 173 R30 2 20 White R31 2 4 e A O R 0 1 R30 1 2 QIihiU__ 2 Jum er T lA T2 3 18Buss 20 1...

Page 85: ...TR2 _10_ 1 11 TB42 14 16 Brown TB2 1_7 12 TR42 16 16 Bron TB1A 11 13 TR42 17 tel Brown TB1A 8 LB24 2______18 16 Rrnwn TR1A 9 15 TB2 20 16_ Brown TB2 18 15 L43 Var Tap Hot Lead iiG58 U TB1A 12 16 i RG...

Page 86: ...T41 arn nri LE 3 4 21I 39 TR 23 lb Brown 40 TB2 19 1F Rrnwn m41 9 7 41 TE 2 14 Blue Z43 4 2 42 TB1 1 14 Blue R43 3 43 T40 4 14 RU1P Main nhirlet GrQ 44 _L46 1 16 Brown C47 Lad 1 44 5 nu7 1 16 Brown m...

Page 87: ...BnArd reirked Red Turbo I Marked 68 tt t Rad Turbo 145 2 69 L45 1 Red Turbo C48 1 70 L45 1 Red Turbo R42 1 71 048 1 Red Turbo T41 2 72 T41 4 Pet murba C 4 9 73 L47 i 1 Rea Turhn T41 5 L47 2 Red Turbo...

Page 88: ...ENT TERMINAL Rmt Fl Volt R4 Res ssy 1 Rd Trh PLA 625V Sil In Cable 4 a5 TILE _ 2 4 1 Rrnwn AW 4 937 9645 1 86 T40 1 121 1eu f__2219 R7 T4Q 2 12 _JD ank TR1 lo Q6 _ ffl_ 111 iluzper_12 _Black_ Vill Fil...

Page 89: ...3 jes 4 7 Ft2 0 e o 7 e foor REOf le UWE Jies MD 1_ er Oar Tkoms NO i la m felmort lase7 y roza InROE s T62 _ sj c fM Oa Kb HO O e N C Orti2 S It22 13 rE Tine o te i e 4 Co 1 elfan m wp Aloe wetf F rz...

Page 90: ...813 792 4 001 1 36 16 I g 3 28 1 6 22 2 DIA ACCESS HOLES 23 10 32 H 32 3 1 3 15 2 I 4 25 2 32 26 33j 6 2 x 4 BASE FRAME 31 3 32 7 26 32...

Page 91: ...813 7G29 001 K ee m e FRoer eF iFeigy COes r C Cii Al 12 _ rfkIS a iraie 41 9 4 M M O e eemegley Po cti6 1 O 7 O G _ 49 19 e 9A1 peitt4PAy etGeeeeiPrz 51 813 7e2 9 001...

Page 92: ...RI Ere g e5 2 P 4 2 7 51R 1 Co ele 3 5 7 NEG oFet IT neri f e le e 13 0 2 7 l cW 93 W Fcs 13PC WfiF Ele Fuerfirk EST e ea 41 13 91VEL CEerel z4e 5 de TCN gece et W e 5 to rc 11 Fecwr A lexr 7 FAivez...

Page 93: ...CTOR DO 0 N 0 08 COIL LooKING AT DE K NOT oa E D F FRONT OF CONTACToR D d FRONT CONTACTS L USED AN 4 1 I TYPE FPR 44 U STATUS TOLERANCES UNLESS OTHERWISE SPECIFIED DEVELOPMENT _____ PRODUCTION FRACTIO...

Page 94: ...7 10 sAl t 4 4 rE E ya TS 111 cc El 2 1 el t our 1 ur re n 1 C44 L 111 1 I ne ku ji I 4 e fa_ I II I I LI ater R 3 _ jK K2 T1344 9 NI Se 34 4 T44 41 pG0 14OM 1 f 4_51 Re C r re N R ro so 0 4 7 j menu...

Page 95: ...2 Ra Si a iLa 1111u 1 114 a 1 Ise 0 la RI 3 14 4 11 atS4 4 at 6 1 7 i au otrr FZ SJJ a TRI 117 S el REAR DOOR I OCT LOW Vat VASE 1 1 4 0 44 C raea O Tild 111 AZ TILE 0 4714071 0044F RNEARYORE 1 1 73Z...

Page 96: ...GATES...

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