Harris GATES FM-3H Manual Download Page 68

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Summary of Contents for GATES FM-3H

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Page 2: ...5 187 25 to 191 50 191 75 193 25 to 197 50 197 75 11 199 25 to 203 50 203 75 12 205 25 to 209 50 209 75 13 211 25 to 215 50 215 75 The frequency range for commercial FM broadcasting is 92 1 MC to 107...

Page 3: ...association to say I told you so Remember it is difficult to radiate harmonics if the equipment is built to suppress the harmonics and it is 4 In many instances interference may be caused by overload...

Page 4: ...I I 2 12 1 2 1 3...

Page 5: ...switch and discharge a lJ capacitors wi th the grouzding s k providet le2 Purpose of Book This irmtruction book has been prepared to assist ia the instal lation operation and maintenance of the Gates...

Page 6: ...to the customes plus transportation expenses the cost of wh5ch should form a portion of yous claim to the txanspoPfafion company A complete via zaL inspeatiou should be made of the 3q 21t lhtermiae t...

Page 7: ...ce InstaSSing the 4CX5OOOA is slnpSe cov ered in Section 2 4 Ms ndSi ng of thi s tube is The anode colln ec tor assembly E ecures with a cl amp to the tube and with a bolt to the plate line Coaxse fre...

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Page 9: ...es installation is somewhat dif erent E E2Ch Eilad KVC jr Therefore it is Rot possib1 e to give complete dei aiZLed informatiora on the cran mitten ductin g As a suggestion Only genezeal information 2...

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Page 11: ...and the most 0veral l efficient cendi The muitimeter switch SIO located on the meter panel will give an iildicatio i l of the amo rr t of drive to the grid of the PA tube This is a relative indicatio...

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Page 13: ...d GO possible arc avers and sh ort conductive ca c o s A good preventive maintenance schedule is always the beet assur ante for trouble free transmitter operation _ SECTION 4 CIRCUIT DESCRWTION The l...

Page 14: ...from over dissi l tti g in cast the PA has a 103s of plate voltag The 0 to 270 irGlt vari ab1 e iu ppl y for the I CjyE en voj tl c is also denivcd from the 2 KY centor tsp soli e IQ 5 3 I k contsol...

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Page 16: ...protective plexiglass cover The third meter reads plate valtage aud is loos ted on the Itiw potential side of the meter multiplLi er resistor The fourth meter is for indicating power output a nd YSviR...

Page 17: ...atio 3211 L IL0 VA cap 470 pf 1 KV Ceramic d i sc Can L oc3 uf 1 KV Ceramic dike _ 516 0054 000 914 1912 001 Var Cap 6 12 pf modif 516 0233 000 HV Cap 500 pf 30 KV ceramic 516 0205 000 WV Cap 500 pf 5...

Page 18: ...5 000 632 0547 002 632 cm0 co2 3 0545 m 635 0582 002 RZ R2 3 R4 540 0594 000 a5 9Nl l yK 0058 000 B6 X3tJR13rR 5 550 0067 000 R7 54 o 0070 000 R8 550 COP 9 000 R7 0 Rll R28 R5L Rl2 x14 Xl5 Rlii 542 02...

Page 19: ...604 obg6 000 604 0284 000 604 0283 000 6OLi 028G 000 Description VI 374 0016 000 v2 374 0081 000 404 oo c 000 XC42 I XPIy 2 ps 6 402 0015 000 Xl 4 c 5 402 0037 000 XF7 402 0021 000 XVI 404 xv2 404 60...

Page 20: ...the excgter and following amplifier stages When the TE 1 exciter is supplied in a Gates transmitter the pad is already installed If the exciter is supplied alone the pad can be installed at any conve...

Page 21: ...INSTRUCTION MANUAL FOR M 6425 FM EXCITER AS USED WITH M 6533 STEREO GENERATOR AND M 6507 SCA GENERATOR 5 I 4 888 0924 001 Gates Radio Company Quincy Illinois...

Page 22: ...ARTS LIST 9 SCHEMATICS DRAWINGS 842 4885 001 Functional Block Diagram 838 2064 001 Interconnecting Diagram 838 1955 001 Schematic Power Supply 838 2157 001 Schematic Modulated Oscillator 827 1630 001...

Page 23: ...f 400 Hz Stereo Sepnvation lft 35 dB min 30 to 15 000 Hz SubCarrier Suppression with or without modulation present 42 db min below 90 modulation Crosstalk main channel to sub channel or sub channel to...

Page 24: ...switch located on the power supply may be turned on Observe the output frequency on a Stan dard FM frequency monitor or by using a frequency counter Make sure that the AK ON OFF switch Sl is in the ON...

Page 25: ...ed on the front panel of the stereo generator Pilot gain pilot phase output level and L R gain Those adjustments located internally on the printed wiring board have a double underline underneath the d...

Page 26: ...derable drift of frequency If the cause of loss of heat can not be immediately determined modulated oscillator may be retuned to caxier frequency and operated temporarily without an oven heater Center...

Page 27: ...circuit This consists of tran sistors 1 and Q2 in the modulated oscillator unit This 5 circuit will oscillate anywhere in the standard FM broadcast band by adjustment of tuned transformer Tl Transist...

Page 28: ...se determined by the intermediate frequency as one pulse is genera ted for every complete cycle of the intermediate frequency A reference point for the error voltage is set with respect to chassis gro...

Page 29: ...are retouched sli htly for minimum LtR to L R crosstalk at 15 kHz lT ac complished by connecting L R and L R signals into the exciter input terminals and measuring output levels at the L R and LtR te...

Page 30: ...f the LtR input is adjusted to agree with that experienced by the L R circuitry This is accomplished by a time delay consisting of L3 through L6 and capacitor C29 and C30 Thus a composite stereo signa...

Page 31: ...F 50 V Cap 2 uF 200 V Diode lN2070 Zener Diode lN2767 Diode lN4720 Symbol No Gates Part No CR10 386 0047 000 CRll CR13 384 0134 000 CR12 386 0034 000 2 398 0012 000 398 0021000 F3 398 0019 000 Jl 610...

Page 32: ...p 000 cap 000 cap 000 cm 15 F 200 V 10 1 pF 500 WV 470 pF 200 V 10 lOOpF 200 v 10 50 uF 25 V 470 pF 1 kV 10 15 uF 25V Synhl No c20 c21 c22 Gates Part No 506 0087 000 516 0043 OOU 516 0082 000 Descript...

Page 33: ...0 0071 000 540 0045 000 540 0066 000 540 0049 000 Res lSKohm 1 2W 5 Res 8200ohm 1 2W 5 Res 680ohm 1 2W 5 Res 5100ohm 1 2W 5 Res lOOOobm 1 2W 5 Res lOOohm l ZW 5 Res 51 ohm 1W 5 Res 1800ohm 1 2W 5 Res...

Page 34: ...er i thru 16 380 380 0060 0042000 000 Transistor Transistor FET 2N697 Rl 540 1001000 Res 511Megohm 1 4W 5 R31 540 00 000 Res 6 8Kohm 1 2W 5 R33 540 0099000 Res 120Kohm 1 2W 5 R34 540 0066000 Res j lKo...

Page 35: ...4W 5 R79 552 0800000 Pot 500ohm 1W R80 540 0909000 Res 750ohm 1 4W 5 R81 540 0936000 Res 10Kohm 1 4W 5 Pot 50K ohm l 2 W Res 3300ohm 1 4W 5 Pot 5000ohm l 2 W Res 22K ohm l 4 W 5 Pot 5K ohm 1W Res 200o...

Page 36: ...ckwise turn is a rise in frequency if it is then you re practically home free Now turn the AFC unit off and note the direction the frequency goes If the frequency goes negative then turn AX back on an...

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Page 39: ...1 k d I I I I icH F I I I rlYz fA I I...

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Page 47: ...Figure 7 2 Floor of Transmitter Rear View Figure 7 3 RF Output Bah...

Page 48: ...E Figure 7 4 RF Cubicle...

Page 49: ...i L a Figure 7 5 Installation Drawing...

Page 50: ...TUN NG INCHES FWH TUNING BAR TO PA DEW FREWENCY MC PA COARSE Tuta FM36 3 KW FM TRANSIWTER FIG 7 6...

Page 51: ...R F S rEREO GEUERATOR PI6501 2 OPTiONAL SCA GENERATQK j R K 0LJrPlJ i 1 I I A R F r A 7 3 4cx 250 4cx 5000 i SCIWN PLA iE GRlD SCREEN PLATE I GR lD i3 AS SUPPLY HI VOLTAGE SLIPPLY I...

Page 52: ...PUT INPUT 50 OHMS 50 OHMS Y IPA IPA PI ATF PLATE TUNING PA OUTPUT OUTPUT L T LOADING I 4C X 5000 A IPA GRID TUNING OUTPUT 50 OHMS _ I r I IPA 8 PA SlMPilFlED XHEMAtlC DIAGRAM FM3G j F G 7 8 I 814 3175...

Page 53: ...55 50 45 40 0 5 I I 3 2 5 3 3 5 PO WFf2 OLITPLIT KW I A EFFICIENCY CURVE FM36 3KW FM ANSMITr R 814 3t73 001 F 5 7 9...

Page 54: ...pearance of Notch Filter at Second Harmonic At frequencies below resonance the I Stub appears as an inductance At frequencies above resonance tlie Stub appears as a capacity At the second harmonic fre...

Page 55: ...ge the value of the load of the 10 watt RF amplifier and could cause failure of one of both of the output transistors A change in the 3 dB isolation network is recommended to prevent the possibility o...

Page 56: ...the regulated power supply and RF amplifier may affect frequency stability Frequency correction required falls into one of three categories A Minor Frequency Error can be observed on scale on the fre...

Page 57: ...adjustment of the coarse frequency control should lower frequency and counterclockwise adjustment of this control should increase frequency If not see NOTE following Step 5 Turn the AFC function OFF F...

Page 58: ...load and adjust the modulated oscillator coarse tuning control for maximum exciter RF output Output of the TE 1 must be terminated at all times in a 50 ohm resistive load if not connected to the input...

Page 59: ...500 zooo 7500 IrDyQOO G ooo NOISE Distortio at 100 Elodul icm P Frequency Response Kith respect tq standard 75 upspre emphasis Curve T r 3 ds ___ 8 dB 0 dB 0 ClEi o d E A 0 a Q 2 cfs ro J dB 0 6 dB FM...

Page 60: ...the higher the efficiency the better 3 COMPUTING POWER OUTPUT Power output is computed either into the radiating antenna or a known dummy antenna In either case the resistance measurements are known Y...

Page 61: ...ly to the transmitter In the simplest form the antenna an the ground can be likened to tie two wires of an electric light circuit One is as important as the other Where the ground radials are bonded t...

Page 62: ...udio stage to the final audio stage Other outage conditions not affecting the transmitter are listed below for your checking Under certain conditions especially at higher altitudes the guy insulators...

Page 63: ...and stockholders When trouble comes he is under pressure He will do his best to correct the problem as fast as he can It is well to remember that electronic equipment has many circuits and many avenu...

Page 64: ...nt Voltnge 7 volts Pi n ix 6 i Div PL Plate Current g mps III u iscmLL Eous VSJR a Plate Dissipation p55 zitts a Piate Efficicmy do A 3 Phase Line Voltage 235 75 235 Volts 3 Phmc Line Current i Amps 3...

Page 65: ...0 DB DB 0 DB 0 DB 0 DB a DB A DB 003 DB 0 x DB d DB FX noise v ith rpspcct to 100 aodulation nt LOO Hz is 6 7 dB Input lcvc newssmy to modulate 100 at 400 Hz is f O dsm id Noise 5 0 dB With respect tg...

Page 66: ...is L dB belorJ 100 od tion 76 KHz suppression is 6 0 dB below lCC orrdulztion Crosstalk I R into L R or L R into I R is y 2 dB below 100 zodulction SEP JlirTIO i AT 100 ODUIATI N Frequency HZ 50 100 b...

Page 67: ...requency HZ Left Channel Right Chknel 5 SO 100 400 1000 3000 5000 8000 10 000 15 000 KEQUFXCYRESPONSEr ith Respect to Standard 5 Microsecond Pre eqhasis Curve Frequency HZ Left Channel ds Right Channe...

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