GENERAL RADIO COMPANY 1263-8 Operating Instructions Manual Download Page 22 | Manualshive

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Summary of Contents for 1263-8

Page 1: ...OPERATING INSTRUCTIONS TYPE 1263 8 AMPLITUDE REGULATING POWER SUPPLY GCN RAL RADIO COMP A NY D ...

Page 2: ...OPERATING INSTRUCTIONS TYPE 1263 B AMPLITUDE REGULATING POWER SUPPLY Form 1263 0110 D July 1962 GENERAL RADIO COMPANY WEST CONCORD MASSACHUSETTS USA ...

Page 3: ...Copyright 1961 by General Radio Company West Concord Massachusetts USA ...

Page 4: ...Figure 1 Panel view of1 ype 1263 IJ Amplitude Regulating Power Supply ...

Page 5: ...c modulation Recovery time after blanking is less than 2 msec with cw opera tion less than 200 msec with 1 kc square wave modulation Hum and Noise Peak residual hum and noise modulation is less than 0 3 on cw less than 3 with 1 kc square wave modulation Output Voltmeter Internal standardizing cir cuit is provided Accuracy after standard ization is better than 10 of indication when a correction is ...

Page 6: ...ing voltage as have General Radio Unit Os cillators There must also be available an output rectifier to supply a negative de potential proportional to the oscillator rf output In Figure 2 a Type 1263 B Amplitude Regulating Power Supply is shown with a Type 1750 A Sweep Drive driving a Type 1209 B Unit Oscillator The Type 1263 B Amplitude Regulating Power Supply was designed especially for use with...

Page 7: ... position POWER OFF toggle switch with pilot light Two position toggle switch Five position selector switch Recessed thumb set control Recessed thumb set control Continuous rotary control Continuous rotary control Recessed thumb set control CW 1 kc rLJ MOD ZERO CHECK CAL OPERATE UNREG 2 Function Turns power on or off Selects cw or 1 kc square wave modulation Permits output voltmeter to be checked ...

Page 8: ...ace and provide a zero reference base line on sweep display GATE Phone jack Modulation gate output for use with syn chronous demodulator system Three termi Connection for ac power through de nal plug tachable line cord 1 2 3 METER The OUTPUT VOLTAGE meter indicates theoutput volt age and is the means of checking the regulating action of the power sup ply The meter is an internal de vacuum tube vol...

Page 9: ...000 Me It can be plugged directly into the output con nector of General Radio Unit Oscillators and provides a matched source for 50 ohm coaxial cable The backresistance of the crystaldiode should exceed 40 000 ohms The ripple in the output of the rectifier must be less than 10 percent at frequencies above 0 5 Me to prevent overloading the con trol amplifier this condition is satisfied when a Type ...

Page 10: ...74 VQ Volt meter Detector and the characteristics are plotted on an x y plotter 1 3 5 SWEEP DRIVE The General Radio Type 1750 A Sweep Drive can be used with oscillators operating from the power supply to produce a sweeping frequency source with constant rf output over the sweep range This sweep drive also has a blanking voltage and provides a cathode ray oscilloscope deflection voltage synchronize...

Page 11: ...potential and applies a correction to the oscillator plate supply to minimize the difference The load re sistance presented to the output rectifier is 100 000 ohms A maximum of 300 volts at 30 milliamperes is available for the oscillator plate The de reference potential is adjustable from 0 to 2 5 volts which corre sponds to an rf output of 0 to 2 volts with the normal output rectifier This power ...

Page 12: ... oscillator Conversely a decrease in output produces an increase in plate current applied This closed circuit feedback system holds the output close to a preset level An external contactor shorts the reference potential to effect rf blanking With internal 1 kc square wave modulation the regulating action described above continues except that an RC filter is switched in to pass only the average de ...

Page 13: ...adio Unit Oscillators can be swept through their entire ranges in less than one half second with satisfactory regulation To ensure complete regulation with modu lation the entire ranges of the oscillators should not be swept in less than 10 seconds although good regulation can be obtained over most of the ranges with a sweep time as low as two seconds Section 3 INSTALLATION 3 1 CONNECTIONS Refer a...

Page 14: ...satisfactory operation without adjustment Output is 6 volts at 0 5 ampere with the nominal line supply voltage Heater current require ments for oscillators are met as follows a Types 1209 BL 1209 B and 1215 B 6 3 volts at 0 3 to 0 4 am pere b Type 1211 B 5 4 volts at 0 7 ampere satisfactory nominal re quirement is 6 volts at 0 75 ampere c Type 1218 A has internal heater rectifier Polarity of de su...

Page 15: ...upling is reduced the drop out point of the regulator will occur abruptly with no noticeable change in level down to this point if the system is operating properly If with normal plate supply the output from the oscillator is much greater than desired the control system may become unstable and break into oscillation This condition can easily be observed by the action of the output meter as the osc...

Page 16: ...ortions straight lines The neg ative voltage horizontal portion represents the oscillator output char acteristic and the positive portion the zero level With 1 kc internal modulation a similar pattern is obtained except that the horizontal portions are traced out by two bright spots connected by a vertical line The flatness of the path traced by the lower spot is the indication of flatness of the ...

Page 17: ...rnal1 kc square wave mod ulated output only a limited amount of amplitude modulating voltage may be applied to the BLANKING terminals when the Type 1263 B is set for cw Connect a blocking capacitor in series with the lead to the high red BLANKING terminal and set the output voltage to 1 volt At a 1 volt output the input impedance is about 5000 ohms and a 20 pJ blocking capacitor is suitable at fre...

Page 18: ...litude modulation characteristics of the Type 1263 B produces the maximum modulation that can be obtained without spoiling the output regulation Connect a blocking capacitor in series with the lead to the high red BLANKING terminal and set the output voltage to 1 volt At a 1 volt output the input impedance is about 5000 ohms and a 20 f 1 f blocking capacitor is suitable at frequencies above 20 cps...

Page 19: ... of the harmonic even if the amount of harmonic does not change Unfortunately this condition often exists in wide range high fre quency oscillators If the harmonic frequency approaches the resonant frequency of the voltmeter rectifier refer to paragraph 5 3 the error is magnified Above about 300 Me a low pass filter should be used between the oscillator output and the voltmeter rectifier to reduce...

Page 20: ...oth fundamental and har monics by such an arrangement the resulting display is often a truer picture of the transmission characteristics than could be obtained with nonmatching diode polarities For this reason the recommended matched detector Type 874 VQ is supplied with a diode of the same type as is used in the Type 874 VR 5 3 RECTIFIER FREQUENCY CHARACTERISTICS The resonant frequency of the Typ...

Page 21: ... Detector Section 6 SERVICE AND MAINTENANCE 6 1 GENERAL The two year warranty given with every General Radio instrument attests the quality of materials and workmanship in our products When difficulties do occur our service engineers will assist in any way pos sible In case of difficulties that cannot be eliminated by the use of these service instructions please write or phone our Service Departme...

Page 22: ...a 20 000 ohm per volt meter and a line voltage of 125 or 250 volts Turn R3 clockwise slowly and note that the voltage remains at least 45 volts before decreasing rapidly to zero and beyond checks margin of cutoff bias voltage If the above test is not satisfactory in terchange V1 and V3 and if necessary replace one or both tubes Re turn R2 to its counterclockwise limit If the voltage from TP1 to GN...

Page 23: ... as that indicated on the panel voltmeter An accurate vacuum tube voltmeter should be used The other internal control is R2 accessible from the top of the in strument No adjustment of this control is necessary since it is set at its counterclockwise limit and is provided only for making the test de scribed in paragraph 6 2 6 4 TABLE OF VOLTAGES AND RESISTANCES Tube Pin De Volts Res to Tube Pin De ...

Page 24: ...ING GlO G20 attenuators PANEL GA adjustable attenuator LOCKING PRLA PRL58A PRL8A PRL62A PRLT JR rotary joint RECESSED K coupling capacitor LlO L20 10 20 30 cm rigid BASIC AIR LINE 50 l CONNECTOR 874 B L30 air lines LA 33 58 em adjustable line BASIC LOCKING CONNECTOR 874 BL LKlO LK20 constant Z adjustable lines LR radiating line TYPE 874 ADAPTORS LT trombone constant Z line M component mount TO TYP...

Page 25: ...R23 300k 5 1 2 w REC 20BF 304B R75 91k 5 1 2 w REC 20BF 913B R24 lOOk 10 POSC 11 104C R76 lOk 5 l 2w REC 20BF l03B R25 lk 5 1 2 w REC 20BF 102B CAPACITORS R26 3 3M 5 1 2 w REC 20BF 335B R27 22 5 1 2 w REC 20BF 220B Cl lOfli 25dcwv COE 56 R28 100 5 1 2 w REC 20BF 101B C2 Olf f 10 COL 71 103C R29 1M 1 1 8 w REF 60 105A C3 Olf f 10 COL 71 103C R30 2 74M 1 1 2 w REF 70 2744A C4 0068f f 10 COM 1B 682C ...

Page 26: ...RE 41 RX12 2RE 1002 PLl PLUG RX9 2RE 41 RX13 2RE 1002 PL2 PLUG SOl SOCKET ll Sl SWITCH V4 5963 V6 6V6GT S2 SWITCH V5 12AX7 V7 OA2 S3 SWITCH Tl TRANSFORMER NOTE Resistances are in ohms except as otherwise indicated by k kilohms or M megohms Capacitances are in picofarads except as otherwise indi cated by tJf microfarads Type designations for resistors and capacitors are as follows POSC Potentiomete...

Page 27: ......

Page 28: ...F2 CIS PLI Cl9 S2 Tl SEE FIGURE II SOl SEE Figure 8 Bottom Interior View of the Type 1263 B Amplitude Regulating Power S pply FIGURE 10 ...

Page 29: ...SEE FIGURE 10 Figure 9 Top Interior View of the Type 1263 D Amplitude Regulating Power Supply SEE FIGURE 12 r SEE FIGURE II ...

Page 30: ...Figure 10 Etched Board Layout for the Type 1263 B WBOUN ...

Page 31: ...Figure 11 Etched Board Layout for the Type 1263 B 1 I I I 1 o I J u ...

Page 32: ...Figure 12 Etched Board Layout for the Type 1263 B ...

Page 33: ...186 lor A lro A ve lot Allo Coul ftlep o WHIIKMf 8 Ul CANADA 99 l loro Ph f foronro 1 0 1 H Ttfepllo11t CHo rr 6 211J REPAIR SERVICES EAST COAST G n url todHJ Compony S r t OtpOrlm M lolH A t W OIOt otd Mc u f P Oit lMt r on 9 4400 NfW YORK Get r f lodro Co pofl St YrU Otporf t tM Jrond A ot tittfl n lrdu r IJ N J ftltpJion NY WOrt ol 1722 N I WHitf l t J 3f 40 MI D WEST CuttoJ udrQ Compotly 1HYt ...

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