Патент USA US2113225код для вставки
April 5, 1938. ì l. woLFF 2,113,225 'FREQUENCY CONTROLLED‘ELECTRONIC OSCILLATOR Filed Jul-y 25, 1936 NYëek ßnventor ßâgyf (Ittc'xneg Patented Apr. 5, 1938 . „22.113,35 UNITED sTMiz-sA PATENT ' iol'frflfÁczfa„ FREQUENCY ooNTnoLLED ELEc'rtaoNio osoILLAToR - Irving Wolff, Merchantville, N. J., assigner `to Radio Corporation of America, a corporation of Delaware Application July 25, 1936, Serial N0. 92,614 6 Claims. In its broad aspects, this invention relates to electronic oscillators. More specifically, the (Cl. 179-171) megacycles. invention is a carrier frequency -control for a modulated Ul electronic oscillator. y ' ' An electronic oscillator or magnetron may be used to generate ultra high frequency oscilla tory currents; i. e., currents of a frequency of thirty megacycles and upwards. If a magnetron oscillating at three thousand magacycles, by Way of example, is modulated, the modulation cur rents Will not only modulate the amplitude of the oscillations but will greatly vary the fre quency of the carrier current. This invention contemplates stabilizing the frequency of the carrier current of a> modulated magnetron’ oscil lator. ’ One of the objects o-f my invention is to pro vide means for stabilizing the frequency of an electronic oscillator. Another object is to -pro vide an oscillator for controlling the frequency of the carrier currents of a modulated mag netron oscillator. ` A further object is to provide means for pre venting a controlling oscillator from being af fected by the oscillator to be controlled. In the accompanying drawing, Fig. 1 repre sents a schematic illustration of my invention, and Fig. 2 is a circuit diagram of a modulated vmagnetron oscillator Whose carrier frequency is controlled. ` Referring to Fig. 1, a magnetron oscillator I is adjusted to establish a carrier frequency of 3000 megacycles, by Way of example. Signalling -or modulating currents are impressed on the oscillator I by a modulator 3. The effect of the modulation currents is to vary both the ampli tude and frequency ofthe carrier current. rI_‘lie frequency may be stabilized or controlled Aby im pressing` currents of carrier frequency, which are unmodulated, on the modulated oscillator. If the control currents of carrier frequency are impressed directly from the control oscillator 5 on the unmodulated oscillator I, the resulting frequency Will be determined by the relative re action of the two oscillators. 'I'hat is, the con trol oscillator 5 may control the oscillator I or be controlled by that oscillator. The interaction may be prevented by gener 50 ating currents of a frequency of 1500 mega cycles. The currents of 1500 megacycles fre quency are transferred to the oscillator I through a frequency doubler 'I. The frequency doubler, as the title implies, increases the control fre 55 quency currents from 1500 megacycles to 3000 The frequency doubler not only increases the frequency but it also prevents con trolled and controlling oscillators from inter acting. Thus the oscillator ’I is 'frequency con trolled or stabilized by the control oscillator 5. Modulation currents may now be impressed on the oscillator I and Will vary the amplitude of -5 oscillation Without varying the frequency of the carrier currents.' ’ ' ' ` ’ ' One embodiment of my invention is `.illustrated l io in Fig. 2.> 'I‘he'magnetronfoscillator’âl is com posed of Van evacuated envelope.' I I. ' A pair of anodesï I34 and a cathode 'I5 are suitably.v mount ed vWithin the envelope III. A magnetic ñeld, Whoselines of forceare substantiallyv parallel to (155 and surround the fcatho'de, is establishedby a solenoid I‘I', permanent Írnagnet, or the like. The solenoid I1 may beßenergized by a battery I9. The cathode I5 is heated' by a battery‘2l. The anodes I3Vare' connected to a resonant >trans mission line 23 »which terminates in a dipole antenna 25. The anode circuit is comprised of an anode battery 21, which is serially connected, through the secondary 29 of a Ymodulation trans former 3l and-radio frequency choke coil 33,@2 to la point intermediate lthe ends of the ydipole 25. The modulation is effected by a microphone 35 which is connected through a battery 31 to thev primary 39 of the modulation transform er 3|. ' ' " ‘ The circuit thus farydescribed is a conven tional Amodulated"'magnetronv oscillator 9. The control oscillator 4I,'_Which'operate`s at half the carrier frequency of themodulated oscillator 9, is comprised of an evacuated envelope 43 which « includes a cathode 45 and a pair of anodes 41.. 'The envelope is surrounded by a solenoid- 49 Which is energized by a battery, 5I. The cathode 45 is> energized'by- a ybattery 53. The anodes 4‘I are connected to a resonant transmission line 'T40 55.` An anode battery 5‘I is connected> from the cathode 45 through a radio frequency> choke coll 59 to the mid-point of the transmission line 55. The transmission line 55 is suitably coupled 45 to another transmission line 6I. The latter transmission line is terminated in a full wave rectifier 63, Whose output currents are of double the frequency of the input currents. vThe out put of the rectiñer is impressed on a pair of 50v enclosed quarter Wave lines 65, 61 between ter minals which offer a suitable impedance match for the full Wave rectifier, or frequency doubler. The quarter Wave lines 65, 61 are respectively connected to the transmission line 23 by leads 55 2 2,113,225 69, 1I which include "trombones” 13, 15 or the like, for tuning the connecting lines ‘S9-‘l I. The several transmission lines may be terminated in sections of line which offer suitable impedances. Inasmuch as constant frequency is desired, the oscillators and transmission lines should be care fully designed and constructed to minimize changes caused by the ambient temperature, vi bration, voltage variations, and the like. Thus I have described a modulated magnetron 10 oscillator. The carrier frequency currents gen erated by this oscillator are controlled. The con trolling oscillator creates unmodulated oscillatory currents which have half the frequency of the 15 modulated carrier currents. The frequency of the controlling oscillator currents is doubled by full Wave recti?iers or the like. The controlling currents of the frequency of the carrier are im pressed through suitable transmission lines on 20 the modulated magnetron oscillator to stabilize or control the frequency of the carrier currents a magnetron oscillator for generating carrier fre quency currents, means for impressing modulat ing currents on said oscillator, a second oscillator for generating currents of less than said carrier frequency, means for multiplying the frequency of said controlling currents to equal the carrier frequency, a pair of quarter wave resonant con centric lines for stabilizing said multiplied fre quency currents, means for impressing said mul tiplied frequency currents on said pair of con centric lines, and means for impressing said stabilized multiplied frequency currents on said magnetron oscillator to thereby control said car rier frequency currents. 4. An ultra high frequency signalling system 15 comprising, in combination, a magnetron oscilla tor for generating carrier frequency currents, means for modulating said carrier frequency cur rents with signal impulses, a second oscillator for generating controlling currents of half said carrier frequency, means for impressing currents and thereby prevent frequency modulation. from said second oscillator on a full Wave recti Although I have chosen magnetron oscillators to illustrate my invention, it should be under fier, a pair oi' enclosed quarter wave length lines resonant to the output currents from said recti fier for stabilizing the frequency of said rectifier currents, means for impressing said rectified cur rents on said quarter Wave length lines, and means for impressing the output currents thus 25 stood that Barkhausen-Kurz or any type of ultra high frequency oscillator‘may be used. Like Wise the controlling frequency may be made less than half of the carrier and multiplied by more than two to control the carrier frequency. 30 I claim: 1. An ultra high frequency system comprising an ultra high frequency oscillator for generating carrier frequency currents, means for impressing modulating currents on said oscillator, a second stabilized on a transmission line coupled to said magnetron oscillator for controlling the fre 5. The method of controlling the frequency of modulated ultra high frequency carrier cur rents by means of a concentric resonant line 35 oscillator for generating currents of less than which comprises generating an ultra high fre said carrier frequency, means for multiplying the frequency of said controlling current to equal the carrier frequency, a pair of resonant lines for stabilizing the frequency of said multiplied fre 40 quency currents, means for impressing said mul tiplied frequency currents on said pair of reso nant lines, and means for impressing said multi plied and stabilized frequency currents on said ultra high frequency oscillator to thereby control 45 said carrier frequency currents. 2. An ultra high frequency system comprising an ultra high frequency oscillator for generating carrier frequency currents, means for impressing quency carrier current, modulating said carrier modulating currents on said oscillator. a second oscillator for generating currents of -half said carrier frequency, means for doubling the fre quency of said controlling currents, a pair of quarter wave resonant lines for stabilizing the frequency of said doubled frequency currents, 55 means for impressing said doubled frequency cur rents on said pair of resonant lines, and means for impressing said doubled and stabilized fre quency currents on said ultra high frequency os cillator to thereby control said carrier frequency 60 currents. 3. An ultra high frequency system comprising 30 quency of said carrier currents. current, and generating an unmodulated con trolling current of a frequency equal to said car rier, stabilizing the frequency of said unmodu lated controlling current by applying said cur 40 rent to said concentric resonant line, and apply ing said frequency stabilized controlling current to said modulated ultra high frequency car rier to control the frequency of said carrier cur rents. 6. The method of controlling the frequency of modulated ultra high frequency carrier currents by means of a resonant line which comprises generating an ultra high frequency carrier cur rent, modulating said carrier current, generating an unmodulated controlling current of lower fre 50 quency than said carrier frequency, multiplying said lower frequency current until its frequency equals said carrier frequency, stabilizing the fre quency of the currents of said multiplied fre 55 quency by applying said multiplied frequency cur rents to said resonant line and impressing said multiplied and stabilized frequency current on said modulated ultra high frequency carrier to control the frequency of said carrier currents. IRVING WOLFF.