Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

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A CATHODE-RAY FREQUENCY MODULATIONGENERATOR*!ByEOBERT E. SHELBYjVideo Operations Engineer,National Broadcasting Company, Inc.Summary— A device similar to a cathode ray tube is described whichmakes possible conversion from amplitude to phase shift modulation witha maximum phase shift of many times 360°. The modulating signal altersthe rotating electron stream in such a way as to produce phase changes inthe multi-piece anode current. A suitable network in the audio input effectsthe conversion from phase to frequency modulation.y wnjHE device herein described isa means of frequency- or phase-I modulating a carrier signal obtained from an oscillator of con-H- stant frequency and phase, such as a crystal-controlled oscillator.The majority of the known methods for generating frequency orphase modulation involve variation of the frequency or phase of themaster oscillator. There is one well-known method of producing phasemcdulation of a carrier obtained from a constant source which involvesthe addition of two voltages of the same constant frequency havinga constant phase difference of 90°, one voltage having constant amplitudeand the other varying in amplitude with the modulation signal.This method is limited to maximum phase shifts of the order of30°, which means that in order to obtain a large shift at the final carrierfrequency, it is necessary to employ frequency multiplication oflarge ratio. The method proposed here does not have this limitation.Theoretically it should give distortionless phase shift of many times360°.Structurally the device consists of an electron gun, two sets of electrostaticdeflection plates (or magnetic deflection coils), and a targetanode of special design, enclosed in an evacuated container of suitablesize and shape. A typical arrangement is shown schematically inFigure 1. It will be seen that the device illustrated is similar to aconventional cathode ray oscillograph tube. The only fundamental* Decimal Classification: R630.1.t Reprinted from Electronics, February, 1940.J Now Director of Television Engineering Operations, National BroadcastingCo., Inc., New York, N. Y.101
102 FREQUENCY MODULATION, Volume Idifference is the novel design of the target anode. Figure 2 illustratesone form which the target anode may have. It consists of two (ormore) metallic plates with curved edges, upon which the electronsfrom the electron gun impinge. In order to obtain phase modulationin which the angular shift is a linear function of the modulationamplitude the edges of the plates have a curvature given by the polarequationr =
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FREQUENCY MODULATIONVolume IEdited
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1000-3000 watt FM transmitter—194
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:FREQUENCY MODULATIONVolume ICONTEN
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FREQUENCY MODULATION NOISECHARACTER
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NOISE CHARACTERISTICS 3w na - (u—
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NOISE CHARACTERISTICS 6to the ratio
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NOISE CHARACTERISTICS 7where C = ca
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•NOISE CHARACTERISTICS 9nF naF in
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NOISE CHARACTERISTICS 112G-)F1 aJ.
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ecurrent impulse. It isNOISE CHARAC
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NOISE CHARACTERISTICS 15constant sh
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NOISE CHARACTERISTICS 17/ 1 d(t)- (
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NOISE CHARACTERISTICS 19modulation
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.NOISE CHARACTERISTICS 21vary direc
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NOISE CHARACTERISTICS 23and frequen
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1NOISE CHARACTERISTICS 25curves for
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NOISE CHARACTERISTICS 27not conveni
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NOISE CHARACTERISTICS 29lation rece
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NOISE CHARACTERISTICS 31theoretical
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NOISE CHARACTERISTICS 33sponding or
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NOISE CHARACTERISTICS 35modulation
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NOISE CHARACTERISTICS 37signal was
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NC1SE CHARACTERISTICS .39Since the
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NOISE CHARACTERISTICS 41tude modula
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NOISE CHARACTERISTICS 43frequency m
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phase modulation maintained constan
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FREQUENCY MODULATION 47band pass of
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FREQUENCY MODULATION 49IV.Interfere
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Page 68 and 69: BAND WIDTH AND READABILITY 59The re
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Page 74 and 75: VARIATION OF BANDWIDTH WITH MODULAT
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Page 78 and 79: VARIATION OF BANDWIDTH0.0606 4998 7
Page 80 and 81: iVARIATION OF BANDWIDTH 71Example:
Page 82 and 83: ItVARIATION OF BANDWIDTH 73where 6
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A PRETUNED TURNSTILE ANTENNA*tByGeo
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CHARACTERISTICS OF THE PYLON FM ANT
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IMPULSE NOISE IN F-M RECEPTIONSByVe
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THE RATIO DETECTOR*!ByStuart Wm. Se
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—PUSH-PULL FREQUENCY MODULATED CI
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APPENDIX IFREQUENCY MODULATIONA Bib
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FREQUENCY MODULATION BIBLIOGRAPHY"F
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FM BIBLIOGRAPHY 511"Input Impedance
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APPENDIX IIFM STATION PLACEMENT AND
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STATION PLACEMENT AND FIELD SURVEY
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Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

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