Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

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iMODULATION BY ELECTRON BEAMS 473circular motion and its amplitude of oscillation about the medianplane is shown by the vector r 2in Figure 3(b). Since
474 FREQUENCY MODULATION, Volume IE and the total current would lead E by 90 degrees, giving rise todecrease in the resonant frequency of the parallel circuit.If the electrons had emerged from the plates at position 6, thenthe total current would be I' as shown by the dashed vector in Figure3(c). In this case, the total current will have a resistive and reactivecomponent as indicated by (9).Calculation of Frequency ChangeIf a beam of electrons is to be used in the manner described aboveto control the resonant frequency of an oscillating system, the frequencyof the over-all system can be estimated by applying the Y ecalculated above to the equivalent circuit for the system, and calculatingthe frequency from conventional circuit theory.aLet the L C circuitshown in Figure 4 represent the equivalent circuit of the systembefore the beam is introduced. C is denned as the total equivalentcapacitance of the system, or more exactly,BEAML. U C, EZZZ2 VacFig. 4—Equivalent lumped circuit of resonant system.C V aEWvwhere E is the dielectric constant of the space, V ac is the radio-frequencyvoltage across the parallel planes between which the beammoves, and the integral is taken over the entire volume of the oscillatingsystem. C is then determined by the stored energy of the systemand the point at which the beam is introduced, for V ao depends, ingeneral, on the geometry of the system.To calculate the resonant frequency, writewhereB e + B c= (11)B e= electronic susceptance
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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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FREQUENCY MODULATION 61frequency in
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FREQUENCY MODULATION 53maximum perm
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FREQUENCY MODULATION 55Frequency Mo
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BAND WIDTH AND READABILITY INFREQUE
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BAND WIDTH AND READABILITY 59The re
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BAND WIDTH AND READABILITY 61Listen
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BAND WIDTH AND READABILITY 63The cu
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VARIATION OF BANDWIDTH WITH MODULAT
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VARIATION OF BANDWIDTH 67
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VARIATION OF BANDWIDTH0.0606 4998 7
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iVARIATION OF BANDWIDTH 71Example:
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ItVARIATION OF BANDWIDTH 73where 6
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whereVARIATION OF BANDWIDTHmEn=—
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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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DUPLEX TRANSMISSION OF FREQUENCY-MO
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USE OF SUBCARRIER FREQUENCY MODULAT
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Page 516 and 517: APPENDIX IFREQUENCY MODULATIONA Bib
Page 518 and 519: FREQUENCY MODULATION BIBLIOGRAPHY"F
Page 520 and 521: FM BIBLIOGRAPHY 511"Input Impedance
Page 522 and 523: APPENDIX IIFM STATION PLACEMENT AND
Page 524: STATION PLACEMENT AND FIELD SURVEY
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