Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

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MODULATION BY ELECTRON BEAMS 497<strong>The</strong> main characteristics of this method of changing the frequencyare that the frequency is proportional to the total beam current andinversely proportional to the energy stored in the electromagnetic fieldwithin the cavity. A further examination of (92) and (93) shows thatwhen the transit angle a is not too small, the maximum frequency shiftAoi mi occurs when(l-fc)
6a—498 FREQUENCY MODULATION, Volume Iresonant with the oscillating electric field over that which would resultfor zero magnetic field.When k < 1, the electron current is inductive, i.e., lags behind theelectric field producing it, and gives rise to an increase in resonantfrequency of the system.When k > 1 the electron current is capacitive,i.e., leads the electric field, and produces a decrease in resonant frequency.It should be noted that the above behavior applies to cases wherethe beam is not limited by space-charge effects and the orbits of theelectrons are not large enough to strike the walls of the cavity. Anestimate of the effects of these factors can be made for any special case.Electron LoadingIn order to calculate the electronic loading, we note from (76)the imaginary part of K given by (88) is required. Thusthat«o 2 |/|\e\= Im K. (95)2Q U (.mVyyXYZ<strong>The</strong> value of the ImK isImK = vrt«V Z (' rrV V ZI COS 2 ( c ) I I COS 2 (o) + u> c )Z I 2v \ Z I 2v—j;~~~ +—:irt> Y \— («o — °>o)2r2;jy'^oVi I) — (">o +
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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 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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Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

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