Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

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MODULATION BY ELECTRON BEAMS 499tional to the total beam current and inversely proportional to the cavityvolume and the square of the resonant frequency.<strong>The</strong> maximum loadingoccurs when w = (1 — k) a = 0. For a transit angle differentfrom zero this occurs at k = 1, i.e., u> c= , which means that theelectron circular motion is exactly in resonance with the electric field.As seen from Figure 13, Ao> is zero at this point, so that the electroncurrent is entirely a resistive component.When the transit angle is not too small the loading is essentiallyzero atW = (1 — k) a = Sir (99)since T(w) is zero at this point and T(u) is very small. In this casewe find that minimum loading occurs at (1 — k) a = Zir, instead of 2-n-
500 FREQUENCY MODULATION, Volume IAPPENDIXFringe-Field EffectIn general, the problem of estimating the effect of the fringe fielddepends on the geometry of the specific system. If, however, thetransit time in the fringe field is small, the effects can be approximatedas follows. 1Consider a charge q emerging from between a pair of parallelplaneelectrodes, and let the charge be displaced a distance x from themedian plane.<strong>The</strong> induced charge on one plane isQdand that on the other is
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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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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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