Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

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TURNSTILE ANTENNA 185Pig. 6—Details of one radiator element.layers are one-half wave apart and itcorresponding phase.is desired to feed these layers inThe concentric feed lines are shown laid out in a plane in Figure 8.It will be noted that the feed line on the left is one-half wave longerthan the feed line on the right. This insures the necessary push-pullFig. 7—Individual layers are connected together by means of two concentriclines which spiral around the pole. A simple matching network is also shown.
186 FREQUENCY MODULATION, Volume 1feed to each layer. Since each radiator has a resistance R, a resistanceof R ohms is present at each little end-seal. The half-wave connectinglines transfer impedance without conversion, so that the impedanceat point a on the right-hand line is that of the four sets in parallel,that is, R/4. In the general case, with n layers of radiators, theimpedance at point a would be R/n ohms. The input impedance of aline which is one-quarter wave in length and of characteristic impedanceZ is Z^/Z out, so the impedance at point b, looking up thePig. 8—A simplified layout of feed lines for four layers or less.right-hand line, is Z 2 /(R/n), or nZ 2 /R.An equal impedance is seen at point b looking into the left-handtransmission line. Since these two impedances are equal, the totalimpedance at point b is nZ 2 /2R. Now, if we choose the individualradiator resistance such thatR = nZ /2 (7)
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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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Page 187 and 188: A PRETUNED TURNSTILE ANTENNA*tByGeo
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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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