Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

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:jSERVICE RANGE OF FREQUENCY MODULATION 221ExampleThe curves of Figures 7, 8, 9, and 10 have been calculated for thefollowing assumed transmission conditions for a high-fidelity broadcastsystemTransmitting antenna heightReceiving antenna heightAudio channelFrequency= 800 feet.= 30 feet.= 15 kilocycles.= 42 megacycles.Maximum frequency deviations = 20 and 75 kilocycles.
222 FREQUENCY MODULATION, Volume Iin such a system, the increase in power would be two-to-one.The usualfactor of four-to-one assumes the more inefficient types of low-levelmodulation.The values of signal-noise ratio obtained for all of the curves werecorrected by subtracting one-half the maximum fading range as portrayedby Figure 2. Formula (4) was used to calculate the averagesignal-noise ratio for amplitude modulation and the fading correctionwas applied to obtain the minimum signal-noise ratio.It was assumedthat the transmission conditions of the fading correction curve werenear enough to the conditions of this example to allow this directcorrection without interpolation.Where the propagation curves of the corresponding amplitude-modulationsystem were to be. determined as well as those of the frequencymodulationsystems, which was the case in this example, the simplestprocedure was to draw the amplitude-modulation curves and then constructthe frequency-modulation curves which follow lines parallel tothe amplitude-modulation curve, but at higher signal-noise ratio levelsfor distances within the improvement threshold distances. To do thisthe average amplitude-modulation signal-noise ratios for fluctuationnoise were calculated from (4). These were corrected for fading andthe pre-emphasis gain of 5.6 decibels was added. For the low-deviationfrequency-modulation system, the fluctuation noise gain is equal to 1.73times the deviation ratio, p. (/* = 20/15 = 1.33) or 7.2 decibels. Theuse of pre-emphasis adds another 7.4 decibels to the frequency-modulationgain as compared to the amplitude-modulation system with preemphasissince the total gain due to pre-emphasis on the frequencymodulationsystem is 13 decibels. The transmitter power gain addsanother 3 decibels. Hence the curve for frequency modulation with adeviation of 20 kilocycles is 7.2 + 7.4 + 3 = 17.6 decibels higher thanthecorresponding amplitude-modulation curve for the region withinthe threshold of improvement distance of the frequency-modulationsystem. The frequency-modulation system with a 75-kilocycle deviationhas a larger deviation ratio (/a = 75/15 = 5) so that its total gainover the amplitude-modulation system with pre-emphasis is 18.7 + 7.4+ 3 = 29.1 decibels.For the case of impulse noise, the frequency-modulation gains areequal to twice the deviation ratio and the pre-emphasis gains are alsodifferent. For amplitude modulation, the pre-emphasis gain is 7.5 decibelsand for frequency modulation it is 4.5 decibels more or a total of12 decibels. Hence, the gain of the frequency-modulation system usinga 20-kilocycle deviation is 8.5 + 4.5 + 3 = 16 decibels. The correspondinggain for the system using a deviation of 75 kilocycles is 20 + 4.5+ 3 = 27.5 decibels.
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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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THE RATIO DETECTOR*!ByStuart Wm. Se
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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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