Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

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MULT1PATH DISTORTION285andd =st3X10 8Dmeters.(13)D- 30,000 '~ 0= 35,000 ~0= 60,000- D= 75,000'^^^^P^^D=I00,000~ 0=150,000-wmrnm^D= 175,000' 0=200,000-Fig. 9— -Oscillograms of carrier envelopes.
286 FREQUENCY MODULATION, Volume IFig. 10—Oscillogram of carrier envelope.The time delay*o ="d3 X 10 8 D= — seconds. (14)If D is the frequency shift required to go from out-of-phase, to inphase,and out-of-phase again, the time delay will be 1/D.Field TestsTo study the distortion encountered in New York City, the NBCtransmitter at the Empire State Building was operated with 300-cyclepure-tone modulation and a deviation of ± 75 kilocycles. A mediumpricedreceiver and an antenna were set up in a room next to the transmitter.The antenna could easily be located to give two-path reception,with a time delay of about seven microseconds. Figures 11 and 12show the carrier envelope and the discriminator output. In Figure 11the two waves canceled each other near one end of the swing. Theresultant amplitude modulation which passed the limiter, and thecoincidental phase modulation gave the result shown in Figure 12.One half of the cycle is relatively free from distortion, since the twosignals did not go out of phase at any part of that swing. The twoirregularities in the audio output correspond to the point of cancellation.This distortion could be eliminated by correct antenna location.In the RCA Building on the side away from the transmitter,theTime£ FrequencyFig. 11—Carrier envelope.Fig. 12—Discriminator output.
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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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—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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Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

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