Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

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FREQUENCY-MODULATION FIELD TEST 117On this curve there are plotted a-c volts as the abscissa and carrierfrequency as the ordinate. The audio input to the transmitter issuperimposed on the reactance tube d-c bias.Figure 4 shows the overall frequency response of W2XWG andthe Bellmore receiver before pre-emphasis and de-emphasis wereinserted.12010080604020s_ 8I-J-20&406080100120
118 FREQUENCY MODULATION, Volume Ifeet above the sidewalk. Figure 6 shows the folded dipole in operatingposition.The circuit arrangement of the special 1000-watt transmitter isillustrated in the form of a block diagram in Figure 7. The frequencymodulator comprises the five blocks at the upper right side, containingRCA 6V6, 6K8 and 6H6 tubes.The degree of frequency deviation was measured by a methodrecently described in the RCA Review 2 . The method consists of applyinga constant frequency tone to the transmitter input terminals andgradually increasing the voltage until the carrier amplitude drops tozero. When this occurs, the frequency deviation is 2.405 times the audioFig. 4modulating frequency. This method is simple and very satisfactory ifreasonable precautions are taken.The ReceiversIn order that an exacting comparison of amplitude and frequencymodulation can be made, it is very desirable that the receivers forthe two systems be as nearly ideal and alike as possible.This practiceminimizes otherwise possible errors due to differences in receiver performance.The ideal way to build such receiving systems would be the2A Method of Measuring Frequency Deviation, M. G. Crosby, EGAReview, pp. 473-477, April, 1940.
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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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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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