Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

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phase modulation maintained constantFREQUENCY MODULATION 45(deviation between +
46 FREQUENCY MODULATION, Volume III.Deviation and Band WidthThe simple conception of a frequency-modulated wave, in whichthe frequency of a carrier wave of unvarying amplitude is alteredcyclically about its mean value, is sufficiently adequate if the maximumfrequency excursions of the carrier-wave frequency are large comparedto the modulating frequency, for example, in the case of a wave beingvaried between limits separated by, say, 150 kc with the variationoccurring sinusoidally at a 100-cyele per second rate.If, however, the maximum frequency excursion is of the sameorder of magnitude, or equal to,or less than the frequency of change,the case is not so simple. It has often been proposed in all good faiththat a communication channel could be narrowed by the use of frequencymodulation in which the deviation in cycles per second isthan the modulating frequency.However, it is axiomatic that any sidebandenergyless(and consequently the necessary intelligence component)in any type of modulation, whether frequency, phase, or amplitude, willnot approach the carrier closer than a frequency interval equal to themodulating frequency. Therefore, if a narrow-band receiver is usedto intercept a small deviation frequency-modulated wave whose modulatingfrequency is greater than one-half of the band width of thereceiver, none of the modulation will be received. If we assume thecase of a frequency-modulated wave with a modulating frequency of10,000 cycles per second, which causes a deviation of + and — 10,000cycles in the frequency of the carrier, a receiver with theoreticallyperfect band pass in its r-f and i-f circuits 19.9 kc wide with perfectlyperpendicular sides,tuned with the carrier at the center of the bandto receive that frequency-modulated wave, would not give any evidenceof what modulating frequency was being used. A pure unvaryingcarrier with neither frequency, phase, nor amplitude modulation wouldbe applied to its demodulating detector. It is true that in the examplecited the received carrier would be somewhat decreased in value(actuallyto about 76 per cent) from its unmodulated amplitude, but thisneed not concern us for the moment. The example is cited simply toemphasize the fact that in frequency and phase modulation, as wellas in amplitude modulation, the intelligence components are carriedin side-band energy, and that that side-band energy must be receivedin order to interpret or reproduce the originalmodulation.In the example cited above, side bands will exist not only at frequenciesof + and — 10 kc with respect to the carrier, but also at+ and — 20 kc, as well as at 30 kc, etc. 1 If the theoretically perfect1See publications listed in the bibliography for more complete explanationof this characteristic.
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FREQUENCY MODULATIONVolume IEdited
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Page 10 and 11: FREQUENCY MODULATION NOISECHARACTER
Page 12 and 13: NOISE CHARACTERISTICS 3w na - (u—
Page 14 and 15: NOISE CHARACTERISTICS 6to the ratio
Page 16 and 17: NOISE CHARACTERISTICS 7where C = ca
Page 18 and 19: •NOISE CHARACTERISTICS 9nF naF in
Page 20 and 21: NOISE CHARACTERISTICS 112G-)F1 aJ.
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Page 24 and 25: NOISE CHARACTERISTICS 15constant sh
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Page 28 and 29: NOISE CHARACTERISTICS 19modulation
Page 30 and 31: .NOISE CHARACTERISTICS 21vary direc
Page 32 and 33: NOISE CHARACTERISTICS 23and frequen
Page 34 and 35: 1NOISE CHARACTERISTICS 25curves for
Page 36 and 37: NOISE CHARACTERISTICS 27not conveni
Page 38 and 39: NOISE CHARACTERISTICS 29lation rece
Page 40 and 41: NOISE CHARACTERISTICS 31theoretical
Page 42 and 43: NOISE CHARACTERISTICS 33sponding or
Page 44 and 45: NOISE CHARACTERISTICS 35modulation
Page 46 and 47: NOISE CHARACTERISTICS 37signal was
Page 48 and 49: NC1SE CHARACTERISTICS .39Since the
Page 50 and 51: NOISE CHARACTERISTICS 41tude modula
Page 52 and 53: NOISE CHARACTERISTICS 43frequency m
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Page 58 and 59: FREQUENCY MODULATION 49IV.Interfere
Page 60 and 61: FREQUENCY MODULATION 61frequency in
Page 62 and 63: FREQUENCY MODULATION 53maximum perm
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Page 66 and 67: BAND WIDTH AND READABILITY INFREQUE
Page 68 and 69: BAND WIDTH AND READABILITY 59The re
Page 70 and 71: BAND WIDTH AND READABILITY 61Listen
Page 72 and 73: BAND WIDTH AND READABILITY 63The cu
Page 74 and 75: VARIATION OF BANDWIDTH WITH MODULAT
Page 76 and 77: VARIATION OF BANDWIDTH 67
Page 78 and 79: VARIATION OF BANDWIDTH0.0606 4998 7
Page 80 and 81: iVARIATION OF BANDWIDTH 71Example:
Page 82 and 83: ItVARIATION OF BANDWIDTH 73where 6
Page 84: whereVARIATION OF BANDWIDTHmEn=—
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A PRETUNED TURNSTILE ANTENNA*tByGeo
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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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