Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

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zPROPAGATION CHARACTERISTICS 95a time lag with respect to that, traveling over the shorter path. Hencethe frequency modulated signal traveling over an earlier path may beexpressed by/ Pd \e = Ea sin I wt -) cos pt 1(1)\ F m /where co = 2wXF c ,F c= carrier frequency, Fd = peak frequency deviationdue to modulation, F m = modulation frequency, and p = 2irXFm .<strong>The</strong> signal traveling over a later path may be expressed bye = E 1 sin < cot + /3 -\ cos (pt + a)\ (2)\ F m )where /3 and a take into account the time delay imparted to the carrierwave and the modulation, respectively.Considering only a two-path case first, the two waves given by (1)and (2) may be combined into a single resultant wave by means of thecosine law resulting in/ JTd E,e= X E + E{ + 2E E - 2 Icos \cos (pt + a)+p cos pt'I F mF msinsin < — cos (;j/+«)+(3 cos ptFj [F m F mcot-\ cos /;/+tan -1F m E LFd Fa(-cos < — cos (pl-\-a)-\-j3 cosptE, -'-'1 \F W m F* m(3)Applying the sum and difference formula for the cosine, calling Eo/Ei= li, and 2F,i/Fm sin a/2 = Z, givessine= A/E 2 + E l-+ 2E E 1 cos jzsin (pt + — J-/3Jsin
96 FREQUENCY MODULATION, Volume Iwl H cos pt — tan-1Fm= F C +F d cos p< — -m\ff + cos «L~sin( />/ +— )-(3>2ttrf
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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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Page 56 and 57: FREQUENCY MODULATION 47band pass of
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Page 60 and 61: FREQUENCY MODULATION 61frequency in
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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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CHARACTERISTICS OF THE PYLON FM ANT
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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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