Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

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LOCKED-IN OSCILLATOR RECEIVER 261current is produced in the plate circuit, having component frequencies2o>, 3
262 FREQUENCY MODULATION, Volume IFig. 5—Effect on circuit.and thus will have an angular velocity relative to OA equal to thedifference of the two angular velocities.Now consider the instantaneous condition shown in Figure 4.Theinjected current AB has a component AC in phase with OA and anothercomponent AD, 90 degrees out of phase with respect to OA. Let thisresultant current OB be applied to a tuned circuit LC as shown inFigure 5. Since the LC circuit is tuned to 860 kilocycles, it will be atresonance with respect to the current OC which isalso 860 kilocyclesand equals i a + i b. The quadrature current AD is a leading currentat the instant shown by Figure 4, and the result is the same as thoughan additional condenser C is in the circuit. The effect is to decreasethe natural frequency of the tuned circuit.Now consider the condition at a later instant as shown by Figure 6.Since the vector AB is rotating with respect to OA it has now rotatedto the new position as shown. The injected current AB now has anin-phase component AC as before, but the component AD is nowlagging instead of leading. If this current OB is now impressed onthe circuit of Figure 5,the lagging component AD will cancel part ofthe leading current through C and this will be equivalent to reducingthe capacitance C since the circuit is now drawing a smaller leadingcurrent. This will raise the resonant frequency of the tuned circuit.It is now evident that the circuit of Figure 2 behaves like a reactancetube and swings the frequency of the tuned circuit back andforth. It is easy to see that if the frequency of the incoming signalis approximately five times that of the tuned circuit, a point will bereached when the frequency of the tuned circuit becomes exactly oneFig. 6—Vector diagram.
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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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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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