Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

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FM EXCITER 169Data on many other circuits intended to accomplish automatic frequencycontrol have been published. A number of these make use ofthe scheme shown in Figure 6. The signal from the oscillator to becontrolled is fed to two amplitude-modulation detectors or mixers. Thesignal from the crystal-controlled reference oscillator is also fed to thedetectors, but through circuits that shift phase so that there is a 90-degree displacement of the reference frequency between the two detectors.The resulting beat frequency of the two oscillators will appearin the output of each detector, and because of the 90-degree phase shiftof one of the exciting frequencies, the beat frequencies will also bedisplaced by 90 degrees. The interesting feature of the circuit is that,Fig. 5as the frequency of the oscillator, being compared to the frequencyof the crystal, is caused to change through the synchronous or zero-beatcondition, there is a reversal in phase of one beat-frequency outputwith respect to the other.There are many ways in which to make use of this phase reversalto provide an indication as to whether the controlled oscillator frequencyis high or low. Several methods were investigated. The mostpromising idea was to make use of the fact that the two beat notesdisplaced by 90 degrees constitute a source of two-phase power and
170 FREQUENCY MODULATION, Volume Icould, therefore, be used to set up a rotating magnetic field in aninduction motor. Inasmuch as one phase reverses when the controlledoscillator frequency passes through zero beat, the rotation of the fieldf±OSCILLATORBEAT FREQUENCY—ft +9,°°BEAT FREQUENCY
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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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IMPULSE NOISE IN F-M RECEPTIONSByVe
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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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Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

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