Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

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TRANSMISSION THROUGH A NETWORK439T = 89.5/22.8 degrees = the downsweep response at& = 2tt X 0.994 X 10 6Plotting the points obtained on work sheets for (5 — m ) = 2-n X 2000,2tt X 4000, 2tt X 6000, • • • , 2tt X 24,000 determines curves (a) and (b)
440 FREQUENCY MODULATION, Volume I5, the calculated amplitude—instantaneous-input-frequency response,agrees very closely with (b) of Figure 2, the experimental amplitude—instantaneous-input-frequency response. The reader may be interestedin comparing the results of the calculation with the resultsobtained by Roder on a very similar problem, which he solved by theaid of a differential analyzer. His response curve was plotted as afunction of time. 7XVI (t) . For each of the work sheets prepared for different assignedvalues of vt, plot on the response graphs.Q = the response at 2-n- — vtR = the response at vtS = the response at -n-+ vtT = the response at it — vt.The magnitudes of Q, R, S, and T for each work sheet give four pointson the desired amplitude—time response curve. The phases of Q, R,S, and T give four points on the desired phase-shift—time-responsecurve.AppendixIf a steady-state driving voltage e' at is applied to the input terminalsof a linear network, it can be shown that the steady-state solutionfor the voltage at the output terminals 8 is of the form -R(m)£ j[o)H-0] # r ( ra ) is the ratio of the peak amplitudes of the output andinput voltages, and 6(a>) is the phase difference. Abbreviating e^ (as E lv+ and R(a>) e K*+ei°>n as E mt +, it follows thatE oat +=E ln+RM *M«K (34)Furthermore, if a steady-state driving voltage £-*>* is applied to theinput terminals of the same linear network, itcan be shown that thevoltage at the output terminals is of the form R (-whereR and 6 are equal to R and of (34). Setting e~> at as E in~ andRM £ -;[«*+«.(35)7Hans Roder, "Effects of Tuned Circuits upon a Frequency-modulatedSignal," Proc. I.R.E., vol. 25, pp. 1617-1648; December, 1937.«H. Pender and S. Warren, ELECTRIC CIRCUITS AND FIELDS,McGraw-Hill Book Company, New York, N. Y., 1943, pp. 161-163.
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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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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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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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