Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

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:INPUT IMPEDANCE OF PENTODES 307general, circuit values and structural features were designed to simulateconditions found in typical circuit applications.For these reasons the graphically presented data is given in termsof smoothed out curves representing gross phenomena.Input ResistanceThe data is given in terms of input resistance since this is ofpractical interest to the designer. In the discussion, however, inputconductance is also used because, when complex, it is more readilyresolved into its component factors.Figure 1 gives the results of measurements on a number of tubesillustrating the relationship between the input resistance and thefrequency.These tubes were operated under the conditions given inTable 1. The circuit connections are shown in Figure 2, where C hasthe values 4000 and 500 micromicrofarads for thefrequency ranges10-50 and 50-200 megacycles respectively.The input conductance of a vacuum tube with fixed operatingvoltages may be considered as varying with frequency according to theexpressiong l= k l + k af + k^p (1)where the fe's are constants for a specific tube and for specific operatingvoltages. The terms k t and hj are primarily dielectric losses due toleakage and hysteresis respectively, and distinguished from k 3f 2 whichis electronic. The electronic term, which is of particular interest athigh frequencies, is generally resolved into two factors, i.e. the motionof electrons in the cathode-to-plate space and the reaction of the platecurrent through any residual coupling element between the plate andgrid circuits.Although these factors could be analysed by means ofelectron ballistics and circuit theory an empirical method isas being more practical for engineering purposes.indicatedIf k tand k zf were negligible (1) could be written in terms of inputresistance as:1R< =—(2)Plotted in logarithmic coordinates (2) would give a straight line witha negative slope of 2. This is shown in Figure 1 for the purpose ofcomparison with the measured values.The departure at low frequencies from the theoretical curve ia dueto the increasing importance of k t and kj.
308 FREQUENCY MODULATION, Volume I10 100FREQUENCY- MEGACYCLES PER SECONDFig. 1—Input resistance vs. frequency with plate by-passed and tubesoperated under conditions given in Table 1.
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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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IMPULSE NOISE IN F-M RECEPTIONSByVe
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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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Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

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