Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

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RATIO DETECTOR 3931+P V 4aQ„°To find S, substitute in the expression for e,S =-9naX„ X,w 2 Q s4a1+- n*Q s4a Q»% a- 1 +« 29m X 8 Q, 1 n1+- w2 Q s1+a 2But— = aP1 +-4aQ,«.-.S:gmXsQ^n I P
394 FREQUENCY MODULATION, Volume ITHE DEVELOPMENT OF A FREQUENCY-MODULATED POLICE RECEIVER FOR ULTRA-HIGH-FREQUENCY USE*tByH. E. Thomas!RCA Manufacturing Co., Inc., Camden, N. J.SummaryThis paper first describes the general considerations bearing upondesign of a frequency-modulated mobile police receiver for use in the SO- toiO-megacycle band where the channel width is restricted to UO Kilocycles.The details of developing the various circuits around these considerationsare dealt with, and the paper then proceeds with a discussion of over-allperformance and field testing. Comparative and quantitative results showvery favorable performance using a double-superheterodyne circuit withautomatic-frequency control of the second oscillator.(12 pages; 7 figures; 2 tables)* Decimal Classification: R630.3.f RCA REVIEW, October, 1941.t Now with Engineering Products Department, RCA VictorCamden, N. J.Division,DEVELOPMENT OF AN ULTRA LOW LOSS TRANS-MISSION LINE FOR TELEVISION*!ByE. 0. JohnsonEngineering Products Department, RCA Victor Division,Camden, N. J.SummaryThe development of a low loss 300-ohm parallel wire polyethylenedielectric transmission line is described. Loss curves, as well as a photographof a production run sample of the line, are included. The disadvantagesof twisted pair and coaxial lines are discussed and the developmentalspecifications for a line to eliminate these disadvantages are setforth. The remainder of the paper deals with actual development of the lineand treats with the dielectric, line conductors, and line impedance. Resultsof field test are included. This line is also used for FM reception.(9 pages; k figures)* Decimal Classification : R320.41.t RCA REVIEW, June, 1946.
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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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Page 367 and 368: 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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