Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

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FREQUENCY-MODULATION FIELD TEST 123be produced. Separate means were provided for controlling the noiseamplitudes without changing the character of the noise.Figure 10 shows measurements made with the special KCA field testreceiver and two commercial receivers. Eeceiver input microvolts areplotted against audio output level. <strong>The</strong> drop in the commercial receiversis due to r-f gains insufficient to operate the limiters at low input
124 FREQUENCY MODULATION, Volume IOne of the <strong>Radio</strong> Facilities engineering cars used by NBC for suchmeasurements is shown in Figure 12. Each of these cars is a passengersedan in which the body and interior has been modified to house a75B RCA 500-kc to 20-Mc field intensity measuring set, a 301A RCA18-Mc to 155-Mc field intensity measuring set, a modified RCA 302A± .«4«a,W2XWG FIELD INTENSITYMICROVOLTS PER METER100J WATTS 42^6 MCANTENNA HEIGHTS 30' - 1300'Fig. 11noise meter, 2 Esterline Angus recorders, a driveshaft-to-recordergear and clutch system, a special vernier speedometer and distancerecorder, an automobile receiver, an aviation type broadcast loop, au-h-f universally mounted antenna, a swivel-mounted searchlight, acompass and a steel mounting frame with aviation shock absorbersfor instruments. Quick-demountable mechanisms permit easy removalof measuring gear.
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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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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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DUPLEX TRANSMISSION OF FREQUENCY-MO
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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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