NDLI: Radio Field Intensity and Distance Characteristics of a High Vertical Broadcast Antenna

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Radio Field Intensity and Distance Characteristics of a High Vertical Broadcast Antenna

Content Provider	IEEE Xplore Digital Library
Author	Kirby, S.S.
Copyright Year	1913
Abstract	During December, 1934, field intensity records of emissions from radio station WBT, Charlotte, North Carolina, were made at seven different distances from the transmitting station before and after the construction and use of a high mast antenna. In addition, field intensity measurements were made at eight points on a circle at a distance of one mile from the transmitting station. The results showed that the substitution of the mast antenna for the older T and L antennas produced much greater ground-wave field intensities near the transmitter and somewhat greater total field intensities at greater distances. At the same time the amplitude of the fading was reduced at the first three recording stations at distances sixty-nine to 142 kilometers. The fading at these first three stations was of a more rapid type than at the more distant stations. The antenna change did not appreciably affect the frequency of the fading. Wires were added to the mast antenna to increase its top capacity and thus make the current distribution in this antenna more nearly sinusoidal. This change seemed to reduce the fading amplitude at the first three recording stations by the suppression of certain high angle radiation rather than by an increase of the intensity of the ground wave. With all conditions of the transmitting antennas used greater values of the averages of the ten-minute peak field intensities were recorded at the receiving station at Meadows, Maryland, 552 kilometers, than at any other station from sixty-nine to 879 kilometers.
Starting Page	859
Ending Page	871
Page Count	13
File Size	4427435
File Format	PDF
ISSN	07315996
Volume Number	24
Issue Number	6
Language	English
Publisher Date	1936-06-01
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radio broadcasting Transmitting antennas Fading NIST Antenna measurements Radio transmitters Frequency Wires Current distribution Receiving antennas
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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