報告書番号

ET88007

タイトル（和文）

MICROWAVE SCREENING ON DIGITAL RADIO COMMUNICATION LINKS DUE TO MULTI CIRCUIT POWER TRANSMISSION LINES

タイトル（英文）

MICROWAVE SCREENING ON DIGITAL RADIO COMMUNICATION LINKS DUE TO MULTI CIRCUIT POWER TRANSMISSION LINES

概要 （図表や脚注は「報告書全文」に掲載しております）

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概要 （英文）

A METHOD OF ESTIMATING MULTICIRCUIT POWER TRANSMISSION LINE INTERFERENCE ON DIGITAL RADIO LINKS HAS BEEN DEVELOPED AND APPLIED TO SEVERAL KINDS OF DIGITAL RADIO SYSTEMS. THE MAJOR RESULTS ARE AS FOLLOWS: (1)METHOD OF ESTIMATING MULTICIRCUIT POWER TRANSMISSION LINE INTERFERENCE ON DIGITAL RADIO LINKS. ANY CONDUCTOR IN THE FIRSTFRESNEL ZONE IS ACCOUNTED FOR IN THE CALCULATION OF POWER TRANSMISSIONLINE INTERFERENCE (EQUIVALENT C/N DEGRADATION OR SCREENING LOSS). (2)GENERAL CHARACTERISTICS OF POWER TRANSMISSION LINE GENERAL CHARACTERISTICS OF POWER TRANSMISSION LINE INTERFERENCE (DISTANCE DEPENDENCY BETWEENPOWER TRANSMISSION LINE AND RADIO SITE,POWER TRANSMISSION LINE LENGTH DEPENDENCY IN THE FIRST FRESNEL ZONE,AND ANGLE DEPENDENCY BETWEEN POWERTRNASMISSION LINE AND RADIO POLARIZATION) ARE PRESENTED. IT SHOULD BE NOTED THAT THE INTERFERENCE DOES NOT NECCESARILY DECREASE EVEN IF THE POWER TRANSMISSION LINE IS REMOVED FROM THE CENTER OF THE RADIO PROPAGATION PATH. THE USE OF VERTICAL POLARIZATION IS AN EFFECTIVE WAY TO REDUCE THE INTERFERENCE. (3)INTERFERENCE CALCULATION FOR POWER TRANSMISSION LINE ON A MICROWAVE RADIO LINK. THE POWER TRANSMISSION LINE (187KV,FOURCIRCUITS) INTERFERENCE ON THE RADIO LINK (19.7KM,2GHZ,4PSK,1.5MB/S) WAS ESTIMATED AT NOT MORE THAN 0.1DB IN EQUIVALENT C/N DEGRADATION.

報告者

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