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- W2912231966 abstract "Recently, the V-Low band frequency is allocated to wide-FM broadcasting and multimedia broadcasting in Japan. Since those broadcasts are used as one of the means of transmitting disaster information, it is important to be able to receive the broadcasts at any time. However, the V-Low band frequency allocated to the broadcast wave has an overlap in the neighboring countries Korea and Japan. Therefore, when the duct propagation occurs according to the change in the atmospheric refractive index, it may cause overreach interference. We observed FM broadcasting waves from Korea at Kyushu Institute of Technology. And we evaluated the overreach propagation characteristics and estimated the effective earth radius factor in order to grasp the influence of radio interference in the V-Low band. Seasonal characteristics of overreach propagation were confirmed from the 3-year observation results. When overreach propagation occurred the effective earth radius factor was larger than 4/3 (the standard atmospheric condition), and the factor was recorded as a maximum value of 16.7." @default.
- W2912231966 created "2019-02-21" @default.
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- W2912231966 date "2018-10-01" @default.
- W2912231966 modified "2023-09-24" @default.
- W2912231966 title "3-year Observations on Overreach Propagation from Korea to Japan in V-Low Band" @default.
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- W2912231966 hasPublicationYear "2018" @default.
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