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Title: 大型旋網船の無線方向探知機の誤差について
Other Titles: On the Errors in Measurements of Radio Direction Finder on Large-sized Purse-seiner
Authors: 梅園, 茂 / 小妻, 勝
Authors (alternative): Umezono, Shigeru / Kozuma, Masaru
Issue Date: Aug-1979
Publisher: 長崎大学水産学部
Citation: 長崎大学水産学部研究報告, v.47, pp.91-95; 1979
Abstract: Error in measurements of a radio direction finder which may be caused by various reasons are generally expressed as quadrant errors. Aboard a large-sized purse-seiner like the training vessel Kakuyo-maru or Hayabusa-maru No. 2, however, semicircle errors were also observed at 2070 kHz and 2350 kHz. The following aspects are discussed in this report. In a large-sized purse-seiner, the hugeness of the hull and the complicated structure of the vessel, especially intricate stays of the mainmast with a crow's-nest, often cause either semicircle errors or quadrant errors in measurements of radio direction finder according to the frequency of the electric waves. Characteristic to large-sized purse-seiners in that values of the semicircle error tend to be abnormally big on 2070 kHz, and we must be very careful in determining the direction. The position to install the loop antenna must be chosen so as to minimize the error.
URI: http://hdl.handle.net/10069/30624
ISSN: 05471427
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:第47号

Citable URI : http://hdl.handle.net/10069/30624

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