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The RST system is used by amateur radio operators, shortwave listeners, and other radio hobbyists to exchange information about the quality of a radio signal being received. The code is a three digit number, with one digit each for conveying an assessment of the signal's readability, strength, and tone. The code was developed in the 1934 by Amateur radio operator Arthur W. Braaten, W2BSR.〔(【引用サイトリンク】url=http://www.tubebooks.org/Books/arrl_1936.pdf )〕〔(【引用サイトリンク】url=http://www.qsl.net/yb0az/rst.html )〕 ==Readability== The R stands for "Readability". Readability is a qualitative assessment of how easy or difficult it is to correctly copy the information being sent during the transmission. In a Morse code telegraphy transmission, readability refers to how easy or difficult it is to distinguish each of the characters in the text of the message being sent; in a voice transmission, readability refers to how easy or difficult it is for each spoken word to be understood correctly. Readability is measured on a scale of 1 to 5.〔The beginner's handbook of amateur radio by Clay Laster, Page 379, McGraw-Hill Professional, 2000, ISBN 0-07-136187-1, ISBN 978-0-07-136187-3〕 # Unreadable # Barely readable, occasional words distinguishable # Readable with considerable difficulty # Readable with practically no difficulty # Perfectly readable 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「RST code」の詳細全文を読む スポンサード リンク
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