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The R-390A /URR is a general coverage HF radio communications receiver designed by Collins Radio Company for the US military. ==History== The R-390A military shortwave radio receiver was the result of a project undertaken by the U. S. Army Signal Corps in 1954 to replace the existing R-390 receiver then in use. The R-390 had done its job so well that the Corps decided continued use of this type of receiver necessitated an improved, reduced-cost version.〔http://web.archive.org/web/20070927011719/http://www.r390a.com/html/history.htm R-390A History〕 There are many references to the R390A in the open literature during this period; a picture of the receiver appeared in the May 1959 issue of the amateur radio magazine QST. Total production of the R-390A (as determined by the high serial numbers noted) is over 55,000 units. Initial production started in 1955 and ran through approximately 1970, and then was restarted in 1984 by Fowler Industries for Avondale Shipyards. Manufacturers and their approximate production numbers are: * Collins Radio Company 6,363 * Electronic Assistance Corp 15,338 (includes Dittmore Freimuth marked radios) * Capehart 4,242 * Motorola 14,873 * Stewart Warner 6,631 * Amelco/Teledyne/Imperial 7,958 (these companies were related through acquisitions) * Fowler Industries 5 Companies which made spare modules, but not whole sets were Communications Systems Corp., Clavier Corp. and Hacking Labs. 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「R-390A」の詳細全文を読む スポンサード リンク
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