The Collins R-390A receiver was designed in the early 1950s and first delivered in 1953. | 4 F 1 E B D Amateur Radio
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The Collins R-390A receiver was designed in the early 1950s and first delivered in 1953. | 4 F 1 E B D Amateur Radio
21.9K viewsJan 15, 2025
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The Collins R-390A /URR military shortwave radio receiver was the result of a project undertaken by the United States 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. 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 QST. The total pr
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The Collins R-390A /URR military shortwave radio receiver was the result of a project undertaken by the United States 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. 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 QST. The total pr
3.1K viewsSep 12, 2024
Facebook4 F 1 E B D Amateur Radio
R-348 receiver DEMO of 89 V reference & 12AX7 triode S-meter circuit like a Collins R-390 receiver.
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R-348 receiver DEMO of 89 V reference & 12AX7 triode S-meter circuit like a Collins R-390 receiver.
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