Welcome to the R-390A Frequently Asked Questions (FAQ) Page. The R-390A/URR
radio receiver is arguably the best performing high-frequency (HF)
receiver of the tube era. Its sensitivity, selectivity, resistance to adjacent strong
signal overload and resettability set it far apart from its contemporaries.
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It was designed in the early 1950's by Collins Radio Company under government
contract and manufactured by a number of companies.
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The receiver was used in may different roles in the U.S. military,other
government agencies, and civilian operations ranging from point-to-point radio communications to
Signals Intelligence (SIGINT) gathering to communications for the Apollo
space program.
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This compendium of knowledge is assembled to provide those with an interest in
restoring, operating, or just reading about the history of the R-390A/URR with
a set of reference material to assist in their endeavours.
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This page would not have been possible without the generous efforts of many
contributors who have provided documentation, recollections, experience, and
opinions in abundance. Their contributions are attributed on the pages where
they appear.
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