Re: Coax cable - When did it begin?
300 ohm ribbon cable was developed in the U.S. after research and development of the
most effective cost & performance to replace the original cotton sheathed twin pitch
covered feeder, which could be brittle but also melt in higher temperature locations.
Later air-spaced, and even screened twin 300 ohm cable was available and used up
to UHF. (Source, "Television" RCA book 1946)
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