BNC connector
BNC (from Bayonet Neill–Concelman, sometimes erroneously referred to as the Bayonet Naval Connector or the Baby N Connector) is the most common coaxial connector standard for measurement equipment up to 1 GHz.
It was patented in 1951 by Hazeltine Research, Inc. It is available in different impedances, but 50 Ω is, by far, the most common.
Tektronix gear transitioned from UHF connectors to BNC connectors in the early to mid-1960's. For some pieces of equipment, a conversion kit was available.
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Pictures
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BNC Female
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BNC Male
