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BNC connectors: 50 or 75 Ohm?

Discussion in 'Datasheets, Manuals and Component Identification' started by Merlin3189, Jan 26, 2015.

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  1. Merlin3189


    Aug 4, 2011
    Quick question. I'm just sorting out some spare parts and have a lot of BNC connectors. I know most are 50 Ohm because that's mainly what I've used in the past, but I think some are 75 Ohm.
    Anyone got tips on how to tell them apart?

    (They are generally not attached to a cable, so I can't just look at the cable markings. Some plugs have manufacturer's markings, but most don't.)

    I thought I could just measure some diameters, but I think I'd need to know the dielectric constants as well and I can't see any way of determining that.
  2. davenn

    davenn Moderator

    Sep 5, 2009
    Usually, the centre pin for the 75 Ω connectors is thinner

    People have damaged many a 75 Ω socket by connecting a fatter 50 Ω connector into it

  3. Arouse1973

    Arouse1973 Adam

    Dec 18, 2013
    If you look at the ends of the connectors is the white dielectric different? Are there any that don't come to the top of the fingers?
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