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Discussion in 'Electronic Basics' started by [email protected], Feb 16, 2007.

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  1. Guest

    I was just wondering what the word "threaded" refers to in the context
    of a Threaded Neill-Concelman (TNC) connector. I know threaded wires
    contain thin metallic threads for flexibility, but I don't think this
    is what threaded in TNC is talking about.

    Thank you.
  2. Because the connector is threaded. It has nothing to do with wire, it
    has everything to do with the actual connector (as it should). You have
    to screw the connector down to make the connection.

    The "Threaded" is there to differentiate it from the related BNC connector,
    which uses a bayonet type of mechanism to ensure a mechanical connection.
    Push down and twist, presumably how bayonets are attached.

  3. You are thinking of stranded wire, not threaded wire. A stranded wire
    is made of several strands of small wire, twisted together.

    The coupling ring of a TNC connector is threaded, like screws and nuts
    are threaded. A closely related connector is the BNC - Bayonet
    Neill-Concelman - the coupling ring on a BNC locks with a 1/4 turn,
    where a TNC will take several turns to lock securely.

    The UHF or PL-259 connector used for radio antennas, and the "F"
    connector used for cable TV in North America also have threaded
    coupling rings.

    Peter Bennett, VE7CEI Vancouver BC, Canada
    peterbb4 (at)
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  4. Lord Garth

    Lord Garth Guest

    Makes me wonder why the socket end is called an SO-239 rather than
    an SO-259 :)
  5. Rich Grise

    Rich Grise Guest

    It's just that those were the next available numbers in the "SO"
    (socket) part number queue and the "PL" (plug) queue. It's only
    coincidence that the 2 and 9 match. :)

  6. jasen

    jasen Guest

    threaded as in nut-and-bolt

    It's otherwise identical to BNC the bayonet-N.C. connector,
    (used on the front of lab equipment like oscilloscopes and on the back of
    (ancient) 10-base-2 network cards.)

    I'm sure wikipedia can adequately explain the similarities between the
    working of the BNC and the fixing of a knife to the muzzle of a carbine.

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