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BNC connector

Discussion in 'General Electronics Discussion' started by Sankhabrata Chandra, Oct 17, 2017.

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  1. Sankhabrata Chandra

    Sankhabrata Chandra

    4
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    Oct 17, 2017
    Why the BNC connector carry frequency up to 4 GHz?
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,505
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    Jan 21, 2010
    Because it can.

    Seriously, that question is so unfocused as to have no real answer.

    What do you actually want to know?
     
    Cannonball likes this.
  3. Sankhabrata Chandra

    Sankhabrata Chandra

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    Oct 17, 2017
    Sorry for the unfocussed question. I am a chemistry student and building one instrument and for this I want to know about the BNC connector. I have read few things on that. But my confusion is why BNC connector cannot carry more than 4 GHz signal. In text book it is written that BNC is for 0-4 GHz.
     
  4. davenn

    davenn Moderator

    13,983
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    Sep 5, 2009

    it can go higher ....
    good quality ones will get to 10GHz
    poor quality ones get lossy in the 5 GHz +

    just depends on how much loss you are willing to accept

    I would almost bet that that wasn't the exact wording aye ?
     
  5. Sankhabrata Chandra

    Sankhabrata Chandra

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    Oct 17, 2017
    Thank you very much
     
  6. dorke

    dorke

    2,342
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    Jun 20, 2015
    A bit more elaborated:

    To carry an Electromagnetic wave signal at a specific frequency range requires the "media" to be as "smooth" as possible,as not to disturb the prorogation of the signal from one point to the other .
    We do this by using "wave guides",most of them are coaxial cables.

    The connectors are used at the ends to physically connect the source and destination.
    This will insert a disturbance in the wave guide(transmission line) in the form of impedance mismatch because of the way the connector is build,the dielectric used,it's size,the quality of the mechanical connection etc.
    These mismatches are defined in many ways, the most common being insertion loss and return loss vs. frequency

    The higher the frequency the higher the disturbance.
    So, for higher frequencies a better design and build quality is needed..

    BNC isn't a good choice for high frequencies,
    use N-type(if space and budget allows) or SMA..
    For good performance,I personally wouldn't use BNC above 1GHz.

    Here is a catalog of K and V types that will reach 65GHz.
    For further reading on above 100GHz connectors development look here.
     
    Last edited: Oct 17, 2017
    hevans1944 likes this.
  7. hevans1944

    hevans1944 Hop - AC8NS

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    Jun 21, 2012
    This Wikipedia article says the Passband is typically 0 to 4 GHz. Without a deeper understanding of transmission line theory, the OP might be led to believe that somehow at 4 GHz the BNC connector suddenly stops working. Real world devices almost never suddenly stop working. Degradation in performance may occur rapidly, but almost never "suddenly," as in "now it works, and now it doesn't" behavior.
     
  8. davenn

    davenn Moderator

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    Sep 5, 2009
    which is why I explained it the way I did ;)
     
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