high q factor inductor

Discussion in 'The Projects Forum' started by pafrazier, May 26, 2012.

  1. pafrazier

    Thread Starter Active Member

    Jun 4, 2011
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    0
    Hi,

    Does any one know what the parameters needed for winding a high q coil? Also the parameters for a high q copper tube?

    Thanks
     
  2. bertus

    Administrator

    Apr 5, 2008
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  3. pafrazier

    Thread Starter Active Member

    Jun 4, 2011
    57
    0
    Thanks for the links
     
  4. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    2,040
    287
    The thing to remember about inductors is that the inductance goes up as a square of the number of turns, while the resistance goes up as a direct proportion to the number of turns. So, whatever gives you the most inductance for a given length of wire will have the most Q.

    For a SINGLE LAYER solenoid, the optimum Q gives you a coil Aspect Ratio (ratio of diameter to length, of about 1.15. There's a NAME for this coil which I've forgotten, but it's a very good indicator of the best coil you can make...at least with an air core. :)
     
  5. wayneh

    Expert

    Sep 9, 2010
    12,123
    3,048
    If you search around for the Wheeler formula, you'll come across that aspect ratio. I don't recall it's name either. Maybe just "optimum solenoid" or such.
     
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