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Resonant frequency formula

Discussion in 'Electronic Design' started by Kevin Doyle, Jun 22, 2005.

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  1. Kevin Doyle

    Kevin Doyle Guest

    Hi all,
    As we all know Fr of a resonant circuit is 1/(2PiSqrt(LC))
    I saw in the ARRL hand book that they have this formula but have 159 where
    the one is.
    I also saw the use of it here>
    If 159 is above the line does this mean at Fr the resistance of the tank is
    159 ohms?

  2. Andrew Holme

    Andrew Holme Guest

    No. 159 ~= 1000 / (2*pi).

    They've changed the units of f, L and C from Hertz, Henrys and Farads to
    MHz, uH and pF.
  3. Kevin Doyle

    Kevin Doyle Guest

    Thanks for that.

  4. Yep, a fine example of an attempt to simplify things by making them
    more obscure.

    Stick to SI. Always.

    Jeroen Belleman
  5. Paul Burke

    Paul Burke Guest

    What's your weight, then?
  6. Fred

    Fred Guest

    9.81*kg ? :))
  7. Fred Bartoli

    Fred Bartoli Guest

    Stick to basic physics, always. :)
    Weight is irrelevant: it doesn't depends on you only and changes everywhere
    you go.

    You should have asked the right question: what's your mass?
    Then comes the right answer.
  8. Paul Burke

    Paul Burke Guest

    11 o'clock at St. Mary's?

    Paul Burke
  9. Fabio G.

    Fabio G. Guest

    "Fred Bartoli"
    I remember some people who confused the concept of weight and mass.

    To make clear the difference I finally said: "you can think the mass as
    the number atoms of an object. If you are on the moon or on the earth
    the number of atoms (mass) will not change, but the weight (influenced
    by the gravity force) will."


    Per rispondermi via email sostituisci il risultato
    dell'operazione (in lettere) dall'indirizzo
    To reply via email write the correct sum (in letters)
    in the email address
  10. Ah, so a mole of Hydrogen has the same mass as a mole of Uranium. Got
    it! ;-)
  11. Well, irregardless of what element, what do you do with the mole tunnels
    on your lawn?
    "There was a young woman named Ells
    Who was subject to curious spells
    When got up very oddly,
    She'd cry out things ungodly
    by the palms in expensive hotels."
    -- Edward Gorey
  12. Rich Grise

    Rich Grise Guest

    Well, you _do_ admit that a gram of gold has the same mass as a gram
    of feathers, right?

  13. ....but not the same number of atoms.
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