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Recent content by vrs

  1. vrs

    thermal resistance

    Does anyone know when the concept and/or term: thermal resistance (Dt/Q; units of C/W) - first appeared in the literature? While I realize it's just a convenient restatement of Fourier's heat conduction equation and Newton's Law of Cooling (in the form of an analogy to Ohn's Law), I suspect it...
  2. vrs

    lpda design

    Thanks much for the comments. The salsburg.com ref is the Peter Rhodes, K4EWG, write up on the log periodic from the ARRL Ant. HB of 1974. I suspect that much of it was based on the work of Carrel and Isbell, listed in the bibliography. I think the expression is most like the one for the...
  3. vrs

    lpda design

    In the design of a log periodic one of the key steps is identifying the avarage characteristic impedance of a dipole. For a typical application see http://www.conformity.com/0005emc.html. The expression for this is given as 120*ln[(L/D) - 2.25)], where L is the length of the dipole and D the...
  4. vrs

    LPDA design

    In the design of a log periodic one of the key steps is identifying the avarage characteristic impedance of a dipole. For a typical application see http://www.conformity.com/0005emc.html. The expression for this is given as 120*ln[(L/D) - 2.25)], where L is the length of the dipole and D the...
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