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...
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...
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...
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...
