Re: radiation pattern of log-periodic antenna

Roy Lewallen wrote:
Frank wrote:

. . . NEC source code is available
in FORTRAN, so you could translate it to C.


It was done long ago. See http://www.nic.funet.fi/pub/ham/antenna/NEC/swindex.html for sources. A google search might reveal others.

Roy Lewallen, W7EL

A simpler approach, depending on the accuracy needed, might be to convert some matlab codes. Orfanidis's book has matlab routines to do the mutual coupling calculations and the transmission lines and to generate a radiation pattern from the element currents. heck, he might even have a LPDA model in there.. it would be a good exercise for a class on computational electromagnetics. If it's a free space model, that might be the easiest.

I have heard, but do not know from my own experience or anyone I know (essentialy it is totally unsubstantiated rumor), that the NEC repository C code version of NEC (converted by something like f2c) has a number of problems. Given the age of the original FORTRAN code and its coding style, I can believe that a machine translation might introduce artifacts.
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