DAVID CUTHBERT <telegraph...@gmail.com> wrote: > why must we continually test NEC against measurements? The work by N6LF has > shown great correlation between simulation and the real world. > Those of us who design electronic circuits (including EM) in the world of > computer simulation have great faith in the various programs and NEC-4 (and > possibly NEC-2) should give us an adequate A-B comparison.
The question of correlation with reality must be answered for each particular sumulation. NEC works most accurately with straight thin wire antennas. It leaves much to be desired with telescopic tube elements, and it fails completely to predict effects of booms in case of VHF/UHF antennas, etc. In those and other cases, there are programs that work much better. For example, WIPL-D computes telescopic tube elements much more accurately than NEC (or MININEC), and can also accurately model influence of booms and other nearby conductors. 73, Sinisa YT1NT, VE3EA _______________________________________________ Stew Perry Topband Distance Challenge coming on December 29th.