"Roy Lewallen" wrote in message
...
Frank's wrote:

I can send you a JPEG of an NEC graphic. It is only 9 kB. The array
looks like two stacked 3 element yagis, with only the upper array
driven. I deleted the lower array, and it only made a slight
difference to the performance.

Sure doesn't look like stacked Yagis to me. No two elements are at the
same height. Or are we talking about the same model?

Roy Lewallen, W7EL

If I got the coordinates right, then tags 2, 4, and 6 are within +/- 2 ft of
the
same plane and parallel to the Y axis. Tag 6 is in the middle, and is the
driven element. Tag 2 is longer (Reflector) than the driven element, and
Tag 4 is
shorter (director). The currents in these 3 elements appear to be about
what
I would expect in a 3 element beam. The other three Tags (1, 3, & 5) are
more random in their placement, and far removed from the "Yagi" like plane.
The do not seem to contribute very much
to the performance. The radiation pattern is very close to a Yagi
pattern, although the vertical beam width appears wider.

Just to be sure I did not mess up -- again! -- I have pasted the code below.

Frank

CM Gaussian Array
CE
GW 1 31 273.3 164.1 820 273.3 -164.1 820 0.65
GW 2 41 25.1 203.3 1079 25.1 -203.3 1079 0.65
GW 3 31 171.1 202.1 582 171.1 -202.1 582 0.65
GW 4 30 321.6 178.4 1036.5 321.6 -178.4 1036.5 0.65
GW 5 41 2.1 206.5 701.2 2.1 -206.5 701.2 0.65
GW 6 31 153.5 194.5 1038.1 153.5 -194.5 1038.1 0.65
GS 0 0 0.025400
GE 1 -1 0
GN 2 0 0 0 13.0000 0.0050
EX 0 6 16 0 1 0
FR 0 5 0 0 14.15 0.05
LD 5 0 0 0 3.08E7
RP 0 181 1 1000 -90 0 1 1
EN