On Thu, 3 May 2012 00:37:47 -0000, wrote:

wrote:
On 3 May,
wrote:

I was refering to the case where there is nothing to adjust the match and
getting something under 3:1 at the end of the feed line.

It was well within 1.5:1 within (part of) 10 and 12m bands.

After spending several hours with EZNEC trying to get that combination under
5:1 with no success, I find that hard to believe unless something in the
system is really lossy (like the feedline) and masking the SWR or the length
of the feedline just happens to be at a length to help the match.

EZNEC lacks an optimiser. Try 4NEC2 and let the optimiser tweak the
wire lengths for best VWSR in the various bands.
http://www.youtube.com/watch?v=kYy6Yur127A 25min
The bad news is that since the fan dipole works on several bands, the
optimizer has to be run individually for each band. Fortunately, it
is easy to limit the parameters that it changes to just the wire
length for that band in question. I'm tempted to build an NEC2 model
and see what happens. Maybe this weekend.

I blundered across this article on fan dipole construction:
http://www.hamuniverse.com/multidipole.html
http://sstowers.com/aa4cv/
If I can find a long straight location, that doesn't come too close to
a tree, I might try a fan dipole again.



--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558