On Sat, 12 May 2007 06:42:30 -0700, Danny Richardson wrote:

http://www.cebik.com/wire/vang.html

Good morning, Danny.

Thanks for the pointer. That one was a real eye opener. I always thought
that any angle 90 degrees or greater at the feedpoint was OK. I think
mine is something like about 100 degrees. I'll see if I can raise the
ends up a bit and see what difference that makes.

On Sat, 12 May 2007 10:37:13 -0400, Rick (W-A-one-R-K-T) wrote:

Thanks for the pointer. That one was a real eye opener. I always thought
that any angle 90 degrees or greater at the feedpoint was OK. I think
mine is something like about 100 degrees.

Actually I just calculated it out and it's more like around 130 degrees,
or each leg is just 25 degrees down from horizontal. So, according to
Cebik that should be pretty good.

Rick (W-A-one-R-K-T) wrote:
On Sat, 12 May 2007 10:37:13 -0400, Rick (W-A-one-R-K-T) wrote:
Thanks for the pointer. That one was a real eye opener. I always thought
that any angle 90 degrees or greater at the feedpoint was OK. I think
mine is something like about 100 degrees.

Actually I just calculated it out and it's more like around 130 degrees,
or each leg is just 25 degrees down from horizontal. So, according to
Cebik that should be pretty good.

What is the length of your feedline?
--
73, Cecil http://www.w5dxp.com

On Sat, 12 May 2007 12:47:32 -0500, Cecil Moore wrote:

What is the length of your feedline?

That I don't know at the moment. I downloaded your imax.exe program and
ran some numbers.

There sure aren't very many numbers that are good for all bands 160
through 10.

No doubt my feedline is wrong for a lot of frequencies, made more clear by
the fact that there are a few frequencies where my LDG autotuner can't
find a match.

However, how much does the feedline length matter IF the autotuner is able
to find a good match point?

I can get 1.5:1 or better from everywhere in the 160 and 80 meter bands,
and the high end of the 40-meter band (on the low end I can't get below
about 2:1).

I'm about to go outside and try some different feedline lengths.

Rick (W-A-one-R-K-T) wrote:
No doubt my feedline is wrong for a lot of frequencies, made more clear by
the fact that there are a few frequencies where my LDG autotuner can't
find a match.

However, how much does the feedline length matter IF the autotuner is able
to find a good match point?

Some impedances are outside the matching range and some
impedances are barely inside the matching range. Some
of the latter may not be a "good" match point. I model
my antenna systems to get a ballpark idea of what
impedance I am up against and use an antenna analyzer
to fine tune the system.
--
73, Cecil http://www.w5dxp.com