Buck wrote:
Cecil Moore wrote:
I've added a Smith Chart graphic to my All-HF-Band-No-Tuner-Antenna
information on my web page.

I finally got to see the picture. Earlier, it loaded so slowly I only
got to see the top 10% after ten minutes or so.

QSL.NET is notoriously slow. I'm going to get a new web page supplier
one of these days.

If i read it correctly, you are saying that by adjusting the feedline
length, you have a 50 match at any band.

Close - by adjusting the feedline length, I have between a 25+j0 ohm
and a 100+j0 ohm "match" on any HF ham band. Any purely resistive
impedance between 25 ohms and 100 ohms will yield a 50 ohm SWR less
than 2:1. Most transmitters are satisfied with an SWR of less than
2:1. Any 450 ohm SWR between 4.5:1 and 18:1 (in the green zone) will
yield a 50 ohm SWR less than 2:1 if the proper length of feedline is
chosen.

It sounds like this antenna and feed match....

It is a tuned feeder that tunes the antenna system to resonance. To
get a 50 ohm SWR less than 2:1, the dipole needs to be 1/2 wavelength
on the lowest frequency of operation. That makes virtually all antenna
feedpoint impedances fall within the green target zone.

For instance, this feedline length adjustment will not work on a 102
ft. dipole (G5RV) used on 80m. The low R and high X causes the 450
ohm SWR to be higher than 18:1 so a 50 ohm SWR of 2:1 is impossible
without a tuner or network.

Here's the math:
450/18 = 25 ohms 50/25 = 2:1 SWR at current maximum point
450/4.5 = 100 ohms 100/50 = 2:1 SWR at current maximum point
--
73, Cecil http://www.qsl.net/w5dxp

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On Wed, 01 Jun 2005 09:15:05 -0500, Cecil Moore
wrote:

I've added a Smith Chart graphic to my All-HF-Band-No-Tuner-Antenna
information on my web page.

This might very well be the best opportunity that I will ever have to
get in a plug for SmartSmith, which is not a demo but rather a full
featured SmithChart program with extensive Help file and is available
completely free at the following:

Download Site:
http://zaffora.f2o.org/W9DMK/W9dmk.html
High Speed Download Site:
http://64.217.230.66

Bob, W9DMK, Dahlgren, VA
Replace "nobody" with my callsign for e-mail
http://www.qsl.net/w9dmk
http://zaffora/f2o.org/W9DMK/W9dmk.html

Cecil:

I must say, you are quite a talent, your threads draw more attention,
debate, argument and blood to boil--that I grow ill with jealousy!!!
grin

Warmest regards,
John

"Cecil Moore" wrote in message
...
I've added a Smith Chart graphic to my All-HF-Band-No-Tuner-Antenna
information on my web page.
--
73, Cecil http://www.qsl.net/w5dxp/smith.htm

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