Hello Mark,
As soon as you add a few 120 ft radials on the ground, this antenna will
starting working better. The more you add (to a point) will even help more.
Don't worry if they can't be all the same length.
73,
Tim K3LR
-----Original Message-----
From: topband-bounces@contesting.com [mailto:topband-bounces@contesting.com]
On Behalf Of Mark Lunday
Sent: Saturday, November 06, 2010 8:44 PM
To: topband@contesting.com
Subject: Topband: 160 meter current-fed T antenna, where did I go wrong?
ON4UN?s book, 3rd edition, Chapter 9, page 9-46. Pretty simple concept?the
vertical portion is ¼ wavelength, and the total horizontal length is ½
wavelength.
Higher radiation resistance, not nearly as dependent upon ground. Looks
like I can get by without the radial wires and just use a good ground rod.
Can?t do anything about the soil in the near field, anyway.
So I put it together, with remote tuner at the base (LDG Z-11).
The tuner cannot find a match, which is probably due to the RF. It?s using
the coax as a ground path, looks like. I can see RF getting into the coax
even with a commercial choke before the tuner (shows up coming back into the
shack on the remote antenna switch control lights).
Did I design the antenna wrong. Even though the wire is insulated, the
horizontal section goes through 2 trees. ? The ends are not free and clear
of the trees.
Am I wrong about the radials? What am I missing?
Also, I read NZ4O?s article: http://www.wcflunatall.com/nz4o9.htm which
seems to validate my approach.
Suggestions/ideas appreciated. Thanks
Mark Lunday
WD4ELG
_______________________________________________
UR RST IS ... ... ..9 QSB QSB - hw? BK
_______________________________________________
UR RST IS ... ... ..9 QSB QSB - hw? BK
|