The inverted L loads just fine to about 700 watts and then causes the Alpha
amp to fault out. I think I am getting a sudden change in antenna impedance.
The antenna is fed through a 5 KW rated choke balun. The feed line exits the
base between radials.
Remove the balun. It's not doing
The sloper loads fine all the way up to 1500 watts. The inverted L loads
just fine to about 700 watts and then causes the Alpha amp to fault out. I
think I am getting a sudden change in antenna impedance. The antenna is fed
through a 5 KW rated choke balun. The feed line exits the base between
The sloper loads fine all the way up to 1500 watts. The inverted L loads just
fine to about 700 watts and then causes the Alpha amp to fault out. I think I
am
getting a sudden change in antenna impedance. The antenna is fed through a 5 KW
rated choke balun. The feed line exits the base
through a 3 inch diameter
branch. So there is a possibility this might be the problem depending on how
your wire is routed.
73 Jack
--- On Tue, 11/27/12, Ashton Lee ashton.r@hotmail.com wrote:
From: Ashton Lee ashton.r@hotmail.com
Subject: Topband: Inverted L SWR Jumps ???
To: topband
Ash,
You said, I've replaced every component in the system
except for the antenna wire.
Also, if the antenna wire is (or is partly) an insulated
variety, it is possible to have an open fault inside a good exterior
insulation.
Charles - N5UL
Hobbs, NM
Remove the balun. It's not doing anything for your and is a potential source
of loss and problems. Coaxial cable is unbalanced, as is a ground-fed
inverted L. No need for a balun.
Unfortunately, that is not a universally true statement.
MOST antennas are in a neither world of being neither
Ok, everyone thanks for all the help.
I rebuilt the antenna from new wire, built a two insulator termination at the
end of the horizontal section where the high voltage is, I rehung the new
antenna so that it doesn't touch anything… and the problem persisted. I then
looked into Tom W8JI's
Tom:
MOST antennas are in a neither world of being neither perfectly
balanced nor perfectly unbalanced.
How about an inverted L longer than 1/4 wave but optimized with series
capacitor? Any closer to perfect unbalanced?
Bob VE7BS
___
Topband
On 11/27/2012 10:45 PM, Tim Duffy K3LR wrote:
There is significant coupling between 160 meter antennas that are separated by
as much as 500 feet
YES!
and this coupling could be problem for your set up.
But it can also be a good thing if you know what you have and how to
take advantage of
On 11/28/2012 10:14 AM, Ashton Lee wrote:
I rebuilt the antenna from new wire, built a two insulator termination at the
end of the horizontal section where the high voltage is,
One thing I observed here several years ago with a dipole with an end
touching tree branches is arcing to the
W8JI solved another problem and saved someone much time and frustration.
I'd like to thank Tom for the great help and knowledge he has imparted in
me and many, many others over the years.
In my expert opinion as an engineer he is one of just a very small number
of super engineers I know.
Dave
I second that! Being acquainted with Tom over the years and reading his
informative posts has wonderfully enriched my enjoyment of radio. :-)
73, Mike
www.w0btu.com
On Wed, Nov 28, 2012 at 1:56 PM, DAVID CUTHBERT telegraph...@gmail.comwrote:
W8JI solved another problem and saved someone much
The change in an overheating core has a swing to it and you can watch the
SWR change, in a continuous fashion, while you are transmitting, while arcs
exhibit sudden change.
What you call imbalance was on purpose, but true. The more the radiating
length of an antenna is shortened, the more severe
On 11/28/2012 1:14 PM, Ashton Lee wrote:
I don't know why the issue only showed up on a single antenna of the
many I have fed through that device. But it did.
Simply because the ratio of voltage varies along the feedline if the
SWR is anything other than a perfect 1:1. The feedline length and
-Jeff
From: Tom W8JI w...@w8ji.com
To: Jeff Woods jmwoo...@yahoo.com; Ashton Lee ashton.r@hotmail.com;
topband@contesting.com
Sent: Wednesday, November 28, 2012 11:30 AM
Subject: Re: Topband: Inverted L SWR Jumps ???
Remove the balun. It's not doing
Tom:
MOST antennas are in a neither world of being neither perfectly
balanced nor perfectly unbalanced.
How about an inverted L longer than 1/4 wave but optimized with series
capacitor? Any closer to perfect unbalanced?
Bob VE7BS
Hi Bob,
Take the case of a 1/4 wave groundplane with four
So I am trying to get set up better on 160 meters. I now have two antennas up
(pretty well separated). One is an Alpha Delta DX A sloper hung in a tree with
a grounding wire led to a ground rod and small radial field. The other is an
inverted L on a good radial system of about 2000 feet in
could be problem for your set up.
73,
Tim K3LR
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Ashton
Lee
Sent: Tuesday, November 27, 2012 11:49 PM
To: topband@contesting.com
Subject: Topband: Inverted L SWR Jumps ???
So I am trying to get set up
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