T31A has been com ing in for several hours the last couple of nights with
booming signals even louder than the continuous lightning crashes from the
midwest storms listening to the pileups there are a lot of loud
signals from stations all over the country calling them
- Original Message -
From: Michael Tope w...@dellroy.com
To: topband@contesting.com
Sent: Tuesday, April 26, 2011 2:33 AM
Subject: Re: Topband: 160 metre vertical with 'top loading'
On 4/25/2011 7:08 PM, k...@optimum.net wrote:
I do not want to start the argument all over again. One
W4EF writes:
My suspicion is that some taper does occur in air wound loading coils at
HF frequencies, but that the amount of taper doesn't follow the simple
rule that it equals the amount of taper that would occur in the length
of straight radiator replaced by the inductor. I think the degree
April 26th,
2011
Hi Mike,
Thanx so much for your schematic, W0BTU Bi-Directional Beverage
Antenna on your updated Beverage web page, www.w0btu.com.
Your page is the most comprehensive document on the subject,
all in one
Experts needed,
I am using an old Create vertical mounted 20 feet above ground with about 60
radials of various lenghts. I removed the original Create 40 meter trap because
it usually spit fire and extended the vertical to about 40 feet long. At about
33 feet I come off to a large homebrew
Tree said:
One thing to think about in this discussion - is where the current goes
as it diminishes as you work your way along a 1/4 wave wire (let's not
bring the inductor into it just now for this discussion). I have never
really thought about this - but one of our signal integrity engineers
This subject comes up often. That should be no surprise. It's very
important to those who need to load shortened monopoles, and there is a great
deal
of conflict in the available literature on the subject. The same seems to
be true of conventional wisdom, as one might expect. Some of us
A pair of government surplus Polyphase IS-50 protectors came my way recently
and I'd like to use them on my 160M verticals to replace what I currently
use. They are exactly alike in appearance to the IS-B50LU and similar, but
a test reveals they have DC continuity. I can find nothing in
Long before we were using RF to communicate very far Tesla had it all
right there..
http://www.magnetricity.com/NeoG/Bifilar.php
Nikola Tesla explains that a standard coil of 1000 turns with a
potential of 100 volts across it will have a difference of 0.1 volt
between turns. A similar
-Original Message-
One thing to think about in this discussion - is where the
current goes
as it diminishes as you work your way along a 1/4 wave wire
(let's not bring the inductor into it just now for this
discussion). I have never really thought about this - but
one of our
W4EF writes:
I agree. Clearly the current can vary a long the length of an
air-wound
inductor. If it didn't vary at all, then a helically wound
vertical
antenna element would not have a current taper. I don't think
that has
ever been in question. I think the real question that has
It would be of some considerable use to know exactly what you
summarize in saying:
On Tue, Apr 26, 2011 at 9:28 PM, k...@optimum.net wrote:
I tried to use toroid as loading inductance, but it did not work well.
I can guess what didn't work well, but I would rather hear your details.
73, Guy.
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