The comments in your first paragraph are very confusing, mixing up
information on different antennas, old or proposed, and parts data,
without clearly distinguishing what each comment refers to. I doubt
that anyone will be able to sort that out unless they went thru the
thread on QRZ.
https:/
I have never modelled an inductively-loaded Beverage, but my intuition
is that it will not perform any better than an unloaded wire of the same
physical length.
I haven't modeled for 10 years and even then I was in the dark.
I started on this quest when I saw this W8JI page about inductively
ZL3IX I think by accident had a fence with a break in it. My not
working Beverage was 4'up over a continuous welded wire fence. Then
some NEC2 modeling of a 600' Beverage 6' above a continuous 3 wire
(wires at 2,3, & 4') barb wire fence, showed poor F/B. Mine was worse
over the welded 6"x 6"
My own experience is that a fence does not degrade the Bev pattern too
much as long as the Bev is sufficiently high above the fence wire. I
mount my wires about 3 m above the fence.
I have never modelled an inductively-loaded Beverage, but my intuition
is that it will not perform any better th
As long as the fence is pointed in the right direction. :-)
www.w0btu.com/Beverage_antennas.html#Misc_Beverage_antenna_notes
On this page, there are some links to ZL3IX (?) experiences with his
Beverages mounted at different heights above metal fences.
73, Mike
www.w0btu.com
On Sat, Aug 24, 201
And, by the way, K5GN and W5KU report that their Beverage above a barbed
wire fence is the BEST Beverage at their place.
Chuck W5PR
On Sat, Aug 24, 2019 at 12:41 PM Chuck Dietz wrote:
> I seem to remember someone saying the modelling programs are unreliable
> when a wire is close to the ground.
Good point, Chuck! You are absolutely right. I would have modeled it above
the ground, at least at first.
73, Mike
www.w0btu.com
On Sat, Aug 24, 2019, 12:41 PM Chuck Dietz wrote:
> I seem to remember someone saying the modelling programs are unreliable
> when a wire is close to the ground. Also
I seem to remember someone saying the modelling programs are unreliable
when a wire is close to the ground. Also, there is really no way to model
the properties of "ground." It can vary in just a few feet and the moisture
content varies from day to day. I think this is a "try it" kind of antenna.
R
The trick is to take the dc control winding and it's inductance out
of the antenna circuit, which I think can be done with a large bypass
capacitor.
Here's a simple drawing.
The BOG goes to antenna in, through the .47uF cap (Xc=.67ohms at
500kHz, 0.1 ohm at 4Mhz) through variable inductor,
The only way to predict the RDF and pattern is by modeling it. I don't know
of anyone who has done this. I have a few of my .ez Beverage models in
w0btu.com/files/ as a starting point, but I don't think that I uploaded
everything there.
There are free antenna modeling programs out there. I have on
But what did you mean by "proper pattern"?
I should have said, the best pattern that adjusting the Inductive loads
will provide.
Yes, I understand the pattern changes with frequency. What I want to do
is inductively load the antenna,
so it will have the same pattern as if we increased the l
Lots of questions, maybe a little bit of useful answers from me.
First, I doubt there is any BOG that will cover 8 octaves with a useful
pattern. Unobtanium, IMO.
Second, your question did cause me to investigate improving the RDF of a
240' BOG which is on my to try list. So using EZNEC/Pro
Thank you for asking this, because I have always been fascinated with the
concept of loaded Beverages (either BOGs or shortened overhead).
But what did you mean by "proper pattern"? I assume that you mean "usable
pattern" and that realize that the pattern will change with frequency. See
for yourse
I want a BOG that will have a proper pattern over 500kHz to 4Mhz.
As I understand it,
"loaded Beverages show increased directivity because velocity of
propagation along the antenna is /*decreased*/."
I assume that is for antennas that are shorter than what is required for
that frequency.
I
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