On 2022-12-02 11:01 AM, Jorge Diez - CX6VM wrote:
> how can you measure that a radial system is still good over the years?
Do like the (LF/MF) broadcasters (or at least what they used to do) ...
measure field strength at several few points when the antenna/radial
system is new, then measure at the same points every year or two.
An amateur could get away with wo or three points ... If I were that
concerned, I'd pick four points: 1 mile/1 km N, E, S & W of the
antenna.
73,
... Joe, W4TV
On 2022-12-02 11:01 AM, Jorge Diez - CX6VM wrote:
OK thanks Paul
how can you measure that a radial system is still good over the years?
Maybe the cable is degraded, or is cutted in some points if animals are
around.
Is any easy way to determine that the radial system on a vertical antenna
is still good?
thanks!
Jorge
CX6VM/CW5W
El vie, 2 dic 2022 a las 12:06, Paul Christensen (<w9ac@arrl.net>) escribió:
Jorge,
N6LF's material is based largely on measured results in support of
theory.
Paul, W9AC
-----Original Message-----
From: TowerTalk <towertalk-bounces@contesting.com> On Behalf Of Jorge
Diez - CX6VM
Sent: Friday, December 2, 2022 9:57 AM
To: Paul Christensen <w9ac@arrl.net>
Cc: Ignacy Misztal <no9e@arrl.net>; tower and HF Antenna Construction
Topics. <towertalk@contesting.com>
Subject: Re: [TowerTalk] 16om vertical and the number of radials
I think Paul wants to know the "real" situation, not theory. He want to
know if the theory is 100% in accordance with real big stations with many
radials on the antennas
73,
Jorge
CX6VM/CW5W
El vie, 2 dic 2022 a las 11:50, Paul Christensen (<w9ac@arrl.net>)
escribió:
Ignacy,
There's a lot of published information that addresses your question.
Some material is rooted in commercial applications and even more in
the amateur literature where modeling is compared with measured results.
As a starting point, I would carefully read Rudy Stevens' material:
https://www.antennasbyn6lf.com/design_of_radial_ground_systems/
Paul, W9AC
-----Original Message-----
From: TowerTalk <towertalk-bounces@contesting.com> On Behalf Of Ignacy
Misztal
Sent: Friday, December 2, 2022 9:25 AM
To: tower and HF Antenna Construction Topics.
<towertalk@contesting.com>
Subject: [TowerTalk] 16om vertical and the number of radials
Do more radials on a 160m vertical bring more improvements than shown
by simulation?
Most simulations show that going above 32 radials on 160m brings
minimal improvement, say 1 db to 2 max. Even for low angle signals.
On the other hand, some really loud stations n 160m, say 5-10 db above
the crowd, use a massive amount of radials. This is for inland
stations, far away from salt water.
Is there any discrepancy between modeling and real life performance
with the number of radials? Does adding radials beyond 32 help much?
Any real stories?
Ignacy NO9E
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