...@contesting.com] On Behalf Of Carl
Sent: Friday, February 14, 2014 10:46 AM
To: Tom W8JI
Cc: topband@contesting.com
Subject: Re: Topband: Question - optimum number of radials
While Tom touched on the subject yesterday the subject of an individuals
ground conductivity has to be stressed, continuously
f Bill
Cromwell
Sent: Friday, February 14, 2014 10:02 AM
To: topband@contesting.com
Subject: Re: Topband: Question - optimum number of radials
On 02/14/2014 09:15 AM, Charlie Cunningham wrote:
> That's a lot of good information, Richard! Thanks for sharing!
>
> 73,
> Charlie, K4OTV
While Tom touched on the subject yesterday the subject of an individuals
ground conductivity has to be stressed, continuously it seems. The FCC maps
arent perfect and hams usually dont have the options of perfect siting for
their verticals as do many of the BC stations.
Home developers often r
Besides "optimim number(s)," I wonder if there is supporting analysis for the
connection of the radial ends??
I have around 80 elevated radials that range from 50 foot lengths, running east
and west, and 25 foot lengths running north and south (all of that a function
of being geographically chal
On 02/14/2014 09:15 AM, Charlie Cunningham wrote:
That's a lot of good information, Richard! Thanks for sharing!
73,
Charlie, K4OTV
The whole topic of radials as it applies to me on my small lot is "put
in as many as you can". The same probably applies to others on small
lots. On top band I
That's a lot of good information, Richard! Thanks for sharing!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Richard
Fry
Sent: Friday, February 14, 2014 7:00 AM
To: topband@contesting.com
Subject: Re: Topband: Question - op
The r-f loss at the operating frequency in a set of buried radials varies
with the conductivity and permittivity of the earth in which they are
buried.
The NEC4.2 study below shows that for poor earth conditions (within about
1/2WL from the base of the monopole), the number and length of burie
For anyone interested in modeling a vertical with a variable number of radials
you might refer back to this post:
http://lists.contesting.com/archives//html/Topband/2013-04/msg00017.html
Near the bottom you'll find a link to download a ".weq" format model for use
with AutoEZ. AutoEZ requires M
Jerry Sevick, W2FMI, has an interesting comment about the "120" number in
his book, "The Short Vertical Antenna and Ground Radial." At the end of
the first chapter he notes:
"...it should be mentioned that the world standard for the number of
radials to be used with verticals in the AM broadcast
Jerry Sevick, W2FMI, has an interesting comment about the "120" number in
his book, "The Short Vertical Antenna and Ground Radial." At the end of
the first chapter he notes:
"...it should be mentioned that the world standard for the number of
radials to be used with verticals in the AM broadcast
I understand that 120 radials is the golden standard. At what point is there
no significant improvement?>>>
120 radials never was a gold standard.
The FCC said if a AM BC station uses something like 110 radials, I forget
the exact number, they can avoid doing a radial system proof of perfor
N6LF has done quite a bit of actual testing of various in ground and
elevated radial systems. See: http://www.antennasbyn6lf.com/
K3LC has done extensive modeling of both in ground and elevated
radial systems: http://www2.gcc.edu/dept/elee/Faculty/Christman.htm
However, if the majority of yo
w0btu.com/Optimum_number_of_ground_radials_vs_radial_length.html
Check the links on that page to N6LF, Rudy Severns' pages. His work has
been called the gold standard of radial science.
73, Mike
www.w0btu.com
On Thu, Feb 13, 2014 at 5:12 PM, DALE LONG wrote:
> I understand that 120 radials is
I understand that 120 radials is the golden standard. At what point is there
no significant improvement?
How much worse is 60 radials? How much worse is 24 radials (4 of 1/4 lambda
and 20 or 1/10 lambda)?
This may have been discussed in the past, but if there is any engineering
reference or
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