John
Looking at your layout on Google Earth.
It looks like you have space to run radials� at least 100' to the north,
north east and northwest and southwest I would start there Then I would
make friends with whoever owns the pastures to the east and west and see
if they will� let you bury some wire right after the next time they mow
the or cut hay from the field . Your only talking 50' into each pasture
and burying the wires 2" will put them out of harms way the next time
they run the bailing machine through there or run cattle on the
property. Your only "blind spot" then is to the south and south east
towards the house.
As� Jim noted and has been discussed on here several times radials
crossing each other is generally not a problem with ground mounted
radials. running the radials out from the base of the tower is the goal
. Depending on the type of metal fence you may even experiment with
bonding radials to the base of the wire fence. The risk is if the
sections of fence are not well bonded to each other then there is the
risk of noise
Dave
NR1DX
On 12/24/2020 5:21 PM, w5jmw@towerfarm.net wrote:
Jim,what about the crossing of the radials.Isn't doing that not
recommended?Right now I can do either.I am confined to such a pattern
due to me antenna placement.I have a overhead power run alomg my east
fence and a metel fence along my west.I have already attached to both
as a ground.really more of a lightning dispersal path.I might point
out that I do have pretty good soil.I have very dense clay in certain
at abt 3-4 foot.It does stop water sippage to a point.Also we have an
aerobic septic system which the spray nozzles are located in thi same
pasture...thank you,john
On 2020-12-24 13:52, Jim Brown wrote:
On 12/24/2020 1:56 AM, w5jmw@towerfarm.net wrote:
What I am wanting to do ie to run radials from corner to corner.That
is to say from ne to sw and from nw to south east.Initially run
these then go from side to side.The radials will be jouned in the
middla by a split bolt to a ground rod....I plan on using the radial
for all the antennas if possible.My question...First Can I do this ?
The short answer is that this is a very bad idea. The earth is a big
resistor, and if the antenna sees it, it burns a lot of the
transmitter power. Radials or a counterpoise provide a low resistance
return path for the antenna current; radials, in addition, shield the
antenna's field from the lossy earth.
An antenna's field surrounds it on all sides, and for radials to be
effective, they must extend out from the base, and be connected to the
coax shield. An earth connection (ground rod) does NOT make a transmit
antenna work better unless it's to an expanse of salt water.
Radial systems work best if they are symmetrical and dense, but if
available real estate and antenna locations prevent that, the best
layout for on-ground radials is to run as many as you can in as many
directions as you can. There is no need for on-ground radials to be of
equal length. There are many practical ideas about this in a tutorial
talk I've done at ham conventions and club meetings. Slides are here.
No original work by me, but a collection of great work by others.
http://k9yc.com/160MPacificon.pdf
73, Jim K9YC
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