On Tue, 13 Mar 2007 11:15:55 -0400, Buck
wrote:

I have a situation where I would like to install a vertical wire above
a fiberglass pole I have in the center of the yard. However, I must
keep the coax off the ground so I can only feed it about 7 feet from
the ground so people and the mower can get underneath. (rental
property).

I want to setup a 20 or 30 meter vertical and run ground radials from
the base of the pole where the wires can be buried. Is it possible to
feed the antenna above the ground plane? for example, I have ground
radials connected to a seven foot vertical wire, the shield side, and
the center side of the coax would continue upwards to the top, or
appropriate height on the pole.

Thanks
Buck
N4PGW

It sounds workable but the feed impedance is pretty high.
You might match 20 meter operation with a quarter wave feeder.
You could also mount a 20 meter ground plane at 7 feet off the ground.

John Ferrell W8CCW
"Life is easier if you learn to
plow around the stumps"

On Tue, 13 Mar 2007 18:23:18 GMT, John Ferrell
wrote:



It sounds workable but the feed impedance is pretty high.
You might match 20 meter operation with a quarter wave feeder.
You could also mount a 20 meter ground plane at 7 feet off the ground.

John Ferrell W8CCW

I wish I could, The reason the coax con come across is that it goes
directly to the house, the radials would have to be spread out over
the common-area property. I can bury the radials, but not the coax.
The mower folk will run over it without thinking if it is on the
ground, but the radials can be carried out of the way.

Buck
n4pgw
www.lumpuckeroo.com

--
73 for now
Buck, N4PGW
www.lumpuckeroo.com
N4PGW

I've had a chunk of RG-213 running across my back lawn for 5 years or
so. It was laid on, but has gradually been absorbed by the grass. From day one
it has never even come close to the lawnmower blade and I keep my grass
fairly short. The same with radial wires! Consider giving it a shot.

Irv VE6BP

Buck wrote:


The mower folk will run over it without thinking if it is on the
ground, but the radials can be carried out of the way.


--
--------------------------------------
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--------------------
Irv Finkleman,
Grampa/Ex-Navy/Old Fart/Ham Radio VE6BP
Calgary, Alberta, Canada

Irv Finkleman wrote:
I've had a chunk of RG-213 running across my back lawn for 5 years or
so. It was laid on, but has gradually been absorbed by the grass. From day one
it has never even come close to the lawnmower blade and I keep my grass
fairly short. The same with radial wires! Consider giving it a shot.

Irv VE6BP

Buck wrote:


The mower folk will run over it without thinking if it is on the
ground, but the radials can be carried out of the way.

I cut a small trench with a weed eater and put my RG-8 line in that,
held in with some galvanized fence wire cut to about a foot long and
bent into a "U" shape, one "U" every three feet or so. After five years
I have a hard time finding it, let alone cutting it with the lawn mower,
give that a try!

73,
W8LNA

I hear that RG-8 shouldn't be buried, but if not, the reason for the
problem is the hired help with the mower people. They either will
chop it up or won't cut near it and complain to the land lord. He
hasn't complained about what we have so far, so I am keeping it low
key until we can find a better, ham-friendly place in which to move.

Thank you,
Buck
N4pgw


On Tue, 13 Mar 2007 19:44:02 GMT, Irv Finkleman
wrote:

I've had a chunk of RG-213 running across my back lawn for 5 years or
so. It was laid on, but has gradually been absorbed by the grass. From day one
it has never even come close to the lawnmower blade and I keep my grass
fairly short. The same with radial wires! Consider giving it a shot.

Irv VE6BP

Buck wrote:


The mower folk will run over it without thinking if it is on the
ground, but the radials can be carried out of the way.


--
73 for now
Buck, N4PGW
www.lumpuckeroo.com
N4PGW

"Buck" wrote in message
...
I hear that RG-8 shouldn't be buried, but if not, the reason for the
problem is the hired help with the mower people. They either will
chop it up or won't cut near it and complain to the land lord. He
hasn't complained about what we have so far, so I am keeping it low
key until we can find a better, ham-friendly place in which to move.

Thank you,
Buck
N4pgw


On Tue, 13 Mar 2007 19:44:02 GMT, Irv Finkleman
wrote:

I've had a chunk of RG-213 running across my back lawn for 5 years or
so. It was laid on, but has gradually been absorbed by the grass. From
day one
it has never even come close to the lawnmower blade and I keep my grass
fairly short. The same with radial wires! Consider giving it a shot.

Irv VE6BP

Buck wrote:


The mower folk will run over it without thinking if it is on the
ground, but the radials can be carried out of the way.


--
73 for now
Buck, N4PGW

Hi Buck

Are you interested in experimenting? I would have tried something like
this ----

Run the RG-8 from the "building" to the monopole parallel to the ground
and 7 feet above it. Drop it down parallel to the monopole a few inches
from it all the way to the ground. At the ground, connect the coax the
same way a conventional monopole is connected.

Any low loss, high dielectric constant, material in the immediate vicinity
of the parallel coax and monopole will help. A coiled coax type "balun"
at the antenna end of the horizontal coax will really be needed too.

I have no idea if you want to "play" with antenna ideas. And, I have no
certainty that the antenna would work anyway.

Jerry

On Wed, 14 Mar 2007 16:42:23 GMT, "Jerry Martes"
wrote:


"Buck" wrote in message
.. .
I hear that RG-8 shouldn't be buried, but if not, the reason for the
problem is the hired help with the mower people. They either will
chop it up or won't cut near it and complain to the land lord. He
hasn't complained about what we have so far, so I am keeping it low
key until we can find a better, ham-friendly place in which to move.

Thank you,
Buck
N4pgw


On Tue, 13 Mar 2007 19:44:02 GMT, Irv Finkleman
wrote:

I've had a chunk of RG-213 running across my back lawn for 5 years or
so. It was laid on, but has gradually been absorbed by the grass. From
day one
it has never even come close to the lawnmower blade and I keep my grass
fairly short. The same with radial wires! Consider giving it a shot.

Irv VE6BP

Buck wrote:


The mower folk will run over it without thinking if it is on the
ground, but the radials can be carried out of the way.


--
73 for now
Buck, N4PGW

Hi Buck

Are you interested in experimenting? I would have tried something like
this ----

Run the RG-8 from the "building" to the monopole parallel to the ground
and 7 feet above it. Drop it down parallel to the monopole a few inches
from it all the way to the ground. At the ground, connect the coax the
same way a conventional monopole is connected.

Any low loss, high dielectric constant, material in the immediate vicinity
of the parallel coax and monopole will help. A coiled coax type "balun"
at the antenna end of the horizontal coax will really be needed too.

I have no idea if you want to "play" with antenna ideas. And, I have no
certainty that the antenna would work anyway.

Jerry

That is definitely an idea to consider. I will have about four to six
inches it'll be away from the vertical.

Buck
n4pgw

--
73 for now
Buck, N4PGW
www.lumpuckeroo.com
N4PGW

I hear that RG-8 shouldn't be buried, but if not, the reason for the
problem is the hired help with the mower people. They either will
chop it up or won't cut near it and complain to the land lord. He
hasn't complained about what we have so far, so I am keeping it low
key until we can find a better, ham-friendly place in which to move.


If you're only operating on HF, 100 watts or less, and your feedline runs
are of moderate length, or less, you could probabaly get by with the
smaller and inexpensive RG-58.... or RG-8X if you're loss conscious.
Either way, you could enclose it in cheap PVC, as small in diameter as you
can get and still get the coax through it. The electrical gray stuff would
not only be less noticable, but is pretty tough. Groundskeeper weedeaters
shouldn't bother it if they hit it.

... just a thought.


Ed K7AAT