I'm curious as to how you can have such a short lead to the ground
rod? It's more than 12" from my radios to the window. Doesn't the
ground wire connect to the ground connection on the radios?

Thanks,
Dan



On Wed, 21 Apr 2004 02:27:19 -0400, starman wrote:

Jim Williams wrote:

If I run a wire out the window to a tree near the house, do I also
need to run a ground wire to the ground outside?

Does an outside wire perform better if it's grounded or is it a safety
precaution (or both)?

It's mainly a safety issue, since you can't make a good RF signal ground
for the type of antenna you're considering (random wire or inverted-L),
*unless* you use the technique on the following website:

http://www.anarc.org/naswa/badx/ante...e_antenna.html

An RF signal ground needs to be short. Several feet of ground wire is
too much. That's why the grounding method on the website (above) works
so well. The ground wire to the rod is very short. Mine is about
12-inches.

Even if you're not interested in reducing noise with a good RF ground,
it's still a good idea to have some kind of ground for lightning or just
static electricity. I suggest you install a ground rod near the location
where the antenna wire comes inside the house. Connect a lightning
arrestor between the antenna lead wire and the rod. Better yet, build
the antenna design on the website above. This method helps to reduce
noise from domestic appliances such as televisions and computers.


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Dan Graves wrote:

I'm curious as to how you can have such a short lead to the ground
rod? It's more than 12" from my radios to the window. Doesn't the
ground wire connect to the ground connection on the radios?

Thanks,
Dan

The inverted-L antenna design we've been talking about uses a coax lead
which goes to a box near the ground rod. The coax doesn't go up to the
end of the antenna wire overhead. There is a single wire coming down
from one end of the horizontal section of the antenna to the matching
transformer, located in the box near the ground. This allows for a
really short ground wire from the box to the rod. That's why mine is
only 12-inches. Since the coax shield is grounded outside at the box and
rod, there isn't any need for a seperate ground wire to the receiver.
The receiver gets grounded by the coax shield where it connects to the
receiver's antenna input.


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