This decoupling
loop is sometimes mistaken for a matching balun.
We'll just call
it a choke and not put everyone to sleep with a long discussion of antenna
theory.
Just a few points on this topic.. Adding a choke
like this is a good habit to get into.
Another idea for this is
one of those plastic snap-on ferrite cores.
They come in
different sizes depending on the size coax used. Either way is up to
you.
This J-pole is a balanced antenna going into an unbalanced
feed line and can cause RF
to get back into the Rig and into the
shack. Save your equipment and try to protect yourself...
This is
easy to do.. So, take this extra step.. Please be
safe..
Surprisingly, the 18 gauge wire in this ladder line is very
rugged.
It's good to keep some open space between the tip of the
antenna and whatever you decide
to hang it from. Try not to place
the antenna close to any metal objects as well.
We hang ours
from some string thrown over a tree branch. Good to get the antenna
at least
10 feet off the ground. And, remember height determines
range at 2 meters.
The gain for a 1/2 wave J-pole is
approxmitately 2.4 dbi over a 1/4 wave whip.
Not bad for only a few
bucks.
Email
Steve for more details if needed. buck0 AT
comcast.net
Visit the original project with much more
detail.
