On Sat, 26 Mar 2005 21:22:09 -0500, Vinnie S.
wrote in :

Anybody have one? I am going to stick it in a tree. There are tuning rings on
it. Anyone ever tune one of these? I am going at it alone when I install it. I
am going to use a climbing tree stand, and it will be impossible to tune it when
it is hung. If I tune it on the ground, will the SWR be drastically affected if
it is a couple feet off the ground, as opposed to when it is about 30 feet up?


Can't say specifically for the 2000. For a 1/2-wave vertical dipole,
the input impedance is highest (around 100 ohms) when the feedpoint is
1/4-wave above the ground (as low as it can go without digging a
hole). It is lowest (about 70 ohms) when the feedpoint is 1/2-wave
above ground. As you get higher the input impedance levels off to
slightly above the average impedance of a horizontal dipole (the
latter being about 73 ohms). Turning the antenna horizontally won't
work because it will then behave like a horizontal dipole, the input
impedance dropping towards zero as you get closer to the ground.

IOW, if you tune it on the ground, the SWR -will- change after you get
it up the tree -- and that's disregarding any effect the tree will
have on it's impedance.







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