[TowerTalk] Beverages and Trees
Thu, 9 Mar 2000 05:33:11 -0600
N4KG comments intersperced below.
On Wed, 08 Mar 2000 alsopb <email@example.com> writes:
> I was re-reading the ON4UN Low Band antenna handbook and ran across
> a statement I need more info on. This quote is from the section
> titled" Location of the Beverage"
> "Just as it is not recommended to put up vertically polarized
> antennas between tall trees, it is not a good idea to run a Beverage
>antenna through the woods"
Good thing my wires have not read that statement!
ALL of my Beverages run in the woods and I can
assure you I hear stations on them I cannot hear
on the transmit antennas or stations I can hear
on the transmit antennas have greatly improved
signal to noise ratios on the Beverages. N4KG
> Would somebody please explain this. It was my impression that trees
> are fairly transparent to RF at lower frequencies. What is the real
> effect and its magnitude?
The US Military used HF in Vietnam because VHF
would not penetrate the dense vegetation. N4KG
> What about the practice carried out by some of using galvanized
> staples to attached galvanized wire bevrages to tree supports? I see
> that even ON4UN attaches beverages to bamboo poles.
I use insulated stranded wire thrown over low branches
with a moderate weight. The biggest problem is repairing
broken wires after they catch falling dead branches. The
wires require constant maintenance. Stranded wire solders
nicely with a portable butane soldering iron. Number 16 or
18 stranded wire seems best. A "mechanical fuse" can be
implemented using smaller wire or string at the ends. It works
well on a couple of #14 solid copper wires runs that I have.
(Ran out of stranded wire and I had the insulated solid wire.
It's a bit heavy but works fine.) N4KG
> 73 de Brian/K3KO
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