Lew,
I'm thinking that the close spacing between each tree and each vertical is
absorbing a significant amount of signal. How much I don't know.
If it is clear between the two trees I could see stringing a rope between
the two trees and putting up an Inverted-L or a T right between the trees.
The antenna now has 90' to the nearest tree.
Dave WX7G
On Mon, Nov 2, 2009 at 11:41 PM, Lew Sayre <w7ew@arrl.net> wrote:
> TopBanders,
> While trying to attract SV3RF's attention last night on Top band it
> occurred to me that I need more efficiency in my Tx system.
> What I have is two fir trees, each about 110' tall and 189' apart. I have 2
> 12GA copper stranded wires going up and over the top of
> each tree with about 18' of wire going from vertical to horozontal as it
> goes over the top. I have 60 1/4 wave radials under each wire
> on the rocky ground that runs through essentially forest which surrounds
> these two trees with a bunch of other fir trees. I layed down
> radials under each wire until I saw no further change in the SWR in each
> vertical wire. The SWR individually for each wire is about 1:1.5 at 1830
> so I've used no matching system.
> I have a COMTEK Box that I use where I do see some F/B when working
> Oceania and EU...but not much..pretty subjective when the max gain might be
> 3 dB.
> I also suspect that all the fool trees around me knock down the signal
> some...but no real idea of how much.
> Question: You think changing from the inverted L configuration to an angled
> wire at about 60 degrees for the full 128' length would make any
> improvement
> in efficiency? Would angling the wire toward EU help or hurt the signal in
> that direction?
> When the tower fairy comes some day and erects a 190' tower in my
> woods, then maybe I can make a K3LR type array..but until then any
> suggestions for the current lash-up to make it radiate better?
> 73 and I remain,
> Lew W7EW/W7AT
> _______________________________________________
> 160 meters is a serious band, it should be treated with respect. - TF4M
>
_______________________________________________
160 meters is a serious band, it should be treated with respect. - TF4M
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