Hi Alex,
We use vertical loops here. The trees don't affect them much. I can walk up
to my loop and watch the RF current meter and not see any change until I get
closer than 1 foot from the loop and then it drops a little. They work nice
with all my trees in my yard.
73's,
Mike>WE0H
http://www.we0h.us/lf.html
-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Alexander S. Yurkov
Sent: Friday, November 15, 2002 4:23 AM
To: '[email protected]'
Subject: Re: LF: RE: Re: RE: Loop vs Marconi
Hi, Group.
On Thu, 14 Nov 2002, Ashlock,William wrote:
>A canopy of trees will also effect a loop antenna, try a 50 ft vertical
and
>gain 6dbs and you will probably still be on the plus side even with some
>attenuation from the trees.
You sir, are absolutely WRONG!
A spent 100s of hours on my vertical antennas before changing over to
loops.
It seems to me a loop (if wire diameter is large) may be bit better
then vertical of same dimension if there are lot of enviroment losses
(many trees and so on). Loop should be less sensetive to enviroment then
vertical. But in clear space vertical should be better.
Generally by increasing wire diameter one can increase loop
effectivity. Unfortutenly You can't increse vertical effectivity in such a
way.
Any way comprehensive study of the problem (vertical versus loop) seems
to be very worth and interesting. But this require lot of work both
experimental as theoretical.
Hoprisontal loop can not be effective because it will produce strong
current in the ground and loss should be hight.
73 de RA9MB/Alex
http://www.qsl.net/ra9mb
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