RadioBanter - View Single Post

October 26th 04, 07:36 PM

wrote in message
news:vYcfd.314858$3l3.210855@attbi_s03...
...

May I also point out that if you allow elements to vary in diameter and
height and still keeping to
a .1 boom length, gain increases until ultimately the elements form a
combined parabolic shape
and progressively place rearward radiation energy into the forward direction
until the ultimate is reached,
where there is no radiation to the rear and F/B is absent. I would remind
you that the top element is
going to be designed to be disconnected and connected to ground to
determine impact on static noise.
It is also my intent to string nylon from one end of the elements to the
other, progresively tightening it
until a suitable bend or bow is put in place such that the beam width
narrows to somewhere in the
range of 30 degrees. (ala point to point to get highes gain together with a
lower take off angle)

I do have a fold over tower by the way over 1/2 acre of clear ground with
embedded wire screen
and I am surrouded by sloping farmland with Drummond soil..The 1 inch
hardline is routed undeground.
The above experimentation is why I have so much fun with antenna
experimenting where in other
ways the experts would say it is useless to try before I even put my shoes
on.

Regards
Art

Many years ago - before computer modeling -
I was talking with a fellow down under (VK or
ZL, I can't recall) who was experimenting with
parabolic elements. Like you, he was using
fishing line to achieve the shape.

Don't let banal criticism get under your skin...
not everyone feels secure when venturing to
the outer edge of the envelope g

73 de Chuck, WA7RAI