"Buck" wrote in message
...
On Sun, 30 Jan 2005 03:09:54 GMT, "
wrote:


snipArt


It appeared to me that you were looking for that lower lobe, not the
higher one when the band opens. The longer the beam, the narrower its
pattern is, and like better the rejection from other directions (f/b,
f/s rejection, etc. I took that as an understood.) )While answering
both you and in part, Roy,)

from the OP:
Fact is that most long distance signals on 20 metres come in at angles
of 11 degrees or less where as the 'normal' antenna has a TOA of around
14 degrees.
end quote.

I was under the impression that you felt a need for designers to find
a lower TOA. closer to ten or eleven degrees.

Yes, that is exactly what I said and what I mean.We need to get away from
the long boom high gain aproach which cannot be used in many places and
look at other aproaches to getting a lower lobe trajectory with a small
turning radius.
Some will say that is impossible where as I would say it is possible when
open minds
are turned to the task.
Just think of what I could be describing, a 20 metre antenna with a
ten to eleven degree TOA, turning radius of a conventional dipole and a
feed point
of something less than 75 foot high. Now thats good for small real estate
and a light duty rotor
tho the U.K. authority may baulk at the height. I have built very long boom
yagi.s. for 20 M
some with a couple of reflectors and some with as many as 13 elements but
this direction is limited
by minimal advances compared to complexity, thus my statement as to what the
hobby needs
for it to grow
Regards
Art KB9MZ........XG




I am confused, there
can be no doubt of that in your minds at this point I am sure . I
do realize that at least in a yagi, as you increase the forward gain
(f/b and s/b ratios), generally by adding elements that it narrows the
forward lobe horizontally and vertically. A 150 foot boom (say 20
elements for example) beam might be perfect for picking up the lower
angle, which is what I thought you were looking for. The three
element beam will bring in higher angle signals as the lobe will have
a higher angle. A dipole will likely have even a higher, possibly a
NVIS angle. As for being quieter, I didn't define it but I mentioned
that the N4GG antenna was much quieter than my dipoles. It also has a
low angle of radiation, which fits very well with what you and Roy are
telling me. It doesn't have a high gain, in fact the designer doesn't
even try to calculate it except to say it is a little higher than a
dipole. He also said it was designed for the DX and not to expect to
chat with many nearby stations.

For a small real estate layout, I imagine that the N4GG can be used
with a dipole or small beam for continuous DX operation. Of course
the N4GG antenna is larger than a dipole. It is one wave long and has
quarter wave legs hanging off it.

... from the OP
I believe it is time for antenna designers to concentrate less on
obtaining gain and instead concentrate more on lowering the TOA.
without the need of excessive real estate requirements.

Are you looking for a small antenna that will pick up the DX before
the other DX hounds start piling up?


--
Buck
N4PGW