On Sep 11, 2:05*pm, wrote:
Art Unwin wrote:
On Sep 10, 10:05?pm, wrote:
Art Unwin wrote:
On Sep 10, 8:45?pm, wrote:
Art Unwin wrote:
What is the main factor that prevents HF radiation from focussing
for extra gain?

Money.

If you can afford to build a 20m parabola about 2,000 feet in diameter
and the place to mount it, you'll get lots of gain.

--
Jim Pennino

Remove .spam.sux to reply.

Then are you saying it is the antenna size that is the main factor?.

Of course.

Everyone knows the gain of a parabola is directly proportional to
the size in wavelengths, or:

Not so!,

Well, yes, I guess that's true as only those with an education in
electromagnetics would know that.

So I doubt many participants in rec.folk-dancing would know that, but
this isn't rec.folk-dancing, though some posters here do seem to dance
around a lot.

--
Jim Pennino

Remove .spam.sux to reply.

Yes Jim. Unless one accepts the weak force for what it is, what
creaates it
and what it does for overall vector angles discussion is moot. For
instance
the emmitter cannot be parallel to the axis of the reflector, it must
be tilted
per the recognition of the weak force otherwise the mathematic and
symbols such as
equal or zero are meaningless. You must begin with symetry or
equilibrium.
You surely must know Jim that many hams do not have an understanding
of
electromagnetics only on how a microphone is used or a particular part
of ham
radio where their interests are,
The hobby is all inclusive and where one expertise does not
necessarilly spill over to the other
except only in the eyes of the speaker