On Sun, 07 Aug 2005 16:22:35 GMT, Tony Hwang <dragon40@shaw.ca> wrote:

>What is different? Higher gain = more element = narrower beam angle.

What's different is that this is only true for a single class of
antenna such as a yagi. For a given gain, different classes of
antennas (panel, patch, planar, biquad, dish, coffee can, etc) have
different beamwidths.

You also threw the front to back ratio into the puzzle, which has
absolutely nothing to do with the number of elements or the gain.

>Used work in microwave, troposcatter, sattelite comm systems when I was
>young.

I'm 57 and still somewhat young. I used to design, repair, sell, and
install the stuff. Now days, I just fix computers, play consultant,
and answer questions in newsgroups.

>Talking from experience with plain language.

You call this plain language?
"Think LOS(ling of sight). Radio wave LOS is not as straight as
visual LOS tho."
It's just plain wrong. Microwave line of sight is a straight line
unless you want to play over the horizon, ducting, or knife edge
diffraction. For the distances and frequencies involved in 802.11,
it's a straight line. How will your plain language answer help the
original poster with his antenna selection question?

>Want to go in detail in
>antenna theory? Then please do via email direct.

No thanks. I answer questions in newsgroups and mailing lists for
free. Everyone learns from answers via usenet. Only the people
involved learn from an email exchange. The questions that come via
email, I cosider to be billable consulting. I charge $75/hr and it
typically takes about an hour per question.

>Tony, VE6CGX
>BSEE, class of '66

Jeff, AE6KS (formerly WB6SSY)
BSEE. Cal Poly, Pomona CA 1971.


--
Jeff Liebermann jeffl@comix.santa-cruz.ca.us
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
AE6KS 831-336-2558