"Jerry Martes" wrote in message
news:aqSpi.3837$7w.79@trnddc05...



Hi Jerry,
I posted the drawing on another newsgroup called
alt.binaires.schematics.electronic
Not all ISPs carry binairy files so maybe you can't see it, if your
address is good I'll
email the drawing.
I looked at the site and it discouraged me. One site says 34mm diameter
tube another
42mm, one says a 71mm impedance match strip then another says it's
longer. I have no
way to measure the antenna when finished so I'd like to at least start
with the right
dimensions. I will say at least the site you gave does have some
equipment and his
measurements and reasoning make sense.
What is a bridge? I plan on putting a Usb wifi adapter at the antenna.
I hope to remove the smt antenna on the USB wifi card and attach the
helical antenna.
Thanks, Mike


Hi Mike

I am too much 'a beginner' to be a good advisor for how to hook up
devices for WiFi reception. So, I wont try to define what a Bridge is.
I will do about anything (affordable) that allows the elimination of the
coax in a 2.4 GHz system.
I do have some experience with making WiFi systems to extend the distance
at which Internet connections can be achieved. On one system I made for
a guy in Ranchita Calif, who has an agricultural business about 1/4 mile
from his house. I put an access point on a 4 foot diameter dish so he
uses only CAT 5 cable from his home Router to illuminate the dish. I then
put a Bridge on a smaller dish with CAT 5 cable to connect that dish to
his lap top in the field. It worked. My objective was to be able to
use highly directive antennas yet minimize coax line losses.
I think the use of a USB wireless adapter (TRENDnet TEW-445UB) Would be
easier than the way I made my system. Show Me cables sells reversing
polarity adapters that make it possible to use normal SMA connectors to
the TRENDnet USB TEW-445UB

Your project interests me. Tell me what you finally decide to do.
I have rejected the Helix. They are more difficult for me to
understand than a Yagi. The Helix is circularly polarized, so you loose
3 dB "off the top" of any gain (directivity) plots. The Yagi is fairly
easy to model with EZNEC, so you can be fairly well assured that whatever
you build will work like the model.

Jerry
Jerry, I was thinking you would come back and say a bridge is the same as a
usb wifi adapter, but I guess not. Have you looked at my drawing I sent
you?
Mike