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Topic: way off topic wifi question (3 msgs / 84 lines)
1) From: Peter Zulkowski
Trying to extend the range for my laptop and am thinking about building 
a hi gain antenna.
This is a new experience, but all I can find is techniques for building 
a 1/4 wave antenna in a can.
Since a quarter wave is only about 1.21 inches, is there any reason one 
could not build a half, full, double or triple wave antenna?
See.. I am new at this, but to me, if it is only copper wire with a can 
around it, why not bigger?
Also, if I mount this thing on a mast, how far can I run a cable to it, 
and what kind of cable.
I want to set this up at a campground that has free wifi, but the signal 
ends somewhat far from my campsite.
Any help appreciated..
PeterZ
California is still greyed out, here in LHC

2) From: Aaron
Peter, give it a try BUT...  remember.  communication is a two way street.
You can build a hi gain antenna and 'hear' the signal all day but if you
are not putting enough power out to get back to the other side, then you
still won't communicate.  A bigger or 'more fractions' of a 'wave'
antenna might work, it might not.  You have things to worry about like
nodes, harmonics, possibly birdies,  just to name a few.  Tuning that
bugger is going to be fun as well.  Given you are in microwave range
freq wise, it's going to be very picky, and tends to be a bit
directional as well.  If you have line of site to where you need to
transmit to, have you considered a shotgun type antenna or perhaps a
dish tyep antenna.  or are you looking to boost the entire signal
through the whole camp.  You can run wire to it, Id recommend r/f wire,
you can get it at any cb shop, id recommend paying the few extra $$ for
the fully shielded cable, it will keep noise out of the line.  I believe
RG58U / coax like cable tv will work too.  You should be able to run 100
feet or so before you start getting real bad losses, but you can get a
line booster fairly cheap.
Aaron

3) From: Jim Mitchell
I run about a 1/2 mile 802.11G link between my Lab and the Boatyard - which 
isn't all that great a distance, but it's smack, dab in the middle of an 
industrial zone, and there's this great, whacking, steel bridge in the way.
I use two 20dBi gain parabolic dish antennas on either end of the circuit, 
along with a pair of Hawking 1W booster amps - in the middle of the link is 
a passive repeater consisting of two 8dBi square, 'patch' antennas connected 
with coax that allow the signal to turn 90 degrees under the bridge. This 
lashup works surprisingly well giving a real 15-20Mb throughput which is 
close to the 802.11 G specs.
There's a Hawking store which sells used and refurb gear at:http://www.gohawking.com/store/index.php?cPath$Which sometimes has these amps and their excellent little 15dBi corner horn 
antennas.
Cheers
Jim


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