On Sun, 13 Feb 2005 16:29:47 +0000 (UTC), "Jeff Mowatt"
<(E-Mail Removed)> wrote:
>I installed a netgear FWAG114 hotspot in my loft with the aim of reaching
>neighbouring buildings within 100m
>Surprisingly I have managed to connect indoors on all floors, which I don't
>need to do but the signal just outside is very weak. The building itself,
>constructed circa 1860 is solid stone with walls up to 18" thick and I'm
>wondering whether this is the major factor affecting transmission. There
>shouldn't be much interference as I'm in a valley where cell phones don't
>operate.
Cell phones are not an issue because they're on different frequencies.
Brick and stone are serious attenuators at 2.4Ghz. They will
literally block the signal completely. This article may help explain:
http://www.wi-fiplanet.com/tutorials...le.php/1431101
18" of solid stone is good for about 12dB attenuation (or more). To
put that in perspective, you're power gets cut in half for every 3dB
of attenuation, and your range gets cut in half for every 6dB of
attenuation. The wall will cut your range to 1/4th or less.
>I'm wondering as I don't have access to the other buildings right now,
>whether it might be better a little further from the house where these walls
>don't fall in the "line of sight".
YES! Since you can't move the walls or drill through them, moving the
radios to some approximation of line of sight will be a minimum
requirement. A better antenna (or antennas) will also be a huge help.
>Otherwise I might well need a wap with a
>dipole antenna for all round coverage, perhaps if not some building to
>building bridges in some cases. I'm try to work out if that's going to be
>economically viable.
Replacement antennas are common. Netgear supplies two antennas that
my guess would be about 2dBi gain.
http://www.netgear.com/products/details/FWAG114.php
I suggest you leave one antenna in place to deal with local
conenctions, and attach an external panel antenna pointed in the
direction of the remote user in question. However, make sure your
coax cable runs are as short as possible, and that you have line of
sight to between the user and the panel antenna:
http://www.fab-corp.com/J1.htm
>A quick question. Though I can't seem to find any specific information, are
>all 802.11g devices compatible in that I might use equipment from other
>manufacturers to propagate my signal? I'm thinking CISCO which according to
>the Cisco logo on my Netgear box, is from the same stable and they have some
>reasonab;y priced equipment in comparison.
In general, everything that's claimed to be 802.11g will talk to each
other. However, the exceptions are a problem.
1. There are 802.11g enhancements such as Super-G, Turbot-G, and
Afterburner, that are not universally compatible.
2. Repeaters and WDS bridges are always a problem. The standards are
not terribly clear and implimentations vary. Some manufacturers have
repeaters that don't even talk to their own hardware due to different
chipsets being used. I assume this is what you mean by "propogate"
the signal.
Are you thinking of a wireless repeater or WDS bridge? If so you need
to make sure the manufactory support the product or at least the
chipset used in the FWAG114. I can't tell from the insipid Netgear
data sheet if it supports WDS. If so, methinks that's your best bet
if you can find a WDS access point to act as a repeater through a hole
in the wall. I'm not a big fan of repeaters and WDS bridges, but they
do work. Methinks antennas and location are more important and
useful. Here's more than you wanted to know about WDS:
http://www.proxim.com/support/techbulletins/TB-046.pdf
--
Jeff Liebermann
(E-Mail Removed)
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 AE6KS 831-336-2558
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