Re: looking for wireless packet system on _non_ 802.11 freqs

On Sun, 16 Jan 2011 05:55:18 +0000 (UTC), danny burstein
<dannyb@xxxxxxxxx> wrote:

Situation: using a computer in front of an audience, many
of whom are carrying/using 802.11 computers or phones.

The problem is that this saturates and overloads the wireless
network, making it just about impossible for the lecturer
to get decent access.

I've tried putting the presneter on a passord protected
"channel 1" circuit, and moved the public one to 11,
but there's still enough interference to be troublesome.

We can't (easily) use wires, nor powerlines.

So... I was thinking of getting a pair of transceivers,
one at the computer desk, the other at a router, which
are on a different frequency all together. If low
power (and on the right frequencies) they should be
ok without an FCC license.

So I was looking around and couldn't really find anything
that looked promising.

You're obviously using 2.4GHz 802.11b/g. It's a rather crowded band.
I did a site survey at a customers house the overlooks the city. My
sniffer showed about 70 wireless systems.

Look into getting a 5.7GHz 802.11a system. You have 12
non-overlapping channels to choose from and minimal appliance
interference (microwave ovens, TV security cameras, TIVO, etc). You
will hear some cordless phones, but they tend to stay at the bottom of
the band.

If you want to be totally evil, find some older frequency hopping
spread spectrum 802.11 gear (i.e. Breezecom, Raylink, old Symbol,
etc). When confronted with interefernce, these just slow down, unlike
802.11b/g which grinds to a halt. The catch is that you won't go very
fast. Maybe 3Mbits/sec at best.

Rather than a 2nd access point and client radio, it's much easier to
get a dual band 802.11a/b/g 2.4/5.7GHz access point or wireless
routers.

There is also some equipment on 900MHz but it's not very common.
<http://www.ubnt.com/sr9>
and also has interference problems.

If you wait long enough, the FCC will eventually release "white space"
rules, so that chip manufacturers can produce chipsets, and
manufacturers can produce products. These will work in the unused
areas between TV channels.

--
Jeff Liebermann jeffl@xxxxxxxxxx
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
.

Relevant Pages

  • Re: email NOT written by Jay Leno
    ... signals going through the air. ... Wireless is a big advance for phones, ... computers and other things. ...
    (rec.gambling.poker)
  • The Last American (Wireless) Virgin [Telecom]
    ... THE LAST AMERICAN (WIRELESS) VIRGIN ... the U.S. "adoption rate" for mobile ... Americans who have DVD players, home PCs, ... phones, but they're showing up in school backpacks at earlier ages. ...
    (comp.dcom.telecom)
  • Re: Two Netgear WGT624 models will not communicate
    ... |>option to use a wireless PC card. ... The intention is for DSL to go to ... If the wireless connectivity actually works between houses, ...
    (alt.internet.wireless)
  • Re: What brand of router to buy
    ... Wireless Cable/DSL Router have 4 ports for wire computers (that can be ... As long as the computers are On you can share all the printers with all ...
    (microsoft.public.windowsxp.network_web)
  • Re: iPhones false bargain
    ... The Boston Globe ... the $199 iPhone is a marvel ... telephones as well as their wireless networks. ... The cellphone companies say they sell phones below costs to attract ...
    (comp.dcom.telecom)