802.11g

[Alasdair]

Can someone tell me the precise frequency for the 802.11g system? I
want to get hold of a Yagi antenna to enable me to receive signals
from a router in another building about 850 metres away. I am having
a problem sourcing such an item.

--
Alasdair.

[o p @secret.com Gonz]

"Alasdair" <ma...@bobaxter.coo.uk> wrote in message
news:b1lfe35mm8c028ic6...@4ax.com...

2.4 - 2.5 GHZ
I thought it operated in steps/channels, so can be on any frequency
within that range?

[Digby]

On Wed, 12 Sep 2007 13:01:57 +0100, Alasdair <ma...@bobaxter.coo.uk>
wrote:

http://www.wifigear.co.uk/viewProduct.aspx?Product=E4C96A3A-9559-4601-814E-C70E5575806E&Category=E5D235E6-E69D-4974-9EA9-22BD3BBC0CB5

http://cgi.ebay.co.uk/18dBi-Yagi-Antenna-WiFi-2-4GHz-802-11g-High-Power_W0QQitemZ270121262146QQihZ017QQcategoryZ16145QQcmdZViewItem

http://www.radioworld.co.uk/~radio/catalog/mfj1800-wifi-15dbi-yagi-antenna-80211b80211g-p-4727.html

http://www.wsplc.com/acatalog/SHF_MFJ_Portable_Yagi__2400-2485MHz_.html

http://www.solwise.co.uk/wireless-outdoorantenna-24-yagi-14yn.htm

[dennis@home]

"Gonz" <T o p @ S e c r e t . c o m> wrote in message
news:8GQFi.23148$no6....@fe091.usenetserver.com...

Google for cantenna for lots of information including how to make your own
aerial.

[SJP]

"Alasdair" <ma...@bobaxter.coo.uk> wrote in message
news:b1lfe35mm8c028ic6...@4ax.com...

http://en.wikipedia.org/wiki/802.11g#802.11g

[Graham.]

"Alasdair" <ma...@bobaxter.coo.uk> wrote in message
news:b1lfe35mm8c028ic6...@4ax.com...

Wifi is uses a spread-spectrum technique and is not a narrow-band
signal with a single precise carrier. The so-called channels overlap
big-time with "g"

Midband is about 2.45 Ghz and I imagine that will be the figure you want.
There are plenty of ready-made 2.4Ghz aerials out there specifically for
wi-fi, why don't you let the manufacturers worry about the specs?

--
Graham.
%Profound_observation%

[Gizmo.]

"Alasdair" <ma...@bobaxter.coo.uk> wrote in message
news:b1lfe35mm8c028ic6...@4ax.com...

Necessitates eating a can of Pringles :o)

http://www.oreillynet.com/cs/weblog/view/wlg/448

[Graham.]

"Gizmo." <spam...@suck.die> wrote in message
news:GXYFi.40471$Nc.3...@newsfet01.ams...

When we are shopping, while SWIMBO is buying groceries, I have been
taking an unhealthy interest in toilet-brush holders.

--
Graham.
%Profound_observation%

[o p @secret.com Gonz]

"dennis@home" <den...@killspam.kicks-ass.net> wrote in message
news:fc8lpl$i28$1...@news.datemas.de...

Thanks Dennis, but I'll leave the nerdy stuff for the nerds :o)

[R. Mark Clayton]

"Alasdair" <ma...@bobaxter.coo.uk> wrote in message
news:b1lfe35mm8c028ic6...@4ax.com...

It is in a band around 2G4Hz to 2G5Hz. A single aerial will do very well.
They are probably available commercially.

If the router is shared then you only want a Yagi at one end, however for
850m with the powers available you probably want a Yagi at both ends for a
reasonable data rate.

General tips at this frequency.

1. Keep RF leads short, neat, thick and continuous. e.g. CT167 on
F-connectors.

2. Use horizontal polarisation - most wireless routers will have vertical
aerials, so this will hugely reduce interference.

[fred]

In article <N_mdnXbzFaGxw3Tb...@bt.com>, R. Mark
Clayton <nospam...@btinternet.com> writes

>
>General tips at this frequency.
>
>1. Keep RF leads short, neat, thick and continuous. e.g. CT167 on
>F-connectors.
>

That doesn't sound right, CT167 is 75ohm, shouldn't it be 50?

>2. Use horizontal polarisation - most wireless routers will have vertical
>aerials, so this will hugely reduce interference.
>

Nice tip, thanks.
--
fred
Plusnet - I hope you like vanilla