distances achievable with this settup

I wish to set up a point-multipoint network in my village (if I can get
others interested) using individual connections, rather than a mesh based
network.


Current UK info from the RA (now ofcom) states

+ 2.4 GHz
+ Licence exempt Commercial public services allowed since July 2002.
Limited power at 100mW eirp restricting range.
+ Broadband devices giving about 11 Mbps but this will be divided by the
no. of users of a system
+ Free access but proliferation of devices may cause congestion.
Providing it meets UK technical requirements 802.11b equipment may be
used, as will 802.11g, which is under development for higher data rate
equipment.

found in
http://www.ofcom.org.uk/static/archi...band/table.doc

using some info from cisco (100 mW EIRP maximum) :

Antenna Gain (dBi) Maximum Power Level (mW)

0 100
2.2 50
5.2 30
6 30
8.5 5
12 5
13.5 5
21 1


Could anyone give me rough ideas on distances achievable with different
antennas.
I am guessing about 1mile~=1.6Km radius from base which is not really good
enough

any other ideas

many thanks

Andrew

It's possible to achieve 1 mile (and lot more) with directional antenna and
clear line of sight.
Your problem will be that you need omnidirectional antenna and the signal
will be totally unpredictable in a built up area. It will work at a fair
distances (~400 meters) trough windows, but where you need to go trough a
wall it will
again be unpredictable (depends on what the walls are made of and how
thick).
You may be better off with 802.11a system, do some research.
Regards,
Martin

Thanks for your reply.. I should of stated its a fixed point wireless
network , but I guess you knew that

I believe I will soon be able to use 5 GHz Band B used by 802.11a

ofcom info:
+ 5 GHz Band B
+ 5.47 - 5.725 GHz
+ Licence exempt
+ Limited power at 1W eirp restricting range. Outdoor use permitted.
Can provide up to 20 Mbps but depends on no. of users.

+ remarks same as Band A
Technical requirements set out in Interface Regulation (IR) 2006 -
currently an interim version pending inclusion of requirement for dynamic
frequency selection (DFS) and Transmit Power Control (TPC) implementation.
802.11a devices will comply with current (interim) IR. 802.11h devices will
include DFS and TPC.

I got to check that the dates still hold and so I know when it will be
passed. Obviously my understanding of radio needs a refresh!
I thought 802.11a could provide 54 Mbps, so why is 20Mbps stated by ofcom?

will have to go around with a antennas, a omnidirectional antenna on a pole,
laptops, car batteries and collect some data.

i also need some data on different antennas and mixing different types of
antennas in a solution

regards

Andrew