Bit of an odd question.
But does anyone know the theoretical maximum distance for a 802.11b link, without hosing the local power substation?
Obviously increasing power output, but how much is legal/safe etc
Thanks,
Joe
British Radio Authority licensing for the ISM (Instrumentation, Scientific and Medical) band 2.4GHz prohibit transmissions more powerful than 90 milliwatts.
Essentially a traditional wireless card equipped with an 18dBi antenna takes you as close to the legal limit.
Distances with an 18dBi Plannar directional can be up to and including 5Km, direct line of sight.
Cameron Gray
[Any views expressed on this forum are my own, and may not represent the views of any employer or organisation that I am connected with.]
Ok, thanks, you wouldn't happen to know where I could obtain such an antenna do you?
Thanks,
Joe
It depends on the type of anntena port you have on the card, you can get a load from eBay, if you have a common port type you can get them pretty cheap. For outdoor use, try and get an antenna with a N type lead, and buy a N type pigtail for your wireless card.
P.S. Cameron, don't the Cisco 350 wireless cards work at 100 milliwatts by default?
Ben Ashton
igx0.net
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You can have any power card you like as long as the combined power doesn't exceed 90 milliwatt. i.e. they'll have a -2dBi spreader antenna, not a gain boosting one.
Cameron Gray
[Any views expressed on this forum are my own, and may not represent the views of any employer or organisation that I am connected with.]
Is it possible to source american equipment from say ebay which is more powerfull than the standard UK? I knew this was possible with those mini walkie talkies.
I imagine it's possible (I think certain AP's can be boosted by themselves to run at higher than the legally prescribed limits, for example the Linksys WAP54G / WRG54G can be made to do so with 3rd party firmware such as sveasoft).
However afaik it's not just a case of 'it's not legal to sell equipment transmitting at above 18db', it's actually not legal to use it. Unless anyone knows otherwise?
Anyone using equipment above the regulated limit for the 2.4Ghz ISM band is guilty of violating section 6 (I think) of the Radio Telegraphy Act, which has been rolled into the Communications Act (2000).
Typical penalty is £5000 fine, and 12 month suspended sentence.
Same applies for using equipment not in either the 2.4GHz or 5.4 GHz ISM bands without a license to do so.
Cameron Gray
[Any views expressed on this forum are my own, and may not represent the views of any employer or organisation that I am connected with.]
Originally Posted by Cameron Gray
So all these people buying walkie talkies on ebay could face a £5k fine. Ouch. How exactly is it policed though? They cant exactly go around every house in the country checking that their wifi is inside the certain guidelines
Edit : Please delete, is it possible to delete our own posts because I seem to be in the habit of posting more than once with the same thing.
Last edited by Jonsen; 16th December 2005 at 07:10 AM.
If anyone complains of interference, they will investigate and feel your collar or if you are near an RA "listening station" and they pick it up same result.
Most arrests/fines are due to complains of overlap or interference. They will definately do something if you "leak" onto the licensed band either side of the ISM bands.
Cameron Gray
[Any views expressed on this forum are my own, and may not represent the views of any employer or organisation that I am connected with.]
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