On Wed, 06 Feb 2002, Smith, Graham - Computing Technician wrote:
> It seems fairly crap that a lot of these wireless solutions
> require 'line of sight' - Sure mobile phones dont require that
> to communicate to the base station. Walkie talkies can be bought
> for around EUR100 with approx 3 km range without line of sight..
> Ok the bandwidth is probably a lot smaller than 802.11's 11Mbps...
> and maybe i'm missing some massive technical reason here, but having
> to worry about trees and leaves on trees being in the way and that
> sorta thing is probably something people will laugh about in the future.
>
I think line-of-sight and what can interfere with a signal relates to the
region of the spectrum you're dealing with.
ie
IR is line of sight (almost any object will interfere)
Radio is not generally
XRays will only be interfered with by certina types of matter (eg bone)
The amount of bandwidth also relates I think to your region of the
spectrum. Hence mobile phones are at present good for only very slow data
transfers but 802.11b will give 12MBit/sec.
Gavin
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