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Re: How geographically big can a Wireless LAN be?


  • To: ukha_d@xxxxxxx
  • Subject: Re: How geographically big can a Wireless LAN be?
  • From: "Nick Towers" <nickt@xxxxxxx>
  • Date: Mon, 16 Sep 2002 11:25:43 -0000
  • Mailing-list: list ukha_d@xxxxxxx; contact ukha_d-owner@xxxxxxx
  • Reply-to: ukha_d@xxxxxxx

OK, looking at this further, using 2 highish gain antennae, is it
possible to direct their "beams" to meet at the apex of a triangle
somewhere above ground, thus avoiding buildings, hills etc which
might be in the way?
Also, if you're going to use a high gain antenna, do you need a
special card or AP, or any additional hardware to amplify signals etc?

Nick

--- In ukha_d@y..., Andy Laurence <andy@a...> wrote:
> On Mon, 16 Sep 2002, Gerard McGovern wrote:
> > > In a recent post on UKHA_Buy, the following statement was made
about
> > > 802.11b Wi-Fi compliant PCMCIA cards.
> > > "With 24 dbi antennas at both ends, I have gone 8 miles with no
> > > problems"
> >
> > Someone please feel free to correct me, but isn't something that
is a
> > good transmitter also a good receiver? This is the principal of
mobile
> > phones and base stations. Base station very hi powered, mobile
phone
> > not.
>
> Correct.
>
> > So in theory, you just need one decent antenna because if it can
> > broadcast that far, it should also receive that far? But then
again, you
> > could use two antennas to meet in the middle and I have just
> > contradicted what I first said.
>
> Sounds like you've answered your own question ;-)
>
> To go a certain distance, you need a certain amount of gain.  This
must be
> distributed between the communicating radios.  For the sort of
distances
> mentioned, you will need an amount of gain at each end.  Last week,
we
> were going 70 yards through buildings using a 6dB panel antenna
(1dB for
> the connector puts us on the legal limit) at one end, and a
standard card
> with no external antenna at the other end.  We were quite chuffed :-
)
>
> Andy
> --
> Building a wireless community network for Bristol
> http://consume.andylaurence.co.uk - updated 14/09
> 4x4 in town - bog brush for your teeth
> NB: Alternate E-Mail - andylaurence at yahoo dot co dot uk



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