"dave" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed) m...
> Hello guys
>
> I am getting a broadband conx soon and I work about 3.5 miles from my
> flat
> Is it possible to Share my conx though a wi-fi net? i know that these
> nets
> work best with line of sight, however if i got a very powerful
> signal/antenna would it get though?
>
> what gear do you recomend cost???
>
> I have other knowledge of computers so ask a question in return.
>
> if anyone helps me and also live in Chelmsford I am willing to share
> the
> conx
Hi.
Without knowing shedloads more it is really hard to be specific about an
answer. If there is only one or two buildings in the way (NOT made of metal
etc) then there is a fair chance it would work if that is all that is
between you and the other location if you use good aerials at both ends
(yagi / parabola) and assuming that you are both at about the same height.
Unfortunately at this type of range you are really looking for fairly
optimum conditions already if the link is to be at all usable.
If however the elevations are different so the signal would have to go
through half a hill to get there then definately not. Also if there is a
large number of buildings between you and then, then again the answer is
almost certainly going to be No - unless you got indescribably lucky and
managed to bounce the signal off a large superstructure visible to both
sides. For example if both your flat and the office can see a massive steel
side building then there is a chance you could bounce off it. In reality, I
wouldn't bet too much, not at the sort of distances you are trying to do.
As for a more powereful signal, you can use 100mW in the UK and that,
combined with good aerials at both ends can do some fab LOS distances - 20 -
30 miles. However with enough buildings and concrete in the way you can
divide that range by 100 and still be pushing your luck. Power is a small
part of the big picture. Aerial gain and height is vital - and a sensitive
receiver both ends can make quite a difference too.
With an aerial, an improvement at either end tends to make both sides work
better as it both improves transmission AND reception (diversity excepted).
Increasing power at just one end is almost useless. Think of two people on
opposite sides of a valley, one with a megaphone and the other with a soft
voice.
Other possibilites exist - other than the facetious "Move nearer to the
office"
Use 900 Mhz, more tolerarant for non LOS but much dearer (approved in UK??)
and lower bandwidth. Still not great for going through buildings but an
order of magnitude better then 2.4 Ghz (Don't even think about 5Ghz BTW,
you'd be lucky to make it to the next block)
Use a bridge - if there is a friend who lives in sight of both locations
(tower block ? ) then put a bridge there and you can "bounce" off him - and
give him broadband access as "payment" for the use of his rooftop garden.
Other with lots more knowledge may also give you some more ideas but with
high UHF (almost SHF) frequencies, line of sight pretty much means what you
think it does unless you are happy to have your range decimated.
Mark
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