On Sat, 13 May 2000, Grahame M. Kelly wrote:
> On Sat, 13 May 2000, Anthony Rumble wrote:
> > On Sat, 13 May 2000, Jon Biddell wrote:
> >
> > > >Maby you guys are thinking above what im planning..
> > > >Im looking at low power spread spectrum stuff.. like the Wavelan..
> > > >only 2mb/s stuff.
> > > >
> > > >Would be using a small yagi, no dish here.
> > > >And a 6m mast would be out of the question.
> > >
> > > Hmmm... Packet Radio ???...:-)
> > >
> > > A small Yagi, suitably alligned at each end, connected to the WaveLan
> > > card(s) will probably work at low speeds - what output power do they have
> > > (might need to boost it slightly)....
> >
> > I've been told you can get up to 2MB/s over 8kms with this setup.
> >
>
> Yep this is so, the Electricity Commission of NSW uses the same
> techniques. An array (30 elements or so) will give you about 20db
> gain (3db = x2 effect) by narrowing the beam to a couple of degrees
> for good point-to-point transmissions (you'll need to make the
> antenna especially for the carrier freq and for the bandwidth you
> require). If you use the standard constructions techniques then it
> will look sortof like a UHF TV arial so local councils and other
> nosey people probably will not even notice it (assuming you don't have
> to put it up a 30m tower). Make sure you use N-Connectors and really
> ultra low loss cable (expect 3db loss i.e. 50% lose for every 10m
> runs with standard retail available cable, see cable specialists
> to get the commercial stuff). If you want you can built two and link
> them as phase arrays (paralleling).
>
> Any ham op with Satellite experience can assist you with this.
Cool.. well I just worked it out, the distance is 1.2km as the crow
flies... which should make it even easier..
---
Anthony Rumble
LinuxHelp http://www.LinuxHelp.com.au Phone: 0500 500 368
Direct 02-9712-1799 Mobile 0412-955-042 Fax 02-9712-3977
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