[MLB-WIRELESS] New world record for wifi link (125 Miles).

Steven Haigh netwiz at crc.id.au
Fri Aug 5 00:47:53 EST 2005

I've been looking at the path loss calculations for this, and we're  
going to need to improve by about 6-7db in RX...

 From the "radio link" software, it shows a -97db signal at the far  
end. Even the Senao cards are -91db for 1Mbit. For this to work, we  
will have to a) get more RX gain, and b) get even more RX gain.

If the link was dead on -91db RX, then we *might* be able to do it -  
however there is ZERO margin for conditions.

Granted, the calcs were for 22db gain antennas, and 2db coax loss. we  
could in theory gain 2db (less in reality) by strapping the equipment  
directly to the back of the dishes being used...

Thoughts on getting those critical extra dbs'? :)

Steven Haigh

Email: netwiz at crc.id.au
Phone: (03) 9308 3238 - 0412 935 897

On 05/08/2005, at 12:27 AM, David Smith wrote:

> I've been looking at paths around the state, and there are two  
> longer paths, both running from Mt Baw Baw.
> The first is a 223 km path east from Mt Baw Baw to Bald Mount / Mt  
> Kuark (where?).  Bald Mount is halfway between Orbost and Cann  
> River, about 15 km north of the highway.  I don't know anything  
> about Bald Mount - from the look of the map, it could be completely  
> inaccessible.
> The second is a 230 km path southwest from Mt Baw Baw across the  
> water to Mt Sabine in the Otways.  Mt Sabine is inland from Skenes  
> Creek near Tanybryn.  It looks a bit more hospitable than Bald  
> Mount and seems to have a fire lookout tower.  Surrounding trees  
> are another question.
> In the same area is Mt Cowley (227 km LOS to Mt Baw Baw) where  
> amateurs regularly set up for Field Days.  Again, I've never been  
> there so have no idea of the suitability for microwave ops.
> I'm pretty sure that both ends of the Camels Hump to Mt Buffalo  
> path are clear and (reasonably) readily accessible.  Don't know  
> about the other sites though.  Should we stick to that path and  
> keep the longer ones for the next attempt?  Or should we go for broke?
> With the pimples that we call mountains in this state, 230km looks  
> to be about the longest LOS path possible.
> Regards,
> Dave.
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