FW: [MLB-WIRELESS] bouncing off a survey marker on top of a hill? (fwd)

[Hal Johnson]

Vaskos,

C'mon man it's only Friday - serious drinking starts tomorrow
those things were called "Trig Stations" where I come from
Trig as in Trigonometry for field survey reference points
Radar Screens have enough junk or clutter received already from
God's ripples (hills) and buildings etc without signature scatter from
lumps of steel - still you may have something there
What do you think, Rowan?

Hal (first posting)


-----Original Message-----
From: owner-melbwireless at wireless.org.au
[mailto:owner-melbwireless at wireless.org.au]On Behalf Of vak
Sent: Friday, 29 October 2004 9:31 PM
To: Rowan Crowe
Cc: melbwireless at wireless.org.au
Subject: Re: [MLB-WIRELESS] bouncing off a survey marker on top of a
hill? (fwd)


Hi All,

It is highly unlikely that these could be used as anything but radar 
"markers", as they've been built to present a "known" RCS (Radar Cross 
Section). The RCS of an object is effectively its radar "signature" - 
eg, it returns a specific scattering. You will see these markers 
scattered across Melbourne and on top of certain buildings in the city.

This particular marker might be used for navigation - since it is close 
to the airport (or since there is a radar in the background, possibly 
for calibration).

Vaskos


>-------------------
>
>I'm wondering if it's feasible to passively bounce 802.11 off one of
>these:
>
>http://media.sensationcontent.com/rowan/gb-marker.jpg
>
>This was taken at Gellibrand Hill near the airport. I think it's some sort
>of survey marker; presumably that's the highest point of the hill. There's
>another hill near my new home that I can see along an easement (actually a
>dedicated water tank access road), although I haven't actually checked
>recently to see if the marker itself is visible from my block.
>
>Just a wild idea which popped into my head, I'll have a double storey
>place on the south side of my place so perhaps I could bounce off that
>thing to reach further south. :)
>
>Cheers.
>
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>.
>
>  
>


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