[LINK] Senator Coonan on 7:30 Report

[Roger Clarke]

At 7:43 +1000 19/6/07, Richard Chirgwin wrote:
>I have one small experience. When at the ATUG regional conference in 
>Canberra last month, the exhibition room was connected by YLess4U to 
>a base station 19km away. I think it was using a 5.8GHz connection.
>The service worked just fine. As you say, George, it doesn't go 
>through hills, so the transceiver was mounted on a 5m pole. That 
>isn't, however, that much of a hardship.

That surprises me, because Canberra's hills mean that a 19km line of 
sight is challenging (assuming a single transmitter rather than 
repeaters or multiple cells with some kind of cotention-avoidance).

(It also surprises me that you didn't arrange a beer with us locals 
Richard!  Mind you, I wasn't in town during May ...).

The only image I could quickly find is here:
http://www.abc.net.au/science/news/stories/s310182.htm

I couldn't quite make these do what I wanted:
http://www.gim.act.gov.au/actLocate/index.dwt
http://www.actmapi.act.gov.au/framesetup.asp

Where was the conference held?  And do you have any idea where the 
transmitter was?  (Although maybe we can guess that from the location 
of a conference and a map ...).

Ah, the National Museum:  http://www.atug.com.au/all_cal_events.cfm

The southern end of Tuggeranong??  (But Calwell and Mt Tennant don't 
have inter-visibility north of the Mt Taylor ridge-line).

Or the northern rim of Belconnen?  That wouldn't even serve most of 
Woden or Weston Creek.

So maybe 19km from the Museum means the Brindabellas - which could be 
a smart choice, because it would get around many of the big hills. 
Bad luck for the 20% of Canberra that would still be in the shadows 
though.


-- 
Roger Clarke                  http://www.anu.edu.au/people/Roger.Clarke/

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Visiting Professor in Info Science & Eng  Australian National University
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