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Hi Peter,<br>
<br>
Here's what Radio Mobile thinks of the path from Mt. Dandenong to
Mt. Buninyong. The signal predicted is somewhat lower than what
would be expected using raw path loss, antenna gains, feeder loss,
power etc. I used a clear spot with no trees and a sharp falloff on
the East side of Mt. Buninyong for one end of the link. I used GHO
as the other end only because it's in my database, obviously we'll
find another spot.<br>
<br>
<a href="http://www.ratbaggy.net/wireless/GHO-Buninyong.PNG">http://www.ratbaggy.net/wireless/GHO-Buninyong.PNG</a><br>
<br>
Radio Mobile uses the Longley-Rice model to predict radio
propagation producing a median value. It even takes into account
how "carefully" the link was sited and climate. The figures
predicted by this model should be quite attainable in real world
situations.<br>
<br>
<a href="http://flattop.its.bldrdoc.gov/itm.html">http://flattop.its.bldrdoc.gov/itm.html</a><br>
<br>
Regards<br>
<br>
Dave<br>
<br>
<br>
On 2/01/2012 12:52 PM, Peter Berrett wrote:
<blockquote cite="mid:149A2C05D18847B9B408EE19C8CA4709@PetePC"
type="cite">
<title>Re: [MLB-WIRELESS] World Wifi record</title>
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<div><font face="Arial" size="2">Ok Let's do a sample calculation
now based on the actual equipment I own</font></div>
<div> </div>
<div><font face="Arial" size="2">I'll use the calculator at </font></div>
<div> </div>
<div><font face="Arial" size="2"><a moz-do-not-send="true"
href="http://www.afar.net/rf-link-budget-calculator/">http://www.afar.net/rf-link-budget-calculator/</a></font></div>
<div> </div>
<div><font face="Arial" size="2">We'll assume that the setup at
Binunyong has the maximum power output made up of 30db gain
dish plus 8db power output and -2db cable loss = 36 dbm
maximum legal power</font></div>
<div> </div>
<div><font face="Arial" size="2">At my end on Mt Dandenong a 24
dbm ex galaxy dish plus 14 dbm power and allow 2dbm cable loss
with a Ubiquity bullet with -95 db receiver sensitivity @
1Mb/s </font></div>
<div> </div>
<div><font face="Arial" size="2">That should give a receive signal
strength of -84.3 dbm with a fade margin of 10.7db</font></div>
<div> </div>
<div><font face="Arial" size="2">Not a huge margin to play with
but arguable doable. The Ubiquity will probably do 256kbs at
-100 or -105dbm so that should give a bit more elbow room.</font></div>
<div> </div>
<div><font face="Arial" size="2">cheers Peter </font></div>
<div> </div>
org.au/mailman/listinfo/melbwireless
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