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Hi Peter,<br>
<br>
Yes, you are right about -88 being a bit low, that leaves very
little margin.<br>
<br>
I'd propose this setup...<br>
<br>
* +30 dBm transmit power (Routerboard RB711UA-2HnD) Did Mike say he
was interested in sponsoring?<br>
(it's a dual chain radio, probably get +27 from a single port?)<br>
<br>
* 24 dB gain grid antennas (Hills etc) I have several<br>
or 2.4m dish - about 34 dB gain?<br>
<br>
* 1 dB loss in cables/connectors at each end, radios mounted
directly to the antennas.<br>
<br>
* Use CH1, where transmit spectrum is all below 2450 MHz. EIRP not
a problem.<br>
13 Centimetre <span lang="EN-AU">Amateur Band is 2300.000 MHz -
2450.000 MHz</span> (I also have an advanced license.)<br>
<br>
* 155 Km (Donnabuang, but will need to check the clearance over
trees from the observation tower)<br>
<br>
Which will give about -70 dBm with the grids and if we use the big
antenna at one end, maybe -60 dBm.<br>
<br>
Here's what Radio Mobile thinks of the hop, a couple of dB lower
than my calcs.<br>
<br>
<a href="http://www.ratbaggy.net/wireless/long_hop.png">Radio Mobile
Plot</a><br>
<br>
I'm back at work on Tuesday which really only leaves the weekends
open for me.<br>
<br>
Regards<br>
<br>
Dave<br>
<br>
On 31/12/2011 12:50 PM, Peter Berrett wrote:
<blockquote cite="mid:0029072536C343119427AA1BD0B4ABA1@PetePC"
type="cite">
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<div><font face="Arial" size="2">I have just done the path loss
calculations assuming</font></div>
<div> </div>
<div><font face="Arial" size="2">- 17 dbm transmission power (50
mw)</font></div>
<div><font face="Arial" size="2">- 20 db gain transmission antenna</font></div>
<div><font face="Arial" size="2">- 20 db gain receiving antenna</font></div>
<div><font face="Arial" size="2">- 3 db loss in cables</font></div>
<div><font face="Arial" size="2">- 2400 Mhz frequency</font></div>
<div><font face="Arial" size="2">- 127 km distance</font></div>
<div> </div>
<div><font face="Arial" size="2">I calculate a received
signal after antenna gain of about -88 dbm which is a bit low
for my liking.</font></div>
<div> </div>
<div><font face="Arial" size="2">We probably would need to look
into higher gain antennas.</font></div>
<div> </div>
<div><font face="Arial" size="2">Mind you I have assumed that each
of our antennas has 20db gain. I don't know what the gain
figure would be for a 90cm offset dish at 2400 mhz? Higher
maybe? </font></div>
<div> </div>
<div><font face="Arial" size="2">It is possible that your 2.4m
dish has a higher gain figure than 20db which would help give
some margin.</font></div>
<div> </div>
<div><font face="Arial" size="2">cheers Peter</font></div>
<div><font face="Arial" size="2"> </font></div>
<div> </div>
<div> </div>
<div> </div>
<blockquote style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT:
5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"
dir="ltr">
<div style="FONT: 10pt arial">----- Original Message ----- </div>
<div style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color:
black"><b>From:</b> <a moz-do-not-send="true"
title="vk3pb@optusnet.com.au"
href="mailto:vk3pb@optusnet.com.au">Peter Berrett</a> </div>
<div style="FONT: 10pt arial"><b>To:</b> <a
moz-do-not-send="true" title="wireless@smithsgully.net"
href="mailto:wireless@smithsgully.net">David Nuttall</a> ; <a
moz-do-not-send="true" title="melbwireless@wireless.org.au"
href="mailto:melbwireless@wireless.org.au">MW Wireless</a> </div>
<div style="FONT: 10pt arial"><b>Sent:</b> Saturday, December
31, 2011 12:35 PM</div>
<div style="FONT: 10pt arial"><b>Subject:</b> Re: [MLB-WIRELESS]
World Wifi record</div>
<div><br>
</div>
<div><font face="Arial" size="2">Dear Dave</font></div>
<div> </div>
<div><font face="Arial" size="2">I have a 90cm offset dish that
I could tack my cantenna onto and I live right by Mt
Dandenong.</font></div>
<div> </div>
<div><font face="Arial" size="2">I am off work until 10th
January. Want to try for the record? You would head out to
Ballarat and I'd park myself up at Skyhigh.</font></div>
<div> </div>
<div><font face="Arial" size="2">The only issue is what dongle
or router should I use at my end? </font></div>
<div> </div>
<div><font face="Arial" size="2">cheers Peter</font></div>
<div> </div>
<div> </div>
<div> </div>
<div> </div>
<div> </div>
<blockquote style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT:
5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<div style="FONT: 10pt arial">----- Original Message ----- </div>
<div style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color:
black"><b>From:</b> <a moz-do-not-send="true"
title="wireless@smithsgully.net"
href="mailto:wireless@smithsgully.net">David Nuttall</a> </div>
<div style="FONT: 10pt arial"><b>To:</b> <a
moz-do-not-send="true"
title="melbwireless@wireless.org.au"
href="mailto:melbwireless@wireless.org.au">MW Wireless</a>
</div>
<div style="FONT: 10pt arial"><b>Sent:</b> Wednesday, December
28, 2011 1:18 PM</div>
<div style="FONT: 10pt arial"><b>Subject:</b> Re:
[MLB-WIRELESS] World Wifi record</div>
<div><br>
</div>
Hi Peter,<br>
<br>
How about we start out with the Australian WiFi record? I
believe the W.A. guys established a fairly long link out to
Rottnest Island some time back. However, I know of no longer
link than Peter Buncle's hop from Kallista to the original
Highton location at around 100 Km's.<br>
<br>
A Picnic/BBQ trip to Mt Buninyong would give us a path of 127
Km back to node GHO at Mt Dandenong.<br>
<br>
I donated a 2.4 m domestic sat dish and Rob B built up a 2.4
GHz feed and tripod for the dish. They are still sitting in
my shed ready for such a project.<br>
<br>
Regards<br>
<br>
Dave<br>
<br>
<br>
<br>
On 27/12/2011 10:30 PM, Peter Berrett wrote:
<blockquote cite="mid:3E6372B3F7724ACA9D7622F351038DD2@PetePC"
type="cite">
<meta name="GENERATOR" content="MSHTML 8.00.6001.19088">
<style></style>
<div> </div>
<div><font face="Arial" size="2">Hi all</font></div>
<div> </div>
<div><font face="Arial" size="2">Would anyone out there be
interested in attempting the world unamplified 2.4 ghz
wifi record?</font></div>
<div> </div>
<div><font face="Arial" size="2">The record I think is held
by some Venezuelans (some Italians hold the 5.7 Ghz
record).</font></div>
<div> </div>
<div><font face="Arial" size="2">The strategy would be as
follows</font></div>
<div> </div>
<div><font face="Arial" size="2">1. Use an established MW
node such as GHO North as one end of the link.</font></div>
<div> </div>
<div><font face="Arial" size="2">2. Go about 400 km+ in the
direction the node antenna is pointing and erect a node
and directional antenna, perhaps solar powered, with a
small computer and high gain antenna pointing at the MW
node. Perhaps our friends at the Adelaide wireless group
could set up a node in their group pointing at us? </font></div>
<div> </div>
<div><font face="Arial" size="2">3. Monitor 2.4 ghz beacons
and when there is some tropospheric ducting try the
link. Or better still just automate things so that when
the station is heard it automatically tries to transfer
a video from one end of the link to the other.</font></div>
<div> </div>
<div><font face="Arial" size="2">Successful transfer of
video = world record</font></div>
<div> </div>
<div><font face="Arial" size="2">cheers </font></div>
<div> </div>
<div><font face="Arial" size="2">Peter VK3PB</font></div>
<div> </div>
<div> </div>
<div> </div>
<div> </div>
<div> </div>
<div> </div>
<br>
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