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<DIV><FONT size=2 face=Arial>Two problem with using 30 dbm.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>With a 20 db dish that makes 50 dbm which is above
the legal limit of 36 dbm. If it is to be a legitimate record it has to be
legal.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>You actually have to back down your power with
bigger dishes to stay within the legal limit. </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>The other issue is that 1000mw sounds like
something more than just off the shelf wifi. </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Your 2.4m dish will probabl;y have a gain of say
25db and you might deduct 3db for losses. So your output power can't exceed 14
dbm.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Of course </FONT> <FONT size=2 face=Arial>as
an Amateur you can use higher power but I think the spirit of the record is that
it is off the shelf wifi without the benefit of using the higher power afforded
by being an Amateur. </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>In any event for this record it probably is
unnecessary anyway.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>cheers Peter </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=ratbaggy@hotmail.com href="mailto:ratbaggy@hotmail.com">Ratbaggy</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=melbwireless@wireless.org.au
href="mailto:melbwireless@wireless.org.au">MW Wireless</A> ; <A
title=vk3pb@optusnet.com.au href="mailto:vk3pb@optusnet.com.au">Peter
Berrett</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, December 31, 2011 7:29
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [MLB-WIRELESS] World Wifi
record</DIV>
<DIV><BR></DIV>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:
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<DIV><FONT size=2 face=Arial>I have just done the path loss calculations
assuming</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2 face=Arial>- 17 dbm transmission power (50
mw)</FONT></DIV>
<DIV><FONT size=2 face=Arial>- 20 db gain transmission antenna</FONT></DIV>
<DIV><FONT size=2 face=Arial>- 20 db gain receiving antenna</FONT></DIV>
<DIV><FONT size=2 face=Arial>- 3 db loss in cables</FONT></DIV>
<DIV><FONT size=2 face=Arial>- 2400 Mhz frequency</FONT></DIV>
<DIV><FONT size=2 face=Arial>- 127 km distance</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2 face=Arial>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 size=2 face=Arial>We probably would need to look into higher gain
antennas.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2 face=Arial>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 size=2 face=Arial>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 size=2 face=Arial>cheers Peter</FONT></DIV>
<DIV><FONT size=2 face=Arial> </FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=vk3pb@optusnet.com.au href="mailto:vk3pb@optusnet.com.au"
moz-do-not-send="true">Peter Berrett</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=wireless@smithsgully.net
href="mailto:wireless@smithsgully.net" moz-do-not-send="true">David
Nuttall</A> ; <A title=melbwireless@wireless.org.au
href="mailto:melbwireless@wireless.org.au" moz-do-not-send="true">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 size=2 face=Arial>Dear Dave</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2 face=Arial>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 size=2 face=Arial>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 size=2 face=Arial>The only issue is what dongle or router
should I use at my end? </FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2 face=Arial>cheers Peter</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=wireless@smithsgully.net href="mailto:wireless@smithsgully.net"
moz-do-not-send="true">David Nuttall</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=melbwireless@wireless.org.au
href="mailto:melbwireless@wireless.org.au" moz-do-not-send="true">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:
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type="cite">
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<DIV> </DIV>
<DIV><FONT size=2 face=Arial>Hi all</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2 face=Arial>Would anyone out there be interested in
attempting the world unamplified 2.4 ghz wifi record?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2 face=Arial>The record I think is held by some
Venezuelans (some Italians hold the 5.7 Ghz record).</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2 face=Arial>The strategy would be as
follows</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2 face=Arial>1. Use an established MW node such
as GHO North as one end of the link.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2 face=Arial>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 size=2 face=Arial>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 size=2 face=Arial>Successful transfer of video = world
record</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2 face=Arial>cheers </FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2 face=Arial>Peter VK3PB</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV><BR>
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