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<DIV><FONT face=Arial size=2>So get the speed up and the payload
down.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>We just accept and live with 1200 baud on
VHF</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Pulse mod on 1200 MHz </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>We need to start playing with next gen position
reporting</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=tkomljan@yahoo.co.uk href="mailto:tkomljan@yahoo.co.uk">Tony
Komljanec</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=aprssig@lists.tapr.org
href="mailto:aprssig@lists.tapr.org">aprssig@lists.tapr.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, April 07, 2008 5:02
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [SPAM] [aprssig] Re: Protocols
(OTA)</DIV>
<DIV><BR></DIV>
<BLOCKQUOTE class=replbq
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">
<DIV>Sure there are more efficient protocols that could be put into service
for APRS. But from my experience in the Toronto to Niagara Falls area
tying to use an OT2 with a 5W mobile (car mounted antenna) package, the
issue is not with the number of bytes, but with packet collisions and
Aloha! </DIV>
<DIV> </DIV>
<DIV>I can get semi-reliable mobile operation only within about 3 kms from
an urban digi. Any more distance than that and the number of
successful packets getting into the database goes down
exponentially. </DIV>
<DIV> </DIV>
<DIV>The same scenario into an isolated (rural) digi yields reliable
coverage to the limit of the 5W range. </DIV>
<DIV> </DIV>
<DIV>I'd sure like to see over-the-air traffic control to
reduce/eliminate packet collisions! How about AIS (although it is
patented and GMSK)? <A
href="http://oh7lzb.blogspot.com/2007/08/ais-ship-tracking.html">http://oh7lzb.blogspot.com/2007/08/ais-ship-tracking.html</A>
Or any other existing and successful standard tweaked for amateur
use?</DIV>
<DIV> </DIV>
<DIV>Is there a generally accepted complimentary VHF APRS
frequency that can be used in a DUPLEX configuration? </DIV>
<DIV> </DIV>
<DIV>I've enjoyed APRS and appreciate all the work, software,
hardware and servers that many people have put into
it. Just need to make it more reliable in the cities.
</DIV>
<DIV> </DIV>
<DIV>>I have been doing some work with RADAR >protocols, that by
nature have to be small in payload >and contain as much info as
possible.<BR></DIV></BLOCKQUOTE>
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