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<BODY lang=EN-AU link=blue bgColor=#ffffff vLink=purple>
<DIV><FONT size=2 face=Arial>What is the tolerated latency in the APRS- IS
?</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </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 title=vk4tec@tech-software.net
href="mailto:vk4tec@tech-software.net">Andrew Rich</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=ozaprs@aprs.net.au
href="mailto:ozaprs@aprs.net.au">Australian APRS Users</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, March 10, 2011 4:56
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [OZAPRS] FW: Was Something
is wrong,this is a fixed location....Now, we fixed it..</DIV>
<DIV><BR></DIV>
<DIV><FONT size=2 face=Arial>Why should a time stamp make a difference
?</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>You haven't moved</FONT></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 title=gordon.t@internode.on.net
href="mailto:gordon.t@internode.on.net">Gordon Taylor</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=ozaprs@aprs.net.au
href="mailto:ozaprs@aprs.net.au">'Australian APRS Users'</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, March 09, 2011 8:33
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [OZAPRS] FW: Was Something is
wrong, this is a fixed location....Now,we fixed it..</DIV>
<DIV><BR></DIV>
<DIV class=WordSection1>
<P class=MsoNormal>The issue of duplicate packets and speeds in excess of
500kmh have been fixed in my area.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Some troubleshooting by Dave VK4UN has shown that
whenever my Igate was running the duplicate packets and excessive speed
changes occur. With my Igate disconnected from the internet we
confirmed all was good as I drove from Brisbane to Buderim this
afternoon.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>We employed that well known and often used Windows
troubleshooting technique of rebooting the Igate. This has fixed the
problem. Below are two packets that demonstrate the issue I
had.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>It is clear that the packet through VK4OG-1 was
gated nearly 6 minutes before the packet through
VK4VP-1.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>I assume the time stamp is added when the packet is
received not when it is transmitted, which in the telemetry and SCADA world
I work in, is just not on. Our systems always time stamps event as
they occur so that any delays in the comms network do not compromise the
credibility of the data, as has happened here. I am not complaining
just highlighting that this is an issue.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><SPAN class=rawline><SPAN style="COLOR: black"
lang=EN><o:p> </o:p></SPAN></SPAN></P>
<P class=MsoNormal><SPAN class=rawline><SPAN style="COLOR: black"
lang=EN><o:p> </o:p></SPAN></SPAN></P>
<P class=MsoNormal><SPAN class=rawline><SPAN style="COLOR: black"
lang=EN>2011-03-09 03:49:40 UTC: <B><A
href="http://aprs.he.fi/?c=raw&limit=&call=VK4VP-7">VK4VP-7</A></B>>R7R4X6,<A
href="http://aprs.fi/?c=raw&limit=&call=VK4RBR-3">VK4RBR-3*</A>,WIDE2-2,qAS,<A
href="http://aprs.fi/?c=raw&limit=&call=VK4OG-1">VK4OG-1</A>:`Q]/ }WK\]"3t}=</SPAN></SPAN><SPAN
style="COLOR: black" lang=EN><BR> type:
location<BR> srccallsign:
VK4VP-7<BR> dstcallsign:
R7R4X6<BR> latitude: -27.41433333333333
°<BR> longitude: 153.0865 °<BR> course:
359 °<BR> speed: 90.74799999999999
km/h<BR> altitude: 2 m<BR> symboltable:
\<BR> symbolcode: K<BR> mbits:
101<BR> posresolution: 18.52
m<BR> posambiguity: 0<BR> comment:
]=</SPAN><o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><SPAN class=rawlineerr><SPAN lang=EN>2011-03-09 03:55:01
UTC: <B><A
href="http://aprs.he.fi/?c=raw&limit=&call=VK4VP-7">VK4VP-7</A></B>>R7R4X6,<A
href="http://aprs.fi/?c=raw&limit=&call=VK4RRC-13">VK4RRC-13*</A>,WIDE2-2,qAS,<A
href="http://aprs.fi/?c=raw&limit=&call=VK4VP-1">VK4VP-1</A>:`Q]/ }WK\]"3t}=
<B>[Duplicate position packet]</B></SPAN></SPAN><SPAN style="COLOR: black"
lang=EN><BR> type:
location<BR> srccallsign:
VK4VP-7<BR> dstcallsign:
R7R4X6<BR> latitude: -27.41433333333333
°<BR> longitude: 153.0865 °<BR> course:
359 °<BR> speed: 90.74799999999999
km/h<BR> altitude: 2 m<BR> symboltable:
\<BR> symbolcode: K<BR> mbits:
101<BR> posresolution: 18.52
m<BR> posambiguity: 0<BR> comment:
]=<o:p></o:p></SPAN></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Trebuchet MS','sans-serif'; COLOR: #310900; FONT-SIZE: 10pt"
lang=EN-US>Regards,<BR>Gordo VK4VP</SPAN></B><SPAN
lang=EN-US><o:p></o:p></SPAN></P>
<P class=MsoNormal><o:p> </o:p></P></DIV>
<P>
<HR>
<P></P>_______________________________________________<BR>OZAPRS mailing
list<BR>OZAPRS@aprs.net.au<BR>http://lists.aprs.net.au/mailman/listinfo/ozaprs<BR></BLOCKQUOTE>
<P>
<HR>
<P></P>_______________________________________________<BR>OZAPRS mailing
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