<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:p="urn:schemas-microsoft-com:office:powerpoint" xmlns:a="urn:schemas-microsoft-com:office:access" xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:s="uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" xmlns:rs="urn:schemas-microsoft-com:rowset" xmlns:z="#RowsetSchema" xmlns:b="urn:schemas-microsoft-com:office:publisher" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:c="urn:schemas-microsoft-com:office:component:spreadsheet" xmlns:odc="urn:schemas-microsoft-com:office:odc" xmlns:oa="urn:schemas-microsoft-com:office:activation" xmlns:html="http://www.w3.org/TR/REC-html40" xmlns:q="http://schemas.xmlsoap.org/soap/envelope/" xmlns:rtc="http://microsoft.com/officenet/conferencing" xmlns:D="DAV:" xmlns:Repl="http://schemas.microsoft.com/repl/" xmlns:mt="http://schemas.microsoft.com/sharepoint/soap/meetings/" xmlns:x2="http://schemas.microsoft.com/office/excel/2003/xml" xmlns:ppda="http://www.passport.com/NameSpace.xsd" xmlns:ois="http://schemas.microsoft.com/sharepoint/soap/ois/" xmlns:dir="http://schemas.microsoft.com/sharepoint/soap/directory/" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:dsp="http://schemas.microsoft.com/sharepoint/dsp" xmlns:udc="http://schemas.microsoft.com/data/udc" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sub="http://schemas.microsoft.com/sharepoint/soap/2002/1/alerts/" xmlns:ec="http://www.w3.org/2001/04/xmlenc#" xmlns:sp="http://schemas.microsoft.com/sharepoint/" xmlns:sps="http://schemas.microsoft.com/sharepoint/soap/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:udcs="http://schemas.microsoft.com/data/udc/soap" xmlns:udcxf="http://schemas.microsoft.com/data/udc/xmlfile" xmlns:udcp2p="http://schemas.microsoft.com/data/udc/parttopart" xmlns:wf="http://schemas.microsoft.com/sharepoint/soap/workflow/" xmlns:dsss="http://schemas.microsoft.com/office/2006/digsig-setup" xmlns:dssi="http://schemas.microsoft.com/office/2006/digsig" xmlns:mdssi="http://schemas.openxmlformats.org/package/2006/digital-signature" xmlns:mver="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns:mrels="http://schemas.openxmlformats.org/package/2006/relationships" xmlns:spwp="http://microsoft.com/sharepoint/webpartpages" xmlns:ex12t="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:ex12m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:pptsl="http://schemas.microsoft.com/sharepoint/soap/SlideLibrary/" xmlns:spsl="http://microsoft.com/webservices/SharePointPortalServer/PublishedLinksService" xmlns:Z="urn:schemas-microsoft-com:" xmlns:st="" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=iso-8859-1"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
@font-face
{font-family:"Trebuchet MS";
panose-1:2 11 6 3 2 2 2 2 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p
{mso-style-priority:99;
mso-margin-top-alt:auto;
margin-right:0cm;
mso-margin-bottom-alt:auto;
margin-left:0cm;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
p.MsoAcetate, li.MsoAcetate, div.MsoAcetate
{mso-style-priority:99;
mso-style-link:"Balloon Text Char";
margin:0cm;
margin-bottom:.0001pt;
font-size:8.0pt;
font-family:"Tahoma","sans-serif";}
span.BalloonTextChar
{mso-style-name:"Balloon Text Char";
mso-style-priority:99;
mso-style-link:"Balloon Text";
font-family:"Tahoma","sans-serif";}
span.EmailStyle19
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.rawlineerr
{mso-style-name:raw_line_err;
color:red;}
span.rawline
{mso-style-name:raw_line;}
span.EmailStyle22
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#7030A0;
font-weight:normal;
font-style:normal;}
span.EmailStyle24
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#7030A0;
font-weight:normal;
font-style:normal;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-AU link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#7030A0'>More thought on this.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#7030A0'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#7030A0'>If this were coming from a fixed stn, it would have identical data and only a different time stamp, yet it does not get noted as duplicate data.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#7030A0'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#7030A0'>But in the data below, identical data with a different time stamp is seen as duplicate data.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#7030A0'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#7030A0'>If the time stamp were embedded in the packet, both packets would be identical (apart from the path if they went through different digi’s) and it would clearly be the same packet. That is the reason for time stamping at the origin.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#7030A0'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#7030A0'>I think we need to know what the algorithm the servers use to distinguish identical data.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#7030A0'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#7030A0'>Something is odd, might even be me.....<o:p></o:p></span></p><p class=MsoNormal><span style='color:#7030A0'><o:p> </o:p></span></p><div><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Trebuchet MS","sans-serif";color:#310900'>Regards,<br>Gordo VK4VP</span></b><span lang=EN-US style='color:#7030A0'><o:p></o:p></span></p></div><p class=MsoNormal><span style='color:#7030A0'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> ozaprs-bounces@aprs.net.au [mailto:ozaprs-bounces@aprs.net.au] <b>On Behalf Of </b>Andrew Rich<br><b>Sent:</b> Thursday, 10 March 2011 04:57<br><b>To:</b> Australian APRS Users<br><b>Subject:</b> Re: [OZAPRS] FW: Was Something is wrong, this is a fixed location....Now, we fixed it..<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Why should a time stamp make a difference ?</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>You haven't moved</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p></div><blockquote style='border:none;border-left:solid black 1.5pt;padding:0cm 0cm 0cm 4.0pt;margin-left:3.75pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt'><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>----- Original Message ----- <o:p></o:p></span></p></div><div><p class=MsoNormal style='background:#E4E4E4'><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> <a href="mailto:gordon.t@internode.on.net" title="gordon.t@internode.on.net">Gordon Taylor</a> <o:p></o:p></span></p></div><div><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>To:</span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> <a href="mailto:ozaprs@aprs.net.au" title="ozaprs@aprs.net.au">'Australian APRS Users'</a> <o:p></o:p></span></p></div><div><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Sent:</span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> Wednesday, March 09, 2011 8:33 PM<o:p></o:p></span></p></div><div><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Subject:</span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> [OZAPRS] FW: Was Something is wrong, this is a fixed location....Now,we fixed it..<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p></div><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 lang=EN style='color:black'><o:p> </o:p></span></span></p><p class=MsoNormal><span class=rawline><span lang=EN style='color:black'><o:p> </o:p></span></span></p><p class=MsoNormal><span class=rawline><span lang=EN style='color:black'>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 lang=EN style='color:black'><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 lang=EN style='color:black'><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 lang=EN-US style='font-size:10.0pt;font-family:"Trebuchet MS","sans-serif";color:#310900'>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 class=MsoNormal align=center style='text-align:center'><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><hr size=2 width="100%" align=center></span></div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>_______________________________________________<br>OZAPRS mailing list<br>OZAPRS@aprs.net.au<br>http://lists.aprs.net.au/mailman/listinfo/ozaprs<o:p></o:p></span></p></blockquote></div></body></html>