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<DIV><FONT face=Arial size=2>There was a delayed packet discussion specifically
concerning IGates recently. We did a through study into the problem in my area
and isolated the problem to a UI-View station operating as an IGate. Since that
discussion there were a few other folks across the country who wrote off-line
that they experienced the same issue with UI-View in their areas. This issue was
specifically limited to a UI-View IGate that was injecting packets greater than
1 minute later than another IGate using APRS+SA. Many of the packets were time
stamped to verify the delay. It was not a digipeater delay because we could see
two IGates hearing the same packet from the same digipeater being injected into
the APRS-IS greater than one minute apart.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>IGates that are experiencing delays should consider
using filtered port 14580 and limit their data to under 100 to 200km using the
m/100 to m/200 qualifier. When an IGate tries to process the full feed they
are going to run slower depending on their computer configuration and whether
they are using a dial-up feed or a high speed link.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>There are many sources of delays that also include
digipeaters. The first step is to identify if the delay is the USB to serial
converter which should be fairly easy by visual observation on how long it takes
a decoded packet to appear on the screen. Then, it becomes only a measure of
time from that point to when it appears on the APRS-IS.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>73's,</FONT></DIV>
<DIV><FONT face=Arial size=2>Tim - N8DEU</FONT></DIV>
<DIV><FONT face=Arial size=2>Huntsville, Alabama</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=w0jrt@yahoo.com href="mailto:w0jrt@yahoo.com">J T</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=aprssig@lists.tapr.org
href="mailto:aprssig@lists.tapr.org">TAPR APRS Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, August 25, 2006 1:26
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [aprssig] Delayed packets (yet
again)</DIV>
<DIV><BR></DIV>In one of the many "delayed packet" discussions there was talk
about some serial-to-USB converters causing issues. I can't seem to find
this discussion in the archives. Does anyone recall the make(s)/model(s)
of the serial-to-USB converters that are known or suspected of being
problematic? And perhaps suggest a model that is known to work
well?<BR><BR>I've been communicating with an I-gate owner whose station is
injecting delayed packets into APRS-IS. He's too busy to study and fix
the problem (unfortunately for the rest of us) so I'm trying to help gather
some information that may make it easier to debug the problem. He
swapped TNCs but that didn't fix it. He mentioned that he uses a
serial-to-USB converter so hopefully I can talk him into experimenting with a
different one or coming up with another solution.<BR><BR>-Jerome, W0JRT<BR>
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