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[aprssig] "Out-of-order" data on APRS-IS

J T w0jrt at yahoo.com
Tue Aug 9 18:11:29 UTC 2005


Pete,
Keep in mind Mark said this problem also happens when
no digipeaters are involved -- i.e. cases where
multiple I-gates hear the same packet directly.

I, too, have seen long-delayed packets.  Here's one
example:
20050720210800,W0JRT-14>APRS,WIDE1-1,WIDE2-1*,qAR,KA2FNK:!3856.46N/09450.50Wk090/055N
20050720211101,W0JRT-14>APRS,WB0HAC,WIDE1*,WIDE2-1,qAR,KA2FNK:!3856.50N/09446.67Wk093/059N
20050720211134,W0JRT-14>APRS,WIDE1-1,WIDE2-1,qAo,W0JRT:!3856.78N/09446.25Wk340/059N
20050720211301,W0JRT-14>APRS,WB0HAC,WIDE1*,WIDE2-1,qAR,KA3NAM-11:!3856.39N/09451.04Wk044/054N
20050720211301,W0JRT-14>APRS,WIDE1-1,WIDE2-1,qAo,W0JRT:!3858.15N/09446.55Wk015/047N
20050720211134,W0JRT-14>APRS,WIDE1-1,WIDE2-1,qAo,W0JRT:!3856.78N/09446.25Wk340/059N
20050720211301,W0JRT-14>APRS,WB0HAC,WIDE1*,WIDE2-1,qAR,KA3NAM-11:!3856.39N/09451.04Wk044/054N
20050720211301,W0JRT-14>APRS,WIDE1-1,WIDE2-1,qAo,W0JRT:!3858.15N/09446.55Wk015/047N
20050720211334,W0JRT-14>APRS,WIDE1-1*,WIDE2-1,qAo,KC5YTI-15:!3858.26N/09446.37Wk089/018N
20050720211350,W0JRT-14>APRS,WIDE1-1,WIDE2-1,qAR,KA3NAM-11:!3856.46N/09450.50Wk090/055N
20050720211635,W0JRT-14>APRS,WIDE1-1,WIDE2-1,qAo,W0JRT:!3858.29N/09445.53Wk126/000N
20050720211726,W0JRT-14>APRS,WIDE1-1,WIDE2-1,qAo,W0JRT:!3858.27N/09445.54Wk267/015N
20050720211738,W0JRT-14>APRS,WB0HAC,WIDE1*,WIDE2-1,qAR,KA3NAM-11:!3856.50N/09446.67Wk093/059N
20050720211758,W0JRT-14>APRS,WIDE1-1,WIDE2-1,qAo,W0JRT:!3858.23N/09445.66Wk178/031N
20050720211852,W0JRT-14>APRS,WIDE1-1,WIDE2-1,qAR,KA3NAM-11:!3856.78N/09446.25Wk340/059N

Look at the first packet and the one at time 1350. 
KA3NAM-11 heard the packet DIRECTLY and still reported
it 5 minutes and 50 seconds later than KA2FNK who
heard the packet via TWO digipeater hops.

Another example: The packets at times 1134 and 1852
are identical, and both were heard directly by two
I-Gates (W0JRT and KA3NAM-11).  No digipeaters were
involved.  However, KA3NAM-11 reported the packet 7
minutes and 18 seconds later than W0JRT.

For several days I noticed this behaviour, and in
every case the delayed packets were always I-gated
through the same station (KA3NAM-11).

I sent Joe (KA3NAM) e-mail about this and he said he'd
look into it.  The problem went away, but I never
heard back from Joe so I'm not sure what (if anything)
he changed.

-Jerome
W0JRT



		
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