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[aprssig] Curious about bogus packets on Findu

Steve Noskowicz noskosteve at yahoo.com
Thu Sep 30 17:19:03 UTC 2010



I'll try that, later, thanks.  Still inpacking.


--
 73, Steve, K9DCI   USN (Vet) MOT (Ret) Ham (Yet)
--- On Thu, 9/30/10, Lynn W. Deffenbaugh (Mr) <ldeffenb at homeside.to> wrote:

> I'm just guessing here, but I suspect
> that those areas have a digi or 
> IGate running in PASSALL mode that has the ability to
> corrupt single 
> digits in an APRS packet.  aprs.fi has a sanity filter
> that removes 
> "impossible" packets that appear to have traveled too fast,
> which is 
> what these would look like.  If you pull up the raw
> packets (as many as 
> might be available) in aprs.fi, are there any flagged that
> way?
> 
> Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile
> and Win32
> 
> Steve Noskowicz wrote:
> > Returned from a week long Illinois-Colorado trip last
> night (15 hrs straight through and I can't figure out why
> I'm not one giant ache) (:-)
> >
> > For anyone wanting to look...or who cares.  It's
> no problem for me, just wondering.
> >
> >
> > Noticed some error lat long locations on Findu's Long
> term tracking.   I've not seen this before.
> > I save some of these images to show with my APRS
> talks.
> >
> > http://www.findu.com/cgi-bin/track.cgi?call=k9dci-9&start=400&geo=usa.geo
> >
> >
> > The one in North Western Pa is early in the time
> period.
> > The one in SE Wisconsin (and the one below the track
> in Illinois) is late in the trip and is probably a
> latitide-only glitch from one of the packets at the same
> longitude.  I figured this out by changing the findu
> &start time in Steve's URL.
> > However, it is difficult for me to tell looking at the
> raw data just which packet it is.
> > I also see some raw packets with the TOCALL (APK101)
> instead of the Mic-e data and don't know enough to
> understand that.
> >
> > I couldn't see these glitches on aprs.fi.
> >
> >
> > --
> >  73, Steve, K9DCI   USN (Vet) MOT
> (Ret) Ham (Yet)
> >   
> 
> 
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