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[aprssig] emergency beacon wide1-1ADDENDUM

Steve Noskowicz noskosteve at yahoo.com
Sun Mar 15 03:00:39 UTC 2009



I did alittle more snooping and noticed that the compressed and non-compressed packets are quite different times...
2009 03-14 02 59:53,WIDE1-1>N9MXQ-8... compressed ... TinyTrak3
2009 03-14 14 36:43,WIDE1-1>N789PH...  compressed ... KD0CVN-1 RV-9A
2009 03-14 16 00:05,WIDE1-1>N9MXQ-8...  A=000764
2009 03-14 16 03:00,WIDE1-1>N9MXQ-8...  A=000803

Also, that the un-compressed altitudes are pretty low for around here - groung level is 800-900 MSL.  Are those the MI locations?

--
73, Steve, K9DCI
You know that sea of entropy we were going to drown in?  Well, upon closer examination, it turned out to be ignorance.  S. Noskowicz 1987


--- On Sat, 3/14/09, Steve Noskowicz <noskosteve at yahoo.com> wrote:

> From: Steve Noskowicz <noskosteve at yahoo.com>
> Subject: Re: [aprssig] emergency beacon called wide1-1 today
> To: "TAPR APRS Mailing List" <aprssig at tapr.org>
> Date: Saturday, March 14, 2009, 9:36 PM
> Hi guys,
>    
>  I did a little snooping of these packets to see if any of
> this stuff stuck (in my head), and I may or may not be
> confused.  So am I getting warm?
> 
>  It's Saturday 8:40 pm and I know I'm after the
> fact and not an expert, but looking at the raw packets on
> Findu with the time stamp (...&time=1)
> 
> 1 - I don't know the TT#, so,   is this an APRS
> message?
> 20090314025953,WIDE1-1>N9MXQ-8,WIDE2-1,qAR,W9DRR-10:>TinyTrak3
> v1.1
> 
>   ANYWAY, on the next one, isn't this a Mic-E packet
> (it "looks" like one)?
> 20090314143643,WIDE1-1>N789PH,WIDE2-1,qAR,W9DRR-10:`tR7+{A'/"S)}KD0CVN-1
> RV-9A
>   THEREFORE isn't the "N789PH" Mic-E DATA
> (destination address field - Latitude digits) that only
> LOOKS like an "N" number ??
>   Checking the spec, "N" isn't a valid Mic-E
> Destination Address field character (if I read the spec
> correctly M, N and O are skipped) - this is mangled data, no
> ??
> 
> Then, these next two are NOT in a compresssed format!  Can
> TT-3 do both?  
> 20090314160005,WIDE1-1>N9MXQ-8,WIDE2-1,qAR,W9DRR-10:!4215.42N/08850.45W>001/000/A=000764
> 20090314160300,WIDE1-1>N9MXQ-8,WIDE2-1,qAR,W9DRR-10:!4216.03N/08851.01W>326/007/A=000803
>    I didn't bother to check, but they do look near me
> somewhere.
> 
> Now let's look at the time [my punctuation] of that
> second "N" number packet:
> 2009 03-14 14:36:43   [cont next line]
> ,WIDE1-1>N789PH,WIDE2-1,qAR,W9DRR-10:`tR7+{A'/"S)}KD0CVN-1
> RV-9A
> 
> Then, go to the findu Packets for the 'real'
> station call "N789PH" 
> around the SAME time:
> 2009 03-14 14:36:40   [cont next line]
> ,N789PH>TR1P3Y,N9ZIP-15,N8IYX-4,WIDE2*,qAR,NK8X-3:`tW$+qA'/"S*}
> 
>   Now, comparing the two Mic-E Information data (Longitude
> digits) fields, WIDE1-1     `tR7+{A'/"S)  
> N789PH      `tW$+qA'/"S*}
>   I realize that it is too late in the day to attempt this
> field and quit.
> 
>   Is this a matter of confusing two different stations
> because of the mangled Mic-E Latitude (Destination address
> field) data - that "looks" like the N-number ? 
> Huh?
> 
> My brain hurts.
> --
> 73, Steve, K9DCI
> You know that sea of entropy we were going to drown in? 
> Well, upon closer examination, it turned out to be
> ignorance.  S. Noskowicz 1987
> 
> 
> --- On Sat, 3/14/09, Rusty Hemenway
> <nnn0fjk at gmail.com> wrote:
> 
> > From: Rusty Hemenway <nnn0fjk at gmail.com>
> > Subject: Re: [aprssig] emergency beacon called wide1-1
> today
> > To: "'TAPR APRS Mailing List'"
> <aprssig at tapr.org>
> > Date: Saturday, March 14, 2009, 8:21 PM
> > Is there someone in the area that can give him a call
> and
> > help him set it up
> > correctly? 
> > 
> >  
> > 
> > From: aprssig-bounces at tapr.org
> > [mailto:aprssig-bounces at tapr.org] On Behalf
> > Of Greg D.
> > Sent: Saturday, March 14, 2009 5:43 PM
> > To: aprssig at tapr.org
> > Subject: Re: [aprssig] emergency beacon called wide1-1
> > today
> > 
> >  
> > 
> > Last position (about 30 min ago) shows the plane in
> front
> > of the hangar at
> > the Anoka County airport.  Presumably he'll be
> home
> > soon.  Google says it's
> > about a 20 minute commute.
> > 
> > Greg  KO6TH
> > 
> > 
> > > From: ve7gdh at rac.ca
> > > To: aprssig at tapr.org
> > > Date: Sat, 14 Mar 2009 13:17:29 -0700
> > > Subject: Re: [aprssig] emergency beacon called
> wide1-1
> > today
> > > 
> > > Chuck W3YNI wrote...
> > > 
> > > Subject: Re: [aprssig] emergency beacon called
> wide1-1
> > today
> > > 
> > > > Actually spoke to some folks from CAP. Gave
> them
> > what I believed
> > > > was the tailnumber at the time (now
> confirmed)
> > along with last known
> > > > coordinates from the beacon.
> > > >
> > > > Guy I spoke to is a ham and knew what APRS
> is -
> > he sent it up the
> > > > chain.
> > > 
> > > and posted by Rusty (K1GGS?)...
> > > 
> > > >
> >
> WIDE1-1>N789PH,WIDE2-1,qAR,W9DRR-10:`tR7+{A'/"S)}KD0CVN-1
> > RV-9A
> > > 
> > > The odd thing is that the "callsign" is
> > WIDE1-1 and N789PH (presumably
> > > the tail number) is the destination instead of
> the
> > "callsign". The
> > > owners callsign appears to be KD0CVN as indicated
> in
> > the status text.
> > > Don't know why he would include an SSID
> there!
> > Also according to the
> > > status text, it's an RV-9A.
> > > 
> > > I know the above doesn't show a path of
> WIDE1-1,
> > but looking at the
> > > tracker that IS using a "callsign" of
> > N789PH...
> > > 
> > >
> http://aprs.fi/?c=raw&call=N789PH&limit=1000
> > > 
> > > it is using a path of WIDE1-1,WIDE2-1. Surely if
> it
> > really is a plane
> > > wouldn't use a path of WIDE1-1,WIDE2-1 - hi!
> > > 
> > > Also, looking at
> > http://aprs.fi/?c=raw&call=WIDE1-1&limit=50
> > > it is possible that there is more than one
> station
> > with a misconfigured
> > > "callsign" of WIDE1-1.
> > > 
> > > 2009-03-14 14:36:43 UTC:
> > > WIDE1-1>N789PH,WIDE2-1,qAR,W9DRR-10
> > > :`tR7+{A'/"S)}KD0CVN-1 RV-9A [Invalid
> > characters in mic-e packet]
> > > 
> > > There's that "KD0CVN-1 RV-9A"
> again...
> > or possibly it's one and the same
> > > beacon. What a tangled web it is!
> > > 
> > > The callsign of WIDE1-1 must have been programmed
> in
> > accidentally. While 
> > > it is possible that a mangled MIC-E packet may be
> > involved for the 
> > > "emergency" beacon, perhaps it would be
> a
> > good recommendation for planes 
> > > to not use MIC-E to lessen the chance of a
> mangled
> > MIC-E packet making 
> > > it look like an emergency beacon. Just a thought.
> > > 
> > > 73 es cul - Keith VE7GDH
> > > --
> > > "I may be lost, but I know exactly where I
> > am!"
> > > 
> > > 
> > > _______________________________________________
> > > aprssig mailing list
> > > aprssig at tapr.org
> > >
> https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
> > 
> >   _____  
> > 
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> > meet. Check it out.
> >
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> > 
> > 
> > _______________________________________________
> > aprssig mailing list
> > aprssig at tapr.org
> > https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
> 
> 
>       
> 
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