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[aprssig] Help with q-Constructs

John Gorkos jgorkos at gmail.com
Wed May 16 21:17:48 UTC 2012


Thank you.  The q-algo doc is indeed chock full of goodness, and I'm sure
understanding the behavior of "legacy" clients like UI-View makes seeing
the big picture significantly easier.  Thanks to you and Lynn for steering
my clear of the rocks.

John Gorkos


On Wed, May 16, 2012 at 5:08 PM, Pete Loveall AE5PL Lists <
hamlists at ametx.com> wrote:

> KC0WIF-1 is running an older version of UI-View
> (KC0WIF-1>APU25N,TCPIP*,qAC,T2NBRASKA:=4427.76NI10021.45W&APRS iGate -
> Pierre, SD) and is not using either the I or qAR construct.  That is why
> you see qAS.  T2NBRASKA knows the packet is being passed to it by KC0WIF-1
> and, according to the q algorithm, can only assume that KC0WIF-1 is a
> server since there is no IGate indicator in the path.
>
> Hope this helps.
>
> 73,
>
> Pete Loveall AE5PL
> pete at ae5pl dot net
>
>
>
> > -----Original Message-----
> > From: John Gorkos
> > Sent: Wednesday, May 16, 2012 2:54 PM
> >
> > I'm working on the javAPRSlib parsers again, and I need a little help
> > understanding the Q-constructs as injected by the APRS servers.
> > Here's a sample beacon:
> > N0NPO-1 <http://aprs.fi/?c=raw&limit=&call=N0NPO-1> >APOT21,WIDE1-
> > 1,WIDE2-2,qAS,KC0WIF-1 <http://aprs.fi/?c=raw&limit=&call=KC0WIF-1>
> > :!4422.30N/10023.30W>235/008/A=000593 13.7V  76F
> >
> >
> > So, this device is set to beacon to WIDE1-1, WIDE2-2.  According to
> Pete's q-
> > Construct page:
> > qAS - Packet was received from another server or generated by this
> server.
> > The latter case would be for a beacon generated by the server. Due to the
> > virtual nature of APRS-IS, use of beacon packets by servers is strongly
> > discouraged. The callSSID following the qAS is the login or IP address
> of the
> > first identifiable server (see algorithm).
> > (http://www.aprs-is.net/q.aspx)
> > I don't believe this is the "latter case", so what exactly has happened
> here?
> > Is this as simple as the IGATE KC0WIF-1 picking this packet up directly
> on the
> > air and sending on to APRS-IS?  If that's the case, why isn't the qAR
> construct
> > used?  is there a simple explanation of the difference, that I can put
> in my
> > "APRS for Dummies and Naval Academy Graduates" notebook?
>
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