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[aprssig] Help with q-Constructs

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Wed May 16 21:26:32 UTC 2012

I thought APU25N (shows as UI‑View32 V2.03 at 
http://nebraska.aprs2.net:14501) was the latest (read: last) available 
UI-View version? Or are you saying that none of the UI-View versions 
(because they're "older") do the I or qAR constructs?

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

On 5/16/2012 5:08 PM, Pete Loveall AE5PL Lists 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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