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[aprssig] More aloha circle questions

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Wed Nov 16 20:23:31 UTC 2011


Can you provide some specific packet examples of stations you're asking 
about?  And are you receiving them via an APRS-IS stream or via an RF 
source?

If you only know about a station because of a directly-injected 
TCP/IP-transported position packet from that station, then I don't think 
it deserves an aloha circle.  It's probably just an APRS-IS connected 
client viewer.

BUT, if you can detect NON-TCP/IP packets gated THROUGH that station, 
then it's acting as an IGate and you've got something to sink your teeth 
into for calculating an aloha circle.

As I understand it (I haven't implemented Aloha yet, but you might want 
to pull down the latest development version of APRSISCE/32 to take a 
look at my realtime Path display), the aloha circle isn't about the 
station itself, but about what the station can hear and/or be heard by.  
A directly APRS-IS-injecting station isn't going to show up on APRS-IS 
as being heard by anyone, it's potentially transmitted RF packets will 
be dupe-filtered on reception.  But you can draw some conclusions 
(faulty as they might be) based on both the direct and or digipeated 
packets that are gated by a station.

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

On 11/16/2011 3:10 PM, Andrew P. wrote:
> But what if the station's first digipeater was RF and it has an AX.25-compliant (numeric 0 to 15) SSID? At my home, the reception is so bad, I hear almost all the local stations via one of 3 digipeaters I can hear direct, and the huge number of local I-gates almost guarantees they will go over the Internet to be relayed a net total of under 10 miles.
>
> ------Original Message------
> From: Lynn W. Deffenbaugh (Mr)
> To: aprssig at tapr.org
> Sent: Nov 16, 2011 3:02 PM
> Subject: Re: [aprssig] More aloha circle questions
>
>
> If the packet has TCPIP or TCPXX anywhere in it's path, I'd say don't do
> anything to them that is RF-specific because they're not really on RF.
>
> Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
>
> On 11/16/2011 2:53 PM, Andrew P. wrote:
>> I'm looking at maps in my application, and noticing reports from stations that can't possibly be APRS radio transmitters, because they have letters and/or multiple characters in their SSID (also noticed their path states they were forwarded over the Internet). Presumably, such "stations" shouldn't get range circles or be counted in aloha circle computation.,
>>
>> For example, in my area look up WA3NOA-RD and WA3NOA-RI (K3JSE-RI and K3JSE-RD, too).
>>
>> What should be the correct handling of such stations?
>>
>> Andrew Pavlin KA2DDO
>> Sent from my Verizon Wireless BlackBerry
>>
>>
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