[Xastir] IGating

[Greg Eigsti]

Looking at the DB0ANF page I realized that the report is named "APRS  
Stations using USAM as their Digi / Uplink" - this appears to mean  
that the report shows stations that were either digi'ed OR iGated by  
a particular station.  So it appears that I was in error to believe  
that DB0ANF reports only on who your station iGates - it also  
includes the stations that you digi as well.  This still does not  
answer yesterday's question about stale data on Findu (ran the  
experiment again today and Findu/DB0ANF are showing parity).

Now my question is why are my packets not being put on the internet  
by my local iGate and being put on the internet by another after  
being digi'ed by my iGate/digi???

I guess it is time to take an in depth look at Xastir's iGate logging  
capabilities.  That will have to wait for a bit though as life has  
other duties for me to complete first ;)

Greg

On Aug 25, 2007, at 10:55 AM, James Ewen wrote:

> On 8/24/07, Greg Eigsti <greg at eigsti.com> wrote:
>>>>> How do I use Findu to see if I am IGating?
>>>
>>
>> The tool mentioned by VE7MKF is a better iGate 'test' than Findu.
>> However if you know you are iGating someone (or think you are) you
>> can look them up in findu and see their raw data.  Just change the
>> callsign to the one that you are interested in...
>
> Greg,
>
> You have made an incorrect supposition above. The information seen at
> DB0ANF and at findu.com are the same. You will not find more
> information about who has i-gated a station via findu than you will at
> DB0ANF. The both use the same source of packets.
>
> The APRS-IS filters duplicate packets as they are received. Only the
> first packet received by the APRS-IS is kept. Any duplicates of that
> same packet are dropped.
>
> If you look at raw data for a station via any internet server, you
> will only see one copy of the packet, unless for some reason the
> packet has been mangled somewhere along the way.
>
> We run 3 or 4 i-gate stations in Edmonton. My station has a good
> vantage point, and usually is the first to gate to the internet. When
> my Windows based station locks up, then you will see stations gated by
> VE6AEW. When his station is turned off, you might see stations gated
> by VE6PS.
>
> When all the stations are up and running, only the first station to
> gate to the internet is the one seen.
>
> High altitude balloon launches show this phenomenon quite well. Our
> SABLE-III balloon launch on Aug 11 under the call VA6TNY-11. If you
> look at the historical track of that callsign at http://aprs.he.fi,
> you will see that it was gated by my station, VE6DJJ in Calgary,
> VE6BLK on Grande Prairie, VE6CNO in Crowsnest Pass, and even VE7EOK,
> and VE7CHW in Kamloop, BC.
>
> Kamloops is 600 km away. The balloon was heard by many more stations
> that act as i-gates, but only the first to gate to the internet is
> recorded by the APRS-IS.
>
> Go to file and click the button beside IGate logging.
>
> Enable IGate logging
> Logs all data forwarded in both directions, and rejected forwards  
> with reasons
> for rejection. Includes NWS messages forwarded to RF.
>
> Your log file will then show you if you are or are not gating to  
> the internet.
>
> James
> VE6SRV
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