[amsat-bb] Didn't show up on findu
skristof at etczone.com
skristof at etczone.com
Wed Dec 4 13:16:29 UTC 2019
Thanks for the good info, Scott! You helped me learn something today.
Steve AI9IN
On 2019-12-03 9:42 pm, Scott via AMSAT-BB wrote:
> Hey Steve!
>
> The sites like FINDU and APRS.fi scan the APRS internet stream for
> digipeated packets and scan for certain things.
>
> In the case of ISS digipeats, a site would be looking for packets with
> "RS0ISS*" in the digipeat path.
>
> However, the APRS-IS system as a whole rejects "duplicate" packets. It's
> first-come, first-serve if more than one i-Gate hears your packet.
> Normally that's not an issue but unfortunately it's possible to have
> packets heard directly on the ground "win" the race and report what they
> hear on up into the APRS-IS system. Packets gated directly onto the
> internet won't include the "RS0ISS*" marker that those websites are looking
> for, but rather will be marked "TCPIP".
>
> So, here's your packet from tonight's pass on the system (as seen at
> https://aprs.fi/?c=raw&call=AI9IN), but as you can see there's no mention
> of the ISS:
>
> ---------------------------
> 2019-12-03 20:07:04 CST: AI9IN>CQ,TCPIP*,qAC,T2USANW:=3921.15N/08512.30W-CQ
> de AI9IN EM79 Oldenburg IN {UISS53}
> ---------------------------
>
> ... and there are many other examples that affect others, too:
>
> ---------------------------
> 2019-12-03 20:11:05 CST:
> N1RCN>APRS,TCPIP*,qAR,KE4AZZ-4:=2701.15N/08202.30Wy de n1rcn via iss
> 2019-12-03 20:11:29 CST: N1RCN>APRS,TCPIP*,qAR,KE4AZZ-4: de n1rcn (live)
> [Unsupported packet format]
> 2019-12-03 20:11:51 CST:
> N1RCN>APRS,TCPIP*,qAR,KE4AZZ-4:=2701.15N/08202.30Wy de n1rcn via iss
> 2019-12-03 20:12:23 CST:
> N1RCN>APRS,TCPIP*,qAR,KE4AZZ-4:=2701.15N/08202.30Wy de n1rcn via iss
> 2019-12-03 20:13:01 CST: N1RCN>APRS,TCPIP*,qAR,KE4AZZ-4: de n1rcn (live)
> [Unsupported packet format]
> 2019-12-03 20:13:29 CST:
> N1RCN>APRS,TCPIP*,qAR,KE4AZZ-4:=2701.15N/08202.30Wy de n1rcn via iss
> ----------------------------
>
> ----------------------------
> 2019-12-03 20:10:23 CST: K4KDR-6>CQ,TCPIP*,qAR,KE4AZZ-4::N1RCN :Heard
> you via ISS in Montpelier, VA FM17es
> ----------------------------
>
> ----------------------------
> 2019-12-01 13:34:51 CST: WE4B>SRQX1W,TCPIP*,qAR,KE4AZZ-4:'r(<0x1d>l
> <0x1c>S\>WE4B EM62 LIVE OP
> ----------------------------
>
> ... so, it's just an issue of which iGate is able to get your digipeated
> (or heard directly on the ground) packet into the system first. If an
> iGate is hearing you directly because they live down the street, then the
> hope would be that the operator there would help out by filtering out your
> traffic & giving your digipeated packets a chance to make it onto the
> system (instead of the locally heard packet).
>
> In the case of packets that ARE digipeated by the ISS, but still win the
> race onto the network and are mis-tagged as "TCPIP*", I can only imagine
> that that's a configuration issue. The majority of iGates, upon hearing a
> digipeat from the ISS, forward it onto the APRS network in a way that you'd
> find it on those websites. I can't say that I know exactly how packets
> heard from space could get re-tagged as instead digipeated via "TCPIP".
>
> -Scott, K4KDR
>
> ========================
>
> On Tue, Dec 3, 2019 at 9:19 PM AI9IN via AMSAT-BB <amsat-bb at amsat.org>
> wrote:
>
>> I just successfully digipeated through the ISS, or so it seemed. My
>> packet came back and showed on my screen on UISS. But it didn't register
>> on the findu.com site for the space station. Why might that happen? I do
>> not believe that has ever happened to me before.
>>
>> Steve AI9IN
>>
>> Oldenburg IN
>>
>> Grid EM79
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