[amsat-bb] ISS APRS with an HT

[Brian Wilkins KO4AQF]

That makes sense to me and I will contact him. He is my neighbor. What I am
not clear on is why all of a sudden it stopped working when it was working
prior to the ISS APRS shutdown. It may also explain why when I see you
(K4KDR) and send messages via the ISS (or what I am told is being
digipeated because my radio gets a message that the ISS received it) you
never see them. I have been trying off and on for a couple months now to
reach you. I have successfully reached N1RCN on multiple occasions.


On Wed, Mar 25, 2020 at 8:59 PM Scott via AMSAT-BB <amsat-bb at amsat.org>
wrote:

> Hi Brian & everyone.
>
> Websites like ARISS.net monitor the APRS traffic and display a list of
> packets that match certain criteria.  In the case of a site that wants to
> display packets digipeated via the ISS, they're looking for "RS0ISS*",
> which is appended to the digipeat path of a packet that is relayed thru the
> ISS.
>
> When it works correctly, you transmit a packet that is digipeated by the
> ISS and the digipeat from the ISS is heard by an iGate that puts it onto
> the internet for sites like ARISS.net to display.
>
> However, generally speaking, the APRS network is designed to toss out
> "duplicate" packets.  And as you might imagine, it's
> first-come-first-served.
>
> If you'll notice on the following link to a screen shot:
>
> https://www.qsl.net/k/k4kdr//images/KO4AQF-digipeats.png
>
> ... the vast majority of your packets are being heard DIRECTLY by in iGate
> run by W4GCW.  So, a good portion of the time, when you get digipeated via
> the ISS, the APRS network considers that a duplicate and it's discarded.
> YOU (and others) might hear it off the air, but it'll never show up online
> anywhere.
>
> In the same image you can contrast those locally heard packets with packets
> that were digipeated & uploaded by iGate's KE4AZZ-3 & KC5ILO-12... of
> course that's how it's supposed to work.
>
> You might want to reach out to W4GCW to see if he'll filter out your call
> sign on his iGate to give your digipeated packets a chance to be heard by
> an iGate and get forwarded onto the greater APRS network as DIGIPEATS
> (instead of being discarded as duplicates).
>
> -Scott,  K4KDR
>
> ==========================
>
> On Wed, Mar 25, 2020 at 7:30 PM Brian Wilkins KO4AQF via AMSAT-BB <
> amsat-bb at amsat.org> wrote:
>
> > I had no issue until it went offline and then came back. I believe one of
> > the iGates near me may have went offline since the ISS APRS pause as ISS
> is
> > confirming my messages however nothing is showing up on ariss.net and I
> > can
> > exchange messages with others. I am considering building my own APRS RX
> > iGate from an RTLSDR and Raspberry Pi just to digipeat my own packers
> back
> > to APRS.fi website
> >
> > On Wed, Mar 25, 2020 at 7:22 PM John Brier via AMSAT-BB <
> > amsat-bb at amsat.org>
> > wrote:
> >
> > > I got through it on March 21st on a 12 degree pass using a TH-D72 and
> an
> > > Arrow:
> > >
> > > https://twitter.com/SpaceComms1/status/1241598936814694400?s=19
> > >
> > > It was hard, as I believe it is a little deaf or not decoding
> > consistently
> > > based on past reports. Some have said it seems to be easier with
> Kenwood
> > > radios.
> > >
> > > They are sending up a new Kenwood radio system soon that supports
> > > digipeater ops so don't dismiss this mode entirely!
> > >
> > > 73' John Brier KG4AKV
> > >
> > > On Wed, Mar 25, 2020, 19:02 Steve Kristoff via AMSAT-BB <
> > > amsat-bb at amsat.org>
> > > wrote:
> > >
> > > >
> > > >  Has anyone been able to digipeat APRS through the ISS with a 5 watt
> HT
> > > > and an Arrow antenna lately? If so, what are your secrets for
> success?
> > > > If 5 watts and an Arrow doesn't work please let me know that, too,
> so I
> > > > can pursue a different aspect of our hobby.
> > > > thanks!
> > > > Steve AI9IN
> > > > Grid EM79ji
> > > > Oldenburg IN 47036
> > > >
> > > > _______________________________________________
> >
> >
> >
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-- 
Brian Wilkins
KO4AQF