[amsat-bb] Thoughts on ISS packet switch back to 145.825 MHz (long)

Tue Apr 18 00:30:08 UTC 2017

Well Mike,

Here is my log from the last pass. It shows 29 digipeats (~75% decoding
success at my station) for 8+ minutes. Each packet is barely 1 1/2 seconds!
That is a utilization of less then 5% assuming my math is correct.

In addition, asking for "blacklisting of licensed operators" is something I
certainly will not support and fortunately neither does the FCC.

73, Stefan, VE4NSA

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Fm VE6PW To U1PSWQ Via RS0ISS,ARISS <UI pid=F0 Len=32 >[18:47:59] `*Zvl
_-/` Hello  via  ISS   _%

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Fm KD0KZE To TUPX8Y Via RS0ISS <UI pid=F0 Len=49 >[18:50:17] `yaHl _-/
Greetings via ISS from Circle Pines MN

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Greetings via ISS from Circle Pines MN

Fm W8LR To APK003 Via RS0ISS <UI pid=F0 Len=40 >[18:50:35] :KD0KZE   :599
Via ISS de W8LR Jerry{62

Fm KD0KZE To TUPX8Y Via RS0ISS <UI pid=F0 Len=49 >[18:50:39] `yaHl _-/
Greetings via ISS from Circle Pines MN

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Via ISS de W8LR Jerry{63

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Greetings via ISS from Circle Pines MN

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Greetings via ISS from Circle Pines MN

Fm W8LR To APK003 Via RS0ISS <UI pid=F0 Len=40 >[18:52:10] :KD0KZE   :599
Via ISS de W8LR Jerry{62

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On Mon, Apr 17, 2017 at 4:51 PM, Mike Diehl <diehl.mike.a at gmail.com> wrote:

> Greg,
>
> You make a good point about the complications of dropped packets. I have
> some good recordings of voice stations getting a call back when as little
> as a single letter of their call was heard. It's amazing how well we can
> learn the voices of other ops when you're on regularly. This simply doesn't
> happen on packet.
>
> Another complication is that it is on simplex. That means on a 10 minute
> pass the maximum amount of time possible to digipeat is 5 minutes if the
> channel is fully saturated. Subtract out the ISS beacons we end up with
> less than 50% of the pass available for ISS to hear you.
>
> I'm not sure what the best solution is. You do bring up an interesting
> point about APRS-IS. Maybe it's possible to have them black list fixed
> beacon stations and remove the vanity aspect like you mentioned.
>
> 73,
>
> Mike Diehl
> AI6GS
>
> > On Apr 17, 2017, at 1:26 PM, Greg D <ko6th.greg at gmail.com> wrote:
> >
> > Gabriel Zeifman wrote:
> >> It's not complicated. However much it may be insisted ISS packet is not
> >> SO-50, it is practically the same thing (single channel operating on
> FM).
> > Actually, the ISS digi is worse.
> >
> > With voice communication, one can sometimes pick up the start or tail of
> > a call sign, as the astronaut demonstrated, and use that to filter a
> > second try.  With digital, any bits that get corrupted result in no
> > reception at all.
> >
> > I hate to suggest this, and admit I am assuming a cause without
> > supporting evidence, but it might be necessary to remove the "vanity"
> > aspect of ISS digipeating, and take down or hide from general view the
> > reporting sites that support it.  While a useful tool for
> > troubleshooting, I suspect the vanity aspect of seeing your call in a
> > public list day after day from an unattended station may be too strong a
> > draw for some, resulting in the clogged channel.  The SatGates that
> > monitor for ISS and other APRS satellite traffic are still important
> > part of the infrastructure, so that the information can be datamined
> > from APRS-IS if you need it for troubleshooting.  But the consolidated
> > lists of who has been seen digipeating through the ISS, I think, may be
> > contributing more trouble than they are worth.
> >
> > Greg  KO6TH
> >
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