[amsat-bb] ISS packet

[JoAnne Maenpaa]

You may notice that this paper dates from 2012. The setup is the same but
equipment changes aboard the ISS have occurred since then ...

> ... space activities using the strong and
> predictable downlink of the ISS.

The packet signal from the 5W Ericsson HT nowadays is considerably weaker
than back in 2012 when a Kenwood rig was operational. I use the APRS
terrestrial frequency on 144.390 for testing. I found it works on the
terrestrial signals it will work on the ISS downlink. Also, here in Chicago
area 144.390 is so full of signals that I receive something every 5 seconds
at least.

The one gotcha with AGWPE or UZ7HO modem software is that these will only
print a fully decoded packet (one with the checksum intact). On a hardware
TNC you can set the PASSALL to ON and you will see all packets, even the
one's with errors but your eye/brain connection can still read them.

The weak downlink from ISS packet means I will often hear a packet by ear
but my UZ7HO and UISS combo will not decode/display. Hope this information
saves some frustration in that your setup may be correct. See what you get
on 144.390 for a confidence builder!

--
73 de JoAnne K9JKM
k9jkm at amsat.org
AMSAT VP User Services


> -----Original Message-----
> From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
> Behalf Of E.Mike McCardel
> Sent: Tuesday, February 24, 2015 8:35 AM
> To: Steve Kristoff
> Cc: amsat-bb at amsat.org
> Subject: Re: [amsat-bb] ISS packet
> 
> Steve,
> 
> Have you reviewed JoAnne Maenpaa's, K9JKM, paper that she wrote for
> Symposium a couple years back. The abstract reads:  This article is
> aimed toward introducing new Amateur Radio Satellite operators to
> ARISS packet operations using radio equipment that they may already
> own. This is intended to be a guide to repurposing their terrestrial
> equipment for a start on space activities using the strong and
> predictable downlink of the ISS.
> 
> It can be found at:
> http://www.ariss.org/uploads/1/9/6/8/19681527/k9jkm_2012_symposium_ver2.
> pdf
> 
> 73,
> EMike
> E. Michael McCardel, KC8YLD
> V.P. for Educational Relations, AMSAT-NA
> 
> Have you donated to get your Fox-1 Challenge Coin Yet?
> http://www.amsat.org/?p=3275
> 
> 
> On Mon, Feb 23, 2015 at 5:30 PM, Steve Kristoff <skristof at etczone.com>
> wrote:
> > OK. Is there actually any way for an old man who only sort of knows
> > computers to actually do packet on the ISS?
> > I have tried MixW, UISS, AGWPE, UZ7?? soundmodem, and they all have me
> > baffled.
> >
> > I have MixW set up to do PSK31 and MMSSTV does a good job on the SSTV
> from
> > ISS, so I'm not completely computer ignorant.
> > Is there a user friendly packet program, that only requires one
> download
> > and has an easy set-up?
> >
> > Steve AI9IN
> > _______________________________________________
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