[amsat-bb] Help decoding/understanding terrestrial packet heard on ISS freq 145.825 MHz

[Jeff Moore]

Basically they are AX.25 packets NOT APRS packets.  I know that on my radio
(D710), the setup to work the ISS via packet is different from the normal
APRS setup.  It's been a while since I've done either on that radio, but I
do know that the setups are mutually exclusive.

Jeff Moore  --  KE7ACY

On Fri, May 1, 2015 at 3:17 PM, David L Warnberg <dwarnberg at verizon.net>
wrote:

> John,
>         Almost forgot... those are basically APRS packets you are hearing..
> so to test your setup prior to waiting for the ISS to fly over tune your
> radio to 144.39 to listen a test the software...
>
> Then when it's working to your satisfaction tune back over to the ISS data
> and listen away...
>
> Thanks
>
> David
>
> -----Original Message-----
> From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of David L
> Warnberg
> Sent: Friday, May 01, 2015 5:45 PM
> To: 'John Brier'; 'AMSAT BB'
> Subject: Re: [amsat-bb] Help decoding/understanding terrestrial packet
> heard
> on ISS freq 145.825 MHz
>
> For the packet data take a look at UISS software... also for those SSTV
> transmissions from the ISS look at RX-SSTV..
>
> You will also need a packet engine...
>
> Here is what I use
>
> Packet Engine Pro  web site = http://www.sv2agw.com/ UISS and RX-SSTV  web
> site = http://users.belgacom.net/hamradio/
>
> Hope this helps
>
> 73's
> David
> KK4QOE
>
> -----Original Message-----
> From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of John Brier
> Sent: Friday, May 01, 2015 5:18 PM
> To: AMSAT BB
> Subject: [amsat-bb] Help decoding/understanding terrestrial packet heard on
> ISS freq 145.825 MHz
>
> Thanks for all the responses on SO-50 preamps and portable setups. I'm
> still
> digesting the info.
>
> TL;DR: I heard automated packet transmissions on the ISS packet frequency
> when the ISS wasn't in sight and recorded them to try and figure out
> who/what they are, but my software isn't decoding anything.
> Can you help me understand what they were, or even better, decode them
> yourself?
>
>
> http://cupcakecarnival.net/sites/default/files/New_Jersey_Terrestrial_Packet
> _145825_2015-04-30-1540_UTC_one.wav
>
>
> http://cupcakecarnival.net/sites/default/files/New_Jersey_Terrestrial_Packet
> _145825_2015-04-30-1540_UTC_two.wav
>
>
> Here's another question that has me excited:
>
> Yesterday after having visited with family in Maplewood, New Jersey for
> several days, I drove home to North Carolina. I knew there was an ISS pass
> at 10:26 AM/1426 UTC, right when I started my trip, so I tuned to 145.825
> MHz and heard its digipeater easily.
>
> Then I left the radio on.
>
> I'm not sure where I was in NJ, but about one hour later, around 11:33 AM
> local/1533 UTC, I heard packet on the frequency again but I was confused
> because there weren't supposed to be any more passes for a while. I
> confirmed on my phone that the ISS was over some far away ocean at the time
> I was hearing these new transmissions, so I knew they must be terrestrial.
> Still, it seemed odd that someone or something was transmitting when the
> ISS
> wasn't in sight...
>
> Maybe it's an internet gateway I thought. Or do people leave their stations
> on the ISS frequency 24/7 so they can "work" any pass that happens?
>
> I tried recording videos of the transmissions for later decoding to figure
> out who or what it was. Eventually I realized it was transmitting every 2
> minutes. It was almost certainly an automated setup, adding credence to the
> idea that this was an internet gateway.
> Unfortunately, before I realized that, and after recording one video of it,
> the best reception I received during my drive by "pass," I wasn't
> recording.
> As I drove further away it only got weaker and weaker. I did manage to get
> two half way decent recordings of it, but I have tried decoding them with
> Soundmodem on Windows and it's not printing out anything like it normally
> does. I am very new to packet, only becoming interested in it because the
> ISS uses it, so I thought maybe someone else might be more equipped to
> decode it. Or certainly someone could shed some light on what I heard,
> maybe
> the operator in NJ is on this list.
>
> I used Audacity to record the audio off the videos I made as well trim and
> amplify the audio, but I haven't done anything else, though if someone
> wants
> the unedited videos I can put them up too.
>
>
> http://cupcakecarnival.net/sites/default/files/New_Jersey_Terrestrial_Packet
> _145825_2015-04-30-1540_UTC_one.wav
>
>
> http://cupcakecarnival.net/sites/default/files/New_Jersey_Terrestrial_Packet
> _145825_2015-04-30-1540_UTC_two.wav
>
> John Brier, KG4AKV, Raleigh, NC, FM05
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> _______________________________________________
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> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
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