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

Rich/wa4bue richard.siff at verizon.net
Fri May 1 22:33:29 UTC 2015


Which program is used for APRS packet Window 7?

----- Original Message ----- 
From: "Jeff Moore" <tnetcenter at gmail.com>
To: "AMSAT BB" <amsat-bb at amsat.org>
Sent: Friday, May 01, 2015 6:28 PM
Subject: Re: [amsat-bb] Help decoding/understanding terrestrial packet heard 
on ISS freq 145.825 MHz


> 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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>> to all interested persons worldwide without requiring membership. 
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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!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
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