Amateur Satellites

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Discussion about amateur reception and processing of data from artificial satellites, primarily through radio signals but data from internet resources is welcome too.

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thomasdouwes

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What could this satellite be? Seen on 2023-08-26T09:43:04Z in Slovakia at 137.71MHz. Bandwidth when modulated is 8kHz. Signal lasted a little over 4 min. (Full waterfall, baseband recording in post.) (i.imgur.com)

submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/amateursatellites

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Waterfall:
Click to view image directly

Baseband recording (cut with SDRAngel using FileSink)

When modulated, it looks like Orbcomm mobile telephony, but in that case the data bursts happen more often and there's no visible carrier.
I also didn't find anything corresponding in the Happysat's Deadsat list.

What could it be? Zombie Orbcomm satellite or something else?

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[–] [email protected] 2 points 1 year ago* (last edited 1 year ago) (2 children)

The time is in UTC (Z = Zulu = UTC) which is 11:43:04 local time. I could have made that clearer, sorry.
What did you use for the satellite tracking?

Edit: I loaded Orbcomm TLEs into Gpredict. There were Orbcomm FM18 and FM14

[–] [email protected] 2 points 1 year ago

I just realised you already said it looks like the Orbcomm signal in the post, sorry about that! I completely missed it when I made my comment.

[–] [email protected] 2 points 1 year ago

Yeah, I also use gpredict. I used the time controller to set the time.

Sorry, I forgot the Z was for UTC, I did try UTC too but there didn't seem to be any close matches.

There is also a website that shows all the satellites overhead in a time range, I'll see if I can find that again.