The main image in post was decoded with WXtoIMG as both noaa-apt and SatDump fail to synchronize it correctly.

Unprocessed image from noaa-apt:

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Waterfall:

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There you can see some breaks, the noticeable horizontal lines.

Which sounds like so (note: the waterfall shown above isn’t from the same time as audio):

Compatibility audio link

And the bonus, DSB images:

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Channels 1-20 are left-to-right then bottom.

And also AVHRR scan motor current as of today:

Compatibility image link

  • Thomas DouwesM
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    31 year ago

    Another interesting thing I noticed about these broken APT images is the channel B sync marker is repeated twice instead of the channel A marker. This is why the sync fails, and it makes a “tick tick” sound instead of the “tick tock” sound it normally makes.
    I’d love to know what is causing this, but I think only NOAA knows what is going on with that.

  • Thomas DouwesM
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    21 year ago

    You should try satdump for the DSB, it can make some nice HIRS composites.

    The scan motor current seems to be dropping, maybe it will fix itself again.

    • u/lukmly013 💾 (lemmy.sdf.org)OP
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      21 year ago

      That is from SatDump, I just put it together in JointPics.
      In this case there wasn’t anything interesting looking, at least with the pre-set composites. But to be honest, I am not sure how to use that properly. Also what’s with the vertical lines with NOAA-15? When I tried NOAA-19 I got OK results

      (Channel 20)

      • Thomas DouwesM
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        1 year ago

        That’s really strange, I checked my HIRS images from NOAA 15 and I don’t have any vertical lines, was there any nearby interference?
        It only works in day, but ch20, ch20, ch20 + ch8 * 0.1 seems to make a nice natural looking colour composite on HIRS. It’s a bit hard to see because of how low res the HIRS is, but it makes the land green and the oceans a dark blue.
        My HIRS from that pass (low elevation here):

        • u/lukmly013 💾 (lemmy.sdf.org)OP
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          21 year ago

          Nope. I also had those lines when I tried before, so I thought it’s something with the satellite. Maybe there is some interference. NOAA-19 uses different frequency for DSB. I’ll have to try with NOAA-18 (and hope it doesn’t cut off again), that should be on same frequency as NOAA-15. But I didn’t notice any interference.

          Thanks for that setting. That looks nice.

    • Thomas DouwesM
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      1 year ago

      Also, The top right of your APT image is very interesting, some of the actual corupted data seems to be getting into the APT

  • ChaoticNeutralCzech
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    1 year ago

    Wow, nevedel som, že satelity ešte stále vysielajú analógovo. Miliarda ľudí si musela vymeniť televízny prijímač a tisíce meteorológov stále ladí SSTV…

    A čo sú tie zubaté šikmé hrany v horných rohoch obrazu?

      • ChaoticNeutralCzech
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        1 year ago

        To je mi jasné, digitální vysílání bude několikanásobně efektivnější. Ale tyhle věci slyším poprvé: ten skener je pohyblivý optický senzor? Ty data o motoru jsi získal jak? Satelit je vysílá jako digitální hodnoty ve stejném pásmu?

        Edit: Holy shit, NOAA-15 je jen 25 let starý. Tou dobou už přece existoval JPEG!

        • u/lukmly013 💾 (lemmy.sdf.org)OP
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          11 year ago

          Telemetria pochádza s tadiaľto: https://www.star.nesdis.noaa.gov/icvs/status_N15_AVHRR.php
          Myslím že je to vysielané v DSB downlinku v rovnakom pásme.

          JPEG mohol existovať, ale musela by sa vymeniť existujúca technika. Tieto satelity vysielajú aj HRPT, digitálne vysielanie v pásme L so 4x vyšším rozlíšením než APT v 5 kanáloch namiesto dvoch.
          Info o príjme HRPT

          JPEG kompresiu v pásme 137MHz využíva LRPT. LRPT aktuálne vysiela len Meteor-M No. 2-3 ktorý má bohužiaľ poškodenú anténu, takže signál je dosť kolísavý.

        • u/lukmly013 💾 (lemmy.sdf.org)OP
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          1 year ago

          By the way, do you see my other reply under this (your) comment? I correctly set the comment language to Slovak, so it’s possible it got filtered out if you don’t have it in the Lemmy language settings.

          It’s not even a good comment though (mine).

  • ChaoticNeutralCzech
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    11 year ago

    Does the embedded audio work for anyone? I think it’s not even an official Lemmy/Markdown feature.

    • u/lukmly013 💾 (lemmy.sdf.org)OP
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      21 year ago

      It works in the default Lemmy web UI. I tried it with Opera (Android) and Firefox (Manjaro). It relies on the browser’s media player.

      There’s still the link below it, for when it doesn’t work, which I expect from most Lemmy clients and probably Kbin too.

      • ChaoticNeutralCzech
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        11 year ago

        Oh, I didn’t check if the compatibility link is any different, I assumed it was the same.

        Of course you cannot embed an external site in a comment but the raw file does seem to work, in browsers at least.