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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APT image from NOAA-15, currently with AVHRR scanner motor malfunction, plus raw image, waterfall screenshot, audio sample and DSB images as bonus. (i.imgur.com)

submitted 1 year ago by [email protected] to c/amateursatellites

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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):

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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:

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

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)

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

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):

[–] [email protected] 2 points 1 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.