17Dec25 1214Z 25E FN41iq.
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^^^
Excellent quality images!
The bird will pass over me tomorrow afternoon (local time). I’ll try to record the I/Q signal, and I’ll post it (or a download link) here so that someone with a working gnuradio system can hopefully decode it!
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base on this obs
over indonesia 2025-12-18 00:38 UTC
decoder: gr-satellites
decode from .ogg file:
decode from iq raw:
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as ussual, like a pro
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Well, the pass over my location in Laos just finished. There were 2 transmissions: 1 of a couple of minutes and the 2nd of about 1 minute. I recorded both as baseband from SDR++.
Is it possible that someone with a working gnuradio system can decode these files into images?
I can’t upload them here, but I have uploaded them to my own server at:
Or I can send them by WeTransfer as an email if you provide your email address. Thanks!
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Small image snippet received by my SatNOGS #3538 station (See the observation HERE)
- 2025-12-17 ~12:04UTC
Unfortunately, my Yagi 4El couldn’t receive much (I wasn’t home at the time of the pass, so I couldn’t manually point it with another setup).
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i’m downloading both now. on progress 
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@K4KDR and @Bali - Thank-you both very much!! The secoond image was weaker, so I expected drop-outs.
Nowthat gives me an incentive to get my gnuradio system working!
Also - I will have to delete those 2 large files from my server, since it’s now exceeded the allocated disk capacity!
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Any input on how to decode the SSDV transmission “manually”?
I usually get audio files from my SatNOGS station and feed that to GNU radio with no issues. Last night I tried acquiring the transmission with the newly installed radio telescope/rotator and getting what I assume a nice signals.
From what I read from early post here, it uses USB 24k bandwidth but no matter I do it never getting any lock and decode the frames.
*ps: nfm on the screenshot is not for what I use for the audio recording
Let me know if IQ file is needed to test the decoding.
Thanks!
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Do you mean by “manually” live on pass or afterwards from a record?
If you see the signal on the waterfall, just set about 15 kHz USB like on this screenshot.
And feed the audio as described in my first post on this thread.
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