To add to my last comment, you can see here that when attempting to decode as 4800 baud, the lower graph shows the beginnings of some symbol separation but not the nice clean parallel lines that allows the software to output valid 1’s & 0’s. A little more SNR (either more signal or less noise) would clean that up.
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Scott, thanks for clarifying.
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Dear Scott,
Thank you very much for your detailed investigation of the frequencies and your insights regarding the modulation scheme.
Based on the information you provided, I proposed adding “62k5 LoRa” to the list of transmitters for KOSEN-2R, and it has been approved by Fredy.
This now makes it possible to schedule observations on SatNOGS network as well.
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You’re very welcome, but please note that I am only guessing. Hopefully either through my own monitoring or now via a SatNogs station, we might see the signal sooner than later. THEN we will know what their modulation scheme is. Good luck!
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Nothing seen from KOSEN-2R around 465.36 on the highest pass (only 45°) here tonight. But, there are 100 reasons for NOT seeing a signal, so I’ll just keep checking.
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Regarding the KOSEN-2R downlink at 465.36 MHz, I attempted reception during the pass over Japan starting at 07:26 UTC on April 24; however, no valid signal was detected here either.
I will continue monitoring.
SatNOGS Network - Observation 13892970
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I tried to observe, but unfortunately this band is used for commercial mobile communication-services (ArgoNET) here in OE, so permanent high-gain digital signal on this frequency.
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With Japanese visitors, we observed two satellites from this launch with the Dwingeloo telescope: 13975731 is an observation of FSI-SAT2. This observation has various good CW-decodes. 13975720 is a good observation of ARICA-2. Both TLEs are decent but not perfect - maybe expected from a very recent deployment.
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Thanks for bringing this up, it looks like there isn’t a new TLE for this launch satellites from space-track for some days now. I’ll take a look tomorrow to update their TLE.
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Dear bali,
It has been a while.
Regarding KOSEN-2R, I received a request—via a faculty member—from the Yonago National College of Technology operations team to assist with reception. I attempted to receive the downlink in the 465.36 MHz band using the ground station at Kyushu Institute of Technology; however, no valid signal has been detected so far.
(The same result has been obtained at my personal SatNOGS ground station as well.)
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thank you @nishikazu0417 for your update.
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Celestrak updated TLE sets, as of 2026-05-05 10:15:32 UTC
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Took a guess at what the KOSEN-2R LoRa parameters might be (just used most common settings) but nothing seen on either of 2 medium-elevation passes today. Will keep trying - especially on higher passes!
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I’ve built a decoder and dashboard for ARICA-2 to show the telemetry of its CW beacons.
Please upload beacons to populate the dashboard.
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During the pass of OrigamiSat-2 over Japan at 2025-05-07 07:41 UTC,
I received the AFSK 1k2 telemetry downlink and successfully decoded 11 packets.
SatNOGS Network - Observation 13999714
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Great job!
Some of those frames certainly look like parts of a JPG image file. Of course not enough for a complete or valid picture, but that didn’t stop me from telling ChatGPT to use the ‘FF’ jpg markers to assemble as much of what the image “might” be as possible. So, this result could be completely off - or, there’s a chance that it might hint at the thumbnail image being transmitted. Odds are low, but it’s always fun to try.
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Thanks for the information!
Using the data I received from observation #14009413, I managed to reconstruct the camera image. It was amazing to see the thumbnail like this.
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Dear @K4KDR,
Thank you very much for extracting such interesting image from my observation! That is truly fascinating!
Also, @JH4XSY, I am amazed at how much clearer the image obtained from your observations is compared to the one from my own observations. The thumbnail is exceptionally clear and very impressive!
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During the pass of ARICA-2 over Japan at 2026-05-11 07:15 UTC,
My SatNOGS GS received the GMSK4k8 telemetry downlink and successfully decoded 5 packets.
However, it doesn’t appear to be AX.25.
SatNOGS Network - Observation 14029089
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