J-ssod#37 / hokushin-1

[K4KDR]

From this post:

https://humans-in-space.jaxa.jp/en/biz-lab/news/detail/005757.html

… I see that a date has been set for this deployment: 19-June-2026.

There was another post about HOKUSHIN-1 a couple of days ago, so I spent quite a while trying to locate downlink frequency information.

The only reference that I could locate seems to indicate that S-Band (freq unknown) might be the only communications mode on this satellite:

… if anyone finds out the exact frequency, or if there are comms on any other band, please share. Thanks!

[K4KDR]

Deployment from the ISS was successful.

So, if no frequency information turns up, I’ll just do some blind scans on S-Band and see if we might get lucky.

[bali]

@K4KDR

Deployment from the ISS was successful.

pdf

congratulations! beautiful sight

Hopefully, someone from the team will join here..

73

[K4KDR]

Possible downlink on 2287.5 MHz but that’s a popular frequency, so will need some separation from the ISS to know for sure.

[fredy]

@K4KDR if I see well this is ~2MHz wide right?

By the way I was searching for some alternative names for the satellite in order to find their ITU entry, the best I found but not sure if it applies is J-CUBE which actually is the program that most of the teams deployed from Kibo participate in. Using these there are 3 entries in 2024, 2 under the name JCUBES-B and 1 JCUBES-C. The S-band on that entries is more or less around the range 2280-2290 MHz, so 2287.5 MHz sounds possible.

[K4KDR]

2 Mhz on the bandwidth of that signal, yes.

Besides the fact that that’s a common BW on S-Band, it’s listed in the only doc I could find about this satellite:

https://arxiv.org/pdf/2601.12851

[K4KDR]

Here is a notice that this sat has been ID’d & will be using # 69648.

https://x.com/planet4589/status/2069412325530972299