| Satellite | Frequency | Notes |
|---|---|---|
| YOTSUBA-KUlover | 400.960 MHz | 4k8 GMSK |
| e-kagaku-1 (IWATO) | 145.840 MHz | 9k6 GMSK + CW (JL3ZPN) + 1k2 AFSK + Digitaltalker (IARU) |
| BOTAN | 145.825 MHz, 437.375 MHz | 4k8 GMSK + CW (JS1YPT) + 1k2 AFSK APRS Digipeater (IARU) |
See the JAXA post HERE
Please if anyone notices any error don’t get mad (I’m very sleepy right now 
it’s night in Brazil)
ITU showing the following for YOTSUBA-KULOVER:
400.960 MHz
max BW = 44 kHz …(normally includes doppler + BW of the modulation being used, I believe)
Saw a post that included the following info for YOTSUBA-KULOVER:
UP: 450MHz, Down: 400MHz
Uplink: 1400 bps AFSK
Downlink: 4800 bps GMSK
… while the freqs are not specific, if the downlink modulation is accurate, we’re good to go!
The URL for that doc is:
https://sael-lab.com/wp-content/uploads/2024/07/Ukaren_kitamura_20231017.pdf
Will it be possible to submit observations as soon as they are deployed?
The next days I’m going to check in more detail this launch, there are some transmitter suggestions in DB that need some care.
The satellites will be available for scheduling in Network ~1h before deployment and as usually we are going to schedule observations during LEOP.
TLE will be also published here, as we do for ISS deployments, we are going to use ISS TLE at the launch time and when we have the first successful observations, we are going to adjust the TLE for each of the satellite.
Everything in DB is ready for the deployment, it remains only to add the TLE, but for this we will wait to get the ones at deployment time.
Here is the live stream of the deployment from JAXA in youtube: https://www.youtube.com/watch?v=a3Ouzw2raME
I’ll update this thread closer to the deployment.
@K4KDR thanks for the info about the yotsuba-kulover transmitter, very useful!
Hi, I’m a member of e-kagaku-1(a.k.a. IWATO) project team.
Our satellite’s transmission info is below.
Hardware Model – 送信機型番: TXE145MFMCW-302A-RU
Operating Frequency – 周波数: 145.840 MHz
Data rate – 通信速度: 1200bps, 9600 bps
Beacon Interval – ビーコンインターバル: 30 minutes
Bandwidth – 帯域幅: 13.6 kHz, 136 kHz, 10.4 kHz, 161 kHz
Modulation Type – 変調方式: Analogue FM, AFSK on FM, GMSK, CW
Mode – モード: Narrow-FM
Protocol – プロトコル: AX.25
Encoding – 符号化: none
Spacecraft Callsign – コールサイン: JL3ZPN
Reception report form:
We would be grateful if you help receiving the signal from our satellite.
Thank you!
Thank you for the information.
If deployment is on-schedule, what time (UTC, please) do you expect downlink transmissions to start?
Thank you!
Our satellite e-kagaku-1 is designed to start transmission about 30 min after the deployment.
Since the deployment is scheduled at around 9:50(UTC), the satellite is estimated to start transmission about 10:20(UTC).
wish the best for your satellite
@forestwaterfall Are all the transmissions (FM, CW, AFSK and GMSK) active after the 30min of deployment?
By the way I’m working now on the last details and I’m going to schedule observations in the next ~1h.
using this simulator, follow the iss (zarya) , the deployment will occured near europe, and first transmission above indonesia.
Here are the TLE for the satellites, we use the ISS TLE changed to the temporary NORAD IDs that we have set in DB:
e-kagaku-1
1 98534U 98067A 25282.94740147 .00010951 00000-0 20092-3 0 9996
2 98534 51.6320 98.3019 0000966 226.7270 133.3638 15.49808863532969
YOTSUBA-KULOVER
1 98535U 98067A 25282.94740147 .00010951 00000-0 20092-3 0 9997
2 98535 51.6320 98.3019 0000966 226.7270 133.3638 15.49808863532960
BOTAN
1 98543U 98067A 25282.94740147 .00010951 00000-0 20092-3 0 9996
2 98543 51.6320 98.3019 0000966 226.7270 133.3638 15.49808863532969
The above TLE sets are good only for the first hours after deployment, hopefully if we receive any of the satellites we will generate better ones.
Satellites have been scheduled for the first 24h using the TLE sets of the previous post, the difference in the number of scheduled observations is based on the frequency, the deployment time of the satellites and the requests by satellite teams:
| Temporary NORAD ID | Satellite | Scheduled Observations |
|---|---|---|
| 98534 | e-kagaku-1 | 745 |
| 98543 | BOTAN | 598 |
| 98535 | YOTSUBA-KULOVER | 287 |
Note:
Scheduling only for the first 24h as we expect the ISS TLE used for the satellites to be soon deprecated. Updated TLE will be generated for the satellites if we receive their signals.
@fredy
Only CW is active as beacon, other transmissions are for misson (only active when we uplink commands from Japan)
botan:
Got it too! I think it was less than 30 minutes from deployment and literally overhead with 90 degrees of max elevation 
I received its CW beacon too loud and clear, although managed it halfway from TCA to LOS as I was observing YOTSUBA-KULOVER at 400.960 MHz and get no signal at all around there.
おめでとうございます!
BOTAN over KO33ru
CW and GMSK
2025-10-10 11:36:28 UTC: [89 Bytes KISS Frame (without CRC)]
from JS1YPT to JS1YMY:
1 > 42 11 FF 00 00 01 33 2D 2C 01 00 00 06 2D 06 39 06 56 05 CC
21 > 05 FC 05 F7 39 06 33 0D 2C 0D 0D 0C 58 0C E4 0C E9 41 0F 00
41 > 02 03 A3 A5 08 2E A4 02 48 BF 02 3B 00 A0 07 01 03 00 00 F7
61 > E0 00 87 4C 00 41 00 00 01 FF
Not very clear, have you decoded it?
