Category: TEN-KOH

TEN-KOH-2 released

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“We are pleased to announce that “Tenkoh-2” has been released from the H-SSOD of the first HTV-X.

Release date and time: March 11, 2026, around 18:35 (JST) – 09:35 UTC

The satellite will enter an initial operation phase for a certain period of time, during which time we will confirm that each satellite subsystem, including the power supply and communications systems, is operating normally. After that, we plan to begin operating the various mission equipment on board and carry out the planned demonstration experiments one by one.

We plan to transmit CW beacons and other signals from this satellite. Your reception reports will be extremely important information for understanding the status and operation of the satellite. If you are successful in receiving signals, we would appreciate your cooperation in sharing them using the reception report form at the URL below.

English: To Amateur Radio  Operators

A post from okuyama.keiichi on 奥山研究室 provided by: https://aero.cst.nihon-u.ac.jp/okuyama

 

Linear Transponder Uplink 145.895 MHz through 145.935 MHz
Linear TransponderDownlink 435.875 MHz through 435.915 MHz

CW, Digitalker, and AFSK 1.2kbps, GMSK 9.6kbps: 435.860 MHz
GMSK 4.8kbps, GMSK 9.6kbps, GMSK 19.2kbps, and 4FSK 38.4kbps: 435.895MHz
CW beacon: 5.839 GHz

 

1 66174U 25241A   26070.19118651  .00009215  00000-0  17770-3 0  9997
2 66174  51.6325  64.9326 0007932 179.9008 180.1983 15.48575655554479

Ten-Koh 2 to be deployed soon

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A Japanese amateur radio satellite, launched to the International Space Station (ISS) last October, will soon be deployed in a higher orbit.

After delivering about 12,000 pounds of supplies, scientific investigations, hardware, and other cargo to the ISS for NASA and its international partners, JAXA’s (Japan Aerospace Exploration Agency’s) uncrewed HTV-X1 cargo spacecraft departed the ISS on Friday, March 6. The spacecraft arrived at the space station on Oct. 29, 2025, after launching Oct. 25 on an H3 rocket from Japan’s Tanegashima Space Center.

The HTV-X1 spacecraft will boost itself to a 500km circular orbit where it will remain for more than three months acting as a scientific platform for JAXA’s experiments.

After attaining this higher orbit, HTV-X1 will deploy Ten-Koh 2, a 6U cubesat constructed by Nihon University carrying a variety of amateur radio experiments. These will include:

  • A linear transponder, developed by JAMSAT, that will operate two days each week (schedule to be announced). Transponder frequencies that have been coordinated with the International Amateur Radio Union (IARU) feature an uplink in the range 145.895-145.935 MHz with downlink 435.875-435.915 MHz.
  • Digitalker with pre-loaded audio to be transmitted at 435.895 MHz.
  • Transmission of pre-loaded digital images created in cooperation with students from the Faculty of Arts, also at 435.895 MHz.
  • Demonstration of microwave band communication technology at 5.8 GHz in the microwave band.
  • Tests of high-speed data transmission at 38.4 kbps in 4FSK.

Following the deorbit command, HTV-X1 will dispose of several thousand pounds of trash from the ISS during re-entry into Earth’s atmosphere, where it will burn up harmlessly. However, Ten-Koh 2 is expected to remain in orbit and active for approximately one year to 18 months.