IARU Amateur Satellite Frequency Coordination
 
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Ten-Koh 2 Updated: 12 Nov 2021   Responsible Operator Yushin Miyazaki
Supporting Organisation Department of Aerospace Engineering, College of Science and Technology, Nihon University  
Contact Person csys18110@g.nihon-u.ac.jp.nospam  
Headline Details: A microsat 366 x 226 x 100 mm. More info at https://okuyamalab.wordpress.com/ 1. Continuous operation (2 days/week) of the linear transponder 2. Downlink of illustration, Digi-Talker 3. Demonstration of microwave band communication technology 4. Tests of high-speed data transmission 5. Operational verification and tests of the camera payload made by Taiwan team Ten-Koh 2 will be equipped with a camera module developed by Cheng Kung University in Taiwan (=Taiwan team). The system for the camera mission was jointly developed. This camera will take pictures of the Earth. The picture data will be about 3MB per picture, so we will need the help of radio amateurs around the world to receive it, it means that they will receive parts of the picture data and we will combine these. We will make the received pictures public posting those on the web. 1. Continuous operation (2 days by week) of the linear transponder This linear transponder is for amateur radio and is developed by JAMSAT. We will be able to operate this linear transponder for longer time than ever before. 2 weeks after launch, we plan to run this operation for two days continuously every week. 2. Downlink of illustrations, Digi-Talker ➢ Illustration  Contents: Making in cooperation with students from the Faculty of Arts.  Size: about 1.3MB per 1 illustration  Downlink: Downlink the illustration data previously loaded on the satellite and publish them on the website. In this mission, the split downlink will be performed by many amateur radio stations. We will expose a tool for everyone to reconstruct the data they receive, and also set up a place to share the data. 2 weeks after launch, we plan to run this downlink for a day a week. ➢ Digi-Talker  Contents: Making in cooperation with students from the Faculty of Arts.  Size: about 0.5MB per 1 audio file (150s)  Downlink: Downlink the data previously loaded on the satellite using a Digi- talker. Play the Digi-Talker during two orbits of the earth to share it with people all over the world. We hope that this mission will bring satellite development and amateur radio closer to people around the world. 2 weeks after launch, we plan to run this downlink for a day a week.  The Digi-talker operation is suitable for outreach activities as part of STEM education for elementary and middle school students who are not familiar with amateur radio by allowing them to actually receive radio signals from nano-satellites. 3. Demonstration of microwave band communication technology We will demonstrate communication technology at 5.8 GHz in the microwave band for the first time. If it is possible to communicate on this high frequency, it may be possible to use it for amateur pilot signals. 2 weeks after launch, we plan to run this operation for a day a week. 4. Tests of high-speed data transmission This data transmission test will be carried out at 38.4 kbps in 4FSK for the first time. 2 weeks after launch, we plan to run this operation for a day a week. Proposing UHF downlinks for CW, AFSK, Digitalker, 4k8 up to 38k4 GMSK, 38k4 4FSK and Linear transponder. Also a 5.8 GHz CW beacon. The transponder uplink will be on VHF. Planning a JAXA launch in 2023 into 500km circular orbit with 51.6 degree inclination.**The following frequencies have been coordinated - Transponder downlink 435.875-435.915 MHz , experiment downlink on 435.895 MHz. CW beacon 5839.000 MHz and transponder uplink 145.895-145.935 MHz**
Application Date: 20 Sep 2021   Freq coordination completed on 10 Nov 2021

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