GRBAlpha - How to use digipeater or DNxD - 00. Prologue

I am JI1IZR/Masahiro. I have started HAM since 1975. I am especially interested in the satellite communication of HAM radio in these days.

I have been tracking on XI-IV, a Cubesat built by Tokyo University members, which was launched in 2003. It has been working in the space for 18 years.

I have also taken part in "ARTSAT" project as one of suppoters. The satellites, "INVADER" and "DESPATCH" launched in 2014, were on purpose of "art of satellite in space". It was very interesting and exciting for me that it was the first "ART OF SATELLITE".

Last year,  my HAM friend, JA6PL/Yoshitomo who is very active on Cubesats, asked me how to transmit some command data with software modems to GRBAlpha satellite, that launched in 2021 for a challenge to detect gamma-ray bursts with a Cubesat. 

I have deeply interested in this project. After a lot of trial and error, I succeeded to upload some data and to use digipeater of GRBAlpa. Additionally, after DNxD, Delayed Needronix Digipeater, started to work since April 27, 2022, OM1LD/Robo and I had a contact with earch other through this unique communitcation system.

From here, I will write some suggestion from my trial to let you know and use this interesting system .

OMlLD/Robo is CTO/CEO and Founder of "Needronix" that developed the TRX and other materials of the GRBAlpha satellite. You can see more information about this company from here: