IARU Amateur Satellite Frequency Coordination

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Sapling Magnifica Updated: 01 May 2023   Responsible Operator Flynn Dreilinger KN6HCC
Supporting Organisation Stanford Student Space Initiative (SSI)  
Contact Person flynnd@stanford.edu.nospam  
Headline Details: Sapling Magnifica is a technology demonstration mission aimed to prove several key technologies necessary for SSI?s satellites to host scientific payloads in the future. These include a magnetorquer-based ADCS, a higher quality camera than on previous Sapling missions, and reaction wheels. The satellite will be either a 1U or a 2U spacecraft, depending on proposal selection. The Sapling Magnifica is an amateur mission. This project is entirely undergraduate student initiated and developed. Additionally, most of the students involved either have HAM radio licenses or are studying for HAM radio licenses. Amateur radio enthusiasts around the world will be able to participate by sending commands to the satellite and receiving images in response, and by making range measurements with the satellite and performing their own orbit determination of the satellite. In addition, we will conduct amateur research on image downlinking?comparing three different modulation techniques FSK, LoRa, and FLRC. Amateurs will be able to receive images (and if all goes well, take an image on command). Proposing downlinks on UHF and S Band using - 500K X1 DCN: high data rate telemetry transmission - 125K X1 DCN: telemetry transmission S-Band: - 1625K X1 DCN: image transmission and two way radio ranging. - 2M F1 DNN: image transmission over FSK. - 1.2M F1 DNN: image transmission over FLRC. 70cm: All telemetry and command will be over LoRa, which is a chirp spread spectrum based scheme. The data rate will be set between 250bps and 300kbps. S-band: data downlink will be over LoRa, FSK, and FLRC. In LoRa mode, the optimal expected data rate will be 20kbps-1mbps. More info from https://github.com/stanford-ssi. Telemetry is formatted according to TinyGS requirements. https://github.com/G4lile0/tinyGS/wiki Planning a launch into a SSO 525km orbit in Q2 or Q3 2023 ** Downlinks have been coordinated on 437.400 MHz and 2427.00 MHz**
Application Date: 11 Feb 2023   Freq coordination completed on 01 May 2023

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