IARU Amateur Satellite Frequency Coordination

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AEPEX Updated: 15 Jan 2024   Responsible Operator Robert Marshall KF0IEF
Supporting Organisation University of Colorado Boulder  
Contact Person Robert.marshall@colorado.edu.nospam  
Headline Details: A 6U CubeSat. AEPEX will image the Earth's upper atmosphere in X-rays from low-Earth orbit, nominally 500 km altitude to ensure a reasonable field-of-view. A high inclination is required to ensure coverage of the radiation belts; a polar orbit (90-degree inclination) is preferred, so that through orbit precession, varying magnetic local times (MLT) are sampled over the duration of the mission. The LASP ground station in Boulder will be used for both UHF and S-band communications. Primary mission objectives: 1. Measure the X-ray flux emitted by the atmosphere and the precipitating electron distribution, and use these measurements to determine the precipitating flux and energy deposition 2. Image the X-ray emitting region to measure the spatial extent of precipitation events. Due to AEPEX’s nature as an education and research mission, much of the research work is done by undergraduate and graduate students. This work is invaluable to students as they learn and become well versed in space science. In working on the project, these students become knowledgeable and appreciative of the amateur radio art and go on to form the next generation of radio amateurs. AEPEX also specifically studies the space weather environment and X-ray impacts on the lower ionosphere, which plays an important role in how HF waves propagate and affect the space environment. Proposing a UHF downlink using 9k6 or 19k2 using GFSK with AX25 packets. Also proposing an S Band downlink using up to 10Mbps OQPSK with CCSDS packets. More info at https://lasp.colorado.edu/missions/aepex/ Planning a Vandenberg launch with Firefly under a NASA CSLI program into a 475 km 98 degree orbit in August 2024. **Coordination has been provided for downlinks on 437.325 MHz and on 2405.000 MHz**
Application Date: 02 Dec 2023   Freq coordination completed on 15 Jan 2024

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