Linux Kernel Drops AX.25 and Amateur Radio Subsystem Support

Linus Torvalds merged a pull request to remove AX.25 and hamradio subsystem support from the Linux kernel. While the headline sounds ominous, most modern AX.25 implementations occur in software at the user level without relying on the kernel-level implementation. Direwolf, for example, does not require kernel-level AX.25 support. Other software relying on AX.25 may take advantage of dedicated AX.25 Python libraries.

The change comes as a result of AI-based bug detection services capable of identifying critical issues in code that may no longer be maintained or utilised by end users. Torvalds stated that the amateur radio-related code in the Linux kernel no longer had any active maintainers:

Amateur radio did have occasional users, but most users switched to user space implementations since it's all super slow stuff. Nobody stepped up to maintain the kernel code.

The last Linux kernel commit related to AX.25 was 6 years ago.

Additional code removed includes ISDN support, bus mouse support, and various network drivers, including support for old 3Com devices.

Rocket Lab Launches Eight JAXA Satellites on Kakushin Rising Mission

Rocket Lab successfully launched eight satellites for Japan late Wednesday night as part of its Kakushin Rising mission, supporting the Japan Aerospace Exploration Agency’s Innovative Satellite Technology Demonstration Program. Liftoff occurred at 11:09 PM EDT Wednesday, 22nd April 2026 (0309 UTC Thursday, 23rd April 2026) from Rocket Lab’s Launch Complex 1 in New Zealand. The mission carried a diverse set of small satellites designed to test new technologies and expand capabilities in low Earth orbit. The launch continues Rocket Lab’s steady cadence of dedicated smallsat missions.

The Electron rocket deployed all eight spacecraft into low Earth orbit at an altitude of approximately 336 miles (540 kilometres). Deployment occurred less than one hour after liftoff, in line with mission expectations. Rocket Lab confirmed the successful separation of all payloads shortly after the event. The mission marked the 79th launch of the Electron launch vehicle.

Kakushin Rising represents the second of two contracted launches for JAXA’s technology demonstration program. The first mission, RAISE and Shine, launched in December 2025 and carried the RAISE-4 satellite to orbit. Together, the missions highlight Japan’s continued investment in rapid, cost-effective access to space for experimental payloads. These efforts support the development of new satellite technologies and operational concepts.

The eight satellites on this mission include MAGNARO-II, KOSEN-2R, WASEDA-SAT-ZERO-II, FSI-SAT2, OrigamiSat-2, ARICA-2, Mono-Nikko, and PRELUDE. The payloads range from educational CubeSats to advanced technology demonstrators, including systems for remote sensing, communications, and deployable structures. One satellite features an antenna that can expand to many times its stowed size using origami-inspired techniques. These missions provide valuable on-orbit validation for emerging technologies. Several of the satellites are IARU-coordinated, including MAGNARO-II, KOSEN-2R, WASEDA-SAT-ZERO-II, and ARICA-2, with amateur radio downlinks in the VHF and UHF bands. Early reports from the SatNOGS network indicate that multiple satellites are already transmitting, with CW beacon signals received from MAGNARO-II, ARICA-2, 

WASEDA-SAT-ZERO-II, FSI-SAT2, and OrigamiSat-2 within hours of launch. These initial receptions confirm successful early operations and provide immediate opportunities for amateur radio operators to monitor and decode signals. Rocket Lab’s Electron rocket, a 59-foot-tall (18 metres) launch vehicle, is designed to provide responsive and dedicated access to space for small payloads. The company continues to support commercial, government, and research missions with frequent launches. Rocket Lab also operates a suborbital variant known as HASTE for hypersonic testing applications. The Kakushin Rising mission further demonstrates the growing role of small launch providers in enabling international space missions.

Media Article - https://www.space.com/space-exploration/launches-spacecraft/rocket-lab-launch-eight-japanese-satellites-kakushin-rising-mission

Changes to AMSAT TLE Distribution

Two Line Elements or TLEs, often referred to as Keplerian elements or keps in the amateur community, are the inputs to the SGP4 standard mathematical model of spacecraft orbits used by most amateur tracking programs.

Weekly updates are completely adequate for most amateur satellites. TLE bulletin files are updated daily in the first hour of the UTC day. New bulletin files will be posted immediately after reliable elements become available for new amateur satellites.

More information may be found at https://www.amsat.org/keplerian-elements-resources/.

Thanks to Joe Fitzgerald, KM1P, AMSAT Orbital Elements Manager for forwarding the above information.