description AO-91 (Fox-1B) Overview
AO-91, also known as Fox-1B, is an amateur radio CubeSat launched by AMSAT in November 2017. It carries a U/V FM voice transponder for amateur radio communication and experimentation, and is part of the Fox-1 series of satellites designed to support education in radio technology. AO-91 operates in a low Earth orbit and facilitates communication between amateur radio operators worldwide.
insights Ranking position
AO-91 (Fox-1B) ranks #153 of 187 in the Satellite ranking, behind ViaSat-2, ahead of DIWATA-1.
help AO-91 (Fox-1B) FAQ
How good is AO-91 (Fox-1B)?
AO-91 (Fox-1B) scores 7.10/10 (Good) on Lunoo, making it a well-rated option in the Satellite category. Useful AMSAT CubeSat transponder, appreciated by amateur community, but shorter-lived and less historic than AO-7.
What are the best alternatives to AO-91 (Fox-1B)?
See our alternatives page for AO-91 (Fox-1B) for a ranked list with scores. Top alternatives include: SRTM, CORONA (KH-4), TanDEM-X.
How does AO-91 (Fox-1B) compare to SRTM?
See our detailed comparison of AO-91 (Fox-1B) vs SRTM with scores, features, and an AI-powered verdict.
Is AO-91 (Fox-1B) worth it in 2026?
With a score of 7.10/10, AO-91 (Fox-1B) is a solid option in Satellite. See all Satellite ranked.
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