49501

49501 is a numerical identifier that appears in various contexts, primarily within the realm of amateur radio and emergency communications. It is most notably associated with the **Radio Amateur Satellite Corporation (AMSAT)**, a non-profit organization dedicated to fostering the development and use of amateur radio satellites. The number 49501 is linked to **AO-91**, a Phase 3E-class amateur radio satellite launched in 2018. AO-91, also known as *Radiosat*, is designed to provide global communications opportunities for amateur radio operators, supporting digital modes, voice transmissions, and experimental protocols.

The satellite operates in a low Earth orbit, enabling coverage for enthusiasts worldwide. Its call sign, **AO-91**, is derived from the AMSAT-OSCAR designation system, where "AO" stands for AMSAT-OSCAR, and the number follows a sequential naming convention. The satellite’s design includes a linear transponder and a digital transponder, accommodating both analog and digital communication formats. AO-91 also features a slow-scan television (SSTV) capability, allowing for image transmission experiments.

Beyond satellite communications, the number 49501 has appeared in other technical and organizational contexts, such as software versioning or internal documentation numbering systems. However, its most significant and widely recognized association remains with AO-91 and the broader amateur satellite community. The satellite continues to be a valuable resource for educational and recreational radio activities, promoting collaboration among operators globally. For further details, enthusiasts can refer to AMSAT’s official documentation or the satellite’s tracking resources.