Low Earth-orbit store-and-forward satellites in the amateur radio service

Several aspects of the most recently launched low-earth-orbit (LEO) store-and-forward satellites operating in the amateur satellite service are described. Included are a description of the satellites and their most interesting implementation details, with particular emphasis on the communications system; a description of the file server and broadcast protocol; a description of operation from the user´s viewpoint; and some statistics characterizing operations.<>