Design and pre-flight performance of SPIDER 280 GHz receivers - Shaw, EC; Ade, PAR; Akers, S; Amiri, M; Austermann, JE; Beall, JA; Becker, DT; Benton, SJ; Bergman, AS; Bock, JJ; Bond, JR; Bryan, SA; et al. (SPIE, 2020)