be fed via HD04 starting in July 2021; all programs will move to sIX only. American Public Television began to transition their programs to sIX in March 2021. On July 3, 2021, all APT and NETA programs migrated to sIX, effectively ending their distribution via satellite. KNME's program uplinks on HD05 have also migrated to sIX, with the exception of Democracy Now!. PBS moved nearly all linear-fed non-news content to sIX in July 2021. Pledge program feeds were discontinued in August 2021. PBS decommissioned the SD05 and SD06 feeds on July 21, 2021, at 2:56 p.m ET. Channels The channels currently available via Ku-band satellite on AMC-21 at 125°W are listed below (Lyngsat). All SCPC feeds are share amongst select affiliates. Montana PBS (this transponder is independent of PBS's other feeds) HD01 (PBS East) HD02 (PBS West) HD03 (NPS Feed) HD04 (NPS Feed, SCPC) HD05 (NPS Feed, SCPC) HD06 (PBS Kids Channel) SD02 (Create (TV network)) SD04 (World (TV network)) SD08 (FNX) Discontinued Feeds: SD01 (NPS Feed) (December 9, 2008 - September 5, 2016) SD03 (V-me) (December 9, 2008 - March 2017) SD05 (NPS Feed, SCPC) (December 10, 2008 - July 21, 2021) SD06 (NPS Feed, SCPC) (December 10, 2008 - July 21, 2021) SD07 (NPS Feed, SCPC) (December 10, 2008 - November 13, 2019) Scheduling Throughout much of their history on satellite, PBS utilized four transponders corresponding to a different "Schedule," namely 'Schedule A,' 'Schedule B,' 'Schedule C,' and 'Schedule D'. Another feed, Schedule E, launched in 1988. Also starting around 1988, PBS would begin displaying an on-screen schedule on their feeds; this was in response to confusion and concerns from home dish users concerning schedule availability. PBS would later drop this practice starting around 1996. In 1995, PBS launched nine new feeds to replace the former A, B, C, D, and E feeds, namely: 5A0, 5A5, 5B0, 5B5, 5B6, 6, 7L, 7U, and 8. In 1997, PBS would rename their feeds with the prefix "50-" (Schedule 501, 502, etc.). There were five primary NPS feeds, Schedules 501–505, in addition to three SCPC feeds. Schedule 503 was reserved for PBS's Adult Learning Service, which launched on August 29, 1981, and was discontinued in September 2005. Schedule 503 was most active during academic semesters, mainly during the Fall semester (August–December) and Spring semester (January–May), though there would be occasional blockfeeds during the months of June and July. In addition to