PBS Satellite Service

The PBS Satellite Service (also known as the PBS National Program Service, with the primary C-band feed being formerly known as PBS Schedule X in Eastern Time, with the West Coast delay signal designated PBS-XP) consists of feeds relayed from PBS by satellite to public television stations throughout the United States. The service launched on March 1, 1978, with wider adoption beginning in September 1978 as more satellite downlinks were installed at each PBS stations. The service provides a mixed variety of programming selected from PBS's regular network services. In the X/XP years a satellite feed was multicast by some PBS member stations on an over-the-air DTV subchannel along with their regular programming, or during overnight hours on their main channel to provide a second opportunity for viewers to watch or record primetime programming.

PBS currently utilizes one transponder on the Galaxy 16 satellite, transponder 22. This is a MCPC (multiple channel per carrier) which currently has seven channels uplinked from the PBS NOC (Network Operations Center) in Alexandria, Virginia.

Currently, select stations broadcast the feed, usually overnight, like KGTF (PBS Guam, broadcasts most of the channel as a localised feed). The primary feed, known as HD01, is also available over satellite providers like DirecTV (Channel 389), though this feed is down-converted to SD. PBS provides all of their channels free to TV providers who do not receive local member stations.

As of 2023, PBS's satellite feeds, as well as a few other PBS stations, can be received unscrambled using a free-to-air satellite receiver set to these coordinates:

PBS affiliate KETA, part of the Oklahoma Educational Television Authority (OETA), was also available on AMC-21 until June 2016. Their removal from satellite coincided with the completion of their transition to fiber distribution.

PBS transitioned to a fiber-based interconnection system known as sIX, otherwise known as the sixth generation of PBS's interconnection system, in July 2021. The original end date for linear program feeds via satellite was slated for 2016, but was later pushed to 2018, and was then pushed again to the beginning of 2021; none of these deadlines were met. PBS's main network feeds are still active as of June 2023; however, only one NPS feed remains, namely HD03. The only programs airing on this feed are news and public affairs programming; all other linear program feeds have moved to sIX; however, there may occasionally be an unannounced feed of program unrelated to news or public affairs, such as Great Performances.

Starting in 1971, PBS began distributing programs via microwave relay circuits leased from AT&T Long Lines. This was the first generation of PBS’s interconnection system. Prior to this, PBS would distribute programs to stations via "bicycling tapes," meaning that tapes would be shipped between stations through the mail. The interconnection system consisted of nearly 20,000 miles of microwave paths spread across the country. To send programming, PBS would feed these videotaped programs via the AT&T network of microwave relay circuits throughout the country. Instead of each program being received by each individual public television station, these programs were fed to "regional networks," which would then redirect these feeds to stations within their network. Examples of these regional networks included the Southern Educational Communications Association (SECA), which is now known as the National Educational Telecommunications Association (NETA); the Central Educational Network (CEN); the Eastern Educational Television Network (EEN), which is now known as American Public Television (APT); and Midwestern Educational Television (MET). This system made use of a "round-robin" method when distributing programming; this meant that, "a number of stations on the loop can originate to all other stations in the system." The system, however, had its limits. One problem was that video and audio quality would be lessened the farther away a receiving station was due to the distance the program had to travel via the interconnection system. Furthermore, areas outside the contiguous U.S., such as Hawaii, was not "economically feasible," all stations received the same feed, and there was no ability for a second or alternate program feed. In addition, according to PBS, the use of telephone lines to deliver programming was "incapable of producing high-fidelity sound," so they started to look for an alternate method of distributing programming.

PBS began to inquire about the use of satellite for program distribution dating back to 1971. PBS quickly discovered the benefits satellite distribution would have on their operations. A satellite-based interconnection system would allow improved video and audio quality. Unlike the terrestrial-based system, where quality degrades the farther the signal travels, programs fed via satellite would suffer no loss in quality; each station would receive the same copy of the program. A satellite-based system would also allow for more than one program feed.