In broadcasting, sister stations or sister channels (or "sibling stations" in gender-neutral form) are radio and/or television stations operated by the same ownership.
Radio sister stations will often have different formats, and often one station is on the AM band while another is on the FM band. Conversely, several types of sister-station relationships exist in television. Stations in the same city will usually be affiliated with different television networks (often one with a major network and the other with a secondary network), and may occasionally shift television programs between each other when local events require one station to interrupt its network feed.
Sister stations in separate (but often nearby) cities owned by the same company may or may not share a network affiliation. For example, WNYW and WWOR-TV, in New York City and Secaucus, New Jersey, are both owned by News Corporation. WNYW is a Fox affiliate; WWOR-TV is a My Network TV affiliate. In addition, stations in different cities affiliated with the same network, but not sharing an ownership tie, may refer to each other informally as sister stations.
Sister networks, in many cases, are cable or satellite channels which are launched to either broadcast series which either premiered on the main network but has been moved out of the higher-priority schedule (i.e. TV Land), fulfill a specific niche of content which would not be fulfilled on the main network (i.e. Nick Jr., Nicktoons) or broadcast to a wider audience than the main network (i.e. CNN International, Al Jazeera English). The establishment and proliferation of sister networks on cable, satellite and Internet providers has become easier and more commercially profitable over the history of such media venues.
... first launched in 1963 as CJQM-FM, which simulcast CJQM-AM, an easy listening station owned by Winnipeg Broadcast Associates Ltd ... Associates, the original owner of Vancouver stations CHQM and CHQM-FM). 25 years that it would no longer exist and that a new station would be created within a seven day time span based on comments provided by listeners ...
... The Monsters' flagship radio stations are WKNR AM 850 (which has been on board since the beginning of the franchise) and WHKW AM 1220 ... the games will be also be heard on Youngstown sister station WHKZ AM 1440 (which simulcasts the bulk of WHKW's schedule) ... Each station will air 38 games ...
... In January, 1975, the station first came on the air as WFIA-FM ... It was a sister station to WFIA-AM ... changing call letters and formats (usually failed attempts to challenge other more dominant stations in the market), with the station typically changing formats every two to four years between 1990 and 2008 ...
... Spin South West's format is taken from Dublin's Spin 1038, the original Spin station started in 2002, also owned by Denis O'Brien's Communicorp Group Limited ... The South West station has recently also been simulcasting programmes from its Dublin sister station ... The stations make use of split links to regionalise the show, however generic jingles referring to the station as SPIN are used ...
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“Lord, do you not care that my sister has left me to do all the work by myself? Tell her then to help me.”
—Bible: New Testament, Luke 10:40.
Martha to Jesus.