| Yamagata Television System, Inc. | |
| Trading Name: | YTS |
| Native Name: | 株式会社山形テレビ |
| Romanized Name: | Kabushikigaisha Yamagataterebi |
| Type: | Kabushiki gaisha |
| Industry: | Television broadcasting |
| Hq Location: | 5-4-1 Shironishima-chi |
| Hq Location City: | Yamagata City, Yamagata Prefecture |
| Hq Location Country: | Japan |
| Footnotes: | Data from its Corporate Profile |
| Owner: | TV Asahi Holdings Corporation (23.5%) The Asahi Shimbun (18.6%) |
| Callsign: | JOYI-DTV |
| City: | Yamagata |
| Location: | Yamagata Prefecture, Japan |
| Branding: | YTS |
| Digital: | 18 (UHF) |
| Virtual: | 5 |
| Affiliations: | All-Nippon News Network (since April 1, 1975) |
| Owner: | Yamagata Television System, Inc. |
| Former Callsigns: | JOYI-TV (1970–2011) |
| Callsign Meaning: | Yamagata TelevIsion |
| Former Channel Numbers: | 38 (analog UHF, 1970–2011) |
| Former Affiliations: | FNN/FNS (April 1, 1970 – March 31, 1993) JNN (April 1, 1970 – September 30, 1989) |
| Licensing Authority: | MIC |
, also known as YTS, is a Japanese broadcast network affiliated with the All-Nippon News Network. Their headquarters are located in Yamagata Prefecture.
JOYI-TV (also known as YTS) signed on as the primary FNN/FNS affiliate for Yamagata Prefecture on 1 April 1970, and remained with that network for its first 23 years in operation. It shared JNN programs with JOEF-TV (YBC) until October 1989, when JOWI-TV (TUY) began broadcasting as the prefecture's JNN affiliate.[1]
In September 1992, YTS announced that it would affiliate with the All-Nippon News Network (ANN) and carry programming from TV Asahi once its affiliation contract with FNN expired on 31 March of the following year. Prior to the affiliation switch (which occurred on 1 April 1993), YBC, YTS, and TUY all carried programs from ANN as secondary affiliations. Conversely, this left Yamagata Prefecture without a full FNN affiliate for four years until JOCY-TV signed on as the new FNN affiliate on 1 April 1997. In the interim, JOOX-TV (from Sendai, which served eastern portions of Yamagata) served as the network's default over-the-air affiliate and that station, JOBI-TV from (Akita), and JOPX-TV (from Fukushima) were carried by regional cable television providers.
YTS began broadcasting in digital on 1 June 2006. The station's broadcasting area was affected by the 11 March 2011 earthquake, but received minimal damage compared to the devastation seen in the eastern areas of Tōhoku. Due to these circumstances, YTS officially terminated its analog television service as originally scheduled on 24 July 2011.