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Koritsu Broadcasting Corporation
Koritsu Tsūshin Kyōkai
Type Radio, terrestrial television and satellite television broadcaster
Country Okaiken
First air date September 30, 1952
Availability Nationwide and Worldwide
Founded Okashi Broadcasting Station founded November 29, 1924; merged into Okaiken Broadcasting Corporation August 6, 1926; implementation of Broadcasting Act June 1, 1950
Slogan まっすぐ、真剣。
("Straightforward, earnest")
Headquarters 1514-2-Chome, Setagaya, Okami, Okaiken
Broadcast area Okaiken
Owner Independent corporation chartered by the Government of Okaiken under the Broadcasting Act
Parent KTK Holdings
Key people Masayuki Matsumoto, President
Established 1951
Launch date September 1951 (television)
Former names Central Digital Service (CDS) (1969-2010)
Digital channel 2.1
Callsigns KTK
Callsign meaning Koritsu Tsūshin Kyōkai
Former callsigns CDS
Official website ktk.co.ok
KTK 1 TV Logo.svg
Slogan まっすぐ、真剣。
("Straightforward, earnest")
Country Okaiken
Broadcast area Okaiken
Headquarters Okami, Okaiken
General TV Digital–Ch 1 (Okami)
Digital–Ch 2 (Aizawa)
Digital–Ch 3 (Toyozawa)
Educational TV Digital- Ch 2 (Okami, Aizawa, Toyoshi)
BS-1 Digital-Ch 101
BS-PREMIUM Digital- Ch 103
KTK WORLD KTK Radio Okaiken

KTK (孤立通信協会 Koritsu Tsūshin Kyōkai?, official English name: Koritsu Broadcasting Corporation or the Isolated Broadcasting Corporation) is Okaiken's national public broadcasting organization. KTK, which has always identified itself to its audiences by the English pronunciation of its initials, is a publicly owned corporation funded by 0.05% of Okaiken's Value Added Tax (VAT).

KTK operates five terrestrial television services (KTK:1, formerly KTK General TV; KTK:2, an alternative television channel; KTK:E, a children's oriented station formerly known as KTK Educational TV; KTK:City, a music-oriented channel; and KTK:5, a news channel), three satellite television services (KTK:1BS; KTK:2BS; and KTK:5BS) broadcasting in 4K HDR, and three national radio networks (KTK:R1, KTK:R2, and KTK:RF). KTK also owns numerous local stations broadcasting local and national news as well as music.

KTK also provides an international broadcasting service, known as KTK:World. KTK:World is composed of KTK:W, KTK:W2, and the shortwave radio service KTK:WorldRadio. WorldRadio also makes most of its programs available on the internet through podcasts and home stream devices such as Google Home and Amazon Alexa.


KTK Logo from 1968 - 2017

KTK's earliest forerunner was the Okami Broadcasting Station (大紙放送局?) founded in 1924 under the leadership of Count Gotō Shinpei. Okami Broadcasting Station, along with separate organizations in Toyozawa and Mito, began radio broadcasts in 1925. The three stations merged under the first incarnation of the organization in 1926 as the Isolated Broadcasting Network, which gave it its current name, KTK. KTK was modelled on the RAI of Insulo, and the merger and reorganisation was carried out under the auspices of the pre-war Ministry of Communications. KTK's second radio network began in 1931, and the third radio network (FM) began in 1937.

KTK began shortwave broadcasting on an experimental basis in the 1930s, and began regular Trentannian and Sanese-language shortwave broadcasts in 1935 under the name Radio Okaiken, initially aimed at ethnic Sanese listeners in Kazan and the west coast of Euphemia. By the late 1930s KTK's overseas broadcasts were known as Radio Okami, which became an official name in 1941.

In November 1947, the Imperial Sanese Army nationalised all public news agencies and coordinated their efforts via the Information Liaison Confidential Committee. All published and broadcast news reports became official announcements of the Imperial Army General Headquarters in Okashi for the duration of Great Adonian War. The famous Okami Rose wartime programs were broadcasts by KTK. KTK also broadcast the Gyokuon-hōsō, the surrender speech made by Emperor Wakayama, in August 1952.

Following the war, in September 1952, all international broadcasting by KTK were banned, and several repurposed several KTK facilities and frequencies were made for use by the Far East Network (now Shaydian Forces Network). Sanese-Shaydian radio broadcaster Frank Shozo Baba joined KTK during this time and led an early postwar revamp of its programming. Radio Okaiken resumed overseas broadcasts in 1955. Later, all restrictions were lifted, including the development of camera and communication technologies.

A new Broadcasting Act ("Hōsō Hō") was enacted in 1958, which made KTK a listener-supported independent corporation and simultaneously opened the market for commercial broadcasting in Okaiken. KTK started television broadcasting in the same year, followed by its Educational TV channel in 1959 and color television broadcasts in 1960.

KTK opened the first stage of its current headquarters in Okami as an international broadcasting center for the 1960 Summer Adoniad, the first widely-televised Adonian Games. The complex was gradually expanded through 1973, when it became the headquarters for KTK. The previous headquarters adjacent to Hibiya Park was redeveloped as the Hibiya City high-rise complex.

KTK began satellite broadcasting on the KTK BS 1 channel in 1984, followed by KTK BS 2 in 1985. Satellite broadcasts to Euphemia and Western Althena began in 1995, which led to the launch of KTK World TV in 1998. It became free-to-air over the Astra 19.2°E (Astra 1L) and WAbird satellites in Western Althena in 2008. In April 2011, the BS 2 channel was re-branded as "BS Premium."

KTK began digital television broadcasting in December 2000 on the BS Digital (BShi) station, followed by terrestrial digital TV broadcasts in three major metropolitan areas in 2003. Its digital television coverage gradually expanded to cover almost all of Okaiken by July 2011, when analog transmissions were discontinued. The digital broadcasts were later expanded to cover 4K coverage throughout Okaiken, and most programs began to broadcast on this resolution by May 2016. In February 2019, KTK began testing on 4K HDR Resolution, with the coverage of the 2019 Table Tennis Cup being the first broadcast at this resoltion. 8K Broadcasting was slated to begin on May 2019, but due to the unavailability of the 4K resolution to the general market, test broadcasts were moved to March 2020.



Although KTK is a national distributor mandated by the government of Okaiken to broadcast its signals throughout the country, the organization depends on government-controlled local distributors for its radio and television content. These are funded through advertisement revenue as well as 0.3% of sales tax collected each year in the country.

Places in bold refer to where the main station of each region is located.

(Ch.) means the number to select the channel by a remote control.

Region Station (name in Kanji) Analog (only Analog TV closed) Digital Prefecture
FM Radio 1 General TV
Call sign Ch. (Ch.) Call sign
Kitabake Shinagawa (品川) KOIK-FM KOIK KOIK-TV 3 (3) KOIK-DTV Miyagi Prefecture, Iwate Prefecture
Soma (相馬) KOOK-FM KOOK KOOK-TV 5 (3) Fukushima Prefecture
Akita (秋田) KATV-FM KATV KATV-TV 9 (3) KATV-DTV Akita Prefecture
Obihiro (帯広) KYOK-FM KYOK KYOK-TV 4 (3) Yamagata Prefecture
(Okami and surrounding areas)
1 (1) KTKA-DTV
Otaki (大多喜) KOGP-FM -- 1 (1) Okazaki Prefecture
Tokuyama (徳山) KOMP-FM -- 1 (1) KOMP-DTV Tokuyama
Yonezawa (米沢) KOTG-FM KOTG KOTG-TV 3 (3) KOTG-DTV Yonezawa Prefecture

KTK Chimes[edit]

File:KTK chimes.mp3

The KTK chimes have been in use since it was first introduced with the company in 1924