Originally, on 26 January 1989, with the beginning of the FEST film festival, a temporary nine-day television channel was broadcast.
During the duration of the JU Video Show from 5 to 11 February 1989, another temporary channel was broadcast in the Dom omladine, the editor of this program was Radoslav Zelenović.
With the signing of the contract on May 23, 1989, between the Working Organization of TV Belgrade, on the one hand, and Dom omladine and the City Conference of the Association of Socialist Youth of Belgrade, on the other hand, an agreement was reached on joint realization, broadcasting of programs on the third experimental channel, produced by Dom omladine.
It was conceived as an alternative, unconventional channel that stirred the public with its provocative content, primarily contact shows about politics and erotica.
Journalist Milorad Vučelić in the show Strictly Confidential conducted conversations with guests who had different views on the events of the fifties and sixties than the official ones, and Nebojša Glišić, while showing inserts from soft and hard porn films, brought provocative guests and spontaneous, cheeky and often spoke profanely to viewers about erotica".
News on 3K was broadcast sporadically - during the biggest crises, but they, as well as the related Weather Forecast, had the character of the Third Channel - with young presenters, "different" primetime and with minimal minutes; the biggest "ally" of 3K was MTV, which was constantly present on small screens - this is something that Channel Three, which was then known for songs from the eighties, is remembered by many young viewers at the time.
By broadcasting the show ZAM, the Third Channel played a large part in the popularization of turbo-folk music in the early nineties of the 20th century.