[4] The program began at 8:30 p.m. with the sounds of the Croatian anthem - Lijepa naša domovino, played by Krsto Odak on the piano, followed by an announcement read by speaker Božena Begović and a speech by director Dr. Ivo Stern.

On the basis of this cooperation, Radio Zagreb was admitted in 1928 to full membership of the International Broadcasting Union, representing the Kingdom of Serbs, Croats and Slovenes.

The period from the late 1920s to the mid-1930s was marked by a decline in the purchase of radio receivers and a stalemate of programmatic and technical progress, caused by the global economic crisis.

The lag behind its progress was somewhat offset in the era of Banovina of Croatia when it was relocated to more suitable premises in 116 Vlaška Street and when modern technical equipment was purchased and transmitter power increased (from 0.7 to 4.5 kW).

Due to the low power of transmitters and geographical obstacles (Učka, Velebit, Dinara, Biokovo mountains), the range of broadcast was still limited to Northwestern Croatia.

It has been broadcasting around the clock since May 15, 1989, when the Third channel received its own radio frequency, and Vojo Šiljak and his associates started editing evening program Na Drugom super.

In 2013, it became a national radio network with entertainment and sports content, speech broadcasts that accompany daily events, culture, art, and science, as well as own production with a focus on social life.

Program concept follows people's daily rhythm: in the morning, HR 2 broadcasts announcements of daily events, with priority is given to national topics, service information on weather and traffic (regular and extraordinary reports of the Croatian Auto Club on road conditions are broadcast throughout the day), announcements on the functioning of public services, presentation of minority topics (gender, ethnic and other minority groups) and the work of NGOs etc.

[7][8] The Third channel of Croatian Radio (HR 3) was founded by editor Hrvoje Lisinski and members of the first editorial board Duško Car, Nedjeljko Kujundžić and Branko Polić in 1964.

Its basis is a talk and music program of more serious content from social, scientific and cultural fields, with analytical and in-depth work on the elaboration of particular topics and expressed critical discourse.