For virtually an entire century,
we create media technology

Photo: the first transmitter in Zagreb (Markov trg, May 15, 1926)


On 15 May 1926, the first 350 W medium-wave radio station began to transmit programming for Radio Zagreb, situated on St. Mark€™s Square, in the core of Zagreb€™s Upper Town.

This historical event for Croatia came only six years after the first commercial radio transmission in the United States in 1920.

Key events in OIV€™s 90-year history


26 March
After issuing a concession to a group of members of the Zagreb Radio Club, the Government finally approves the establishment and draft by-laws of the Radio Zagreb joint stock company.

29 March
Zagreb€™s radio lovers joined forces at the constitutive session in the premises of the Zagreb Radio Club and elected Oton Kučera as their president

15 May
For the first time, the Zagreb Radio Station transmitter on St. Mark€™s Square began airing on medium-wave at a wavelength of 350 m.

14 June
The Zagreb Radio Club€™s management sends a request to the royal government in Belgrade to allow it to “immediately set up broadcasting in Zagreb.€ť






A new building for a transmitter was constructed in the village of Otok, across the Sava River next to Zagreb, and an antenna was installed. 


The transmitter from St. Mark€™s Square was moved to Otok because of its better location, better soil conductivity and a better, higher-range antenna.


7 November
The power of the transmitter at Otok was increased to 2 kW.

12 March
Immediately prior to the war, the transmitter€™s power was increased to 4.5 kW.


29 November
A medium-wave 135 kW transmitter at Deanovac became operational, thereby increasing the quality of radio reception.


15 May
The first television transmitter at the time in Yugoslavia, and in this part of Europe, is put into operation in the mountain lodge Tomislavov dom on Sljeme, overlooking Zagreb.


11 June
Transmission of new, higher quality radio programming on the FM spectrum begins, and it is soon aired in stereo.


15 May
Colour television broadcasting begins from the first 10 kW UHF transmitter.
A network of microwave links connecting transmitters with studios and broadcasting centres is also developed.


The first professional satellite receiver is installed.


Satellite transmission of analogue programming begins.


11 August
Transmission of digital satellite programming begins.


A DAB transmitter is installed at Sljeme.


16 April
Odašiljači i veze becomes an independent limited liability company and separates from Croatian Television.

Transmission of DVB-T programming begins at the end of the year.


Broadcasting of the HDTV test signal begins in terrestrial digital television (DVB-T/MPEG-4).


5 October
Analogue is discontinued and exclusively digital transmission is introduced for terrestrial television at the state level.


Odašiljači i veze d.o.o. becomes the network operator for two national DVB-T2 multiplexes, and with its partners it launches the subscription terrestrial television service Evo TV.


21 October
The OTT platform is put into operation for HRT€™s service HRTi.


The national DMR Tier or the CRONECT radio communication network is put into operation.



Odašiljači i veze rebrands to become OIV – Digital Signals and Networks.

Commercial application of OIV€™s Fire Detect AI system for early wildfire detection begins.


We develop the national infrastructure for the transition to the DVB-T2 signal for digital terrestrial television.

The MPLS network and IoT Smartino platform are put into operation.




Monograph: 95 years of radiodiffusion in Croatia