The purpose of this experimental transmission was to show that the radio path was stable and the frequency error was small at low frequencies.

The first experimental transmission was broadcast in summer 1925, during "Bucharest's month".

Type 106: Fitted with an experimental transmission (assumed different from the Type 89)

The first experimental transmissions of electronic television took place in Moscow on March 9, 1937, using equipment manufactured and installed by RCA.

The experimental transmissions in 625-line format started in Moscow from November 4, 1948.

The experimental transmission proved too unreliable and was dangerously prone to overheating.

Prototype with an experimental electrical transmission.

It was also used in Baird's experimental transmissions using 30 lines in the 1920s.

Other experimental transmissions followed in other cities.

The first experimental transmissions included music programs, songs and news bulletins in addition to health, culture, and sports programs.