NPO Radio 4
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|Frequency||FM: 87.6–101.6 MHz|
CanalDigitaal: 704 (Astra 23.5°E)
Various frequencies on analogue cable
|First air date||28 December 1975|
|Former callsigns||Hilversum 4|
|Sister stations||NPO Radio 1|
NPO Radio 2
NPO Radio 5
NPO Soul & Jazz
The channel began broadcasting on 28 December 1975 under the name Hilversum 4, changed to Radio 4 on 1 December 1985. Its first programme was produced by the Veronica broadcasting association (VOO).
Initially, the channel broadcast only during the evenings, with a segment produced by Teleac, but it now operates around the clock, providing surround sound transmissions via the internet and satellite.
The emphasis during the day has once been all-complete works from both well- and lesser-known tracks, however the station focuses now more on short segments from better-known classical repertoire. In the evening (around 8-11pm) a live concert is broadcast, on Saturday evening a regular live record of an opera concert. Since 2015 live shows can be watched in the studio via a webcam.
On 19 August 2014 the station's name and logo were amended to include mention of its parent broadcasting organization, NPO.