Editing Kalundborg Transmitter (section)

== History ==
The transmitter site was inaugurated on 27 August 1927 and started broadcasting [[DR P1|the first channel of Danish radio]] on 243&nbsp;kHz longwave (LW) with 300&nbsp;[[kilowatts|kW]]. On 1 October 1951, mediumwave (MW) broadcasts of [[DR P2]] commenced on 1062&nbsp;kHz (282&nbsp;m wavelength) with 250&nbsp;kW. These two transmitters had a common reserve transmitter.

On 15 February 2007 at 00:05, LW transmissions from Kalundborg were suspended after 80 years of service. They resumed in [[Digital Radio Mondiale]] (DRM) mode at reduced power (200&nbsp;W) on 3 October 2008 after substantial modifications to the aerial earlier that year. 
During 16-31 October 2009, the old MW and LW reserve transmitter served in place of the regular MW and LW DRM transmitters.
Until mid-June 2011, broadcasts on 1062&nbsp;kHz at 250&nbsp;kW continued on a restricted time schedule. After that, the MW transmitter was taken out of service.

A new 50&nbsp;kW LW transmitter replaced the MW service. During 6-12 September 2012, the transmitter also broadcast [[BBC]] programmes with 10&nbsp;kW of power in DRM mode outside [[Danmarks Radio|DR's]] broadcast blocks in connection with the international broadcasting exhibition [[IBC 2012]] in [[Amsterdam]].<ref>{{Cite web|url=https://www.drm.org/drm-kalundborg-transmission/|title=Digital Radio Mondiale &#124; DRM Kalundborg transmission|accessdate=13 December 2023}}</ref>
[[Marine weather forecasting|Shipping Forecast]] bulletins produced by the [[Danish Meteorological Institute]] (''Danmarks Meteorologiske Institut'') ceased on 1 November 2023 ahead of full closure of the longwave service on 31 December 2023.<ref>{{Cite web|url=https://www.youtube.com/watch?v=j7SvL-h7fWM|title=Last broadcast of DR Langbølge 243 kHz (31.12.2023)|accessdate=2 January 2024}}</ref>

It was possible to receive the LW signal of the Kalundborg transmitter outdoors over a distance of 800-1,000&nbsp;km on a standard transistor radio or a longwave-compatible car radio. By connecting the receiver to a stationary or a maritime wire, frame, or active antenna, reception improved up to 1,500&nbsp;km of range.<ref>{{Cite web|url=http://www.drmradio.dk/Radiomodtagelse-da.htm|title=drmRADIO: Forbedret modtagelse|website=www.drmradio.dk|accessdate=13 December 2023}}</ref>

Every year on 4 May, Danmarks Radio rebroadcast the "message of liberation,"<ref>{{Cite web|url=https://www.kb.dk/en/inspiration/liberation/message-liberation|title=Message of Liberation|accessdate=2 January 2024}}</ref> from the Kalundborg transmitter in an hour-long memorial broadcast that began after the news at 20:00. On 4 May 1945, the Danish service of the BBC broadcast the original "message of liberation," marking the end of [[WWII]] in Denmark: "At this moment, it is announced that Montgomery has stated that the German troops in Holland, Northwest Germany, and Denmark have surrendered."