Kalundborg Radio is a major transmission facility for long- and mediumwave at the harbour of Kalundborg in Denmark. The site was inaugurated in 1927 and now has transmitters for 243 kHz longwave with 300 kW and 1062 kHz mediumwave with 250 kW plus a common reserve transmitter.
For the longwave transmitter an Alexanderson aerial is used, with two grounded 118 m steel lattice radiating towers connected by top capacitance wires. The northern tower is fed from the transmitter through a top coil, with the top coil of the southern slave tower being fed via the capacitance wires.
The medium wave transmitter uses an insulated guyed steel lattice mast aerial with a height of 147 metres. All mast virtually stand in the sea on the narrow Gisseløre peninsula, which allows for excellent radiation efficiency.
In 2007, analogue transmission on longwave from Kalundborg were suspended after 80 years of service. Longwave transmissions were resumed in DRM (Digital Radio Mondiale) at reduced power on 3 October 2008 after substantial modifications to the aerial earlier that year.
Analogue transmissions continued on mediumwave with a restricted time schedule until 27 June 2011, when the mediumwave transmitter was taken out of service and replaced by a new longwave transmitter. The analogue transmissions on 243 kHz long wave will continue until at least the end of 2014.
The old analogue long- and mediumwave reserve transmitter is known to have replaced the mediumwave and DRM transmitters on longwave from 16-31 October 2009, and the antenna tower for mediumwave is still standing.
- How to receive DRM from Kalundborg
- Kalundborg Transmission Towers (1927) at Structurae
- Kalundborg Transmission Mast (1951) at Structurae