Kalundborg Transmitter
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The Kalundborg Transmitter is a transmission facility for long- and mediumwave near Kalundborg in Denmark. The transmitter was inaugaurated in 1927 and transmits a program in the longwave range on 243 kHz with 300 kilowatts and in the medium wave range on 1062 kHz with 250 kilowatts.
For the longwave transmission a wire aerial is used, which is supported by two 118 metre high freestanding, grounded, steel framework pylon towers. The aerial is fed at one end with the radio frequency of the transmitter, while the other end is grounded via a coil (Alexanderson aerial). This aerial type allowed the usage of less height then other types of longwave aerials, and allows the use of grounded support structures.
The medium wave transmitter uses an insulated guyed steel-framework mast aerial with a height of 147 metres. This mast is close to the sea, which allows a very good wave propagation.
15 february 2007 at 00:30 stops Kalundborg Transmitter on longwave (243 KHz) after 80 years in service.
