Grimeton VLF transmitter

The Grimeton VLF transmitter contains an Alexanderson alternator system with six 127-meter towers supporting extensive antenna wires for long-distance communications through radio waves.

Built between 1922 and 1924, this radio station provided Sweden's sole telecommunication connection to other countries during World War II through telegram transmission.

The station represents early 20th-century industrial engineering with its mechanical transmission system, demonstrating the evolution of global communication technology.

The facility maintains regular operational demonstrations for visitors, transmitting Morse code signals across Europe during the annual Alexanderson Day in July.

This transmitter houses the last functioning Alexanderson alternator on Earth, using rotating magnets to generate very low frequency signals at 17.2 kilohertz.

Location: Varberg Municipality

Inception: June 2, 1925

Website: http://alexander.n.se

GPS coordinates: 57.11063,12.39794

Latest update: May 27, 2025 09:53