Grimeton Radio Station, Varberg Historical Site

Grimeton Radio Station near Varberg is a preserved early 20th-century longwave radio transmitting station in Halland County, Sweden, featuring original rotary alternator equipment. It is one of the few intact sites worldwide with its original Alexanderson alternator still available for demonstration.

On site visitors can view the large transmitter hall and the layout of the antenna field that supported transatlantic and maritime communications in the 1920s and 1930s. The station is notable for its intact mechanical and electrical equipment dating from the interwar period and for periodic ceremonial broadcasts using the historic alternator.

Construction and installation took place in the early 1920s to provide longwave services; the station remained an important link in international wireless networks until newer technologies replaced longwave rotary transmitters. The site has been conserved to preserve early radio engineering and demonstration capability.

The station sits near the coast at Varberg in southwest Sweden, roughly 90 kilometres south of Gothenburg. The flat coastal landscape and open fields accommodate the large antenna field that defines the site.

• Operational demonstrations: Occasional ceremonial transmissions are made using the original Alexanderson alternator on very low frequency longwave, attracting radio enthusiasts.
• Technical focus: Site tours explain early radio technology and the role of longwave transmission in transatlantic communication before widespread vacuum-tube transmitters.

What to See#

• Transmitter building and alternator: A transmitter hall that still houses an original early 20th-century Alexanderson alternator and associated control equipment used for very low frequency longwave transmission.
• Antenna field: An extensive antenna field composed of masts and wiring laid out to support longwave broadcasts; the field is visible across the site and is integral to the original transmission system.

Grimeton Radio Station is best reached from the nearby town of Varberg on Sweden’s west coast. Varberg sits on the E6 motorway (between Gothenburg and Malmö); from Gothenburg it is roughly a 70-80 km drive south on the E6. From Varberg town centre you will need to continue by local road to the Grimeton area (car or taxi recommended); check Varberg’s local bus network for occasional services that stop near Grimeton if you prefer public transport.

• Check the site's events calendar and plan your visit for an Alexanderson alternator demonstration day (they're the only chance to hear the original transmitter in operation) or book one of the scheduled guided tours-regular open days are seasonal so confirm hours in advance.
• Arrive soon after opening to explore the interior engine house and interpretation panels before groups arrive; the guided tour is where you'll get access beyond the exterior and technical explanations most visitors miss.
• Allow time to read the small museum displays and signage inside the visitor centre for context on early radio technology rather than only photographing the antenna field-those exhibits explain why the site is unique.