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Poldhu is a small area in south Cornwall, England, UK, situated on the Lizard Peninsula; it comprises Poldhu Point and Poldhu Cove. Poldhu means "black pool" in Cornish. Poldhu lies on the coast of Mount's Bay and is in the northern part of the parish of Mullion; the churchtown is 2 kilometres (1.2 mi) to the south-east. On the north side of Poldhu Cove is the parish of Gunwalloe and the village of Porthleven is a further 7 kilometres (4.3 mi) to the north.
Poldhu Point became the site of one of the main technological advances of the early twentieth century when, on 12 December 1901, a wireless signal was sent to St John’s, Newfoundland, by Marconi. The technology was a precursor to radio, television, satellites and the internet, with the earth station at Goonhilly Downs a nearby example.
In January 2016 Poldhu Cove was inundated with thousands of pink plastic bottles, brought onto the beach with successive tides. The National Trust said it believed a container had gone overboard from a ship, during the stormy weather.
The site is famous as the location of Poldhu Wireless Station, Guglielmo Marconi's transmitter for the first transatlantic radio message on 12 December 1901 to his temporary receiving station on Signal Hill, St. John's, Newfoundland. The station was built partly on cliff top pastures that had been enclosed in 1871 and partly on medieval fields belonging to a nearby settlement, Angrouse. The fifty acre (200,000 m²) plot was bought in 1900 and building work ran from October 1900 to January 1901, to a design by John Ambrose Fleming. During the work two Bronze Age barrows were flattened and a bronze dagger and urn were recovered.
The original twenty mast circular aerial was destroyed in a storm on 17 September 1901. For Marconi's experiments a temporary installation of two 200 foot (61 m) masts was used. The transmitter operated with a power of roughly 13 kW and a wavelength usually estimated at 170 meters. The original mast layout was not rebuilt, it was replaced with a four mast design, 215 feet (66 m) high and forming a 200-foot (61 m) square.
Marconi later used the site for his shortwave experiments, with transmissions by Charles Samuel Franklin to Marconi on the yacht Elettra in the Cape Verde Islands in 1923 and in Beirut in 1924. The groundbreaking results of these experiments took the world by surprise and quickly resulted in his development of the Beam Wireless Service for the British General Post Office. The service opened from the Bodmin Beam Station to Canada on 25 October 1926, from the Tetney Beam Station to Australia on 8 April 1927, from the Bodmin Beam Station to South Africa on 5 July 1927, to India on 6 September 1927 and shortly afterwards to Argentina, Brazil and the United States.
The station closed in 1934 and was demolished in 1937. Six acres (24,000 m²) were given to the National Trust in 1937 with the rest of the site added in 1960. The site has a stone monument pillar, erected in November 1937 by the Marconi Company, and a number of concrete foundations and earth structures also remain. In 2001 the Marconi Centre, a new museum/meeting building, was opened close to the site by the efforts of the Poldhu Amateur Radio Club, the National Trust and Marconi plc.
The substantial building near the site, originally the Poldhu Hotel, built in 1899, is currently a care home. The visitors' book shows that Marconi stayed there in May and August, 1901.
Marconi also built an earlier, smaller, experimental wireless station nearby at Housel Bay – The Lizard Wireless Station.