Milestones:Yosami Radio Transmitting Station, 1929 Yosami Radio
Transmitting Station, 1929 In April 1929, the Yosami Station
established the first wireless communications between Japan and
Europe with a long wave operating at 17.442 kHz. An inductor-
type high-frequency alternator provided output power at 500 kW.
The antenna system used eight towers, each 250m high. The
facilities were used for communicating with submarines by the
Imperial Japanese Navy from 1941 to 1945 and by the United
States Navy from 1950 to 1993. Establishment of wireless
communications in Japan Before the First World War, Japan did
not have its own overseas communication networks and depended on
the wired networks operated by a foreign company. After the
First World War, the Japanese government recognized that its own
communication network was indispensable for dealing with the
increasing amount of trade and diplomatic negotiations and
decided to establish the long wave wireless transmitting
stations for communications between Japan and