what is the difference between shortwave and longwave radio
Shortwave radio Shortwave communications began to grow rapidly in the 1920s,[10] similar to the internet in the late 20th century. By 1928, more than half of long distance communications had moved from transoceanic cables and longwave wireless services to shortwave and the overall volume of transoceanic shortwave communications had vastly increased. Shortwave stations had cost and efficiency advantages over massive longwave wireless installations,[11] however some commercial longwave communications stations remained in use until the 1960s. Long distance radio circuits also reduced the load on the existing transoceanic telegraph cables and hence the need for new cables, although the cables maintained their advantages of high security and a much more reliable and better quality signal than shortwave.
Guglielmo Marconi Guglielmo Marconi, 1st Marquis of Marconi (/mɑːrˈkoʊni/;[1] Italian: [ɡuʎˈʎɛlmo marˈkoːni]; 25 April 1874 – 20 July 1937) was an Italian[2][3][4][5] inventor and electrical engineer known for his pioneering work on long-distance radio transmission[6] and for his development of Marconi's law and a radio telegraph system. He is usually credited as the inventor of radio,[7] and he shared the 1909 Nobel Prize in Physics with Karl Ferdinand Braun "in recognition of their contributions to the development of wireless telegraphy".[8][9][10]