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.
Scale length (string instruments) The scale length of an electric guitar affects both its playability and its tone. Regarding playability, a shorter scale length allows more compact fingering and favors shorter fingers and hand-span. A longer scale allows more expanded finger and favors longer fingers and hand-span. With regard to tone, a longer scale (e.g. Fender Telecasters with 25.5 inch (648 mm) scale length) favors "brightness" or cleaner overtones and more separated harmonics versus a shorter scale (e.g., Gibson Les Paul with 24.75 in (628 mm) scale length), which favors "warmth" or more muddy overtones. According to Dave Hunter's Tone Manual (2011), each scale length has its characteristic sound and tone, which is individual from other sounds in the tone chain: strings, pickups, pedals, amplifiers, speakers, and cabinets.