oring these inventions, it was on 12th December, 1901 that Guglielmo Marconi transmitted the letter “S” from Podhu in Cornwall, and received at St. John’s Newfoundland. This was the memorable moment in the history as radio was invented.
Later, Sir Ambose Fleming developed the diode electron tube which can detect high frequency radio waves. Canadian scientist Fesseden, who is considered as the father of Broad casting radio, was successful in transmitting human voice and music without wires. In 1906, Lee De Forest invented the audion, the first triode electron tube to amplify radio waves. Armstrong developed frequency modulation, in 1918, which reduced interference and noise. The radio was actually born at the time of World War II as Voice of America and was used to transmit information and propaganda during the war. There were shows like the Words of War which was an anthology of war stories.
1. Cut the foil into 6×6 inch and tape onto the paper tower. Leave 1cm at the bottom. Cut another 7×7 piece of white paper and keep the 6×6 inch on the middle of it. Wrap it to the paper towel roll using the tape and ensure that we can slide it up and down with ease.
2. Take a piece of wire one string long and get 90 degree turn and tape it to the top corner of the free moving foil. Cut another piece of the wire the same way and paste it to the bottom which doesn’t move.
3. Take the toilet paper roll and place the tapes twice on the same direction. Peel back one of the tapes and place the wire by leaving one foot long and start spinning on the roll about 25 turns. Leave the other end of the wire at the same direction nearly one foot long. Paste the tape again. To make the second coil we use 90 turns and start spinning from 1/8th of the inch from the first coil.
8. Use the 2000 ohms ear piece, Take the coils end of the wire and scrape gently to remove the enamel or dissolve it in nail polish remover. Attach the ear piece wire and the coils wire with the ground ...Show more