I credited GM with making the first radio (for a web page I'm making for you). --Rachel
original template by Ray Lam, Fall 97
revised template by Rachel Shorey and Steve Bergen 2/9/98
Welcome to the ham radio Page. This page is divided into five sections:
Back To Class VI Invention Webpages |
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WHO:Giuglielmo Marconi was the first to send and receive messages.
WHERE: England WHEN:1897 |
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The ham radio looks like a large metal box. There is a big knob right in front, and is almost the first thing that catches the eye. There are various smaller knobs used to change the slope, volume, or frequency. There is also a cord coming out of the side of the radio, with a speaker attached. Ham radios look very complicated, and people need to train to get their licenses in order to operate one. While training, it is necessary to memorize the Morse code. There might be a telegraph key by the ham radio, which is used to send Morse code to other people. The telegraph key looks like a small box with a short metal stick coming out of one side. A black knob is used to press part of the stick down onto a tiny protruding lump of metal (or contact). Every time the knob is pressed, a signal is sent. The ham radio can be about 16 inches long, and 6 inches high. Ham radios can also be made smaller. The basic way to use a ham radio isnŐt very hard, but a license is required before operating one. First you turn on the radio with the press of a button. Then a station can be chosen by turning the big knob in front. When people are heard talking, you can press the button on the microphone. After you identify yourself with a call number, you can go on with a regular conversation. One will meet a lot of people from different places because of the radio antenna that transmits messages to them. The radio antenna sends radio waves out to the ionosphere, and they bounce off it to somebody elseŐs antenna. They could be as far as Russia or as nearby as Block Island. The ham radio is exactly like a radio, except one can communicate with other people. The ham radioŐs history is very hard to trace back, because so many people invented many things to help build the ham radio. In 1876 in Scotland, Heinrich Hertz proved that electrical energy could be sent across space by electromagnetic waves. In England in 1897, an Italian named Giuglielmo Marconi sent and received Morse code messages from across the Bristol Channel. Also, during 1909 in the Netherlands, A.H. de Voogt built the first receiver. The ham radio was invented over many, many years of work. When people created their inventions, they didnŐt know that they would be used in other ways, but they were all made in order to make human communication quicker and easier. The ham radio has made communication much easier, but not very many people know about this invention, and not many people know how important it was to history. |
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