What is it to be-Amateur Radio?

   The radio is a hobby with many scientific disciplines. The participant is the person who tries to keep running a radio station, sometimes for press and informal conversations as well as competitions and national and international competitions. In addition to the "chats" and competitions, the amateur can help the Civil Defense authorities in situations of risk and public calamities, bringing communications to all corners, for example, within the Amazon or the African savannah. Some of these methods utilize the International Phonetic Code and the Code Q in its communication that is widely used by radio amateurs around the world to exchange information and messages in both short and long distances. In addition to the operators of amateur radio stations, these codes are used for various services, both civil and military, and also by professionals and companies that use radio as a factor of contact between its members.f

Contributions amateurs
In the world, amateur radio was responsible for the advancement of many technologies. Radio amateurs have developed the basis of radio since its inception, but for the techniques developed by radio amateurs on the Internet, for example, would not exist, or take much longer to develop. Other developments that occurred were due to amateur radio in the area, such as cellular phones, the radar, the system of data transmission via microwave and even the system of microwave ovens.
The cellular systems are based on the same principle of the repeater stations that are used by amateurs, this system works in two different frequencies, one for reception and another for transmission, only the stations that make this function in the range of an amateur using ferq��ncia at a time (simplex system) while those for mobile use two at the same time (system-duplex or full duplex), one for speakers and one for the listener. Obviously today the famous RBS (Radio Base Station) cellular system using a much more evolved than described, but the essence of the operation is the same.

Antenna is the device whose function is to transform electromagnetic energy guided by the transmission line electromagnetic energy radiated, we can also say that this law is also used in reverse, ie turn into electromagnetic energy radiated electromagnetic energy guided to the transmission line . Therefore, its function is essential in any communication where there is radio. The relationship between transmission power and reception is proportional to and obeys the formula of Friis

Part of the text taken from work done by Mr Adine PY2ADN