How radio telescopes work
Radio is the technology of communication and signaling using radio waves. Radio waves are extremely powerful electromagnetic waves of high frequency from about 30 kilohertz to about 500 kilohertz. A number of radio stations are transmitting in different parts of the world. With the development of technology, radio communication has become an important source of information, entertainment and communication.
Radio can be transmitted via satellite, TV, radio, Internet, mobile phones and other electrical devices or it can be generated by lightning strikes. Radio is a form of electromagnetic radiation with the properties of sound, light and magnetism. Radio is a source of communication with its strength similar to visible light. In the past, radio signals were the main means of transmission but now it has become obsolete because of the fast development of satellite, television and cell phone technology.
The radio waves have the same characteristics as all electromagnetic waves, except for the frequency, which is dependent on the base station. The radio waves have the following frequencies: long-term (low intensity) radio (LTR), medium-term (medium intensity) radio (MIG), short-term (high intensity) radio (SAT) and ultra-short-term (UHF). When these radio waves reach a destination, they will be received by the receiving station in different wavelengths and radio stations transmit their signals in these wavelengths.
In the early world war I, radio was used as a source of information, communication and was even used as a way to locate troops in the war. Early radio transmissions were simple, consisting of two-tone (or 3-tone) radio signals, which could be distinguished from the regular radio signals by a familiar, whistling, hissing, clicking noise. In World War II, radio transmissions became more sophisticated, and new kinds of equipment such as radar receivers were introduced. Radio operators were able to listen in to enemy radio transmissions, and use this information to locate their positions relative to the target. The use of radio as a weapon had just begun and was even further developed in the Korean and Vietnam Wars.
The United States government, fearing the potential for radio to be a weapon of mass destruction, passed the Radio Frequency Identification Act in 1970. This act requires all radios to have identifying radio waves that can be quickly identified. This identification system includes all types of radio transmissions, both military and civilian. Civilian radio stations, regardless of the license are required to display the identifying radio wave on their broadcasts. This law is referred to as RFID or radio frequency identification.
Today, there is an increasing interest in how radio telescopes scan the universe, looking for radio signals from other celestial bodies. Radio astronomers detect these radio wavelengths and analyze them for useful information about our galaxy, and the nature of space. This research is currently underway, and astronomers are hoping to find the beginnings of alien life. If radio astronomers are able to discover alien radio signals, it will increase our knowledge of the universe and perhaps bring us closer to finding out whether or not aliens actually exist.