The microwave system is the principle of work is similar to the common communication system to receive data from another device, the conversion process. Radio signal and sends it to the Receiver General on the microwave system is configured to use a fixed-frequency (typically, about 300MHz-100GHz frequency) dependent on corporate governance the Board of communications ink kamkarok (FC: the Federal Communication Commission), which is the same as the radio station must obtain permission to use that particular frequency to avoid interference with other signals, such as to communicate with aircraft and other microwave systems, etc.Among the radio frequency that is used. Starting from 300 Kbps to 18. If mail from 30 kHz to 300 kHz shift-shift mail, called the v-coral reef (VHF), YHA 300 kHz up to 30 JI shift shift mail kHz, called u (UHF) head YHA.• VHF (Very High Frequency) system.A VHF frequency system used in broadcast television broadcasting undertaking. Close communication with 30-300 MHz frequency, such as the first systems introduced in the country in Thailand. By Channel 4 bang Khun prom. The signal sent from the transmitter signal is Analog terrestrial (Terestrial Station), several hundred kilometres away. Reception with an antenna system in General is open to the public, or so-called free-tv channel 3 (Free TV), for example, 5, 7, 9 and 11.• UHF (Ultra High Frequency) system.UHF systems are systems that are found with the ITV channels as well as communications to flight. Close communication with Analog signals in a frequency 300 MHz to District 3 GHz due to very high frequency signals are located. Preventing far transmitter must have the network station. The receiver can use a common antenna.
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