1.Amplitude modulation (AM) refers to the system of mixed wave, when mixed together, the height of the radio changed the sound waves. So called mixed the wave height (Amplitude Modulation) or AM radio AM to sound quality is not good.Easy, such as interference from neighboring stations, electrical appliances, and more importantly, disturbance from nature, including rain, lightning, lightning. Climate change will make the sound is very lack, radio, AM(Band), such as
.1.1 LW (Long wave) frequency 30 - 300 KHz
1.2 MW (Medium Wave) frequency 535 - 1605 KHz frequency of radio AM mainly used in Thailand. The 200 stations scattered all over the country, generally send far about 200 km
1.3 SW (Shot Wave) frequency 3 - 30 MHz quality sound bad, but to be far more thousands of kilometers. It can send a broadcast to across the continent, such as radio, Thailand (Radio Thailand) 11. and 965 MHz 9.0655 MHz station BBC frequency acceptable in 11.910 MHz station vertebrate or (Voice of America) frequency 11.780 MHz. The radio station of Australasia (Radio Australia) frequency 15.40 MHz Radio Japan frequency 15.235 MHz
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