The radio wave table receives the radio wave, just like the mobile phone receives the base station signal, there are now a total of 6 radio signals in the world, located in Shangqiu, China, Fukushima, Japan, Kyushu, Colorado, the United States, Antor, Germany, Frankfurt 6 places, because the signal transmission frequency is not the same (60kHz-77.5kHz between), Therefore, it is necessary to pay attention to which region of the radio wave supported by the purchased radio wave table, the general radio wave can only support the United States, Japan (Japan two bureau) 3 bureau radio waves, a senior point is the United States, Japan, Britain, Germany 5 bureau radio waves, the top is 6 bureau radio waves all support.