2.4g干扰（2.4G interference）.doc

2.4g干扰（2.4G interference） The frequency of 2.4G 40/70M than the high frequency of 30-60 times. According to the principle of wavelength x = frequency light, 2.4G (about 0.12 meters) of the wavelength is 40/70M wavelength (about 4.27.5 meters, short wave, is one of a common wavelength shortwave radio) of 30 to 60. That is, diffraction is weak. This band belongs to the microwave band. Because of the weak diffraction ability, microwave transmission is basically line of sight transmission. Theres nothing in the middle that can block radio waves. In the middle, as long as there are things that can block radio waves, such as metal plates (aluminum box, metal plate, metal conductor is very good radio wave shielding material), signal strength will be greatly reduced. Because of the interference of radio waves, the microwave wavelength is very short. So close to the metal object if it is not blocked, may also be because the radio waves reflected back to the metal plate, interfering with the radio emission (after the superposition of some local signal enhancement, some weakening) caused by signal intensity decrease. As the larger leaves like natural biological objects or to have a microwave shielding effect (metal not so strong, but also, because the leaves are shaking, so the interference may be irregular, discontinuous). So if in the woods around the play where the aircraft (outskirts of road and hillside woods around the site, the side of the Highway Shelterbelt, general 2.4G control) is best not to let the plane flying far outside the woods (short time by Woods occlusion, itscontroller according to estimates before occlusion, route, speed and flight time (mental arithmetic) to ensure that the aircraft is not hit the tree and fly back around the woods). Because 2.4G suffers more attenuation, so the probability of getting out of control is higher (not necessarily losing control, because the transmitters function, if larger, can overcome attenuation, and will not get out of