The principle of walkie-talkie communication is to use electromagnetic waves to propagate information in the air. According to Maxwell's electromagnetic field theory, a changing electric field produces a changing magnetic field, and a changing magnetic field produces a changing electric field, so that the varying electric field and the changing magnetic field are interdependent. Excited, alternately generated, and propagated in space from near and far at a certain speed, thus generating electromagnetic waves, the propagation of electromagnetic waves in the real environment, and various media in space (air, moisture, buildings, Vegetation, etc.), following the four characteristics of the wave, reflection, refraction, diffraction and attenuation of the wave
Electromagnetic wave UHF UHF wireless band, frequency is 300~3000MHz, VHF VHF radio band, frequency is 30MHz~300MHz, different frequencies have different energy and wavelength, apply wave four characteristic rules, can minimize wave The information distortion and energy attenuation propagated in space, the VHF frequency band commonly used in walkie-talkies is generally 136~174MHz, and the commonly used UHF frequency band is generally 400~470MHz, and some high-quality professional machine frequency ranges are even larger.
The frequency of the VHF band is relatively low, the displacement between the peaks is wide, and the propagation in the air reduces the energy absorption attenuation of the medium. It is suitable for open areas and offshore units. The UHF band has a higher frequency and the wave energy is stronger. It has the ability to penetrate buildings and is suitable for cities with high-rise buildings. For walkie-talkies with multi-band functions, different frequency bands can be selected in the unused environment to achieve better communication quality and longer communication distance.
An electrical appliance used to protect electrical equipment from high transient overvoltage hazards and to limit the duration of continuous flow.This term includes any external clearance necessary for the normal functioning of the appliance during operation and installation, whether or not it is a unit as a whole.
Surge protector, also known as lightning arrester, is an electronic device that provides safety protection for all kinds of electronic equipment, instruments and communication lines.When the electric circuit or communication lines or for outside disturbance suddenly produce peak current in voltage, surge protector in a very short time conduction tap, to avoid surge damage to other devices in the circuits.[1]
Surge protector, suitable for ac 50/60 hz, rated voltage 220 v to 380 v power supply system, the indirect lightning and thunder and lightning directly affect transient over voltage surge protection, or other applicable to the family home, the third industry and the surge protection industry requirements.
Surge Protector,Surge Voltage Protector,Eco-Friendly Surge Protector,Lightning Protection Surge Protector
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