Introduction to the principle of a walkie-talkie

The wireless walkie-talkie, that is, the radio walkie-talkie, refers to the radio communication equipment with the working frequency band in VHF30~300MHZ and UHF300~3000MHZ. The national standard name is ultrashort wave FM radiotelephone. Wireless walkie-talkies have been used since the 1930s. At that time, people's handheld wireless walkie-talkies with small power and small size were called "interphones", and large power and large size could be installed in cars (ships), etc. Vehicles or fixed-purpose wireless walkie-talkies are called "radio stations", such as marine platforms, radio stations, base stations, fixed stations, and transit stations. Two wireless walkie-talkie classification

 

Wireless walkie-talkies can be divided into simplex machines and duplex machines according to different communication working modes. They can be divided into analog walkie-talkies and digital walkie-talkies according to different technologies. They can be divided into vehicle-mounted, handheld, and forward-based according to different ways of use. , fixed type, etc.

 

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Telecommunications Knowledge