Walkie TalkieIs a two-way mobile communication tool, in the absence of any network support, you can call, no charges, suitable for relatively fixed and frequent call occasions. Walkie-talkies fall into three categories: analog walkie-talkies, digital walkie-talkies and IP walkie-talkies.
The development history
Intercom is the terminal device of cluster communication. It can not only be used as the terminal device of cluster communication, but also as a professional wireless communication tool in mobile communication.
Walkie-talkies cover a wider range. Here we will work in the ultra-short wave band (VHF 30 ~ 300 MHz, UHF 300 ~ 3000 MHz) radio communication equipment are generally called radio interphone, in fact according to the relevant national standards should be called ultra-short wave FM radio telephone. People usually small power, small volume of hand-held wireless telephone is called "walkie talkie", before it was called "walkie-talkie", "walkie-talkie"; And the power, the volume of the larger can be installed in the car (ship) and other vehicles or fixed use of the wireless telephone is called "radio", such as car stage (car machine), Marine stage, fixed stage, base stage, in the turntable.
Walkie-talkie is the earliest wireless mobile communication equipment used by human beings, as early as the 1930s began to be applied. 1936 American MOTOROLA developed the first mobile radio communication product - "patrol" am radio receiver. Then, in 1940, it developed the first hand-held two-way radio am walkie-talkie weighing 2.2 kg with a communication range of 1.6 km for the U.S. Army Signal Corps. In 1962, MOTOROLA introduced the HT200, the first hand-held walkie-talkie that weighed only 935 gigabytes and was called a "brick," about the size of early mobile phones.
After nearly a century of development, the application of walkie-talkies has been very common, has moved from professional field to ordinary consumption, from military expansion to civilian. It is not only a professional wireless communication tool in mobile communication, but also a consumption tool with the characteristics of consumer products that can meet the needs of people's life. A walkie-talkie is a point-to-multipoint communication terminal that allows many people to communicate with each other at the same time, but only one person can speak at a time. Compared with other communication methods, the characteristics of this communication method are: instant communication, one call, economic and practical, low operating cost, no call cost, easy to use, but also with group call broadcast, system call, confidential call and other functions. In dealing with emergency or dispatch command, its role is other communication tools can not be replaced. Most of the traditional walkie-talkies adopt simplex analog communication mode, and some of them adopt frequency division duplex analog communication mode. Digital walkie-talkies are widely used in cluster communication, but most of them are frequency division duplex mode. Walkie-talkies and other wireless communication tools (such as mobile phones) have different market positions and are difficult to replace each other. By no means an obsolete product, the walkie-talkie is here to stay. With the development of economy and social progress, people pay more attention to their own safety, work efficiency and quality of life, the demand for radio walkie-talkies will be increasing. The widespread use of long range walkie-talkies by the public has further promoted walkie-talkies to become popular and reliable communication tools.