What Are the Different Types of Handheld UHF Radio?

Radio walkie-talkie, which covers a wide range. Here we will collectively refer to radio communication equipment that works in the ultra-short wave band (VHF30 ~ 300MHZ, UHF300 ~ 3000MHZ). In fact, according to the relevant national standards, it should be called an ultra-short wave FM radiotelephone. People usually call handheld radiotelephones with small power and small volume as "interphones". Some people have previously called it "walkie-talkies", Phone ", and the large-capacity, large-volume radios that can be installed on vehicles (ships) or fixed-use radios are also called" radio stations ", such as on-board units (on-board units), ship stations, fixed stations, bases Taiwan, transit station, etc.

Radios were first used by humans

Radio walkie-talkie 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 lives. As the name implies, mobile communication is one party communicating with the other party to achieve communication on the move. It includes mobile users to mobile users, mobile users to fixed users, and of course communication between fixed users and fixed users. Radio walkie-talkies are an important branch of mobile communications.

It is a wireless terminal device that can be used for mobile point-to-multipoint communication. It can allow many people to communicate with each other at the same time, so that many people can hear the same person at the same time, but only one person can speak at the same time. . This communication method has different characteristics from other communication methods: instant communication, one-call response, economical and practical, low operating cost, no call cost, convenient use, and also has functions such as group call broadcast, system call, confidential call and so on. In handling emergency emergencies, its role in dispatching and commanding cannot be replaced by other communication tools. Radio walkie-talkies and other wireless communication tools (such as mobile phones) have different market positioning and are difficult to replace each other. A radio is by no means an outdated product. It will also be used for a long time. With the economic development and social progress, people pay more attention to the improvement of their safety, work efficiency and quality of life, and the demand for radio walkie-talkies will also increase. The extensive use of public walkie-talkies has further promoted radio walkie-talkies to become like communications tools that people love and rely on. ^[1]

Open source software radio technology has a profound impact on the radio industry, and wireless walkie-talkies are no exception. GNU Radio is a free software development tool suite. It provides signal operation and processing modules that can be used to implement software-defined radios on easy-to-manufacture, low-cost radio frequency (RF) hardware and general-purpose microprocessors. This kit is widely used by amateurs, academic institutions and commercial institutions to research and build wireless communication systems. GNU Radio applications are mainly written in the Python programming language. But its core signal processing module is C ++ built on a microprocessor with floating point arithmetic. Therefore, developers can simply and quickly build a real-time, high-capacity wireless communication system. Although its main function is not an emulator, GNU Radio supports the study of algorithms for signal processing of pre-stored and (signal generator) generated data without RF RF hardware components. ^[1]