Is walkie talkie out of trend now?

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Smart electronic products such as mobile phones have entered thousands of households, communication has become more and more convenient and fast, and walkie-talkies seem to gradually withdraw from the public’s vision. However, are walkie-talkies really outdated? In fact, it is not. In many important fields, walkie-talkies with special advantages still play an important role.

Walkie talkie is a two-way mobile communication tool. It mainly consists of four parts: the transmitting part, the receiving part, the modulation signal and the modulation circuit part (that is, the human voice is converted into an audio signal through a microphone. ) and signaling processing section. When using the walkie-talkie, tune to the specified frequency band, press the button, you can send your own voice, release the button, you can answer the voice of others.

From the communication working mode, the walkie-talkie is divided into a simplex machine for simplex communication and a duplex machine for duplex communication. Simplex communication means that at the same time, information can only be transmitted in one direction. You talk and I listen, and I talk and you listen. The transmission and reception of this kind of walkie-talkie can only work alternately, not at the same time. Duplex communication means that information can be transmitted in both directions at the same time, just like making a phone call, and you can listen at the same time.

From the way of use, walkie-talkies are divided into handheld wireless, vehicle (ship, aircraft) wireless,repeater mode and so on. Among them, the repeater mode is special. It directly forwards the received signal of a certain frequency band through its own transmitter on other frequencies. These two groups of signals of different frequencies do not affect each other, thus allowing two groups of users to operate on different frequencies. For communication, it has the characteristics of sending and receiving at the same time without interfering with each other.

From the technical design, it is divided into analog walkie-talkies using analog communication technology (also known as traditional walkie-talkies) and digital walkie-talkies using digital communication technology. From the level of equipment, it is divided into amateur radio walkie-talkies and professional radio walkie-talkies. The former is designed to meet the use of radio amateurs, while the latter is mostly used in the professional business of group teams. In terms of communication business, it can be divided into public walkie-talkies, digital walkie-talkies, police walkie-talkies, marine walkie-talkies, aviation walkie-talkies, etc.

The most prominent feature of the walkie-talkie is that it uses a specific frequency band to achieve communication, which is not restricted by the network. In the place where the network cannot cover, the walkie-talkie can show its skills and allow users to communicate easily. At the same time, the walkie-talkie provides one-to-one and one-to-many communication methods, one-touch talk, simple operation, direct and clear, especially in the case of emergency dispatch and collective cooperation, these characteristics are very important. Therefore, at present, walkie-talkies are mainly used in public security, civil aviation, transportation, water conservancy, railway, manufacturing, construction and service industries. They are mostly used for liaison and command and dispatch between group members to improve communication efficiency and respond quickly to emergencies. In addition, using the walkie-talkie has no call charges, and the call cost is low.

It is worth noting that the call distance and effect of the walkie-talkie are mainly affected by the following factors:

1. The stronger the output power of the transmitter, the larger the coverage of the transmitted signal and the farther the communication distance. However, if the transmitting power is too large, it not only consumes electricity, but also affects the life of the power amplifier components, and has strong interference, which affects the call effect of others, and also produces radiation pollution.

2. The higher the receiving sensitivity of the communication machine, the longer the communication distance.

3. The gain of the antenna, when the antenna is matched with the machine, the higher the antenna height, the stronger the receiving or transmitting ability.

4. Environmental factors, mainly path, density of trees, electromagnetic interference of the environment, buildings, weather conditions and terrain differences.

With the entry of walkie-talkies into the civilian market, people have begun to use walkie-talkies more and more when traveling and shopping, and even the access control of residential units has walkie-talkies. Now, have you discovered that walkie-talkies are actually everywhere?

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