Power is one of the important factors that affect the theoretical talking distance of walkie-talkies, so measuring the talking distance of a walkie-talkie often refers to his technology first, which is one of the reasons why many users pay attention to power first. We often see such a sentence in the instructions that "the theoretical call distance cannot be used as the practical application distance". In other words, the theoretical distance is only an ideal reference data, and it is not the actual value. Just like the walkie-talkie dealer told you tactfully, the talking distance of 3~ 10 km with a hand-held walkie-talkie is only a theory, and the actual talking distance may be 2-3 km. It is better to pay attention to the so-called reference distance of the merchant and ask what the actual talking distance is. At present, China's Radio Management Committee stipulates that the maximum power of hand-held walkie-talkies is 5W. Of course, if you want to increase the call distance, you can install a turntable tool, which is described in detail below.

2. Frequency range

First, we need to know the frequency range of the walkie-talkie. According to the regulations of China Radio Management Committee, in the daily use of walkie-talkies, the frequencies of walkie-talkies are generally divided into: professional walkie-talkies: V-band136-174 MHz; U segment 400-470 MHz；; Amateur use: 433MHZ；; Cluster usage: 800MHZ；; Armed police public security: 350MHZ；; Coastal use: 220MHZ；; Mobile phone: 900 MHz/180 MHz; Public intercom (civil intercom): 409-4 10MHZ.

Then we have to analyze it according to the classification of communication environment (topography). The terrain is basically plains, hills and mountains. In general, the communication distance and quality of plain walkie-talkies are the best. The characteristics are basically urban areas, suburbs and open spaces. There are tall and dense buildings in the urban area, and the fidgety noise will seriously affect the signal quality of low-frequency band, so the general walkie-talkie of low-frequency band signal can't penetrate the building for straight-line propagation, but can only bypass the building, which greatly affects the communication distance and quality. In this case, it is recommended that you use the E-JOY LS3800 high-band walkie-talkie. Although the number of buildings in the suburbs is obviously reduced, it is better to choose high-end frequency bands than rural and wild areas. The choice in rural areas is relatively low, because the general public walkie-talkie is still far away in the open space, so it is best to buy it according to the corresponding environmental conditions when choosing the walkie-talkie.

Step 3: Battery

First look at the nature of the battery. At present, most walkie-talkie batteries are lithium batteries or nickel-hydrogen batteries. Compared with Ni-MH battery, lithium battery is not only light in weight, but also has a longer battery life. Therefore, it is ideal to choose lithium batteries. Traditional users think that the heavier the battery, the better the quality. Look at the battery capacity again. The larger the capacity, the longer the service time of the walkie-talkie. Users can choose according to their own situation. Generally, lithium batteries can be used for 2-5 days.

Step 4 be natural

The nature of professional walkie-talkie, amateur walkie-talkie, civil walkie-talkie or explosion-proof walkie-talkie must be clarified. Professional ones are generally used in the most extensive occasions, such as security, weddings, construction sites, factories, shopping malls, public security or other temporary dispatch. Amateur strength is 4W or less, and it can be used in general. 0.5W for civilian use, and similar for entertainment and leisure. The explosion-proof walkie-talkie does not mean that it can resist explosion or explosion, but that the explosion-proof walkie-talkie will not produce sparks in use by reorganizing the circuit, and the accidents caused by sparks are fatal, such as gasoline depots, ammunition depots, coal mines and other dangerous gas environments.

5. Channel

General professional machine is 16≥ channel. If you are an amateur, you'd better buy a keyboard, because you can adjust the transmitting and receiving frequency of the channel at any time. If the professional machine needs to adjust the channel, it needs the relevant software data cable.