In the field of wireless communications, there is no technical parameter such as "distance" because radio relies on electromagnetic waves to propagate signals. There are many factors that can affect the ability of wireless signals to propagate long distances. Among them, the internal influencing factors include the transmitting power of the device, the receiving sensitivity, and the antenna. Gain and height, external influencing factors include use environment, air interference waves, etc.
In a relatively closed environment, such as a city with many high-rise buildings, the walkie-talkie signal will be hindered and weakened, making the distance closer. In addition, the power and interference level of the walkie-talkie will also affect the communication distance.
If you add IP interconnection, you can make calls in different places when there is a network, or if you want smooth calls in an indoor building, you can use signal coverage, so you don't have to worry about the distance.
It is not that the longer the conversation distance, the better the walkie-talkie is, because the walkie-talkie with a long communication distance may be determined by its manufacturer, usage environment and usage status. If one is in the plains and the other is in the urban area, then the distance cannot be a measure of how good the walkie-talkie is. The standard is bad. When using a walkie-talkie, you should choose and buy it based on the use environment and specific needs.
1. Civilian walkie-talkies
Civilian walkie-talkies refer to walkie-talkies with a transmitting power of 0.5W and no more than 1W and a frequency range between 409MHz. Civilian walkie-talkies generally have a short communication distance (3 kilometers in open areas). Civilian walkie-talkies are compact and easy to carry, and are more suitable for personal business trips. For travel and restaurant use.
2.Commercial walkie-talkies
Commercial walkie-talkies refer to walkie-talkies with a transmitting power of 4-5W and a frequency range of 400-470MHz. The talking distance of such walkie-talkies is between 800 meters and 4 kilometers (depending on the transmitting power of the walkie-talkie and the specific environment) . Commercial walkie-talkies are lightweight and beautiful in appearance, and the price is relatively high like professional walkie-talkies. They are generally used in shopping malls, supermarkets, retail industries, factories, and manufacturing industries.
3. Amateur walkie-talkie
Amateur walkie-talkies are radio walkie-talkies designed and produced specifically for use by amateur radio enthusiasts. This type of walkie-talkie can also be called an "amateur radio." For this kind of amateur personal radio business, various countries have opened up dedicated frequency bands and allocated them to amateur radio sports enthusiasts. The frequency bands developed by our country are 144~146MHZ and 430~440MHZ, and countries around the world generally use this frequency band. Amateurs only need to buy the model they like, apply for a local radio network access license, and then they can chat with other people about anything.
4. Explosion-proof intercom
Among the many wireless walkie-talkie brands, there are not many brands with explosion-proof walkie-talkies. Currently, there are many explosion-proof walkie-talkie brands of (MOTOROLA) Motorola walkie-talkies to choose from in the domestic market. Explosion-proof walkie-talkies refer to walkie-talkies that can work in flammable and explosive environments such as: coal mines, liquefied gas filling companies, oil depots, oil fields, coal mines, mines, natural gas, chemical plants, flour processing plants, flax processing plants, coal Processing plants, fire protection
5. Police walkie-talkie
Police walkie-talkies are special equipment for the public security system. The frequency range of police walkie-talkies is 350-370MHz and 370-390MHz. No one is allowed to steal or misappropriate the frequency resources of public security system dedicated walkie-talkies in any way. Police walkie-talkies have many functions and generally have a keyboard-type appearance. When purchasing wireless walkie-talkies, we should pay attention to the fact that most of the transmitting frequency ranges of walkie-talkies are (400-420MHz, 450-470MHz) to avoid unnecessary trouble.
6. Car intercom
The working voltage of the car walkie-talkie is 12.5V. The current car voltage is divided into 12V and 24V. When the car-mounted walkie-talkie wants to work on a car with a voltage of 24V, a transformer needs to be installed between the car and the walkie-talkie. The transmitting power of the car walkie-talkie is 25-50W. The power is larger and the signal is transmitted farther. Car walkie-talkies can only be fixed in one place and are not as convenient to use as hand-held walkie-talkies. In addition to being used in fleets, vehicle-mounted intercoms can also be made fixed or used in monitoring centers for dispatching.
