Hello everyone, customers usually ask how far a certain model of walkie talkie can travel. To be honest, every time I am asked this question, I feel it's difficult to explain. In the field of wireless communication, there is no technical parameter called "distance" because there are too many factors that can affect the long-distance transmission of wireless signals. The commonly used wireless walkie talkies generally use 130-170; There are two frequency bands from 403 to 470, which are also allowed by national laws for individuals or organizations to use. In general, these two wave frequencies propagate in a straight line. The sea is an ideal communication environment for wireless walkie talkies on Earth, with generally no obstacles and minimal interference. However, in reality, handheld walkie talkies at sea can only travel about 10-20 nautical miles because the Earth is circular, and if they are too far apart, they will be blocked by seawater in the middle. When used in cities, obstacles are the most significant factor affecting the signal propagation distance. The actual communication distance of professional walkie talkies with a power of 5 watts in cities is generally only within the range of 2-5 kilometers. In areas with high ground, numerous buildings, or relatively enclosed interiors, the communication distance may be shorter. However, when supported by the system base station, the communication range of the walkie talkie can reach tens of kilometers or even tens of kilometers (if both walkie talkies are at high altitude, it can also reach tens of kilometers). The 0.5W walkie talkie sold on the market has a manufacturer's nominal maximum call distance of 3 kilometers. In fact, this call distance is only a theoretical calculation data, based on transmission power, which means the maximum call distance of a 0.5W walkie talkie without obstacles or electromagnetic interference. In practical use, due to the different environments in which users are located, background noise can vary in size, and electromagnetic interference can be strong or weak. Therefore, the actual call distance is generally less than 3 kilometers. Many users often mistakenly think that when purchasing walkie talkies, they can use them in cities, and the call distance can reach 3 kilometers, which is unlikely! No manufacturer can predict the user's usage environment, and of course, it is impossible to provide actual call distance. So when answering the customer's question about distance (straight-line distance in the city), I think this answer is relatively objective: A Handheld walkie talkies: 5-watt professional phones: 1-5 kilometers; 2-watt workbench: 1-3 kilometers; 0.5 Civil aircraft: 500-1000 meters. B. Car mounted walkie talkies (usually around 25 watts): 5-15 kilometers

Another theory is that in the field of wireless communication, there is no parameter called "call distance". This term is usually due to an issue that users are more concerned about when purchasing a walkie talkie, and they naturally believe that the farther the walkie talkie is, the better. In fact, the communication distance of walkie talkies is influenced by many factors. The electromagnetic wave signals emitted by walkie talkies are obstructed and interfered with by buildings, mountains, forests, electromagnetic fields, etc. during transmission, which affects the actual communication distance and quality. Especially in cases of severe electromagnetic interference, communication distances can sometimes be very short or even impossible. Some observant old users have discovered a problem and are puzzled to ask me, why can't the call distance of today's walkie talkies keep up with the old products many years ago? The reason behind this is that the electromagnetic environment is deteriorating compared to many years ago! Previously, walkie talkies were not very popular, mobile phones were still high-end consumer goods, and electromagnetic interference was not severe. However, now we are constantly surrounded by electromagnetic waves, so this phenomenon is inevitable. To give a more easily understandable analogy, if we throw a stone on a calm water surface, the splashing water waves will slowly spread far away. If we throw several stones at the same time, you will find that the distance of water wave diffusion is no longer so far, because water waves interfere with each other and cancel each other out! Similarly, the mutual interference of electromagnetic waves can affect the communication distance of walkie talkies. Experiments have shown that in urban areas, the actual effective communication distance of walkie talkies is about 3 kilometers, while in suburban areas it is slightly further, about 4 kilometers. Of course, if there is certain network support, such as setting up a relay station, the communication distance of the walkie talkie can reach more than 5 kilometers. If multiple base stations are used, it can even reach tens or hundreds of kilometers. If someone tells you that the walkie talkie can reach over ten kilometers without network support, you can turn around and leave, but the walkie talkie cannot meet that requirement. Walkie talkies are relatively practical in certain situations, such as shopping malls, hotels, KTVs, community security, school security, forest blind spots, self driving tours, hiking, and so on Some 0.5 W walkie talkies are used for leisure play and play games for children!