Digital walkie-talkies are widely used in the amateur, military, security protection, emergency rescue, public utilities, and other government agencies. With the development of the economy, the people’s requirements for mobile communications have increased, and digital walkie-talkies have gradually begun to be used in taxi dispatch, security, and property management, services, construction sites, hotel restaurants, and other civilian occasions.
In the field of wireless communication technology, the basic concept of "distance" is usually not mentioned. Because ultrashort wave communication is a line-of-sight transmission method, data signals are affected by buildings, hilly terrain, and trees, and electromagnetic waves are blocked and affected, which affect the facts. The distance and quality between the calls, so all the considerations are the quality of ultra-short wave calls.
Under ideal conditions (without any obstruction and influence), the talk distance of technical professional digital walkie-talkies will be very long, but in fact, the talk distance is usually only between 0-10 kilometers, in the case of tall and large buildings or high mountains. Under the circumstances, the call distance will still be shorter. When supported by the system software base station (relay), the talking distance of the digital walkie-talkie can reach more than ten kilometers or even dozens of kilometers.
For most of the digital walkie-talkies sold in the market, the manufacturer's nominal maximum talking distance of the digital walkie-talkie is 5~10 kilometers, in fact, the maximum talking distance is only a basic theoretical calculation data information, that is, the digital walkie-talkie does not have any The highest call distance under obstructions and without any interference signals.
When you have sufficient relative height, you will find that your digital walkie-talkie call may not be as far away as estimated. Even in the idealized condition without obstructions, the output power of the data signal will drop to a quarter, which is a 6dB loss, for every doubling of the distance.
This is because the earth is not an idealized physical model, and the data signal of the digital walkie-talkie must resist obstructions. Flowers, trees, houses, buildings and countless other objects blocked the wireless communication data signal of the walkie-talkie. In the undulating topography, low-lying terrain and topography will definitely drop your wireless communication data signal. Multi-story buildings in the natural environment of big cities are like the walls of the Grand Canyon, which will severely weaken the data signal, and the metal fence will also reduce the strength of the data signal. Of course, even a leaf will block your data signal, only a small part.
In comparison, a general digital walkie-talkie only has frequencies ranging from 100 to 400 MHz. We know that the lower the frequency, the wider the transmission area. The data signal frequency of these digital walkie-talkies is very different from that of the mobile phone.
The digital error correction technology of the digital walkie-talkie can transmit accurate voice and data in a larger range without any loss. Noise is caused by factors such as anti-static. By reducing the signal strength, the analog signal tends to be distorted, and static noise is generated at the same time. Digital walkie-talkies get rid of what they think are wrong, which helps users get better reception in noisy environments. The inherent communication security of digital walkie-talkies can prevent eavesdropping by scanning devices. Color code + ID, the probability of illegal interception is almost zero.