Digital walkie-talkies are widely used in government agencies such as security protection, emergency rescue, and public utilities. With the development of the economy and the increasing demand for mobile communications by the people, digital walkie-talkies have gradually begun to be used in taxi dispatch, security, property management services, construction sites, Civilian occasions such as hotel restaurants. So how many kilometers can the longest distance between digital walkie-talkies be reached?
In the field of wireless communication technology, the basic concept of "spacing" is usually not mentioned. Because ultrashort wave communication is a line-of-sight transmission method, data signals are affected by buildings, hilly terrain, trees, and electromagnetic waves. In fact, the call distance and quality, so all the considerations are the quality of ultra-short wave calls.
Under ideal conditions (without any obstruction or influence), the talk distance of technical professional digital walkie-talkies will be very far, but in fact the talk distance is usually only between 0 to 10 kilometers, where there are tall and large buildings or high mountains. Under the circumstances, the call interval will still be shorter. When supported by the system software base station (relay), the talk distance of the digital walkie-talkie can reach more than ten kilometers or even dozens of kilometers.
Most of the digital walkie-talkies sold on the market, the manufacturer's nominal maximum call distance of digital walkie-talkies is 5~10 kilometers, in fact, this maximum call 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 no interference signals.
When you have sufficient relative height, you will find that your digital walkie-talkie conversation may not be as far away as estimated. Even under ideal conditions 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 obstacles. Flowers, trees, 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-storey 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, the general digital walkie-talkie only has frequencies ranging from 100 to 400 MHz. We know that the lower the frequency, the wider its 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, analog signals tend to be distorted and static noise is generated. 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.