In recent years, two-way radios have become the first-choice communication device for many ordinary consumers. Whether it is self-driving tours, outdoor mountaineering, or hiking, the two-way radios have become more and more popular among ordinary users due to its features such as fast calls without relying on mobile phone networks. But for most people who are in contact with two-way radios for the first time, the first question they think of is-how far is the transmission range of the two-way radios?

Some factors affecting the working range of two way radios

1. Internal factory effecting transmission distance

1.1  Power

For radio equipment, the size of the transmission power is a very important basic parameter. The difference in power will directly affect the stability of data transmission and the transmission distance of the signal. Simply put, without considering other factors, the signal distance transmitted by a high-power two-way radios is greater than that of a low-power two-way radios.

In addition, the power of the two-way radios is not as large as possible. Excessive power will not only cost more power, but will also affect the life of the internal power amplifier components of the two-way radios. It will also interfere with other radio wave communications, and even cause radiation pollution.

1.2  Internal circuit

The internal circuit mentioned here is a general term for sensitivity, voice processing circuit, and anti-interference circuit. To give a very simple example, when two two-way radios with the same power receive a weaker signal, the two-way radios with stronger processing and amplification capabilities will receive a clearer voice.

1.3  Frequency band

The common radio frequency band consists of UHF and VHF. UHF is the abbreviation of Ultra High Frequency, which refers to UHF radio waves. UHF refers to the frequency of 300~3000MHz. VHF is the abbreviation of Very High Frequency, that is, very high frequency, which refers to radio waves with a frequency from 30Mhz to 300MHz. In two-way radios, the UHF frequency range is usually between 400-470MHz, and VHF is between 136-174MHz. The frequency range of some professional machines is even larger.

1.4  Support dual-band radio

Simply put, the biggest difference between the two frequency bands is that the UHF band is characterized by poor diffraction and strong ability to penetrate buildings, and is suitable for cities with high-rise buildings. VHF is characterized by good diffraction and weak ability to penetrate buildings. It is suitable for open fields and offshore operations. To put it simply, the wavelength characteristics of the two bands are complementary. UHF is suitable for cities, and VHF is suitable for open areas.

Therefore, for the same two-way radios, which band is selected when using it will also affect the transmission distance. Only by choosing the right band under the right environment can the distance be longer.

2. External factors are equally important

After we have a certain understanding of some of the main internal factors that affect the distance of the two-way radios, let us look at those external factors that also affect the signal distance. These factors mainly come from the environmental factors when we use the two-way radios, including height, obstacles, electromagnetic interference and so on.

2.1: Height

When using two-way radios at different heights in the same place, the signal transmission distance is different. Using the characteristics of radio propagation, the higher the place, the longer the signal transmission distance.

2.2: Obstacles

The same as the height influence factor, when you use the two-way radios, the surrounding obstacles will directly affect the signal transmission distance. Tall buildings, trees, large vehicles, and even outdoor billboards will absorb and block the radio waves emitted by the two-way radios.

2.3: Environmental interference

The interference referred to here includes signal interference to the two-way radios caused by interference sources from other two-way radios, wireless devices, and electrical equipment, which affects the signal transmission distance.

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