How to increase the talk distance of two way radio

The talk distance of a radio is one of the standards for measuring the quality of a radio. In work, a walkie-talkie that does not have enough talk distance will seriously affect work efficiency, and will also affect our mood in life. How can we improve the talk distance of the radio,and maximize the performance of the radio, becoming our biggest problem, let's take a look at ways how to increase the talk distance of the radio:

1.Increase transmit power

Almost all radio have high, medium and low transmission power adjustable. For handhelds, the transmission power is generally selected between 0.5 ~ 5W; and the vehicle-mounted station can be selected between 10W ~ 40W. If the use of low-power communication has obvious noise and affects the communication, the higher the transmission power, the higher the communication quality and the longer the communication distance. According to research, as long as the transmission power is doubled, the radio communication distance can be expanded to about 1.4 times the original distance. However, if the transmission power is intentionally increased at will, it will also bring about negative effects such as increased power consumption, increased electromagnetic radiation and interference.

2. Improve the receiving sensitivity

The receiving sensitivity of the walkie-talkie has a great influence on the communication distance. Generally, when the hand-held radio leaves the factory, the sensitivity has been adjusted to the best condition according to the relevant technical requirements. Without professional instruments and technical personnel, the reception sensitivity of the radio must not be adjusted by itself. For users, in addition to adjusting the squelch threshold of the radio, the receiving sensitivity of the radio can be correspondingly improved by switching to a high-gain antenna. For example, for the antenna of the handset, the rod-type gain is the highest; r / 4 whip is the second, and the spring spiral is the lowest. The outdoor gain antenna of the radio has been clearly marked at the factory. Generally, the higher the gain of the antenna, the longer the physical size and the stronger the ability to receive weak signals. When changing the antenna, you should pay attention to the antenna of the same frequency band (the antennas of different frequency bands cannot be used interchangeably). Otherwise, it will not only improve the receiving sensitivity, and may even cause a large standing wave due to the antenna mismatch, which may damage RF power amplifier.

3. Try to choose an open place to talk

The theoretical communication distance given by the radio manufacturer is actually tested under the barrier-free conditions in the open area. In this communication environment, the loss of radio wave propagation is minimal, and the absorption of radio waves by reinforced concrete buildings in the city is relatively serious. A team of radios with a nominal distance of 3 kilometers for open area communication are often used in such buildings with a communication distance of only a few hundred meters. Therefore, when using the intercom brand indoors, you should try to select the * window position, and outdoor use should avoid the surrounding tall buildings or trees.

4. Try to raise the antenna

The increase in antenna height is very effective for expanding the communication distance. On the premise of not increasing the transmission power, every time the receiving and transmitting antennas are doubled, the communication distance can also be expanded to about 1.4 times the original, which is economical and environmentally friendly. Generally, in the urban area, the outdoor communication distance of the handset is 3 ~ 5 kilometers. If one of the radio is connected to the outdoor antenna on the top of the 5th floor, it can maintain communication with another outdoor radio that is 20 kilometers away. The author has experimented with a pair of handsets with an outdoor communication distance of about 4 kilometers in the urban area. One of them is carried on the top of a mountain about 100 kilometers away from the urban area, and the radio can still be connected to the intercom in the urban area. It is strongly recommended that friends who are connected in the car use the car antenna. Be aware that every 3DBi gain is equivalent to doubling the transmit power of your radio. At the same time, it avoids the signal shielding of your hand in the car and the radiation to the human body in the car. Erecting a relay station Wuhan Intercom Interchange recommends the use of rod antennas. It has high gain and high strength, making it easy to install.

5. It is very important to choose the communication environment and direction, sometimes it will make a big difference in the quality of communication

Generally we should follow the following principles:

A. Try to choose a higher terrain connection, for example, if you can connect on the second floor, do not on the first floor.

B. Try to connect outdoor as much as possible, because the reflection and attenuation of the 70 cm wave on the building wall is very strong.

C. Try to avoid the residential area surrounded by buildings. The old city has densely arranged buildings, dense trees, under high-rise buildings, roads surrounded by large cars, underpasses and bridges, and large metal billboards. .

D. Use of urban canyons: This is very important. We have tall buildings and dense buildings in large cities. It is difficult to find true line-of-sight transmission opportunities. Therefore, we must make good use of the existing environment. The so-called urban canyon refers to the trunk roads with dense buildings on both sides and tall roads with wide and small bends. Even if they are connected on the same route that they intersect (such as vertical and diagonal sections), then the effect of the connection is generally better. On the contrary, if both parties are connected in intricate paths or buildings, the effect of communication will be poor. Therefore, we suggest that if you plan to connect while driving, please start after entering a wide road.

E. Choose the right direction, and try to avoid the shielding of tall buildings and metal bodies between the points connected to you. If you place it behind your communication direction, it can also function as a signal reflector.

F. The night connection is better than the day connection.

G, fixed-point communication is better than mobile communication.

6. National remote radio solution

Of course, if you want to get a longer distance, you need the remote radio terminal of Desset's interphone, which can realize the intercom between any place in the country as long as there is a mobile phone signal.

The remote iradio terminal is a powerful voice interworking device. It can connect to traditional analog trunking and digital trunking systems. With the help of the mobile phone operator network, the wireless trunking signal can be extended and expanded. The interworking gateway can be customized in different versions and supports multiple types. The frequency band analog trunking also supports various digital trunking systems and is suitable for a variety of industry applications. The remote interconnection terminal of the radio adopts a portable design and a built-in battery, which is suitable for use in the wild environment.