Communication distance is a very important indicator of the wireless module, many users may find that the communication distance of the device can not reach the distance specified in the manual when they use the device. In fact, the communication distance will be affected by many factors, and it is not simply to power the device to achieve the ideal communication situation. So when the communication distance does not achieve the effect we expect, from what aspects should we improve?
Power adjustment
First of all, you should consider the problem of power supply, the operation of the wireless module will be affected by power supply noise, including various glitch voltages and high-frequency harmonics. A suitable power supply is required for decoupling to eliminate voltage glitches on the power line and ensure that the RF signal output by the antenna pins is stable and reliable.
At the same time, the wireless module is also a power-consuming device, which requires a stable power supply to ensure the working state. When choosing a power supply, it is also necessary to consider whether the power supply capacity can support the power loss of the module operation, and it is best to ensure that the power supply performance of the power supply can have more than 30% margin.
Therefore, in the planning of wireless products, the power chip with small ripple coefficient and sufficient load current should be selected as the power supply unit of the entire module so that the entire wireless system can maintain efficient and stable operation, in order to ensure sufficient transmission distance.
Transmitter and receiver tuning
Transmitters and receivers need to be adjusted for different application scenarios. For example, if you need to carry out wireless transmission for several kilometers, it is recommended to choose a wireless module with a transmission power of 30dBm, that is, more than 1W, and receive a higher sensitivity, preferably a module with an additional power amplifier (PA) and a low-noise amplifier (LNA), otherwise it is impossible to guarantee such a long-distance wireless transmission effect.
Antenna tuning
The system gain of the wireless system is equal to the sum of the transmit power and the antenna gain, so the choice of antenna gain has a very large impact on the long-distance transmission effect of the wireless system. When the antenna matches the system, the higher the antenna gain, the farther the effective transmission distance of the entire system.
The general gain of common small chuck antennas is 2.0dBi, and some outdoor antennas with stronger performance can achieve 5-8dBi. If the long-distance data transmission effect is not ideal, the antenna can be appropriately replaced, and the antenna with higher gain can be effectively expanded.
In addition to the choice of antenna, the installation of the antenna is also very important, in the installation of the erection, try to install the position of the antenna as high as possible, while adjusting the position of the antenna connected to the parallel state of the same horizontal plane, so as to ensure that the wireless signal sensing surface of the antenna can reach the maximum state, to ensure that the electromagnetic signal sent and received the maximum strength, as far as possible to enhance the transmission distance of the wireless signal.
The transmission path
Although the wireless signal has no specific shape, but itself is transmitted in a straight line in the air, if the obstacle encountered during the transmission process will have a very large impact on the transmission effect, especially the metal obstacle, not only has the effect of blocking the wireless signal, the metal also has a certain absorption and reflection effect on electromagnetic waves, which seriously affects the quality of signal transmission. Therefore, when carrying out long-distance wireless transmission, it is necessary to choose a suitable transmission path, try to avoid the impact of various obstacles on transmission, and ensure that the transmission channel is clean and smooth.
Operating frequency adjustment
After entering the information society, wireless transmission has been integrated into all aspects of our lives. Various wireless transmission devices can be found everywhere in life, but wireless devices in the same frequency band will interfere with the communication of other devices around them. Therefore, in the actual installation of the equipment, it is necessary to conduct a certain survey of the electromagnetic environment at the installation site, try to choose a cleaner channel frequency point, and avoid interfering with other equipment in the environment.
Communication distance is a more complex indicator in wireless transmission systems, which will be affected by various factors and environments. In order to achieve the ideal communication distance, it is necessary to consider as comprehensively as possible, eliminate adverse effects from all aspects, and ensure the stable operation of the wireless system.