Industrial wireless router is based on the 5G/4G/3G wireless networks provided by operators, use IoT cards to transmit data collected by front end to back end through the wireless network, realizing the function of high-speed transmission and remote management of data collected by outdoor equipment, it is a commonly used data transmission device in the field of IoT. Under normal circumstances, the effective distance of a 4g lte industrial router is about one hundred to two hundred meters, the premise is that effective transmission at this distance can be guaranteed without the influence of other factors. This has also caused many users to have such problems that I was told it can do one to two hundred meters, but the result is that it can only transmit tens of meters, please refer to the following content for the specific reasons.

1.Transmit power: Transmit power is the fundamental factor that affects the reasonable transmission distance of 4g lte industrial routers, the greater the output power the wider the transmission range. However, according to relevant national regulations, the maximum transmission power cannot exceed 100MW which is 20dBm (2.3GHz frequency band), because the greater the output power the greater radiation source which is harmful to body health.

2.Landforms and obstacles: The actual application environment of 4g lte industrial router is complex and changeable, it is difficult to show wireless signal range value in test environment, this is mainly due to the influence of the environment and obstacles, which interfere with wireless network, among them obstacles with glass and metal walls have the greatest impact on the signal of 4g lte industrial routers.

3.High gain antenna improve smooth reception distance: High gain antenna can increase stable reception distance. The gain value is to increase power ratio of the signal generated by actual antenna, and ideal radiation source module in the same place in the space under the condition of a certain transmission power, and enhance the transmission range.

4.Weather: 4g lte industrial routers are different from ordinary sim card wifi router 4g for home use, they are mostly used in outdoor environment, which determines that they are greatly affected by temperature. For example, when humidity increases in stormy weather, the transmission range of 4g lte industrial router will become smaller and closer, harsh outdoor environment also places high demands on oxidation resistance and high protection of router chips.

In summary, when users choose 4g lte industrial routers, they should choose products with appropriate power and gain antennas according to their own needs, and try to use them in open areas to maximize the transmission distance of the router.