If you want to achieve long-distance intercom calls, there are still many ways:

　　Increase transmission power: Some walkie-talkies come with high, medium and low transmission power adjustable。

　　The transmitting power of hand-held walkie-talkies can usually be 0.Choose between 5 and 5W, while the car walkie-talkie can choose between 10 and 40W。

　　If the communication quality is poor when using lower power, you can try to use higher transmit power to improve the communication quality and distance。

　　It is important to note that aimlessly increasing the transmitted power may result in reduced battery life, increased electromagnetic radiation, and possible signal interference。

　　High antenna: Increasing the height of the antenna can very effectively extend the communication range。

　　Increasing the antenna height can increase the communication distance by about 40% without increasing the transmission power。

　　For example, if a handheld walkie-talkie has a communication distance of 3 to 5 kilometers outside the city, by connecting it to an outdoor antenna located on the fifth roof, it can communicate with another outdoor use walkie-talkie 20 kilometers apart。

　　Improve the receiving sensitivity: the receiving sensitivity of the walkie-talkie has a great impact on its communication distance。

　　Walkie-talkies are usually adjusted to the best sensitivity according to technical requirements at the factory。

　　Users can indirectly improve the receiving sensitivity by replacing the antenna with a higher gain。

　　Reasonable setting of the quiet function of the walkie-talkie also helps to improve the receiving effect。

　　Choose open area communication: The maximum communication distance given by the manufacturer of the walkie-talkie is usually the result of testing in an open area without obstacles。

　　In urban environments, buildings and other structures heavily absorb and reflect radio waves, reducing communication distances。

　　Try to use the walkie-talkie in an open area or near a window to avoid the obstruction of tall buildings and trees。

　　So, how to avoid the radio signal is blocked?

　　The core methods for walkie-talkies to avoid signal shielding ‌ include using shielded wires to lead the antenna outdoors, choosing the appropriate frequency and power, avoiding using multiple walkie-talkies in close proximity, and staying away from interference sources ‌。

　　Use shielded wires to lead the antenna outdoors ‌

　　Because the signal shielding effect in the control room is good, the antenna of the walkie-talkie is led to the outside through the shielding line, and then a section is exposed as the transmitting antenna, which can effectively reduce the problem of indoor signal shielding。This method not only solves the problem of signal shielding, but also ensures the communication quality of the intercom ‌1。

　　Select the appropriate frequency and power ‌

　　Select the appropriate frequency and power according to the use environment to avoid interference caused by frequency overlap and excessive power。The use of digital walkie-talkies has a stronger ability to resist signal interference than analog walkie-talkies, because the digital signal can reduce the impact of interference through error correction coding and other technologies in the transmission process ‌23。

　　Avoid using multiple walkie-talkies in close proximity ‌

　　If multiple walkie-talkies are used in close proximity, the same or adjacent frequencies can easily cause signals to overlap and interfere with each other。Therefore, avoiding the use of multiple walkie-talkies in close proximity, or ensuring that each radio is set to a different frequency, can effectively reduce interference ‌3。

　　Keep away from interference sources ‌

　　Intercom in use should be away from electronic devices such as computers, mobile phones, etc., the electromagnetic waves of these devices will interfere with the signal of the intercom。Choosing to use walkie-talkies in open areas to avoid obstacles such as buildings can also significantly improve the quality of communication ‌