How far is the transmission distance of the wireless five-party intercom in the elevator

That's because in the field of wireless communication, there is no such technical parameter as "distance", as there are simply too many factors that can affect the long-distance transmission of wireless signals. The commonly used radio walkie-talkies usually range from 130 to 170. The 403-470 frequency bands are also within the range permitted by national law for individuals or organizations to use. Under normal circumstances, both of these wave frequencies travel in a straight line. The sea is an ideal communication environment for radio walkie-talkies on Earth, as there are generally no obstacles and very little interference. However, in reality, handheld walkie-talkies can only communicate for about 20 nautical miles at sea. This is because the Earth is round, and if the distance is too far, the middle will be blocked by seawater. So if you install the cable higher, the communication distance will also be longer.

When used in cities, obstacles are the factor that has the greatest impact on the distance of signal propagation. The actual communication distance of a 5-watt elevator wireless five-party intercom in cities is generally only within the range of 2 to 5 kilometers. In areas with high ground, many buildings or relatively sealed indoor Spaces, the communication distance will be even shorter. However, when supported by system base stations, the communication range of walkie-talkies can reach tens of kilometers or even several dozen kilometers.