Hur långt är överföringsavståndet för den trådlösa fempartsintercom i hissen

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, och om avståndet är för långt kommer mitten att blockeras av havsvatten . så om du installerar kabeln högre kommer kommunikationsavståndet också att vara längre .

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 Kortare . Men när de stöds av systembasstationer kan kommunikationsområdet för walkie-talkies nå tiotals kilometer eller till och med flera dussin kilometer .