係{車立}度收唔到電話

2007-02-02 12:50 am
點解係{車立}度收唔到電話呢?

回答 (2)

2007-02-02 1:40 am
✔ 最佳答案
normally elevator is made of metal, a big metal case.

metal have property that it can shield certain kind of radio wave, so when you are in the elevator all the signal (radio wave) are blocked, like you put yr phone in a biscuit can. in certain commercial building repeated was install in the elevator well so fm there you may receive / make a phone call. however install this device is costly so not a lot of building equipped with that.
參考: i am a telecom engineer
2007-02-02 1:28 am
咁有咩出奇呢,唔係每部電梯都可以收到電話的,無接收站就收不到,亦都唔係個個台都收唔,到,可能咁啱你個台收唔到啫


收錄日期: 2021-04-12 18:57:57
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