ABB CM772F 3BDH000368R0001? 干擾會(huì)降低信號(hào)質(zhì)量

與有線系統(tǒng)相比，無(wú)線網(wǎng)絡(luò)經(jīng)常受到電磁干擾。這可能是由于其它網(wǎng)絡(luò)或其它類型的設(shè)備產(chǎn)生的無(wú)線電波位于或接近用于通信的無(wú)線電波段。干擾會(huì)降低信號(hào)質(zhì)量或?qū)е孪到y(tǒng)故障。[4]

一些材料導(dǎo)致吸收在其他情況下，特別是在金屬或?qū)щ姴牧系那闆r下，會(huì)發(fā)生反射。這可能導(dǎo)致接收不到信號(hào)的死區(qū)。現(xiàn)代家庭中的鋁箔隔熱可以輕松地將室內(nèi)移動(dòng)信號(hào)降低10 dB，這經(jīng)常導(dǎo)致對(duì)長(zhǎng)途農(nóng)村手機(jī)信號(hào)接收不良的投訴。

在…里多徑衰落由于反射，信號(hào)采用的兩個(gè)或多個(gè)不同路徑會(huì)導(dǎo)致信號(hào)在某些位置相互抵消，而在其他位置更強(qiáng)


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ABB 3BHB000272R0001

ABB KUC720AE01 3BHB003431R0001 3BHB000652R0001

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