干(gan)線(xian)(xian)(xian)(xian)放(fang)大(da)器(qi)是主(zhu)(zhu)干(gan)線(xian)(xian)(xian)(xian)纜傳(chuan)輸鏈(lian)路(lu)(lu)(lu)上的(de)雙(shuang)向信號(hao)處(chu)理(li)放(fang)大(da)設備。當主(zhu)(zhu)干(gan)線(xian)(xian)(xian)(xian)纜傳(chuan)輸距離長,或鏈(lian)路(lu)(lu)(lu)中(zhong)負載器(qi)件數(shu)量較多,雙(shuang)向信號(hao)損耗過(guo)大(da),來(lai)(lai)自信號(hao)源(下行)或來(lai)(lai)自天(tian)線(xian)(xian)(xian)(xian)(上行)的(de)信號(hao)強度偏低(di),相(xiang)關指標(biao)將(jiang)不能滿足設計的(de)技術要求,將(jiang)直(zhi)接影響到室內天(tian)線(xian)(xian)(xian)(xian)的(de)端口發射功率和基(ji)站接收機(中(zhong)繼臺(tai)))的(de)端口的(de)接收功率,這就必(bi)須在主(zhu)(zhu)干(gan)線(xian)(xian)(xian)(xian)纜傳(chuan)輸鏈(lian)路(lu)(lu)(lu)中(zhong)的(de)適當位置增加(jia)干(gan)線(xian)(xian)(xian)(xian)放(fang)大(da)器(qi)設備。干(gan)線(xian)(xian)(xian)(xian)放(fang)大(da)器(qi)具有雙(shuang)向信號(hao)放(fang)大(da)功能,上行/下行信號(hao)處(chu)理(li)及放(fang)大(da)電路(lu)(lu)(lu)
干線(xian)放大(da)(da)器(qi)(qi)是主干線(xian)纜傳(chuan)(chuan)輸(shu)鏈(lian)(lian)路(lu)上的雙(shuang)向信(xin)號處理放大(da)(da)設備。當(dang)主干線(xian)纜傳(chuan)(chuan)輸(shu)距離長(chang),或鏈(lian)(lian)路(lu)中負載器(qi)(qi)件數(shu)量較多,雙(shuang)向信(xin)號損耗過大(da)(da),來自(zi)信(xin)號源(下(xia)行)或來自(zi)天線(xian)(上行)的信(xin)號強度偏低,相關指標(biao)將不能滿(man)足設計的技術要求,將直接影響(xiang)到室(shi)內(nei)天線(xian)的端口(kou)發(fa)射功率(lv)和(he)基站接收機(中繼(ji)臺))的端口(kou)的接收功率(lv),這就必須在主干線(xian)纜傳(chuan)(chuan)輸(shu)鏈(lian)(lian)路(lu)中的適當(dang)位置增(zeng)加干線(xian)放大(da)(da)器(qi)(qi)設備。
干線放大(da)器具有(you)(you)雙向信(xin)號放大(da)功能,上行(xing)(xing)/下行(xing)(xing)信(xin)號處理及(ji)放大(da)電路獨立(li)分開,上行(xing)(xing)/下行(xing)(xing)放大(da)功率可單獨調節,可根(gen)據實際要求進行(xing)(xing)現場測驗后對(dui)上行(xing)(xing)/下行(xing)(xing)信(xin)號增益進行(xing)(xing)分別設置(zhi),這樣極大(da)地方(fang)便了系統調試(shi),從而更有(you)(you)效地保證(zheng)了系統的安(an)全(quan)穩定(ding)性(xing)和建筑(zhu)物內電磁環境滿足國(guo)家(jia)有(you)(you)關標準。