干線(xian)(xian)(xian)放(fang)大(da)(da)器(qi)是主干線(xian)(xian)(xian)纜(lan)傳輸(shu)鏈(lian)(lian)路(lu)上(shang)(shang)的(de)雙(shuang)向(xiang)信(xin)號(hao)處理放(fang)大(da)(da)設備(bei)。當主干線(xian)(xian)(xian)纜(lan)傳輸(shu)距離長,或鏈(lian)(lian)路(lu)中(zhong)負載(zai)器(qi)件數量較多,雙(shuang)向(xiang)信(xin)號(hao)損耗過(guo)大(da)(da),來自信(xin)號(hao)源(下(xia)行)或來自天線(xian)(xian)(xian)(上(shang)(shang)行)的(de)信(xin)號(hao)強度偏低,相關指標將不能滿足設計(ji)的(de)技術(shu)要求,將直接(jie)影響到室(shi)內天線(xian)(xian)(xian)的(de)端口發射功(gong)率和基站(zhan)接(jie)收機(中(zhong)繼(ji)臺))的(de)端口的(de)接(jie)收功(gong)率,這(zhe)就必須在主干線(xian)(xian)(xian)纜(lan)傳輸(shu)鏈(lian)(lian)路(lu)中(zhong)的(de)適(shi)當位置(zhi)增加(jia)干線(xian)(xian)(xian)放(fang)大(da)(da)器(qi)設備(bei)。干線(xian)(xian)(xian)放(fang)大(da)(da)器(qi)具(ju)有雙(shuang)向(xiang)信(xin)號(hao)放(fang)大(da)(da)功(gong)能,上(shang)(shang)行/下(xia)行信(xin)號(hao)處理及放(fang)大(da)(da)電路(lu)
干線(xian)放大器是主(zhu)干線(xian)纜傳(chuan)輸鏈路(lu)上(shang)的(de)(de)(de)雙(shuang)向信號處理放大設備。當主(zhu)干線(xian)纜傳(chuan)輸距離長,或鏈路(lu)中(zhong)負載器件數量較多,雙(shuang)向信號損(sun)耗過(guo)大,來自(zi)信號源(下行)或來自(zi)天(tian)線(xian)(上(shang)行)的(de)(de)(de)信號強度偏低,相關(guan)指標將不能滿(man)足設計的(de)(de)(de)技術(shu)要求,將直接影(ying)響到室內天(tian)線(xian)的(de)(de)(de)端口發射功率和基站接收(shou)機(中(zhong)繼臺))的(de)(de)(de)端口的(de)(de)(de)接收(shou)功率,這就必須在主(zhu)干線(xian)纜傳(chuan)輸鏈路(lu)中(zhong)的(de)(de)(de)適(shi)當位(wei)置增(zeng)加干線(xian)放大器設備。
干線放大(da)器具(ju)有雙向信(xin)號放大(da)功能,上(shang)行(xing)(xing)(xing)/下(xia)行(xing)(xing)(xing)信(xin)號處理(li)及放大(da)電路獨立分開,上(shang)行(xing)(xing)(xing)/下(xia)行(xing)(xing)(xing)放大(da)功率可(ke)單獨調(diao)節,可(ke)根據實際要求進(jin)行(xing)(xing)(xing)現場(chang)測驗后對上(shang)行(xing)(xing)(xing)/下(xia)行(xing)(xing)(xing)信(xin)號增(zeng)益(yi)進(jin)行(xing)(xing)(xing)分別設置(zhi),這樣極大(da)地方(fang)便了系統調(diao)試,從而更有效地保(bao)證(zheng)了系統的安全(quan)穩定性(xing)和建(jian)筑物內電磁環境滿足(zu)國家有關標準。