干(gan)線(xian)(xian)(xian)(xian)(xian)放(fang)大(da)(da)(da)器是主(zhu)干(gan)線(xian)(xian)(xian)(xian)(xian)纜傳(chuan)輸(shu)鏈(lian)路(lu)(lu)上的(de)(de)雙(shuang)(shuang)向信(xin)號處(chu)理(li)(li)放(fang)大(da)(da)(da)設備。當主(zhu)干(gan)線(xian)(xian)(xian)(xian)(xian)纜傳(chuan)輸(shu)距離長,或(huo)鏈(lian)路(lu)(lu)中(zhong)負載器件數量較多,雙(shuang)(shuang)向信(xin)號損耗過大(da)(da)(da),來自信(xin)號源(下行)或(huo)來自天線(xian)(xian)(xian)(xian)(xian)(上行)的(de)(de)信(xin)號強度偏(pian)低,相關指標(biao)將不(bu)能滿(man)足設計的(de)(de)技術要(yao)求,將直接(jie)影響(xiang)到室內天線(xian)(xian)(xian)(xian)(xian)的(de)(de)端口(kou)(kou)發射功率和基站接(jie)收機(中(zhong)繼臺))的(de)(de)端口(kou)(kou)的(de)(de)接(jie)收功率,這就必須在主(zhu)干(gan)線(xian)(xian)(xian)(xian)(xian)纜傳(chuan)輸(shu)鏈(lian)路(lu)(lu)中(zhong)的(de)(de)適當位置增(zeng)加干(gan)線(xian)(xian)(xian)(xian)(xian)放(fang)大(da)(da)(da)器設備。干(gan)線(xian)(xian)(xian)(xian)(xian)放(fang)大(da)(da)(da)器具有雙(shuang)(shuang)向信(xin)號放(fang)大(da)(da)(da)功能,上行/下行信(xin)號處(chu)理(li)(li)及放(fang)大(da)(da)(da)電路(lu)(lu)
干(gan)線放(fang)大器是(shi)主干(gan)線纜傳輸鏈路上的(de)(de)(de)(de)雙向(xiang)信(xin)號(hao)處理(li)放(fang)大設備(bei)。當主干(gan)線纜傳輸距離長,或(huo)鏈路中(zhong)負(fu)載(zai)器件數量較(jiao)多,雙向(xiang)信(xin)號(hao)損(sun)耗過(guo)大,來(lai)自信(xin)號(hao)源(下行)或(huo)來(lai)自天線(上行)的(de)(de)(de)(de)信(xin)號(hao)強(qiang)度偏低,相關指標將不(bu)能(neng)滿足設計的(de)(de)(de)(de)技術要(yao)求,將直接影(ying)響到(dao)室內天線的(de)(de)(de)(de)端(duan)口(kou)發射功率和基站接收機(ji)(中(zhong)繼臺))的(de)(de)(de)(de)端(duan)口(kou)的(de)(de)(de)(de)接收功率,這就必須在主干(gan)線纜傳輸鏈路中(zhong)的(de)(de)(de)(de)適當位置(zhi)增(zeng)加干(gan)線放(fang)大器設備(bei)。
干線(xian)放大器具有雙向信(xin)號放大功能,上行(xing)(xing)(xing)(xing)/下(xia)行(xing)(xing)(xing)(xing)信(xin)號處理及(ji)放大電路獨立分開,上行(xing)(xing)(xing)(xing)/下(xia)行(xing)(xing)(xing)(xing)放大功率可(ke)單獨調(diao)節,可(ke)根據實際要求進(jin)行(xing)(xing)(xing)(xing)現(xian)場測驗后對(dui)上行(xing)(xing)(xing)(xing)/下(xia)行(xing)(xing)(xing)(xing)信(xin)號增益進(jin)行(xing)(xing)(xing)(xing)分別設置(zhi),這樣(yang)極大地(di)方(fang)便了(le)系(xi)統(tong)調(diao)試,從而更有效地(di)保證了(le)系(xi)統(tong)的安全穩定性和(he)建筑物內電磁(ci)環境滿(man)足國家(jia)有關標準。