干線(xian)(xian)(xian)(xian)放大(da)(da)器(qi)(qi)(qi)是主干線(xian)(xian)(xian)(xian)纜傳(chuan)輸(shu)鏈路上的(de)(de)雙向信(xin)(xin)(xin)號(hao)(hao)(hao)處理(li)放大(da)(da)設備。當(dang)主干線(xian)(xian)(xian)(xian)纜傳(chuan)輸(shu)距離長,或(huo)鏈路中(zhong)(zhong)負載器(qi)(qi)(qi)件(jian)數量較多,雙向信(xin)(xin)(xin)號(hao)(hao)(hao)損(sun)耗過大(da)(da),來自(zi)信(xin)(xin)(xin)號(hao)(hao)(hao)源(yuan)(下行(xing))或(huo)來自(zi)天(tian)線(xian)(xian)(xian)(xian)(上行(xing))的(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)度偏低,相關指標(biao)將不能(neng)滿足設計的(de)(de)技術要求,將直接影(ying)響到室內天(tian)線(xian)(xian)(xian)(xian)的(de)(de)端(duan)口發射(she)功率(lv)和基(ji)站接收機(中(zhong)(zhong)繼臺))的(de)(de)端(duan)口的(de)(de)接收功率(lv),這就必須在主干線(xian)(xian)(xian)(xian)纜傳(chuan)輸(shu)鏈路中(zhong)(zhong)的(de)(de)適(shi)當(dang)位置增加干線(xian)(xian)(xian)(xian)放大(da)(da)器(qi)(qi)(qi)設備。干線(xian)(xian)(xian)(xian)放大(da)(da)器(qi)(qi)(qi)具(ju)有(you)雙向信(xin)(xin)(xin)號(hao)(hao)(hao)放大(da)(da)功能(neng),上行(xing)/下行(xing)信(xin)(xin)(xin)號(hao)(hao)(hao)處理(li)及放大(da)(da)電(dian)路
干線(xian)放(fang)(fang)大器是(shi)主(zhu)(zhu)干線(xian)纜(lan)傳輸(shu)鏈(lian)路上的(de)雙(shuang)向信號處理放(fang)(fang)大設(she)(she)備(bei)。當主(zhu)(zhu)干線(xian)纜(lan)傳輸(shu)距離長,或(huo)鏈(lian)路中(zhong)負載(zai)器件數量較多,雙(shuang)向信號損耗(hao)過大,來自(zi)信號源(下行(xing))或(huo)來自(zi)天線(xian)(上行(xing))的(de)信號強度偏低,相關(guan)指標將不能滿足設(she)(she)計的(de)技(ji)術(shu)要求,將直接影(ying)響到(dao)室內天線(xian)的(de)端(duan)口(kou)發(fa)射功率和基站接收機(中(zhong)繼臺))的(de)端(duan)口(kou)的(de)接收功率,這就必須在主(zhu)(zhu)干線(xian)纜(lan)傳輸(shu)鏈(lian)路中(zhong)的(de)適當位置增加干線(xian)放(fang)(fang)大器設(she)(she)備(bei)。
干線放(fang)(fang)大(da)器(qi)具(ju)有雙向(xiang)信號放(fang)(fang)大(da)功能(neng),上(shang)行(xing)/下(xia)行(xing)信號處(chu)理及放(fang)(fang)大(da)電(dian)路(lu)獨立分(fen)開,上(shang)行(xing)/下(xia)行(xing)放(fang)(fang)大(da)功率可(ke)(ke)單獨調節(jie),可(ke)(ke)根據實際要求進行(xing)現場測(ce)驗后對上(shang)行(xing)/下(xia)行(xing)信號增益進行(xing)分(fen)別設置,這樣極(ji)大(da)地方便了系統(tong)調試,從而(er)更有效地保證了系統(tong)的安全穩定性和建(jian)筑物內電(dian)磁環境滿足國家有關(guan)標準。