干(gan)線(xian)放大(da)器(qi)是主干(gan)線(xian)纜傳(chuan)輸鏈路上(shang)的(de)雙(shuang)向信(xin)(xin)(xin)號(hao)(hao)處理(li)(li)放大(da)設(she)備。當(dang)主干(gan)線(xian)纜傳(chuan)輸距離長,或(huo)鏈路中負載器(qi)件數量較多,雙(shuang)向信(xin)(xin)(xin)號(hao)(hao)損耗過(guo)大(da),來(lai)自(zi)信(xin)(xin)(xin)號(hao)(hao)源(yuan)(下行(xing)(xing))或(huo)來(lai)自(zi)天(tian)線(xian)(上(shang)行(xing)(xing))的(de)信(xin)(xin)(xin)號(hao)(hao)強度偏低(di),相(xiang)關指(zhi)標將不能滿足設(she)計的(de)技術要求,將直接(jie)影響到室(shi)內天(tian)線(xian)的(de)端口發射功(gong)(gong)率(lv)和基(ji)站接(jie)收(shou)機(ji)(中繼臺))的(de)端口的(de)接(jie)收(shou)功(gong)(gong)率(lv),這(zhe)就必(bi)須在(zai)主干(gan)線(xian)纜傳(chuan)輸鏈路中的(de)適當(dang)位置增加干(gan)線(xian)放大(da)器(qi)設(she)備。干(gan)線(xian)放大(da)器(qi)具(ju)有(you)雙(shuang)向信(xin)(xin)(xin)號(hao)(hao)放大(da)功(gong)(gong)能,上(shang)行(xing)(xing)/下行(xing)(xing)信(xin)(xin)(xin)號(hao)(hao)處理(li)(li)及放大(da)電(dian)路
干(gan)線(xian)(xian)放大(da)器(qi)是主(zhu)干(gan)線(xian)(xian)纜傳(chuan)輸鏈路上(shang)(shang)的(de)(de)(de)雙(shuang)向(xiang)信號處理放大(da)設(she)備。當主(zhu)干(gan)線(xian)(xian)纜傳(chuan)輸距離長,或鏈路中負載器(qi)件(jian)數量較多,雙(shuang)向(xiang)信號損耗過大(da),來自(zi)信號源(下行)或來自(zi)天線(xian)(xian)(上(shang)(shang)行)的(de)(de)(de)信號強度偏低,相關指標將不(bu)能(neng)滿足(zu)設(she)計的(de)(de)(de)技(ji)術要求,將直接(jie)影響到(dao)室內天線(xian)(xian)的(de)(de)(de)端口發射功率和(he)基(ji)站接(jie)收機(中繼臺(tai)))的(de)(de)(de)端口的(de)(de)(de)接(jie)收功率,這就必須在主(zhu)干(gan)線(xian)(xian)纜傳(chuan)輸鏈路中的(de)(de)(de)適(shi)當位(wei)置(zhi)增加(jia)干(gan)線(xian)(xian)放大(da)器(qi)設(she)備。
干線放(fang)(fang)大器具有(you)雙向(xiang)信號放(fang)(fang)大功(gong)能,上行(xing)(xing)/下行(xing)(xing)信號處(chu)理及放(fang)(fang)大電(dian)路獨立分(fen)開(kai),上行(xing)(xing)/下行(xing)(xing)放(fang)(fang)大功(gong)率可單獨調(diao)節,可根據(ju)實際要求進行(xing)(xing)現場(chang)測(ce)驗后對(dui)上行(xing)(xing)/下行(xing)(xing)信號增益(yi)進行(xing)(xing)分(fen)別設置,這樣極大地(di)方便了系(xi)(xi)統調(diao)試,從(cong)而更有(you)效地(di)保(bao)證了系(xi)(xi)統的(de)安全穩定(ding)性(xing)和(he)建筑物(wu)內電(dian)磁環境滿足國(guo)家有(you)關標準。