干線(xian)(xian)(xian)(xian)放(fang)大(da)(da)(da)器(qi)是(shi)主(zhu)干線(xian)(xian)(xian)(xian)纜(lan)傳輸(shu)鏈(lian)路上的雙(shuang)向(xiang)(xiang)信(xin)號(hao)(hao)處(chu)理放(fang)大(da)(da)(da)設(she)備(bei)。當主(zhu)干線(xian)(xian)(xian)(xian)纜(lan)傳輸(shu)距離長,或鏈(lian)路中(zhong)(zhong)負載器(qi)件數量較多,雙(shuang)向(xiang)(xiang)信(xin)號(hao)(hao)損耗過大(da)(da)(da),來自(zi)信(xin)號(hao)(hao)源(下行)或來自(zi)天(tian)線(xian)(xian)(xian)(xian)(上行)的信(xin)號(hao)(hao)強(qiang)度(du)偏(pian)低(di),相關指標將不能滿足設(she)計(ji)的技術要求,將直接(jie)影響到室內天(tian)線(xian)(xian)(xian)(xian)的端口發射功(gong)率(lv)(lv)和基站接(jie)收機(中(zhong)(zhong)繼臺))的端口的接(jie)收功(gong)率(lv)(lv),這(zhe)就必須在主(zhu)干線(xian)(xian)(xian)(xian)纜(lan)傳輸(shu)鏈(lian)路中(zhong)(zhong)的適(shi)當位置(zhi)增加干線(xian)(xian)(xian)(xian)放(fang)大(da)(da)(da)器(qi)設(she)備(bei)。干線(xian)(xian)(xian)(xian)放(fang)大(da)(da)(da)器(qi)具有雙(shuang)向(xiang)(xiang)信(xin)號(hao)(hao)放(fang)大(da)(da)(da)功(gong)能,上行/下行信(xin)號(hao)(hao)處(chu)理及放(fang)大(da)(da)(da)電路
干(gan)線(xian)(xian)放大(da)(da)(da)(da)器是主(zhu)干(gan)線(xian)(xian)纜(lan)傳(chuan)輸鏈路上(shang)的(de)(de)(de)(de)雙(shuang)向信(xin)號處理放大(da)(da)(da)(da)設備。當主(zhu)干(gan)線(xian)(xian)纜(lan)傳(chuan)輸距離長,或鏈路中(zhong)負載器件數量較多,雙(shuang)向信(xin)號損耗(hao)過大(da)(da)(da)(da),來自(zi)信(xin)號源(下行)或來自(zi)天線(xian)(xian)(上(shang)行)的(de)(de)(de)(de)信(xin)號強度偏低,相(xiang)關指標將(jiang)不能滿足設計的(de)(de)(de)(de)技術要求,將(jiang)直接(jie)影(ying)響到(dao)室內(nei)天線(xian)(xian)的(de)(de)(de)(de)端口(kou)(kou)發射功(gong)率(lv)和基站接(jie)收機(中(zhong)繼臺))的(de)(de)(de)(de)端口(kou)(kou)的(de)(de)(de)(de)接(jie)收功(gong)率(lv),這(zhe)就(jiu)必須在主(zhu)干(gan)線(xian)(xian)纜(lan)傳(chuan)輸鏈路中(zhong)的(de)(de)(de)(de)適當位置(zhi)增加(jia)干(gan)線(xian)(xian)放大(da)(da)(da)(da)器設備。
干線放(fang)大器具有(you)雙向信號放(fang)大功能,上行(xing)(xing)/下(xia)行(xing)(xing)信號處理及放(fang)大電(dian)路(lu)獨立分(fen)開(kai),上行(xing)(xing)/下(xia)行(xing)(xing)放(fang)大功率可(ke)(ke)單獨調節,可(ke)(ke)根據實際要求進(jin)行(xing)(xing)現場(chang)測驗(yan)后對上行(xing)(xing)/下(xia)行(xing)(xing)信號增益進(jin)行(xing)(xing)分(fen)別設置,這樣極大地方便了系(xi)統調試,從而更有(you)效(xiao)地保證(zheng)了系(xi)統的安全穩定性(xing)和建筑物內電(dian)磁環境滿足(zu)國家有(you)關標準(zhun)。