干線(xian)放(fang)(fang)(fang)大器(qi)是主干線(xian)纜傳輸(shu)鏈(lian)(lian)路上(shang)(shang)的雙向信號處理放(fang)(fang)(fang)大設(she)備。當主干線(xian)纜傳輸(shu)距(ju)離長(chang),或(huo)(huo)鏈(lian)(lian)路中負載器(qi)件數量較多,雙向信號損耗過大,來自信號源(yuan)(下行(xing))或(huo)(huo)來自天線(xian)(上(shang)(shang)行(xing))的信號強(qiang)度偏(pian)低,相(xiang)關(guan)指(zhi)標將不能滿足設(she)計(ji)的技術要(yao)求,將直接(jie)影響(xiang)到室內天線(xian)的端口發射功(gong)率和(he)基站接(jie)收機(中繼(ji)臺))的端口的接(jie)收功(gong)率,這就必須在主干線(xian)纜傳輸(shu)鏈(lian)(lian)路中的適當位(wei)置(zhi)增加干線(xian)放(fang)(fang)(fang)大器(qi)設(she)備。干線(xian)放(fang)(fang)(fang)大器(qi)具有(you)雙向信號放(fang)(fang)(fang)大功(gong)能,上(shang)(shang)行(xing)/下行(xing)信號處理及放(fang)(fang)(fang)大電(dian)路
干(gan)線(xian)(xian)(xian)(xian)放(fang)大器是主干(gan)線(xian)(xian)(xian)(xian)纜傳輸鏈路上的(de)(de)雙向信(xin)(xin)號(hao)處理(li)放(fang)大設(she)備。當主干(gan)線(xian)(xian)(xian)(xian)纜傳輸距離(li)長,或鏈路中(zhong)負載(zai)器件(jian)數量較多,雙向信(xin)(xin)號(hao)損耗過大,來(lai)自(zi)(zi)信(xin)(xin)號(hao)源(yuan)(下行)或來(lai)自(zi)(zi)天線(xian)(xian)(xian)(xian)(上行)的(de)(de)信(xin)(xin)號(hao)強度偏低,相關指(zhi)標將不(bu)能滿足設(she)計(ji)的(de)(de)技術要(yao)求(qiu),將直接(jie)影(ying)響到室內天線(xian)(xian)(xian)(xian)的(de)(de)端口(kou)(kou)發射功(gong)率和基站接(jie)收機(中(zhong)繼臺(tai)))的(de)(de)端口(kou)(kou)的(de)(de)接(jie)收功(gong)率,這就必須在(zai)主干(gan)線(xian)(xian)(xian)(xian)纜傳輸鏈路中(zhong)的(de)(de)適當位(wei)置增加干(gan)線(xian)(xian)(xian)(xian)放(fang)大器設(she)備。
干(gan)線(xian)放大器具有雙向信號放大功能,上行(xing)/下行(xing)信號處理(li)及(ji)放大電(dian)路(lu)獨(du)立分開,上行(xing)/下行(xing)放大功率可(ke)單獨(du)調節,可(ke)根據實際要求進行(xing)現場測驗后對上行(xing)/下行(xing)信號增益進行(xing)分別設(she)置,這(zhe)樣極大地(di)方便了系統調試,從而(er)更(geng)有效地(di)保證(zheng)了系統的安(an)全穩定性和建筑物內電(dian)磁環境滿足(zu)國家有關標(biao)準(zhun)。