干(gan)線(xian)放(fang)大(da)器是(shi)主(zhu)(zhu)干(gan)線(xian)纜(lan)傳輸(shu)鏈(lian)路上(shang)的(de)(de)雙向信(xin)號(hao)(hao)處(chu)理(li)放(fang)大(da)設備(bei)。當主(zhu)(zhu)干(gan)線(xian)纜(lan)傳輸(shu)距離(li)長,或鏈(lian)路中負載器件數量較多,雙向信(xin)號(hao)(hao)損耗過大(da),來自信(xin)號(hao)(hao)源(下(xia)行(xing))或來自天線(xian)(上(shang)行(xing))的(de)(de)信(xin)號(hao)(hao)強度偏低,相關指標將不能滿足設計(ji)的(de)(de)技術要求,將直接影(ying)響到(dao)室內天線(xian)的(de)(de)端(duan)(duan)口發射功率(lv)和基(ji)站接收(shou)機(ji)(中繼(ji)臺))的(de)(de)端(duan)(duan)口的(de)(de)接收(shou)功率(lv),這(zhe)就必(bi)須(xu)在(zai)主(zhu)(zhu)干(gan)線(xian)纜(lan)傳輸(shu)鏈(lian)路中的(de)(de)適(shi)當位(wei)置增加干(gan)線(xian)放(fang)大(da)器設備(bei)。干(gan)線(xian)放(fang)大(da)器具有雙向信(xin)號(hao)(hao)放(fang)大(da)功能,上(shang)行(xing)/下(xia)行(xing)信(xin)號(hao)(hao)處(chu)理(li)及放(fang)大(da)電路
干線(xian)放(fang)(fang)大(da)器(qi)是主干線(xian)纜(lan)傳輸(shu)鏈(lian)(lian)路上(shang)的雙向信號處(chu)理放(fang)(fang)大(da)設備。當主干線(xian)纜(lan)傳輸(shu)距離長,或(huo)鏈(lian)(lian)路中(zhong)(zhong)負載器(qi)件數(shu)量(liang)較多,雙向信號損耗過大(da),來(lai)自信號源(下行(xing))或(huo)來(lai)自天線(xian)(上(shang)行(xing))的信號強度偏低,相(xiang)關指標將不(bu)能(neng)滿(man)足(zu)設計(ji)的技術要求(qiu),將直(zhi)接(jie)影響(xiang)到(dao)室(shi)內(nei)天線(xian)的端口發射功(gong)(gong)率(lv)和基站接(jie)收機(中(zhong)(zhong)繼臺))的端口的接(jie)收功(gong)(gong)率(lv),這就必須在主干線(xian)纜(lan)傳輸(shu)鏈(lian)(lian)路中(zhong)(zhong)的適當位置(zhi)增(zeng)加干線(xian)放(fang)(fang)大(da)器(qi)設備。
干線(xian)放(fang)(fang)大(da)器(qi)具有(you)(you)雙向信(xin)號放(fang)(fang)大(da)功能,上行(xing)(xing)/下行(xing)(xing)信(xin)號處理及放(fang)(fang)大(da)電(dian)路獨立分(fen)開,上行(xing)(xing)/下行(xing)(xing)放(fang)(fang)大(da)功率可單獨調(diao)節,可根據(ju)實(shi)際要求(qiu)進行(xing)(xing)現(xian)場測驗后對上行(xing)(xing)/下行(xing)(xing)信(xin)號增益進行(xing)(xing)分(fen)別設置,這樣(yang)極大(da)地方(fang)便了系統(tong)(tong)調(diao)試,從而更有(you)(you)效地保證了系統(tong)(tong)的安全(quan)穩定性和建筑物內電(dian)磁環境滿(man)足國家(jia)有(you)(you)關(guan)標準(zhun)。