干(gan)(gan)線(xian)(xian)(xian)放大(da)器是主干(gan)(gan)線(xian)(xian)(xian)纜傳輸(shu)鏈(lian)路上的(de)(de)(de)雙(shuang)(shuang)(shuang)向信(xin)號(hao)處理(li)放大(da)設(she)備。當主干(gan)(gan)線(xian)(xian)(xian)纜傳輸(shu)距離長,或鏈(lian)路中(zhong)(zhong)負載(zai)器件數量較多,雙(shuang)(shuang)(shuang)向信(xin)號(hao)損耗過大(da),來自(zi)信(xin)號(hao)源(下行(xing)(xing))或來自(zi)天(tian)線(xian)(xian)(xian)(上行(xing)(xing))的(de)(de)(de)信(xin)號(hao)強度偏低,相(xiang)關指標將不(bu)能(neng)滿(man)足設(she)計(ji)的(de)(de)(de)技術要求(qiu),將直接(jie)影響到室內天(tian)線(xian)(xian)(xian)的(de)(de)(de)端口發射功率和基站接(jie)收機(中(zhong)(zhong)繼臺))的(de)(de)(de)端口的(de)(de)(de)接(jie)收功率,這(zhe)就(jiu)必須(xu)在主干(gan)(gan)線(xian)(xian)(xian)纜傳輸(shu)鏈(lian)路中(zhong)(zhong)的(de)(de)(de)適當位置增加干(gan)(gan)線(xian)(xian)(xian)放大(da)器設(she)備。干(gan)(gan)線(xian)(xian)(xian)放大(da)器具有雙(shuang)(shuang)(shuang)向信(xin)號(hao)放大(da)功能(neng),上行(xing)(xing)/下行(xing)(xing)信(xin)號(hao)處理(li)及(ji)放大(da)電路
干線(xian)放大器(qi)是主(zhu)干線(xian)纜傳輸鏈(lian)(lian)路上的(de)雙向信(xin)號處理放大設備。當(dang)主(zhu)干線(xian)纜傳輸距離長,或(huo)(huo)鏈(lian)(lian)路中(zhong)(zhong)負載器(qi)件數量較多,雙向信(xin)號損耗過大,來自(zi)信(xin)號源(下(xia)行)或(huo)(huo)來自(zi)天線(xian)(上行)的(de)信(xin)號強度偏(pian)低,相關指(zhi)標將不能滿足設計(ji)的(de)技術要求(qiu),將直接(jie)影響(xiang)到室內天線(xian)的(de)端口發(fa)射功率(lv)和基站接(jie)收(shou)機(ji)(中(zhong)(zhong)繼(ji)臺))的(de)端口的(de)接(jie)收(shou)功率(lv),這就(jiu)必(bi)須在主(zhu)干線(xian)纜傳輸鏈(lian)(lian)路中(zhong)(zhong)的(de)適當(dang)位置增加(jia)干線(xian)放大器(qi)設備。
干(gan)線放(fang)大(da)器具有(you)雙向信號(hao)放(fang)大(da)功能(neng),上(shang)行/下(xia)行信號(hao)處理及放(fang)大(da)電路獨立(li)分(fen)開,上(shang)行/下(xia)行放(fang)大(da)功率可單獨調(diao)節,可根據實際要求進行現(xian)場測驗后對上(shang)行/下(xia)行信號(hao)增益(yi)進行分(fen)別(bie)設置(zhi),這樣(yang)極大(da)地(di)方便了(le)系統調(diao)試,從而更有(you)效地(di)保證(zheng)了(le)系統的安全穩定性和建筑物內電磁環境(jing)滿足國(guo)家有(you)關標準。