干(gan)線(xian)(xian)放大(da)(da)器(qi)是主干(gan)線(xian)(xian)纜傳(chuan)輸(shu)鏈路上(shang)的(de)雙向信(xin)號(hao)處(chu)理放大(da)(da)設(she)(she)備(bei)。當(dang)主干(gan)線(xian)(xian)纜傳(chuan)輸(shu)距(ju)離(li)長,或鏈路中(zhong)負載(zai)器(qi)件(jian)數(shu)量較多,雙向信(xin)號(hao)損耗過(guo)大(da)(da),來自信(xin)號(hao)源(下行)或來自天線(xian)(xian)(上(shang)行)的(de)信(xin)號(hao)強度偏低,相關指(zhi)標(biao)將不能(neng)滿足(zu)設(she)(she)計的(de)技術要求(qiu),將直接影響到室內天線(xian)(xian)的(de)端口發射(she)功(gong)(gong)(gong)率和基站接收(shou)機(中(zhong)繼臺))的(de)端口的(de)接收(shou)功(gong)(gong)(gong)率,這就必須在主干(gan)線(xian)(xian)纜傳(chuan)輸(shu)鏈路中(zhong)的(de)適當(dang)位置增加干(gan)線(xian)(xian)放大(da)(da)器(qi)設(she)(she)備(bei)。干(gan)線(xian)(xian)放大(da)(da)器(qi)具有雙向信(xin)號(hao)放大(da)(da)功(gong)(gong)(gong)能(neng),上(shang)行/下行信(xin)號(hao)處(chu)理及放大(da)(da)電路
干(gan)(gan)線(xian)(xian)放(fang)(fang)大器是主(zhu)(zhu)干(gan)(gan)線(xian)(xian)纜傳(chuan)輸鏈路上的(de)雙向信(xin)(xin)號(hao)處理放(fang)(fang)大設備。當主(zhu)(zhu)干(gan)(gan)線(xian)(xian)纜傳(chuan)輸距離長,或(huo)鏈路中(zhong)負載器件數量較(jiao)多,雙向信(xin)(xin)號(hao)損耗過(guo)大,來自信(xin)(xin)號(hao)源(下(xia)行)或(huo)來自天線(xian)(xian)(上行)的(de)信(xin)(xin)號(hao)強度偏低,相關指標將(jiang)不能滿(man)足設計的(de)技術要求,將(jiang)直接(jie)影響到(dao)室內天線(xian)(xian)的(de)端口(kou)發射功(gong)(gong)率和基站(zhan)接(jie)收(shou)機(ji)(中(zhong)繼臺))的(de)端口(kou)的(de)接(jie)收(shou)功(gong)(gong)率,這就必須在(zai)主(zhu)(zhu)干(gan)(gan)線(xian)(xian)纜傳(chuan)輸鏈路中(zhong)的(de)適當位置增加干(gan)(gan)線(xian)(xian)放(fang)(fang)大器設備。
干線放(fang)(fang)大器具有雙向信(xin)號(hao)放(fang)(fang)大功能(neng),上行(xing)(xing)/下(xia)行(xing)(xing)信(xin)號(hao)處(chu)理及放(fang)(fang)大電(dian)路(lu)獨立分開(kai),上行(xing)(xing)/下(xia)行(xing)(xing)放(fang)(fang)大功率可(ke)單獨調(diao)節,可(ke)根據(ju)實(shi)際要求(qiu)進(jin)行(xing)(xing)現場測驗后對上行(xing)(xing)/下(xia)行(xing)(xing)信(xin)號(hao)增(zeng)益進(jin)行(xing)(xing)分別設置,這樣(yang)極(ji)大地(di)方便了(le)系統調(diao)試,從而更有效(xiao)地(di)保證(zheng)了(le)系統的安(an)全(quan)穩定(ding)性和建筑物(wu)內(nei)電(dian)磁環境滿足國家有關標(biao)準。