干線(xian)(xian)放(fang)(fang)大器是主干線(xian)(xian)纜(lan)傳(chuan)輸鏈(lian)路(lu)上(shang)的(de)(de)雙向信(xin)號處(chu)理(li)(li)放(fang)(fang)大設備。當(dang)主干線(xian)(xian)纜(lan)傳(chuan)輸距離(li)長(chang),或(huo)鏈(lian)路(lu)中負載器件(jian)數量較多,雙向信(xin)號損耗過大,來(lai)自信(xin)號源(下行(xing)(xing))或(huo)來(lai)自天線(xian)(xian)(上(shang)行(xing)(xing))的(de)(de)信(xin)號強度偏低,相(xiang)關指標將不能(neng)滿足設計(ji)的(de)(de)技術要求,將直(zhi)接影(ying)響到室內天線(xian)(xian)的(de)(de)端口(kou)發射功(gong)率和(he)基(ji)站接收機(中繼(ji)臺(tai)))的(de)(de)端口(kou)的(de)(de)接收功(gong)率,這就必(bi)須在主干線(xian)(xian)纜(lan)傳(chuan)輸鏈(lian)路(lu)中的(de)(de)適當(dang)位(wei)置增加干線(xian)(xian)放(fang)(fang)大器設備。干線(xian)(xian)放(fang)(fang)大器具有(you)雙向信(xin)號放(fang)(fang)大功(gong)能(neng),上(shang)行(xing)(xing)/下行(xing)(xing)信(xin)號處(chu)理(li)(li)及(ji)放(fang)(fang)大電(dian)路(lu)
干線(xian)(xian)(xian)放(fang)(fang)大(da)(da)器是主干線(xian)(xian)(xian)纜(lan)(lan)傳(chuan)輸鏈路上(shang)的(de)(de)雙向信(xin)號(hao)(hao)處理放(fang)(fang)大(da)(da)設(she)備(bei)。當主干線(xian)(xian)(xian)纜(lan)(lan)傳(chuan)輸距離長,或(huo)鏈路中(zhong)負載(zai)器件數(shu)量較多,雙向信(xin)號(hao)(hao)損耗(hao)過大(da)(da),來(lai)(lai)自信(xin)號(hao)(hao)源(下(xia)行(xing))或(huo)來(lai)(lai)自天(tian)(tian)線(xian)(xian)(xian)(上(shang)行(xing))的(de)(de)信(xin)號(hao)(hao)強度偏低,相關指(zhi)標將(jiang)不能滿(man)足設(she)計的(de)(de)技術要求,將(jiang)直(zhi)接影響到室內天(tian)(tian)線(xian)(xian)(xian)的(de)(de)端口發射功(gong)(gong)率和基站接收機(ji)(中(zhong)繼臺))的(de)(de)端口的(de)(de)接收功(gong)(gong)率,這就(jiu)必須在主干線(xian)(xian)(xian)纜(lan)(lan)傳(chuan)輸鏈路中(zhong)的(de)(de)適當位置增加干線(xian)(xian)(xian)放(fang)(fang)大(da)(da)器設(she)備(bei)。
干線放(fang)(fang)大(da)器具有雙向信號(hao)放(fang)(fang)大(da)功能,上行(xing)/下(xia)行(xing)信號(hao)處理及放(fang)(fang)大(da)電路獨立(li)分開,上行(xing)/下(xia)行(xing)放(fang)(fang)大(da)功率可單獨調節,可根(gen)據實際(ji)要求進行(xing)現場測驗(yan)后對(dui)上行(xing)/下(xia)行(xing)信號(hao)增益進行(xing)分別設置,這樣極大(da)地方便了(le)系統(tong)調試,從而更有效地保證了(le)系統(tong)的安全(quan)穩定(ding)性和(he)建(jian)筑物內電磁環境(jing)滿足國(guo)家(jia)有關標準(zhun)。