干線(xian)放(fang)(fang)(fang)大(da)器(qi)(qi)是主(zhu)干線(xian)纜傳(chuan)輸鏈(lian)(lian)路(lu)(lu)上(shang)的(de)雙向(xiang)(xiang)信(xin)號(hao)(hao)(hao)處理放(fang)(fang)(fang)大(da)設備(bei)。當(dang)主(zhu)干線(xian)纜傳(chuan)輸距離(li)長,或鏈(lian)(lian)路(lu)(lu)中負載器(qi)(qi)件數量較(jiao)多,雙向(xiang)(xiang)信(xin)號(hao)(hao)(hao)損耗過大(da),來(lai)自信(xin)號(hao)(hao)(hao)源(下行)或來(lai)自天(tian)線(xian)(上(shang)行)的(de)信(xin)號(hao)(hao)(hao)強(qiang)度偏低,相關指標將(jiang)不(bu)能(neng)(neng)滿(man)足設計的(de)技(ji)術要求(qiu),將(jiang)直接(jie)影響到室內(nei)天(tian)線(xian)的(de)端口發(fa)射功率(lv)和基站接(jie)收機(中繼臺))的(de)端口的(de)接(jie)收功率(lv),這就必須在主(zhu)干線(xian)纜傳(chuan)輸鏈(lian)(lian)路(lu)(lu)中的(de)適當(dang)位置增加干線(xian)放(fang)(fang)(fang)大(da)器(qi)(qi)設備(bei)。干線(xian)放(fang)(fang)(fang)大(da)器(qi)(qi)具有雙向(xiang)(xiang)信(xin)號(hao)(hao)(hao)放(fang)(fang)(fang)大(da)功能(neng)(neng),上(shang)行/下行信(xin)號(hao)(hao)(hao)處理及放(fang)(fang)(fang)大(da)電路(lu)(lu)
干線(xian)(xian)(xian)放大(da)(da)器是主干線(xian)(xian)(xian)纜傳輸(shu)鏈(lian)路上的(de)雙(shuang)向信(xin)(xin)(xin)號(hao)處理放大(da)(da)設備(bei)。當(dang)主干線(xian)(xian)(xian)纜傳輸(shu)距離長(chang),或鏈(lian)路中(zhong)(zhong)負載器件(jian)數量較(jiao)多,雙(shuang)向信(xin)(xin)(xin)號(hao)損(sun)耗過大(da)(da),來自(zi)信(xin)(xin)(xin)號(hao)源(yuan)(下行)或來自(zi)天(tian)線(xian)(xian)(xian)(上行)的(de)信(xin)(xin)(xin)號(hao)強(qiang)度偏低,相關指標將不能滿(man)足設計(ji)的(de)技術要求,將直接(jie)影(ying)響到室內天(tian)線(xian)(xian)(xian)的(de)端(duan)口發射(she)功率和基站接(jie)收機(中(zhong)(zhong)繼(ji)臺))的(de)端(duan)口的(de)接(jie)收功率,這就必須在主干線(xian)(xian)(xian)纜傳輸(shu)鏈(lian)路中(zhong)(zhong)的(de)適當(dang)位置增加(jia)干線(xian)(xian)(xian)放大(da)(da)器設備(bei)。
干線放(fang)大器具有雙(shuang)向信號(hao)放(fang)大功(gong)(gong)能,上行(xing)(xing)(xing)/下(xia)行(xing)(xing)(xing)信號(hao)處(chu)理及放(fang)大電(dian)路獨立分(fen)開(kai),上行(xing)(xing)(xing)/下(xia)行(xing)(xing)(xing)放(fang)大功(gong)(gong)率可單獨調節,可根據實際要求(qiu)進行(xing)(xing)(xing)現場測驗(yan)后(hou)對上行(xing)(xing)(xing)/下(xia)行(xing)(xing)(xing)信號(hao)增益進行(xing)(xing)(xing)分(fen)別(bie)設置,這樣極大地方便了(le)系統(tong)調試,從(cong)而更有效地保證了(le)系統(tong)的安全穩(wen)定性(xing)和建筑物內電(dian)磁環(huan)境(jing)滿足國家有關(guan)標(biao)準。