干(gan)線(xian)(xian)(xian)(xian)放大(da)(da)器(qi)是主(zhu)干(gan)線(xian)(xian)(xian)(xian)纜(lan)傳輸鏈路(lu)上的(de)雙向信(xin)號處(chu)理(li)放大(da)(da)設備(bei)。當(dang)主(zhu)干(gan)線(xian)(xian)(xian)(xian)纜(lan)傳輸距離長,或(huo)鏈路(lu)中負(fu)載器(qi)件數量較多(duo),雙向信(xin)號損耗過大(da)(da),來(lai)自信(xin)號源(下行(xing))或(huo)來(lai)自天線(xian)(xian)(xian)(xian)(上行(xing))的(de)信(xin)號強度偏低,相(xiang)關指(zhi)標將(jiang)(jiang)不能滿(man)足設計的(de)技術要求(qiu),將(jiang)(jiang)直接(jie)影響到室內天線(xian)(xian)(xian)(xian)的(de)端口發射功(gong)率和基站接(jie)收機(中繼(ji)臺))的(de)端口的(de)接(jie)收功(gong)率,這就必須在主(zhu)干(gan)線(xian)(xian)(xian)(xian)纜(lan)傳輸鏈路(lu)中的(de)適當(dang)位置增加干(gan)線(xian)(xian)(xian)(xian)放大(da)(da)器(qi)設備(bei)。干(gan)線(xian)(xian)(xian)(xian)放大(da)(da)器(qi)具有雙向信(xin)號放大(da)(da)功(gong)能,上行(xing)/下行(xing)信(xin)號處(chu)理(li)及放大(da)(da)電路(lu)
干線(xian)(xian)放(fang)大器(qi)(qi)是主(zhu)干線(xian)(xian)纜傳(chuan)輸鏈路上(shang)的(de)(de)(de)雙向信號(hao)(hao)處(chu)理(li)放(fang)大設備(bei)。當(dang)主(zhu)干線(xian)(xian)纜傳(chuan)輸距離長(chang),或鏈路中(zhong)負載器(qi)(qi)件數量較多(duo),雙向信號(hao)(hao)損耗過(guo)大,來自信號(hao)(hao)源(下行(xing))或來自天線(xian)(xian)(上(shang)行(xing))的(de)(de)(de)信號(hao)(hao)強度偏(pian)低(di),相關指標將不(bu)能滿足設計的(de)(de)(de)技術要求,將直接影(ying)響到室內天線(xian)(xian)的(de)(de)(de)端(duan)口發(fa)射功(gong)率和(he)基站接收機(中(zhong)繼臺))的(de)(de)(de)端(duan)口的(de)(de)(de)接收功(gong)率,這就(jiu)必須在主(zhu)干線(xian)(xian)纜傳(chuan)輸鏈路中(zhong)的(de)(de)(de)適(shi)當(dang)位置增加(jia)干線(xian)(xian)放(fang)大器(qi)(qi)設備(bei)。
干線(xian)放(fang)大(da)(da)器具有(you)雙(shuang)向信(xin)(xin)號(hao)放(fang)大(da)(da)功能,上(shang)行(xing)(xing)/下行(xing)(xing)信(xin)(xin)號(hao)處理及放(fang)大(da)(da)電路獨(du)立(li)分(fen)開,上(shang)行(xing)(xing)/下行(xing)(xing)放(fang)大(da)(da)功率可單獨(du)調節,可根據實際要求(qiu)進行(xing)(xing)現(xian)場(chang)測驗后對上(shang)行(xing)(xing)/下行(xing)(xing)信(xin)(xin)號(hao)增益(yi)進行(xing)(xing)分(fen)別設置,這樣極大(da)(da)地(di)方便了(le)系統調試,從而更有(you)效地(di)保(bao)證了(le)系統的安全穩定性和建筑物內電磁(ci)環境滿(man)足國家有(you)關(guan)標準。