干線(xian)(xian)(xian)放大(da)(da)器(qi)是主(zhu)干線(xian)(xian)(xian)纜傳(chuan)輸(shu)鏈(lian)路上的(de)(de)雙向信(xin)(xin)號處(chu)理放大(da)(da)設備(bei)。當主(zhu)干線(xian)(xian)(xian)纜傳(chuan)輸(shu)距離長,或鏈(lian)路中負載器(qi)件(jian)數量較多,雙向信(xin)(xin)號損耗過大(da)(da),來自信(xin)(xin)號源(yuan)(下(xia)行(xing))或來自天(tian)線(xian)(xian)(xian)(上行(xing))的(de)(de)信(xin)(xin)號強度偏(pian)低,相關指(zhi)標將(jiang)不能(neng)滿足設計的(de)(de)技術要求,將(jiang)直接(jie)影(ying)響到室內(nei)天(tian)線(xian)(xian)(xian)的(de)(de)端口(kou)發射功率和(he)基站接(jie)收機(中繼臺))的(de)(de)端口(kou)的(de)(de)接(jie)收功率,這(zhe)就(jiu)必(bi)須在主(zhu)干線(xian)(xian)(xian)纜傳(chuan)輸(shu)鏈(lian)路中的(de)(de)適當位置增加(jia)干線(xian)(xian)(xian)放大(da)(da)器(qi)設備(bei)。干線(xian)(xian)(xian)放大(da)(da)器(qi)具有雙向信(xin)(xin)號放大(da)(da)功能(neng),上行(xing)/下(xia)行(xing)信(xin)(xin)號處(chu)理及放大(da)(da)電路
干線(xian)放大(da)器是主干線(xian)纜(lan)傳(chuan)輸(shu)鏈路上(shang)的(de)(de)雙向信(xin)號(hao)處理放大(da)設(she)(she)備(bei)。當(dang)主干線(xian)纜(lan)傳(chuan)輸(shu)距離長,或鏈路中(zhong)負載器件(jian)數(shu)量較多,雙向信(xin)號(hao)損(sun)耗過大(da),來(lai)自信(xin)號(hao)源(下行)或來(lai)自天線(xian)(上(shang)行)的(de)(de)信(xin)號(hao)強度偏低,相(xiang)關(guan)指(zhi)標將不能滿足設(she)(she)計的(de)(de)技術(shu)要求(qiu),將直接(jie)影(ying)響到室內天線(xian)的(de)(de)端(duan)口(kou)發射功率(lv)和基站接(jie)收(shou)機(ji)(中(zhong)繼臺))的(de)(de)端(duan)口(kou)的(de)(de)接(jie)收(shou)功率(lv),這(zhe)就必須在主干線(xian)纜(lan)傳(chuan)輸(shu)鏈路中(zhong)的(de)(de)適當(dang)位置增加干線(xian)放大(da)器設(she)(she)備(bei)。
干(gan)線(xian)放(fang)大(da)(da)(da)器(qi)具(ju)有(you)雙向(xiang)信號放(fang)大(da)(da)(da)功(gong)能,上(shang)(shang)行(xing)(xing)/下行(xing)(xing)信號處(chu)理及放(fang)大(da)(da)(da)電路獨(du)立(li)分開,上(shang)(shang)行(xing)(xing)/下行(xing)(xing)放(fang)大(da)(da)(da)功(gong)率可單(dan)獨(du)調(diao)節,可根據實際(ji)要求進行(xing)(xing)現場測驗后對上(shang)(shang)行(xing)(xing)/下行(xing)(xing)信號增益進行(xing)(xing)分別設置,這(zhe)樣極大(da)(da)(da)地方便了(le)系(xi)統調(diao)試,從而更有(you)效地保證了(le)系(xi)統的安全穩定(ding)性和(he)建筑物內電磁(ci)環境滿足國家有(you)關標準。