干(gan)(gan)(gan)線(xian)放大(da)(da)器是(shi)主(zhu)干(gan)(gan)(gan)線(xian)纜傳(chuan)輸(shu)(shu)(shu)鏈(lian)(lian)路(lu)上(shang)的(de)(de)雙向信號處理放大(da)(da)設(she)備(bei)。當(dang)主(zhu)干(gan)(gan)(gan)線(xian)纜傳(chuan)輸(shu)(shu)(shu)距(ju)離長(chang)，或鏈(lian)(lian)路(lu)中(zhong)負載器件數(shu)量(liang)較(jiao)多，雙向信號損耗過大(da)(da)，來自信號源（下(xia)行(xing)(xing)）或來自天線(xian)（上(shang)行(xing)(xing)）的(de)(de)信號強度(du)偏低(di)，相關指標將不能滿(man)足設(she)計的(de)(de)技術要求，將直接(jie)影響到室(shi)內(nei)天線(xian)的(de)(de)端口發射功(gong)率和基站接(jie)收(shou)機（中(zhong)繼臺(tai))）的(de)(de)端口的(de)(de)接(jie)收(shou)功(gong)率，這(zhe)就必(bi)須在主(zhu)干(gan)(gan)(gan)線(xian)纜傳(chuan)輸(shu)(shu)(shu)鏈(lian)(lian)路(lu)中(zhong)的(de)(de)適(shi)當(dang)位置增加干(gan)(gan)(gan)線(xian)放大(da)(da)器設(she)備(bei)。

干線(xian)放大(da)器具有(you)雙(shuang)向信號(hao)放大(da)功(gong)能，上行(xing)(xing)(xing)/下行(xing)(xing)(xing)信號(hao)處理及(ji)放大(da)電(dian)路獨(du)立(li)分開，上行(xing)(xing)(xing)/下行(xing)(xing)(xing)放大(da)功(gong)率(lv)可單獨(du)調(diao)節，可根據實際(ji)要(yao)求進行(xing)(xing)(xing)現場測驗后對(dui)上行(xing)(xing)(xing)/下行(xing)(xing)(xing)信號(hao)增(zeng)益進行(xing)(xing)(xing)分別設置，這樣極(ji)大(da)地(di)方便了系統調(diao)試，從而更有(you)效地(di)保(bao)證了系統的(de)安全穩定性和建筑物內電(dian)磁(ci)環(huan)境滿(man)足(zu)國家有(you)關標(biao)準。