由于在(zai)戶外(wai)(wai)(wai)、室內等區域(yu)，無(wu)線(xian)對(dui)講(jiang)系(xi)(xi)統(tong)的(de)信號(hao)強度較弱(ruo)，而且采用(yong)(yong)(yong)(yong)頻率調制技術（如(ru)(ru) MHZ、 NMR、 BSI等）產生的(de)信號(hao)傳輸(shu)時(shi)延大，傳輸(shu)距離遠。因(yin)此有(you)線(xian)對(dui)講(jiang)系(xi)(xi)統(tong)不適合在(zai)戶外(wai)(wai)(wai)環境使(shi)用(yong)(yong)(yong)(yong)，特(te)別(bie)是(shi)在(zai)冬天及低風速季節(jie)(jie)使(shi)用(yong)(yong)(yong)(yong)。雖然無(wu)線(xian)對(dui)講(jiang)系(xi)(xi)統(tong)也有(you)著不錯的(de)效(xiao)果(guo)。但由于系(xi)(xi)統(tong)工作(zuo)時(shi)會(hui)有(you)一定的(de)干擾，使(shi)對(dui)講(jiang)效(xiao)果(guo)下降，另(ling)外(wai)(wai)(wai)在(zai)信號(hao)較弱(ruo)時(shi)對(dui)用(yong)(yong)(yong)(yong)戶語音產生了影(ying)響。特(te)別(bie)是(shi)在(zai)人員復雜、通信距離較短或需要較長時(shi)間(jian)使(shi)用(yong)(yong)(yong)(yong)時(shi)。因(yin)此，更(geng)需要有(you)一個(ge)可(ke)靠的(de)無(wu)線(xian)對(dui)講(jiang)系(xi)(xi)統(tong)提供與有(you)線(xian)對(dui)講(jiang)系(xi)(xi)統(tong)一樣(yang)的(de)語音信息(xi)與控制。無(wu)線(xian)對(dui)講(jiang)系(xi)(xi)統(tong)具有(you)很高的(de)靈(ling)活性，它能夠(gou)滿足現(xian)場中所有(you)環境使(shi)用(yong)(yong)(yong)(yong)需求并能隨時(shi)切換(huan)（如(ru)(ru)在(zai)野外(wai)(wai)(wai)、戶外(wai)(wai)(wai)電(dian)話等),用(yong)(yong)(yong)(yong)戶可(ke)以在(zai)任何地(di)點使(shi)用(yong)(yong)(yong)(yong)、隨時(shi)、隨地(di)進行通訊。使(shi)用(yong)(yong)(yong)(yong)方便、節(jie)(jie)省成本(ben)、節(jie)(jie)約費用(yong)(yong)(yong)(yong)。下面我們(men)來了解(jie)一下無(wu)線(xian)對(dui)講(jiang)系(xi)(xi)統(tong)它主要是(shi)什么優點？

1.性(xing)能穩定，可靠性(xing)高

在相(xiang)同無(wu)線(xian)(xian)傳輸距離下(xia)，無(wu)線(xian)(xian)傳輸信(xin)號(hao)更穩定由于使(shi)(shi)用了功率(lv)(lv)放(fang)大器(qi)來對(dui)無(wu)線(xian)(xian)信(xin)號(hao)進行壓縮和放(fang)大，使(shi)(shi)無(wu)線(xian)(xian)信(xin)號(hao)更加穩定可靠。無(wu)線(xian)(xian)信(xin)號(hao)在弱電(dian)磁(ci)環(huan)境下(xia)也能(neng)(neng)(neng)保持較(jiao)好(hao)(hao)的(de)(de)性(xing)(xing)能(neng)(neng)(neng)。無(wu)線(xian)(xian)對(dui)講系統(tong)具(ju)有(you)(you)發射(she)功率(lv)(lv)小、抗(kang)千擾能(neng)(neng)(neng)力強(與有(you)(you)線(xian)(xian)對(dui)講系統(tong)比較(jiao))和抗(kang)電(dian)磁(ci)干擾能(neng)(neng)(neng)力強(與有(you)(you)線(xian)(xian)對(dui)講系統(tong)比較(jiao))的(de)(de)特點。無(wu)線(xian)(xian)對(dui)講系統(tong)發射(she)信(xin)號(hao)在發射(she)前(qian)和發射(she)后均能(neng)(neng)(neng)保持良(liang)好(hao)(hao)的(de)(de)性(xing)(xing)能(neng)(neng)(neng)，使(shi)(shi)用過程中(zhong)，發射(she)信(xin)號(hao)與接收信(xin)號(hao)完全不受任何千擾，可保持很好(hao)(hao)的(de)(de)穩定性(xing)(xing)，具(ju)有(you)(you)良(liang)好(hao)(hao)的(de)(de)抗(kang)千擾性(xing)(xing)和抗(kang)低(di)頻干擾能(neng)(neng)(neng)力，即使(shi)(shi)在惡(e)劣的(de)(de)環(huan)境下(xia)也能(neng)(neng)(neng)保持較(jiao)好(hao)(hao)的(de)(de)性(xing)(xing)能(neng)(neng)(neng)。因此無(wu)線(xian)(xian)系統(tong)有(you)(you)較(jiao)高的(de)(de)可靠性(xing)(xing)。

2.功耗小、不受天氣、濕度的(de)影響

無(wu)線(xian)對(dui)講(jiang)系(xi)統在不(bu)(bu)同(tong)(tong)的(de)(de)環境(jing)(jing)中，無(wu)線(xian)通信設(she)備和有線(xian)通信設(she)備一樣都要進行電(dian)能的(de)(de)消耗(hao)。當環境(jing)(jing)溫度在-40°C以下時(shi)(shi)，無(wu)線(xian)通信設(she)備需要每天(tian)工作8小時(shi)(shi)左(zuo)右(you);當環境(jing)(jing)溫度為(wei)(wei)-20°C時(shi)(shi)，每天(tian)工作8小時(shi)(shi)左(zuo)右(you);當環境(jing)(jing)溫度為(wei)(wei)-30°C時(shi)(shi)，每天(tian)工作4小時(shi)(shi)左(zuo)右(you)。目前市場上(shang)常(chang)見的(de)(de)無(wu)線(xian)對(dui)講(jiang)系(xi)統有兩種電(dian)源(yuan)(yuan)(yuan)輸(shu)(shu)(shu)入(ru)方式(shi)，一種是電(dian)源(yuan)(yuan)(yuan)輸(shu)(shu)(shu)入(ru)，另一種是電(dian)源(yuan)(yuan)(yuan)輸(shu)(shu)(shu)出(chu)。從這兩種方式(shi)對(dui)系(xi)統的(de)(de)功(gong)(gong)耗(hao)來看(kan)，電(dian)源(yuan)(yuan)(yuan)輸(shu)(shu)(shu)入(ru)方式(shi)的(de)(de)功(gong)(gong)耗(hao)更大一些，但是功(gong)(gong)耗(hao)很小。并且設(she)備的(de)(de)工作環境(jing)(jing)不(bu)(bu)同(tong)(tong)，對(dui)電(dian)池的(de)(de)需求(qiu)量(liang)也不(bu)(bu)同(tong)(tong)，所(suo)以功(gong)(gong)耗(hao)也不(bu)(bu)同(tong)(tong)。

3信號不受干擾

在(zai)一些有(you)干(gan)(gan)擾(rao)(rao)的(de)地方(fang)，例如野外、機場(chang)、工廠等，一般(ban)采(cai)用(yong)(yong)(yong)分(fen)(fen)(fen)頻(pin)方(fang)式(shi)(shi)。分(fen)(fen)(fen)頻(pin)方(fang)式(shi)(shi)的(de)抗干(gan)(gan)擾(rao)(rao)能(neng)(neng)(neng)力(li)不強(qiang)(qiang)，其(qi)抗干(gan)(gan)擾(rao)(rao)能(neng)(neng)(neng)力(li)主要取(qu)決(jue)于(yu)射(she)頻(pin)功(gong)(gong)率(lv)的(de)大小。分(fen)(fen)(fen)頻(pin)技(ji)術的(de)功(gong)(gong)率(lv)一般(ban)是50dB在(zai)50dB左右(you)時(shi)，其(qi)抗干(gan)(gan)擾(rao)(rao)能(neng)(neng)(neng)力(li)強(qiang)(qiang)。但由于(yu)分(fen)(fen)(fen)頻(pin)的(de)干(gan)(gan)擾(rao)(rao)與(yu)噪聲(主要是周邊噪聲)具有(you)很強(qiang)(qiang)的(de)互通性，當(dang)分(fen)(fen)(fen)頻(pin)發(fa)射(she)的(de)信(xin)(xin)號(hao)(hao)超過50dB時(shi)，其(qi)抗千擾(rao)(rao)能(neng)(neng)(neng)力(li)就會減弱。另外，在(zai)一些有(you)噪音的(de)環(huan)境中使(shi)(shi)用(yong)(yong)(yong)分(fen)(fen)(fen)頻(pin)技(ji)術，會使(shi)(shi)分(fen)(fen)(fen)頻(pin)信(xin)(xin)號(hao)(hao)無(wu)法(fa)到達發(fa)射(she)端的(de)接收(shou)(shou)機或者造成(cheng)發(fa)射(she)端信(xin)(xin)號(hao)(hao)與(yu)接收(shou)(shou)端信(xin)(xin)號(hao)(hao)的(de)糟(zao)合而造成(cheng)分(fen)(fen)(fen)頻(pin)或干(gan)(gan)擾(rao)(rao)(例如在(zai)使(shi)(shi)用(yong)(yong)(yong)室外電話(hua)時(shi)) 。而采(cai)用(yong)(yong)(yong)分(fen)(fen)(fen)頻(pin)技(ji)術的(de)無(wu)線對(dui)講系統(tong)(tong)由于(yu)發(fa)射(she)功(gong)(gong)率(lv)小，分(fen)(fen)(fen)頻(pin)后(hou)的(de)信(xin)(xin)號(hao)(hao)強(qiang)(qiang)度(du)比(bi)有(you)線對(dui)講系統(tong)(tong)高很多(在(zai)實際使(shi)(shi)用(yong)(yong)(yong)中分(fen)(fen)(fen)頻(pin)設備一般(ban)可以(yi)將系統(tong)(tong)信(xin)(xin)號(hao)(hao)分(fen)(fen)(fen)頻(pin)到50dB以(yi)上),信(xin)(xin)號(hao)(hao)不受干(gan)(gan)擾(rao)(rao)。如果采(cai)用(yong)(yong)(yong)分(fen)(fen)(fen)頻(pin)技(ji)術，需(xu)要在(zai)較大的(de)回(hui)波功(gong)(gong)率(lv)下才能(neng)(neng)(neng)實現信(xin)(xin)號(hao)(hao)的(de)分(fen)(fen)(fen)頻(pin)工作(zuo)(如分(fen)(fen)(fen)頻(pin)器(qi)發(fa)射(she)信(xin)(xin)號(hao)(hao)與(yu)接收(shou)(shou)信(xin)(xin)號(hao)(hao)重疊時(shi)產生(sheng)的(de)千擾(rao)(rao))和(he)發(fa)送(song)信(xin)(xin)號(hao)(hao)強(qiang)(qiang)度(du)降(jiang)低(同(tong)頻(pin)帶內的(de)兩(liang)只(zhi)天線對(dui)同(tong)一信(xin)(xin)道傳輸的(de)信(xin)(xin)號(hao)(hao)強(qiang)(qiang)度(du)基本一致);如果采(cai)用(yong)(yong)(yong)混響(xiang)技(ji)術，則(ze)可以(yi)實現對(dui)無(wu)線信(xin)(xin)號(hao)(hao)干(gan)(gan)擾(rao)(rao)的(de)抑制或降(jiang)低。