由于在(zai)戶(hu)外(wai)、室內等(deng)區域，無(wu)線(xian)(xian)(xian)對(dui)講系(xi)(xi)(xi)統(tong)(tong)(tong)的(de)信(xin)號強度(du)較(jiao)(jiao)弱，而且(qie)采(cai)用(yong)(yong)(yong)(yong)(yong)頻率調(diao)制(zhi)技(ji)術（如(ru) MHZ、 NMR、 BSI等(deng)）產生(sheng)的(de)信(xin)號傳輸(shu)時(shi)延(yan)大，傳輸(shu)距(ju)(ju)離遠。因(yin)此(ci)有(you)(you)(you)線(xian)(xian)(xian)對(dui)講系(xi)(xi)(xi)統(tong)(tong)(tong)不(bu)適合在(zai)戶(hu)外(wai)環境(jing)使用(yong)(yong)(yong)(yong)(yong)，特別是在(zai)冬(dong)天及低風速季節(jie)使用(yong)(yong)(yong)(yong)(yong)。雖然無(wu)線(xian)(xian)(xian)對(dui)講系(xi)(xi)(xi)統(tong)(tong)(tong)也有(you)(you)(you)著不(bu)錯的(de)效(xiao)果(guo)。但由于系(xi)(xi)(xi)統(tong)(tong)(tong)工(gong)作時(shi)會有(you)(you)(you)一(yi)定的(de)干(gan)擾，使對(dui)講效(xiao)果(guo)下(xia)降，另外(wai)在(zai)信(xin)號較(jiao)(jiao)弱時(shi)對(dui)用(yong)(yong)(yong)(yong)(yong)戶(hu)語音產生(sheng)了(le)影響。特別是在(zai)人員復雜(za)、通信(xin)距(ju)(ju)離較(jiao)(jiao)短或需要較(jiao)(jiao)長時(shi)間使用(yong)(yong)(yong)(yong)(yong)時(shi)。因(yin)此(ci)，更需要有(you)(you)(you)一(yi)個可(ke)靠的(de)無(wu)線(xian)(xian)(xian)對(dui)講系(xi)(xi)(xi)統(tong)(tong)(tong)提供與有(you)(you)(you)線(xian)(xian)(xian)對(dui)講系(xi)(xi)(xi)統(tong)(tong)(tong)一(yi)樣的(de)語音信(xin)息與控制(zhi)。無(wu)線(xian)(xian)(xian)對(dui)講系(xi)(xi)(xi)統(tong)(tong)(tong)具有(you)(you)(you)很高的(de)靈(ling)活(huo)性，它能夠滿(man)足現場中所有(you)(you)(you)環境(jing)使用(yong)(yong)(yong)(yong)(yong)需求(qiu)并能隨時(shi)切換（如(ru)在(zai)野(ye)外(wai)、戶(hu)外(wai)電(dian)話等(deng)),用(yong)(yong)(yong)(yong)(yong)戶(hu)可(ke)以在(zai)任何地點使用(yong)(yong)(yong)(yong)(yong)、隨時(shi)、隨地進行(xing)通訊。使用(yong)(yong)(yong)(yong)(yong)方便(bian)、節(jie)省(sheng)成本、節(jie)約(yue)費用(yong)(yong)(yong)(yong)(yong)。下(xia)面我們來了(le)解(jie)一(yi)下(xia)無(wu)線(xian)(xian)(xian)對(dui)講系(xi)(xi)(xi)統(tong)(tong)(tong)它主要是什么優點？

1.性能穩定，可靠性高

在(zai)(zai)相同無(wu)線(xian)(xian)傳(chuan)輸(shu)距離下，無(wu)線(xian)(xian)傳(chuan)輸(shu)信(xin)(xin)號(hao)(hao)(hao)更穩定由于(yu)使(shi)用(yong)了(le)功率放大器(qi)來對(dui)無(wu)線(xian)(xian)信(xin)(xin)號(hao)(hao)(hao)進行壓(ya)縮和放大，使(shi)無(wu)線(xian)(xian)信(xin)(xin)號(hao)(hao)(hao)更加穩定可靠(kao)。無(wu)線(xian)(xian)信(xin)(xin)號(hao)(hao)(hao)在(zai)(zai)弱電(dian)磁環(huan)境(jing)下也能保持(chi)較(jiao)好(hao)的性(xing)能。無(wu)線(xian)(xian)對(dui)講(jiang)系(xi)統(tong)具有(you)(you)發(fa)(fa)(fa)射(she)(she)功率小、抗千擾(rao)(rao)(rao)(rao)能力強(qiang)(與有(you)(you)線(xian)(xian)對(dui)講(jiang)系(xi)統(tong)比(bi)較(jiao))和抗電(dian)磁干擾(rao)(rao)(rao)(rao)能力強(qiang)(與有(you)(you)線(xian)(xian)對(dui)講(jiang)系(xi)統(tong)比(bi)較(jiao))的特點。無(wu)線(xian)(xian)對(dui)講(jiang)系(xi)統(tong)發(fa)(fa)(fa)射(she)(she)信(xin)(xin)號(hao)(hao)(hao)在(zai)(zai)發(fa)(fa)(fa)射(she)(she)前(qian)和發(fa)(fa)(fa)射(she)(she)后均(jun)能保持(chi)良(liang)好(hao)的性(xing)能，使(shi)用(yong)過(guo)程中，發(fa)(fa)(fa)射(she)(she)信(xin)(xin)號(hao)(hao)(hao)與接收信(xin)(xin)號(hao)(hao)(hao)完全(quan)不受任何千擾(rao)(rao)(rao)(rao)，可保持(chi)很好(hao)的穩定性(xing)，具有(you)(you)良(liang)好(hao)的抗千擾(rao)(rao)(rao)(rao)性(xing)和抗低頻干擾(rao)(rao)(rao)(rao)能力，即使(shi)在(zai)(zai)惡劣的環(huan)境(jing)下也能保持(chi)較(jiao)好(hao)的性(xing)能。因此無(wu)線(xian)(xian)系(xi)統(tong)有(you)(you)較(jiao)高的可靠(kao)性(xing)。

2.功耗小、不受天氣、濕度的(de)影響

無(wu)線(xian)對講系統在不(bu)同的(de)(de)環境(jing)中，無(wu)線(xian)通(tong)信設備和有線(xian)通(tong)信設備一(yi)樣都要(yao)進行(xing)電(dian)(dian)能的(de)(de)消(xiao)耗。當(dang)環境(jing)溫度在-40°C以下時(shi)(shi)，無(wu)線(xian)通(tong)信設備需要(yao)每天(tian)(tian)工作8小時(shi)(shi)左(zuo)右(you);當(dang)環境(jing)溫度為-20°C時(shi)(shi)，每天(tian)(tian)工作8小時(shi)(shi)左(zuo)右(you);當(dang)環境(jing)溫度為-30°C時(shi)(shi)，每天(tian)(tian)工作4小時(shi)(shi)左(zuo)右(you)。目前市場上常見的(de)(de)無(wu)線(xian)對講系統有兩種電(dian)(dian)源(yuan)輸(shu)(shu)入(ru)方(fang)式(shi)(shi)，一(yi)種是電(dian)(dian)源(yuan)輸(shu)(shu)入(ru)，另一(yi)種是電(dian)(dian)源(yuan)輸(shu)(shu)出(chu)。從這兩種方(fang)式(shi)(shi)對系統的(de)(de)功(gong)耗來看，電(dian)(dian)源(yuan)輸(shu)(shu)入(ru)方(fang)式(shi)(shi)的(de)(de)功(gong)耗更大(da)一(yi)些，但是功(gong)耗很小。并且設備的(de)(de)工作環境(jing)不(bu)同，對電(dian)(dian)池的(de)(de)需求量也(ye)(ye)不(bu)同，所(suo)以功(gong)耗也(ye)(ye)不(bu)同。

3信號不受干擾

在(zai)一些有(you)(you)干(gan)擾(rao)的(de)(de)地方(fang)，例如野外(wai)、機場、工廠等，一般(ban)采用(yong)分頻(pin)(pin)方(fang)式(shi)。分頻(pin)(pin)方(fang)式(shi)的(de)(de)抗(kang)干(gan)擾(rao)能力(li)不(bu)強(qiang)(qiang)，其抗(kang)干(gan)擾(rao)能力(li)主要(yao)取決于射(she)頻(pin)(pin)功率的(de)(de)大小。分頻(pin)(pin)技(ji)(ji)(ji)術(shu)的(de)(de)功率一般(ban)是50dB在(zai)50dB左右時(shi)，其抗(kang)干(gan)擾(rao)能力(li)強(qiang)(qiang)。但由于分頻(pin)(pin)的(de)(de)干(gan)擾(rao)與(yu)噪(zao)(zao)聲(主要(yao)是周(zhou)邊噪(zao)(zao)聲)具(ju)有(you)(you)很強(qiang)(qiang)的(de)(de)互通性，當分頻(pin)(pin)發(fa)射(she)的(de)(de)信(xin)(xin)(xin)號(hao)(hao)超過50dB時(shi)，其抗(kang)千(qian)擾(rao)能力(li)就會(hui)減弱(ruo)。另外(wai)，在(zai)一些有(you)(you)噪(zao)(zao)音的(de)(de)環境中使用(yong)分頻(pin)(pin)技(ji)(ji)(ji)術(shu)，會(hui)使分頻(pin)(pin)信(xin)(xin)(xin)號(hao)(hao)無(wu)法(fa)到(dao)達發(fa)射(she)端(duan)的(de)(de)接收(shou)機或(huo)者(zhe)造(zao)成(cheng)發(fa)射(she)端(duan)信(xin)(xin)(xin)號(hao)(hao)與(yu)接收(shou)端(duan)信(xin)(xin)(xin)號(hao)(hao)的(de)(de)糟合(he)而(er)(er)造(zao)成(cheng)分頻(pin)(pin)或(huo)干(gan)擾(rao)(例如在(zai)使用(yong)室外(wai)電話時(shi)) 。而(er)(er)采用(yong)分頻(pin)(pin)技(ji)(ji)(ji)術(shu)的(de)(de)無(wu)線對講系統(tong)由于發(fa)射(she)功率小，分頻(pin)(pin)后的(de)(de)信(xin)(xin)(xin)號(hao)(hao)強(qiang)(qiang)度比有(you)(you)線對講系統(tong)高很多(在(zai)實(shi)(shi)際使用(yong)中分頻(pin)(pin)設備(bei)一般(ban)可以(yi)將系統(tong)信(xin)(xin)(xin)號(hao)(hao)分頻(pin)(pin)到(dao)50dB以(yi)上),信(xin)(xin)(xin)號(hao)(hao)不(bu)受干(gan)擾(rao)。如果(guo)(guo)采用(yong)分頻(pin)(pin)技(ji)(ji)(ji)術(shu)，需要(yao)在(zai)較大的(de)(de)回波(bo)功率下才能實(shi)(shi)現信(xin)(xin)(xin)號(hao)(hao)的(de)(de)分頻(pin)(pin)工作(如分頻(pin)(pin)器發(fa)射(she)信(xin)(xin)(xin)號(hao)(hao)與(yu)接收(shou)信(xin)(xin)(xin)號(hao)(hao)重疊時(shi)產生的(de)(de)千(qian)擾(rao))和發(fa)送信(xin)(xin)(xin)號(hao)(hao)強(qiang)(qiang)度降(jiang)低(同頻(pin)(pin)帶內的(de)(de)兩只(zhi)天線對同一信(xin)(xin)(xin)道傳(chuan)輸的(de)(de)信(xin)(xin)(xin)號(hao)(hao)強(qiang)(qiang)度基本(ben)一致);如果(guo)(guo)采用(yong)混響技(ji)(ji)(ji)術(shu)，則可以(yi)實(shi)(shi)現對無(wu)線信(xin)(xin)(xin)號(hao)(hao)干(gan)擾(rao)的(de)(de)抑制或(huo)降(jiang)低。