由(you)于在(zai)(zai)戶外(wai)(wai)(wai)、室內等(deng)區域，無線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)(xi)(xi)(xi)統(tong)的(de)(de)信號強度較(jiao)弱(ruo)，而且采用頻率(lv)調制技(ji)術（如 MHZ、 NMR、 BSI等(deng)）產生的(de)(de)信號傳輸(shu)時(shi)延大(da)，傳輸(shu)距(ju)(ju)離(li)遠。因(yin)此(ci)有(you)線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)(xi)(xi)(xi)統(tong)不(bu)適合在(zai)(zai)戶外(wai)(wai)(wai)環境(jing)使(shi)(shi)用，特別(bie)是(shi)在(zai)(zai)冬(dong)天及(ji)低風速季節使(shi)(shi)用。雖(sui)然無線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)(xi)(xi)(xi)統(tong)也有(you)著(zhu)不(bu)錯(cuo)的(de)(de)效果。但由(you)于系(xi)(xi)(xi)(xi)(xi)統(tong)工作時(shi)會有(you)一(yi)(yi)定(ding)的(de)(de)干(gan)擾，使(shi)(shi)對(dui)講(jiang)(jiang)效果下降，另外(wai)(wai)(wai)在(zai)(zai)信號較(jiao)弱(ruo)時(shi)對(dui)用戶語音(yin)產生了影響。特別(bie)是(shi)在(zai)(zai)人員復雜、通信距(ju)(ju)離(li)較(jiao)短(duan)或(huo)需(xu)要(yao)較(jiao)長時(shi)間使(shi)(shi)用時(shi)。因(yin)此(ci)，更(geng)需(xu)要(yao)有(you)一(yi)(yi)個可(ke)靠(kao)的(de)(de)無線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)(xi)(xi)(xi)統(tong)提(ti)供與(yu)有(you)線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)(xi)(xi)(xi)統(tong)一(yi)(yi)樣(yang)的(de)(de)語音(yin)信息與(yu)控制。無線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)(xi)(xi)(xi)統(tong)具有(you)很高的(de)(de)靈活性，它(ta)能夠滿足現場中所有(you)環境(jing)使(shi)(shi)用需(xu)求并能隨時(shi)切換（如在(zai)(zai)野外(wai)(wai)(wai)、戶外(wai)(wai)(wai)電(dian)話等(deng)),用戶可(ke)以在(zai)(zai)任(ren)何地(di)點(dian)使(shi)(shi)用、隨時(shi)、隨地(di)進行通訊(xun)。使(shi)(shi)用方便(bian)、節省成本、節約費(fei)用。下面我(wo)們來(lai)了解(jie)一(yi)(yi)下無線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)(xi)(xi)(xi)統(tong)它(ta)主要(yao)是(shi)什么優點(dian)？

1.性能穩定(ding)，可靠性高

在(zai)相(xiang)同無線(xian)傳(chuan)輸距離下(xia)，無線(xian)傳(chuan)輸信號(hao)更穩定由于(yu)使(shi)用(yong)了功率放大器來對(dui)無線(xian)信號(hao)進行壓縮和放大，使(shi)無線(xian)信號(hao)更加穩定可靠。無線(xian)信號(hao)在(zai)弱電(dian)磁環境下(xia)也(ye)能(neng)保(bao)持(chi)較(jiao)好的性(xing)能(neng)。無線(xian)對(dui)講系統(tong)具(ju)有(you)發(fa)射(she)功率小、抗千(qian)擾(rao)(rao)能(neng)力強(qiang)(與有(you)線(xian)對(dui)講系統(tong)比較(jiao))和抗電(dian)磁干擾(rao)(rao)能(neng)力強(qiang)(與有(you)線(xian)對(dui)講系統(tong)比較(jiao))的特點(dian)。無線(xian)對(dui)講系統(tong)發(fa)射(she)信號(hao)在(zai)發(fa)射(she)前和發(fa)射(she)后均(jun)能(neng)保(bao)持(chi)良(liang)好的性(xing)能(neng)，使(shi)用(yong)過程(cheng)中(zhong)，發(fa)射(she)信號(hao)與接收信號(hao)完全不受(shou)任何千(qian)擾(rao)(rao)，可保(bao)持(chi)很好的穩定性(xing)，具(ju)有(you)良(liang)好的抗千(qian)擾(rao)(rao)性(xing)和抗低(di)頻干擾(rao)(rao)能(neng)力，即使(shi)在(zai)惡劣的環境下(xia)也(ye)能(neng)保(bao)持(chi)較(jiao)好的性(xing)能(neng)。因此無線(xian)系統(tong)有(you)較(jiao)高的可靠性(xing)。

2.功耗小(xiao)、不受天(tian)氣、濕度的(de)影響(xiang)

無(wu)(wu)線(xian)(xian)對(dui)講系統在不(bu)同(tong)的(de)(de)(de)環境(jing)(jing)(jing)中，無(wu)(wu)線(xian)(xian)通信(xin)設(she)備(bei)和有(you)線(xian)(xian)通信(xin)設(she)備(bei)一樣都(dou)要進行電能的(de)(de)(de)消耗(hao)(hao)。當(dang)環境(jing)(jing)(jing)溫度在-40°C以(yi)下(xia)時(shi)(shi)，無(wu)(wu)線(xian)(xian)通信(xin)設(she)備(bei)需要每(mei)天(tian)工(gong)(gong)(gong)(gong)作8小(xiao)(xiao)時(shi)(shi)左(zuo)右;當(dang)環境(jing)(jing)(jing)溫度為-20°C時(shi)(shi)，每(mei)天(tian)工(gong)(gong)(gong)(gong)作8小(xiao)(xiao)時(shi)(shi)左(zuo)右;當(dang)環境(jing)(jing)(jing)溫度為-30°C時(shi)(shi)，每(mei)天(tian)工(gong)(gong)(gong)(gong)作4小(xiao)(xiao)時(shi)(shi)左(zuo)右。目前市場上常(chang)見的(de)(de)(de)無(wu)(wu)線(xian)(xian)對(dui)講系統有(you)兩種(zhong)電源輸(shu)入(ru)方式，一種(zhong)是電源輸(shu)入(ru)，另一種(zhong)是電源輸(shu)出(chu)。從這兩種(zhong)方式對(dui)系統的(de)(de)(de)功耗(hao)(hao)來看，電源輸(shu)入(ru)方式的(de)(de)(de)功耗(hao)(hao)更大一些(xie)，但是功耗(hao)(hao)很小(xiao)(xiao)。并且設(she)備(bei)的(de)(de)(de)工(gong)(gong)(gong)(gong)作環境(jing)(jing)(jing)不(bu)同(tong)，對(dui)電池的(de)(de)(de)需求量也不(bu)同(tong)，所以(yi)功耗(hao)(hao)也不(bu)同(tong)。

3信號不受干擾

在(zai)(zai)一(yi)(yi)些有干(gan)(gan)擾(rao)(rao)(rao)(rao)(rao)的(de)(de)(de)地方(fang)，例如野(ye)外(wai)、機場、工(gong)廠(chang)等(deng)，一(yi)(yi)般采(cai)(cai)用(yong)(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)方(fang)式。分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)方(fang)式的(de)(de)(de)抗干(gan)(gan)擾(rao)(rao)(rao)(rao)(rao)能(neng)力不(bu)(bu)強，其(qi)(qi)抗干(gan)(gan)擾(rao)(rao)(rao)(rao)(rao)能(neng)力主(zhu)要(yao)取決于射頻(pin)(pin)(pin)(pin)(pin)功(gong)(gong)(gong)率(lv)的(de)(de)(de)大小(xiao)。分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)(ji)術的(de)(de)(de)功(gong)(gong)(gong)率(lv)一(yi)(yi)般是50dB在(zai)(zai)50dB左右時(shi)，其(qi)(qi)抗干(gan)(gan)擾(rao)(rao)(rao)(rao)(rao)能(neng)力強。但(dan)由于分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)的(de)(de)(de)干(gan)(gan)擾(rao)(rao)(rao)(rao)(rao)與噪聲(主(zhu)要(yao)是周邊噪聲)具有很(hen)強的(de)(de)(de)互通性，當分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)發(fa)(fa)(fa)射的(de)(de)(de)信(xin)(xin)號(hao)(hao)超過50dB時(shi)，其(qi)(qi)抗千(qian)擾(rao)(rao)(rao)(rao)(rao)能(neng)力就會(hui)減弱。另外(wai)，在(zai)(zai)一(yi)(yi)些有噪音的(de)(de)(de)環(huan)境中使(shi)用(yong)(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)(ji)術，會(hui)使(shi)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)信(xin)(xin)號(hao)(hao)無(wu)(wu)法到(dao)達發(fa)(fa)(fa)射端(duan)的(de)(de)(de)接收(shou)(shou)機或者(zhe)造(zao)成發(fa)(fa)(fa)射端(duan)信(xin)(xin)號(hao)(hao)與接收(shou)(shou)端(duan)信(xin)(xin)號(hao)(hao)的(de)(de)(de)糟合而造(zao)成分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)或干(gan)(gan)擾(rao)(rao)(rao)(rao)(rao)(例如在(zai)(zai)使(shi)用(yong)(yong)(yong)室外(wai)電話時(shi)) 。而采(cai)(cai)用(yong)(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)(ji)術的(de)(de)(de)無(wu)(wu)線(xian)(xian)對講系統由于發(fa)(fa)(fa)射功(gong)(gong)(gong)率(lv)小(xiao)，分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)后的(de)(de)(de)信(xin)(xin)號(hao)(hao)強度(du)比有線(xian)(xian)對講系統高很(hen)多(在(zai)(zai)實(shi)際(ji)使(shi)用(yong)(yong)(yong)中分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)設備一(yi)(yi)般可以(yi)將(jiang)系統信(xin)(xin)號(hao)(hao)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)到(dao)50dB以(yi)上(shang)),信(xin)(xin)號(hao)(hao)不(bu)(bu)受干(gan)(gan)擾(rao)(rao)(rao)(rao)(rao)。如果采(cai)(cai)用(yong)(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)(ji)術，需要(yao)在(zai)(zai)較(jiao)大的(de)(de)(de)回(hui)波功(gong)(gong)(gong)率(lv)下(xia)才能(neng)實(shi)現(xian)信(xin)(xin)號(hao)(hao)的(de)(de)(de)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)工(gong)作(如分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)器發(fa)(fa)(fa)射信(xin)(xin)號(hao)(hao)與接收(shou)(shou)信(xin)(xin)號(hao)(hao)重疊時(shi)產生的(de)(de)(de)千(qian)擾(rao)(rao)(rao)(rao)(rao))和發(fa)(fa)(fa)送(song)信(xin)(xin)號(hao)(hao)強度(du)降(jiang)(jiang)低(同頻(pin)(pin)(pin)(pin)(pin)帶內的(de)(de)(de)兩只(zhi)天(tian)線(xian)(xian)對同一(yi)(yi)信(xin)(xin)道(dao)傳輸(shu)的(de)(de)(de)信(xin)(xin)號(hao)(hao)強度(du)基本一(yi)(yi)致);如果采(cai)(cai)用(yong)(yong)(yong)混(hun)響技(ji)(ji)術，則可以(yi)實(shi)現(xian)對無(wu)(wu)線(xian)(xian)信(xin)(xin)號(hao)(hao)干(gan)(gan)擾(rao)(rao)(rao)(rao)(rao)的(de)(de)(de)抑(yi)制或降(jiang)(jiang)低。