由于在戶外(wai)、室內等區域，無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)的(de)(de)信號強度(du)較(jiao)弱，而且采用(yong)(yong)頻率調制(zhi)技術（如 MHZ、 NMR、 BSI等）產(chan)(chan)生的(de)(de)信號傳輸(shu)時(shi)延大，傳輸(shu)距(ju)離遠。因(yin)此(ci)有(you)線(xian)(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)不適(shi)合(he)在戶外(wai)環境(jing)使(shi)(shi)用(yong)(yong)，特別是在冬天(tian)及低(di)風速季節(jie)使(shi)(shi)用(yong)(yong)。雖然(ran)無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)也(ye)有(you)著(zhu)不錯的(de)(de)效(xiao)果。但(dan)由于系(xi)統(tong)(tong)(tong)工(gong)作時(shi)會有(you)一定(ding)的(de)(de)干(gan)擾(rao)，使(shi)(shi)對(dui)(dui)(dui)(dui)講(jiang)(jiang)(jiang)效(xiao)果下(xia)(xia)降，另外(wai)在信號較(jiao)弱時(shi)對(dui)(dui)(dui)(dui)用(yong)(yong)戶語(yu)音產(chan)(chan)生了影(ying)響。特別是在人員(yuan)復(fu)雜、通(tong)信距(ju)離較(jiao)短或需要較(jiao)長時(shi)間使(shi)(shi)用(yong)(yong)時(shi)。因(yin)此(ci)，更需要有(you)一個可(ke)靠的(de)(de)無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)提供與有(you)線(xian)(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)一樣的(de)(de)語(yu)音信息與控制(zhi)。無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)具有(you)很高的(de)(de)靈活性，它能夠滿(man)足現場(chang)中所(suo)有(you)環境(jing)使(shi)(shi)用(yong)(yong)需求并能隨(sui)(sui)時(shi)切換（如在野外(wai)、戶外(wai)電話等),用(yong)(yong)戶可(ke)以在任何地點(dian)使(shi)(shi)用(yong)(yong)、隨(sui)(sui)時(shi)、隨(sui)(sui)地進行(xing)通(tong)訊(xun)。使(shi)(shi)用(yong)(yong)方便(bian)、節(jie)省成本、節(jie)約費(fei)用(yong)(yong)。下(xia)(xia)面我們(men)來(lai)了解一下(xia)(xia)無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)它主要是什么優點(dian)？

1.性能穩(wen)定，可(ke)靠(kao)性高(gao)

在相同(tong)無(wu)(wu)(wu)線(xian)(xian)(xian)(xian)傳輸距離(li)下，無(wu)(wu)(wu)線(xian)(xian)(xian)(xian)傳輸信號(hao)(hao)(hao)更穩(wen)定由于(yu)使用了功率放大器(qi)來對(dui)無(wu)(wu)(wu)線(xian)(xian)(xian)(xian)信號(hao)(hao)(hao)進行壓縮和放大，使無(wu)(wu)(wu)線(xian)(xian)(xian)(xian)信號(hao)(hao)(hao)更加穩(wen)定可(ke)靠(kao)。無(wu)(wu)(wu)線(xian)(xian)(xian)(xian)信號(hao)(hao)(hao)在弱電(dian)磁(ci)環境下也能保持較(jiao)好(hao)(hao)的(de)性(xing)能。無(wu)(wu)(wu)線(xian)(xian)(xian)(xian)對(dui)講(jiang)系(xi)(xi)統(tong)具(ju)有發射功率小、抗千(qian)擾能力(li)強(與有線(xian)(xian)(xian)(xian)對(dui)講(jiang)系(xi)(xi)統(tong)比較(jiao))和抗電(dian)磁(ci)干擾能力(li)強(與有線(xian)(xian)(xian)(xian)對(dui)講(jiang)系(xi)(xi)統(tong)比較(jiao))的(de)特點。無(wu)(wu)(wu)線(xian)(xian)(xian)(xian)對(dui)講(jiang)系(xi)(xi)統(tong)發射信號(hao)(hao)(hao)在發射前和發射后均(jun)能保持良(liang)好(hao)(hao)的(de)性(xing)能，使用過程中，發射信號(hao)(hao)(hao)與接收(shou)信號(hao)(hao)(hao)完(wan)全不受任何千(qian)擾，可(ke)保持很(hen)好(hao)(hao)的(de)穩(wen)定性(xing)，具(ju)有良(liang)好(hao)(hao)的(de)抗千(qian)擾性(xing)和抗低頻干擾能力(li)，即使在惡劣(lie)的(de)環境下也能保持較(jiao)好(hao)(hao)的(de)性(xing)能。因此(ci)無(wu)(wu)(wu)線(xian)(xian)(xian)(xian)系(xi)(xi)統(tong)有較(jiao)高的(de)可(ke)靠(kao)性(xing)。

2.功(gong)耗小、不受天氣、濕(shi)度的影響

無(wu)線(xian)對講系統(tong)在不(bu)(bu)同(tong)的環(huan)境中，無(wu)線(xian)通(tong)(tong)信設備(bei)和(he)有(you)線(xian)通(tong)(tong)信設備(bei)一樣都要進行電(dian)能的消(xiao)耗。當(dang)(dang)環(huan)境溫度在-40°C以下時(shi)(shi)(shi)，無(wu)線(xian)通(tong)(tong)信設備(bei)需(xu)(xu)要每(mei)天(tian)工作8小時(shi)(shi)(shi)左(zuo)右(you);當(dang)(dang)環(huan)境溫度為-20°C時(shi)(shi)(shi)，每(mei)天(tian)工作8小時(shi)(shi)(shi)左(zuo)右(you);當(dang)(dang)環(huan)境溫度為-30°C時(shi)(shi)(shi)，每(mei)天(tian)工作4小時(shi)(shi)(shi)左(zuo)右(you)。目前市(shi)場上(shang)常(chang)見的無(wu)線(xian)對講系統(tong)有(you)兩種(zhong)電(dian)源(yuan)輸(shu)入(ru)方式(shi)，一種(zhong)是(shi)電(dian)源(yuan)輸(shu)入(ru)，另(ling)一種(zhong)是(shi)電(dian)源(yuan)輸(shu)出。從(cong)這兩種(zhong)方式(shi)對系統(tong)的功(gong)(gong)耗來看，電(dian)源(yuan)輸(shu)入(ru)方式(shi)的功(gong)(gong)耗更大一些，但(dan)是(shi)功(gong)(gong)耗很小。并且(qie)設備(bei)的工作環(huan)境不(bu)(bu)同(tong)，對電(dian)池的需(xu)(xu)求量(liang)也(ye)不(bu)(bu)同(tong)，所以功(gong)(gong)耗也(ye)不(bu)(bu)同(tong)。

3信號不受干擾

在一(yi)些有(you)(you)干(gan)(gan)(gan)擾(rao)(rao)的(de)(de)(de)(de)(de)地方，例(li)如野外(wai)、機場、工廠等，一(yi)般采用分(fen)(fen)(fen)頻(pin)(pin)方式。分(fen)(fen)(fen)頻(pin)(pin)方式的(de)(de)(de)(de)(de)抗干(gan)(gan)(gan)擾(rao)(rao)能(neng)力(li)(li)(li)不(bu)強(qiang)，其(qi)(qi)(qi)抗干(gan)(gan)(gan)擾(rao)(rao)能(neng)力(li)(li)(li)主要取決于(yu)射頻(pin)(pin)功率(lv)(lv)的(de)(de)(de)(de)(de)大(da)小。分(fen)(fen)(fen)頻(pin)(pin)技術的(de)(de)(de)(de)(de)功率(lv)(lv)一(yi)般是50dB在50dB左右時(shi)(shi)，其(qi)(qi)(qi)抗干(gan)(gan)(gan)擾(rao)(rao)能(neng)力(li)(li)(li)強(qiang)。但由于(yu)分(fen)(fen)(fen)頻(pin)(pin)的(de)(de)(de)(de)(de)干(gan)(gan)(gan)擾(rao)(rao)與(yu)噪聲(主要是周邊(bian)噪聲)具有(you)(you)很強(qiang)的(de)(de)(de)(de)(de)互通性，當分(fen)(fen)(fen)頻(pin)(pin)發(fa)射的(de)(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)超過50dB時(shi)(shi)，其(qi)(qi)(qi)抗千擾(rao)(rao)能(neng)力(li)(li)(li)就會減弱。另(ling)外(wai)，在一(yi)些有(you)(you)噪音的(de)(de)(de)(de)(de)環境中使(shi)用分(fen)(fen)(fen)頻(pin)(pin)技術，會使(shi)分(fen)(fen)(fen)頻(pin)(pin)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)無法(fa)到達發(fa)射端的(de)(de)(de)(de)(de)接(jie)收(shou)機或者造成(cheng)發(fa)射端信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)與(yu)接(jie)收(shou)端信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)的(de)(de)(de)(de)(de)糟合而造成(cheng)分(fen)(fen)(fen)頻(pin)(pin)或干(gan)(gan)(gan)擾(rao)(rao)(例(li)如在使(shi)用室外(wai)電話時(shi)(shi)) 。而采用分(fen)(fen)(fen)頻(pin)(pin)技術的(de)(de)(de)(de)(de)無線對講(jiang)(jiang)系統(tong)(tong)由于(yu)發(fa)射功率(lv)(lv)小，分(fen)(fen)(fen)頻(pin)(pin)后(hou)的(de)(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)強(qiang)度比有(you)(you)線對講(jiang)(jiang)系統(tong)(tong)高很多(在實(shi)際使(shi)用中分(fen)(fen)(fen)頻(pin)(pin)設備(bei)一(yi)般可以將系統(tong)(tong)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)分(fen)(fen)(fen)頻(pin)(pin)到50dB以上),信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)不(bu)受(shou)干(gan)(gan)(gan)擾(rao)(rao)。如果采用分(fen)(fen)(fen)頻(pin)(pin)技術，需要在較大(da)的(de)(de)(de)(de)(de)回波功率(lv)(lv)下(xia)才能(neng)實(shi)現信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)的(de)(de)(de)(de)(de)分(fen)(fen)(fen)頻(pin)(pin)工作(如分(fen)(fen)(fen)頻(pin)(pin)器(qi)發(fa)射信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)與(yu)接(jie)收(shou)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)重疊時(shi)(shi)產生的(de)(de)(de)(de)(de)千擾(rao)(rao))和發(fa)送(song)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)強(qiang)度降低(同頻(pin)(pin)帶內(nei)的(de)(de)(de)(de)(de)兩只天(tian)線對同一(yi)信(xin)(xin)(xin)道傳輸的(de)(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)強(qiang)度基本一(yi)致);如果采用混響(xiang)技術，則可以實(shi)現對無線信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)干(gan)(gan)(gan)擾(rao)(rao)的(de)(de)(de)(de)(de)抑制(zhi)或降低。