由(you)于(yu)在(zai)戶外(wai)、室(shi)內等區域，無(wu)線對(dui)講系(xi)(xi)統(tong)(tong)的(de)(de)信號(hao)強度較(jiao)(jiao)弱，而(er)且(qie)采用(yong)頻率調制(zhi)技術（如 MHZ、 NMR、 BSI等）產生的(de)(de)信號(hao)傳輸(shu)時延大(da)，傳輸(shu)距(ju)離遠。因此有(you)線對(dui)講系(xi)(xi)統(tong)(tong)不適(shi)合在(zai)戶外(wai)環(huan)(huan)境(jing)使(shi)用(yong)，特別是(shi)在(zai)冬天及低風速季(ji)節(jie)使(shi)用(yong)。雖然無(wu)線對(dui)講系(xi)(xi)統(tong)(tong)也有(you)著(zhu)不錯(cuo)的(de)(de)效果(guo)(guo)。但由(you)于(yu)系(xi)(xi)統(tong)(tong)工作時會有(you)一(yi)(yi)定的(de)(de)干(gan)擾，使(shi)對(dui)講效果(guo)(guo)下降，另(ling)外(wai)在(zai)信號(hao)較(jiao)(jiao)弱時對(dui)用(yong)戶語音產生了影(ying)響(xiang)。特別是(shi)在(zai)人員復(fu)雜、通信距(ju)離較(jiao)(jiao)短或需要較(jiao)(jiao)長時間使(shi)用(yong)時。因此，更需要有(you)一(yi)(yi)個可靠的(de)(de)無(wu)線對(dui)講系(xi)(xi)統(tong)(tong)提(ti)供與有(you)線對(dui)講系(xi)(xi)統(tong)(tong)一(yi)(yi)樣(yang)的(de)(de)語音信息與控制(zhi)。無(wu)線對(dui)講系(xi)(xi)統(tong)(tong)具有(you)很(hen)高的(de)(de)靈(ling)活性，它能(neng)夠滿足(zu)現場(chang)中(zhong)所有(you)環(huan)(huan)境(jing)使(shi)用(yong)需求并能(neng)隨時切換（如在(zai)野外(wai)、戶外(wai)電話等),用(yong)戶可以在(zai)任何地(di)(di)點使(shi)用(yong)、隨時、隨地(di)(di)進行通訊。使(shi)用(yong)方便(bian)、節(jie)省成本、節(jie)約費用(yong)。下面(mian)我(wo)們來了解一(yi)(yi)下無(wu)線對(dui)講系(xi)(xi)統(tong)(tong)它主要是(shi)什(shen)么優(you)點？

1.性能穩定，可靠性高

在(zai)相(xiang)同無(wu)(wu)線(xian)(xian)傳(chuan)輸距離(li)下(xia)，無(wu)(wu)線(xian)(xian)傳(chuan)輸信(xin)(xin)號更穩定由于使(shi)用(yong)了功率放(fang)大(da)(da)器(qi)來(lai)對無(wu)(wu)線(xian)(xian)信(xin)(xin)號進行壓縮(suo)和放(fang)大(da)(da)，使(shi)無(wu)(wu)線(xian)(xian)信(xin)(xin)號更加穩定可(ke)靠。無(wu)(wu)線(xian)(xian)信(xin)(xin)號在(zai)弱(ruo)電磁(ci)環境下(xia)也(ye)能(neng)(neng)保(bao)(bao)持較(jiao)好(hao)的(de)(de)(de)性(xing)能(neng)(neng)。無(wu)(wu)線(xian)(xian)對講系(xi)統具有(you)發射功率小、抗(kang)千擾(rao)(rao)能(neng)(neng)力(li)強(與(yu)(yu)(yu)有(you)線(xian)(xian)對講系(xi)統比(bi)較(jiao))和抗(kang)電磁(ci)干(gan)擾(rao)(rao)能(neng)(neng)力(li)強(與(yu)(yu)(yu)有(you)線(xian)(xian)對講系(xi)統比(bi)較(jiao))的(de)(de)(de)特點。無(wu)(wu)線(xian)(xian)對講系(xi)統發射信(xin)(xin)號在(zai)發射前(qian)和發射后均(jun)能(neng)(neng)保(bao)(bao)持良好(hao)的(de)(de)(de)性(xing)能(neng)(neng)，使(shi)用(yong)過程中，發射信(xin)(xin)號與(yu)(yu)(yu)接收(shou)信(xin)(xin)號完全不受(shou)任何千擾(rao)(rao)，可(ke)保(bao)(bao)持很好(hao)的(de)(de)(de)穩定性(xing)，具有(you)良好(hao)的(de)(de)(de)抗(kang)千擾(rao)(rao)性(xing)和抗(kang)低(di)頻(pin)干(gan)擾(rao)(rao)能(neng)(neng)力(li)，即使(shi)在(zai)惡劣的(de)(de)(de)環境下(xia)也(ye)能(neng)(neng)保(bao)(bao)持較(jiao)好(hao)的(de)(de)(de)性(xing)能(neng)(neng)。因此無(wu)(wu)線(xian)(xian)系(xi)統有(you)較(jiao)高的(de)(de)(de)可(ke)靠性(xing)。

2.功耗小(xiao)、不受天氣、濕(shi)度(du)的影響

無(wu)線(xian)(xian)對(dui)(dui)(dui)講系(xi)統在不(bu)同(tong)(tong)的(de)(de)環(huan)(huan)境中(zhong)，無(wu)線(xian)(xian)通信設備和有(you)線(xian)(xian)通信設備一(yi)(yi)樣(yang)都(dou)要進行電(dian)(dian)(dian)能的(de)(de)消耗。當(dang)(dang)環(huan)(huan)境溫(wen)度(du)在-40°C以(yi)下時(shi)，無(wu)線(xian)(xian)通信設備需(xu)要每天工(gong)作(zuo)8小(xiao)時(shi)左(zuo)(zuo)右;當(dang)(dang)環(huan)(huan)境溫(wen)度(du)為-20°C時(shi)，每天工(gong)作(zuo)8小(xiao)時(shi)左(zuo)(zuo)右;當(dang)(dang)環(huan)(huan)境溫(wen)度(du)為-30°C時(shi)，每天工(gong)作(zuo)4小(xiao)時(shi)左(zuo)(zuo)右。目前市場上(shang)常見的(de)(de)無(wu)線(xian)(xian)對(dui)(dui)(dui)講系(xi)統有(you)兩種電(dian)(dian)(dian)源(yuan)輸(shu)(shu)入方(fang)(fang)式(shi)(shi)，一(yi)(yi)種是(shi)電(dian)(dian)(dian)源(yuan)輸(shu)(shu)入，另(ling)一(yi)(yi)種是(shi)電(dian)(dian)(dian)源(yuan)輸(shu)(shu)出。從這兩種方(fang)(fang)式(shi)(shi)對(dui)(dui)(dui)系(xi)統的(de)(de)功(gong)耗來看，電(dian)(dian)(dian)源(yuan)輸(shu)(shu)入方(fang)(fang)式(shi)(shi)的(de)(de)功(gong)耗更大一(yi)(yi)些，但(dan)是(shi)功(gong)耗很(hen)小(xiao)。并且(qie)設備的(de)(de)工(gong)作(zuo)環(huan)(huan)境不(bu)同(tong)(tong)，對(dui)(dui)(dui)電(dian)(dian)(dian)池的(de)(de)需(xu)求量也不(bu)同(tong)(tong)，所以(yi)功(gong)耗也不(bu)同(tong)(tong)。

3信號不受干擾

在(zai)(zai)一些(xie)有干(gan)(gan)擾(rao)(rao)(rao)的(de)(de)(de)(de)(de)地方(fang)，例如(ru)(ru)(ru)野外(wai)、機(ji)場、工廠等，一般(ban)(ban)(ban)采用(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)方(fang)式(shi)(shi)。分(fen)(fen)頻(pin)(pin)(pin)方(fang)式(shi)(shi)的(de)(de)(de)(de)(de)抗(kang)(kang)干(gan)(gan)擾(rao)(rao)(rao)能(neng)力不強(qiang)(qiang)(qiang)，其抗(kang)(kang)干(gan)(gan)擾(rao)(rao)(rao)能(neng)力主要(yao)取決于射頻(pin)(pin)(pin)功(gong)率(lv)的(de)(de)(de)(de)(de)大小。分(fen)(fen)頻(pin)(pin)(pin)技(ji)(ji)術的(de)(de)(de)(de)(de)功(gong)率(lv)一般(ban)(ban)(ban)是50dB在(zai)(zai)50dB左(zuo)右時，其抗(kang)(kang)干(gan)(gan)擾(rao)(rao)(rao)能(neng)力強(qiang)(qiang)(qiang)。但由于分(fen)(fen)頻(pin)(pin)(pin)的(de)(de)(de)(de)(de)干(gan)(gan)擾(rao)(rao)(rao)與噪聲(主要(yao)是周邊(bian)噪聲)具有很強(qiang)(qiang)(qiang)的(de)(de)(de)(de)(de)互通性(xing)，當分(fen)(fen)頻(pin)(pin)(pin)發射的(de)(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)超過50dB時，其抗(kang)(kang)千擾(rao)(rao)(rao)能(neng)力就(jiu)會(hui)減弱。另(ling)外(wai)，在(zai)(zai)一些(xie)有噪音的(de)(de)(de)(de)(de)環境中(zhong)使用(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)技(ji)(ji)術，會(hui)使分(fen)(fen)頻(pin)(pin)(pin)信(xin)(xin)(xin)號(hao)無(wu)法到達(da)發射端的(de)(de)(de)(de)(de)接(jie)收(shou)機(ji)或者造(zao)成發射端信(xin)(xin)(xin)號(hao)與接(jie)收(shou)端信(xin)(xin)(xin)號(hao)的(de)(de)(de)(de)(de)糟合(he)而(er)造(zao)成分(fen)(fen)頻(pin)(pin)(pin)或干(gan)(gan)擾(rao)(rao)(rao)(例如(ru)(ru)(ru)在(zai)(zai)使用(yong)(yong)室外(wai)電(dian)話時) 。而(er)采用(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)技(ji)(ji)術的(de)(de)(de)(de)(de)無(wu)線(xian)(xian)對講(jiang)系統由于發射功(gong)率(lv)小，分(fen)(fen)頻(pin)(pin)(pin)后的(de)(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)強(qiang)(qiang)(qiang)度(du)比有線(xian)(xian)對講(jiang)系統高很多(在(zai)(zai)實(shi)際使用(yong)(yong)中(zhong)分(fen)(fen)頻(pin)(pin)(pin)設備一般(ban)(ban)(ban)可以(yi)將(jiang)系統信(xin)(xin)(xin)號(hao)分(fen)(fen)頻(pin)(pin)(pin)到50dB以(yi)上),信(xin)(xin)(xin)號(hao)不受干(gan)(gan)擾(rao)(rao)(rao)。如(ru)(ru)(ru)果采用(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)技(ji)(ji)術，需要(yao)在(zai)(zai)較大的(de)(de)(de)(de)(de)回波功(gong)率(lv)下(xia)才能(neng)實(shi)現(xian)信(xin)(xin)(xin)號(hao)的(de)(de)(de)(de)(de)分(fen)(fen)頻(pin)(pin)(pin)工作(如(ru)(ru)(ru)分(fen)(fen)頻(pin)(pin)(pin)器發射信(xin)(xin)(xin)號(hao)與接(jie)收(shou)信(xin)(xin)(xin)號(hao)重(zhong)疊時產生的(de)(de)(de)(de)(de)千擾(rao)(rao)(rao))和發送信(xin)(xin)(xin)號(hao)強(qiang)(qiang)(qiang)度(du)降低(di)(同頻(pin)(pin)(pin)帶內的(de)(de)(de)(de)(de)兩(liang)只(zhi)天(tian)線(xian)(xian)對同一信(xin)(xin)(xin)道傳輸的(de)(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)強(qiang)(qiang)(qiang)度(du)基本(ben)一致);如(ru)(ru)(ru)果采用(yong)(yong)混響技(ji)(ji)術，則可以(yi)實(shi)現(xian)對無(wu)線(xian)(xian)信(xin)(xin)(xin)號(hao)干(gan)(gan)擾(rao)(rao)(rao)的(de)(de)(de)(de)(de)抑(yi)制或降低(di)。