由(you)于(yu)在(zai)(zai)(zai)戶(hu)外(wai)、室(shi)內等區域(yu)，無(wu)(wu)線(xian)(xian)對(dui)(dui)(dui)講系統(tong)(tong)(tong)的(de)信(xin)(xin)(xin)號強(qiang)度較(jiao)(jiao)弱(ruo)，而且采(cai)用(yong)(yong)(yong)(yong)頻(pin)率調制技術(shu)（如 MHZ、 NMR、 BSI等）產生的(de)信(xin)(xin)(xin)號傳輸時(shi)延(yan)大，傳輸距離(li)遠。因(yin)此有(you)線(xian)(xian)對(dui)(dui)(dui)講系統(tong)(tong)(tong)不(bu)適合在(zai)(zai)(zai)戶(hu)外(wai)環境使用(yong)(yong)(yong)(yong)，特別(bie)是(shi)在(zai)(zai)(zai)冬天及低風速季節(jie)(jie)使用(yong)(yong)(yong)(yong)。雖然無(wu)(wu)線(xian)(xian)對(dui)(dui)(dui)講系統(tong)(tong)(tong)也(ye)有(you)著不(bu)錯的(de)效果(guo)。但(dan)由(you)于(yu)系統(tong)(tong)(tong)工作時(shi)會有(you)一定(ding)的(de)干擾，使對(dui)(dui)(dui)講效果(guo)下(xia)(xia)(xia)降(jiang)，另(ling)外(wai)在(zai)(zai)(zai)信(xin)(xin)(xin)號較(jiao)(jiao)弱(ruo)時(shi)對(dui)(dui)(dui)用(yong)(yong)(yong)(yong)戶(hu)語音產生了影響。特別(bie)是(shi)在(zai)(zai)(zai)人員復雜、通(tong)信(xin)(xin)(xin)距離(li)較(jiao)(jiao)短或需要較(jiao)(jiao)長時(shi)間(jian)使用(yong)(yong)(yong)(yong)時(shi)。因(yin)此，更(geng)需要有(you)一個可靠的(de)無(wu)(wu)線(xian)(xian)對(dui)(dui)(dui)講系統(tong)(tong)(tong)提供與有(you)線(xian)(xian)對(dui)(dui)(dui)講系統(tong)(tong)(tong)一樣的(de)語音信(xin)(xin)(xin)息與控制。無(wu)(wu)線(xian)(xian)對(dui)(dui)(dui)講系統(tong)(tong)(tong)具有(you)很高的(de)靈活性(xing)，它能夠滿(man)足現場中所有(you)環境使用(yong)(yong)(yong)(yong)需求并能隨時(shi)切換（如在(zai)(zai)(zai)野外(wai)、戶(hu)外(wai)電(dian)話等),用(yong)(yong)(yong)(yong)戶(hu)可以在(zai)(zai)(zai)任何地點使用(yong)(yong)(yong)(yong)、隨時(shi)、隨地進(jin)行通(tong)訊(xun)。使用(yong)(yong)(yong)(yong)方便(bian)、節(jie)(jie)省成本、節(jie)(jie)約(yue)費用(yong)(yong)(yong)(yong)。下(xia)(xia)(xia)面我們來(lai)了解一下(xia)(xia)(xia)無(wu)(wu)線(xian)(xian)對(dui)(dui)(dui)講系統(tong)(tong)(tong)它主要是(shi)什么優點？

1.性能(neng)穩定，可靠性高

在(zai)(zai)相(xiang)同無(wu)(wu)線(xian)(xian)傳輸(shu)距(ju)離下，無(wu)(wu)線(xian)(xian)傳輸(shu)信(xin)(xin)號(hao)(hao)更穩定由于使(shi)(shi)用了功率(lv)放大(da)器來對無(wu)(wu)線(xian)(xian)信(xin)(xin)號(hao)(hao)進(jin)行壓(ya)縮和放大(da)，使(shi)(shi)無(wu)(wu)線(xian)(xian)信(xin)(xin)號(hao)(hao)更加穩定可(ke)靠。無(wu)(wu)線(xian)(xian)信(xin)(xin)號(hao)(hao)在(zai)(zai)弱(ruo)電磁環(huan)境(jing)下也能(neng)(neng)保(bao)持(chi)較(jiao)(jiao)好的(de)(de)(de)性(xing)能(neng)(neng)。無(wu)(wu)線(xian)(xian)對講系(xi)統(tong)(tong)具有(you)(you)發(fa)射(she)功率(lv)小、抗千擾(rao)(rao)能(neng)(neng)力強(與有(you)(you)線(xian)(xian)對講系(xi)統(tong)(tong)比較(jiao)(jiao))和抗電磁干擾(rao)(rao)能(neng)(neng)力強(與有(you)(you)線(xian)(xian)對講系(xi)統(tong)(tong)比較(jiao)(jiao))的(de)(de)(de)特(te)點。無(wu)(wu)線(xian)(xian)對講系(xi)統(tong)(tong)發(fa)射(she)信(xin)(xin)號(hao)(hao)在(zai)(zai)發(fa)射(she)前(qian)和發(fa)射(she)后均能(neng)(neng)保(bao)持(chi)良(liang)好的(de)(de)(de)性(xing)能(neng)(neng)，使(shi)(shi)用過程中，發(fa)射(she)信(xin)(xin)號(hao)(hao)與接(jie)收信(xin)(xin)號(hao)(hao)完全不受任何千擾(rao)(rao)，可(ke)保(bao)持(chi)很好的(de)(de)(de)穩定性(xing)，具有(you)(you)良(liang)好的(de)(de)(de)抗千擾(rao)(rao)性(xing)和抗低頻干擾(rao)(rao)能(neng)(neng)力，即(ji)使(shi)(shi)在(zai)(zai)惡劣(lie)的(de)(de)(de)環(huan)境(jing)下也能(neng)(neng)保(bao)持(chi)較(jiao)(jiao)好的(de)(de)(de)性(xing)能(neng)(neng)。因此(ci)無(wu)(wu)線(xian)(xian)系(xi)統(tong)(tong)有(you)(you)較(jiao)(jiao)高的(de)(de)(de)可(ke)靠性(xing)。

2.功耗小、不受天氣、濕度的影響(xiang)

無線(xian)(xian)對(dui)講(jiang)系(xi)統在(zai)不同(tong)的(de)(de)環(huan)境(jing)(jing)(jing)中，無線(xian)(xian)通信(xin)設(she)備和有(you)線(xian)(xian)通信(xin)設(she)備一(yi)樣(yang)都要(yao)進(jin)行電(dian)能的(de)(de)消耗(hao)。當(dang)環(huan)境(jing)(jing)(jing)溫(wen)度在(zai)-40°C以下時(shi)，無線(xian)(xian)通信(xin)設(she)備需要(yao)每天工(gong)作(zuo)(zuo)8小(xiao)時(shi)左(zuo)右;當(dang)環(huan)境(jing)(jing)(jing)溫(wen)度為-20°C時(shi)，每天工(gong)作(zuo)(zuo)8小(xiao)時(shi)左(zuo)右;當(dang)環(huan)境(jing)(jing)(jing)溫(wen)度為-30°C時(shi)，每天工(gong)作(zuo)(zuo)4小(xiao)時(shi)左(zuo)右。目前(qian)市場上常見(jian)的(de)(de)無線(xian)(xian)對(dui)講(jiang)系(xi)統有(you)兩(liang)(liang)種(zhong)電(dian)源輸(shu)入方式，一(yi)種(zhong)是電(dian)源輸(shu)入，另一(yi)種(zhong)是電(dian)源輸(shu)出。從這兩(liang)(liang)種(zhong)方式對(dui)系(xi)統的(de)(de)功耗(hao)來看，電(dian)源輸(shu)入方式的(de)(de)功耗(hao)更(geng)大一(yi)些(xie)，但(dan)是功耗(hao)很小(xiao)。并(bing)且設(she)備的(de)(de)工(gong)作(zuo)(zuo)環(huan)境(jing)(jing)(jing)不同(tong)，對(dui)電(dian)池的(de)(de)需求(qiu)量也(ye)(ye)不同(tong)，所以功耗(hao)也(ye)(ye)不同(tong)。

3信號不受干擾

在一(yi)些(xie)有(you)干(gan)(gan)(gan)擾(rao)(rao)(rao)的(de)(de)(de)(de)地方(fang)(fang)，例如(ru)野外(wai)、機場、工廠等(deng)，一(yi)般(ban)采用(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)方(fang)(fang)式。分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)方(fang)(fang)式的(de)(de)(de)(de)抗干(gan)(gan)(gan)擾(rao)(rao)(rao)能(neng)(neng)(neng)力(li)(li)不(bu)強(qiang)，其抗干(gan)(gan)(gan)擾(rao)(rao)(rao)能(neng)(neng)(neng)力(li)(li)主(zhu)要(yao)取決于(yu)射(she)(she)(she)頻(pin)(pin)(pin)(pin)(pin)功率(lv)(lv)的(de)(de)(de)(de)大小。分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)(ji)術的(de)(de)(de)(de)功率(lv)(lv)一(yi)般(ban)是50dB在50dB左(zuo)右時(shi)，其抗干(gan)(gan)(gan)擾(rao)(rao)(rao)能(neng)(neng)(neng)力(li)(li)強(qiang)。但由于(yu)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)的(de)(de)(de)(de)干(gan)(gan)(gan)擾(rao)(rao)(rao)與噪(zao)聲(sheng)(sheng)(主(zhu)要(yao)是周邊噪(zao)聲(sheng)(sheng))具(ju)有(you)很強(qiang)的(de)(de)(de)(de)互通性，當分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)發(fa)(fa)射(she)(she)(she)的(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)超過50dB時(shi)，其抗千擾(rao)(rao)(rao)能(neng)(neng)(neng)力(li)(li)就會減弱(ruo)。另外(wai)，在一(yi)些(xie)有(you)噪(zao)音的(de)(de)(de)(de)環境中使用(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)(ji)術，會使分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)信(xin)(xin)號(hao)(hao)(hao)無法到(dao)達(da)發(fa)(fa)射(she)(she)(she)端(duan)(duan)(duan)的(de)(de)(de)(de)接收機或者造成發(fa)(fa)射(she)(she)(she)端(duan)(duan)(duan)信(xin)(xin)號(hao)(hao)(hao)與接收端(duan)(duan)(duan)信(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)糟合(he)而造成分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)或干(gan)(gan)(gan)擾(rao)(rao)(rao)(例如(ru)在使用(yong)室(shi)外(wai)電話時(shi)) 。而采用(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)(ji)術的(de)(de)(de)(de)無線(xian)對講(jiang)系(xi)(xi)統(tong)由于(yu)發(fa)(fa)射(she)(she)(she)功率(lv)(lv)小，分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)后(hou)的(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)強(qiang)度(du)比有(you)線(xian)對講(jiang)系(xi)(xi)統(tong)高很多(在實際使用(yong)中分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)設(she)備一(yi)般(ban)可(ke)(ke)以(yi)將(jiang)系(xi)(xi)統(tong)信(xin)(xin)號(hao)(hao)(hao)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)到(dao)50dB以(yi)上),信(xin)(xin)號(hao)(hao)(hao)不(bu)受干(gan)(gan)(gan)擾(rao)(rao)(rao)。如(ru)果(guo)采用(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)(ji)術，需要(yao)在較大的(de)(de)(de)(de)回波功率(lv)(lv)下(xia)才能(neng)(neng)(neng)實現信(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)工作(zuo)(如(ru)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)器發(fa)(fa)射(she)(she)(she)信(xin)(xin)號(hao)(hao)(hao)與接收信(xin)(xin)號(hao)(hao)(hao)重疊時(shi)產生的(de)(de)(de)(de)千擾(rao)(rao)(rao))和發(fa)(fa)送信(xin)(xin)號(hao)(hao)(hao)強(qiang)度(du)降低(同頻(pin)(pin)(pin)(pin)(pin)帶(dai)內(nei)的(de)(de)(de)(de)兩只天線(xian)對同一(yi)信(xin)(xin)道傳輸的(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)強(qiang)度(du)基本一(yi)致);如(ru)果(guo)采用(yong)混(hun)響技(ji)(ji)術，則可(ke)(ke)以(yi)實現對無線(xian)信(xin)(xin)號(hao)(hao)(hao)干(gan)(gan)(gan)擾(rao)(rao)(rao)的(de)(de)(de)(de)抑制或降低。