由于在(zai)戶外(wai)、室內等區域，無(wu)(wu)線(xian)(xian)對講(jiang)系(xi)統(tong)的(de)信(xin)(xin)(xin)號強(qiang)度(du)較(jiao)(jiao)弱，而且采用(yong)(yong)(yong)(yong)(yong)頻率調(diao)制技術（如(ru) MHZ、 NMR、 BSI等）產生的(de)信(xin)(xin)(xin)號傳輸時(shi)延大，傳輸距離遠。因此(ci)有(you)線(xian)(xian)對講(jiang)系(xi)統(tong)不(bu)適合(he)在(zai)戶外(wai)環境(jing)使(shi)用(yong)(yong)(yong)(yong)(yong)，特(te)別是在(zai)冬(dong)天及(ji)低風速季(ji)節(jie)使(shi)用(yong)(yong)(yong)(yong)(yong)。雖然無(wu)(wu)線(xian)(xian)對講(jiang)系(xi)統(tong)也有(you)著不(bu)錯的(de)效(xiao)(xiao)果。但由于系(xi)統(tong)工作時(shi)會有(you)一(yi)定的(de)干(gan)擾，使(shi)對講(jiang)效(xiao)(xiao)果下(xia)降，另外(wai)在(zai)信(xin)(xin)(xin)號較(jiao)(jiao)弱時(shi)對用(yong)(yong)(yong)(yong)(yong)戶語(yu)音產生了影響。特(te)別是在(zai)人員復雜、通(tong)信(xin)(xin)(xin)距離較(jiao)(jiao)短或(huo)需(xu)要(yao)較(jiao)(jiao)長時(shi)間使(shi)用(yong)(yong)(yong)(yong)(yong)時(shi)。因此(ci)，更需(xu)要(yao)有(you)一(yi)個可(ke)靠的(de)無(wu)(wu)線(xian)(xian)對講(jiang)系(xi)統(tong)提供與(yu)有(you)線(xian)(xian)對講(jiang)系(xi)統(tong)一(yi)樣的(de)語(yu)音信(xin)(xin)(xin)息與(yu)控(kong)制。無(wu)(wu)線(xian)(xian)對講(jiang)系(xi)統(tong)具(ju)有(you)很高的(de)靈活性，它(ta)能夠滿足現場(chang)中所(suo)有(you)環境(jing)使(shi)用(yong)(yong)(yong)(yong)(yong)需(xu)求(qiu)并能隨時(shi)切換（如(ru)在(zai)野外(wai)、戶外(wai)電(dian)話(hua)等),用(yong)(yong)(yong)(yong)(yong)戶可(ke)以在(zai)任何(he)地點使(shi)用(yong)(yong)(yong)(yong)(yong)、隨時(shi)、隨地進行通(tong)訊。使(shi)用(yong)(yong)(yong)(yong)(yong)方便、節(jie)省成(cheng)本(ben)、節(jie)約費用(yong)(yong)(yong)(yong)(yong)。下(xia)面我(wo)們來(lai)了解一(yi)下(xia)無(wu)(wu)線(xian)(xian)對講(jiang)系(xi)統(tong)它(ta)主要(yao)是什么(me)優點？

1.性(xing)能穩定，可靠性(xing)高

在(zai)相(xiang)同無(wu)(wu)(wu)線(xian)傳(chuan)輸(shu)距離下(xia)，無(wu)(wu)(wu)線(xian)傳(chuan)輸(shu)信(xin)(xin)號更(geng)穩(wen)定(ding)(ding)(ding)由于使(shi)(shi)用(yong)了功(gong)(gong)率放大器(qi)來對(dui)(dui)(dui)無(wu)(wu)(wu)線(xian)信(xin)(xin)號進行(xing)壓縮和(he)放大，使(shi)(shi)無(wu)(wu)(wu)線(xian)信(xin)(xin)號更(geng)加(jia)穩(wen)定(ding)(ding)(ding)可靠(kao)。無(wu)(wu)(wu)線(xian)信(xin)(xin)號在(zai)弱電(dian)磁(ci)環境下(xia)也能(neng)(neng)保持較好(hao)的(de)(de)性(xing)能(neng)(neng)。無(wu)(wu)(wu)線(xian)對(dui)(dui)(dui)講系(xi)(xi)統(tong)(tong)具(ju)有發(fa)射(she)功(gong)(gong)率小、抗千擾能(neng)(neng)力(li)強(qiang)(與有線(xian)對(dui)(dui)(dui)講系(xi)(xi)統(tong)(tong)比較)和(he)抗電(dian)磁(ci)干擾能(neng)(neng)力(li)強(qiang)(與有線(xian)對(dui)(dui)(dui)講系(xi)(xi)統(tong)(tong)比較)的(de)(de)特點。無(wu)(wu)(wu)線(xian)對(dui)(dui)(dui)講系(xi)(xi)統(tong)(tong)發(fa)射(she)信(xin)(xin)號在(zai)發(fa)射(she)前和(he)發(fa)射(she)后(hou)均(jun)能(neng)(neng)保持良好(hao)的(de)(de)性(xing)能(neng)(neng)，使(shi)(shi)用(yong)過程中，發(fa)射(she)信(xin)(xin)號與接收(shou)信(xin)(xin)號完全不受任何千擾，可保持很好(hao)的(de)(de)穩(wen)定(ding)(ding)(ding)性(xing)，具(ju)有良好(hao)的(de)(de)抗千擾性(xing)和(he)抗低頻干擾能(neng)(neng)力(li)，即使(shi)(shi)在(zai)惡(e)劣的(de)(de)環境下(xia)也能(neng)(neng)保持較好(hao)的(de)(de)性(xing)能(neng)(neng)。因此(ci)無(wu)(wu)(wu)線(xian)系(xi)(xi)統(tong)(tong)有較高的(de)(de)可靠(kao)性(xing)。

2.功耗小、不受天(tian)氣、濕度(du)的影(ying)響

無線(xian)(xian)對講(jiang)系統(tong)在(zai)不(bu)同(tong)(tong)的(de)環(huan)境(jing)中，無線(xian)(xian)通信設(she)(she)備(bei)和有(you)線(xian)(xian)通信設(she)(she)備(bei)一(yi)樣都要進行電(dian)能的(de)消(xiao)耗(hao)(hao)(hao)。當環(huan)境(jing)溫度在(zai)-40°C以下時，無線(xian)(xian)通信設(she)(she)備(bei)需要每天工作8小(xiao)(xiao)時左右(you);當環(huan)境(jing)溫度為(wei)-20°C時，每天工作8小(xiao)(xiao)時左右(you);當環(huan)境(jing)溫度為(wei)-30°C時，每天工作4小(xiao)(xiao)時左右(you)。目(mu)前(qian)市場上常見的(de)無線(xian)(xian)對講(jiang)系統(tong)有(you)兩種電(dian)源(yuan)輸(shu)入方式(shi)，一(yi)種是(shi)電(dian)源(yuan)輸(shu)入，另一(yi)種是(shi)電(dian)源(yuan)輸(shu)出(chu)。從這兩種方式(shi)對系統(tong)的(de)功(gong)(gong)耗(hao)(hao)(hao)來看，電(dian)源(yuan)輸(shu)入方式(shi)的(de)功(gong)(gong)耗(hao)(hao)(hao)更(geng)大一(yi)些(xie)，但(dan)是(shi)功(gong)(gong)耗(hao)(hao)(hao)很小(xiao)(xiao)。并且(qie)設(she)(she)備(bei)的(de)工作環(huan)境(jing)不(bu)同(tong)(tong)，對電(dian)池的(de)需求量也(ye)(ye)不(bu)同(tong)(tong)，所以功(gong)(gong)耗(hao)(hao)(hao)也(ye)(ye)不(bu)同(tong)(tong)。

3信號不受干擾

在(zai)一(yi)(yi)些有(you)干擾的地方，例如(ru)野外、機(ji)場、工廠等，一(yi)(yi)般采(cai)用(yong)(yong)分(fen)(fen)頻(pin)方式。分(fen)(fen)頻(pin)方式的抗(kang)(kang)干擾能(neng)(neng)(neng)力不(bu)強(qiang)(qiang)(qiang)，其(qi)抗(kang)(kang)干擾能(neng)(neng)(neng)力主(zhu)要(yao)取決于射(she)(she)頻(pin)功率(lv)(lv)的大小(xiao)。分(fen)(fen)頻(pin)技術的功率(lv)(lv)一(yi)(yi)般是(shi)(shi)50dB在(zai)50dB左(zuo)右時(shi)，其(qi)抗(kang)(kang)干擾能(neng)(neng)(neng)力強(qiang)(qiang)(qiang)。但由于分(fen)(fen)頻(pin)的干擾與(yu)噪聲(sheng)(主(zhu)要(yao)是(shi)(shi)周邊噪聲(sheng))具有(you)很強(qiang)(qiang)(qiang)的互(hu)通性，當分(fen)(fen)頻(pin)發(fa)(fa)(fa)射(she)(she)的信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)超(chao)過50dB時(shi)，其(qi)抗(kang)(kang)千(qian)擾能(neng)(neng)(neng)力就會(hui)減弱。另(ling)外，在(zai)一(yi)(yi)些有(you)噪音的環境中(zhong)使用(yong)(yong)分(fen)(fen)頻(pin)技術，會(hui)使分(fen)(fen)頻(pin)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)無(wu)法到達發(fa)(fa)(fa)射(she)(she)端(duan)的接收機(ji)或者造(zao)成發(fa)(fa)(fa)射(she)(she)端(duan)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接收端(duan)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)的糟合(he)而造(zao)成分(fen)(fen)頻(pin)或干擾(例如(ru)在(zai)使用(yong)(yong)室外電話時(shi)) 。而采(cai)用(yong)(yong)分(fen)(fen)頻(pin)技術的無(wu)線(xian)對(dui)(dui)講系(xi)統由于發(fa)(fa)(fa)射(she)(she)功率(lv)(lv)小(xiao)，分(fen)(fen)頻(pin)后(hou)的信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)(qiang)度比有(you)線(xian)對(dui)(dui)講系(xi)統高(gao)很多(duo)(在(zai)實際使用(yong)(yong)中(zhong)分(fen)(fen)頻(pin)設備(bei)一(yi)(yi)般可以(yi)將(jiang)系(xi)統信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)分(fen)(fen)頻(pin)到50dB以(yi)上),信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)不(bu)受干擾。如(ru)果采(cai)用(yong)(yong)分(fen)(fen)頻(pin)技術，需要(yao)在(zai)較大的回(hui)波功率(lv)(lv)下才能(neng)(neng)(neng)實現信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)的分(fen)(fen)頻(pin)工作(zuo)(如(ru)分(fen)(fen)頻(pin)器發(fa)(fa)(fa)射(she)(she)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接收信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)重疊時(shi)產生的千(qian)擾)和發(fa)(fa)(fa)送信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)(qiang)度降低(同頻(pin)帶內的兩只天線(xian)對(dui)(dui)同一(yi)(yi)信(xin)(xin)(xin)(xin)(xin)道傳輸(shu)的信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)(qiang)度基本一(yi)(yi)致);如(ru)果采(cai)用(yong)(yong)混響技術，則可以(yi)實現對(dui)(dui)無(wu)線(xian)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)干擾的抑制或降低。