由于(yu)(yu)在戶(hu)(hu)外(wai)(wai)、室內等區(qu)域，無(wu)線對(dui)講(jiang)系(xi)(xi)(xi)(xi)統的(de)(de)(de)信(xin)(xin)號(hao)強(qiang)度較弱(ruo)，而且(qie)采(cai)用(yong)(yong)(yong)(yong)(yong)頻率調制技術（如(ru) MHZ、 NMR、 BSI等）產生的(de)(de)(de)信(xin)(xin)號(hao)傳輸(shu)時(shi)(shi)延大，傳輸(shu)距離遠。因(yin)此有(you)(you)(you)線對(dui)講(jiang)系(xi)(xi)(xi)(xi)統不適合在戶(hu)(hu)外(wai)(wai)環境使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)(yong)，特(te)別(bie)是在冬天(tian)及低風速季(ji)節(jie)使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)(yong)。雖(sui)然無(wu)線對(dui)講(jiang)系(xi)(xi)(xi)(xi)統也(ye)有(you)(you)(you)著不錯的(de)(de)(de)效(xiao)果。但由于(yu)(yu)系(xi)(xi)(xi)(xi)統工作時(shi)(shi)會有(you)(you)(you)一(yi)(yi)定的(de)(de)(de)干擾，使(shi)(shi)(shi)對(dui)講(jiang)效(xiao)果下(xia)降，另外(wai)(wai)在信(xin)(xin)號(hao)較弱(ruo)時(shi)(shi)對(dui)用(yong)(yong)(yong)(yong)(yong)戶(hu)(hu)語音產生了影響。特(te)別(bie)是在人員復雜、通(tong)信(xin)(xin)距離較短或需(xu)(xu)要(yao)較長時(shi)(shi)間使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)(yong)時(shi)(shi)。因(yin)此，更需(xu)(xu)要(yao)有(you)(you)(you)一(yi)(yi)個可(ke)靠的(de)(de)(de)無(wu)線對(dui)講(jiang)系(xi)(xi)(xi)(xi)統提供(gong)與有(you)(you)(you)線對(dui)講(jiang)系(xi)(xi)(xi)(xi)統一(yi)(yi)樣的(de)(de)(de)語音信(xin)(xin)息與控(kong)制。無(wu)線對(dui)講(jiang)系(xi)(xi)(xi)(xi)統具有(you)(you)(you)很高的(de)(de)(de)靈活性，它能夠滿足現場中所有(you)(you)(you)環境使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)(yong)需(xu)(xu)求(qiu)并能隨時(shi)(shi)切換（如(ru)在野外(wai)(wai)、戶(hu)(hu)外(wai)(wai)電話(hua)等),用(yong)(yong)(yong)(yong)(yong)戶(hu)(hu)可(ke)以在任何地點(dian)使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)(yong)、隨時(shi)(shi)、隨地進行通(tong)訊。使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)(yong)方(fang)便、節(jie)省成(cheng)本(ben)、節(jie)約費用(yong)(yong)(yong)(yong)(yong)。下(xia)面(mian)我們來了解一(yi)(yi)下(xia)無(wu)線對(dui)講(jiang)系(xi)(xi)(xi)(xi)統它主要(yao)是什么優點(dian)？

1.性能穩(wen)定，可靠性高

在相同無(wu)線(xian)(xian)傳輸距離下，無(wu)線(xian)(xian)傳輸信(xin)號(hao)(hao)(hao)更穩(wen)(wen)(wen)定(ding)由于使(shi)用了功率(lv)放大器來對(dui)無(wu)線(xian)(xian)信(xin)號(hao)(hao)(hao)進(jin)行壓(ya)縮和(he)放大，使(shi)無(wu)線(xian)(xian)信(xin)號(hao)(hao)(hao)更加穩(wen)(wen)(wen)定(ding)可(ke)靠(kao)。無(wu)線(xian)(xian)信(xin)號(hao)(hao)(hao)在弱(ruo)電磁環境下也(ye)能(neng)(neng)保(bao)持較好(hao)(hao)(hao)(hao)的(de)性(xing)能(neng)(neng)。無(wu)線(xian)(xian)對(dui)講系(xi)統(tong)具有(you)發(fa)(fa)射(she)功率(lv)小、抗(kang)(kang)千(qian)擾(rao)(rao)能(neng)(neng)力強(與(yu)有(you)線(xian)(xian)對(dui)講系(xi)統(tong)比較)和(he)抗(kang)(kang)電磁干擾(rao)(rao)能(neng)(neng)力強(與(yu)有(you)線(xian)(xian)對(dui)講系(xi)統(tong)比較)的(de)特點。無(wu)線(xian)(xian)對(dui)講系(xi)統(tong)發(fa)(fa)射(she)信(xin)號(hao)(hao)(hao)在發(fa)(fa)射(she)前和(he)發(fa)(fa)射(she)后均能(neng)(neng)保(bao)持良(liang)好(hao)(hao)(hao)(hao)的(de)性(xing)能(neng)(neng)，使(shi)用過程中，發(fa)(fa)射(she)信(xin)號(hao)(hao)(hao)與(yu)接收信(xin)號(hao)(hao)(hao)完(wan)全不受任何千(qian)擾(rao)(rao)，可(ke)保(bao)持很好(hao)(hao)(hao)(hao)的(de)穩(wen)(wen)(wen)定(ding)性(xing)，具有(you)良(liang)好(hao)(hao)(hao)(hao)的(de)抗(kang)(kang)千(qian)擾(rao)(rao)性(xing)和(he)抗(kang)(kang)低(di)頻(pin)干擾(rao)(rao)能(neng)(neng)力，即使(shi)在惡劣(lie)的(de)環境下也(ye)能(neng)(neng)保(bao)持較好(hao)(hao)(hao)(hao)的(de)性(xing)能(neng)(neng)。因此無(wu)線(xian)(xian)系(xi)統(tong)有(you)較高的(de)可(ke)靠(kao)性(xing)。

2.功耗小、不(bu)受天(tian)氣、濕度(du)的影響(xiang)

無線(xian)對(dui)(dui)(dui)講系統在不(bu)同(tong)的(de)環(huan)境中(zhong)，無線(xian)通(tong)信(xin)(xin)設備(bei)和有(you)線(xian)通(tong)信(xin)(xin)設備(bei)一(yi)樣都(dou)要進行電(dian)能(neng)的(de)消(xiao)耗(hao)(hao)。當(dang)環(huan)境溫(wen)度在-40°C以(yi)下時(shi)，無線(xian)通(tong)信(xin)(xin)設備(bei)需(xu)(xu)要每(mei)(mei)天工(gong)作8小(xiao)時(shi)左(zuo)右(you)(you);當(dang)環(huan)境溫(wen)度為(wei)-20°C時(shi)，每(mei)(mei)天工(gong)作8小(xiao)時(shi)左(zuo)右(you)(you);當(dang)環(huan)境溫(wen)度為(wei)-30°C時(shi)，每(mei)(mei)天工(gong)作4小(xiao)時(shi)左(zuo)右(you)(you)。目前(qian)市場上常(chang)見的(de)無線(xian)對(dui)(dui)(dui)講系統有(you)兩種(zhong)電(dian)源(yuan)輸(shu)入(ru)方式，一(yi)種(zhong)是電(dian)源(yuan)輸(shu)入(ru)，另一(yi)種(zhong)是電(dian)源(yuan)輸(shu)出(chu)。從這兩種(zhong)方式對(dui)(dui)(dui)系統的(de)功(gong)耗(hao)(hao)來看(kan)，電(dian)源(yuan)輸(shu)入(ru)方式的(de)功(gong)耗(hao)(hao)更(geng)大(da)一(yi)些(xie)，但是功(gong)耗(hao)(hao)很小(xiao)。并且設備(bei)的(de)工(gong)作環(huan)境不(bu)同(tong)，對(dui)(dui)(dui)電(dian)池的(de)需(xu)(xu)求量也(ye)不(bu)同(tong)，所(suo)以(yi)功(gong)耗(hao)(hao)也(ye)不(bu)同(tong)。

3信號不受干擾

在一(yi)(yi)些有(you)(you)干(gan)(gan)擾的(de)(de)(de)(de)(de)地方(fang)，例(li)如野(ye)外(wai)(wai)、機(ji)場(chang)、工廠(chang)等，一(yi)(yi)般采(cai)(cai)用分(fen)(fen)(fen)(fen)頻(pin)方(fang)式。分(fen)(fen)(fen)(fen)頻(pin)方(fang)式的(de)(de)(de)(de)(de)抗干(gan)(gan)擾能力(li)(li)不強，其抗干(gan)(gan)擾能力(li)(li)主要(yao)取決于射(she)頻(pin)功率的(de)(de)(de)(de)(de)大(da)小。分(fen)(fen)(fen)(fen)頻(pin)技術的(de)(de)(de)(de)(de)功率一(yi)(yi)般是(shi)50dB在50dB左(zuo)右時(shi)，其抗干(gan)(gan)擾能力(li)(li)強。但由于分(fen)(fen)(fen)(fen)頻(pin)的(de)(de)(de)(de)(de)干(gan)(gan)擾與噪聲(sheng)(主要(yao)是(shi)周邊噪聲(sheng))具有(you)(you)很強的(de)(de)(de)(de)(de)互(hu)通(tong)性，當分(fen)(fen)(fen)(fen)頻(pin)發(fa)射(she)的(de)(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)超過50dB時(shi)，其抗千擾能力(li)(li)就會(hui)減弱。另(ling)外(wai)(wai)，在一(yi)(yi)些有(you)(you)噪音的(de)(de)(de)(de)(de)環境中(zhong)使(shi)用分(fen)(fen)(fen)(fen)頻(pin)技術，會(hui)使(shi)分(fen)(fen)(fen)(fen)頻(pin)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)無(wu)法(fa)到達發(fa)射(she)端(duan)(duan)(duan)的(de)(de)(de)(de)(de)接收機(ji)或(huo)(huo)者造(zao)成(cheng)(cheng)發(fa)射(she)端(duan)(duan)(duan)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)與接收端(duan)(duan)(duan)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)的(de)(de)(de)(de)(de)糟合(he)而造(zao)成(cheng)(cheng)分(fen)(fen)(fen)(fen)頻(pin)或(huo)(huo)干(gan)(gan)擾(例(li)如在使(shi)用室(shi)外(wai)(wai)電話(hua)時(shi)) 。而采(cai)(cai)用分(fen)(fen)(fen)(fen)頻(pin)技術的(de)(de)(de)(de)(de)無(wu)線(xian)對(dui)講系(xi)統(tong)(tong)由于發(fa)射(she)功率小，分(fen)(fen)(fen)(fen)頻(pin)后的(de)(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)強度(du)比有(you)(you)線(xian)對(dui)講系(xi)統(tong)(tong)高很多(在實際使(shi)用中(zhong)分(fen)(fen)(fen)(fen)頻(pin)設備(bei)一(yi)(yi)般可(ke)以(yi)將系(xi)統(tong)(tong)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)分(fen)(fen)(fen)(fen)頻(pin)到50dB以(yi)上),信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)不受干(gan)(gan)擾。如果采(cai)(cai)用分(fen)(fen)(fen)(fen)頻(pin)技術，需要(yao)在較(jiao)大(da)的(de)(de)(de)(de)(de)回波功率下才能實現信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)的(de)(de)(de)(de)(de)分(fen)(fen)(fen)(fen)頻(pin)工作(如分(fen)(fen)(fen)(fen)頻(pin)器發(fa)射(she)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)與接收信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)重疊時(shi)產(chan)生(sheng)的(de)(de)(de)(de)(de)千擾)和發(fa)送信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)強度(du)降低(di)(同頻(pin)帶內的(de)(de)(de)(de)(de)兩只天線(xian)對(dui)同一(yi)(yi)信(xin)(xin)(xin)道傳輸的(de)(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)強度(du)基(ji)本一(yi)(yi)致(zhi));如果采(cai)(cai)用混響技術，則(ze)可(ke)以(yi)實現對(dui)無(wu)線(xian)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)干(gan)(gan)擾的(de)(de)(de)(de)(de)抑(yi)制或(huo)(huo)降低(di)。