由于(yu)在戶(hu)外(wai)、室內(nei)等(deng)區域(yu)，無(wu)線對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)的(de)信(xin)號強度較弱(ruo)，而且采用(yong)(yong)(yong)頻率調制(zhi)技術（如 MHZ、 NMR、 BSI等(deng)）產(chan)生(sheng)的(de)信(xin)號傳輸時(shi)延大，傳輸距離遠。因(yin)此(ci)有線對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)不(bu)適合(he)在戶(hu)外(wai)環境使(shi)用(yong)(yong)(yong)，特別是在冬天及低(di)風(feng)速季(ji)節(jie)使(shi)用(yong)(yong)(yong)。雖(sui)然無(wu)線對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)也有著不(bu)錯(cuo)的(de)效(xiao)果。但(dan)由于(yu)系(xi)統(tong)(tong)(tong)工作時(shi)會有一定的(de)干(gan)擾，使(shi)對(dui)(dui)講(jiang)(jiang)效(xiao)果下降，另外(wai)在信(xin)號較弱(ruo)時(shi)對(dui)(dui)用(yong)(yong)(yong)戶(hu)語(yu)音產(chan)生(sheng)了影響。特別是在人(ren)員復雜、通信(xin)距離較短或需(xu)要較長時(shi)間使(shi)用(yong)(yong)(yong)時(shi)。因(yin)此(ci)，更需(xu)要有一個(ge)可靠的(de)無(wu)線對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)提(ti)供(gong)與(yu)有線對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)一樣的(de)語(yu)音信(xin)息與(yu)控(kong)制(zhi)。無(wu)線對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)具有很高的(de)靈活性，它能(neng)夠滿足現場中所有環境使(shi)用(yong)(yong)(yong)需(xu)求(qiu)并能(neng)隨時(shi)切(qie)換（如在野外(wai)、戶(hu)外(wai)電話等(deng)),用(yong)(yong)(yong)戶(hu)可以在任何(he)地點(dian)使(shi)用(yong)(yong)(yong)、隨時(shi)、隨地進(jin)行通訊。使(shi)用(yong)(yong)(yong)方便、節(jie)省成本、節(jie)約費用(yong)(yong)(yong)。下面我們(men)來(lai)了解(jie)一下無(wu)線對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)它主要是什么優點(dian)？

1.性能穩定，可靠性高

在相(xiang)同無(wu)線(xian)(xian)傳輸距離下，無(wu)線(xian)(xian)傳輸信號(hao)(hao)(hao)更(geng)(geng)穩定(ding)(ding)由于使(shi)用(yong)了功率放大器(qi)來對(dui)(dui)(dui)無(wu)線(xian)(xian)信號(hao)(hao)(hao)進行壓縮(suo)和放大，使(shi)無(wu)線(xian)(xian)信號(hao)(hao)(hao)更(geng)(geng)加穩定(ding)(ding)可靠(kao)。無(wu)線(xian)(xian)信號(hao)(hao)(hao)在弱電磁環境下也(ye)能(neng)(neng)保(bao)持較(jiao)好(hao)的(de)(de)(de)(de)性(xing)能(neng)(neng)。無(wu)線(xian)(xian)對(dui)(dui)(dui)講(jiang)系(xi)(xi)統(tong)具有(you)(you)發(fa)射功率小、抗千擾(rao)(rao)能(neng)(neng)力(li)強(與(yu)(yu)(yu)有(you)(you)線(xian)(xian)對(dui)(dui)(dui)講(jiang)系(xi)(xi)統(tong)比較(jiao))和抗電磁干擾(rao)(rao)能(neng)(neng)力(li)強(與(yu)(yu)(yu)有(you)(you)線(xian)(xian)對(dui)(dui)(dui)講(jiang)系(xi)(xi)統(tong)比較(jiao))的(de)(de)(de)(de)特(te)點。無(wu)線(xian)(xian)對(dui)(dui)(dui)講(jiang)系(xi)(xi)統(tong)發(fa)射信號(hao)(hao)(hao)在發(fa)射前和發(fa)射后均能(neng)(neng)保(bao)持良(liang)好(hao)的(de)(de)(de)(de)性(xing)能(neng)(neng)，使(shi)用(yong)過程(cheng)中，發(fa)射信號(hao)(hao)(hao)與(yu)(yu)(yu)接收(shou)信號(hao)(hao)(hao)完全不受任何千擾(rao)(rao)，可保(bao)持很好(hao)的(de)(de)(de)(de)穩定(ding)(ding)性(xing)，具有(you)(you)良(liang)好(hao)的(de)(de)(de)(de)抗千擾(rao)(rao)性(xing)和抗低頻干擾(rao)(rao)能(neng)(neng)力(li)，即使(shi)在惡劣的(de)(de)(de)(de)環境下也(ye)能(neng)(neng)保(bao)持較(jiao)好(hao)的(de)(de)(de)(de)性(xing)能(neng)(neng)。因此無(wu)線(xian)(xian)系(xi)(xi)統(tong)有(you)(you)較(jiao)高(gao)的(de)(de)(de)(de)可靠(kao)性(xing)。

2.功耗小、不受天氣(qi)、濕度的影響

無(wu)線對講系(xi)統在(zai)不(bu)(bu)同(tong)的(de)(de)(de)環(huan)境中，無(wu)線通信(xin)設備(bei)(bei)和有線通信(xin)設備(bei)(bei)一(yi)樣都要進(jin)行電(dian)(dian)(dian)能的(de)(de)(de)消耗(hao)(hao)。當環(huan)境溫度在(zai)-40°C以下時(shi)(shi)，無(wu)線通信(xin)設備(bei)(bei)需(xu)要每(mei)天(tian)工(gong)作8小(xiao)(xiao)時(shi)(shi)左(zuo)右;當環(huan)境溫度為-20°C時(shi)(shi)，每(mei)天(tian)工(gong)作8小(xiao)(xiao)時(shi)(shi)左(zuo)右;當環(huan)境溫度為-30°C時(shi)(shi)，每(mei)天(tian)工(gong)作4小(xiao)(xiao)時(shi)(shi)左(zuo)右。目(mu)前市場(chang)上常見的(de)(de)(de)無(wu)線對講系(xi)統有兩種(zhong)(zhong)電(dian)(dian)(dian)源輸(shu)(shu)入方式，一(yi)種(zhong)(zhong)是電(dian)(dian)(dian)源輸(shu)(shu)入，另一(yi)種(zhong)(zhong)是電(dian)(dian)(dian)源輸(shu)(shu)出。從這兩種(zhong)(zhong)方式對系(xi)統的(de)(de)(de)功耗(hao)(hao)來看，電(dian)(dian)(dian)源輸(shu)(shu)入方式的(de)(de)(de)功耗(hao)(hao)更大一(yi)些，但是功耗(hao)(hao)很小(xiao)(xiao)。并且設備(bei)(bei)的(de)(de)(de)工(gong)作環(huan)境不(bu)(bu)同(tong)，對電(dian)(dian)(dian)池的(de)(de)(de)需(xu)求(qiu)量也不(bu)(bu)同(tong)，所以功耗(hao)(hao)也不(bu)(bu)同(tong)。

3信號不受干擾

在(zai)(zai)一些有(you)(you)干(gan)(gan)擾的(de)(de)(de)(de)(de)(de)地(di)方，例如(ru)野外、機場(chang)、工廠等(deng)，一般(ban)(ban)采(cai)(cai)用(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)方式。分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)方式的(de)(de)(de)(de)(de)(de)抗(kang)干(gan)(gan)擾能(neng)力(li)不強，其(qi)抗(kang)干(gan)(gan)擾能(neng)力(li)主要取決于(yu)射(she)頻(pin)(pin)(pin)(pin)(pin)(pin)功率(lv)的(de)(de)(de)(de)(de)(de)大小。分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)的(de)(de)(de)(de)(de)(de)功率(lv)一般(ban)(ban)是50dB在(zai)(zai)50dB左右(you)時，其(qi)抗(kang)干(gan)(gan)擾能(neng)力(li)強。但(dan)由于(yu)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)的(de)(de)(de)(de)(de)(de)干(gan)(gan)擾與噪聲(主要是周邊噪聲)具有(you)(you)很(hen)強的(de)(de)(de)(de)(de)(de)互通(tong)性，當分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)發射(she)的(de)(de)(de)(de)(de)(de)信(xin)(xin)(xin)號超過50dB時，其(qi)抗(kang)千(qian)擾能(neng)力(li)就會減弱。另外，在(zai)(zai)一些有(you)(you)噪音的(de)(de)(de)(de)(de)(de)環(huan)境(jing)中(zhong)使(shi)用(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)，會使(shi)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)信(xin)(xin)(xin)號無(wu)法(fa)到(dao)達發射(she)端的(de)(de)(de)(de)(de)(de)接(jie)(jie)(jie)收機或者(zhe)造成發射(she)端信(xin)(xin)(xin)號與接(jie)(jie)(jie)收端信(xin)(xin)(xin)號的(de)(de)(de)(de)(de)(de)糟合而造成分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)或干(gan)(gan)擾(例如(ru)在(zai)(zai)使(shi)用(yong)室外電話時) 。而采(cai)(cai)用(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)的(de)(de)(de)(de)(de)(de)無(wu)線對講系統由于(yu)發射(she)功率(lv)小，分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)后的(de)(de)(de)(de)(de)(de)信(xin)(xin)(xin)號強度(du)比有(you)(you)線對講系統高很(hen)多(在(zai)(zai)實(shi)際使(shi)用(yong)中(zhong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)設備一般(ban)(ban)可(ke)以將系統信(xin)(xin)(xin)號分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)到(dao)50dB以上),信(xin)(xin)(xin)號不受干(gan)(gan)擾。如(ru)果采(cai)(cai)用(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)，需要在(zai)(zai)較大的(de)(de)(de)(de)(de)(de)回波(bo)功率(lv)下才能(neng)實(shi)現(xian)信(xin)(xin)(xin)號的(de)(de)(de)(de)(de)(de)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)工作(如(ru)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)器(qi)發射(she)信(xin)(xin)(xin)號與接(jie)(jie)(jie)收信(xin)(xin)(xin)號重(zhong)疊時產生的(de)(de)(de)(de)(de)(de)千(qian)擾)和發送(song)信(xin)(xin)(xin)號強度(du)降(jiang)低(同(tong)頻(pin)(pin)(pin)(pin)(pin)(pin)帶內的(de)(de)(de)(de)(de)(de)兩只天(tian)線對同(tong)一信(xin)(xin)(xin)道傳(chuan)輸的(de)(de)(de)(de)(de)(de)信(xin)(xin)(xin)號強度(du)基本一致);如(ru)果采(cai)(cai)用(yong)混響技術(shu)，則可(ke)以實(shi)現(xian)對無(wu)線信(xin)(xin)(xin)號干(gan)(gan)擾的(de)(de)(de)(de)(de)(de)抑制或降(jiang)低。