由于在(zai)(zai)(zai)(zai)戶外(wai)(wai)、室內等區域，無(wu)(wu)線對(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)的(de)信(xin)(xin)號強度較弱，而且采用(yong)(yong)頻率調制技(ji)術（如(ru)(ru) MHZ、 NMR、 BSI等）產生(sheng)的(de)信(xin)(xin)號傳輸時延(yan)大，傳輸距(ju)離(li)遠(yuan)。因(yin)此有(you)(you)(you)線對(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)不(bu)適合在(zai)(zai)(zai)(zai)戶外(wai)(wai)環境使(shi)用(yong)(yong)，特(te)別(bie)是(shi)在(zai)(zai)(zai)(zai)冬天及低風速季(ji)節(jie)使(shi)用(yong)(yong)。雖然無(wu)(wu)線對(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)也有(you)(you)(you)著不(bu)錯的(de)效果(guo)。但由于系(xi)統(tong)(tong)(tong)工作(zuo)時會有(you)(you)(you)一(yi)定(ding)的(de)干擾(rao)，使(shi)對(dui)講(jiang)(jiang)效果(guo)下降，另外(wai)(wai)在(zai)(zai)(zai)(zai)信(xin)(xin)號較弱時對(dui)用(yong)(yong)戶語音產生(sheng)了影響。特(te)別(bie)是(shi)在(zai)(zai)(zai)(zai)人員復(fu)雜、通信(xin)(xin)距(ju)離(li)較短或需(xu)要(yao)較長時間(jian)使(shi)用(yong)(yong)時。因(yin)此，更需(xu)要(yao)有(you)(you)(you)一(yi)個可靠的(de)無(wu)(wu)線對(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)提(ti)供與有(you)(you)(you)線對(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)一(yi)樣的(de)語音信(xin)(xin)息與控(kong)制。無(wu)(wu)線對(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)具有(you)(you)(you)很高的(de)靈活(huo)性，它能(neng)夠滿足(zu)現(xian)場中所有(you)(you)(you)環境使(shi)用(yong)(yong)需(xu)求并能(neng)隨(sui)時切換(huan)（如(ru)(ru)在(zai)(zai)(zai)(zai)野外(wai)(wai)、戶外(wai)(wai)電話等),用(yong)(yong)戶可以在(zai)(zai)(zai)(zai)任何地點(dian)使(shi)用(yong)(yong)、隨(sui)時、隨(sui)地進(jin)行通訊。使(shi)用(yong)(yong)方便、節(jie)省成本、節(jie)約費用(yong)(yong)。下面我們來了解一(yi)下無(wu)(wu)線對(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)它主要(yao)是(shi)什(shen)么優點(dian)？

1.性能穩定，可(ke)靠性高

在(zai)相同無線(xian)(xian)(xian)傳(chuan)輸(shu)距離下，無線(xian)(xian)(xian)傳(chuan)輸(shu)信號(hao)(hao)更(geng)穩定由于使(shi)用了功(gong)(gong)率放大(da)器來對(dui)無線(xian)(xian)(xian)信號(hao)(hao)進(jin)行壓(ya)縮(suo)和(he)放大(da)，使(shi)無線(xian)(xian)(xian)信號(hao)(hao)更(geng)加穩定可(ke)靠。無線(xian)(xian)(xian)信號(hao)(hao)在(zai)弱電(dian)(dian)磁環境下也(ye)(ye)能保持較好(hao)的(de)性(xing)(xing)能。無線(xian)(xian)(xian)對(dui)講(jiang)系統(tong)具(ju)有(you)(you)發射功(gong)(gong)率小、抗千(qian)(qian)擾(rao)能力強(qiang)(與(yu)有(you)(you)線(xian)(xian)(xian)對(dui)講(jiang)系統(tong)比較)和(he)抗電(dian)(dian)磁干擾(rao)能力強(qiang)(與(yu)有(you)(you)線(xian)(xian)(xian)對(dui)講(jiang)系統(tong)比較)的(de)特點(dian)。無線(xian)(xian)(xian)對(dui)講(jiang)系統(tong)發射信號(hao)(hao)在(zai)發射前(qian)和(he)發射后均能保持良好(hao)的(de)性(xing)(xing)能，使(shi)用過程中，發射信號(hao)(hao)與(yu)接收信號(hao)(hao)完全不受任何千(qian)(qian)擾(rao)，可(ke)保持很好(hao)的(de)穩定性(xing)(xing)，具(ju)有(you)(you)良好(hao)的(de)抗千(qian)(qian)擾(rao)性(xing)(xing)和(he)抗低頻干擾(rao)能力，即(ji)使(shi)在(zai)惡劣的(de)環境下也(ye)(ye)能保持較好(hao)的(de)性(xing)(xing)能。因此(ci)無線(xian)(xian)(xian)系統(tong)有(you)(you)較高(gao)的(de)可(ke)靠性(xing)(xing)。

2.功耗(hao)小(xiao)、不受天氣、濕度的影響

無(wu)線(xian)對(dui)講系統在不(bu)(bu)同(tong)的(de)(de)(de)環(huan)(huan)境中，無(wu)線(xian)通(tong)信設備(bei)(bei)和有線(xian)通(tong)信設備(bei)(bei)一樣都要(yao)進行電(dian)能的(de)(de)(de)消耗。當環(huan)(huan)境溫(wen)度(du)在-40°C以(yi)下(xia)時(shi)，無(wu)線(xian)通(tong)信設備(bei)(bei)需要(yao)每天工(gong)作8小(xiao)時(shi)左(zuo)右(you);當環(huan)(huan)境溫(wen)度(du)為-20°C時(shi)，每天工(gong)作8小(xiao)時(shi)左(zuo)右(you);當環(huan)(huan)境溫(wen)度(du)為-30°C時(shi)，每天工(gong)作4小(xiao)時(shi)左(zuo)右(you)。目前市(shi)場上常見的(de)(de)(de)無(wu)線(xian)對(dui)講系統有兩種電(dian)源(yuan)輸入(ru)方式，一種是(shi)(shi)電(dian)源(yuan)輸入(ru)，另一種是(shi)(shi)電(dian)源(yuan)輸出(chu)。從這(zhe)兩種方式對(dui)系統的(de)(de)(de)功耗來(lai)看，電(dian)源(yuan)輸入(ru)方式的(de)(de)(de)功耗更大一些，但是(shi)(shi)功耗很小(xiao)。并且設備(bei)(bei)的(de)(de)(de)工(gong)作環(huan)(huan)境不(bu)(bu)同(tong)，對(dui)電(dian)池的(de)(de)(de)需求量也不(bu)(bu)同(tong)，所以(yi)功耗也不(bu)(bu)同(tong)。

3信號不受干擾

在一些有干(gan)擾(rao)(rao)的(de)(de)(de)(de)(de)地方，例如(ru)野外(wai)、機場、工廠等(deng)，一般(ban)采用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)方式。分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)方式的(de)(de)(de)(de)(de)抗(kang)干(gan)擾(rao)(rao)能(neng)(neng)力不(bu)強，其抗(kang)干(gan)擾(rao)(rao)能(neng)(neng)力主要取決于(yu)(yu)射(she)頻(pin)(pin)功(gong)率的(de)(de)(de)(de)(de)大小。分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)技(ji)術的(de)(de)(de)(de)(de)功(gong)率一般(ban)是50dB在50dB左右時(shi)，其抗(kang)干(gan)擾(rao)(rao)能(neng)(neng)力強。但由于(yu)(yu)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)的(de)(de)(de)(de)(de)干(gan)擾(rao)(rao)與噪聲(sheng)(主要是周邊噪聲(sheng))具有很(hen)強的(de)(de)(de)(de)(de)互(hu)通(tong)性，當分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)發(fa)射(she)的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)超過(guo)50dB時(shi)，其抗(kang)千擾(rao)(rao)能(neng)(neng)力就會減弱。另(ling)外(wai)，在一些有噪音(yin)的(de)(de)(de)(de)(de)環境中(zhong)使用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)技(ji)術，會使分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)信(xin)(xin)(xin)(xin)號(hao)無法(fa)到達發(fa)射(she)端的(de)(de)(de)(de)(de)接收(shou)機或者造成發(fa)射(she)端信(xin)(xin)(xin)(xin)號(hao)與接收(shou)端信(xin)(xin)(xin)(xin)號(hao)的(de)(de)(de)(de)(de)糟(zao)合而造成分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)或干(gan)擾(rao)(rao)(例如(ru)在使用(yong)(yong)室外(wai)電話時(shi)) 。而采用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)技(ji)術的(de)(de)(de)(de)(de)無線(xian)對講(jiang)(jiang)系統由于(yu)(yu)發(fa)射(she)功(gong)率小，分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)后的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)強度(du)比有線(xian)對講(jiang)(jiang)系統高很(hen)多(在實(shi)(shi)際(ji)使用(yong)(yong)中(zhong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)設(she)備一般(ban)可以(yi)將(jiang)系統信(xin)(xin)(xin)(xin)號(hao)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)到50dB以(yi)上),信(xin)(xin)(xin)(xin)號(hao)不(bu)受(shou)干(gan)擾(rao)(rao)。如(ru)果采用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)技(ji)術，需要在較大的(de)(de)(de)(de)(de)回(hui)波功(gong)率下才能(neng)(neng)實(shi)(shi)現信(xin)(xin)(xin)(xin)號(hao)的(de)(de)(de)(de)(de)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)工作(如(ru)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)器(qi)發(fa)射(she)信(xin)(xin)(xin)(xin)號(hao)與接收(shou)信(xin)(xin)(xin)(xin)號(hao)重疊時(shi)產生的(de)(de)(de)(de)(de)千擾(rao)(rao))和發(fa)送信(xin)(xin)(xin)(xin)號(hao)強度(du)降(jiang)(jiang)低(同頻(pin)(pin)帶(dai)內(nei)的(de)(de)(de)(de)(de)兩(liang)只天(tian)線(xian)對同一信(xin)(xin)(xin)(xin)道傳(chuan)輸的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)強度(du)基本一致);如(ru)果采用(yong)(yong)混響技(ji)術，則可以(yi)實(shi)(shi)現對無線(xian)信(xin)(xin)(xin)(xin)號(hao)干(gan)擾(rao)(rao)的(de)(de)(de)(de)(de)抑制或降(jiang)(jiang)低。