由于在戶(hu)外(wai)(wai)、室內(nei)等區域(yu)，無(wu)線(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)系(xi)(xi)(xi)統的(de)信(xin)(xin)號強(qiang)度較(jiao)弱，而(er)且采用(yong)(yong)(yong)頻率調制技術（如 MHZ、 NMR、 BSI等）產(chan)生(sheng)的(de)信(xin)(xin)號傳輸(shu)時延(yan)大，傳輸(shu)距離遠。因(yin)此有(you)線(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)系(xi)(xi)(xi)統不適合(he)在戶(hu)外(wai)(wai)環境(jing)(jing)使(shi)(shi)用(yong)(yong)(yong)，特別(bie)是在冬天(tian)及低(di)風速季節(jie)(jie)使(shi)(shi)用(yong)(yong)(yong)。雖然無(wu)線(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)系(xi)(xi)(xi)統也(ye)有(you)著不錯的(de)效(xiao)果(guo)(guo)。但(dan)由于系(xi)(xi)(xi)統工作時會(hui)有(you)一(yi)定的(de)干擾(rao)，使(shi)(shi)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)效(xiao)果(guo)(guo)下(xia)降(jiang)，另外(wai)(wai)在信(xin)(xin)號較(jiao)弱時對(dui)(dui)用(yong)(yong)(yong)戶(hu)語(yu)音產(chan)生(sheng)了影響。特別(bie)是在人員復雜、通信(xin)(xin)距離較(jiao)短或需(xu)要(yao)較(jiao)長時間使(shi)(shi)用(yong)(yong)(yong)時。因(yin)此，更(geng)需(xu)要(yao)有(you)一(yi)個可(ke)靠的(de)無(wu)線(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)系(xi)(xi)(xi)統提供(gong)與(yu)有(you)線(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)系(xi)(xi)(xi)統一(yi)樣的(de)語(yu)音信(xin)(xin)息與(yu)控制。無(wu)線(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)系(xi)(xi)(xi)統具有(you)很高(gao)的(de)靈活性(xing)，它能(neng)(neng)夠滿足現場中所有(you)環境(jing)(jing)使(shi)(shi)用(yong)(yong)(yong)需(xu)求并能(neng)(neng)隨(sui)時切(qie)換（如在野外(wai)(wai)、戶(hu)外(wai)(wai)電話等),用(yong)(yong)(yong)戶(hu)可(ke)以在任何地點使(shi)(shi)用(yong)(yong)(yong)、隨(sui)時、隨(sui)地進行(xing)通訊。使(shi)(shi)用(yong)(yong)(yong)方便、節(jie)(jie)省成本、節(jie)(jie)約費(fei)用(yong)(yong)(yong)。下(xia)面我們來了解一(yi)下(xia)無(wu)線(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)系(xi)(xi)(xi)統它主要(yao)是什么優點？

1.性能(neng)穩定，可靠性高

在相(xiang)同無(wu)線(xian)(xian)傳(chuan)輸距(ju)離下(xia)，無(wu)線(xian)(xian)傳(chuan)輸信(xin)號更(geng)穩定由于使用了功率(lv)放(fang)大器(qi)來對(dui)(dui)無(wu)線(xian)(xian)信(xin)號進行壓縮和放(fang)大，使無(wu)線(xian)(xian)信(xin)號更(geng)加(jia)穩定可靠(kao)。無(wu)線(xian)(xian)信(xin)號在弱(ruo)電磁(ci)環境下(xia)也能(neng)保(bao)持較(jiao)好(hao)(hao)的(de)(de)(de)(de)性(xing)(xing)(xing)能(neng)。無(wu)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)統(tong)(tong)具有(you)(you)發射(she)功率(lv)小、抗(kang)(kang)(kang)千(qian)擾能(neng)力強(與有(you)(you)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)統(tong)(tong)比(bi)較(jiao))和抗(kang)(kang)(kang)電磁(ci)干擾能(neng)力強(與有(you)(you)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)統(tong)(tong)比(bi)較(jiao))的(de)(de)(de)(de)特點。無(wu)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)統(tong)(tong)發射(she)信(xin)號在發射(she)前(qian)和發射(she)后(hou)均能(neng)保(bao)持良好(hao)(hao)的(de)(de)(de)(de)性(xing)(xing)(xing)能(neng)，使用過程中(zhong)，發射(she)信(xin)號與接收(shou)信(xin)號完全(quan)不受任何千(qian)擾，可保(bao)持很好(hao)(hao)的(de)(de)(de)(de)穩定性(xing)(xing)(xing)，具有(you)(you)良好(hao)(hao)的(de)(de)(de)(de)抗(kang)(kang)(kang)千(qian)擾性(xing)(xing)(xing)和抗(kang)(kang)(kang)低(di)頻(pin)干擾能(neng)力，即(ji)使在惡劣的(de)(de)(de)(de)環境下(xia)也能(neng)保(bao)持較(jiao)好(hao)(hao)的(de)(de)(de)(de)性(xing)(xing)(xing)能(neng)。因此無(wu)線(xian)(xian)系(xi)(xi)統(tong)(tong)有(you)(you)較(jiao)高的(de)(de)(de)(de)可靠(kao)性(xing)(xing)(xing)。

2.功耗小(xiao)、不受(shou)天氣、濕(shi)度的影響

無線(xian)(xian)對講系(xi)統在不(bu)同的(de)環境(jing)(jing)(jing)中(zhong)，無線(xian)(xian)通(tong)信(xin)設備和有線(xian)(xian)通(tong)信(xin)設備一樣(yang)都要進(jin)行電能的(de)消耗。當環境(jing)(jing)(jing)溫(wen)(wen)度在-40°C以下時(shi)(shi)(shi)(shi)，無線(xian)(xian)通(tong)信(xin)設備需(xu)要每天(tian)(tian)工作(zuo)8小(xiao)(xiao)時(shi)(shi)(shi)(shi)左(zuo)右(you);當環境(jing)(jing)(jing)溫(wen)(wen)度為(wei)-20°C時(shi)(shi)(shi)(shi)，每天(tian)(tian)工作(zuo)8小(xiao)(xiao)時(shi)(shi)(shi)(shi)左(zuo)右(you);當環境(jing)(jing)(jing)溫(wen)(wen)度為(wei)-30°C時(shi)(shi)(shi)(shi)，每天(tian)(tian)工作(zuo)4小(xiao)(xiao)時(shi)(shi)(shi)(shi)左(zuo)右(you)。目前市(shi)場上常見的(de)無線(xian)(xian)對講系(xi)統有兩種(zhong)電源輸(shu)入方(fang)(fang)式，一種(zhong)是(shi)(shi)(shi)電源輸(shu)入，另(ling)一種(zhong)是(shi)(shi)(shi)電源輸(shu)出。從(cong)這兩種(zhong)方(fang)(fang)式對系(xi)統的(de)功(gong)耗來看(kan)，電源輸(shu)入方(fang)(fang)式的(de)功(gong)耗更(geng)大一些，但是(shi)(shi)(shi)功(gong)耗很小(xiao)(xiao)。并且設備的(de)工作(zuo)環境(jing)(jing)(jing)不(bu)同，對電池(chi)的(de)需(xu)求量也(ye)不(bu)同，所以功(gong)耗也(ye)不(bu)同。

3信號不受干擾

在一(yi)(yi)些(xie)有(you)干(gan)(gan)擾(rao)(rao)的地方，例(li)如(ru)(ru)野(ye)外(wai)、機場、工(gong)廠等，一(yi)(yi)般采(cai)用(yong)分(fen)(fen)(fen)頻(pin)(pin)方式(shi)(shi)。分(fen)(fen)(fen)頻(pin)(pin)方式(shi)(shi)的抗干(gan)(gan)擾(rao)(rao)能(neng)力(li)(li)不(bu)強，其(qi)(qi)抗干(gan)(gan)擾(rao)(rao)能(neng)力(li)(li)主(zhu)要(yao)取決于(yu)(yu)射(she)頻(pin)(pin)功(gong)率的大(da)小(xiao)。分(fen)(fen)(fen)頻(pin)(pin)技(ji)術的功(gong)率一(yi)(yi)般是(shi)50dB在50dB左右時，其(qi)(qi)抗干(gan)(gan)擾(rao)(rao)能(neng)力(li)(li)強。但由(you)于(yu)(yu)分(fen)(fen)(fen)頻(pin)(pin)的干(gan)(gan)擾(rao)(rao)與(yu)噪(zao)(zao)聲(sheng)(sheng)(主(zhu)要(yao)是(shi)周邊噪(zao)(zao)聲(sheng)(sheng))具有(you)很(hen)強的互通性，當分(fen)(fen)(fen)頻(pin)(pin)發(fa)(fa)射(she)的信(xin)(xin)(xin)號(hao)超過(guo)50dB時，其(qi)(qi)抗千擾(rao)(rao)能(neng)力(li)(li)就會減弱。另外(wai)，在一(yi)(yi)些(xie)有(you)噪(zao)(zao)音的環境中(zhong)使用(yong)分(fen)(fen)(fen)頻(pin)(pin)技(ji)術，會使分(fen)(fen)(fen)頻(pin)(pin)信(xin)(xin)(xin)號(hao)無(wu)法到達發(fa)(fa)射(she)端的接(jie)收(shou)機或(huo)(huo)者造成發(fa)(fa)射(she)端信(xin)(xin)(xin)號(hao)與(yu)接(jie)收(shou)端信(xin)(xin)(xin)號(hao)的糟合(he)而造成分(fen)(fen)(fen)頻(pin)(pin)或(huo)(huo)干(gan)(gan)擾(rao)(rao)(例(li)如(ru)(ru)在使用(yong)室外(wai)電話時) 。而采(cai)用(yong)分(fen)(fen)(fen)頻(pin)(pin)技(ji)術的無(wu)線對(dui)講系(xi)統由(you)于(yu)(yu)發(fa)(fa)射(she)功(gong)率小(xiao)，分(fen)(fen)(fen)頻(pin)(pin)后的信(xin)(xin)(xin)號(hao)強度(du)(du)比有(you)線對(dui)講系(xi)統高很(hen)多(在實(shi)(shi)際使用(yong)中(zhong)分(fen)(fen)(fen)頻(pin)(pin)設(she)備一(yi)(yi)般可以將系(xi)統信(xin)(xin)(xin)號(hao)分(fen)(fen)(fen)頻(pin)(pin)到50dB以上),信(xin)(xin)(xin)號(hao)不(bu)受(shou)干(gan)(gan)擾(rao)(rao)。如(ru)(ru)果采(cai)用(yong)分(fen)(fen)(fen)頻(pin)(pin)技(ji)術，需要(yao)在較大(da)的回波(bo)功(gong)率下才能(neng)實(shi)(shi)現(xian)信(xin)(xin)(xin)號(hao)的分(fen)(fen)(fen)頻(pin)(pin)工(gong)作(如(ru)(ru)分(fen)(fen)(fen)頻(pin)(pin)器發(fa)(fa)射(she)信(xin)(xin)(xin)號(hao)與(yu)接(jie)收(shou)信(xin)(xin)(xin)號(hao)重疊時產(chan)生(sheng)的千擾(rao)(rao))和發(fa)(fa)送信(xin)(xin)(xin)號(hao)強度(du)(du)降低(同(tong)頻(pin)(pin)帶內的兩只天(tian)線對(dui)同(tong)一(yi)(yi)信(xin)(xin)(xin)道傳(chuan)輸(shu)的信(xin)(xin)(xin)號(hao)強度(du)(du)基本一(yi)(yi)致);如(ru)(ru)果采(cai)用(yong)混(hun)響技(ji)術，則可以實(shi)(shi)現(xian)對(dui)無(wu)線信(xin)(xin)(xin)號(hao)干(gan)(gan)擾(rao)(rao)的抑制或(huo)(huo)降低。