由于(yu)在(zai)(zai)戶(hu)外、室內等(deng)區(qu)域，無(wu)線(xian)對(dui)講(jiang)(jiang)(jiang)系(xi)(xi)(xi)統(tong)的(de)(de)(de)信號強度較(jiao)弱，而且采(cai)用(yong)(yong)(yong)(yong)頻率調(diao)制技(ji)術（如 MHZ、 NMR、 BSI等(deng)）產生的(de)(de)(de)信號傳輸時(shi)延大(da)，傳輸距離遠。因此有(you)線(xian)對(dui)講(jiang)(jiang)(jiang)系(xi)(xi)(xi)統(tong)不適(shi)合在(zai)(zai)戶(hu)外環(huan)境使用(yong)(yong)(yong)(yong)，特(te)別是(shi)(shi)在(zai)(zai)冬天及低風速季節使用(yong)(yong)(yong)(yong)。雖(sui)然無(wu)線(xian)對(dui)講(jiang)(jiang)(jiang)系(xi)(xi)(xi)統(tong)也有(you)著不錯(cuo)的(de)(de)(de)效果。但由于(yu)系(xi)(xi)(xi)統(tong)工(gong)作時(shi)會有(you)一(yi)定的(de)(de)(de)干擾，使對(dui)講(jiang)(jiang)(jiang)效果下(xia)(xia)降，另外在(zai)(zai)信號較(jiao)弱時(shi)對(dui)用(yong)(yong)(yong)(yong)戶(hu)語(yu)音產生了影響。特(te)別是(shi)(shi)在(zai)(zai)人員復雜、通信距離較(jiao)短或需(xu)要(yao)較(jiao)長時(shi)間使用(yong)(yong)(yong)(yong)時(shi)。因此，更需(xu)要(yao)有(you)一(yi)個(ge)可(ke)靠(kao)的(de)(de)(de)無(wu)線(xian)對(dui)講(jiang)(jiang)(jiang)系(xi)(xi)(xi)統(tong)提供(gong)與有(you)線(xian)對(dui)講(jiang)(jiang)(jiang)系(xi)(xi)(xi)統(tong)一(yi)樣的(de)(de)(de)語(yu)音信息與控制。無(wu)線(xian)對(dui)講(jiang)(jiang)(jiang)系(xi)(xi)(xi)統(tong)具有(you)很高的(de)(de)(de)靈活(huo)性，它(ta)能夠滿足現場中所有(you)環(huan)境使用(yong)(yong)(yong)(yong)需(xu)求并能隨時(shi)切(qie)換（如在(zai)(zai)野外、戶(hu)外電話等(deng)),用(yong)(yong)(yong)(yong)戶(hu)可(ke)以在(zai)(zai)任何地點使用(yong)(yong)(yong)(yong)、隨時(shi)、隨地進行通訊。使用(yong)(yong)(yong)(yong)方(fang)便、節省成本、節約費用(yong)(yong)(yong)(yong)。下(xia)(xia)面我們來了解一(yi)下(xia)(xia)無(wu)線(xian)對(dui)講(jiang)(jiang)(jiang)系(xi)(xi)(xi)統(tong)它(ta)主要(yao)是(shi)(shi)什么優點？

1.性(xing)能穩(wen)定(ding)，可靠(kao)性(xing)高

在相同無(wu)線(xian)(xian)傳輸距(ju)離(li)下，無(wu)線(xian)(xian)傳輸信(xin)號(hao)(hao)(hao)更穩定由(you)于使用(yong)了(le)功(gong)率放(fang)大(da)器來對(dui)無(wu)線(xian)(xian)信(xin)號(hao)(hao)(hao)進行(xing)壓縮和(he)(he)放(fang)大(da)，使無(wu)線(xian)(xian)信(xin)號(hao)(hao)(hao)更加穩定可(ke)靠。無(wu)線(xian)(xian)信(xin)號(hao)(hao)(hao)在弱(ruo)電(dian)磁環境下也能(neng)(neng)保持(chi)較好(hao)的(de)(de)(de)性(xing)(xing)(xing)(xing)能(neng)(neng)。無(wu)線(xian)(xian)對(dui)講系統(tong)具有(you)發射(she)功(gong)率小、抗千(qian)擾(rao)(rao)能(neng)(neng)力(li)(li)(li)強(與有(you)線(xian)(xian)對(dui)講系統(tong)比較)和(he)(he)抗電(dian)磁干擾(rao)(rao)能(neng)(neng)力(li)(li)(li)強(與有(you)線(xian)(xian)對(dui)講系統(tong)比較)的(de)(de)(de)特點。無(wu)線(xian)(xian)對(dui)講系統(tong)發射(she)信(xin)號(hao)(hao)(hao)在發射(she)前和(he)(he)發射(she)后均能(neng)(neng)保持(chi)良好(hao)的(de)(de)(de)性(xing)(xing)(xing)(xing)能(neng)(neng)，使用(yong)過程中，發射(she)信(xin)號(hao)(hao)(hao)與接收信(xin)號(hao)(hao)(hao)完全不受任何千(qian)擾(rao)(rao)，可(ke)保持(chi)很好(hao)的(de)(de)(de)穩定性(xing)(xing)(xing)(xing)，具有(you)良好(hao)的(de)(de)(de)抗千(qian)擾(rao)(rao)性(xing)(xing)(xing)(xing)和(he)(he)抗低(di)頻干擾(rao)(rao)能(neng)(neng)力(li)(li)(li)，即使在惡劣的(de)(de)(de)環境下也能(neng)(neng)保持(chi)較好(hao)的(de)(de)(de)性(xing)(xing)(xing)(xing)能(neng)(neng)。因此無(wu)線(xian)(xian)系統(tong)有(you)較高的(de)(de)(de)可(ke)靠性(xing)(xing)(xing)(xing)。

2.功耗小、不受天(tian)氣、濕(shi)度的影響

無線(xian)(xian)對(dui)講系統在(zai)不(bu)同的環(huan)(huan)境(jing)中(zhong)，無線(xian)(xian)通信設(she)備和有(you)線(xian)(xian)通信設(she)備一(yi)(yi)樣都要(yao)進(jin)行電(dian)(dian)能的消耗(hao)。當(dang)(dang)環(huan)(huan)境(jing)溫度(du)在(zai)-40°C以下時，無線(xian)(xian)通信設(she)備需要(yao)每(mei)(mei)天(tian)工(gong)作8小時左右;當(dang)(dang)環(huan)(huan)境(jing)溫度(du)為-20°C時，每(mei)(mei)天(tian)工(gong)作8小時左右;當(dang)(dang)環(huan)(huan)境(jing)溫度(du)為-30°C時，每(mei)(mei)天(tian)工(gong)作4小時左右。目前(qian)市場上常(chang)見的無線(xian)(xian)對(dui)講系統有(you)兩種(zhong)電(dian)(dian)源輸入(ru)方(fang)式(shi)，一(yi)(yi)種(zhong)是(shi)電(dian)(dian)源輸入(ru)，另一(yi)(yi)種(zhong)是(shi)電(dian)(dian)源輸出。從(cong)這兩種(zhong)方(fang)式(shi)對(dui)系統的功耗(hao)來看，電(dian)(dian)源輸入(ru)方(fang)式(shi)的功耗(hao)更(geng)大一(yi)(yi)些，但(dan)是(shi)功耗(hao)很小。并(bing)且設(she)備的工(gong)作環(huan)(huan)境(jing)不(bu)同，對(dui)電(dian)(dian)池的需求(qiu)量也(ye)(ye)不(bu)同，所以功耗(hao)也(ye)(ye)不(bu)同。

3信號不受干擾

在一(yi)些(xie)(xie)有(you)(you)干擾(rao)(rao)(rao)(rao)(rao)的(de)(de)(de)(de)(de)(de)(de)地(di)方(fang)，例如(ru)(ru)野(ye)外(wai)、機(ji)場(chang)、工廠等，一(yi)般(ban)采用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)方(fang)式(shi)。分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)方(fang)式(shi)的(de)(de)(de)(de)(de)(de)(de)抗(kang)干擾(rao)(rao)(rao)(rao)(rao)能力(li)不(bu)強(qiang)(qiang)，其(qi)抗(kang)干擾(rao)(rao)(rao)(rao)(rao)能力(li)主(zhu)要(yao)取(qu)決于射頻(pin)(pin)(pin)(pin)功(gong)率的(de)(de)(de)(de)(de)(de)(de)大(da)小。分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)術(shu)(shu)的(de)(de)(de)(de)(de)(de)(de)功(gong)率一(yi)般(ban)是(shi)50dB在50dB左右時，其(qi)抗(kang)干擾(rao)(rao)(rao)(rao)(rao)能力(li)強(qiang)(qiang)。但由(you)于分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)的(de)(de)(de)(de)(de)(de)(de)干擾(rao)(rao)(rao)(rao)(rao)與噪(zao)聲(sheng)(主(zhu)要(yao)是(shi)周邊噪(zao)聲(sheng))具有(you)(you)很強(qiang)(qiang)的(de)(de)(de)(de)(de)(de)(de)互(hu)通(tong)性，當分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)發(fa)射的(de)(de)(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)超過50dB時，其(qi)抗(kang)千擾(rao)(rao)(rao)(rao)(rao)能力(li)就會(hui)減弱。另外(wai)，在一(yi)些(xie)(xie)有(you)(you)噪(zao)音的(de)(de)(de)(de)(de)(de)(de)環境中使(shi)用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)術(shu)(shu)，會(hui)使(shi)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)信(xin)(xin)(xin)(xin)號(hao)(hao)無(wu)法到(dao)達(da)發(fa)射端的(de)(de)(de)(de)(de)(de)(de)接(jie)收機(ji)或者(zhe)造成(cheng)發(fa)射端信(xin)(xin)(xin)(xin)號(hao)(hao)與接(jie)收端信(xin)(xin)(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)(de)(de)(de)糟(zao)合而造成(cheng)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)或干擾(rao)(rao)(rao)(rao)(rao)(例如(ru)(ru)在使(shi)用(yong)(yong)室外(wai)電話時) 。而采用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)術(shu)(shu)的(de)(de)(de)(de)(de)(de)(de)無(wu)線對講系統(tong)由(you)于發(fa)射功(gong)率小，分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)后的(de)(de)(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)強(qiang)(qiang)度(du)(du)比(bi)有(you)(you)線對講系統(tong)高很多(在實(shi)(shi)際使(shi)用(yong)(yong)中分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)設備(bei)一(yi)般(ban)可(ke)以(yi)將(jiang)系統(tong)信(xin)(xin)(xin)(xin)號(hao)(hao)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)到(dao)50dB以(yi)上),信(xin)(xin)(xin)(xin)號(hao)(hao)不(bu)受干擾(rao)(rao)(rao)(rao)(rao)。如(ru)(ru)果采用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)術(shu)(shu)，需要(yao)在較大(da)的(de)(de)(de)(de)(de)(de)(de)回(hui)波功(gong)率下才能實(shi)(shi)現(xian)信(xin)(xin)(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)(de)(de)(de)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)工作(如(ru)(ru)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)器(qi)發(fa)射信(xin)(xin)(xin)(xin)號(hao)(hao)與接(jie)收信(xin)(xin)(xin)(xin)號(hao)(hao)重疊(die)時產生的(de)(de)(de)(de)(de)(de)(de)千擾(rao)(rao)(rao)(rao)(rao))和發(fa)送信(xin)(xin)(xin)(xin)號(hao)(hao)強(qiang)(qiang)度(du)(du)降(jiang)低(同(tong)頻(pin)(pin)(pin)(pin)帶內的(de)(de)(de)(de)(de)(de)(de)兩只天(tian)線對同(tong)一(yi)信(xin)(xin)(xin)(xin)道傳輸的(de)(de)(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)強(qiang)(qiang)度(du)(du)基(ji)本一(yi)致);如(ru)(ru)果采用(yong)(yong)混響(xiang)技(ji)術(shu)(shu)，則可(ke)以(yi)實(shi)(shi)現(xian)對無(wu)線信(xin)(xin)(xin)(xin)號(hao)(hao)干擾(rao)(rao)(rao)(rao)(rao)的(de)(de)(de)(de)(de)(de)(de)抑制(zhi)或降(jiang)低。