由于(yu)(yu)在(zai)(zai)戶外、室內等區域，無(wu)線(xian)對(dui)(dui)(dui)講(jiang)系(xi)統(tong)(tong)的信(xin)(xin)號(hao)(hao)強(qiang)度較弱(ruo)，而且采用(yong)(yong)頻率調制技(ji)術(shu)（如(ru) MHZ、 NMR、 BSI等）產生的信(xin)(xin)號(hao)(hao)傳輸時(shi)(shi)延大，傳輸距離遠。因此有(you)(you)線(xian)對(dui)(dui)(dui)講(jiang)系(xi)統(tong)(tong)不適合在(zai)(zai)戶外環(huan)境使(shi)用(yong)(yong)，特別是在(zai)(zai)冬天及(ji)低(di)風速季節使(shi)用(yong)(yong)。雖然(ran)無(wu)線(xian)對(dui)(dui)(dui)講(jiang)系(xi)統(tong)(tong)也有(you)(you)著不錯(cuo)的效(xiao)果(guo)。但由于(yu)(yu)系(xi)統(tong)(tong)工作(zuo)時(shi)(shi)會有(you)(you)一定的干擾，使(shi)對(dui)(dui)(dui)講(jiang)效(xiao)果(guo)下降，另外在(zai)(zai)信(xin)(xin)號(hao)(hao)較弱(ruo)時(shi)(shi)對(dui)(dui)(dui)用(yong)(yong)戶語音產生了影響。特別是在(zai)(zai)人員復雜(za)、通信(xin)(xin)距離較短或需(xu)要(yao)較長時(shi)(shi)間使(shi)用(yong)(yong)時(shi)(shi)。因此，更需(xu)要(yao)有(you)(you)一個(ge)可靠的無(wu)線(xian)對(dui)(dui)(dui)講(jiang)系(xi)統(tong)(tong)提供與有(you)(you)線(xian)對(dui)(dui)(dui)講(jiang)系(xi)統(tong)(tong)一樣的語音信(xin)(xin)息與控制。無(wu)線(xian)對(dui)(dui)(dui)講(jiang)系(xi)統(tong)(tong)具有(you)(you)很高的靈活性，它(ta)能夠滿足現場中所有(you)(you)環(huan)境使(shi)用(yong)(yong)需(xu)求并能隨時(shi)(shi)切換（如(ru)在(zai)(zai)野外、戶外電話(hua)等),用(yong)(yong)戶可以在(zai)(zai)任何地點使(shi)用(yong)(yong)、隨時(shi)(shi)、隨地進行通訊(xun)。使(shi)用(yong)(yong)方便、節省成(cheng)本、節約費用(yong)(yong)。下面(mian)我們來了解一下無(wu)線(xian)對(dui)(dui)(dui)講(jiang)系(xi)統(tong)(tong)它(ta)主要(yao)是什么(me)優點？

1.性(xing)能穩定，可靠性(xing)高

在相同(tong)無(wu)(wu)線(xian)(xian)(xian)傳輸距(ju)離下(xia)，無(wu)(wu)線(xian)(xian)(xian)傳輸信號(hao)(hao)更穩定(ding)由于使用(yong)了功(gong)(gong)率放(fang)大器來對(dui)無(wu)(wu)線(xian)(xian)(xian)信號(hao)(hao)進行壓縮和放(fang)大，使無(wu)(wu)線(xian)(xian)(xian)信號(hao)(hao)更加穩定(ding)可(ke)(ke)靠。無(wu)(wu)線(xian)(xian)(xian)信號(hao)(hao)在弱電磁環境(jing)下(xia)也能(neng)(neng)保持(chi)(chi)較(jiao)(jiao)好(hao)(hao)的性(xing)能(neng)(neng)。無(wu)(wu)線(xian)(xian)(xian)對(dui)講(jiang)系統(tong)(tong)具(ju)(ju)有(you)發(fa)射(she)功(gong)(gong)率小、抗(kang)千(qian)擾(rao)(rao)(rao)(rao)能(neng)(neng)力強(與(yu)有(you)線(xian)(xian)(xian)對(dui)講(jiang)系統(tong)(tong)比較(jiao)(jiao))和抗(kang)電磁干(gan)(gan)擾(rao)(rao)(rao)(rao)能(neng)(neng)力強(與(yu)有(you)線(xian)(xian)(xian)對(dui)講(jiang)系統(tong)(tong)比較(jiao)(jiao))的特(te)點。無(wu)(wu)線(xian)(xian)(xian)對(dui)講(jiang)系統(tong)(tong)發(fa)射(she)信號(hao)(hao)在發(fa)射(she)前和發(fa)射(she)后均能(neng)(neng)保持(chi)(chi)良(liang)好(hao)(hao)的性(xing)能(neng)(neng)，使用(yong)過程中，發(fa)射(she)信號(hao)(hao)與(yu)接收信號(hao)(hao)完(wan)全不受任何千(qian)擾(rao)(rao)(rao)(rao)，可(ke)(ke)保持(chi)(chi)很好(hao)(hao)的穩定(ding)性(xing)，具(ju)(ju)有(you)良(liang)好(hao)(hao)的抗(kang)千(qian)擾(rao)(rao)(rao)(rao)性(xing)和抗(kang)低頻干(gan)(gan)擾(rao)(rao)(rao)(rao)能(neng)(neng)力，即使在惡劣的環境(jing)下(xia)也能(neng)(neng)保持(chi)(chi)較(jiao)(jiao)好(hao)(hao)的性(xing)能(neng)(neng)。因此無(wu)(wu)線(xian)(xian)(xian)系統(tong)(tong)有(you)較(jiao)(jiao)高的可(ke)(ke)靠性(xing)。

2.功耗小(xiao)、不(bu)受天氣、濕(shi)度的(de)影響(xiang)

無線(xian)對講系統(tong)在不(bu)(bu)(bu)同(tong)(tong)的環境(jing)(jing)(jing)中(zhong)，無線(xian)通(tong)信(xin)設備和有線(xian)通(tong)信(xin)設備一(yi)樣都要進行電能的消耗(hao)(hao)。當環境(jing)(jing)(jing)溫度在-40°C以下時(shi)(shi)，無線(xian)通(tong)信(xin)設備需要每(mei)天工作8小(xiao)(xiao)時(shi)(shi)左右(you);當環境(jing)(jing)(jing)溫度為-20°C時(shi)(shi)，每(mei)天工作8小(xiao)(xiao)時(shi)(shi)左右(you);當環境(jing)(jing)(jing)溫度為-30°C時(shi)(shi)，每(mei)天工作4小(xiao)(xiao)時(shi)(shi)左右(you)。目前(qian)市(shi)場上常見的無線(xian)對講系統(tong)有兩種電源輸(shu)入方式(shi)，一(yi)種是電源輸(shu)入，另一(yi)種是電源輸(shu)出。從這(zhe)兩種方式(shi)對系統(tong)的功(gong)耗(hao)(hao)來看，電源輸(shu)入方式(shi)的功(gong)耗(hao)(hao)更大一(yi)些，但是功(gong)耗(hao)(hao)很(hen)小(xiao)(xiao)。并且設備的工作環境(jing)(jing)(jing)不(bu)(bu)(bu)同(tong)(tong)，對電池的需求(qiu)量也(ye)不(bu)(bu)(bu)同(tong)(tong)，所以功(gong)耗(hao)(hao)也(ye)不(bu)(bu)(bu)同(tong)(tong)。

3信號不受干擾

在(zai)一(yi)些(xie)有(you)(you)干(gan)擾(rao)的地方，例(li)如(ru)野(ye)外、機(ji)場(chang)、工廠等，一(yi)般采用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)方式。分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)方式的抗干(gan)擾(rao)能(neng)(neng)力不(bu)強，其(qi)抗干(gan)擾(rao)能(neng)(neng)力主(zhu)(zhu)要取(qu)決(jue)于射(she)頻(pin)(pin)(pin)(pin)(pin)功(gong)率的大小。分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技術(shu)(shu)(shu)的功(gong)率一(yi)般是(shi)50dB在(zai)50dB左右時，其(qi)抗干(gan)擾(rao)能(neng)(neng)力強。但(dan)由于分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)的干(gan)擾(rao)與(yu)噪聲(sheng)(主(zhu)(zhu)要是(shi)周邊噪聲(sheng))具有(you)(you)很強的互通性(xing)，當分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)發射(she)的信(xin)(xin)(xin)號(hao)(hao)(hao)超(chao)過50dB時，其(qi)抗千擾(rao)能(neng)(neng)力就會減弱。另(ling)外，在(zai)一(yi)些(xie)有(you)(you)噪音(yin)的環境中(zhong)使用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技術(shu)(shu)(shu)，會使分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)信(xin)(xin)(xin)號(hao)(hao)(hao)無(wu)法到達發射(she)端(duan)的接(jie)收機(ji)或者造(zao)成發射(she)端(duan)信(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接(jie)收端(duan)信(xin)(xin)(xin)號(hao)(hao)(hao)的糟合(he)而(er)造(zao)成分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)或干(gan)擾(rao)(例(li)如(ru)在(zai)使用(yong)(yong)室外電話時) 。而(er)采用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技術(shu)(shu)(shu)的無(wu)線(xian)(xian)對講(jiang)系統由于發射(she)功(gong)率小，分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)后的信(xin)(xin)(xin)號(hao)(hao)(hao)強度比有(you)(you)線(xian)(xian)對講(jiang)系統高(gao)很多(duo)(在(zai)實(shi)際使用(yong)(yong)中(zhong)分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)設備一(yi)般可以將系統信(xin)(xin)(xin)號(hao)(hao)(hao)分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)到50dB以上(shang)),信(xin)(xin)(xin)號(hao)(hao)(hao)不(bu)受干(gan)擾(rao)。如(ru)果采用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技術(shu)(shu)(shu)，需(xu)要在(zai)較大的回波功(gong)率下才能(neng)(neng)實(shi)現信(xin)(xin)(xin)號(hao)(hao)(hao)的分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)工作(如(ru)分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)器發射(she)信(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接(jie)收信(xin)(xin)(xin)號(hao)(hao)(hao)重疊時產(chan)生的千擾(rao))和發送(song)信(xin)(xin)(xin)號(hao)(hao)(hao)強度降低(同(tong)頻(pin)(pin)(pin)(pin)(pin)帶內(nei)的兩只天(tian)線(xian)(xian)對同(tong)一(yi)信(xin)(xin)(xin)道傳輸的信(xin)(xin)(xin)號(hao)(hao)(hao)強度基本一(yi)致);如(ru)果采用(yong)(yong)混響技術(shu)(shu)(shu)，則可以實(shi)現對無(wu)線(xian)(xian)信(xin)(xin)(xin)號(hao)(hao)(hao)干(gan)擾(rao)的抑制或降低。