由于(yu)在戶(hu)外、室內等(deng)區域，無線(xian)(xian)(xian)(xian)對(dui)講(jiang)系(xi)(xi)(xi)(xi)統(tong)的(de)(de)(de)信(xin)(xin)號強(qiang)度較(jiao)(jiao)弱，而且采用(yong)頻率調制(zhi)技術(shu)（如(ru) MHZ、 NMR、 BSI等(deng)）產生(sheng)的(de)(de)(de)信(xin)(xin)號傳(chuan)輸時(shi)(shi)延大，傳(chuan)輸距離遠。因此有(you)線(xian)(xian)(xian)(xian)對(dui)講(jiang)系(xi)(xi)(xi)(xi)統(tong)不(bu)適合(he)在戶(hu)外環境(jing)使(shi)用(yong)，特(te)別是在冬天及低風速季節使(shi)用(yong)。雖然無線(xian)(xian)(xian)(xian)對(dui)講(jiang)系(xi)(xi)(xi)(xi)統(tong)也有(you)著不(bu)錯(cuo)的(de)(de)(de)效(xiao)果。但由于(yu)系(xi)(xi)(xi)(xi)統(tong)工(gong)作時(shi)(shi)會(hui)有(you)一(yi)定的(de)(de)(de)干擾(rao)，使(shi)對(dui)講(jiang)效(xiao)果下降，另外在信(xin)(xin)號較(jiao)(jiao)弱時(shi)(shi)對(dui)用(yong)戶(hu)語音(yin)(yin)產生(sheng)了影響。特(te)別是在人員復(fu)雜(za)、通信(xin)(xin)距離較(jiao)(jiao)短(duan)或(huo)需要(yao)較(jiao)(jiao)長時(shi)(shi)間使(shi)用(yong)時(shi)(shi)。因此，更需要(yao)有(you)一(yi)個可靠的(de)(de)(de)無線(xian)(xian)(xian)(xian)對(dui)講(jiang)系(xi)(xi)(xi)(xi)統(tong)提供與有(you)線(xian)(xian)(xian)(xian)對(dui)講(jiang)系(xi)(xi)(xi)(xi)統(tong)一(yi)樣的(de)(de)(de)語音(yin)(yin)信(xin)(xin)息(xi)與控制(zhi)。無線(xian)(xian)(xian)(xian)對(dui)講(jiang)系(xi)(xi)(xi)(xi)統(tong)具(ju)有(you)很高的(de)(de)(de)靈活(huo)性，它(ta)(ta)能夠滿足(zu)現場中所有(you)環境(jing)使(shi)用(yong)需求并能隨時(shi)(shi)切換（如(ru)在野外、戶(hu)外電話(hua)等(deng)),用(yong)戶(hu)可以在任(ren)何地點(dian)使(shi)用(yong)、隨時(shi)(shi)、隨地進行(xing)通訊。使(shi)用(yong)方(fang)便、節省成本、節約費用(yong)。下面(mian)我們來(lai)了解一(yi)下無線(xian)(xian)(xian)(xian)對(dui)講(jiang)系(xi)(xi)(xi)(xi)統(tong)它(ta)(ta)主要(yao)是什么優點(dian)？

1.性(xing)能穩定，可靠性(xing)高(gao)

在相同無(wu)(wu)線(xian)(xian)(xian)傳輸距離(li)下，無(wu)(wu)線(xian)(xian)(xian)傳輸信(xin)號更穩定由于使(shi)(shi)用了功(gong)率放大器來對(dui)(dui)無(wu)(wu)線(xian)(xian)(xian)信(xin)號進行壓縮和(he)(he)放大，使(shi)(shi)無(wu)(wu)線(xian)(xian)(xian)信(xin)號更加穩定可(ke)靠。無(wu)(wu)線(xian)(xian)(xian)信(xin)號在弱電磁環境(jing)(jing)下也能(neng)(neng)(neng)保持(chi)較好(hao)的(de)性能(neng)(neng)(neng)。無(wu)(wu)線(xian)(xian)(xian)對(dui)(dui)講系統具有(you)(you)(you)發(fa)(fa)射(she)(she)(she)功(gong)率小(xiao)、抗千擾能(neng)(neng)(neng)力(li)強(qiang)(與有(you)(you)(you)線(xian)(xian)(xian)對(dui)(dui)講系統比較)和(he)(he)抗電磁干擾能(neng)(neng)(neng)力(li)強(qiang)(與有(you)(you)(you)線(xian)(xian)(xian)對(dui)(dui)講系統比較)的(de)特點。無(wu)(wu)線(xian)(xian)(xian)對(dui)(dui)講系統發(fa)(fa)射(she)(she)(she)信(xin)號在發(fa)(fa)射(she)(she)(she)前(qian)和(he)(he)發(fa)(fa)射(she)(she)(she)后均能(neng)(neng)(neng)保持(chi)良好(hao)的(de)性能(neng)(neng)(neng)，使(shi)(shi)用過程中，發(fa)(fa)射(she)(she)(she)信(xin)號與接收信(xin)號完全(quan)不(bu)受任何千擾，可(ke)保持(chi)很好(hao)的(de)穩定性，具有(you)(you)(you)良好(hao)的(de)抗千擾性和(he)(he)抗低頻干擾能(neng)(neng)(neng)力(li)，即使(shi)(shi)在惡(e)劣的(de)環境(jing)(jing)下也能(neng)(neng)(neng)保持(chi)較好(hao)的(de)性能(neng)(neng)(neng)。因此無(wu)(wu)線(xian)(xian)(xian)系統有(you)(you)(you)較高的(de)可(ke)靠性。

2.功(gong)耗小、不受(shou)天(tian)氣、濕度的(de)影(ying)響

無(wu)(wu)線(xian)對(dui)講系(xi)(xi)統(tong)在不(bu)同(tong)的(de)(de)環(huan)(huan)(huan)(huan)境中，無(wu)(wu)線(xian)通(tong)(tong)信(xin)設(she)備(bei)和有線(xian)通(tong)(tong)信(xin)設(she)備(bei)一(yi)樣都要(yao)進(jin)行電(dian)能(neng)的(de)(de)消耗(hao)。當環(huan)(huan)(huan)(huan)境溫(wen)度(du)(du)在-40°C以(yi)下時(shi)，無(wu)(wu)線(xian)通(tong)(tong)信(xin)設(she)備(bei)需要(yao)每(mei)天工(gong)作(zuo)8小(xiao)時(shi)左(zuo)右;當環(huan)(huan)(huan)(huan)境溫(wen)度(du)(du)為-20°C時(shi)，每(mei)天工(gong)作(zuo)8小(xiao)時(shi)左(zuo)右;當環(huan)(huan)(huan)(huan)境溫(wen)度(du)(du)為-30°C時(shi)，每(mei)天工(gong)作(zuo)4小(xiao)時(shi)左(zuo)右。目前市場上常(chang)見的(de)(de)無(wu)(wu)線(xian)對(dui)講系(xi)(xi)統(tong)有兩種(zhong)(zhong)(zhong)電(dian)源輸入(ru)方(fang)式，一(yi)種(zhong)(zhong)(zhong)是(shi)電(dian)源輸入(ru)，另一(yi)種(zhong)(zhong)(zhong)是(shi)電(dian)源輸出(chu)。從這兩種(zhong)(zhong)(zhong)方(fang)式對(dui)系(xi)(xi)統(tong)的(de)(de)功(gong)(gong)耗(hao)來看，電(dian)源輸入(ru)方(fang)式的(de)(de)功(gong)(gong)耗(hao)更(geng)大一(yi)些，但是(shi)功(gong)(gong)耗(hao)很小(xiao)。并且(qie)設(she)備(bei)的(de)(de)工(gong)作(zuo)環(huan)(huan)(huan)(huan)境不(bu)同(tong)，對(dui)電(dian)池的(de)(de)需求量也(ye)不(bu)同(tong)，所以(yi)功(gong)(gong)耗(hao)也(ye)不(bu)同(tong)。

3信號不受干擾

在一(yi)些有干(gan)(gan)擾(rao)(rao)的(de)地方，例如(ru)野外、機場、工(gong)廠等，一(yi)般(ban)采(cai)用(yong)分(fen)頻方式。分(fen)頻方式的(de)抗(kang)干(gan)(gan)擾(rao)(rao)能(neng)力不強(qiang)(qiang)，其(qi)抗(kang)干(gan)(gan)擾(rao)(rao)能(neng)力主(zhu)要(yao)取決于射(she)頻功率的(de)大小。分(fen)頻技術的(de)功率一(yi)般(ban)是50dB在50dB左右時，其(qi)抗(kang)干(gan)(gan)擾(rao)(rao)能(neng)力強(qiang)(qiang)。但由(you)于分(fen)頻的(de)干(gan)(gan)擾(rao)(rao)與噪(zao)(zao)聲(主(zhu)要(yao)是周邊噪(zao)(zao)聲)具有很強(qiang)(qiang)的(de)互通性，當分(fen)頻發(fa)(fa)射(she)的(de)信(xin)(xin)(xin)號(hao)(hao)(hao)超過50dB時，其(qi)抗(kang)千擾(rao)(rao)能(neng)力就會減弱(ruo)。另外，在一(yi)些有噪(zao)(zao)音的(de)環境中(zhong)使用(yong)分(fen)頻技術，會使分(fen)頻信(xin)(xin)(xin)號(hao)(hao)(hao)無(wu)法(fa)到(dao)達發(fa)(fa)射(she)端(duan)的(de)接(jie)收機或(huo)者造(zao)成發(fa)(fa)射(she)端(duan)信(xin)(xin)(xin)號(hao)(hao)(hao)與接(jie)收端(duan)信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)糟合(he)而(er)造(zao)成分(fen)頻或(huo)干(gan)(gan)擾(rao)(rao)(例如(ru)在使用(yong)室外電話時) 。而(er)采(cai)用(yong)分(fen)頻技術的(de)無(wu)線(xian)(xian)對講(jiang)系(xi)統由(you)于發(fa)(fa)射(she)功率小，分(fen)頻后(hou)的(de)信(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)度比有線(xian)(xian)對講(jiang)系(xi)統高很多(在實(shi)際(ji)使用(yong)中(zhong)分(fen)頻設備(bei)一(yi)般(ban)可(ke)以(yi)將系(xi)統信(xin)(xin)(xin)號(hao)(hao)(hao)分(fen)頻到(dao)50dB以(yi)上),信(xin)(xin)(xin)號(hao)(hao)(hao)不受干(gan)(gan)擾(rao)(rao)。如(ru)果(guo)采(cai)用(yong)分(fen)頻技術，需要(yao)在較(jiao)大的(de)回(hui)波功率下才能(neng)實(shi)現信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)分(fen)頻工(gong)作(如(ru)分(fen)頻器發(fa)(fa)射(she)信(xin)(xin)(xin)號(hao)(hao)(hao)與接(jie)收信(xin)(xin)(xin)號(hao)(hao)(hao)重(zhong)疊時產生的(de)千擾(rao)(rao))和(he)發(fa)(fa)送(song)信(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)度降低(同(tong)頻帶內的(de)兩(liang)只(zhi)天線(xian)(xian)對同(tong)一(yi)信(xin)(xin)(xin)道傳輸的(de)信(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)度基本(ben)一(yi)致);如(ru)果(guo)采(cai)用(yong)混(hun)響技術，則可(ke)以(yi)實(shi)現對無(wu)線(xian)(xian)信(xin)(xin)(xin)號(hao)(hao)(hao)干(gan)(gan)擾(rao)(rao)的(de)抑制或(huo)降低。