由于在戶(hu)(hu)外(wai)、室內(nei)等(deng)(deng)(deng)區域，無(wu)(wu)(wu)線(xian)對(dui)講(jiang)(jiang)系統(tong)(tong)(tong)的(de)(de)信號(hao)強度較(jiao)(jiao)弱，而且采用(yong)(yong)(yong)頻率調制技術（如 MHZ、 NMR、 BSI等(deng)(deng)(deng)）產生(sheng)的(de)(de)信號(hao)傳(chuan)輸(shu)時延(yan)大，傳(chuan)輸(shu)距(ju)離遠。因此(ci)有(you)線(xian)對(dui)講(jiang)(jiang)系統(tong)(tong)(tong)不適合在戶(hu)(hu)外(wai)環境(jing)使(shi)(shi)用(yong)(yong)(yong)，特別是在冬天(tian)及低風(feng)速季節使(shi)(shi)用(yong)(yong)(yong)。雖然無(wu)(wu)(wu)線(xian)對(dui)講(jiang)(jiang)系統(tong)(tong)(tong)也有(you)著(zhu)不錯的(de)(de)效(xiao)果。但由于系統(tong)(tong)(tong)工作時會有(you)一定(ding)的(de)(de)干擾，使(shi)(shi)對(dui)講(jiang)(jiang)效(xiao)果下降，另(ling)外(wai)在信號(hao)較(jiao)(jiao)弱時對(dui)用(yong)(yong)(yong)戶(hu)(hu)語音產生(sheng)了影響。特別是在人員復雜(za)、通信距(ju)離較(jiao)(jiao)短(duan)或需要(yao)較(jiao)(jiao)長時間使(shi)(shi)用(yong)(yong)(yong)時。因此(ci)，更需要(yao)有(you)一個可(ke)靠的(de)(de)無(wu)(wu)(wu)線(xian)對(dui)講(jiang)(jiang)系統(tong)(tong)(tong)提(ti)供與有(you)線(xian)對(dui)講(jiang)(jiang)系統(tong)(tong)(tong)一樣的(de)(de)語音信息與控制。無(wu)(wu)(wu)線(xian)對(dui)講(jiang)(jiang)系統(tong)(tong)(tong)具有(you)很高(gao)的(de)(de)靈活性(xing)，它(ta)能夠(gou)滿足現場中所有(you)環境(jing)使(shi)(shi)用(yong)(yong)(yong)需求并能隨時切(qie)換（如在野(ye)外(wai)、戶(hu)(hu)外(wai)電(dian)話等(deng)(deng)(deng)),用(yong)(yong)(yong)戶(hu)(hu)可(ke)以在任何地(di)點(dian)使(shi)(shi)用(yong)(yong)(yong)、隨時、隨地(di)進行通訊。使(shi)(shi)用(yong)(yong)(yong)方便、節省成本、節約(yue)費用(yong)(yong)(yong)。下面(mian)我(wo)們來(lai)了解一下無(wu)(wu)(wu)線(xian)對(dui)講(jiang)(jiang)系統(tong)(tong)(tong)它(ta)主要(yao)是什么優點(dian)？

1.性能穩(wen)定，可靠性高

在相同無(wu)(wu)線(xian)(xian)(xian)傳輸(shu)距離下(xia)，無(wu)(wu)線(xian)(xian)(xian)傳輸(shu)信(xin)(xin)(xin)(xin)號(hao)更穩定由(you)于使用了功(gong)率放大器來對無(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)(xin)(xin)號(hao)進行(xing)壓縮和(he)(he)放大，使無(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)(xin)(xin)號(hao)更加穩定可靠。無(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)(xin)(xin)號(hao)在弱(ruo)電磁環(huan)境下(xia)也能(neng)保(bao)(bao)持(chi)(chi)較(jiao)好的(de)(de)性(xing)(xing)能(neng)。無(wu)(wu)線(xian)(xian)(xian)對講(jiang)系(xi)統(tong)具有發(fa)射(she)功(gong)率小、抗(kang)千(qian)擾(rao)能(neng)力(li)強(與有線(xian)(xian)(xian)對講(jiang)系(xi)統(tong)比較(jiao))和(he)(he)抗(kang)電磁干擾(rao)能(neng)力(li)強(與有線(xian)(xian)(xian)對講(jiang)系(xi)統(tong)比較(jiao))的(de)(de)特點(dian)。無(wu)(wu)線(xian)(xian)(xian)對講(jiang)系(xi)統(tong)發(fa)射(she)信(xin)(xin)(xin)(xin)號(hao)在發(fa)射(she)前和(he)(he)發(fa)射(she)后均能(neng)保(bao)(bao)持(chi)(chi)良好的(de)(de)性(xing)(xing)能(neng)，使用過程(cheng)中(zhong)，發(fa)射(she)信(xin)(xin)(xin)(xin)號(hao)與接收信(xin)(xin)(xin)(xin)號(hao)完全不受任(ren)何千(qian)擾(rao)，可保(bao)(bao)持(chi)(chi)很好的(de)(de)穩定性(xing)(xing)，具有良好的(de)(de)抗(kang)千(qian)擾(rao)性(xing)(xing)和(he)(he)抗(kang)低頻干擾(rao)能(neng)力(li)，即(ji)使在惡劣的(de)(de)環(huan)境下(xia)也能(neng)保(bao)(bao)持(chi)(chi)較(jiao)好的(de)(de)性(xing)(xing)能(neng)。因此無(wu)(wu)線(xian)(xian)(xian)系(xi)統(tong)有較(jiao)高的(de)(de)可靠性(xing)(xing)。

2.功耗小、不受天氣、濕(shi)度的影響(xiang)

無(wu)線對(dui)講系(xi)(xi)統在(zai)不同(tong)的環(huan)境(jing)中(zhong)，無(wu)線通(tong)信設(she)備(bei)(bei)和有(you)線通(tong)信設(she)備(bei)(bei)一(yi)樣都(dou)要進行電(dian)能的消耗(hao)。當(dang)(dang)環(huan)境(jing)溫(wen)度(du)在(zai)-40°C以下時，無(wu)線通(tong)信設(she)備(bei)(bei)需要每天(tian)工作8小(xiao)時左右;當(dang)(dang)環(huan)境(jing)溫(wen)度(du)為-20°C時，每天(tian)工作8小(xiao)時左右;當(dang)(dang)環(huan)境(jing)溫(wen)度(du)為-30°C時，每天(tian)工作4小(xiao)時左右。目前市場上常見的無(wu)線對(dui)講系(xi)(xi)統有(you)兩(liang)種(zhong)電(dian)源(yuan)輸入方(fang)式，一(yi)種(zhong)是電(dian)源(yuan)輸入，另一(yi)種(zhong)是電(dian)源(yuan)輸出。從這兩(liang)種(zhong)方(fang)式對(dui)系(xi)(xi)統的功耗(hao)來看，電(dian)源(yuan)輸入方(fang)式的功耗(hao)更(geng)大(da)一(yi)些，但(dan)是功耗(hao)很小(xiao)。并且設(she)備(bei)(bei)的工作環(huan)境(jing)不同(tong)，對(dui)電(dian)池的需求量也不同(tong)，所以功耗(hao)也不同(tong)。

3信號不受干擾

在(zai)一(yi)(yi)(yi)些有(you)干(gan)(gan)擾(rao)(rao)的(de)(de)(de)地(di)方，例(li)如野外(wai)、機(ji)場、工(gong)廠(chang)等，一(yi)(yi)(yi)般(ban)(ban)采用(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)方式。分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)方式的(de)(de)(de)抗(kang)(kang)干(gan)(gan)擾(rao)(rao)能(neng)(neng)力不強(qiang)(qiang)，其(qi)抗(kang)(kang)干(gan)(gan)擾(rao)(rao)能(neng)(neng)力主(zhu)要取決于射(she)頻(pin)(pin)(pin)(pin)(pin)功(gong)率(lv)的(de)(de)(de)大小。分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)功(gong)率(lv)一(yi)(yi)(yi)般(ban)(ban)是50dB在(zai)50dB左右時(shi)(shi)，其(qi)抗(kang)(kang)干(gan)(gan)擾(rao)(rao)能(neng)(neng)力強(qiang)(qiang)。但由于分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)的(de)(de)(de)干(gan)(gan)擾(rao)(rao)與噪(zao)聲(主(zhu)要是周邊噪(zao)聲)具有(you)很強(qiang)(qiang)的(de)(de)(de)互通性，當分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)發(fa)射(she)的(de)(de)(de)信號(hao)(hao)(hao)(hao)(hao)(hao)超過50dB時(shi)(shi)，其(qi)抗(kang)(kang)千擾(rao)(rao)能(neng)(neng)力就會(hui)減弱。另外(wai)，在(zai)一(yi)(yi)(yi)些有(you)噪(zao)音的(de)(de)(de)環境中使(shi)(shi)用(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)，會(hui)使(shi)(shi)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)信號(hao)(hao)(hao)(hao)(hao)(hao)無(wu)法(fa)到達發(fa)射(she)端的(de)(de)(de)接(jie)收(shou)機(ji)或者造成發(fa)射(she)端信號(hao)(hao)(hao)(hao)(hao)(hao)與接(jie)收(shou)端信號(hao)(hao)(hao)(hao)(hao)(hao)的(de)(de)(de)糟合(he)而造成分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)或干(gan)(gan)擾(rao)(rao)(例(li)如在(zai)使(shi)(shi)用(yong)室外(wai)電(dian)話時(shi)(shi)) 。而采用(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)無(wu)線對(dui)講(jiang)系統由于發(fa)射(she)功(gong)率(lv)小，分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)后的(de)(de)(de)信號(hao)(hao)(hao)(hao)(hao)(hao)強(qiang)(qiang)度(du)(du)比(bi)有(you)線對(dui)講(jiang)系統高很多(在(zai)實際使(shi)(shi)用(yong)中分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)設備一(yi)(yi)(yi)般(ban)(ban)可以將系統信號(hao)(hao)(hao)(hao)(hao)(hao)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)到50dB以上),信號(hao)(hao)(hao)(hao)(hao)(hao)不受干(gan)(gan)擾(rao)(rao)。如果采用(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)，需要在(zai)較大的(de)(de)(de)回波功(gong)率(lv)下才能(neng)(neng)實現信號(hao)(hao)(hao)(hao)(hao)(hao)的(de)(de)(de)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)工(gong)作(zuo)(如分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)器發(fa)射(she)信號(hao)(hao)(hao)(hao)(hao)(hao)與接(jie)收(shou)信號(hao)(hao)(hao)(hao)(hao)(hao)重疊時(shi)(shi)產生(sheng)的(de)(de)(de)千擾(rao)(rao))和(he)發(fa)送信號(hao)(hao)(hao)(hao)(hao)(hao)強(qiang)(qiang)度(du)(du)降(jiang)(jiang)低(di)(同頻(pin)(pin)(pin)(pin)(pin)帶內的(de)(de)(de)兩只(zhi)天線對(dui)同一(yi)(yi)(yi)信道(dao)傳輸的(de)(de)(de)信號(hao)(hao)(hao)(hao)(hao)(hao)強(qiang)(qiang)度(du)(du)基本一(yi)(yi)(yi)致);如果采用(yong)混響技(ji)術(shu)，則(ze)可以實現對(dui)無(wu)線信號(hao)(hao)(hao)(hao)(hao)(hao)干(gan)(gan)擾(rao)(rao)的(de)(de)(de)抑制或降(jiang)(jiang)低(di)。