由(you)于(yu)在(zai)(zai)(zai)戶(hu)外(wai)、室內等區域，無(wu)(wu)線(xian)對講系(xi)(xi)統(tong)的(de)信號強度較(jiao)弱(ruo)，而且采用(yong)頻率調(diao)制技術（如 MHZ、 NMR、 BSI等）產(chan)(chan)生(sheng)的(de)信號傳輸時(shi)(shi)延大，傳輸距(ju)離(li)遠。因(yin)此有(you)線(xian)對講系(xi)(xi)統(tong)不適合(he)在(zai)(zai)(zai)戶(hu)外(wai)環境使(shi)(shi)用(yong)，特(te)別是在(zai)(zai)(zai)冬天及低風速季節(jie)使(shi)(shi)用(yong)。雖(sui)然(ran)無(wu)(wu)線(xian)對講系(xi)(xi)統(tong)也有(you)著不錯(cuo)的(de)效(xiao)(xiao)果。但由(you)于(yu)系(xi)(xi)統(tong)工(gong)作時(shi)(shi)會有(you)一(yi)定的(de)干擾，使(shi)(shi)對講效(xiao)(xiao)果下降(jiang)，另外(wai)在(zai)(zai)(zai)信號較(jiao)弱(ruo)時(shi)(shi)對用(yong)戶(hu)語音產(chan)(chan)生(sheng)了影響。特(te)別是在(zai)(zai)(zai)人員復雜(za)、通信距(ju)離(li)較(jiao)短或需(xu)要(yao)較(jiao)長時(shi)(shi)間使(shi)(shi)用(yong)時(shi)(shi)。因(yin)此，更需(xu)要(yao)有(you)一(yi)個可靠的(de)無(wu)(wu)線(xian)對講系(xi)(xi)統(tong)提供與(yu)有(you)線(xian)對講系(xi)(xi)統(tong)一(yi)樣(yang)的(de)語音信息與(yu)控制。無(wu)(wu)線(xian)對講系(xi)(xi)統(tong)具有(you)很(hen)高的(de)靈活性，它(ta)能(neng)夠滿足現場中所有(you)環境使(shi)(shi)用(yong)需(xu)求并能(neng)隨時(shi)(shi)切換(huan)（如在(zai)(zai)(zai)野外(wai)、戶(hu)外(wai)電話等),用(yong)戶(hu)可以在(zai)(zai)(zai)任何地點使(shi)(shi)用(yong)、隨時(shi)(shi)、隨地進(jin)行通訊。使(shi)(shi)用(yong)方(fang)便、節(jie)省成本、節(jie)約費(fei)用(yong)。下面我(wo)們來了解一(yi)下無(wu)(wu)線(xian)對講系(xi)(xi)統(tong)它(ta)主要(yao)是什么優點？

1.性(xing)能穩定，可靠性(xing)高

在相同無(wu)線(xian)(xian)(xian)傳(chuan)輸(shu)距離下，無(wu)線(xian)(xian)(xian)傳(chuan)輸(shu)信號(hao)(hao)(hao)(hao)更穩(wen)(wen)定(ding)由于(yu)使用了功率(lv)放大器(qi)來對(dui)(dui)無(wu)線(xian)(xian)(xian)信號(hao)(hao)(hao)(hao)進行壓縮和(he)放大，使無(wu)線(xian)(xian)(xian)信號(hao)(hao)(hao)(hao)更加(jia)穩(wen)(wen)定(ding)可靠。無(wu)線(xian)(xian)(xian)信號(hao)(hao)(hao)(hao)在弱電磁環境(jing)下也能(neng)(neng)保持(chi)較(jiao)好(hao)(hao)的(de)性(xing)(xing)能(neng)(neng)。無(wu)線(xian)(xian)(xian)對(dui)(dui)講系(xi)統(tong)具有(you)發(fa)射功率(lv)小、抗(kang)千擾能(neng)(neng)力強(與(yu)有(you)線(xian)(xian)(xian)對(dui)(dui)講系(xi)統(tong)比(bi)較(jiao))和(he)抗(kang)電磁干擾能(neng)(neng)力強(與(yu)有(you)線(xian)(xian)(xian)對(dui)(dui)講系(xi)統(tong)比(bi)較(jiao))的(de)特點。無(wu)線(xian)(xian)(xian)對(dui)(dui)講系(xi)統(tong)發(fa)射信號(hao)(hao)(hao)(hao)在發(fa)射前和(he)發(fa)射后均(jun)能(neng)(neng)保持(chi)良好(hao)(hao)的(de)性(xing)(xing)能(neng)(neng)，使用過程中，發(fa)射信號(hao)(hao)(hao)(hao)與(yu)接收信號(hao)(hao)(hao)(hao)完全不(bu)受(shou)任何千擾，可保持(chi)很好(hao)(hao)的(de)穩(wen)(wen)定(ding)性(xing)(xing)，具有(you)良好(hao)(hao)的(de)抗(kang)千擾性(xing)(xing)和(he)抗(kang)低頻干擾能(neng)(neng)力，即使在惡劣的(de)環境(jing)下也能(neng)(neng)保持(chi)較(jiao)好(hao)(hao)的(de)性(xing)(xing)能(neng)(neng)。因此無(wu)線(xian)(xian)(xian)系(xi)統(tong)有(you)較(jiao)高的(de)可靠性(xing)(xing)。

2.功(gong)耗(hao)小、不(bu)受天氣、濕度(du)的影響

無(wu)線對講(jiang)系統在不(bu)(bu)同(tong)的(de)(de)(de)環(huan)境(jing)中(zhong)，無(wu)線通信(xin)設(she)備(bei)和有線通信(xin)設(she)備(bei)一(yi)(yi)樣都要進行電(dian)(dian)能的(de)(de)(de)消耗(hao)。當環(huan)境(jing)溫度(du)在-40°C以下時(shi)(shi)(shi)，無(wu)線通信(xin)設(she)備(bei)需(xu)要每天(tian)工(gong)作(zuo)8小(xiao)時(shi)(shi)(shi)左(zuo)右;當環(huan)境(jing)溫度(du)為-20°C時(shi)(shi)(shi)，每天(tian)工(gong)作(zuo)8小(xiao)時(shi)(shi)(shi)左(zuo)右;當環(huan)境(jing)溫度(du)為-30°C時(shi)(shi)(shi)，每天(tian)工(gong)作(zuo)4小(xiao)時(shi)(shi)(shi)左(zuo)右。目前(qian)市場上常見的(de)(de)(de)無(wu)線對講(jiang)系統有兩種(zhong)(zhong)電(dian)(dian)源(yuan)(yuan)輸入(ru)方(fang)式(shi)(shi)，一(yi)(yi)種(zhong)(zhong)是電(dian)(dian)源(yuan)(yuan)輸入(ru)，另(ling)一(yi)(yi)種(zhong)(zhong)是電(dian)(dian)源(yuan)(yuan)輸出。從(cong)這兩種(zhong)(zhong)方(fang)式(shi)(shi)對系統的(de)(de)(de)功(gong)耗(hao)來看，電(dian)(dian)源(yuan)(yuan)輸入(ru)方(fang)式(shi)(shi)的(de)(de)(de)功(gong)耗(hao)更(geng)大一(yi)(yi)些，但是功(gong)耗(hao)很小(xiao)。并且(qie)設(she)備(bei)的(de)(de)(de)工(gong)作(zuo)環(huan)境(jing)不(bu)(bu)同(tong)，對電(dian)(dian)池(chi)的(de)(de)(de)需(xu)求(qiu)量也(ye)不(bu)(bu)同(tong)，所以功(gong)耗(hao)也(ye)不(bu)(bu)同(tong)。

3信號不受干擾

在一(yi)些有(you)干(gan)(gan)擾(rao)(rao)(rao)(rao)的(de)地方，例如(ru)(ru)野外、機(ji)場、工(gong)廠等，一(yi)般(ban)采(cai)用(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)方式。分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)方式的(de)抗(kang)干(gan)(gan)擾(rao)(rao)(rao)(rao)能(neng)力不強(qiang)(qiang)，其(qi)抗(kang)干(gan)(gan)擾(rao)(rao)(rao)(rao)能(neng)力主要(yao)(yao)取(qu)決于射(she)頻(pin)(pin)(pin)(pin)功(gong)(gong)(gong)率(lv)(lv)的(de)大(da)(da)小。分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)(ji)術(shu)的(de)功(gong)(gong)(gong)率(lv)(lv)一(yi)般(ban)是50dB在50dB左(zuo)右時，其(qi)抗(kang)干(gan)(gan)擾(rao)(rao)(rao)(rao)能(neng)力強(qiang)(qiang)。但由于分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)的(de)干(gan)(gan)擾(rao)(rao)(rao)(rao)與(yu)噪(zao)聲(主要(yao)(yao)是周(zhou)邊噪(zao)聲)具有(you)很強(qiang)(qiang)的(de)互(hu)通性，當分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)發(fa)(fa)射(she)的(de)信號(hao)(hao)(hao)超過50dB時，其(qi)抗(kang)千擾(rao)(rao)(rao)(rao)能(neng)力就(jiu)會(hui)減弱。另外，在一(yi)些有(you)噪(zao)音的(de)環境中(zhong)使(shi)用(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)(ji)術(shu)，會(hui)使(shi)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)信號(hao)(hao)(hao)無(wu)法到達發(fa)(fa)射(she)端的(de)接(jie)(jie)收(shou)機(ji)或者造成發(fa)(fa)射(she)端信號(hao)(hao)(hao)與(yu)接(jie)(jie)收(shou)端信號(hao)(hao)(hao)的(de)糟合而(er)造成分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)或干(gan)(gan)擾(rao)(rao)(rao)(rao)(例如(ru)(ru)在使(shi)用(yong)室外電話時) 。而(er)采(cai)用(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)(ji)術(shu)的(de)無(wu)線(xian)對(dui)(dui)講(jiang)系統(tong)由于發(fa)(fa)射(she)功(gong)(gong)(gong)率(lv)(lv)小，分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)后的(de)信號(hao)(hao)(hao)強(qiang)(qiang)度比有(you)線(xian)對(dui)(dui)講(jiang)系統(tong)高很多(在實際使(shi)用(yong)中(zhong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)設備一(yi)般(ban)可以將系統(tong)信號(hao)(hao)(hao)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)到50dB以上(shang)),信號(hao)(hao)(hao)不受(shou)干(gan)(gan)擾(rao)(rao)(rao)(rao)。如(ru)(ru)果采(cai)用(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)(ji)術(shu)，需要(yao)(yao)在較大(da)(da)的(de)回波功(gong)(gong)(gong)率(lv)(lv)下才能(neng)實現信號(hao)(hao)(hao)的(de)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)工(gong)作(如(ru)(ru)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)器發(fa)(fa)射(she)信號(hao)(hao)(hao)與(yu)接(jie)(jie)收(shou)信號(hao)(hao)(hao)重(zhong)疊時產生(sheng)的(de)千擾(rao)(rao)(rao)(rao))和發(fa)(fa)送信號(hao)(hao)(hao)強(qiang)(qiang)度降低(di)(同頻(pin)(pin)(pin)(pin)帶內的(de)兩只天線(xian)對(dui)(dui)同一(yi)信道傳(chuan)輸的(de)信號(hao)(hao)(hao)強(qiang)(qiang)度基本一(yi)致);如(ru)(ru)果采(cai)用(yong)混(hun)響技(ji)(ji)術(shu)，則可以實現對(dui)(dui)無(wu)線(xian)信號(hao)(hao)(hao)干(gan)(gan)擾(rao)(rao)(rao)(rao)的(de)抑制或降低(di)。