由于在(zai)(zai)(zai)戶(hu)(hu)外(wai)(wai)(wai)、室內等區域，無(wu)(wu)線對(dui)講(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)的(de)信(xin)號強度(du)較弱，而且采用(yong)(yong)頻(pin)率調制技術（如 MHZ、 NMR、 BSI等）產生(sheng)的(de)信(xin)號傳(chuan)輸(shu)時(shi)延大，傳(chuan)輸(shu)距(ju)離遠。因此(ci)有(you)線對(dui)講(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)不(bu)適合在(zai)(zai)(zai)戶(hu)(hu)外(wai)(wai)(wai)環境(jing)使(shi)(shi)用(yong)(yong)，特別(bie)是在(zai)(zai)(zai)冬天及低風(feng)速季節使(shi)(shi)用(yong)(yong)。雖然無(wu)(wu)線對(dui)講(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)也有(you)著不(bu)錯的(de)效果。但(dan)由于系(xi)(xi)(xi)統(tong)(tong)(tong)工作(zuo)時(shi)會有(you)一(yi)定的(de)干擾，使(shi)(shi)對(dui)講(jiang)效果下降，另外(wai)(wai)(wai)在(zai)(zai)(zai)信(xin)號較弱時(shi)對(dui)用(yong)(yong)戶(hu)(hu)語(yu)音產生(sheng)了影響。特別(bie)是在(zai)(zai)(zai)人(ren)員復雜、通信(xin)距(ju)離較短或需要(yao)較長時(shi)間使(shi)(shi)用(yong)(yong)時(shi)。因此(ci)，更需要(yao)有(you)一(yi)個可靠的(de)無(wu)(wu)線對(dui)講(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)提供與有(you)線對(dui)講(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)一(yi)樣(yang)的(de)語(yu)音信(xin)息與控制。無(wu)(wu)線對(dui)講(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)具(ju)有(you)很高的(de)靈活性，它能(neng)夠滿足現場中所有(you)環境(jing)使(shi)(shi)用(yong)(yong)需求并能(neng)隨時(shi)切換（如在(zai)(zai)(zai)野外(wai)(wai)(wai)、戶(hu)(hu)外(wai)(wai)(wai)電(dian)話等),用(yong)(yong)戶(hu)(hu)可以在(zai)(zai)(zai)任何地(di)點使(shi)(shi)用(yong)(yong)、隨時(shi)、隨地(di)進行通訊。使(shi)(shi)用(yong)(yong)方便、節省成(cheng)本(ben)、節約費用(yong)(yong)。下面我們來了解(jie)一(yi)下無(wu)(wu)線對(dui)講(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)它主要(yao)是什么優點？

1.性能穩定，可靠性高(gao)

在(zai)(zai)相同(tong)無(wu)線(xian)(xian)傳(chuan)輸(shu)(shu)距(ju)離下，無(wu)線(xian)(xian)傳(chuan)輸(shu)(shu)信(xin)號(hao)更穩(wen)定(ding)由于使(shi)用了功率放(fang)大器來對(dui)(dui)(dui)無(wu)線(xian)(xian)信(xin)號(hao)進行壓縮和(he)(he)放(fang)大，使(shi)無(wu)線(xian)(xian)信(xin)號(hao)更加穩(wen)定(ding)可(ke)靠。無(wu)線(xian)(xian)信(xin)號(hao)在(zai)(zai)弱(ruo)電磁環(huan)境(jing)下也能(neng)(neng)(neng)保持較好(hao)的(de)性(xing)能(neng)(neng)(neng)。無(wu)線(xian)(xian)對(dui)(dui)(dui)講(jiang)系(xi)統(tong)(tong)(tong)具有(you)發射(she)功率小、抗千擾(rao)(rao)(rao)能(neng)(neng)(neng)力(li)強(與有(you)線(xian)(xian)對(dui)(dui)(dui)講(jiang)系(xi)統(tong)(tong)(tong)比較)和(he)(he)抗電磁干擾(rao)(rao)(rao)能(neng)(neng)(neng)力(li)強(與有(you)線(xian)(xian)對(dui)(dui)(dui)講(jiang)系(xi)統(tong)(tong)(tong)比較)的(de)特點(dian)。無(wu)線(xian)(xian)對(dui)(dui)(dui)講(jiang)系(xi)統(tong)(tong)(tong)發射(she)信(xin)號(hao)在(zai)(zai)發射(she)前(qian)和(he)(he)發射(she)后均能(neng)(neng)(neng)保持良好(hao)的(de)性(xing)能(neng)(neng)(neng)，使(shi)用過程中，發射(she)信(xin)號(hao)與接(jie)收信(xin)號(hao)完(wan)全(quan)不受任何千擾(rao)(rao)(rao)，可(ke)保持很(hen)好(hao)的(de)穩(wen)定(ding)性(xing)，具有(you)良好(hao)的(de)抗千擾(rao)(rao)(rao)性(xing)和(he)(he)抗低頻(pin)干擾(rao)(rao)(rao)能(neng)(neng)(neng)力(li)，即使(shi)在(zai)(zai)惡劣的(de)環(huan)境(jing)下也能(neng)(neng)(neng)保持較好(hao)的(de)性(xing)能(neng)(neng)(neng)。因(yin)此無(wu)線(xian)(xian)系(xi)統(tong)(tong)(tong)有(you)較高的(de)可(ke)靠性(xing)。

2.功耗小、不受天(tian)氣、濕度的影響(xiang)

無線(xian)對講系統在不(bu)同(tong)的環(huan)境(jing)(jing)中，無線(xian)通信設(she)備和有(you)線(xian)通信設(she)備一(yi)樣(yang)都要進行電(dian)能的消耗(hao)。當(dang)(dang)環(huan)境(jing)(jing)溫度在-40°C以下時(shi)，無線(xian)通信設(she)備需要每天(tian)工(gong)作(zuo)8小(xiao)時(shi)左右;當(dang)(dang)環(huan)境(jing)(jing)溫度為-20°C時(shi)，每天(tian)工(gong)作(zuo)8小(xiao)時(shi)左右;當(dang)(dang)環(huan)境(jing)(jing)溫度為-30°C時(shi)，每天(tian)工(gong)作(zuo)4小(xiao)時(shi)左右。目(mu)前市場上常(chang)見的無線(xian)對講系統有(you)兩(liang)種電(dian)源(yuan)輸(shu)(shu)入方(fang)式，一(yi)種是電(dian)源(yuan)輸(shu)(shu)入，另一(yi)種是電(dian)源(yuan)輸(shu)(shu)出。從(cong)這兩(liang)種方(fang)式對系統的功(gong)耗(hao)來(lai)看，電(dian)源(yuan)輸(shu)(shu)入方(fang)式的功(gong)耗(hao)更大一(yi)些，但是功(gong)耗(hao)很小(xiao)。并且設(she)備的工(gong)作(zuo)環(huan)境(jing)(jing)不(bu)同(tong)，對電(dian)池的需求量也不(bu)同(tong)，所以功(gong)耗(hao)也不(bu)同(tong)。

3信號不受干擾

在(zai)(zai)一些有干(gan)(gan)(gan)擾(rao)(rao)的(de)(de)(de)(de)(de)地方(fang)，例(li)如(ru)(ru)野外、機(ji)場(chang)、工廠(chang)等(deng)，一般(ban)采(cai)用(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)方(fang)式。分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)方(fang)式的(de)(de)(de)(de)(de)抗干(gan)(gan)(gan)擾(rao)(rao)能(neng)力(li)不強(qiang)，其抗干(gan)(gan)(gan)擾(rao)(rao)能(neng)力(li)主(zhu)要取決于射(she)(she)(she)頻(pin)(pin)功率(lv)的(de)(de)(de)(de)(de)大(da)小。分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)技(ji)(ji)術(shu)的(de)(de)(de)(de)(de)功率(lv)一般(ban)是50dB在(zai)(zai)50dB左(zuo)右時(shi)(shi)，其抗干(gan)(gan)(gan)擾(rao)(rao)能(neng)力(li)強(qiang)。但由于分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)的(de)(de)(de)(de)(de)干(gan)(gan)(gan)擾(rao)(rao)與噪聲(主(zhu)要是周邊噪聲)具有很(hen)強(qiang)的(de)(de)(de)(de)(de)互(hu)通性，當分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)發(fa)(fa)射(she)(she)(she)的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)超過50dB時(shi)(shi)，其抗千擾(rao)(rao)能(neng)力(li)就會減弱。另(ling)外，在(zai)(zai)一些有噪音的(de)(de)(de)(de)(de)環境中(zhong)(zhong)使用(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)技(ji)(ji)術(shu)，會使分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)無法到(dao)達發(fa)(fa)射(she)(she)(she)端的(de)(de)(de)(de)(de)接收(shou)機(ji)或(huo)者造(zao)(zao)成發(fa)(fa)射(she)(she)(she)端信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)與接收(shou)端信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)(de)糟合而造(zao)(zao)成分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)或(huo)干(gan)(gan)(gan)擾(rao)(rao)(例(li)如(ru)(ru)在(zai)(zai)使用(yong)室外電話時(shi)(shi)) 。而采(cai)用(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)技(ji)(ji)術(shu)的(de)(de)(de)(de)(de)無線對講(jiang)系統(tong)(tong)由于發(fa)(fa)射(she)(she)(she)功率(lv)小，分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)后(hou)的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)度(du)比有線對講(jiang)系統(tong)(tong)高很(hen)多(在(zai)(zai)實際(ji)使用(yong)中(zhong)(zhong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)設(she)備一般(ban)可(ke)以將系統(tong)(tong)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)到(dao)50dB以上),信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)不受干(gan)(gan)(gan)擾(rao)(rao)。如(ru)(ru)果(guo)采(cai)用(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)技(ji)(ji)術(shu)，需要在(zai)(zai)較(jiao)大(da)的(de)(de)(de)(de)(de)回(hui)波功率(lv)下才能(neng)實現信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)(de)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)工作(如(ru)(ru)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)器(qi)發(fa)(fa)射(she)(she)(she)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)與接收(shou)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)重(zhong)疊時(shi)(shi)產生(sheng)的(de)(de)(de)(de)(de)千擾(rao)(rao))和(he)發(fa)(fa)送信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)度(du)降低(同(tong)頻(pin)(pin)帶內的(de)(de)(de)(de)(de)兩(liang)只(zhi)天線對同(tong)一信(xin)(xin)(xin)(xin)道傳輸的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)度(du)基本一致);如(ru)(ru)果(guo)采(cai)用(yong)混(hun)響技(ji)(ji)術(shu)，則可(ke)以實現對無線信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)干(gan)(gan)(gan)擾(rao)(rao)的(de)(de)(de)(de)(de)抑(yi)制(zhi)或(huo)降低。