由(you)于在戶外(wai)、室內等區域，無(wu)(wu)(wu)線(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統的(de)(de)信(xin)(xin)號強度(du)較(jiao)弱，而且采用(yong)(yong)頻率調制技術（如 MHZ、 NMR、 BSI等）產(chan)生(sheng)的(de)(de)信(xin)(xin)號傳(chuan)輸(shu)時(shi)(shi)延大，傳(chuan)輸(shu)距離(li)遠。因此有線(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統不(bu)適合在戶外(wai)環(huan)境使(shi)(shi)(shi)用(yong)(yong)，特別是(shi)在冬天及低風速季(ji)節(jie)使(shi)(shi)(shi)用(yong)(yong)。雖然無(wu)(wu)(wu)線(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統也(ye)有著不(bu)錯(cuo)的(de)(de)效(xiao)果。但(dan)由(you)于系(xi)統工作時(shi)(shi)會有一定的(de)(de)干擾(rao)，使(shi)(shi)(shi)對(dui)(dui)講(jiang)(jiang)效(xiao)果下(xia)降，另外(wai)在信(xin)(xin)號較(jiao)弱時(shi)(shi)對(dui)(dui)用(yong)(yong)戶語(yu)音產(chan)生(sheng)了影響。特別是(shi)在人(ren)員復雜(za)、通(tong)信(xin)(xin)距離(li)較(jiao)短或需要較(jiao)長(chang)時(shi)(shi)間(jian)使(shi)(shi)(shi)用(yong)(yong)時(shi)(shi)。因此，更需要有一個可靠的(de)(de)無(wu)(wu)(wu)線(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統提供與有線(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統一樣的(de)(de)語(yu)音信(xin)(xin)息與控制。無(wu)(wu)(wu)線(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統具有很(hen)高(gao)的(de)(de)靈活性，它能夠滿足現(xian)場中所有環(huan)境使(shi)(shi)(shi)用(yong)(yong)需求并能隨時(shi)(shi)切(qie)換(huan)（如在野外(wai)、戶外(wai)電話等),用(yong)(yong)戶可以在任(ren)何地點(dian)使(shi)(shi)(shi)用(yong)(yong)、隨時(shi)(shi)、隨地進行通(tong)訊。使(shi)(shi)(shi)用(yong)(yong)方便、節(jie)省成本、節(jie)約費用(yong)(yong)。下(xia)面我們來了解(jie)一下(xia)無(wu)(wu)(wu)線(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統它主要是(shi)什么優點(dian)？

1.性能穩定，可靠性高

在(zai)相(xiang)同無(wu)(wu)線(xian)(xian)傳輸距(ju)離下(xia)，無(wu)(wu)線(xian)(xian)傳輸信(xin)號(hao)(hao)(hao)更(geng)穩(wen)(wen)定由于使(shi)(shi)(shi)用(yong)了功率放大器(qi)來對(dui)無(wu)(wu)線(xian)(xian)信(xin)號(hao)(hao)(hao)進行壓縮和(he)(he)放大，使(shi)(shi)(shi)無(wu)(wu)線(xian)(xian)信(xin)號(hao)(hao)(hao)更(geng)加(jia)穩(wen)(wen)定可(ke)靠。無(wu)(wu)線(xian)(xian)信(xin)號(hao)(hao)(hao)在(zai)弱電(dian)磁環(huan)境(jing)下(xia)也(ye)能(neng)保(bao)持(chi)較(jiao)(jiao)好(hao)(hao)的(de)(de)(de)性(xing)能(neng)。無(wu)(wu)線(xian)(xian)對(dui)講系統(tong)具有(you)發(fa)射(she)(she)功率小、抗千擾(rao)能(neng)力(li)強(qiang)(qiang)(與有(you)線(xian)(xian)對(dui)講系統(tong)比(bi)較(jiao)(jiao))和(he)(he)抗電(dian)磁干擾(rao)能(neng)力(li)強(qiang)(qiang)(與有(you)線(xian)(xian)對(dui)講系統(tong)比(bi)較(jiao)(jiao))的(de)(de)(de)特點。無(wu)(wu)線(xian)(xian)對(dui)講系統(tong)發(fa)射(she)(she)信(xin)號(hao)(hao)(hao)在(zai)發(fa)射(she)(she)前和(he)(he)發(fa)射(she)(she)后均能(neng)保(bao)持(chi)良好(hao)(hao)的(de)(de)(de)性(xing)能(neng)，使(shi)(shi)(shi)用(yong)過程中(zhong)，發(fa)射(she)(she)信(xin)號(hao)(hao)(hao)與接收(shou)信(xin)號(hao)(hao)(hao)完全不受任(ren)何千擾(rao)，可(ke)保(bao)持(chi)很好(hao)(hao)的(de)(de)(de)穩(wen)(wen)定性(xing)，具有(you)良好(hao)(hao)的(de)(de)(de)抗千擾(rao)性(xing)和(he)(he)抗低頻(pin)干擾(rao)能(neng)力(li)，即(ji)使(shi)(shi)(shi)在(zai)惡(e)劣的(de)(de)(de)環(huan)境(jing)下(xia)也(ye)能(neng)保(bao)持(chi)較(jiao)(jiao)好(hao)(hao)的(de)(de)(de)性(xing)能(neng)。因此無(wu)(wu)線(xian)(xian)系統(tong)有(you)較(jiao)(jiao)高的(de)(de)(de)可(ke)靠性(xing)。

2.功耗(hao)小、不受(shou)天氣、濕度(du)的(de)影(ying)響

無線(xian)(xian)對(dui)講系統在(zai)(zai)不同(tong)(tong)(tong)的(de)環(huan)(huan)境(jing)中，無線(xian)(xian)通信(xin)設備和有線(xian)(xian)通信(xin)設備一(yi)樣都(dou)要(yao)進(jin)行電(dian)(dian)能的(de)消(xiao)耗(hao)。當(dang)環(huan)(huan)境(jing)溫(wen)度(du)在(zai)(zai)-40°C以(yi)下時(shi)(shi)(shi)，無線(xian)(xian)通信(xin)設備需要(yao)每(mei)(mei)天(tian)工(gong)作8小(xiao)時(shi)(shi)(shi)左右;當(dang)環(huan)(huan)境(jing)溫(wen)度(du)為-20°C時(shi)(shi)(shi)，每(mei)(mei)天(tian)工(gong)作8小(xiao)時(shi)(shi)(shi)左右;當(dang)環(huan)(huan)境(jing)溫(wen)度(du)為-30°C時(shi)(shi)(shi)，每(mei)(mei)天(tian)工(gong)作4小(xiao)時(shi)(shi)(shi)左右。目(mu)前市場上常見的(de)無線(xian)(xian)對(dui)講系統有兩(liang)種(zhong)(zhong)(zhong)電(dian)(dian)源(yuan)(yuan)輸入(ru)方(fang)式(shi)(shi)，一(yi)種(zhong)(zhong)(zhong)是(shi)電(dian)(dian)源(yuan)(yuan)輸入(ru)，另一(yi)種(zhong)(zhong)(zhong)是(shi)電(dian)(dian)源(yuan)(yuan)輸出。從這兩(liang)種(zhong)(zhong)(zhong)方(fang)式(shi)(shi)對(dui)系統的(de)功耗(hao)來(lai)看，電(dian)(dian)源(yuan)(yuan)輸入(ru)方(fang)式(shi)(shi)的(de)功耗(hao)更大一(yi)些，但是(shi)功耗(hao)很(hen)小(xiao)。并且設備的(de)工(gong)作環(huan)(huan)境(jing)不同(tong)(tong)(tong)，對(dui)電(dian)(dian)池的(de)需求量也不同(tong)(tong)(tong)，所以(yi)功耗(hao)也不同(tong)(tong)(tong)。

3信號不受干擾

在(zai)一(yi)(yi)些有(you)干(gan)擾(rao)(rao)(rao)的(de)(de)(de)地方，例如(ru)野外(wai)、機場、工廠等，一(yi)(yi)般采(cai)用(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)方式(shi)。分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)方式(shi)的(de)(de)(de)抗干(gan)擾(rao)(rao)(rao)能(neng)力不強，其抗干(gan)擾(rao)(rao)(rao)能(neng)力主要取(qu)決于射(she)頻(pin)(pin)(pin)(pin)(pin)(pin)功率(lv)(lv)的(de)(de)(de)大(da)小。分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)功率(lv)(lv)一(yi)(yi)般是50dB在(zai)50dB左右時(shi)，其抗干(gan)擾(rao)(rao)(rao)能(neng)力強。但由(you)于分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)的(de)(de)(de)干(gan)擾(rao)(rao)(rao)與(yu)噪聲(主要是周邊(bian)噪聲)具有(you)很強的(de)(de)(de)互(hu)通性(xing)，當分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)發(fa)(fa)(fa)射(she)的(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)(hao)超過50dB時(shi)，其抗千擾(rao)(rao)(rao)能(neng)力就會(hui)(hui)減弱。另(ling)外(wai)，在(zai)一(yi)(yi)些有(you)噪音的(de)(de)(de)環境中(zhong)(zhong)使(shi)用(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)，會(hui)(hui)使(shi)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)信(xin)(xin)號(hao)(hao)(hao)(hao)無法到達(da)發(fa)(fa)(fa)射(she)端的(de)(de)(de)接收機或(huo)者造(zao)成(cheng)發(fa)(fa)(fa)射(she)端信(xin)(xin)號(hao)(hao)(hao)(hao)與(yu)接收端信(xin)(xin)號(hao)(hao)(hao)(hao)的(de)(de)(de)糟合而(er)造(zao)成(cheng)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)或(huo)干(gan)擾(rao)(rao)(rao)(例如(ru)在(zai)使(shi)用(yong)室(shi)外(wai)電話(hua)時(shi)) 。而(er)采(cai)用(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)無線(xian)對(dui)講(jiang)系(xi)統由(you)于發(fa)(fa)(fa)射(she)功率(lv)(lv)小，分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)后的(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)(hao)強度(du)比(bi)有(you)線(xian)對(dui)講(jiang)系(xi)統高(gao)很多(在(zai)實(shi)際使(shi)用(yong)中(zhong)(zhong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)設備一(yi)(yi)般可以(yi)將(jiang)系(xi)統信(xin)(xin)號(hao)(hao)(hao)(hao)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)到50dB以(yi)上),信(xin)(xin)號(hao)(hao)(hao)(hao)不受干(gan)擾(rao)(rao)(rao)。如(ru)果采(cai)用(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)，需要在(zai)較大(da)的(de)(de)(de)回波功率(lv)(lv)下才(cai)能(neng)實(shi)現信(xin)(xin)號(hao)(hao)(hao)(hao)的(de)(de)(de)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)工作(如(ru)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)器發(fa)(fa)(fa)射(she)信(xin)(xin)號(hao)(hao)(hao)(hao)與(yu)接收信(xin)(xin)號(hao)(hao)(hao)(hao)重疊時(shi)產(chan)生的(de)(de)(de)千擾(rao)(rao)(rao))和發(fa)(fa)(fa)送(song)信(xin)(xin)號(hao)(hao)(hao)(hao)強度(du)降低(di)(同頻(pin)(pin)(pin)(pin)(pin)(pin)帶內的(de)(de)(de)兩只天線(xian)對(dui)同一(yi)(yi)信(xin)(xin)道(dao)傳輸的(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)(hao)強度(du)基(ji)本一(yi)(yi)致);如(ru)果采(cai)用(yong)混響技(ji)術(shu)，則可以(yi)實(shi)現對(dui)無線(xian)信(xin)(xin)號(hao)(hao)(hao)(hao)干(gan)擾(rao)(rao)(rao)的(de)(de)(de)抑(yi)制(zhi)或(huo)降低(di)。