由(you)于在(zai)戶(hu)外(wai)、室(shi)內等區(qu)域，無(wu)(wu)線(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)的信(xin)(xin)(xin)號強度較弱(ruo)，而(er)且采(cai)用(yong)(yong)(yong)(yong)頻率(lv)調制(zhi)技術（如 MHZ、 NMR、 BSI等）產生的信(xin)(xin)(xin)號傳輸時(shi)(shi)(shi)延大，傳輸距離遠。因此(ci)有線(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)不(bu)適合在(zai)戶(hu)外(wai)環(huan)境(jing)使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)，特別是(shi)在(zai)冬天(tian)及低風速季節使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)。雖然(ran)無(wu)(wu)線(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)也有著不(bu)錯(cuo)的效果。但由(you)于系(xi)(xi)統(tong)(tong)工作時(shi)(shi)(shi)會有一定的干擾，使(shi)(shi)(shi)對(dui)(dui)(dui)講(jiang)(jiang)效果下降，另外(wai)在(zai)信(xin)(xin)(xin)號較弱(ruo)時(shi)(shi)(shi)對(dui)(dui)(dui)用(yong)(yong)(yong)(yong)戶(hu)語音(yin)產生了影響。特別是(shi)在(zai)人員復(fu)雜、通信(xin)(xin)(xin)距離較短或需(xu)要較長(chang)時(shi)(shi)(shi)間使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)時(shi)(shi)(shi)。因此(ci)，更(geng)需(xu)要有一個(ge)可(ke)靠的無(wu)(wu)線(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)提供(gong)與有線(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)一樣的語音(yin)信(xin)(xin)(xin)息與控制(zhi)。無(wu)(wu)線(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)具有很高的靈活(huo)性(xing)，它(ta)能(neng)夠滿(man)足現(xian)場(chang)中所有環(huan)境(jing)使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)需(xu)求并能(neng)隨(sui)(sui)時(shi)(shi)(shi)切換（如在(zai)野外(wai)、戶(hu)外(wai)電話(hua)等),用(yong)(yong)(yong)(yong)戶(hu)可(ke)以在(zai)任何地(di)點使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)、隨(sui)(sui)時(shi)(shi)(shi)、隨(sui)(sui)地(di)進行通訊。使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)方便、節省成本、節約費用(yong)(yong)(yong)(yong)。下面(mian)我們來了解(jie)一下無(wu)(wu)線(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)它(ta)主要是(shi)什么優點？

1.性能(neng)穩定，可(ke)靠性高

在(zai)相(xiang)同(tong)無(wu)(wu)線傳(chuan)輸距(ju)離下，無(wu)(wu)線傳(chuan)輸信(xin)號(hao)(hao)更(geng)穩(wen)(wen)定由于使(shi)用了功率(lv)放(fang)大(da)器(qi)來對(dui)(dui)無(wu)(wu)線信(xin)號(hao)(hao)進行(xing)壓縮(suo)和(he)放(fang)大(da)，使(shi)無(wu)(wu)線信(xin)號(hao)(hao)更(geng)加穩(wen)(wen)定可靠(kao)。無(wu)(wu)線信(xin)號(hao)(hao)在(zai)弱(ruo)電磁環境(jing)下也能保(bao)持較(jiao)好(hao)的(de)性(xing)能。無(wu)(wu)線對(dui)(dui)講系(xi)(xi)(xi)統具有(you)(you)(you)發(fa)射(she)功率(lv)小、抗(kang)千擾能力強(qiang)(與(yu)有(you)(you)(you)線對(dui)(dui)講系(xi)(xi)(xi)統比(bi)(bi)較(jiao))和(he)抗(kang)電磁干(gan)擾能力強(qiang)(與(yu)有(you)(you)(you)線對(dui)(dui)講系(xi)(xi)(xi)統比(bi)(bi)較(jiao))的(de)特點。無(wu)(wu)線對(dui)(dui)講系(xi)(xi)(xi)統發(fa)射(she)信(xin)號(hao)(hao)在(zai)發(fa)射(she)前和(he)發(fa)射(she)后均能保(bao)持良好(hao)的(de)性(xing)能，使(shi)用過程中，發(fa)射(she)信(xin)號(hao)(hao)與(yu)接(jie)收信(xin)號(hao)(hao)完全不受任何千擾，可保(bao)持很好(hao)的(de)穩(wen)(wen)定性(xing)，具有(you)(you)(you)良好(hao)的(de)抗(kang)千擾性(xing)和(he)抗(kang)低頻干(gan)擾能力，即使(shi)在(zai)惡劣的(de)環境(jing)下也能保(bao)持較(jiao)好(hao)的(de)性(xing)能。因此(ci)無(wu)(wu)線系(xi)(xi)(xi)統有(you)(you)(you)較(jiao)高的(de)可靠(kao)性(xing)。

2.功耗小、不受天氣、濕度的影響

無線(xian)對(dui)講(jiang)系統在不(bu)同(tong)(tong)的(de)(de)環(huan)境(jing)中，無線(xian)通信(xin)設(she)備和有線(xian)通信(xin)設(she)備一樣都要進行電(dian)(dian)能的(de)(de)消耗。當環(huan)境(jing)溫度(du)在-40°C以下時(shi)，無線(xian)通信(xin)設(she)備需要每天(tian)工(gong)作(zuo)(zuo)8小(xiao)時(shi)左(zuo)右;當環(huan)境(jing)溫度(du)為(wei)-20°C時(shi)，每天(tian)工(gong)作(zuo)(zuo)8小(xiao)時(shi)左(zuo)右;當環(huan)境(jing)溫度(du)為(wei)-30°C時(shi)，每天(tian)工(gong)作(zuo)(zuo)4小(xiao)時(shi)左(zuo)右。目前(qian)市場上常見的(de)(de)無線(xian)對(dui)講(jiang)系統有兩(liang)種(zhong)電(dian)(dian)源(yuan)輸(shu)入(ru)方(fang)式，一種(zhong)是(shi)電(dian)(dian)源(yuan)輸(shu)入(ru)，另一種(zhong)是(shi)電(dian)(dian)源(yuan)輸(shu)出。從這兩(liang)種(zhong)方(fang)式對(dui)系統的(de)(de)功(gong)耗來看，電(dian)(dian)源(yuan)輸(shu)入(ru)方(fang)式的(de)(de)功(gong)耗更大一些，但是(shi)功(gong)耗很小(xiao)。并且設(she)備的(de)(de)工(gong)作(zuo)(zuo)環(huan)境(jing)不(bu)同(tong)(tong)，對(dui)電(dian)(dian)池的(de)(de)需求量也(ye)不(bu)同(tong)(tong)，所以功(gong)耗也(ye)不(bu)同(tong)(tong)。

3信號不受干擾

在(zai)一些有干擾(rao)(rao)(rao)的(de)地方，例如野外、機場、工廠等，一般采用(yong)(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)方式。分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)方式的(de)抗干擾(rao)(rao)(rao)能(neng)(neng)(neng)力(li)(li)不強，其抗干擾(rao)(rao)(rao)能(neng)(neng)(neng)力(li)(li)主要(yao)取(qu)決于射(she)頻(pin)(pin)(pin)(pin)(pin)功率(lv)(lv)的(de)大小。分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)的(de)功率(lv)(lv)一般是(shi)50dB在(zai)50dB左(zuo)右時(shi)，其抗干擾(rao)(rao)(rao)能(neng)(neng)(neng)力(li)(li)強。但由于分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)的(de)干擾(rao)(rao)(rao)與(yu)(yu)噪聲(主要(yao)是(shi)周邊噪聲)具有很(hen)強的(de)互(hu)通性，當分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)發(fa)(fa)射(she)的(de)信(xin)號(hao)(hao)(hao)超過(guo)50dB時(shi)，其抗千(qian)擾(rao)(rao)(rao)能(neng)(neng)(neng)力(li)(li)就(jiu)會減弱。另外，在(zai)一些有噪音(yin)的(de)環(huan)境中使用(yong)(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)，會使分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)信(xin)號(hao)(hao)(hao)無(wu)法(fa)到達發(fa)(fa)射(she)端的(de)接(jie)(jie)收機或(huo)者造成(cheng)(cheng)發(fa)(fa)射(she)端信(xin)號(hao)(hao)(hao)與(yu)(yu)接(jie)(jie)收端信(xin)號(hao)(hao)(hao)的(de)糟合而(er)造成(cheng)(cheng)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)或(huo)干擾(rao)(rao)(rao)(例如在(zai)使用(yong)(yong)(yong)室外電話時(shi)) 。而(er)采用(yong)(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)的(de)無(wu)線對(dui)(dui)講(jiang)系統(tong)(tong)由于發(fa)(fa)射(she)功率(lv)(lv)小，分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)后的(de)信(xin)號(hao)(hao)(hao)強度(du)(du)比有線對(dui)(dui)講(jiang)系統(tong)(tong)高很(hen)多(在(zai)實(shi)際(ji)使用(yong)(yong)(yong)中分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)設備一般可以(yi)(yi)將系統(tong)(tong)信(xin)號(hao)(hao)(hao)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)到50dB以(yi)(yi)上),信(xin)號(hao)(hao)(hao)不受干擾(rao)(rao)(rao)。如果采用(yong)(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)，需要(yao)在(zai)較大的(de)回波功率(lv)(lv)下才能(neng)(neng)(neng)實(shi)現信(xin)號(hao)(hao)(hao)的(de)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)工作(如分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)器(qi)發(fa)(fa)射(she)信(xin)號(hao)(hao)(hao)與(yu)(yu)接(jie)(jie)收信(xin)號(hao)(hao)(hao)重疊(die)時(shi)產生(sheng)的(de)千(qian)擾(rao)(rao)(rao))和(he)發(fa)(fa)送信(xin)號(hao)(hao)(hao)強度(du)(du)降低(同(tong)頻(pin)(pin)(pin)(pin)(pin)帶(dai)內(nei)的(de)兩只天線對(dui)(dui)同(tong)一信(xin)道傳輸的(de)信(xin)號(hao)(hao)(hao)強度(du)(du)基本一致(zhi));如果采用(yong)(yong)(yong)混響(xiang)技(ji)術(shu)，則可以(yi)(yi)實(shi)現對(dui)(dui)無(wu)線信(xin)號(hao)(hao)(hao)干擾(rao)(rao)(rao)的(de)抑制或(huo)降低。