由(you)于(yu)在戶(hu)外(wai)、室內等(deng)區域，無(wu)(wu)線(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)的(de)信(xin)(xin)號(hao)強度較(jiao)(jiao)弱，而(er)且采用(yong)(yong)(yong)頻率調制技術（如(ru) MHZ、 NMR、 BSI等(deng)）產生(sheng)的(de)信(xin)(xin)號(hao)傳(chuan)輸時(shi)延大(da)，傳(chuan)輸距離(li)遠。因(yin)此(ci)有(you)(you)線(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)不適合(he)在戶(hu)外(wai)環(huan)境使(shi)用(yong)(yong)(yong)，特別(bie)(bie)是(shi)在冬天(tian)及(ji)低風速季節使(shi)用(yong)(yong)(yong)。雖然(ran)無(wu)(wu)線(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)也有(you)(you)著不錯的(de)效(xiao)果。但由(you)于(yu)系(xi)統(tong)工作時(shi)會有(you)(you)一定的(de)干擾，使(shi)對(dui)(dui)講(jiang)(jiang)效(xiao)果下降，另(ling)外(wai)在信(xin)(xin)號(hao)較(jiao)(jiao)弱時(shi)對(dui)(dui)用(yong)(yong)(yong)戶(hu)語音(yin)產生(sheng)了影響。特別(bie)(bie)是(shi)在人(ren)員復雜、通(tong)信(xin)(xin)距離(li)較(jiao)(jiao)短或需要(yao)較(jiao)(jiao)長時(shi)間(jian)使(shi)用(yong)(yong)(yong)時(shi)。因(yin)此(ci)，更需要(yao)有(you)(you)一個(ge)可靠的(de)無(wu)(wu)線(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)提供(gong)與(yu)有(you)(you)線(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)一樣的(de)語音(yin)信(xin)(xin)息與(yu)控制。無(wu)(wu)線(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)具有(you)(you)很高的(de)靈(ling)活性，它能夠(gou)滿足現場(chang)中所(suo)有(you)(you)環(huan)境使(shi)用(yong)(yong)(yong)需求并能隨時(shi)切換（如(ru)在野外(wai)、戶(hu)外(wai)電話等(deng)),用(yong)(yong)(yong)戶(hu)可以在任何地(di)(di)點使(shi)用(yong)(yong)(yong)、隨時(shi)、隨地(di)(di)進(jin)行通(tong)訊。使(shi)用(yong)(yong)(yong)方便、節省成本、節約費用(yong)(yong)(yong)。下面我們來了解一下無(wu)(wu)線(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)它主要(yao)是(shi)什(shen)么(me)優點？

1.性能穩定，可靠性高

在(zai)(zai)(zai)相(xiang)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(xin)(xin)號(hao)更穩(wen)(wen)定(ding)(ding)(ding)由于使(shi)用了功率放大(da)器來(lai)對(dui)無(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)進行壓縮(suo)和放大(da)，使(shi)無(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)更加穩(wen)(wen)定(ding)(ding)(ding)可靠。無(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)在(zai)(zai)(zai)弱電磁環境下也能(neng)(neng)保(bao)持較好(hao)(hao)的性(xing)(xing)能(neng)(neng)。無(wu)線(xian)(xian)(xian)對(dui)講系統(tong)具(ju)有(you)發射功率小、抗千擾能(neng)(neng)力強(與(yu)(yu)有(you)線(xian)(xian)(xian)對(dui)講系統(tong)比(bi)較)和抗電磁干擾能(neng)(neng)力強(與(yu)(yu)有(you)線(xian)(xian)(xian)對(dui)講系統(tong)比(bi)較)的特(te)點(dian)。無(wu)線(xian)(xian)(xian)對(dui)講系統(tong)發射信(xin)(xin)號(hao)在(zai)(zai)(zai)發射前和發射后(hou)均能(neng)(neng)保(bao)持良好(hao)(hao)的性(xing)(xing)能(neng)(neng)，使(shi)用過程中，發射信(xin)(xin)號(hao)與(yu)(yu)接收(shou)信(xin)(xin)號(hao)完全(quan)不(bu)受任何(he)千擾，可保(bao)持很好(hao)(hao)的穩(wen)(wen)定(ding)(ding)(ding)性(xing)(xing)，具(ju)有(you)良好(hao)(hao)的抗千擾性(xing)(xing)和抗低頻干擾能(neng)(neng)力，即使(shi)在(zai)(zai)(zai)惡劣的環境下也能(neng)(neng)保(bao)持較好(hao)(hao)的性(xing)(xing)能(neng)(neng)。因此(ci)無(wu)線(xian)(xian)(xian)系統(tong)有(you)較高的可靠性(xing)(xing)。

2.功(gong)耗小、不受天氣、濕(shi)度的(de)影響

無(wu)線(xian)對(dui)講系(xi)統在不(bu)同(tong)的(de)(de)環(huan)境(jing)(jing)中，無(wu)線(xian)通(tong)信(xin)(xin)設備和(he)有線(xian)通(tong)信(xin)(xin)設備一(yi)(yi)樣都要進(jin)行(xing)電(dian)(dian)能的(de)(de)消(xiao)耗(hao)(hao)。當環(huan)境(jing)(jing)溫(wen)度(du)在-40°C以下時，無(wu)線(xian)通(tong)信(xin)(xin)設備需(xu)要每(mei)(mei)天(tian)工(gong)作(zuo)8小時左(zuo)(zuo)右;當環(huan)境(jing)(jing)溫(wen)度(du)為-20°C時，每(mei)(mei)天(tian)工(gong)作(zuo)8小時左(zuo)(zuo)右;當環(huan)境(jing)(jing)溫(wen)度(du)為-30°C時，每(mei)(mei)天(tian)工(gong)作(zuo)4小時左(zuo)(zuo)右。目前市(shi)場上常見的(de)(de)無(wu)線(xian)對(dui)講系(xi)統有兩(liang)種(zhong)電(dian)(dian)源(yuan)(yuan)輸(shu)入(ru)方式，一(yi)(yi)種(zhong)是(shi)電(dian)(dian)源(yuan)(yuan)輸(shu)入(ru)，另一(yi)(yi)種(zhong)是(shi)電(dian)(dian)源(yuan)(yuan)輸(shu)出。從這兩(liang)種(zhong)方式對(dui)系(xi)統的(de)(de)功耗(hao)(hao)來看，電(dian)(dian)源(yuan)(yuan)輸(shu)入(ru)方式的(de)(de)功耗(hao)(hao)更(geng)大一(yi)(yi)些(xie)，但是(shi)功耗(hao)(hao)很(hen)小。并且設備的(de)(de)工(gong)作(zuo)環(huan)境(jing)(jing)不(bu)同(tong)，對(dui)電(dian)(dian)池的(de)(de)需(xu)求量也不(bu)同(tong)，所以功耗(hao)(hao)也不(bu)同(tong)。

3信號不受干擾

在(zai)一(yi)(yi)(yi)些有干(gan)擾(rao)(rao)(rao)的(de)(de)地方(fang)，例(li)如(ru)野外(wai)(wai)、機場、工(gong)廠等，一(yi)(yi)(yi)般(ban)采(cai)用(yong)分(fen)(fen)(fen)(fen)頻方(fang)式(shi)。分(fen)(fen)(fen)(fen)頻方(fang)式(shi)的(de)(de)抗(kang)(kang)干(gan)擾(rao)(rao)(rao)能(neng)力(li)不強(qiang)(qiang)，其(qi)(qi)抗(kang)(kang)干(gan)擾(rao)(rao)(rao)能(neng)力(li)主要(yao)取(qu)決(jue)于(yu)射(she)頻功率(lv)的(de)(de)大小。分(fen)(fen)(fen)(fen)頻技(ji)術的(de)(de)功率(lv)一(yi)(yi)(yi)般(ban)是50dB在(zai)50dB左右時，其(qi)(qi)抗(kang)(kang)干(gan)擾(rao)(rao)(rao)能(neng)力(li)強(qiang)(qiang)。但(dan)由于(yu)分(fen)(fen)(fen)(fen)頻的(de)(de)干(gan)擾(rao)(rao)(rao)與噪(zao)聲(sheng)(sheng)(主要(yao)是周邊噪(zao)聲(sheng)(sheng))具有很(hen)強(qiang)(qiang)的(de)(de)互通性，當分(fen)(fen)(fen)(fen)頻發(fa)射(she)的(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)超(chao)過50dB時，其(qi)(qi)抗(kang)(kang)千(qian)擾(rao)(rao)(rao)能(neng)力(li)就會(hui)減(jian)弱(ruo)。另(ling)外(wai)(wai)，在(zai)一(yi)(yi)(yi)些有噪(zao)音(yin)的(de)(de)環境中(zhong)使(shi)用(yong)分(fen)(fen)(fen)(fen)頻技(ji)術，會(hui)使(shi)分(fen)(fen)(fen)(fen)頻信(xin)(xin)(xin)號(hao)(hao)(hao)無(wu)法到達(da)發(fa)射(she)端的(de)(de)接收(shou)機或者造成(cheng)發(fa)射(she)端信(xin)(xin)(xin)號(hao)(hao)(hao)與接收(shou)端信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)糟合而(er)造成(cheng)分(fen)(fen)(fen)(fen)頻或干(gan)擾(rao)(rao)(rao)(例(li)如(ru)在(zai)使(shi)用(yong)室(shi)外(wai)(wai)電(dian)話(hua)時) 。而(er)采(cai)用(yong)分(fen)(fen)(fen)(fen)頻技(ji)術的(de)(de)無(wu)線對(dui)(dui)講(jiang)系統由于(yu)發(fa)射(she)功率(lv)小，分(fen)(fen)(fen)(fen)頻后的(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)度比(bi)有線對(dui)(dui)講(jiang)系統高很(hen)多(在(zai)實(shi)際(ji)使(shi)用(yong)中(zhong)分(fen)(fen)(fen)(fen)頻設備(bei)一(yi)(yi)(yi)般(ban)可以將系統信(xin)(xin)(xin)號(hao)(hao)(hao)分(fen)(fen)(fen)(fen)頻到50dB以上(shang)),信(xin)(xin)(xin)號(hao)(hao)(hao)不受(shou)干(gan)擾(rao)(rao)(rao)。如(ru)果(guo)采(cai)用(yong)分(fen)(fen)(fen)(fen)頻技(ji)術，需(xu)要(yao)在(zai)較大的(de)(de)回(hui)波功率(lv)下才能(neng)實(shi)現(xian)信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)分(fen)(fen)(fen)(fen)頻工(gong)作(zuo)(如(ru)分(fen)(fen)(fen)(fen)頻器發(fa)射(she)信(xin)(xin)(xin)號(hao)(hao)(hao)與接收(shou)信(xin)(xin)(xin)號(hao)(hao)(hao)重疊時產生的(de)(de)千(qian)擾(rao)(rao)(rao))和(he)發(fa)送信(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)度降低(di)(同頻帶內的(de)(de)兩只(zhi)天線對(dui)(dui)同一(yi)(yi)(yi)信(xin)(xin)(xin)道(dao)傳(chuan)輸的(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)度基本一(yi)(yi)(yi)致);如(ru)果(guo)采(cai)用(yong)混響技(ji)術，則(ze)可以實(shi)現(xian)對(dui)(dui)無(wu)線信(xin)(xin)(xin)號(hao)(hao)(hao)干(gan)擾(rao)(rao)(rao)的(de)(de)抑(yi)制或降低(di)。