由(you)于在(zai)戶(hu)外、室(shi)內等區域，無(wu)線對講(jiang)(jiang)(jiang)(jiang)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)的信(xin)號(hao)強(qiang)度較弱，而且采用(yong)(yong)(yong)(yong)頻率調制(zhi)技(ji)術（如(ru) MHZ、 NMR、 BSI等）產生(sheng)的信(xin)號(hao)傳輸(shu)時延大，傳輸(shu)距離遠。因(yin)此有(you)線對講(jiang)(jiang)(jiang)(jiang)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)不(bu)適合在(zai)戶(hu)外環境使(shi)(shi)用(yong)(yong)(yong)(yong)，特別是在(zai)冬(dong)天及低風速季節(jie)使(shi)(shi)用(yong)(yong)(yong)(yong)。雖然無(wu)線對講(jiang)(jiang)(jiang)(jiang)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)也有(you)著(zhu)不(bu)錯的效果。但由(you)于系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)工作時會(hui)有(you)一定的干擾，使(shi)(shi)對講(jiang)(jiang)(jiang)(jiang)效果下(xia)降，另外在(zai)信(xin)號(hao)較弱時對用(yong)(yong)(yong)(yong)戶(hu)語(yu)音(yin)產生(sheng)了(le)影(ying)響。特別是在(zai)人(ren)員復雜、通信(xin)距離較短或需要(yao)(yao)(yao)較長時間使(shi)(shi)用(yong)(yong)(yong)(yong)時。因(yin)此，更需要(yao)(yao)(yao)有(you)一個可靠(kao)的無(wu)線對講(jiang)(jiang)(jiang)(jiang)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)提供與有(you)線對講(jiang)(jiang)(jiang)(jiang)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)一樣的語(yu)音(yin)信(xin)息與控制(zhi)。無(wu)線對講(jiang)(jiang)(jiang)(jiang)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)具有(you)很高的靈活性，它能夠滿足現場(chang)中所有(you)環境使(shi)(shi)用(yong)(yong)(yong)(yong)需求并(bing)能隨時切換（如(ru)在(zai)野(ye)外、戶(hu)外電話等),用(yong)(yong)(yong)(yong)戶(hu)可以在(zai)任何地點使(shi)(shi)用(yong)(yong)(yong)(yong)、隨時、隨地進行通訊。使(shi)(shi)用(yong)(yong)(yong)(yong)方便、節(jie)省成本(ben)、節(jie)約費用(yong)(yong)(yong)(yong)。下(xia)面我們(men)來了(le)解一下(xia)無(wu)線對講(jiang)(jiang)(jiang)(jiang)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)它主要(yao)(yao)(yao)是什(shen)么(me)優點？

1.性(xing)能(neng)穩定，可(ke)靠(kao)性(xing)高

在(zai)相同無(wu)(wu)(wu)線(xian)(xian)(xian)傳輸(shu)距離下，無(wu)(wu)(wu)線(xian)(xian)(xian)傳輸(shu)信(xin)(xin)號(hao)更(geng)穩(wen)定由于使(shi)用了功率放大器來對(dui)無(wu)(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)進行壓縮和(he)(he)放大，使(shi)無(wu)(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)更(geng)加(jia)穩(wen)定可靠。無(wu)(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)在(zai)弱電磁(ci)環境下也能(neng)(neng)保(bao)持較(jiao)好(hao)(hao)的(de)(de)(de)性能(neng)(neng)。無(wu)(wu)(wu)線(xian)(xian)(xian)對(dui)講(jiang)系(xi)統(tong)具(ju)有發射(she)(she)功率小、抗(kang)(kang)(kang)千擾(rao)(rao)能(neng)(neng)力強(qiang)(與(yu)有線(xian)(xian)(xian)對(dui)講(jiang)系(xi)統(tong)比較(jiao))和(he)(he)抗(kang)(kang)(kang)電磁(ci)干擾(rao)(rao)能(neng)(neng)力強(qiang)(與(yu)有線(xian)(xian)(xian)對(dui)講(jiang)系(xi)統(tong)比較(jiao))的(de)(de)(de)特(te)點。無(wu)(wu)(wu)線(xian)(xian)(xian)對(dui)講(jiang)系(xi)統(tong)發射(she)(she)信(xin)(xin)號(hao)在(zai)發射(she)(she)前和(he)(he)發射(she)(she)后均能(neng)(neng)保(bao)持良好(hao)(hao)的(de)(de)(de)性能(neng)(neng)，使(shi)用過程中，發射(she)(she)信(xin)(xin)號(hao)與(yu)接收信(xin)(xin)號(hao)完全不受任何千擾(rao)(rao)，可保(bao)持很好(hao)(hao)的(de)(de)(de)穩(wen)定性，具(ju)有良好(hao)(hao)的(de)(de)(de)抗(kang)(kang)(kang)千擾(rao)(rao)性和(he)(he)抗(kang)(kang)(kang)低頻(pin)干擾(rao)(rao)能(neng)(neng)力，即使(shi)在(zai)惡(e)劣的(de)(de)(de)環境下也能(neng)(neng)保(bao)持較(jiao)好(hao)(hao)的(de)(de)(de)性能(neng)(neng)。因此無(wu)(wu)(wu)線(xian)(xian)(xian)系(xi)統(tong)有較(jiao)高(gao)的(de)(de)(de)可靠性。

2.功耗小、不受天氣、濕度的(de)影(ying)響

無(wu)線對(dui)講(jiang)系(xi)統(tong)在不(bu)(bu)同(tong)的(de)(de)環境中，無(wu)線通信設(she)(she)備(bei)和有(you)線通信設(she)(she)備(bei)一樣都要進行電能的(de)(de)消耗。當(dang)環境溫度(du)在-40°C以(yi)(yi)下時(shi)(shi)(shi)(shi)，無(wu)線通信設(she)(she)備(bei)需(xu)要每(mei)天工(gong)作(zuo)8小時(shi)(shi)(shi)(shi)左(zuo)右(you);當(dang)環境溫度(du)為-20°C時(shi)(shi)(shi)(shi)，每(mei)天工(gong)作(zuo)8小時(shi)(shi)(shi)(shi)左(zuo)右(you);當(dang)環境溫度(du)為-30°C時(shi)(shi)(shi)(shi)，每(mei)天工(gong)作(zuo)4小時(shi)(shi)(shi)(shi)左(zuo)右(you)。目前市(shi)場上(shang)常(chang)見的(de)(de)無(wu)線對(dui)講(jiang)系(xi)統(tong)有(you)兩種電源(yuan)輸(shu)入(ru)方式，一種是(shi)(shi)電源(yuan)輸(shu)入(ru)，另一種是(shi)(shi)電源(yuan)輸(shu)出。從這兩種方式對(dui)系(xi)統(tong)的(de)(de)功耗來看，電源(yuan)輸(shu)入(ru)方式的(de)(de)功耗更大一些(xie)，但是(shi)(shi)功耗很(hen)小。并且設(she)(she)備(bei)的(de)(de)工(gong)作(zuo)環境不(bu)(bu)同(tong)，對(dui)電池的(de)(de)需(xu)求量(liang)也(ye)不(bu)(bu)同(tong)，所以(yi)(yi)功耗也(ye)不(bu)(bu)同(tong)。

3信號不受干擾

在(zai)一(yi)(yi)些(xie)有(you)干(gan)(gan)擾(rao)(rao)的(de)(de)(de)地方(fang)，例(li)如野外、機場、工(gong)廠(chang)等(deng)，一(yi)(yi)般(ban)采用分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)方(fang)式。分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)方(fang)式的(de)(de)(de)抗干(gan)(gan)擾(rao)(rao)能(neng)力(li)不(bu)強，其(qi)抗干(gan)(gan)擾(rao)(rao)能(neng)力(li)主(zhu)要取決于射(she)(she)(she)頻(pin)(pin)(pin)(pin)功(gong)率的(de)(de)(de)大小(xiao)。分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技術的(de)(de)(de)功(gong)率一(yi)(yi)般(ban)是50dB在(zai)50dB左右(you)時(shi)，其(qi)抗干(gan)(gan)擾(rao)(rao)能(neng)力(li)強。但由于分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)的(de)(de)(de)干(gan)(gan)擾(rao)(rao)與噪聲(主(zhu)要是周邊噪聲)具有(you)很強的(de)(de)(de)互通性，當分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)發(fa)射(she)(she)(she)的(de)(de)(de)信(xin)號(hao)超過50dB時(shi)，其(qi)抗千擾(rao)(rao)能(neng)力(li)就會減弱。另外，在(zai)一(yi)(yi)些(xie)有(you)噪音的(de)(de)(de)環境中使(shi)用分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技術，會使(shi)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)信(xin)號(hao)無法到達發(fa)射(she)(she)(she)端的(de)(de)(de)接(jie)收(shou)機或(huo)者造成(cheng)發(fa)射(she)(she)(she)端信(xin)號(hao)與接(jie)收(shou)端信(xin)號(hao)的(de)(de)(de)糟(zao)合(he)而造成(cheng)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)或(huo)干(gan)(gan)擾(rao)(rao)(例(li)如在(zai)使(shi)用室外電話時(shi)) 。而采用分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技術的(de)(de)(de)無線(xian)對(dui)講系統由于發(fa)射(she)(she)(she)功(gong)率小(xiao)，分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)后的(de)(de)(de)信(xin)號(hao)強度(du)(du)比有(you)線(xian)對(dui)講系統高很多(duo)(在(zai)實(shi)際使(shi)用中分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)設(she)備一(yi)(yi)般(ban)可(ke)以(yi)將系統信(xin)號(hao)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)到50dB以(yi)上),信(xin)號(hao)不(bu)受干(gan)(gan)擾(rao)(rao)。如果(guo)采用分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技術，需要在(zai)較(jiao)大的(de)(de)(de)回波功(gong)率下(xia)才能(neng)實(shi)現(xian)信(xin)號(hao)的(de)(de)(de)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)工(gong)作(zuo)(如分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)器(qi)發(fa)射(she)(she)(she)信(xin)號(hao)與接(jie)收(shou)信(xin)號(hao)重疊時(shi)產生(sheng)的(de)(de)(de)千擾(rao)(rao))和發(fa)送信(xin)號(hao)強度(du)(du)降低(di)(同頻(pin)(pin)(pin)(pin)帶內的(de)(de)(de)兩只天線(xian)對(dui)同一(yi)(yi)信(xin)道傳(chuan)輸的(de)(de)(de)信(xin)號(hao)強度(du)(du)基本一(yi)(yi)致);如果(guo)采用混(hun)響技術，則可(ke)以(yi)實(shi)現(xian)對(dui)無線(xian)信(xin)號(hao)干(gan)(gan)擾(rao)(rao)的(de)(de)(de)抑制或(huo)降低(di)。