由于在(zai)戶(hu)(hu)外(wai)(wai)、室內等區域，無(wu)線對講(jiang)系(xi)統(tong)的(de)信(xin)號強度較弱，而且采用(yong)頻率調制(zhi)技術(shu)（如 MHZ、 NMR、 BSI等）產(chan)生(sheng)(sheng)的(de)信(xin)號傳輸時延大(da)，傳輸距(ju)離(li)遠。因此(ci)有線對講(jiang)系(xi)統(tong)不(bu)適合(he)在(zai)戶(hu)(hu)外(wai)(wai)環(huan)境使(shi)(shi)用(yong)，特別是在(zai)冬天及低風(feng)速季節使(shi)(shi)用(yong)。雖然無(wu)線對講(jiang)系(xi)統(tong)也有著不(bu)錯的(de)效(xiao)果。但由于系(xi)統(tong)工作時會有一定的(de)干擾，使(shi)(shi)對講(jiang)效(xiao)果下(xia)降，另外(wai)(wai)在(zai)信(xin)號較弱時對用(yong)戶(hu)(hu)語音(yin)產(chan)生(sheng)(sheng)了影響。特別是在(zai)人員復雜、通(tong)信(xin)距(ju)離(li)較短或需(xu)要較長(chang)時間使(shi)(shi)用(yong)時。因此(ci)，更(geng)需(xu)要有一個可(ke)靠的(de)無(wu)線對講(jiang)系(xi)統(tong)提供與有線對講(jiang)系(xi)統(tong)一樣的(de)語音(yin)信(xin)息與控制(zhi)。無(wu)線對講(jiang)系(xi)統(tong)具(ju)有很(hen)高的(de)靈活(huo)性，它(ta)能(neng)夠(gou)滿(man)足現場中所有環(huan)境使(shi)(shi)用(yong)需(xu)求并能(neng)隨(sui)時切(qie)換（如在(zai)野(ye)外(wai)(wai)、戶(hu)(hu)外(wai)(wai)電話等),用(yong)戶(hu)(hu)可(ke)以(yi)在(zai)任何地(di)(di)點(dian)使(shi)(shi)用(yong)、隨(sui)時、隨(sui)地(di)(di)進行通(tong)訊。使(shi)(shi)用(yong)方便、節省成本、節約(yue)費用(yong)。下(xia)面我們(men)來(lai)了解一下(xia)無(wu)線對講(jiang)系(xi)統(tong)它(ta)主要是什么優點(dian)？

1.性能穩定，可靠性高

在(zai)相(xiang)同無(wu)(wu)線(xian)(xian)(xian)傳(chuan)輸(shu)距離下(xia)，無(wu)(wu)線(xian)(xian)(xian)傳(chuan)輸(shu)信(xin)(xin)號(hao)更(geng)穩(wen)定(ding)由于(yu)使(shi)用了功率(lv)放大器(qi)來對無(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)進行壓縮和(he)放大，使(shi)無(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)更(geng)加穩(wen)定(ding)可(ke)靠(kao)。無(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)在(zai)弱(ruo)電磁(ci)環境下(xia)也(ye)能(neng)(neng)保(bao)持較(jiao)(jiao)(jiao)好(hao)的(de)(de)(de)性(xing)(xing)能(neng)(neng)。無(wu)(wu)線(xian)(xian)(xian)對講系(xi)統具(ju)有發(fa)射功率(lv)小、抗千(qian)擾(rao)能(neng)(neng)力強(qiang)(與有線(xian)(xian)(xian)對講系(xi)統比較(jiao)(jiao)(jiao))和(he)抗電磁(ci)干擾(rao)能(neng)(neng)力強(qiang)(與有線(xian)(xian)(xian)對講系(xi)統比較(jiao)(jiao)(jiao))的(de)(de)(de)特點(dian)。無(wu)(wu)線(xian)(xian)(xian)對講系(xi)統發(fa)射信(xin)(xin)號(hao)在(zai)發(fa)射前和(he)發(fa)射后均能(neng)(neng)保(bao)持良好(hao)的(de)(de)(de)性(xing)(xing)能(neng)(neng)，使(shi)用過程中(zhong)，發(fa)射信(xin)(xin)號(hao)與接收信(xin)(xin)號(hao)完全不受任何千(qian)擾(rao)，可(ke)保(bao)持很好(hao)的(de)(de)(de)穩(wen)定(ding)性(xing)(xing)，具(ju)有良好(hao)的(de)(de)(de)抗千(qian)擾(rao)性(xing)(xing)和(he)抗低頻干擾(rao)能(neng)(neng)力，即使(shi)在(zai)惡劣的(de)(de)(de)環境下(xia)也(ye)能(neng)(neng)保(bao)持較(jiao)(jiao)(jiao)好(hao)的(de)(de)(de)性(xing)(xing)能(neng)(neng)。因此無(wu)(wu)線(xian)(xian)(xian)系(xi)統有較(jiao)(jiao)(jiao)高的(de)(de)(de)可(ke)靠(kao)性(xing)(xing)。

2.功耗(hao)小(xiao)、不受(shou)天氣(qi)、濕度(du)的影響

無(wu)線對(dui)講系統在不(bu)同的(de)環(huan)境(jing)(jing)中，無(wu)線通(tong)信設備(bei)和(he)有線通(tong)信設備(bei)一樣都要進行電(dian)(dian)(dian)能的(de)消耗(hao)。當(dang)(dang)環(huan)境(jing)(jing)溫度在-40°C以下時(shi)，無(wu)線通(tong)信設備(bei)需(xu)要每天工(gong)作8小時(shi)左(zuo)(zuo)右;當(dang)(dang)環(huan)境(jing)(jing)溫度為(wei)-20°C時(shi)，每天工(gong)作8小時(shi)左(zuo)(zuo)右;當(dang)(dang)環(huan)境(jing)(jing)溫度為(wei)-30°C時(shi)，每天工(gong)作4小時(shi)左(zuo)(zuo)右。目前市(shi)場(chang)上常見的(de)無(wu)線對(dui)講系統有兩(liang)種(zhong)(zhong)電(dian)(dian)(dian)源(yuan)輸入(ru)方(fang)式，一種(zhong)(zhong)是(shi)電(dian)(dian)(dian)源(yuan)輸入(ru)，另一種(zhong)(zhong)是(shi)電(dian)(dian)(dian)源(yuan)輸出。從這兩(liang)種(zhong)(zhong)方(fang)式對(dui)系統的(de)功(gong)(gong)耗(hao)來看(kan)，電(dian)(dian)(dian)源(yuan)輸入(ru)方(fang)式的(de)功(gong)(gong)耗(hao)更大一些，但是(shi)功(gong)(gong)耗(hao)很小。并且設備(bei)的(de)工(gong)作環(huan)境(jing)(jing)不(bu)同，對(dui)電(dian)(dian)(dian)池(chi)的(de)需(xu)求量(liang)也不(bu)同，所以功(gong)(gong)耗(hao)也不(bu)同。

3信號不受干擾

在一些(xie)(xie)有干(gan)擾的(de)(de)(de)(de)(de)地方，例如(ru)野外、機(ji)場、工(gong)廠等，一般(ban)采(cai)用(yong)(yong)分(fen)(fen)(fen)頻(pin)方式(shi)。分(fen)(fen)(fen)頻(pin)方式(shi)的(de)(de)(de)(de)(de)抗(kang)(kang)干(gan)擾能(neng)力不(bu)強(qiang)(qiang)，其抗(kang)(kang)干(gan)擾能(neng)力主要(yao)取決于射頻(pin)功(gong)(gong)率(lv)的(de)(de)(de)(de)(de)大小(xiao)。分(fen)(fen)(fen)頻(pin)技(ji)術(shu)(shu)的(de)(de)(de)(de)(de)功(gong)(gong)率(lv)一般(ban)是(shi)50dB在50dB左右時(shi)，其抗(kang)(kang)干(gan)擾能(neng)力強(qiang)(qiang)。但(dan)由(you)于分(fen)(fen)(fen)頻(pin)的(de)(de)(de)(de)(de)干(gan)擾與(yu)噪聲(主要(yao)是(shi)周邊(bian)噪聲)具有很強(qiang)(qiang)的(de)(de)(de)(de)(de)互通性，當分(fen)(fen)(fen)頻(pin)發(fa)射的(de)(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)超過50dB時(shi)，其抗(kang)(kang)千擾能(neng)力就(jiu)會減(jian)弱。另外，在一些(xie)(xie)有噪音的(de)(de)(de)(de)(de)環境中(zhong)使(shi)用(yong)(yong)分(fen)(fen)(fen)頻(pin)技(ji)術(shu)(shu)，會使(shi)分(fen)(fen)(fen)頻(pin)信(xin)(xin)號(hao)(hao)無(wu)(wu)(wu)法到(dao)達發(fa)射端的(de)(de)(de)(de)(de)接(jie)收機(ji)或(huo)者造成發(fa)射端信(xin)(xin)號(hao)(hao)與(yu)接(jie)收端信(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)(de)糟合(he)而造成分(fen)(fen)(fen)頻(pin)或(huo)干(gan)擾(例如(ru)在使(shi)用(yong)(yong)室外電(dian)話時(shi)) 。而采(cai)用(yong)(yong)分(fen)(fen)(fen)頻(pin)技(ji)術(shu)(shu)的(de)(de)(de)(de)(de)無(wu)(wu)(wu)線對(dui)(dui)講(jiang)系(xi)統(tong)由(you)于發(fa)射功(gong)(gong)率(lv)小(xiao)，分(fen)(fen)(fen)頻(pin)后的(de)(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)強(qiang)(qiang)度比有線對(dui)(dui)講(jiang)系(xi)統(tong)高很多(在實際使(shi)用(yong)(yong)中(zhong)分(fen)(fen)(fen)頻(pin)設(she)備(bei)一般(ban)可以(yi)(yi)將系(xi)統(tong)信(xin)(xin)號(hao)(hao)分(fen)(fen)(fen)頻(pin)到(dao)50dB以(yi)(yi)上),信(xin)(xin)號(hao)(hao)不(bu)受干(gan)擾。如(ru)果采(cai)用(yong)(yong)分(fen)(fen)(fen)頻(pin)技(ji)術(shu)(shu)，需(xu)要(yao)在較大的(de)(de)(de)(de)(de)回波(bo)功(gong)(gong)率(lv)下才(cai)能(neng)實現信(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)(de)分(fen)(fen)(fen)頻(pin)工(gong)作(zuo)(如(ru)分(fen)(fen)(fen)頻(pin)器發(fa)射信(xin)(xin)號(hao)(hao)與(yu)接(jie)收信(xin)(xin)號(hao)(hao)重疊時(shi)產(chan)生的(de)(de)(de)(de)(de)千擾)和發(fa)送信(xin)(xin)號(hao)(hao)強(qiang)(qiang)度降低(同頻(pin)帶內的(de)(de)(de)(de)(de)兩只天線對(dui)(dui)同一信(xin)(xin)道傳輸的(de)(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)強(qiang)(qiang)度基本一致(zhi));如(ru)果采(cai)用(yong)(yong)混響技(ji)術(shu)(shu)，則可以(yi)(yi)實現對(dui)(dui)無(wu)(wu)(wu)線信(xin)(xin)號(hao)(hao)干(gan)擾的(de)(de)(de)(de)(de)抑(yi)制或(huo)降低。