由(you)于(yu)在(zai)戶(hu)外、室(shi)內等(deng)(deng)區域，無(wu)(wu)線(xian)對(dui)(dui)講系統的(de)(de)信號(hao)強(qiang)度較(jiao)(jiao)弱(ruo)(ruo)，而(er)且(qie)采用(yong)(yong)頻率調制(zhi)技術（如 MHZ、 NMR、 BSI等(deng)(deng)）產生的(de)(de)信號(hao)傳輸(shu)時(shi)延(yan)大，傳輸(shu)距(ju)離(li)(li)遠。因此(ci)有(you)(you)線(xian)對(dui)(dui)講系統不(bu)適合(he)在(zai)戶(hu)外環(huan)境使(shi)(shi)用(yong)(yong)，特(te)(te)別是(shi)在(zai)冬天及低(di)風速(su)季節使(shi)(shi)用(yong)(yong)。雖然無(wu)(wu)線(xian)對(dui)(dui)講系統也有(you)(you)著不(bu)錯的(de)(de)效果。但由(you)于(yu)系統工作時(shi)會(hui)有(you)(you)一(yi)定的(de)(de)干擾，使(shi)(shi)對(dui)(dui)講效果下(xia)降(jiang)，另外在(zai)信號(hao)較(jiao)(jiao)弱(ruo)(ruo)時(shi)對(dui)(dui)用(yong)(yong)戶(hu)語音產生了影響(xiang)。特(te)(te)別是(shi)在(zai)人員復雜、通信距(ju)離(li)(li)較(jiao)(jiao)短或需(xu)要較(jiao)(jiao)長(chang)時(shi)間使(shi)(shi)用(yong)(yong)時(shi)。因此(ci)，更需(xu)要有(you)(you)一(yi)個(ge)可(ke)靠的(de)(de)無(wu)(wu)線(xian)對(dui)(dui)講系統提供(gong)與有(you)(you)線(xian)對(dui)(dui)講系統一(yi)樣(yang)的(de)(de)語音信息與控制(zhi)。無(wu)(wu)線(xian)對(dui)(dui)講系統具有(you)(you)很高的(de)(de)靈活性，它能(neng)夠(gou)滿足現場中所有(you)(you)環(huan)境使(shi)(shi)用(yong)(yong)需(xu)求并(bing)能(neng)隨(sui)(sui)時(shi)切換（如在(zai)野(ye)外、戶(hu)外電話等(deng)(deng)),用(yong)(yong)戶(hu)可(ke)以在(zai)任(ren)何地(di)點使(shi)(shi)用(yong)(yong)、隨(sui)(sui)時(shi)、隨(sui)(sui)地(di)進行通訊。使(shi)(shi)用(yong)(yong)方(fang)便、節省成本、節約費用(yong)(yong)。下(xia)面我們來了解一(yi)下(xia)無(wu)(wu)線(xian)對(dui)(dui)講系統它主要是(shi)什么優點？

1.性(xing)能穩定，可靠性(xing)高

在相同無(wu)(wu)線(xian)(xian)傳輸(shu)距離下(xia)，無(wu)(wu)線(xian)(xian)傳輸(shu)信(xin)(xin)號更穩(wen)(wen)(wen)定(ding)由于使用(yong)了功率(lv)放(fang)大器來對(dui)(dui)無(wu)(wu)線(xian)(xian)信(xin)(xin)號進(jin)行(xing)壓縮(suo)和(he)(he)放(fang)大，使無(wu)(wu)線(xian)(xian)信(xin)(xin)號更加穩(wen)(wen)(wen)定(ding)可(ke)靠。無(wu)(wu)線(xian)(xian)信(xin)(xin)號在弱電磁(ci)環(huan)境下(xia)也(ye)能(neng)(neng)保持較(jiao)(jiao)好(hao)的性(xing)能(neng)(neng)。無(wu)(wu)線(xian)(xian)對(dui)(dui)講系統具(ju)有發(fa)射(she)功率(lv)小、抗千(qian)(qian)擾(rao)能(neng)(neng)力(li)強(qiang)(與有線(xian)(xian)對(dui)(dui)講系統比較(jiao)(jiao))和(he)(he)抗電磁(ci)干擾(rao)能(neng)(neng)力(li)強(qiang)(與有線(xian)(xian)對(dui)(dui)講系統比較(jiao)(jiao))的特點。無(wu)(wu)線(xian)(xian)對(dui)(dui)講系統發(fa)射(she)信(xin)(xin)號在發(fa)射(she)前和(he)(he)發(fa)射(she)后均(jun)能(neng)(neng)保持良(liang)好(hao)的性(xing)能(neng)(neng)，使用(yong)過程(cheng)中，發(fa)射(she)信(xin)(xin)號與接收信(xin)(xin)號完全不受(shou)任何千(qian)(qian)擾(rao)，可(ke)保持很好(hao)的穩(wen)(wen)(wen)定(ding)性(xing)，具(ju)有良(liang)好(hao)的抗千(qian)(qian)擾(rao)性(xing)和(he)(he)抗低(di)頻干擾(rao)能(neng)(neng)力(li)，即使在惡劣的環(huan)境下(xia)也(ye)能(neng)(neng)保持較(jiao)(jiao)好(hao)的性(xing)能(neng)(neng)。因此(ci)無(wu)(wu)線(xian)(xian)系統有較(jiao)(jiao)高的可(ke)靠性(xing)。

2.功耗小、不受天氣、濕度的影響(xiang)

無(wu)線(xian)對(dui)講系統(tong)在(zai)不同(tong)(tong)的(de)環(huan)(huan)(huan)境中，無(wu)線(xian)通信(xin)設備和有線(xian)通信(xin)設備一樣(yang)都要(yao)進(jin)行電(dian)(dian)能(neng)的(de)消耗。當環(huan)(huan)(huan)境溫(wen)度在(zai)-40°C以下時，無(wu)線(xian)通信(xin)設備需要(yao)每天(tian)(tian)工作8小(xiao)時左右(you);當環(huan)(huan)(huan)境溫(wen)度為(wei)-20°C時，每天(tian)(tian)工作8小(xiao)時左右(you);當環(huan)(huan)(huan)境溫(wen)度為(wei)-30°C時，每天(tian)(tian)工作4小(xiao)時左右(you)。目前市場上常見的(de)無(wu)線(xian)對(dui)講系統(tong)有兩(liang)種(zhong)電(dian)(dian)源(yuan)輸入方式(shi)，一種(zhong)是電(dian)(dian)源(yuan)輸入，另(ling)一種(zhong)是電(dian)(dian)源(yuan)輸出。從這兩(liang)種(zhong)方式(shi)對(dui)系統(tong)的(de)功耗來看，電(dian)(dian)源(yuan)輸入方式(shi)的(de)功耗更大一些，但是功耗很小(xiao)。并且(qie)設備的(de)工作環(huan)(huan)(huan)境不同(tong)(tong)，對(dui)電(dian)(dian)池的(de)需求量也(ye)不同(tong)(tong)，所以功耗也(ye)不同(tong)(tong)。

3信號不受干擾

在(zai)一些有(you)(you)干(gan)擾(rao)(rao)的(de)(de)(de)(de)(de)地(di)方，例(li)如(ru)(ru)(ru)野外、機場、工(gong)(gong)廠等，一般采(cai)用(yong)(yong)分頻(pin)(pin)方式。分頻(pin)(pin)方式的(de)(de)(de)(de)(de)抗(kang)干(gan)擾(rao)(rao)能(neng)力不(bu)強(qiang)(qiang)(qiang)，其抗(kang)干(gan)擾(rao)(rao)能(neng)力主要取決于射(she)頻(pin)(pin)功率(lv)的(de)(de)(de)(de)(de)大小(xiao)(xiao)。分頻(pin)(pin)技(ji)術(shu)的(de)(de)(de)(de)(de)功率(lv)一般是(shi)50dB在(zai)50dB左(zuo)右時(shi)，其抗(kang)干(gan)擾(rao)(rao)能(neng)力強(qiang)(qiang)(qiang)。但由于分頻(pin)(pin)的(de)(de)(de)(de)(de)干(gan)擾(rao)(rao)與噪聲(sheng)(主要是(shi)周邊噪聲(sheng))具有(you)(you)很強(qiang)(qiang)(qiang)的(de)(de)(de)(de)(de)互(hu)通性，當分頻(pin)(pin)發(fa)射(she)的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)(xin)號(hao)超過50dB時(shi)，其抗(kang)千擾(rao)(rao)能(neng)力就會減弱。另外，在(zai)一些有(you)(you)噪音的(de)(de)(de)(de)(de)環境(jing)中使(shi)用(yong)(yong)分頻(pin)(pin)技(ji)術(shu)，會使(shi)分頻(pin)(pin)信(xin)(xin)(xin)(xin)(xin)號(hao)無法(fa)到(dao)達發(fa)射(she)端(duan)(duan)的(de)(de)(de)(de)(de)接(jie)(jie)(jie)收機或(huo)(huo)(huo)者(zhe)造成發(fa)射(she)端(duan)(duan)信(xin)(xin)(xin)(xin)(xin)號(hao)與接(jie)(jie)(jie)收端(duan)(duan)信(xin)(xin)(xin)(xin)(xin)號(hao)的(de)(de)(de)(de)(de)糟合而造成分頻(pin)(pin)或(huo)(huo)(huo)干(gan)擾(rao)(rao)(例(li)如(ru)(ru)(ru)在(zai)使(shi)用(yong)(yong)室外電(dian)話(hua)時(shi)) 。而采(cai)用(yong)(yong)分頻(pin)(pin)技(ji)術(shu)的(de)(de)(de)(de)(de)無線(xian)對(dui)講(jiang)系(xi)統由于發(fa)射(she)功率(lv)小(xiao)(xiao)，分頻(pin)(pin)后的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)(xin)號(hao)強(qiang)(qiang)(qiang)度(du)(du)比(bi)有(you)(you)線(xian)對(dui)講(jiang)系(xi)統高(gao)很多(duo)(在(zai)實際使(shi)用(yong)(yong)中分頻(pin)(pin)設備一般可(ke)以(yi)將系(xi)統信(xin)(xin)(xin)(xin)(xin)號(hao)分頻(pin)(pin)到(dao)50dB以(yi)上),信(xin)(xin)(xin)(xin)(xin)號(hao)不(bu)受(shou)干(gan)擾(rao)(rao)。如(ru)(ru)(ru)果采(cai)用(yong)(yong)分頻(pin)(pin)技(ji)術(shu)，需要在(zai)較大的(de)(de)(de)(de)(de)回波功率(lv)下才能(neng)實現(xian)信(xin)(xin)(xin)(xin)(xin)號(hao)的(de)(de)(de)(de)(de)分頻(pin)(pin)工(gong)(gong)作(如(ru)(ru)(ru)分頻(pin)(pin)器(qi)發(fa)射(she)信(xin)(xin)(xin)(xin)(xin)號(hao)與接(jie)(jie)(jie)收信(xin)(xin)(xin)(xin)(xin)號(hao)重疊(die)時(shi)產(chan)生的(de)(de)(de)(de)(de)千擾(rao)(rao))和發(fa)送信(xin)(xin)(xin)(xin)(xin)號(hao)強(qiang)(qiang)(qiang)度(du)(du)降低(di)(同頻(pin)(pin)帶內的(de)(de)(de)(de)(de)兩只天線(xian)對(dui)同一信(xin)(xin)(xin)(xin)(xin)道傳輸的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)(xin)號(hao)強(qiang)(qiang)(qiang)度(du)(du)基本一致);如(ru)(ru)(ru)果采(cai)用(yong)(yong)混響技(ji)術(shu)，則(ze)可(ke)以(yi)實現(xian)對(dui)無線(xian)信(xin)(xin)(xin)(xin)(xin)號(hao)干(gan)擾(rao)(rao)的(de)(de)(de)(de)(de)抑制或(huo)(huo)(huo)降低(di)。