由于在(zai)(zai)戶(hu)(hu)(hu)外(wai)、室內等區域，無線(xian)(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)的(de)(de)信(xin)號強(qiang)度較(jiao)弱(ruo)，而且采(cai)用(yong)(yong)(yong)頻(pin)率調制技術（如(ru)(ru) MHZ、 NMR、 BSI等）產生的(de)(de)信(xin)號傳(chuan)輸時(shi)(shi)(shi)延大，傳(chuan)輸距(ju)離遠(yuan)。因(yin)此有(you)線(xian)(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)不(bu)適合在(zai)(zai)戶(hu)(hu)(hu)外(wai)環境使(shi)(shi)用(yong)(yong)(yong)，特(te)別是在(zai)(zai)冬天及低風(feng)速(su)季節使(shi)(shi)用(yong)(yong)(yong)。雖(sui)然(ran)無線(xian)(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)也有(you)著不(bu)錯的(de)(de)效(xiao)果。但由于系(xi)(xi)統(tong)工作時(shi)(shi)(shi)會有(you)一(yi)定的(de)(de)干擾，使(shi)(shi)對(dui)講(jiang)(jiang)效(xiao)果下降，另外(wai)在(zai)(zai)信(xin)號較(jiao)弱(ruo)時(shi)(shi)(shi)對(dui)用(yong)(yong)(yong)戶(hu)(hu)(hu)語(yu)音產生了影響(xiang)。特(te)別是在(zai)(zai)人員復雜、通(tong)信(xin)距(ju)離較(jiao)短或需(xu)(xu)要較(jiao)長(chang)時(shi)(shi)(shi)間(jian)使(shi)(shi)用(yong)(yong)(yong)時(shi)(shi)(shi)。因(yin)此，更(geng)需(xu)(xu)要有(you)一(yi)個(ge)可(ke)(ke)靠的(de)(de)無線(xian)(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)提(ti)供與有(you)線(xian)(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)一(yi)樣的(de)(de)語(yu)音信(xin)息(xi)與控制。無線(xian)(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)具有(you)很高(gao)的(de)(de)靈活(huo)性，它(ta)能夠(gou)滿(man)足現場中(zhong)所有(you)環境使(shi)(shi)用(yong)(yong)(yong)需(xu)(xu)求(qiu)并(bing)能隨(sui)(sui)(sui)時(shi)(shi)(shi)切換（如(ru)(ru)在(zai)(zai)野(ye)外(wai)、戶(hu)(hu)(hu)外(wai)電話等),用(yong)(yong)(yong)戶(hu)(hu)(hu)可(ke)(ke)以在(zai)(zai)任何(he)地點(dian)使(shi)(shi)用(yong)(yong)(yong)、隨(sui)(sui)(sui)時(shi)(shi)(shi)、隨(sui)(sui)(sui)地進行通(tong)訊。使(shi)(shi)用(yong)(yong)(yong)方便、節省成本(ben)、節約費用(yong)(yong)(yong)。下面我(wo)們來了解一(yi)下無線(xian)(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)它(ta)主要是什么優(you)點(dian)？

1.性能穩定，可靠性高

在相同無(wu)(wu)(wu)線(xian)(xian)(xian)傳(chuan)輸距離下，無(wu)(wu)(wu)線(xian)(xian)(xian)傳(chuan)輸信(xin)號(hao)(hao)(hao)更穩(wen)定(ding)由于(yu)使(shi)用(yong)了功率放(fang)大器(qi)來對(dui)無(wu)(wu)(wu)線(xian)(xian)(xian)信(xin)號(hao)(hao)(hao)進行(xing)壓縮和(he)放(fang)大，使(shi)無(wu)(wu)(wu)線(xian)(xian)(xian)信(xin)號(hao)(hao)(hao)更加穩(wen)定(ding)可靠。無(wu)(wu)(wu)線(xian)(xian)(xian)信(xin)號(hao)(hao)(hao)在弱電磁(ci)環境(jing)下也能(neng)(neng)保(bao)(bao)持(chi)較好(hao)(hao)(hao)的(de)(de)性(xing)能(neng)(neng)。無(wu)(wu)(wu)線(xian)(xian)(xian)對(dui)講系(xi)(xi)統(tong)(tong)(tong)具有(you)發(fa)(fa)射(she)(she)(she)功率小(xiao)、抗(kang)(kang)(kang)千(qian)擾(rao)(rao)能(neng)(neng)力強(與(yu)有(you)線(xian)(xian)(xian)對(dui)講系(xi)(xi)統(tong)(tong)(tong)比較)和(he)抗(kang)(kang)(kang)電磁(ci)干擾(rao)(rao)能(neng)(neng)力強(與(yu)有(you)線(xian)(xian)(xian)對(dui)講系(xi)(xi)統(tong)(tong)(tong)比較)的(de)(de)特點。無(wu)(wu)(wu)線(xian)(xian)(xian)對(dui)講系(xi)(xi)統(tong)(tong)(tong)發(fa)(fa)射(she)(she)(she)信(xin)號(hao)(hao)(hao)在發(fa)(fa)射(she)(she)(she)前和(he)發(fa)(fa)射(she)(she)(she)后均(jun)能(neng)(neng)保(bao)(bao)持(chi)良(liang)好(hao)(hao)(hao)的(de)(de)性(xing)能(neng)(neng)，使(shi)用(yong)過程中，發(fa)(fa)射(she)(she)(she)信(xin)號(hao)(hao)(hao)與(yu)接收信(xin)號(hao)(hao)(hao)完全不受任(ren)何千(qian)擾(rao)(rao)，可保(bao)(bao)持(chi)很好(hao)(hao)(hao)的(de)(de)穩(wen)定(ding)性(xing)，具有(you)良(liang)好(hao)(hao)(hao)的(de)(de)抗(kang)(kang)(kang)千(qian)擾(rao)(rao)性(xing)和(he)抗(kang)(kang)(kang)低(di)頻干擾(rao)(rao)能(neng)(neng)力，即使(shi)在惡(e)劣的(de)(de)環境(jing)下也能(neng)(neng)保(bao)(bao)持(chi)較好(hao)(hao)(hao)的(de)(de)性(xing)能(neng)(neng)。因(yin)此無(wu)(wu)(wu)線(xian)(xian)(xian)系(xi)(xi)統(tong)(tong)(tong)有(you)較高的(de)(de)可靠性(xing)。

2.功耗小、不受天氣、濕(shi)度的影響(xiang)

無(wu)線對(dui)講(jiang)系(xi)統(tong)在(zai)不(bu)(bu)(bu)同(tong)(tong)的(de)(de)環境(jing)中，無(wu)線通信(xin)設(she)備和有(you)線通信(xin)設(she)備一(yi)樣都要進行電(dian)能的(de)(de)消耗(hao)。當環境(jing)溫(wen)度在(zai)-40°C以下(xia)時(shi)，無(wu)線通信(xin)設(she)備需要每天(tian)工作(zuo)(zuo)(zuo)8小(xiao)時(shi)左右(you);當環境(jing)溫(wen)度為-20°C時(shi)，每天(tian)工作(zuo)(zuo)(zuo)8小(xiao)時(shi)左右(you);當環境(jing)溫(wen)度為-30°C時(shi)，每天(tian)工作(zuo)(zuo)(zuo)4小(xiao)時(shi)左右(you)。目前市場上(shang)常見(jian)的(de)(de)無(wu)線對(dui)講(jiang)系(xi)統(tong)有(you)兩種電(dian)源輸入方式(shi)，一(yi)種是(shi)電(dian)源輸入，另(ling)一(yi)種是(shi)電(dian)源輸出。從這兩種方式(shi)對(dui)系(xi)統(tong)的(de)(de)功耗(hao)來看，電(dian)源輸入方式(shi)的(de)(de)功耗(hao)更大(da)一(yi)些，但(dan)是(shi)功耗(hao)很小(xiao)。并且設(she)備的(de)(de)工作(zuo)(zuo)(zuo)環境(jing)不(bu)(bu)(bu)同(tong)(tong)，對(dui)電(dian)池的(de)(de)需求量也不(bu)(bu)(bu)同(tong)(tong)，所以功耗(hao)也不(bu)(bu)(bu)同(tong)(tong)。

3信號不受干擾

在(zai)一(yi)(yi)(yi)些(xie)有干(gan)擾(rao)(rao)的(de)(de)(de)(de)地方，例如野(ye)外(wai)、機場、工(gong)廠等，一(yi)(yi)(yi)般采(cai)用(yong)分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)方式。分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)方式的(de)(de)(de)(de)抗(kang)干(gan)擾(rao)(rao)能(neng)力(li)不(bu)強(qiang)，其抗(kang)干(gan)擾(rao)(rao)能(neng)力(li)主(zhu)要(yao)(yao)取(qu)決于(yu)射頻(pin)(pin)(pin)(pin)功(gong)率的(de)(de)(de)(de)大小。分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)(ji)術(shu)(shu)的(de)(de)(de)(de)功(gong)率一(yi)(yi)(yi)般是(shi)(shi)50dB在(zai)50dB左右時(shi)，其抗(kang)干(gan)擾(rao)(rao)能(neng)力(li)強(qiang)。但由于(yu)分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)的(de)(de)(de)(de)干(gan)擾(rao)(rao)與(yu)噪聲(主(zhu)要(yao)(yao)是(shi)(shi)周邊噪聲)具有很強(qiang)的(de)(de)(de)(de)互(hu)通性，當分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)發射的(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)超過50dB時(shi)，其抗(kang)千(qian)(qian)擾(rao)(rao)能(neng)力(li)就會(hui)減弱。另外(wai)，在(zai)一(yi)(yi)(yi)些(xie)有噪音(yin)的(de)(de)(de)(de)環境中(zhong)使(shi)用(yong)分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)(ji)術(shu)(shu)，會(hui)使(shi)分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)信(xin)(xin)號(hao)(hao)(hao)無(wu)法到達發射端的(de)(de)(de)(de)接收機或者造成發射端信(xin)(xin)號(hao)(hao)(hao)與(yu)接收端信(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)糟(zao)合而造成分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)或干(gan)擾(rao)(rao)(例如在(zai)使(shi)用(yong)室外(wai)電話時(shi)) 。而采(cai)用(yong)分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)(ji)術(shu)(shu)的(de)(de)(de)(de)無(wu)線(xian)對(dui)講(jiang)系(xi)統由于(yu)發射功(gong)率小，分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)后的(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)強(qiang)度(du)比有線(xian)對(dui)講(jiang)系(xi)統高很多(在(zai)實際使(shi)用(yong)中(zhong)分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)設備一(yi)(yi)(yi)般可以將系(xi)統信(xin)(xin)號(hao)(hao)(hao)分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)到50dB以上),信(xin)(xin)號(hao)(hao)(hao)不(bu)受干(gan)擾(rao)(rao)。如果采(cai)用(yong)分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)(ji)術(shu)(shu)，需要(yao)(yao)在(zai)較大的(de)(de)(de)(de)回波功(gong)率下才能(neng)實現(xian)信(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)工(gong)作(如分(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)器發射信(xin)(xin)號(hao)(hao)(hao)與(yu)接收信(xin)(xin)號(hao)(hao)(hao)重疊時(shi)產生的(de)(de)(de)(de)千(qian)(qian)擾(rao)(rao))和(he)發送(song)信(xin)(xin)號(hao)(hao)(hao)強(qiang)度(du)降低(di)(同頻(pin)(pin)(pin)(pin)帶內(nei)的(de)(de)(de)(de)兩只天線(xian)對(dui)同一(yi)(yi)(yi)信(xin)(xin)道傳輸的(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)強(qiang)度(du)基本一(yi)(yi)(yi)致);如果采(cai)用(yong)混響(xiang)技(ji)(ji)術(shu)(shu)，則(ze)可以實現(xian)對(dui)無(wu)線(xian)信(xin)(xin)號(hao)(hao)(hao)干(gan)擾(rao)(rao)的(de)(de)(de)(de)抑制或降低(di)。