由(you)(you)于在戶(hu)(hu)(hu)外(wai)、室內等區域，無(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)的(de)(de)信(xin)號強度較弱，而且采用(yong)(yong)頻率(lv)調制技術（如 MHZ、 NMR、 BSI等）產生的(de)(de)信(xin)號傳(chuan)輸(shu)時(shi)延(yan)大，傳(chuan)輸(shu)距(ju)離遠(yuan)。因(yin)此有(you)線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)不(bu)適合(he)在戶(hu)(hu)(hu)外(wai)環(huan)境使(shi)用(yong)(yong)，特(te)別(bie)是在冬天及低風速季節(jie)(jie)使(shi)用(yong)(yong)。雖然無(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)也有(you)著(zhu)不(bu)錯的(de)(de)效果(guo)。但(dan)由(you)(you)于系(xi)(xi)統(tong)工作時(shi)會有(you)一(yi)(yi)定的(de)(de)干擾，使(shi)對(dui)講(jiang)(jiang)效果(guo)下降，另外(wai)在信(xin)號較弱時(shi)對(dui)用(yong)(yong)戶(hu)(hu)(hu)語(yu)音產生了(le)影(ying)響。特(te)別(bie)是在人員(yuan)復雜、通信(xin)距(ju)離較短(duan)或需(xu)要較長(chang)時(shi)間使(shi)用(yong)(yong)時(shi)。因(yin)此，更需(xu)要有(you)一(yi)(yi)個可靠(kao)的(de)(de)無(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)提供與有(you)線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)一(yi)(yi)樣的(de)(de)語(yu)音信(xin)息(xi)與控制。無(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)具有(you)很高的(de)(de)靈(ling)活(huo)性，它能夠滿足現場(chang)中(zhong)所有(you)環(huan)境使(shi)用(yong)(yong)需(xu)求并能隨時(shi)切換（如在野外(wai)、戶(hu)(hu)(hu)外(wai)電話等),用(yong)(yong)戶(hu)(hu)(hu)可以在任(ren)何地(di)點使(shi)用(yong)(yong)、隨時(shi)、隨地(di)進行通訊。使(shi)用(yong)(yong)方便(bian)、節(jie)(jie)省成本、節(jie)(jie)約費用(yong)(yong)。下面我們來了(le)解一(yi)(yi)下無(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)它主(zhu)要是什么優點？

1.性能穩定，可靠性高

在(zai)相(xiang)同(tong)無(wu)(wu)(wu)線(xian)(xian)傳(chuan)輸(shu)(shu)距離下(xia)，無(wu)(wu)(wu)線(xian)(xian)傳(chuan)輸(shu)(shu)信(xin)(xin)(xin)號(hao)更穩(wen)定(ding)由于使(shi)用了功率(lv)放(fang)(fang)大器來對無(wu)(wu)(wu)線(xian)(xian)信(xin)(xin)(xin)號(hao)進(jin)行(xing)壓縮(suo)和(he)放(fang)(fang)大，使(shi)無(wu)(wu)(wu)線(xian)(xian)信(xin)(xin)(xin)號(hao)更加穩(wen)定(ding)可(ke)靠。無(wu)(wu)(wu)線(xian)(xian)信(xin)(xin)(xin)號(hao)在(zai)弱電磁環(huan)境下(xia)也能保(bao)持(chi)較(jiao)好(hao)的(de)(de)(de)(de)性能。無(wu)(wu)(wu)線(xian)(xian)對講系統具(ju)有(you)發射功率(lv)小(xiao)、抗(kang)千(qian)(qian)擾能力(li)強(與有(you)線(xian)(xian)對講系統比(bi)較(jiao))和(he)抗(kang)電磁干(gan)擾能力(li)強(與有(you)線(xian)(xian)對講系統比(bi)較(jiao))的(de)(de)(de)(de)特(te)點(dian)。無(wu)(wu)(wu)線(xian)(xian)對講系統發射信(xin)(xin)(xin)號(hao)在(zai)發射前和(he)發射后均能保(bao)持(chi)良(liang)好(hao)的(de)(de)(de)(de)性能，使(shi)用過程(cheng)中，發射信(xin)(xin)(xin)號(hao)與接收信(xin)(xin)(xin)號(hao)完全不受任何千(qian)(qian)擾，可(ke)保(bao)持(chi)很好(hao)的(de)(de)(de)(de)穩(wen)定(ding)性，具(ju)有(you)良(liang)好(hao)的(de)(de)(de)(de)抗(kang)千(qian)(qian)擾性和(he)抗(kang)低頻干(gan)擾能力(li)，即使(shi)在(zai)惡(e)劣的(de)(de)(de)(de)環(huan)境下(xia)也能保(bao)持(chi)較(jiao)好(hao)的(de)(de)(de)(de)性能。因此無(wu)(wu)(wu)線(xian)(xian)系統有(you)較(jiao)高的(de)(de)(de)(de)可(ke)靠性。

2.功耗小(xiao)、不受(shou)天氣、濕度的影響(xiang)

無線對(dui)(dui)(dui)講系(xi)(xi)統(tong)在不同的(de)(de)環(huan)境(jing)(jing)中，無線通(tong)信設(she)備和有線通(tong)信設(she)備一樣(yang)都要進行電能(neng)的(de)(de)消(xiao)耗(hao)。當環(huan)境(jing)(jing)溫度(du)(du)在-40°C以下時(shi)，無線通(tong)信設(she)備需(xu)要每天(tian)工(gong)作8小時(shi)左右(you);當環(huan)境(jing)(jing)溫度(du)(du)為-20°C時(shi)，每天(tian)工(gong)作8小時(shi)左右(you);當環(huan)境(jing)(jing)溫度(du)(du)為-30°C時(shi)，每天(tian)工(gong)作4小時(shi)左右(you)。目前市場上常見的(de)(de)無線對(dui)(dui)(dui)講系(xi)(xi)統(tong)有兩(liang)(liang)種(zhong)電源輸(shu)入方式(shi)，一種(zhong)是電源輸(shu)入，另一種(zhong)是電源輸(shu)出。從這兩(liang)(liang)種(zhong)方式(shi)對(dui)(dui)(dui)系(xi)(xi)統(tong)的(de)(de)功耗(hao)來(lai)看，電源輸(shu)入方式(shi)的(de)(de)功耗(hao)更大一些，但是功耗(hao)很小。并(bing)且設(she)備的(de)(de)工(gong)作環(huan)境(jing)(jing)不同，對(dui)(dui)(dui)電池的(de)(de)需(xu)求量也不同，所以功耗(hao)也不同。

3信號不受干擾

在(zai)一(yi)些有干(gan)(gan)(gan)(gan)擾(rao)(rao)(rao)(rao)的(de)(de)(de)(de)(de)地方，例如(ru)野(ye)外、機(ji)場、工廠等，一(yi)般采用(yong)(yong)(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)方式。分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)方式的(de)(de)(de)(de)(de)抗(kang)干(gan)(gan)(gan)(gan)擾(rao)(rao)(rao)(rao)能(neng)(neng)(neng)力(li)不強(qiang)(qiang)，其抗(kang)干(gan)(gan)(gan)(gan)擾(rao)(rao)(rao)(rao)能(neng)(neng)(neng)力(li)主要取決于射(she)頻(pin)(pin)(pin)(pin)(pin)(pin)功(gong)(gong)率(lv)的(de)(de)(de)(de)(de)大(da)小(xiao)。分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)(shu)的(de)(de)(de)(de)(de)功(gong)(gong)率(lv)一(yi)般是(shi)50dB在(zai)50dB左右時(shi)，其抗(kang)干(gan)(gan)(gan)(gan)擾(rao)(rao)(rao)(rao)能(neng)(neng)(neng)力(li)強(qiang)(qiang)。但由于分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)的(de)(de)(de)(de)(de)干(gan)(gan)(gan)(gan)擾(rao)(rao)(rao)(rao)與噪聲(sheng)(主要是(shi)周邊噪聲(sheng))具有很(hen)強(qiang)(qiang)的(de)(de)(de)(de)(de)互通性，當(dang)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)發(fa)射(she)的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)超過(guo)50dB時(shi)，其抗(kang)千擾(rao)(rao)(rao)(rao)能(neng)(neng)(neng)力(li)就會減弱。另外，在(zai)一(yi)些有噪音的(de)(de)(de)(de)(de)環境中使(shi)用(yong)(yong)(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)(shu)，會使(shi)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)無(wu)(wu)法到達(da)發(fa)射(she)端(duan)的(de)(de)(de)(de)(de)接收機(ji)或者造成發(fa)射(she)端(duan)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)與接收端(duan)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)的(de)(de)(de)(de)(de)糟(zao)合而(er)造成分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)或干(gan)(gan)(gan)(gan)擾(rao)(rao)(rao)(rao)(例如(ru)在(zai)使(shi)用(yong)(yong)(yong)(yong)室外電(dian)話(hua)時(shi)) 。而(er)采用(yong)(yong)(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)(shu)的(de)(de)(de)(de)(de)無(wu)(wu)線(xian)對講系(xi)統(tong)由于發(fa)射(she)功(gong)(gong)率(lv)小(xiao)，分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)后的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)強(qiang)(qiang)度(du)比(bi)有線(xian)對講系(xi)統(tong)高很(hen)多(在(zai)實(shi)際使(shi)用(yong)(yong)(yong)(yong)中分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)設(she)備一(yi)般可以將系(xi)統(tong)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)到50dB以上),信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)不受干(gan)(gan)(gan)(gan)擾(rao)(rao)(rao)(rao)。如(ru)果(guo)采用(yong)(yong)(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)(shu)，需要在(zai)較大(da)的(de)(de)(de)(de)(de)回波(bo)功(gong)(gong)率(lv)下才能(neng)(neng)(neng)實(shi)現信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)的(de)(de)(de)(de)(de)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)工作(zuo)(如(ru)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)器(qi)發(fa)射(she)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)與接收信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)重疊(die)時(shi)產(chan)生的(de)(de)(de)(de)(de)千擾(rao)(rao)(rao)(rao))和發(fa)送(song)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)強(qiang)(qiang)度(du)降(jiang)低(di)(同(tong)頻(pin)(pin)(pin)(pin)(pin)(pin)帶內的(de)(de)(de)(de)(de)兩只天線(xian)對同(tong)一(yi)信(xin)(xin)(xin)(xin)道傳輸的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)強(qiang)(qiang)度(du)基本(ben)一(yi)致(zhi));如(ru)果(guo)采用(yong)(yong)(yong)(yong)混響技(ji)術(shu)(shu)，則可以實(shi)現對無(wu)(wu)線(xian)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)干(gan)(gan)(gan)(gan)擾(rao)(rao)(rao)(rao)的(de)(de)(de)(de)(de)抑制(zhi)或降(jiang)低(di)。