由(you)于在戶(hu)(hu)外(wai)、室內等(deng)區(qu)域，無線對(dui)講系(xi)統(tong)(tong)的信號(hao)強度較弱(ruo)，而且采用(yong)(yong)(yong)(yong)頻率(lv)調制技(ji)術(shu)（如 MHZ、 NMR、 BSI等(deng)）產(chan)生的信號(hao)傳輸時(shi)(shi)(shi)延大，傳輸距離遠。因此有(you)線對(dui)講系(xi)統(tong)(tong)不適(shi)合(he)在戶(hu)(hu)外(wai)環(huan)境使(shi)(shi)用(yong)(yong)(yong)(yong)，特別是(shi)在冬天(tian)及低(di)風(feng)速季節(jie)(jie)使(shi)(shi)用(yong)(yong)(yong)(yong)。雖然無線對(dui)講系(xi)統(tong)(tong)也(ye)有(you)著不錯的效果。但由(you)于系(xi)統(tong)(tong)工(gong)作時(shi)(shi)(shi)會有(you)一定的干擾(rao)，使(shi)(shi)對(dui)講效果下降，另外(wai)在信號(hao)較弱(ruo)時(shi)(shi)(shi)對(dui)用(yong)(yong)(yong)(yong)戶(hu)(hu)語音(yin)產(chan)生了影(ying)響。特別是(shi)在人員(yuan)復(fu)雜、通(tong)信距離較短或需要(yao)較長時(shi)(shi)(shi)間使(shi)(shi)用(yong)(yong)(yong)(yong)時(shi)(shi)(shi)。因此，更需要(yao)有(you)一個可靠的無線對(dui)講系(xi)統(tong)(tong)提供與有(you)線對(dui)講系(xi)統(tong)(tong)一樣的語音(yin)信息與控制。無線對(dui)講系(xi)統(tong)(tong)具有(you)很高的靈(ling)活性，它(ta)(ta)能夠滿足現場中所有(you)環(huan)境使(shi)(shi)用(yong)(yong)(yong)(yong)需求并能隨時(shi)(shi)(shi)切換（如在野外(wai)、戶(hu)(hu)外(wai)電話(hua)等(deng)),用(yong)(yong)(yong)(yong)戶(hu)(hu)可以在任何地點使(shi)(shi)用(yong)(yong)(yong)(yong)、隨時(shi)(shi)(shi)、隨地進行通(tong)訊。使(shi)(shi)用(yong)(yong)(yong)(yong)方(fang)便、節(jie)(jie)省成(cheng)本、節(jie)(jie)約費用(yong)(yong)(yong)(yong)。下面我們來了解(jie)一下無線對(dui)講系(xi)統(tong)(tong)它(ta)(ta)主要(yao)是(shi)什(shen)么優點？

1.性(xing)能穩(wen)定，可(ke)靠(kao)性(xing)高(gao)

在相(xiang)同無線(xian)(xian)(xian)傳輸距離下(xia)(xia)，無線(xian)(xian)(xian)傳輸信(xin)(xin)號(hao)更穩定(ding)由(you)于使(shi)用了功率(lv)放大器來對(dui)無線(xian)(xian)(xian)信(xin)(xin)號(hao)進行壓縮(suo)和放大，使(shi)無線(xian)(xian)(xian)信(xin)(xin)號(hao)更加穩定(ding)可(ke)(ke)(ke)靠。無線(xian)(xian)(xian)信(xin)(xin)號(hao)在弱電磁(ci)環境下(xia)(xia)也(ye)能(neng)(neng)(neng)保(bao)(bao)持較(jiao)(jiao)好(hao)的(de)(de)(de)(de)性(xing)能(neng)(neng)(neng)。無線(xian)(xian)(xian)對(dui)講系統(tong)具有發(fa)射(she)(she)功率(lv)小、抗(kang)(kang)千擾(rao)(rao)(rao)(rao)能(neng)(neng)(neng)力強(qiang)(與有線(xian)(xian)(xian)對(dui)講系統(tong)比(bi)較(jiao)(jiao))和抗(kang)(kang)電磁(ci)干擾(rao)(rao)(rao)(rao)能(neng)(neng)(neng)力強(qiang)(與有線(xian)(xian)(xian)對(dui)講系統(tong)比(bi)較(jiao)(jiao))的(de)(de)(de)(de)特點。無線(xian)(xian)(xian)對(dui)講系統(tong)發(fa)射(she)(she)信(xin)(xin)號(hao)在發(fa)射(she)(she)前和發(fa)射(she)(she)后均能(neng)(neng)(neng)保(bao)(bao)持良好(hao)的(de)(de)(de)(de)性(xing)能(neng)(neng)(neng)，使(shi)用過程中，發(fa)射(she)(she)信(xin)(xin)號(hao)與接收信(xin)(xin)號(hao)完全不(bu)受(shou)任(ren)何(he)千擾(rao)(rao)(rao)(rao)，可(ke)(ke)(ke)保(bao)(bao)持很好(hao)的(de)(de)(de)(de)穩定(ding)性(xing)，具有良好(hao)的(de)(de)(de)(de)抗(kang)(kang)千擾(rao)(rao)(rao)(rao)性(xing)和抗(kang)(kang)低頻(pin)干擾(rao)(rao)(rao)(rao)能(neng)(neng)(neng)力，即使(shi)在惡劣(lie)的(de)(de)(de)(de)環境下(xia)(xia)也(ye)能(neng)(neng)(neng)保(bao)(bao)持較(jiao)(jiao)好(hao)的(de)(de)(de)(de)性(xing)能(neng)(neng)(neng)。因此無線(xian)(xian)(xian)系統(tong)有較(jiao)(jiao)高的(de)(de)(de)(de)可(ke)(ke)(ke)靠性(xing)。

2.功(gong)耗小、不(bu)受天氣(qi)、濕(shi)度的影響

無線(xian)對講(jiang)系統(tong)(tong)在不(bu)(bu)同的環(huan)境(jing)中，無線(xian)通(tong)(tong)信設備(bei)(bei)和有線(xian)通(tong)(tong)信設備(bei)(bei)一樣(yang)都要進行電(dian)(dian)(dian)(dian)能的消耗(hao)(hao)。當(dang)環(huan)境(jing)溫(wen)度在-40°C以下時(shi)(shi)(shi)，無線(xian)通(tong)(tong)信設備(bei)(bei)需(xu)(xu)要每(mei)(mei)天工(gong)作8小(xiao)時(shi)(shi)(shi)左(zuo)右(you);當(dang)環(huan)境(jing)溫(wen)度為-20°C時(shi)(shi)(shi)，每(mei)(mei)天工(gong)作8小(xiao)時(shi)(shi)(shi)左(zuo)右(you);當(dang)環(huan)境(jing)溫(wen)度為-30°C時(shi)(shi)(shi)，每(mei)(mei)天工(gong)作4小(xiao)時(shi)(shi)(shi)左(zuo)右(you)。目前市場上(shang)常見的無線(xian)對講(jiang)系統(tong)(tong)有兩(liang)種電(dian)(dian)(dian)(dian)源輸(shu)入(ru)方(fang)(fang)式(shi)，一種是(shi)電(dian)(dian)(dian)(dian)源輸(shu)入(ru)，另一種是(shi)電(dian)(dian)(dian)(dian)源輸(shu)出。從這(zhe)兩(liang)種方(fang)(fang)式(shi)對系統(tong)(tong)的功(gong)耗(hao)(hao)來看，電(dian)(dian)(dian)(dian)源輸(shu)入(ru)方(fang)(fang)式(shi)的功(gong)耗(hao)(hao)更大一些，但是(shi)功(gong)耗(hao)(hao)很小(xiao)。并且設備(bei)(bei)的工(gong)作環(huan)境(jing)不(bu)(bu)同，對電(dian)(dian)(dian)(dian)池的需(xu)(xu)求量也不(bu)(bu)同，所(suo)以功(gong)耗(hao)(hao)也不(bu)(bu)同。

3信號不受干擾

在(zai)一(yi)些有干(gan)擾(rao)的(de)(de)(de)地(di)方，例如(ru)(ru)野外(wai)、機(ji)(ji)場(chang)、工(gong)(gong)廠(chang)等，一(yi)般(ban)采(cai)用分(fen)(fen)頻(pin)(pin)(pin)方式。分(fen)(fen)頻(pin)(pin)(pin)方式的(de)(de)(de)抗(kang)干(gan)擾(rao)能(neng)(neng)力不(bu)(bu)強(qiang)(qiang)(qiang)，其抗(kang)干(gan)擾(rao)能(neng)(neng)力主(zhu)要取決于(yu)射頻(pin)(pin)(pin)功(gong)(gong)率(lv)(lv)的(de)(de)(de)大(da)小(xiao)(xiao)。分(fen)(fen)頻(pin)(pin)(pin)技(ji)(ji)術的(de)(de)(de)功(gong)(gong)率(lv)(lv)一(yi)般(ban)是50dB在(zai)50dB左右(you)時，其抗(kang)干(gan)擾(rao)能(neng)(neng)力強(qiang)(qiang)(qiang)。但由于(yu)分(fen)(fen)頻(pin)(pin)(pin)的(de)(de)(de)干(gan)擾(rao)與噪聲(主(zhu)要是周邊噪聲)具(ju)有很強(qiang)(qiang)(qiang)的(de)(de)(de)互通性，當分(fen)(fen)頻(pin)(pin)(pin)發(fa)(fa)射的(de)(de)(de)信(xin)號(hao)(hao)(hao)(hao)(hao)(hao)超過(guo)50dB時，其抗(kang)千(qian)擾(rao)能(neng)(neng)力就(jiu)會減弱。另外(wai)，在(zai)一(yi)些有噪音的(de)(de)(de)環境中(zhong)使(shi)(shi)用分(fen)(fen)頻(pin)(pin)(pin)技(ji)(ji)術，會使(shi)(shi)分(fen)(fen)頻(pin)(pin)(pin)信(xin)號(hao)(hao)(hao)(hao)(hao)(hao)無(wu)(wu)法(fa)到達發(fa)(fa)射端(duan)的(de)(de)(de)接(jie)(jie)收(shou)(shou)機(ji)(ji)或者造成發(fa)(fa)射端(duan)信(xin)號(hao)(hao)(hao)(hao)(hao)(hao)與接(jie)(jie)收(shou)(shou)端(duan)信(xin)號(hao)(hao)(hao)(hao)(hao)(hao)的(de)(de)(de)糟(zao)合而造成分(fen)(fen)頻(pin)(pin)(pin)或干(gan)擾(rao)(例如(ru)(ru)在(zai)使(shi)(shi)用室(shi)外(wai)電話(hua)時) 。而采(cai)用分(fen)(fen)頻(pin)(pin)(pin)技(ji)(ji)術的(de)(de)(de)無(wu)(wu)線(xian)(xian)對講系統由于(yu)發(fa)(fa)射功(gong)(gong)率(lv)(lv)小(xiao)(xiao)，分(fen)(fen)頻(pin)(pin)(pin)后的(de)(de)(de)信(xin)號(hao)(hao)(hao)(hao)(hao)(hao)強(qiang)(qiang)(qiang)度比有線(xian)(xian)對講系統高(gao)很多(在(zai)實際使(shi)(shi)用中(zhong)分(fen)(fen)頻(pin)(pin)(pin)設備一(yi)般(ban)可以將系統信(xin)號(hao)(hao)(hao)(hao)(hao)(hao)分(fen)(fen)頻(pin)(pin)(pin)到50dB以上),信(xin)號(hao)(hao)(hao)(hao)(hao)(hao)不(bu)(bu)受干(gan)擾(rao)。如(ru)(ru)果采(cai)用分(fen)(fen)頻(pin)(pin)(pin)技(ji)(ji)術，需要在(zai)較大(da)的(de)(de)(de)回波功(gong)(gong)率(lv)(lv)下(xia)才(cai)能(neng)(neng)實現(xian)信(xin)號(hao)(hao)(hao)(hao)(hao)(hao)的(de)(de)(de)分(fen)(fen)頻(pin)(pin)(pin)工(gong)(gong)作(zuo)(如(ru)(ru)分(fen)(fen)頻(pin)(pin)(pin)器發(fa)(fa)射信(xin)號(hao)(hao)(hao)(hao)(hao)(hao)與接(jie)(jie)收(shou)(shou)信(xin)號(hao)(hao)(hao)(hao)(hao)(hao)重(zhong)疊時產(chan)生的(de)(de)(de)千(qian)擾(rao))和發(fa)(fa)送(song)信(xin)號(hao)(hao)(hao)(hao)(hao)(hao)強(qiang)(qiang)(qiang)度降低(同頻(pin)(pin)(pin)帶內的(de)(de)(de)兩只天線(xian)(xian)對同一(yi)信(xin)道傳(chuan)輸的(de)(de)(de)信(xin)號(hao)(hao)(hao)(hao)(hao)(hao)強(qiang)(qiang)(qiang)度基(ji)本一(yi)致);如(ru)(ru)果采(cai)用混響(xiang)技(ji)(ji)術，則可以實現(xian)對無(wu)(wu)線(xian)(xian)信(xin)號(hao)(hao)(hao)(hao)(hao)(hao)干(gan)擾(rao)的(de)(de)(de)抑制或降低。