由于在戶(hu)(hu)外(wai)、室內等(deng)區域，無線(xian)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)(jiang)系統(tong)的信(xin)號(hao)(hao)強(qiang)度較(jiao)(jiao)弱，而且(qie)采用(yong)(yong)(yong)頻率調(diao)制技術（如(ru) MHZ、 NMR、 BSI等(deng)）產生的信(xin)號(hao)(hao)傳(chuan)輸(shu)時(shi)(shi)延大(da)，傳(chuan)輸(shu)距離遠。因此(ci)有(you)(you)線(xian)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)(jiang)系統(tong)不(bu)適合在戶(hu)(hu)外(wai)環境(jing)使(shi)(shi)用(yong)(yong)(yong)，特別是(shi)在冬天及低(di)風速季節使(shi)(shi)用(yong)(yong)(yong)。雖然無線(xian)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)(jiang)系統(tong)也有(you)(you)著不(bu)錯的效果(guo)。但由于系統(tong)工作時(shi)(shi)會有(you)(you)一(yi)定(ding)的干(gan)擾，使(shi)(shi)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)(jiang)效果(guo)下(xia)(xia)降，另外(wai)在信(xin)號(hao)(hao)較(jiao)(jiao)弱時(shi)(shi)對(dui)(dui)(dui)用(yong)(yong)(yong)戶(hu)(hu)語(yu)音(yin)產生了影響。特別是(shi)在人員復(fu)雜、通(tong)信(xin)距離較(jiao)(jiao)短或需(xu)要(yao)(yao)較(jiao)(jiao)長時(shi)(shi)間使(shi)(shi)用(yong)(yong)(yong)時(shi)(shi)。因此(ci)，更需(xu)要(yao)(yao)有(you)(you)一(yi)個可(ke)靠的無線(xian)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)(jiang)系統(tong)提供與(yu)有(you)(you)線(xian)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)(jiang)系統(tong)一(yi)樣的語(yu)音(yin)信(xin)息與(yu)控制。無線(xian)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)(jiang)系統(tong)具有(you)(you)很高的靈活性，它能夠滿足現場中所有(you)(you)環境(jing)使(shi)(shi)用(yong)(yong)(yong)需(xu)求并能隨時(shi)(shi)切換(huan)（如(ru)在野外(wai)、戶(hu)(hu)外(wai)電話(hua)等(deng)),用(yong)(yong)(yong)戶(hu)(hu)可(ke)以在任何地點使(shi)(shi)用(yong)(yong)(yong)、隨時(shi)(shi)、隨地進行通(tong)訊。使(shi)(shi)用(yong)(yong)(yong)方(fang)便、節省成(cheng)本、節約(yue)費用(yong)(yong)(yong)。下(xia)(xia)面(mian)我們來了解(jie)一(yi)下(xia)(xia)無線(xian)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)(jiang)系統(tong)它主要(yao)(yao)是(shi)什么(me)優點？

1.性能(neng)穩(wen)定，可(ke)靠(kao)性高

在(zai)相同(tong)無(wu)(wu)(wu)線(xian)(xian)傳輸距離下(xia)，無(wu)(wu)(wu)線(xian)(xian)傳輸信(xin)號(hao)更穩定由于(yu)使(shi)用(yong)了(le)功率放(fang)大器(qi)來對(dui)(dui)無(wu)(wu)(wu)線(xian)(xian)信(xin)號(hao)進行壓縮和放(fang)大，使(shi)無(wu)(wu)(wu)線(xian)(xian)信(xin)號(hao)更加(jia)穩定可靠。無(wu)(wu)(wu)線(xian)(xian)信(xin)號(hao)在(zai)弱電(dian)磁(ci)環境下(xia)也能(neng)(neng)保(bao)(bao)持較好的(de)(de)性(xing)(xing)能(neng)(neng)。無(wu)(wu)(wu)線(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統具有(you)發(fa)(fa)(fa)射(she)(she)功率小、抗(kang)千(qian)擾能(neng)(neng)力強(與有(you)線(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統比較)和抗(kang)電(dian)磁(ci)干擾能(neng)(neng)力強(與有(you)線(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統比較)的(de)(de)特點(dian)。無(wu)(wu)(wu)線(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統發(fa)(fa)(fa)射(she)(she)信(xin)號(hao)在(zai)發(fa)(fa)(fa)射(she)(she)前和發(fa)(fa)(fa)射(she)(she)后均能(neng)(neng)保(bao)(bao)持良(liang)好的(de)(de)性(xing)(xing)能(neng)(neng)，使(shi)用(yong)過程中，發(fa)(fa)(fa)射(she)(she)信(xin)號(hao)與接(jie)收(shou)信(xin)號(hao)完全(quan)不受任何千(qian)擾，可保(bao)(bao)持很好的(de)(de)穩定性(xing)(xing)，具有(you)良(liang)好的(de)(de)抗(kang)千(qian)擾性(xing)(xing)和抗(kang)低頻干擾能(neng)(neng)力，即使(shi)在(zai)惡劣(lie)的(de)(de)環境下(xia)也能(neng)(neng)保(bao)(bao)持較好的(de)(de)性(xing)(xing)能(neng)(neng)。因此無(wu)(wu)(wu)線(xian)(xian)系(xi)統有(you)較高的(de)(de)可靠性(xing)(xing)。

2.功耗小、不受天氣(qi)、濕度(du)的影響

無(wu)線(xian)對(dui)講系(xi)統(tong)在不(bu)同的環(huan)境(jing)(jing)中，無(wu)線(xian)通(tong)信設(she)備(bei)和(he)有(you)線(xian)通(tong)信設(she)備(bei)一樣都要(yao)進行電(dian)能的消耗。當(dang)(dang)環(huan)境(jing)(jing)溫(wen)度在-40°C以(yi)下時，無(wu)線(xian)通(tong)信設(she)備(bei)需(xu)要(yao)每(mei)天(tian)(tian)工(gong)作(zuo)8小時左右;當(dang)(dang)環(huan)境(jing)(jing)溫(wen)度為-20°C時，每(mei)天(tian)(tian)工(gong)作(zuo)8小時左右;當(dang)(dang)環(huan)境(jing)(jing)溫(wen)度為-30°C時，每(mei)天(tian)(tian)工(gong)作(zuo)4小時左右。目前(qian)市場上常見的無(wu)線(xian)對(dui)講系(xi)統(tong)有(you)兩(liang)種電(dian)源(yuan)(yuan)(yuan)輸入(ru)方式(shi)，一種是電(dian)源(yuan)(yuan)(yuan)輸入(ru)，另(ling)一種是電(dian)源(yuan)(yuan)(yuan)輸出(chu)。從這兩(liang)種方式(shi)對(dui)系(xi)統(tong)的功耗來看，電(dian)源(yuan)(yuan)(yuan)輸入(ru)方式(shi)的功耗更大一些，但是功耗很小。并且設(she)備(bei)的工(gong)作(zuo)環(huan)境(jing)(jing)不(bu)同，對(dui)電(dian)池(chi)的需(xu)求量也(ye)(ye)不(bu)同，所以(yi)功耗也(ye)(ye)不(bu)同。

3信號不受干擾

在(zai)(zai)(zai)一(yi)(yi)(yi)(yi)些有干(gan)(gan)(gan)(gan)擾(rao)(rao)(rao)的(de)(de)(de)(de)(de)地(di)方(fang)，例如野(ye)外(wai)、機(ji)場、工(gong)廠等，一(yi)(yi)(yi)(yi)般(ban)采(cai)(cai)用(yong)(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)方(fang)式(shi)。分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)方(fang)式(shi)的(de)(de)(de)(de)(de)抗(kang)干(gan)(gan)(gan)(gan)擾(rao)(rao)(rao)能(neng)力不強(qiang)(qiang)，其抗(kang)干(gan)(gan)(gan)(gan)擾(rao)(rao)(rao)能(neng)力主要(yao)(yao)取決于(yu)射(she)頻(pin)(pin)(pin)功率(lv)(lv)的(de)(de)(de)(de)(de)大小。分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)技(ji)術的(de)(de)(de)(de)(de)功率(lv)(lv)一(yi)(yi)(yi)(yi)般(ban)是50dB在(zai)(zai)(zai)50dB左(zuo)右(you)時，其抗(kang)干(gan)(gan)(gan)(gan)擾(rao)(rao)(rao)能(neng)力強(qiang)(qiang)。但由于(yu)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)的(de)(de)(de)(de)(de)干(gan)(gan)(gan)(gan)擾(rao)(rao)(rao)與(yu)(yu)噪(zao)聲(sheng)(主要(yao)(yao)是周(zhou)邊噪(zao)聲(sheng))具(ju)有很(hen)強(qiang)(qiang)的(de)(de)(de)(de)(de)互通性，當分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)發射(she)的(de)(de)(de)(de)(de)信(xin)號(hao)超(chao)過50dB時，其抗(kang)千擾(rao)(rao)(rao)能(neng)力就會減弱。另(ling)外(wai)，在(zai)(zai)(zai)一(yi)(yi)(yi)(yi)些有噪(zao)音的(de)(de)(de)(de)(de)環境中使(shi)用(yong)(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)技(ji)術，會使(shi)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)信(xin)號(hao)無(wu)(wu)(wu)法到達發射(she)端(duan)的(de)(de)(de)(de)(de)接收(shou)機(ji)或者(zhe)造成發射(she)端(duan)信(xin)號(hao)與(yu)(yu)接收(shou)端(duan)信(xin)號(hao)的(de)(de)(de)(de)(de)糟合而(er)造成分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)或干(gan)(gan)(gan)(gan)擾(rao)(rao)(rao)(例如在(zai)(zai)(zai)使(shi)用(yong)(yong)(yong)室外(wai)電話時) 。而(er)采(cai)(cai)用(yong)(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)技(ji)術的(de)(de)(de)(de)(de)無(wu)(wu)(wu)線(xian)對講(jiang)系統(tong)(tong)(tong)由于(yu)發射(she)功率(lv)(lv)小，分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)后的(de)(de)(de)(de)(de)信(xin)號(hao)強(qiang)(qiang)度(du)比有線(xian)對講(jiang)系統(tong)(tong)(tong)高很(hen)多(duo)(在(zai)(zai)(zai)實(shi)際使(shi)用(yong)(yong)(yong)中分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)設(she)備一(yi)(yi)(yi)(yi)般(ban)可以(yi)將(jiang)系統(tong)(tong)(tong)信(xin)號(hao)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)到50dB以(yi)上),信(xin)號(hao)不受干(gan)(gan)(gan)(gan)擾(rao)(rao)(rao)。如果采(cai)(cai)用(yong)(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)技(ji)術，需要(yao)(yao)在(zai)(zai)(zai)較大的(de)(de)(de)(de)(de)回波功率(lv)(lv)下才能(neng)實(shi)現(xian)信(xin)號(hao)的(de)(de)(de)(de)(de)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)工(gong)作(如分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)器發射(she)信(xin)號(hao)與(yu)(yu)接收(shou)信(xin)號(hao)重疊時產生的(de)(de)(de)(de)(de)千擾(rao)(rao)(rao))和發送信(xin)號(hao)強(qiang)(qiang)度(du)降(jiang)低(同頻(pin)(pin)(pin)帶內的(de)(de)(de)(de)(de)兩(liang)只天線(xian)對同一(yi)(yi)(yi)(yi)信(xin)道傳輸(shu)的(de)(de)(de)(de)(de)信(xin)號(hao)強(qiang)(qiang)度(du)基(ji)本一(yi)(yi)(yi)(yi)致(zhi));如果采(cai)(cai)用(yong)(yong)(yong)混響技(ji)術，則(ze)可以(yi)實(shi)現(xian)對無(wu)(wu)(wu)線(xian)信(xin)號(hao)干(gan)(gan)(gan)(gan)擾(rao)(rao)(rao)的(de)(de)(de)(de)(de)抑(yi)制或降(jiang)低。