由于(yu)在(zai)(zai)戶(hu)(hu)外(wai)(wai)、室(shi)內等區域，無線(xian)對(dui)(dui)(dui)講(jiang)系統(tong)(tong)的信號強度較弱(ruo)，而且(qie)采(cai)用(yong)頻(pin)率調制(zhi)技術（如 MHZ、 NMR、 BSI等）產生(sheng)的信號傳輸時(shi)(shi)延(yan)大，傳輸距(ju)離(li)遠(yuan)。因此(ci)有(you)線(xian)對(dui)(dui)(dui)講(jiang)系統(tong)(tong)不適合在(zai)(zai)戶(hu)(hu)外(wai)(wai)環(huan)境(jing)使用(yong)，特別是(shi)在(zai)(zai)冬天及低(di)風速季節使用(yong)。雖(sui)然無線(xian)對(dui)(dui)(dui)講(jiang)系統(tong)(tong)也有(you)著不錯的效(xiao)果。但由于(yu)系統(tong)(tong)工(gong)作時(shi)(shi)會有(you)一定的干擾，使對(dui)(dui)(dui)講(jiang)效(xiao)果下(xia)降，另外(wai)(wai)在(zai)(zai)信號較弱(ruo)時(shi)(shi)對(dui)(dui)(dui)用(yong)戶(hu)(hu)語(yu)音(yin)產生(sheng)了影響。特別是(shi)在(zai)(zai)人員復雜(za)、通(tong)(tong)信距(ju)離(li)較短或(huo)需要(yao)較長時(shi)(shi)間使用(yong)時(shi)(shi)。因此(ci)，更需要(yao)有(you)一個可靠(kao)的無線(xian)對(dui)(dui)(dui)講(jiang)系統(tong)(tong)提(ti)供與有(you)線(xian)對(dui)(dui)(dui)講(jiang)系統(tong)(tong)一樣的語(yu)音(yin)信息與控制(zhi)。無線(xian)對(dui)(dui)(dui)講(jiang)系統(tong)(tong)具有(you)很高的靈活性，它能夠滿足現場中所有(you)環(huan)境(jing)使用(yong)需求并能隨(sui)時(shi)(shi)切換（如在(zai)(zai)野外(wai)(wai)、戶(hu)(hu)外(wai)(wai)電話等),用(yong)戶(hu)(hu)可以在(zai)(zai)任何(he)地點使用(yong)、隨(sui)時(shi)(shi)、隨(sui)地進行通(tong)(tong)訊。使用(yong)方便、節省成本、節約費用(yong)。下(xia)面我們來(lai)了解一下(xia)無線(xian)對(dui)(dui)(dui)講(jiang)系統(tong)(tong)它主要(yao)是(shi)什么優點？

1.性能穩(wen)定，可靠性高(gao)

在相同(tong)無(wu)(wu)(wu)線(xian)(xian)(xian)傳輸(shu)距離(li)下(xia)，無(wu)(wu)(wu)線(xian)(xian)(xian)傳輸(shu)信(xin)(xin)(xin)號(hao)更(geng)穩定由于使(shi)用了功(gong)率(lv)(lv)放(fang)大器來對(dui)無(wu)(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)(xin)號(hao)進行壓縮和(he)放(fang)大，使(shi)無(wu)(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)(xin)號(hao)更(geng)加穩定可(ke)靠。無(wu)(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)(xin)號(hao)在弱電磁環境(jing)(jing)下(xia)也(ye)能(neng)(neng)保(bao)持較(jiao)(jiao)(jiao)好(hao)的(de)(de)(de)性(xing)(xing)能(neng)(neng)。無(wu)(wu)(wu)線(xian)(xian)(xian)對(dui)講系統(tong)具(ju)有(you)發射功(gong)率(lv)(lv)小、抗(kang)(kang)(kang)千(qian)擾(rao)(rao)能(neng)(neng)力強(與有(you)線(xian)(xian)(xian)對(dui)講系統(tong)比較(jiao)(jiao)(jiao))和(he)抗(kang)(kang)(kang)電磁干(gan)擾(rao)(rao)能(neng)(neng)力強(與有(you)線(xian)(xian)(xian)對(dui)講系統(tong)比較(jiao)(jiao)(jiao))的(de)(de)(de)特點。無(wu)(wu)(wu)線(xian)(xian)(xian)對(dui)講系統(tong)發射信(xin)(xin)(xin)號(hao)在發射前和(he)發射后(hou)均能(neng)(neng)保(bao)持良(liang)(liang)好(hao)的(de)(de)(de)性(xing)(xing)能(neng)(neng)，使(shi)用過程(cheng)中，發射信(xin)(xin)(xin)號(hao)與接收(shou)信(xin)(xin)(xin)號(hao)完全不受任何(he)千(qian)擾(rao)(rao)，可(ke)保(bao)持很好(hao)的(de)(de)(de)穩定性(xing)(xing)，具(ju)有(you)良(liang)(liang)好(hao)的(de)(de)(de)抗(kang)(kang)(kang)千(qian)擾(rao)(rao)性(xing)(xing)和(he)抗(kang)(kang)(kang)低頻(pin)干(gan)擾(rao)(rao)能(neng)(neng)力，即使(shi)在惡劣(lie)的(de)(de)(de)環境(jing)(jing)下(xia)也(ye)能(neng)(neng)保(bao)持較(jiao)(jiao)(jiao)好(hao)的(de)(de)(de)性(xing)(xing)能(neng)(neng)。因此無(wu)(wu)(wu)線(xian)(xian)(xian)系統(tong)有(you)較(jiao)(jiao)(jiao)高的(de)(de)(de)可(ke)靠性(xing)(xing)。

2.功(gong)耗小、不受天氣、濕(shi)度的影響

無線對講(jiang)系統在不(bu)(bu)同的(de)環(huan)境中(zhong)，無線通(tong)信設(she)備(bei)和有(you)線通(tong)信設(she)備(bei)一(yi)(yi)樣都要(yao)進(jin)行電(dian)能的(de)消(xiao)耗(hao)。當環(huan)境溫(wen)度(du)在-40°C以下時(shi)，無線通(tong)信設(she)備(bei)需要(yao)每(mei)天(tian)工(gong)(gong)作8小時(shi)左右;當環(huan)境溫(wen)度(du)為(wei)(wei)-20°C時(shi)，每(mei)天(tian)工(gong)(gong)作8小時(shi)左右;當環(huan)境溫(wen)度(du)為(wei)(wei)-30°C時(shi)，每(mei)天(tian)工(gong)(gong)作4小時(shi)左右。目前市場上(shang)常見(jian)的(de)無線對講(jiang)系統有(you)兩(liang)種電(dian)源(yuan)輸入(ru)方式(shi)(shi)，一(yi)(yi)種是(shi)電(dian)源(yuan)輸入(ru)，另一(yi)(yi)種是(shi)電(dian)源(yuan)輸出。從這兩(liang)種方式(shi)(shi)對系統的(de)功耗(hao)來看，電(dian)源(yuan)輸入(ru)方式(shi)(shi)的(de)功耗(hao)更大一(yi)(yi)些，但是(shi)功耗(hao)很小。并且設(she)備(bei)的(de)工(gong)(gong)作環(huan)境不(bu)(bu)同，對電(dian)池的(de)需求量(liang)也不(bu)(bu)同，所以功耗(hao)也不(bu)(bu)同。

3信號不受干擾

在一(yi)些有(you)干(gan)擾(rao)(rao)的(de)(de)(de)地方(fang)，例(li)如野外(wai)、機場、工廠(chang)等，一(yi)般采(cai)(cai)用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)方(fang)式。分(fen)(fen)(fen)(fen)(fen)頻(pin)方(fang)式的(de)(de)(de)抗干(gan)擾(rao)(rao)能(neng)力不(bu)強(qiang)，其(qi)抗干(gan)擾(rao)(rao)能(neng)力主(zhu)要取決(jue)于(yu)(yu)射(she)(she)頻(pin)功(gong)(gong)率的(de)(de)(de)大小。分(fen)(fen)(fen)(fen)(fen)頻(pin)技(ji)(ji)術(shu)(shu)的(de)(de)(de)功(gong)(gong)率一(yi)般是50dB在50dB左右時(shi)，其(qi)抗干(gan)擾(rao)(rao)能(neng)力強(qiang)。但由(you)于(yu)(yu)分(fen)(fen)(fen)(fen)(fen)頻(pin)的(de)(de)(de)干(gan)擾(rao)(rao)與噪聲(sheng)(sheng)(主(zhu)要是周(zhou)邊噪聲(sheng)(sheng))具有(you)很強(qiang)的(de)(de)(de)互通性(xing)，當分(fen)(fen)(fen)(fen)(fen)頻(pin)發(fa)(fa)射(she)(she)的(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)超(chao)過50dB時(shi)，其(qi)抗千(qian)擾(rao)(rao)能(neng)力就(jiu)會減弱。另外(wai)，在一(yi)些有(you)噪音(yin)的(de)(de)(de)環境中(zhong)使(shi)用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)技(ji)(ji)術(shu)(shu)，會使(shi)分(fen)(fen)(fen)(fen)(fen)頻(pin)信(xin)(xin)(xin)號(hao)(hao)無法到(dao)達發(fa)(fa)射(she)(she)端(duan)的(de)(de)(de)接(jie)收機或者造成發(fa)(fa)射(she)(she)端(duan)信(xin)(xin)(xin)號(hao)(hao)與接(jie)收端(duan)信(xin)(xin)(xin)號(hao)(hao)的(de)(de)(de)糟合而(er)造成分(fen)(fen)(fen)(fen)(fen)頻(pin)或干(gan)擾(rao)(rao)(例(li)如在使(shi)用(yong)(yong)室外(wai)電話(hua)時(shi)) 。而(er)采(cai)(cai)用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)技(ji)(ji)術(shu)(shu)的(de)(de)(de)無線對講系統(tong)由(you)于(yu)(yu)發(fa)(fa)射(she)(she)功(gong)(gong)率小，分(fen)(fen)(fen)(fen)(fen)頻(pin)后(hou)的(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)強(qiang)度比有(you)線對講系統(tong)高很多(在實(shi)際使(shi)用(yong)(yong)中(zhong)分(fen)(fen)(fen)(fen)(fen)頻(pin)設備一(yi)般可(ke)以(yi)將系統(tong)信(xin)(xin)(xin)號(hao)(hao)分(fen)(fen)(fen)(fen)(fen)頻(pin)到(dao)50dB以(yi)上),信(xin)(xin)(xin)號(hao)(hao)不(bu)受干(gan)擾(rao)(rao)。如果采(cai)(cai)用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)技(ji)(ji)術(shu)(shu)，需要在較(jiao)大的(de)(de)(de)回波(bo)功(gong)(gong)率下才能(neng)實(shi)現(xian)信(xin)(xin)(xin)號(hao)(hao)的(de)(de)(de)分(fen)(fen)(fen)(fen)(fen)頻(pin)工作(如分(fen)(fen)(fen)(fen)(fen)頻(pin)器(qi)發(fa)(fa)射(she)(she)信(xin)(xin)(xin)號(hao)(hao)與接(jie)收信(xin)(xin)(xin)號(hao)(hao)重疊時(shi)產生的(de)(de)(de)千(qian)擾(rao)(rao))和發(fa)(fa)送信(xin)(xin)(xin)號(hao)(hao)強(qiang)度降低(同(tong)頻(pin)帶(dai)內的(de)(de)(de)兩只(zhi)天(tian)線對同(tong)一(yi)信(xin)(xin)(xin)道傳輸的(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)強(qiang)度基(ji)本一(yi)致);如果采(cai)(cai)用(yong)(yong)混響技(ji)(ji)術(shu)(shu)，則可(ke)以(yi)實(shi)現(xian)對無線信(xin)(xin)(xin)號(hao)(hao)干(gan)擾(rao)(rao)的(de)(de)(de)抑制(zhi)或降低。