由于在(zai)戶(hu)(hu)(hu)外(wai)(wai)、室內等區域(yu)，無(wu)(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)統的信號強度較(jiao)(jiao)弱(ruo)(ruo)，而且采用(yong)(yong)(yong)頻率調制技術（如 MHZ、 NMR、 BSI等）產生(sheng)的信號傳輸時(shi)(shi)(shi)延(yan)大(da)，傳輸距離遠。因此(ci)有(you)(you)(you)(you)(you)線(xian)對(dui)講(jiang)(jiang)系(xi)統不(bu)適合在(zai)戶(hu)(hu)(hu)外(wai)(wai)環(huan)境(jing)使用(yong)(yong)(yong)，特(te)別是(shi)在(zai)冬天及(ji)低風(feng)速(su)季節使用(yong)(yong)(yong)。雖然無(wu)(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)統也有(you)(you)(you)(you)(you)著不(bu)錯的效果。但由于系(xi)統工作時(shi)(shi)(shi)會有(you)(you)(you)(you)(you)一定的干(gan)擾，使對(dui)講(jiang)(jiang)效果下降(jiang)，另外(wai)(wai)在(zai)信號較(jiao)(jiao)弱(ruo)(ruo)時(shi)(shi)(shi)對(dui)用(yong)(yong)(yong)戶(hu)(hu)(hu)語(yu)音產生(sheng)了影響。特(te)別是(shi)在(zai)人員(yuan)復雜、通信距離較(jiao)(jiao)短或需要(yao)較(jiao)(jiao)長時(shi)(shi)(shi)間使用(yong)(yong)(yong)時(shi)(shi)(shi)。因此(ci)，更需要(yao)有(you)(you)(you)(you)(you)一個可靠的無(wu)(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)統提(ti)供與(yu)有(you)(you)(you)(you)(you)線(xian)對(dui)講(jiang)(jiang)系(xi)統一樣的語(yu)音信息與(yu)控制。無(wu)(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)統具有(you)(you)(you)(you)(you)很高的靈活(huo)性，它能(neng)(neng)夠滿足現場中(zhong)所有(you)(you)(you)(you)(you)環(huan)境(jing)使用(yong)(yong)(yong)需求并能(neng)(neng)隨(sui)時(shi)(shi)(shi)切換（如在(zai)野外(wai)(wai)、戶(hu)(hu)(hu)外(wai)(wai)電話等),用(yong)(yong)(yong)戶(hu)(hu)(hu)可以在(zai)任(ren)何地點(dian)(dian)使用(yong)(yong)(yong)、隨(sui)時(shi)(shi)(shi)、隨(sui)地進行通訊。使用(yong)(yong)(yong)方便、節省成(cheng)本、節約費用(yong)(yong)(yong)。下面我(wo)們來了解一下無(wu)(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)統它主要(yao)是(shi)什么優點(dian)(dian)？

1.性能穩(wen)定，可靠性高

在(zai)相同無(wu)線(xian)(xian)傳輸距離下，無(wu)線(xian)(xian)傳輸信(xin)號更(geng)穩(wen)定(ding)由(you)于使用了(le)功率放大(da)器來對(dui)無(wu)線(xian)(xian)信(xin)號進行(xing)壓縮和放大(da)，使無(wu)線(xian)(xian)信(xin)號更(geng)加穩(wen)定(ding)可(ke)靠。無(wu)線(xian)(xian)信(xin)號在(zai)弱電磁環境下也(ye)能(neng)保(bao)(bao)(bao)持較(jiao)(jiao)(jiao)(jiao)好(hao)(hao)的(de)(de)性(xing)能(neng)。無(wu)線(xian)(xian)對(dui)講(jiang)(jiang)(jiang)系統(tong)(tong)(tong)具有(you)發(fa)射功率小、抗(kang)千(qian)擾能(neng)力強(與(yu)有(you)線(xian)(xian)對(dui)講(jiang)(jiang)(jiang)系統(tong)(tong)(tong)比較(jiao)(jiao)(jiao)(jiao))和抗(kang)電磁干(gan)擾能(neng)力強(與(yu)有(you)線(xian)(xian)對(dui)講(jiang)(jiang)(jiang)系統(tong)(tong)(tong)比較(jiao)(jiao)(jiao)(jiao))的(de)(de)特(te)點。無(wu)線(xian)(xian)對(dui)講(jiang)(jiang)(jiang)系統(tong)(tong)(tong)發(fa)射信(xin)號在(zai)發(fa)射前和發(fa)射后(hou)均能(neng)保(bao)(bao)(bao)持良(liang)好(hao)(hao)的(de)(de)性(xing)能(neng)，使用過程中(zhong)，發(fa)射信(xin)號與(yu)接(jie)收(shou)信(xin)號完全不(bu)受任何千(qian)擾，可(ke)保(bao)(bao)(bao)持很好(hao)(hao)的(de)(de)穩(wen)定(ding)性(xing)，具有(you)良(liang)好(hao)(hao)的(de)(de)抗(kang)千(qian)擾性(xing)和抗(kang)低頻(pin)干(gan)擾能(neng)力，即使在(zai)惡劣的(de)(de)環境下也(ye)能(neng)保(bao)(bao)(bao)持較(jiao)(jiao)(jiao)(jiao)好(hao)(hao)的(de)(de)性(xing)能(neng)。因此(ci)無(wu)線(xian)(xian)系統(tong)(tong)(tong)有(you)較(jiao)(jiao)(jiao)(jiao)高的(de)(de)可(ke)靠性(xing)。

2.功耗小、不(bu)受(shou)天氣、濕(shi)度的影響(xiang)

無線(xian)(xian)對(dui)講系統(tong)(tong)在(zai)不(bu)同(tong)的(de)(de)(de)環境(jing)中，無線(xian)(xian)通(tong)信(xin)設備(bei)和有線(xian)(xian)通(tong)信(xin)設備(bei)一樣都要進行電(dian)能的(de)(de)(de)消耗。當環境(jing)溫度(du)在(zai)-40°C以下時(shi)，無線(xian)(xian)通(tong)信(xin)設備(bei)需(xu)要每(mei)天(tian)工作8小(xiao)時(shi)左右;當環境(jing)溫度(du)為(wei)-20°C時(shi)，每(mei)天(tian)工作8小(xiao)時(shi)左右;當環境(jing)溫度(du)為(wei)-30°C時(shi)，每(mei)天(tian)工作4小(xiao)時(shi)左右。目前市場上常(chang)見的(de)(de)(de)無線(xian)(xian)對(dui)講系統(tong)(tong)有兩種(zhong)電(dian)源輸(shu)(shu)入方式，一種(zhong)是(shi)電(dian)源輸(shu)(shu)入，另一種(zhong)是(shi)電(dian)源輸(shu)(shu)出。從這兩種(zhong)方式對(dui)系統(tong)(tong)的(de)(de)(de)功(gong)(gong)耗來看，電(dian)源輸(shu)(shu)入方式的(de)(de)(de)功(gong)(gong)耗更大一些，但是(shi)功(gong)(gong)耗很小(xiao)。并且設備(bei)的(de)(de)(de)工作環境(jing)不(bu)同(tong)，對(dui)電(dian)池的(de)(de)(de)需(xu)求量也(ye)不(bu)同(tong)，所以功(gong)(gong)耗也(ye)不(bu)同(tong)。

3信號不受干擾

在一(yi)些有(you)干(gan)擾(rao)的(de)(de)地方(fang)，例(li)如(ru)野外(wai)、機場、工(gong)廠等，一(yi)般(ban)采用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)方(fang)式(shi)。分(fen)(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)方(fang)式(shi)的(de)(de)抗(kang)干(gan)擾(rao)能(neng)力(li)不強(qiang)，其抗(kang)干(gan)擾(rao)能(neng)力(li)主要(yao)取決于射(she)頻(pin)(pin)(pin)(pin)功(gong)率(lv)的(de)(de)大小。分(fen)(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技術(shu)(shu)的(de)(de)功(gong)率(lv)一(yi)般(ban)是50dB在50dB左右時，其抗(kang)干(gan)擾(rao)能(neng)力(li)強(qiang)。但由(you)于分(fen)(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)的(de)(de)干(gan)擾(rao)與噪(zao)聲(sheng)(主要(yao)是周邊(bian)噪(zao)聲(sheng))具(ju)有(you)很(hen)強(qiang)的(de)(de)互通(tong)性(xing)，當分(fen)(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)發(fa)(fa)射(she)的(de)(de)信(xin)號(hao)(hao)(hao)超(chao)過50dB時，其抗(kang)千擾(rao)能(neng)力(li)就會減弱。另外(wai)，在一(yi)些有(you)噪(zao)音的(de)(de)環(huan)境中使(shi)(shi)(shi)用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技術(shu)(shu)，會使(shi)(shi)(shi)分(fen)(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)信(xin)號(hao)(hao)(hao)無法(fa)到(dao)達發(fa)(fa)射(she)端(duan)的(de)(de)接(jie)收(shou)(shou)機或者造成(cheng)發(fa)(fa)射(she)端(duan)信(xin)號(hao)(hao)(hao)與接(jie)收(shou)(shou)端(duan)信(xin)號(hao)(hao)(hao)的(de)(de)糟合而造成(cheng)分(fen)(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)或干(gan)擾(rao)(例(li)如(ru)在使(shi)(shi)(shi)用(yong)(yong)室外(wai)電(dian)話時) 。而采用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技術(shu)(shu)的(de)(de)無線對(dui)(dui)講(jiang)系統由(you)于發(fa)(fa)射(she)功(gong)率(lv)小，分(fen)(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)后的(de)(de)信(xin)號(hao)(hao)(hao)強(qiang)度比(bi)有(you)線對(dui)(dui)講(jiang)系統高很(hen)多(在實(shi)際使(shi)(shi)(shi)用(yong)(yong)中分(fen)(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)設備一(yi)般(ban)可(ke)以(yi)將系統信(xin)號(hao)(hao)(hao)分(fen)(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)到(dao)50dB以(yi)上(shang)),信(xin)號(hao)(hao)(hao)不受(shou)干(gan)擾(rao)。如(ru)果(guo)采用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技術(shu)(shu)，需要(yao)在較大的(de)(de)回(hui)波功(gong)率(lv)下才能(neng)實(shi)現信(xin)號(hao)(hao)(hao)的(de)(de)分(fen)(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)工(gong)作(如(ru)分(fen)(fen)(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)器發(fa)(fa)射(she)信(xin)號(hao)(hao)(hao)與接(jie)收(shou)(shou)信(xin)號(hao)(hao)(hao)重疊時產生(sheng)的(de)(de)千擾(rao))和發(fa)(fa)送信(xin)號(hao)(hao)(hao)強(qiang)度降低(同頻(pin)(pin)(pin)(pin)帶內的(de)(de)兩(liang)只天線對(dui)(dui)同一(yi)信(xin)道傳輸的(de)(de)信(xin)號(hao)(hao)(hao)強(qiang)度基本(ben)一(yi)致(zhi));如(ru)果(guo)采用(yong)(yong)混響技術(shu)(shu)，則可(ke)以(yi)實(shi)現對(dui)(dui)無線信(xin)號(hao)(hao)(hao)干(gan)擾(rao)的(de)(de)抑制或降低。