由于(yu)在(zai)(zai)(zai)戶外(wai)、室(shi)內等區域，無(wu)線(xian)(xian)(xian)(xian)對(dui)講(jiang)系統(tong)(tong)的(de)(de)(de)(de)信(xin)號(hao)強度較(jiao)弱(ruo)，而且采用(yong)(yong)(yong)頻率調制技術（如 MHZ、 NMR、 BSI等）產(chan)生的(de)(de)(de)(de)信(xin)號(hao)傳(chuan)輸(shu)時(shi)(shi)(shi)(shi)延(yan)大，傳(chuan)輸(shu)距離遠。因(yin)此(ci)有(you)(you)線(xian)(xian)(xian)(xian)對(dui)講(jiang)系統(tong)(tong)不適合(he)在(zai)(zai)(zai)戶外(wai)環境(jing)(jing)使(shi)用(yong)(yong)(yong)，特(te)別是(shi)在(zai)(zai)(zai)冬天及(ji)低風(feng)速季節(jie)(jie)使(shi)用(yong)(yong)(yong)。雖然(ran)無(wu)線(xian)(xian)(xian)(xian)對(dui)講(jiang)系統(tong)(tong)也有(you)(you)著不錯的(de)(de)(de)(de)效果(guo)。但由于(yu)系統(tong)(tong)工作時(shi)(shi)(shi)(shi)會有(you)(you)一定的(de)(de)(de)(de)干擾，使(shi)對(dui)講(jiang)效果(guo)下(xia)降，另外(wai)在(zai)(zai)(zai)信(xin)號(hao)較(jiao)弱(ruo)時(shi)(shi)(shi)(shi)對(dui)用(yong)(yong)(yong)戶語音產(chan)生了(le)影響。特(te)別是(shi)在(zai)(zai)(zai)人員(yuan)復(fu)雜、通(tong)信(xin)距離較(jiao)短或需(xu)(xu)(xu)要(yao)較(jiao)長(chang)時(shi)(shi)(shi)(shi)間使(shi)用(yong)(yong)(yong)時(shi)(shi)(shi)(shi)。因(yin)此(ci)，更需(xu)(xu)(xu)要(yao)有(you)(you)一個可(ke)靠的(de)(de)(de)(de)無(wu)線(xian)(xian)(xian)(xian)對(dui)講(jiang)系統(tong)(tong)提(ti)供與有(you)(you)線(xian)(xian)(xian)(xian)對(dui)講(jiang)系統(tong)(tong)一樣的(de)(de)(de)(de)語音信(xin)息與控(kong)制。無(wu)線(xian)(xian)(xian)(xian)對(dui)講(jiang)系統(tong)(tong)具有(you)(you)很(hen)高的(de)(de)(de)(de)靈活性，它(ta)能夠滿足現場中(zhong)所有(you)(you)環境(jing)(jing)使(shi)用(yong)(yong)(yong)需(xu)(xu)(xu)求并能隨時(shi)(shi)(shi)(shi)切換（如在(zai)(zai)(zai)野(ye)外(wai)、戶外(wai)電話等),用(yong)(yong)(yong)戶可(ke)以在(zai)(zai)(zai)任何(he)地點使(shi)用(yong)(yong)(yong)、隨時(shi)(shi)(shi)(shi)、隨地進行通(tong)訊。使(shi)用(yong)(yong)(yong)方便、節(jie)(jie)省成本、節(jie)(jie)約費用(yong)(yong)(yong)。下(xia)面(mian)我(wo)們來了(le)解一下(xia)無(wu)線(xian)(xian)(xian)(xian)對(dui)講(jiang)系統(tong)(tong)它(ta)主要(yao)是(shi)什么優點？

1.性(xing)能穩定，可靠性(xing)高

在相同無線(xian)(xian)傳輸距離下，無線(xian)(xian)傳輸信(xin)(xin)號(hao)(hao)更穩定(ding)由于(yu)使(shi)用了功(gong)率放(fang)大(da)器來對無線(xian)(xian)信(xin)(xin)號(hao)(hao)進(jin)行壓縮和(he)放(fang)大(da)，使(shi)無線(xian)(xian)信(xin)(xin)號(hao)(hao)更加穩定(ding)可(ke)(ke)靠(kao)。無線(xian)(xian)信(xin)(xin)號(hao)(hao)在弱電磁環境下也能(neng)保(bao)(bao)持(chi)較(jiao)好(hao)的(de)(de)性(xing)能(neng)。無線(xian)(xian)對講(jiang)(jiang)系(xi)(xi)(xi)統(tong)具有發(fa)(fa)射功(gong)率小、抗(kang)千擾(rao)能(neng)力強(與(yu)有線(xian)(xian)對講(jiang)(jiang)系(xi)(xi)(xi)統(tong)比較(jiao))和(he)抗(kang)電磁干(gan)擾(rao)能(neng)力強(與(yu)有線(xian)(xian)對講(jiang)(jiang)系(xi)(xi)(xi)統(tong)比較(jiao))的(de)(de)特點。無線(xian)(xian)對講(jiang)(jiang)系(xi)(xi)(xi)統(tong)發(fa)(fa)射信(xin)(xin)號(hao)(hao)在發(fa)(fa)射前和(he)發(fa)(fa)射后均(jun)能(neng)保(bao)(bao)持(chi)良好(hao)的(de)(de)性(xing)能(neng)，使(shi)用過程中，發(fa)(fa)射信(xin)(xin)號(hao)(hao)與(yu)接收(shou)信(xin)(xin)號(hao)(hao)完全(quan)不受任何千擾(rao)，可(ke)(ke)保(bao)(bao)持(chi)很好(hao)的(de)(de)穩定(ding)性(xing)，具有良好(hao)的(de)(de)抗(kang)千擾(rao)性(xing)和(he)抗(kang)低頻干(gan)擾(rao)能(neng)力，即使(shi)在惡(e)劣的(de)(de)環境下也能(neng)保(bao)(bao)持(chi)較(jiao)好(hao)的(de)(de)性(xing)能(neng)。因此無線(xian)(xian)系(xi)(xi)(xi)統(tong)有較(jiao)高的(de)(de)可(ke)(ke)靠(kao)性(xing)。

2.功(gong)耗(hao)小、不受天氣、濕度的影響

無(wu)線(xian)對(dui)講(jiang)系統在不同(tong)的(de)(de)(de)環境中，無(wu)線(xian)通(tong)信設(she)備(bei)和有線(xian)通(tong)信設(she)備(bei)一(yi)樣都要進行(xing)電(dian)能的(de)(de)(de)消(xiao)耗(hao)(hao)。當(dang)環境溫度(du)在-40°C以下(xia)時(shi)，無(wu)線(xian)通(tong)信設(she)備(bei)需(xu)要每天工作(zuo)8小(xiao)時(shi)左右;當(dang)環境溫度(du)為(wei)-20°C時(shi)，每天工作(zuo)8小(xiao)時(shi)左右;當(dang)環境溫度(du)為(wei)-30°C時(shi)，每天工作(zuo)4小(xiao)時(shi)左右。目(mu)前市(shi)場上常(chang)見的(de)(de)(de)無(wu)線(xian)對(dui)講(jiang)系統有兩(liang)種(zhong)電(dian)源輸(shu)入(ru)方(fang)式(shi)，一(yi)種(zhong)是電(dian)源輸(shu)入(ru)，另一(yi)種(zhong)是電(dian)源輸(shu)出(chu)。從這兩(liang)種(zhong)方(fang)式(shi)對(dui)系統的(de)(de)(de)功耗(hao)(hao)來看，電(dian)源輸(shu)入(ru)方(fang)式(shi)的(de)(de)(de)功耗(hao)(hao)更大一(yi)些，但是功耗(hao)(hao)很小(xiao)。并(bing)且設(she)備(bei)的(de)(de)(de)工作(zuo)環境不同(tong)，對(dui)電(dian)池的(de)(de)(de)需(xu)求量也不同(tong)，所以功耗(hao)(hao)也不同(tong)。

3信號不受干擾

在一(yi)些(xie)有干(gan)(gan)擾(rao)(rao)(rao)(rao)(rao)的(de)(de)(de)(de)地方(fang)，例(li)如野外、機場(chang)、工廠等(deng)，一(yi)般(ban)采(cai)用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)方(fang)式(shi)。分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)方(fang)式(shi)的(de)(de)(de)(de)抗(kang)(kang)(kang)干(gan)(gan)擾(rao)(rao)(rao)(rao)(rao)能力不強，其抗(kang)(kang)(kang)干(gan)(gan)擾(rao)(rao)(rao)(rao)(rao)能力主(zhu)要取(qu)決(jue)于射頻(pin)(pin)(pin)功(gong)(gong)率的(de)(de)(de)(de)大(da)小。分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)技術的(de)(de)(de)(de)功(gong)(gong)率一(yi)般(ban)是(shi)50dB在50dB左右時，其抗(kang)(kang)(kang)干(gan)(gan)擾(rao)(rao)(rao)(rao)(rao)能力強。但由(you)于分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)的(de)(de)(de)(de)干(gan)(gan)擾(rao)(rao)(rao)(rao)(rao)與噪聲(主(zhu)要是(shi)周邊(bian)噪聲)具(ju)有很(hen)強的(de)(de)(de)(de)互通性，當分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)發(fa)(fa)射的(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)超過50dB時，其抗(kang)(kang)(kang)千(qian)擾(rao)(rao)(rao)(rao)(rao)能力就會(hui)減弱(ruo)。另(ling)外，在一(yi)些(xie)有噪音(yin)的(de)(de)(de)(de)環境中使(shi)用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)技術，會(hui)使(shi)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)信(xin)(xin)號(hao)(hao)無(wu)(wu)法到(dao)達發(fa)(fa)射端(duan)的(de)(de)(de)(de)接收機或(huo)(huo)者造成(cheng)發(fa)(fa)射端(duan)信(xin)(xin)號(hao)(hao)與接收端(duan)信(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)糟合而造成(cheng)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)或(huo)(huo)干(gan)(gan)擾(rao)(rao)(rao)(rao)(rao)(例(li)如在使(shi)用(yong)(yong)室外電話時) 。而采(cai)用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)技術的(de)(de)(de)(de)無(wu)(wu)線對講系(xi)統(tong)由(you)于發(fa)(fa)射功(gong)(gong)率小，分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)后的(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)強度比(bi)有線對講系(xi)統(tong)高很(hen)多(在實際(ji)使(shi)用(yong)(yong)中分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)設(she)備一(yi)般(ban)可以將系(xi)統(tong)信(xin)(xin)號(hao)(hao)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)到(dao)50dB以上),信(xin)(xin)號(hao)(hao)不受干(gan)(gan)擾(rao)(rao)(rao)(rao)(rao)。如果采(cai)用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)技術，需(xu)要在較大(da)的(de)(de)(de)(de)回波(bo)功(gong)(gong)率下才能實現信(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)工作(如分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)器發(fa)(fa)射信(xin)(xin)號(hao)(hao)與接收信(xin)(xin)號(hao)(hao)重疊時產生的(de)(de)(de)(de)千(qian)擾(rao)(rao)(rao)(rao)(rao))和發(fa)(fa)送信(xin)(xin)號(hao)(hao)強度降(jiang)低(同頻(pin)(pin)(pin)帶內的(de)(de)(de)(de)兩只天(tian)線對同一(yi)信(xin)(xin)道傳輸的(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)強度基本一(yi)致);如果采(cai)用(yong)(yong)混響技術，則可以實現對無(wu)(wu)線信(xin)(xin)號(hao)(hao)干(gan)(gan)擾(rao)(rao)(rao)(rao)(rao)的(de)(de)(de)(de)抑制或(huo)(huo)降(jiang)低。