由于在(zai)戶(hu)(hu)外(wai)(wai)、室(shi)內等(deng)區域，無(wu)線(xian)對講(jiang)(jiang)(jiang)系統(tong)(tong)(tong)的(de)(de)信號(hao)強(qiang)度較弱，而且采用(yong)(yong)頻率(lv)調制(zhi)技術（如(ru) MHZ、 NMR、 BSI等(deng)）產(chan)生(sheng)的(de)(de)信號(hao)傳(chuan)輸時(shi)(shi)延大，傳(chuan)輸距(ju)離(li)遠。因此有(you)線(xian)對講(jiang)(jiang)(jiang)系統(tong)(tong)(tong)不(bu)適合在(zai)戶(hu)(hu)外(wai)(wai)環境使(shi)(shi)(shi)(shi)用(yong)(yong)，特別(bie)是在(zai)冬天及低風速季節(jie)(jie)使(shi)(shi)(shi)(shi)用(yong)(yong)。雖然無(wu)線(xian)對講(jiang)(jiang)(jiang)系統(tong)(tong)(tong)也有(you)著(zhu)不(bu)錯的(de)(de)效果(guo)。但由于系統(tong)(tong)(tong)工作時(shi)(shi)會有(you)一定的(de)(de)干擾，使(shi)(shi)(shi)(shi)對講(jiang)(jiang)(jiang)效果(guo)下降，另外(wai)(wai)在(zai)信號(hao)較弱時(shi)(shi)對用(yong)(yong)戶(hu)(hu)語音產(chan)生(sheng)了影響。特別(bie)是在(zai)人員復雜、通信距(ju)離(li)較短或需要較長時(shi)(shi)間(jian)使(shi)(shi)(shi)(shi)用(yong)(yong)時(shi)(shi)。因此，更需要有(you)一個可(ke)靠的(de)(de)無(wu)線(xian)對講(jiang)(jiang)(jiang)系統(tong)(tong)(tong)提供與有(you)線(xian)對講(jiang)(jiang)(jiang)系統(tong)(tong)(tong)一樣的(de)(de)語音信息與控制(zhi)。無(wu)線(xian)對講(jiang)(jiang)(jiang)系統(tong)(tong)(tong)具有(you)很(hen)高的(de)(de)靈活性，它能(neng)夠滿足現場中所有(you)環境使(shi)(shi)(shi)(shi)用(yong)(yong)需求并能(neng)隨時(shi)(shi)切換(huan)（如(ru)在(zai)野外(wai)(wai)、戶(hu)(hu)外(wai)(wai)電話(hua)等(deng)),用(yong)(yong)戶(hu)(hu)可(ke)以在(zai)任何地(di)點使(shi)(shi)(shi)(shi)用(yong)(yong)、隨時(shi)(shi)、隨地(di)進(jin)行通訊。使(shi)(shi)(shi)(shi)用(yong)(yong)方便、節(jie)(jie)省成本、節(jie)(jie)約費用(yong)(yong)。下面(mian)我們來了解一下無(wu)線(xian)對講(jiang)(jiang)(jiang)系統(tong)(tong)(tong)它主要是什么優點？

1.性(xing)能(neng)穩定，可靠性(xing)高

在(zai)相同(tong)無(wu)(wu)(wu)(wu)線(xian)(xian)傳(chuan)輸(shu)距離下，無(wu)(wu)(wu)(wu)線(xian)(xian)傳(chuan)輸(shu)信(xin)(xin)號(hao)(hao)更(geng)穩定由于使(shi)用(yong)了功率放大(da)器來對無(wu)(wu)(wu)(wu)線(xian)(xian)信(xin)(xin)號(hao)(hao)進行壓(ya)縮和放大(da)，使(shi)無(wu)(wu)(wu)(wu)線(xian)(xian)信(xin)(xin)號(hao)(hao)更(geng)加(jia)穩定可(ke)(ke)(ke)靠。無(wu)(wu)(wu)(wu)線(xian)(xian)信(xin)(xin)號(hao)(hao)在(zai)弱電磁環(huan)境下也(ye)能(neng)保持較好(hao)的(de)(de)(de)(de)(de)性(xing)(xing)能(neng)。無(wu)(wu)(wu)(wu)線(xian)(xian)對講(jiang)系統(tong)具有(you)發(fa)(fa)射(she)功率小(xiao)、抗(kang)(kang)千擾(rao)能(neng)力強(qiang)(與有(you)線(xian)(xian)對講(jiang)系統(tong)比較)和抗(kang)(kang)電磁干(gan)擾(rao)能(neng)力強(qiang)(與有(you)線(xian)(xian)對講(jiang)系統(tong)比較)的(de)(de)(de)(de)(de)特(te)點。無(wu)(wu)(wu)(wu)線(xian)(xian)對講(jiang)系統(tong)發(fa)(fa)射(she)信(xin)(xin)號(hao)(hao)在(zai)發(fa)(fa)射(she)前和發(fa)(fa)射(she)后均能(neng)保持良(liang)好(hao)的(de)(de)(de)(de)(de)性(xing)(xing)能(neng)，使(shi)用(yong)過程中，發(fa)(fa)射(she)信(xin)(xin)號(hao)(hao)與接收信(xin)(xin)號(hao)(hao)完全不受任何千擾(rao)，可(ke)(ke)(ke)保持很(hen)好(hao)的(de)(de)(de)(de)(de)穩定性(xing)(xing)，具有(you)良(liang)好(hao)的(de)(de)(de)(de)(de)抗(kang)(kang)千擾(rao)性(xing)(xing)和抗(kang)(kang)低頻干(gan)擾(rao)能(neng)力，即使(shi)在(zai)惡劣的(de)(de)(de)(de)(de)環(huan)境下也(ye)能(neng)保持較好(hao)的(de)(de)(de)(de)(de)性(xing)(xing)能(neng)。因此(ci)無(wu)(wu)(wu)(wu)線(xian)(xian)系統(tong)有(you)較高(gao)的(de)(de)(de)(de)(de)可(ke)(ke)(ke)靠性(xing)(xing)。

2.功耗小、不受天(tian)氣、濕(shi)度的影(ying)響

無(wu)線(xian)對講系統在不(bu)同(tong)的(de)(de)環境(jing)中，無(wu)線(xian)通信設備(bei)(bei)和有線(xian)通信設備(bei)(bei)一(yi)樣都要(yao)進(jin)行(xing)電(dian)能的(de)(de)消耗(hao)(hao)。當環境(jing)溫(wen)度(du)在-40°C以下時(shi)，無(wu)線(xian)通信設備(bei)(bei)需要(yao)每天工(gong)作(zuo)8小(xiao)(xiao)時(shi)左右;當環境(jing)溫(wen)度(du)為(wei)-20°C時(shi)，每天工(gong)作(zuo)8小(xiao)(xiao)時(shi)左右;當環境(jing)溫(wen)度(du)為(wei)-30°C時(shi)，每天工(gong)作(zuo)4小(xiao)(xiao)時(shi)左右。目前市場上常見的(de)(de)無(wu)線(xian)對講系統有兩種(zhong)(zhong)電(dian)源(yuan)(yuan)輸(shu)(shu)入(ru)方式(shi)，一(yi)種(zhong)(zhong)是(shi)(shi)電(dian)源(yuan)(yuan)輸(shu)(shu)入(ru)，另一(yi)種(zhong)(zhong)是(shi)(shi)電(dian)源(yuan)(yuan)輸(shu)(shu)出。從這兩種(zhong)(zhong)方式(shi)對系統的(de)(de)功(gong)耗(hao)(hao)來看(kan)，電(dian)源(yuan)(yuan)輸(shu)(shu)入(ru)方式(shi)的(de)(de)功(gong)耗(hao)(hao)更(geng)大一(yi)些(xie)，但是(shi)(shi)功(gong)耗(hao)(hao)很小(xiao)(xiao)。并(bing)且設備(bei)(bei)的(de)(de)工(gong)作(zuo)環境(jing)不(bu)同(tong)，對電(dian)池的(de)(de)需求量也不(bu)同(tong)，所以功(gong)耗(hao)(hao)也不(bu)同(tong)。

3信號不受干擾

在(zai)一些(xie)有(you)干擾(rao)(rao)(rao)的(de)(de)(de)(de)(de)地方，例(li)如野(ye)外(wai)、機(ji)(ji)場、工(gong)廠等(deng)，一般采用(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)方式。分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)方式的(de)(de)(de)(de)(de)抗(kang)干擾(rao)(rao)(rao)能力不強(qiang)(qiang)(qiang)，其抗(kang)干擾(rao)(rao)(rao)能力主要(yao)取決于射(she)(she)頻(pin)(pin)(pin)(pin)(pin)(pin)功率的(de)(de)(de)(de)(de)大(da)小。分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)(de)(de)功率一般是(shi)50dB在(zai)50dB左右時，其抗(kang)干擾(rao)(rao)(rao)能力強(qiang)(qiang)(qiang)。但由于分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)的(de)(de)(de)(de)(de)干擾(rao)(rao)(rao)與噪聲(sheng)(sheng)(主要(yao)是(shi)周邊噪聲(sheng)(sheng))具有(you)很強(qiang)(qiang)(qiang)的(de)(de)(de)(de)(de)互通性，當分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)發(fa)(fa)射(she)(she)的(de)(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)超過50dB時，其抗(kang)千擾(rao)(rao)(rao)能力就會(hui)減弱。另外(wai)，在(zai)一些(xie)有(you)噪音的(de)(de)(de)(de)(de)環(huan)境中(zhong)(zhong)使(shi)用(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)，會(hui)使(shi)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)信(xin)(xin)號(hao)(hao)無法(fa)到(dao)(dao)達發(fa)(fa)射(she)(she)端(duan)的(de)(de)(de)(de)(de)接(jie)收機(ji)(ji)或(huo)者造成(cheng)發(fa)(fa)射(she)(she)端(duan)信(xin)(xin)號(hao)(hao)與接(jie)收端(duan)信(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)(de)糟合而造成(cheng)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)或(huo)干擾(rao)(rao)(rao)(例(li)如在(zai)使(shi)用(yong)室外(wai)電話時) 。而采用(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)(de)(de)無線(xian)對講系(xi)統由于發(fa)(fa)射(she)(she)功率小，分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)后的(de)(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)強(qiang)(qiang)(qiang)度比有(you)線(xian)對講系(xi)統高很多(在(zai)實際使(shi)用(yong)中(zhong)(zhong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)設(she)備一般可以將(jiang)系(xi)統信(xin)(xin)號(hao)(hao)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)到(dao)(dao)50dB以上),信(xin)(xin)號(hao)(hao)不受(shou)干擾(rao)(rao)(rao)。如果(guo)采用(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)，需要(yao)在(zai)較(jiao)大(da)的(de)(de)(de)(de)(de)回波功率下(xia)才(cai)能實現信(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)(de)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)工(gong)作(zuo)(如分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)器發(fa)(fa)射(she)(she)信(xin)(xin)號(hao)(hao)與接(jie)收信(xin)(xin)號(hao)(hao)重疊時產生的(de)(de)(de)(de)(de)千擾(rao)(rao)(rao))和發(fa)(fa)送信(xin)(xin)號(hao)(hao)強(qiang)(qiang)(qiang)度降(jiang)低(di)(同頻(pin)(pin)(pin)(pin)(pin)(pin)帶內的(de)(de)(de)(de)(de)兩只天(tian)線(xian)對同一信(xin)(xin)道傳輸(shu)的(de)(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)強(qiang)(qiang)(qiang)度基本一致);如果(guo)采用(yong)混(hun)響技(ji)術(shu)，則可以實現對無線(xian)信(xin)(xin)號(hao)(hao)干擾(rao)(rao)(rao)的(de)(de)(de)(de)(de)抑制或(huo)降(jiang)低(di)。