由于在(zai)(zai)戶外(wai)、室內(nei)等區域，無線對(dui)(dui)(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)的(de)(de)信號(hao)強度較(jiao)弱(ruo)(ruo)，而(er)且(qie)采用(yong)(yong)(yong)頻率調制技術（如(ru) MHZ、 NMR、 BSI等）產(chan)生(sheng)(sheng)的(de)(de)信號(hao)傳輸時(shi)(shi)延大，傳輸距(ju)離遠(yuan)。因此有線對(dui)(dui)(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)不(bu)適合(he)在(zai)(zai)戶外(wai)環(huan)境(jing)使(shi)用(yong)(yong)(yong)，特(te)別是在(zai)(zai)冬天及低(di)風(feng)速季(ji)節使(shi)用(yong)(yong)(yong)。雖(sui)然無線對(dui)(dui)(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)也有著不(bu)錯的(de)(de)效果(guo)。但由于系(xi)統(tong)(tong)(tong)工(gong)作(zuo)時(shi)(shi)會有一(yi)定的(de)(de)干(gan)擾，使(shi)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)效果(guo)下(xia)降，另外(wai)在(zai)(zai)信號(hao)較(jiao)弱(ruo)(ruo)時(shi)(shi)對(dui)(dui)(dui)用(yong)(yong)(yong)戶語音產(chan)生(sheng)(sheng)了影響。特(te)別是在(zai)(zai)人員(yuan)復雜、通信距(ju)離較(jiao)短或(huo)需要(yao)較(jiao)長時(shi)(shi)間(jian)使(shi)用(yong)(yong)(yong)時(shi)(shi)。因此，更需要(yao)有一(yi)個可靠的(de)(de)無線對(dui)(dui)(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)提供與有線對(dui)(dui)(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)一(yi)樣(yang)的(de)(de)語音信息與控(kong)制。無線對(dui)(dui)(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)具有很高的(de)(de)靈活性，它能夠滿足現場中(zhong)所有環(huan)境(jing)使(shi)用(yong)(yong)(yong)需求并能隨(sui)時(shi)(shi)切換（如(ru)在(zai)(zai)野外(wai)、戶外(wai)電(dian)話(hua)等),用(yong)(yong)(yong)戶可以(yi)在(zai)(zai)任何(he)地(di)(di)點(dian)(dian)使(shi)用(yong)(yong)(yong)、隨(sui)時(shi)(shi)、隨(sui)地(di)(di)進(jin)行通訊。使(shi)用(yong)(yong)(yong)方便、節省成本、節約費用(yong)(yong)(yong)。下(xia)面我們來了解(jie)一(yi)下(xia)無線對(dui)(dui)(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)它主要(yao)是什(shen)么優點(dian)(dian)？

1.性能穩(wen)定(ding)，可靠(kao)性高(gao)

在相同(tong)無(wu)線(xian)傳輸(shu)距離下(xia)，無(wu)線(xian)傳輸(shu)信號更(geng)穩定(ding)由于使(shi)用了功率放大器(qi)來對(dui)無(wu)線(xian)信號進行壓(ya)縮和(he)放大，使(shi)無(wu)線(xian)信號更(geng)加穩定(ding)可(ke)(ke)靠(kao)。無(wu)線(xian)信號在弱電(dian)磁(ci)環(huan)境(jing)下(xia)也能(neng)(neng)保(bao)持較好的(de)(de)(de)性(xing)(xing)(xing)(xing)能(neng)(neng)。無(wu)線(xian)對(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)具有發射(she)功率小(xiao)、抗(kang)千(qian)擾能(neng)(neng)力(li)強(qiang)(與有線(xian)對(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)比較)和(he)抗(kang)電(dian)磁(ci)干擾能(neng)(neng)力(li)強(qiang)(與有線(xian)對(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)比較)的(de)(de)(de)特點。無(wu)線(xian)對(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)發射(she)信號在發射(she)前和(he)發射(she)后均能(neng)(neng)保(bao)持良(liang)好的(de)(de)(de)性(xing)(xing)(xing)(xing)能(neng)(neng)，使(shi)用過程中，發射(she)信號與接收(shou)信號完全不受(shou)任何(he)千(qian)擾，可(ke)(ke)保(bao)持很好的(de)(de)(de)穩定(ding)性(xing)(xing)(xing)(xing)，具有良(liang)好的(de)(de)(de)抗(kang)千(qian)擾性(xing)(xing)(xing)(xing)和(he)抗(kang)低(di)頻(pin)干擾能(neng)(neng)力(li)，即使(shi)在惡劣的(de)(de)(de)環(huan)境(jing)下(xia)也能(neng)(neng)保(bao)持較好的(de)(de)(de)性(xing)(xing)(xing)(xing)能(neng)(neng)。因此(ci)無(wu)線(xian)系(xi)統(tong)(tong)(tong)有較高的(de)(de)(de)可(ke)(ke)靠(kao)性(xing)(xing)(xing)(xing)。

2.功耗小、不受天氣(qi)、濕度(du)的影響

無線(xian)對講系統在不(bu)(bu)同(tong)(tong)的(de)環境中，無線(xian)通信設備和有線(xian)通信設備一(yi)樣都要(yao)進行電(dian)能(neng)的(de)消耗(hao)。當(dang)環境溫(wen)(wen)度在-40°C以下(xia)時(shi)(shi)(shi)(shi)，無線(xian)通信設備需要(yao)每(mei)天(tian)工作8小時(shi)(shi)(shi)(shi)左右;當(dang)環境溫(wen)(wen)度為(wei)-20°C時(shi)(shi)(shi)(shi)，每(mei)天(tian)工作8小時(shi)(shi)(shi)(shi)左右;當(dang)環境溫(wen)(wen)度為(wei)-30°C時(shi)(shi)(shi)(shi)，每(mei)天(tian)工作4小時(shi)(shi)(shi)(shi)左右。目前市場上常見的(de)無線(xian)對講系統有兩種電(dian)源輸(shu)入方式(shi)，一(yi)種是(shi)電(dian)源輸(shu)入，另一(yi)種是(shi)電(dian)源輸(shu)出。從(cong)這兩種方式(shi)對系統的(de)功(gong)(gong)耗(hao)來(lai)看，電(dian)源輸(shu)入方式(shi)的(de)功(gong)(gong)耗(hao)更大一(yi)些，但是(shi)功(gong)(gong)耗(hao)很小。并且設備的(de)工作環境不(bu)(bu)同(tong)(tong)，對電(dian)池(chi)的(de)需求量也不(bu)(bu)同(tong)(tong)，所(suo)以功(gong)(gong)耗(hao)也不(bu)(bu)同(tong)(tong)。

3信號不受干擾

在(zai)一(yi)些(xie)有干(gan)(gan)(gan)擾(rao)(rao)的(de)(de)(de)地方(fang)(fang)，例(li)如(ru)(ru)野外、機場、工廠等(deng)，一(yi)般采(cai)用(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)方(fang)(fang)式(shi)。分(fen)(fen)(fen)頻(pin)(pin)(pin)方(fang)(fang)式(shi)的(de)(de)(de)抗(kang)干(gan)(gan)(gan)擾(rao)(rao)能(neng)力不強(qiang)，其抗(kang)干(gan)(gan)(gan)擾(rao)(rao)能(neng)力主要取決(jue)于射(she)(she)頻(pin)(pin)(pin)功率(lv)的(de)(de)(de)大小。分(fen)(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)(shu)的(de)(de)(de)功率(lv)一(yi)般是(shi)50dB在(zai)50dB左(zuo)右時(shi)(shi)(shi)，其抗(kang)干(gan)(gan)(gan)擾(rao)(rao)能(neng)力強(qiang)。但由于分(fen)(fen)(fen)頻(pin)(pin)(pin)的(de)(de)(de)干(gan)(gan)(gan)擾(rao)(rao)與噪(zao)聲(sheng)(主要是(shi)周邊噪(zao)聲(sheng))具有很強(qiang)的(de)(de)(de)互(hu)通性，當分(fen)(fen)(fen)頻(pin)(pin)(pin)發(fa)(fa)射(she)(she)的(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)超過(guo)50dB時(shi)(shi)(shi)，其抗(kang)千擾(rao)(rao)能(neng)力就會(hui)(hui)減弱。另外，在(zai)一(yi)些(xie)有噪(zao)音的(de)(de)(de)環境中(zhong)使(shi)(shi)用(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)(shu)，會(hui)(hui)使(shi)(shi)分(fen)(fen)(fen)頻(pin)(pin)(pin)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)無(wu)(wu)法到(dao)達發(fa)(fa)射(she)(she)端的(de)(de)(de)接收機或(huo)(huo)者造成(cheng)發(fa)(fa)射(she)(she)端信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)與接收端信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)糟(zao)合而(er)造成(cheng)分(fen)(fen)(fen)頻(pin)(pin)(pin)或(huo)(huo)干(gan)(gan)(gan)擾(rao)(rao)(例(li)如(ru)(ru)在(zai)使(shi)(shi)用(yong)(yong)室外電話時(shi)(shi)(shi)) 。而(er)采(cai)用(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)(shu)的(de)(de)(de)無(wu)(wu)線(xian)對講(jiang)系(xi)統(tong)由于發(fa)(fa)射(she)(she)功率(lv)小，分(fen)(fen)(fen)頻(pin)(pin)(pin)后的(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)度比有線(xian)對講(jiang)系(xi)統(tong)高(gao)很多(在(zai)實際使(shi)(shi)用(yong)(yong)中(zhong)分(fen)(fen)(fen)頻(pin)(pin)(pin)設備(bei)一(yi)般可(ke)以將系(xi)統(tong)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)分(fen)(fen)(fen)頻(pin)(pin)(pin)到(dao)50dB以上),信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)不受干(gan)(gan)(gan)擾(rao)(rao)。如(ru)(ru)果采(cai)用(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)(shu)，需要在(zai)較大的(de)(de)(de)回(hui)波功率(lv)下才能(neng)實現(xian)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)分(fen)(fen)(fen)頻(pin)(pin)(pin)工作(如(ru)(ru)分(fen)(fen)(fen)頻(pin)(pin)(pin)器發(fa)(fa)射(she)(she)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)與接收信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)重疊(die)時(shi)(shi)(shi)產生的(de)(de)(de)千擾(rao)(rao))和發(fa)(fa)送信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)度降低(同頻(pin)(pin)(pin)帶內的(de)(de)(de)兩只(zhi)天線(xian)對同一(yi)信(xin)(xin)(xin)(xin)道(dao)傳輸的(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)度基本一(yi)致);如(ru)(ru)果采(cai)用(yong)(yong)混響技(ji)術(shu)(shu)，則可(ke)以實現(xian)對無(wu)(wu)線(xian)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)干(gan)(gan)(gan)擾(rao)(rao)的(de)(de)(de)抑(yi)制或(huo)(huo)降低。