由于在(zai)戶(hu)外、室(shi)內等(deng)區域(yu)，無線(xian)(xian)(xian)對講(jiang)系統(tong)的(de)(de)信(xin)號強度較(jiao)(jiao)弱(ruo)，而且采用(yong)(yong)(yong)頻率調制(zhi)技術（如 MHZ、 NMR、 BSI等(deng)）產(chan)生的(de)(de)信(xin)號傳輸(shu)時(shi)(shi)延大，傳輸(shu)距離(li)遠。因此有線(xian)(xian)(xian)對講(jiang)系統(tong)不(bu)適合在(zai)戶(hu)外環境(jing)使(shi)(shi)(shi)用(yong)(yong)(yong)，特別(bie)是(shi)在(zai)冬天(tian)及低風速季節(jie)使(shi)(shi)(shi)用(yong)(yong)(yong)。雖(sui)然無線(xian)(xian)(xian)對講(jiang)系統(tong)也有著(zhu)不(bu)錯(cuo)的(de)(de)效果。但(dan)由于系統(tong)工作時(shi)(shi)會有一定的(de)(de)干擾(rao)，使(shi)(shi)(shi)對講(jiang)效果下(xia)(xia)(xia)降(jiang)，另外在(zai)信(xin)號較(jiao)(jiao)弱(ruo)時(shi)(shi)對用(yong)(yong)(yong)戶(hu)語音產(chan)生了(le)影響。特別(bie)是(shi)在(zai)人員復(fu)雜、通信(xin)距離(li)較(jiao)(jiao)短或需要(yao)較(jiao)(jiao)長時(shi)(shi)間(jian)使(shi)(shi)(shi)用(yong)(yong)(yong)時(shi)(shi)。因此，更(geng)需要(yao)有一個(ge)可(ke)靠的(de)(de)無線(xian)(xian)(xian)對講(jiang)系統(tong)提供與有線(xian)(xian)(xian)對講(jiang)系統(tong)一樣的(de)(de)語音信(xin)息與控制(zhi)。無線(xian)(xian)(xian)對講(jiang)系統(tong)具有很高的(de)(de)靈(ling)活性，它能(neng)夠(gou)滿足現場中所有環境(jing)使(shi)(shi)(shi)用(yong)(yong)(yong)需求并能(neng)隨(sui)(sui)(sui)時(shi)(shi)切(qie)換(huan)（如在(zai)野外、戶(hu)外電話等(deng)),用(yong)(yong)(yong)戶(hu)可(ke)以在(zai)任(ren)何地點(dian)使(shi)(shi)(shi)用(yong)(yong)(yong)、隨(sui)(sui)(sui)時(shi)(shi)、隨(sui)(sui)(sui)地進行通訊(xun)。使(shi)(shi)(shi)用(yong)(yong)(yong)方便(bian)、節(jie)省(sheng)成本、節(jie)約費用(yong)(yong)(yong)。下(xia)(xia)(xia)面我們(men)來(lai)了(le)解一下(xia)(xia)(xia)無線(xian)(xian)(xian)對講(jiang)系統(tong)它主要(yao)是(shi)什么優點(dian)？

1.性(xing)能穩(wen)定(ding)，可靠性(xing)高

在(zai)相同無(wu)線(xian)(xian)(xian)傳(chuan)輸距離下(xia)，無(wu)線(xian)(xian)(xian)傳(chuan)輸信(xin)號(hao)更穩(wen)定(ding)由于使(shi)用了功率放大器來對無(wu)線(xian)(xian)(xian)信(xin)號(hao)進(jin)行壓縮(suo)和(he)放大，使(shi)無(wu)線(xian)(xian)(xian)信(xin)號(hao)更加穩(wen)定(ding)可(ke)(ke)(ke)靠。無(wu)線(xian)(xian)(xian)信(xin)號(hao)在(zai)弱電磁環境下(xia)也(ye)能(neng)(neng)保(bao)(bao)(bao)持(chi)較(jiao)好(hao)的(de)(de)性(xing)能(neng)(neng)。無(wu)線(xian)(xian)(xian)對講系(xi)統具(ju)(ju)有(you)發(fa)射(she)(she)功率小、抗千(qian)擾(rao)(rao)(rao)(rao)能(neng)(neng)力強(qiang)(與(yu)(yu)有(you)線(xian)(xian)(xian)對講系(xi)統比(bi)較(jiao))和(he)抗電磁干(gan)擾(rao)(rao)(rao)(rao)能(neng)(neng)力強(qiang)(與(yu)(yu)有(you)線(xian)(xian)(xian)對講系(xi)統比(bi)較(jiao))的(de)(de)特點。無(wu)線(xian)(xian)(xian)對講系(xi)統發(fa)射(she)(she)信(xin)號(hao)在(zai)發(fa)射(she)(she)前和(he)發(fa)射(she)(she)后均能(neng)(neng)保(bao)(bao)(bao)持(chi)良好(hao)的(de)(de)性(xing)能(neng)(neng)，使(shi)用過程中，發(fa)射(she)(she)信(xin)號(hao)與(yu)(yu)接收信(xin)號(hao)完全不受任何千(qian)擾(rao)(rao)(rao)(rao)，可(ke)(ke)(ke)保(bao)(bao)(bao)持(chi)很好(hao)的(de)(de)穩(wen)定(ding)性(xing)，具(ju)(ju)有(you)良好(hao)的(de)(de)抗千(qian)擾(rao)(rao)(rao)(rao)性(xing)和(he)抗低頻(pin)干(gan)擾(rao)(rao)(rao)(rao)能(neng)(neng)力，即使(shi)在(zai)惡劣(lie)的(de)(de)環境下(xia)也(ye)能(neng)(neng)保(bao)(bao)(bao)持(chi)較(jiao)好(hao)的(de)(de)性(xing)能(neng)(neng)。因此無(wu)線(xian)(xian)(xian)系(xi)統有(you)較(jiao)高的(de)(de)可(ke)(ke)(ke)靠性(xing)。

2.功耗小(xiao)、不受天氣(qi)、濕度(du)的影響

無線(xian)對(dui)講(jiang)系(xi)(xi)統(tong)(tong)在不(bu)(bu)同的(de)環(huan)境中，無線(xian)通(tong)信設(she)備和有(you)線(xian)通(tong)信設(she)備一(yi)樣(yang)都要進行電(dian)能(neng)的(de)消耗。當(dang)環(huan)境溫(wen)度在-40°C以下時(shi)，無線(xian)通(tong)信設(she)備需(xu)要每(mei)天(tian)(tian)工(gong)(gong)作8小(xiao)(xiao)時(shi)左右(you)(you);當(dang)環(huan)境溫(wen)度為(wei)(wei)-20°C時(shi)，每(mei)天(tian)(tian)工(gong)(gong)作8小(xiao)(xiao)時(shi)左右(you)(you);當(dang)環(huan)境溫(wen)度為(wei)(wei)-30°C時(shi)，每(mei)天(tian)(tian)工(gong)(gong)作4小(xiao)(xiao)時(shi)左右(you)(you)。目前市場上常見的(de)無線(xian)對(dui)講(jiang)系(xi)(xi)統(tong)(tong)有(you)兩種電(dian)源(yuan)(yuan)(yuan)輸(shu)入(ru)(ru)方式(shi)(shi)，一(yi)種是電(dian)源(yuan)(yuan)(yuan)輸(shu)入(ru)(ru)，另一(yi)種是電(dian)源(yuan)(yuan)(yuan)輸(shu)出(chu)。從這(zhe)兩種方式(shi)(shi)對(dui)系(xi)(xi)統(tong)(tong)的(de)功耗來看，電(dian)源(yuan)(yuan)(yuan)輸(shu)入(ru)(ru)方式(shi)(shi)的(de)功耗更大(da)一(yi)些，但是功耗很小(xiao)(xiao)。并(bing)且設(she)備的(de)工(gong)(gong)作環(huan)境不(bu)(bu)同，對(dui)電(dian)池的(de)需(xu)求量也不(bu)(bu)同，所以功耗也不(bu)(bu)同。

3信號不受干擾

在(zai)一(yi)些(xie)(xie)有(you)干(gan)擾(rao)(rao)(rao)的(de)(de)(de)(de)地方，例如(ru)野外(wai)(wai)、機場、工廠等(deng)，一(yi)般(ban)采用(yong)分(fen)頻(pin)(pin)(pin)(pin)(pin)方式(shi)。分(fen)頻(pin)(pin)(pin)(pin)(pin)方式(shi)的(de)(de)(de)(de)抗干(gan)擾(rao)(rao)(rao)能力(li)不強，其(qi)抗干(gan)擾(rao)(rao)(rao)能力(li)主(zhu)要(yao)取決于射(she)頻(pin)(pin)(pin)(pin)(pin)功(gong)率(lv)(lv)的(de)(de)(de)(de)大小(xiao)。分(fen)頻(pin)(pin)(pin)(pin)(pin)技術(shu)(shu)(shu)的(de)(de)(de)(de)功(gong)率(lv)(lv)一(yi)般(ban)是(shi)50dB在(zai)50dB左右(you)時，其(qi)抗干(gan)擾(rao)(rao)(rao)能力(li)強。但由于分(fen)頻(pin)(pin)(pin)(pin)(pin)的(de)(de)(de)(de)干(gan)擾(rao)(rao)(rao)與噪(zao)聲(sheng)(主(zhu)要(yao)是(shi)周邊噪(zao)聲(sheng))具有(you)很強的(de)(de)(de)(de)互通性，當分(fen)頻(pin)(pin)(pin)(pin)(pin)發(fa)(fa)(fa)射(she)的(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)超過50dB時，其(qi)抗千擾(rao)(rao)(rao)能力(li)就會(hui)減(jian)弱。另外(wai)(wai)，在(zai)一(yi)些(xie)(xie)有(you)噪(zao)音的(de)(de)(de)(de)環境中(zhong)(zhong)使(shi)用(yong)分(fen)頻(pin)(pin)(pin)(pin)(pin)技術(shu)(shu)(shu)，會(hui)使(shi)分(fen)頻(pin)(pin)(pin)(pin)(pin)信(xin)(xin)(xin)(xin)號(hao)(hao)無法到達發(fa)(fa)(fa)射(she)端的(de)(de)(de)(de)接收(shou)機或者(zhe)造成(cheng)發(fa)(fa)(fa)射(she)端信(xin)(xin)(xin)(xin)號(hao)(hao)與接收(shou)端信(xin)(xin)(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)糟合而(er)造成(cheng)分(fen)頻(pin)(pin)(pin)(pin)(pin)或干(gan)擾(rao)(rao)(rao)(例如(ru)在(zai)使(shi)用(yong)室外(wai)(wai)電話(hua)時) 。而(er)采用(yong)分(fen)頻(pin)(pin)(pin)(pin)(pin)技術(shu)(shu)(shu)的(de)(de)(de)(de)無線對(dui)講系統由于發(fa)(fa)(fa)射(she)功(gong)率(lv)(lv)小(xiao)，分(fen)頻(pin)(pin)(pin)(pin)(pin)后的(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)強度(du)比有(you)線對(dui)講系統高很多(在(zai)實(shi)際使(shi)用(yong)中(zhong)(zhong)分(fen)頻(pin)(pin)(pin)(pin)(pin)設(she)備一(yi)般(ban)可(ke)以將系統信(xin)(xin)(xin)(xin)號(hao)(hao)分(fen)頻(pin)(pin)(pin)(pin)(pin)到50dB以上),信(xin)(xin)(xin)(xin)號(hao)(hao)不受干(gan)擾(rao)(rao)(rao)。如(ru)果采用(yong)分(fen)頻(pin)(pin)(pin)(pin)(pin)技術(shu)(shu)(shu)，需要(yao)在(zai)較大的(de)(de)(de)(de)回波功(gong)率(lv)(lv)下才能實(shi)現(xian)信(xin)(xin)(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)分(fen)頻(pin)(pin)(pin)(pin)(pin)工作(如(ru)分(fen)頻(pin)(pin)(pin)(pin)(pin)器發(fa)(fa)(fa)射(she)信(xin)(xin)(xin)(xin)號(hao)(hao)與接收(shou)信(xin)(xin)(xin)(xin)號(hao)(hao)重(zhong)疊(die)時產生的(de)(de)(de)(de)千擾(rao)(rao)(rao))和發(fa)(fa)(fa)送信(xin)(xin)(xin)(xin)號(hao)(hao)強度(du)降低(同(tong)頻(pin)(pin)(pin)(pin)(pin)帶(dai)內的(de)(de)(de)(de)兩只天線對(dui)同(tong)一(yi)信(xin)(xin)(xin)(xin)道(dao)傳輸的(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)強度(du)基本一(yi)致);如(ru)果采用(yong)混響技術(shu)(shu)(shu)，則可(ke)以實(shi)現(xian)對(dui)無線信(xin)(xin)(xin)(xin)號(hao)(hao)干(gan)擾(rao)(rao)(rao)的(de)(de)(de)(de)抑制或降低。