由于在(zai)戶(hu)外(wai)、室內(nei)等區域，無(wu)(wu)線(xian)(xian)(xian)對講(jiang)(jiang)系(xi)(xi)統(tong)(tong)的(de)(de)信(xin)號強(qiang)度較弱(ruo)，而且采用(yong)(yong)頻率調制技術（如 MHZ、 NMR、 BSI等）產生的(de)(de)信(xin)號傳輸時延大，傳輸距離遠(yuan)。因此有(you)(you)線(xian)(xian)(xian)對講(jiang)(jiang)系(xi)(xi)統(tong)(tong)不適合在(zai)戶(hu)外(wai)環境(jing)使(shi)(shi)(shi)用(yong)(yong)，特別是(shi)(shi)在(zai)冬天(tian)及低(di)風速季節使(shi)(shi)(shi)用(yong)(yong)。雖然無(wu)(wu)線(xian)(xian)(xian)對講(jiang)(jiang)系(xi)(xi)統(tong)(tong)也有(you)(you)著不錯的(de)(de)效果。但(dan)由于系(xi)(xi)統(tong)(tong)工(gong)作(zuo)時會有(you)(you)一(yi)定的(de)(de)干擾(rao)，使(shi)(shi)(shi)對講(jiang)(jiang)效果下(xia)降，另外(wai)在(zai)信(xin)號較弱(ruo)時對用(yong)(yong)戶(hu)語音(yin)產生了(le)影響。特別是(shi)(shi)在(zai)人員復雜(za)、通(tong)信(xin)距離較短或需要較長(chang)時間使(shi)(shi)(shi)用(yong)(yong)時。因此，更(geng)需要有(you)(you)一(yi)個可靠的(de)(de)無(wu)(wu)線(xian)(xian)(xian)對講(jiang)(jiang)系(xi)(xi)統(tong)(tong)提供與有(you)(you)線(xian)(xian)(xian)對講(jiang)(jiang)系(xi)(xi)統(tong)(tong)一(yi)樣的(de)(de)語音(yin)信(xin)息(xi)與控制。無(wu)(wu)線(xian)(xian)(xian)對講(jiang)(jiang)系(xi)(xi)統(tong)(tong)具有(you)(you)很高的(de)(de)靈活性，它能(neng)夠滿(man)足現場中所有(you)(you)環境(jing)使(shi)(shi)(shi)用(yong)(yong)需求并能(neng)隨時切換（如在(zai)野(ye)外(wai)、戶(hu)外(wai)電話等),用(yong)(yong)戶(hu)可以在(zai)任何地點(dian)使(shi)(shi)(shi)用(yong)(yong)、隨時、隨地進行通(tong)訊。使(shi)(shi)(shi)用(yong)(yong)方(fang)便、節省成本、節約(yue)費用(yong)(yong)。下(xia)面我們(men)來了(le)解一(yi)下(xia)無(wu)(wu)線(xian)(xian)(xian)對講(jiang)(jiang)系(xi)(xi)統(tong)(tong)它主要是(shi)(shi)什么優點(dian)？

1.性(xing)能穩定，可靠性(xing)高

在(zai)(zai)相(xiang)同無(wu)(wu)(wu)線(xian)傳輸(shu)距離(li)下(xia)，無(wu)(wu)(wu)線(xian)傳輸(shu)信號(hao)更(geng)穩(wen)定由于使(shi)用(yong)了功(gong)率放(fang)大器(qi)來對無(wu)(wu)(wu)線(xian)信號(hao)進(jin)行壓(ya)縮和放(fang)大，使(shi)無(wu)(wu)(wu)線(xian)信號(hao)更(geng)加穩(wen)定可靠。無(wu)(wu)(wu)線(xian)信號(hao)在(zai)(zai)弱(ruo)電磁(ci)環境下(xia)也(ye)能(neng)(neng)(neng)保持(chi)較(jiao)好的(de)性(xing)(xing)能(neng)(neng)(neng)。無(wu)(wu)(wu)線(xian)對講(jiang)系統具(ju)有(you)發(fa)(fa)射功(gong)率小、抗(kang)千(qian)擾能(neng)(neng)(neng)力強(與有(you)線(xian)對講(jiang)系統比較(jiao))和抗(kang)電磁(ci)干(gan)(gan)擾能(neng)(neng)(neng)力強(與有(you)線(xian)對講(jiang)系統比較(jiao))的(de)特點。無(wu)(wu)(wu)線(xian)對講(jiang)系統發(fa)(fa)射信號(hao)在(zai)(zai)發(fa)(fa)射前和發(fa)(fa)射后均能(neng)(neng)(neng)保持(chi)良好的(de)性(xing)(xing)能(neng)(neng)(neng)，使(shi)用(yong)過程中，發(fa)(fa)射信號(hao)與接收信號(hao)完全(quan)不受(shou)任何千(qian)擾，可保持(chi)很好的(de)穩(wen)定性(xing)(xing)，具(ju)有(you)良好的(de)抗(kang)千(qian)擾性(xing)(xing)和抗(kang)低頻干(gan)(gan)擾能(neng)(neng)(neng)力，即使(shi)在(zai)(zai)惡(e)劣的(de)環境下(xia)也(ye)能(neng)(neng)(neng)保持(chi)較(jiao)好的(de)性(xing)(xing)能(neng)(neng)(neng)。因此無(wu)(wu)(wu)線(xian)系統有(you)較(jiao)高的(de)可靠性(xing)(xing)。

2.功耗小、不受天(tian)氣、濕度的影(ying)響(xiang)

無(wu)線(xian)(xian)對講(jiang)系統在(zai)不(bu)(bu)同(tong)的(de)環(huan)境中，無(wu)線(xian)(xian)通信設(she)備(bei)(bei)(bei)和有線(xian)(xian)通信設(she)備(bei)(bei)(bei)一(yi)樣(yang)都要進(jin)行電(dian)(dian)(dian)(dian)(dian)(dian)能(neng)的(de)消耗(hao)(hao)。當環(huan)境溫度(du)(du)(du)在(zai)-40°C以(yi)下時，無(wu)線(xian)(xian)通信設(she)備(bei)(bei)(bei)需要每(mei)天(tian)工作(zuo)8小時左右;當環(huan)境溫度(du)(du)(du)為(wei)-20°C時，每(mei)天(tian)工作(zuo)8小時左右;當環(huan)境溫度(du)(du)(du)為(wei)-30°C時，每(mei)天(tian)工作(zuo)4小時左右。目前市場上常(chang)見的(de)無(wu)線(xian)(xian)對講(jiang)系統有兩種(zhong)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)輸(shu)(shu)入(ru)方式，一(yi)種(zhong)是電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)輸(shu)(shu)入(ru)，另一(yi)種(zhong)是電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)輸(shu)(shu)出。從這兩種(zhong)方式對系統的(de)功(gong)耗(hao)(hao)來看，電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)輸(shu)(shu)入(ru)方式的(de)功(gong)耗(hao)(hao)更大一(yi)些，但是功(gong)耗(hao)(hao)很小。并且設(she)備(bei)(bei)(bei)的(de)工作(zuo)環(huan)境不(bu)(bu)同(tong)，對電(dian)(dian)(dian)(dian)(dian)(dian)池的(de)需求量也(ye)不(bu)(bu)同(tong)，所以(yi)功(gong)耗(hao)(hao)也(ye)不(bu)(bu)同(tong)。

3信號不受干擾

在(zai)一些(xie)有(you)干(gan)擾(rao)(rao)(rao)的(de)(de)(de)(de)(de)(de)(de)地(di)方，例如(ru)野外、機場、工(gong)廠等，一般采(cai)用分(fen)(fen)頻(pin)(pin)(pin)方式。分(fen)(fen)頻(pin)(pin)(pin)方式的(de)(de)(de)(de)(de)(de)(de)抗(kang)干(gan)擾(rao)(rao)(rao)能力(li)(li)(li)不(bu)強(qiang)，其(qi)抗(kang)干(gan)擾(rao)(rao)(rao)能力(li)(li)(li)主要(yao)取(qu)決(jue)于(yu)(yu)射(she)頻(pin)(pin)(pin)功(gong)率的(de)(de)(de)(de)(de)(de)(de)大(da)(da)小。分(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)(de)(de)(de)(de)功(gong)率一般是(shi)50dB在(zai)50dB左右時，其(qi)抗(kang)干(gan)擾(rao)(rao)(rao)能力(li)(li)(li)強(qiang)。但由于(yu)(yu)分(fen)(fen)頻(pin)(pin)(pin)的(de)(de)(de)(de)(de)(de)(de)干(gan)擾(rao)(rao)(rao)與噪(zao)聲(主要(yao)是(shi)周邊(bian)噪(zao)聲)具有(you)很強(qiang)的(de)(de)(de)(de)(de)(de)(de)互通性，當分(fen)(fen)頻(pin)(pin)(pin)發射(she)的(de)(de)(de)(de)(de)(de)(de)信(xin)號(hao)超過50dB時，其(qi)抗(kang)千擾(rao)(rao)(rao)能力(li)(li)(li)就會(hui)減弱。另外，在(zai)一些(xie)有(you)噪(zao)音的(de)(de)(de)(de)(de)(de)(de)環境中使用分(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)，會(hui)使分(fen)(fen)頻(pin)(pin)(pin)信(xin)號(hao)無(wu)法到達(da)發射(she)端(duan)的(de)(de)(de)(de)(de)(de)(de)接收(shou)(shou)機或者造成發射(she)端(duan)信(xin)號(hao)與接收(shou)(shou)端(duan)信(xin)號(hao)的(de)(de)(de)(de)(de)(de)(de)糟(zao)合而造成分(fen)(fen)頻(pin)(pin)(pin)或干(gan)擾(rao)(rao)(rao)(例如(ru)在(zai)使用室(shi)外電話時) 。而采(cai)用分(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)(de)(de)(de)(de)無(wu)線(xian)對(dui)(dui)講(jiang)系統(tong)由于(yu)(yu)發射(she)功(gong)率小，分(fen)(fen)頻(pin)(pin)(pin)后(hou)的(de)(de)(de)(de)(de)(de)(de)信(xin)號(hao)強(qiang)度(du)(du)比有(you)線(xian)對(dui)(dui)講(jiang)系統(tong)高很多(在(zai)實(shi)際使用中分(fen)(fen)頻(pin)(pin)(pin)設備(bei)一般可(ke)以(yi)將系統(tong)信(xin)號(hao)分(fen)(fen)頻(pin)(pin)(pin)到50dB以(yi)上),信(xin)號(hao)不(bu)受干(gan)擾(rao)(rao)(rao)。如(ru)果(guo)采(cai)用分(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)，需要(yao)在(zai)較大(da)(da)的(de)(de)(de)(de)(de)(de)(de)回波(bo)功(gong)率下才能實(shi)現信(xin)號(hao)的(de)(de)(de)(de)(de)(de)(de)分(fen)(fen)頻(pin)(pin)(pin)工(gong)作(如(ru)分(fen)(fen)頻(pin)(pin)(pin)器發射(she)信(xin)號(hao)與接收(shou)(shou)信(xin)號(hao)重疊時產(chan)生(sheng)的(de)(de)(de)(de)(de)(de)(de)千擾(rao)(rao)(rao))和發送信(xin)號(hao)強(qiang)度(du)(du)降低(di)(同頻(pin)(pin)(pin)帶內的(de)(de)(de)(de)(de)(de)(de)兩只天線(xian)對(dui)(dui)同一信(xin)道傳輸的(de)(de)(de)(de)(de)(de)(de)信(xin)號(hao)強(qiang)度(du)(du)基本一致);如(ru)果(guo)采(cai)用混響技(ji)術(shu)，則可(ke)以(yi)實(shi)現對(dui)(dui)無(wu)線(xian)信(xin)號(hao)干(gan)擾(rao)(rao)(rao)的(de)(de)(de)(de)(de)(de)(de)抑制或降低(di)。