由于(yu)在(zai)(zai)戶(hu)外、室內(nei)等區域，無(wu)(wu)線(xian)(xian)對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)的(de)信號(hao)(hao)強(qiang)度較(jiao)弱，而(er)且采用(yong)(yong)(yong)(yong)(yong)頻(pin)率調制技術（如 MHZ、 NMR、 BSI等）產(chan)生(sheng)(sheng)的(de)信號(hao)(hao)傳輸時(shi)延大，傳輸距離遠。因此有線(xian)(xian)對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)不適(shi)合(he)在(zai)(zai)戶(hu)外環(huan)境使(shi)用(yong)(yong)(yong)(yong)(yong)，特別(bie)是(shi)(shi)(shi)在(zai)(zai)冬(dong)天(tian)及(ji)低(di)風速(su)季(ji)節使(shi)用(yong)(yong)(yong)(yong)(yong)。雖然無(wu)(wu)線(xian)(xian)對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)也有著不錯的(de)效果(guo)。但由于(yu)系(xi)統(tong)(tong)(tong)工作(zuo)時(shi)會有一(yi)定的(de)干擾，使(shi)對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)效果(guo)下降，另外在(zai)(zai)信號(hao)(hao)較(jiao)弱時(shi)對(dui)(dui)(dui)(dui)(dui)用(yong)(yong)(yong)(yong)(yong)戶(hu)語(yu)音產(chan)生(sheng)(sheng)了影響。特別(bie)是(shi)(shi)(shi)在(zai)(zai)人員復雜、通(tong)信距離較(jiao)短或需(xu)要(yao)較(jiao)長時(shi)間使(shi)用(yong)(yong)(yong)(yong)(yong)時(shi)。因此，更需(xu)要(yao)有一(yi)個(ge)可(ke)靠的(de)無(wu)(wu)線(xian)(xian)對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)提供與有線(xian)(xian)對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)一(yi)樣的(de)語(yu)音信息與控制。無(wu)(wu)線(xian)(xian)對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)具有很高的(de)靈(ling)活性，它能(neng)夠滿足現場中(zhong)所有環(huan)境使(shi)用(yong)(yong)(yong)(yong)(yong)需(xu)求并能(neng)隨時(shi)切換(huan)（如在(zai)(zai)野(ye)外、戶(hu)外電(dian)話(hua)等),用(yong)(yong)(yong)(yong)(yong)戶(hu)可(ke)以在(zai)(zai)任(ren)何地點使(shi)用(yong)(yong)(yong)(yong)(yong)、隨時(shi)、隨地進行通(tong)訊。使(shi)用(yong)(yong)(yong)(yong)(yong)方便、節省(sheng)成本、節約費用(yong)(yong)(yong)(yong)(yong)。下面(mian)我們(men)來了解一(yi)下無(wu)(wu)線(xian)(xian)對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)它主要(yao)是(shi)(shi)(shi)什么優點？

1.性能穩(wen)定，可(ke)靠性高

在相同無(wu)(wu)(wu)線(xian)(xian)傳輸距離下(xia)，無(wu)(wu)(wu)線(xian)(xian)傳輸信(xin)號更穩(wen)定(ding)(ding)由于使(shi)用了(le)功率放大(da)器(qi)來對(dui)(dui)(dui)無(wu)(wu)(wu)線(xian)(xian)信(xin)號進行壓縮(suo)和(he)放大(da)，使(shi)無(wu)(wu)(wu)線(xian)(xian)信(xin)號更加穩(wen)定(ding)(ding)可(ke)靠。無(wu)(wu)(wu)線(xian)(xian)信(xin)號在弱電磁(ci)(ci)環境(jing)下(xia)也(ye)能(neng)保(bao)(bao)持(chi)較好的(de)(de)性能(neng)。無(wu)(wu)(wu)線(xian)(xian)對(dui)(dui)(dui)講(jiang)系(xi)統具(ju)有(you)發(fa)(fa)射(she)功率小、抗(kang)(kang)千擾(rao)(rao)能(neng)力強(與(yu)(yu)有(you)線(xian)(xian)對(dui)(dui)(dui)講(jiang)系(xi)統比較)和(he)抗(kang)(kang)電磁(ci)(ci)干擾(rao)(rao)能(neng)力強(與(yu)(yu)有(you)線(xian)(xian)對(dui)(dui)(dui)講(jiang)系(xi)統比較)的(de)(de)特(te)點(dian)。無(wu)(wu)(wu)線(xian)(xian)對(dui)(dui)(dui)講(jiang)系(xi)統發(fa)(fa)射(she)信(xin)號在發(fa)(fa)射(she)前和(he)發(fa)(fa)射(she)后(hou)均(jun)能(neng)保(bao)(bao)持(chi)良好的(de)(de)性能(neng)，使(shi)用過程中，發(fa)(fa)射(she)信(xin)號與(yu)(yu)接收信(xin)號完(wan)全不(bu)受任何千擾(rao)(rao)，可(ke)保(bao)(bao)持(chi)很好的(de)(de)穩(wen)定(ding)(ding)性，具(ju)有(you)良好的(de)(de)抗(kang)(kang)千擾(rao)(rao)性和(he)抗(kang)(kang)低頻干擾(rao)(rao)能(neng)力，即使(shi)在惡劣的(de)(de)環境(jing)下(xia)也(ye)能(neng)保(bao)(bao)持(chi)較好的(de)(de)性能(neng)。因此無(wu)(wu)(wu)線(xian)(xian)系(xi)統有(you)較高的(de)(de)可(ke)靠性。

2.功耗小(xiao)、不受天氣(qi)、濕度的(de)影響(xiang)

無(wu)線(xian)對(dui)講系(xi)統(tong)在不同(tong)的(de)環(huan)境(jing)(jing)(jing)中，無(wu)線(xian)通(tong)信設(she)(she)(she)備和有(you)線(xian)通(tong)信設(she)(she)(she)備一(yi)樣(yang)都要進行電(dian)(dian)能的(de)消耗(hao)(hao)。當環(huan)境(jing)(jing)(jing)溫(wen)度在-40°C以下時(shi)(shi)，無(wu)線(xian)通(tong)信設(she)(she)(she)備需要每天工作8小時(shi)(shi)左(zuo)右(you)(you);當環(huan)境(jing)(jing)(jing)溫(wen)度為-20°C時(shi)(shi)，每天工作8小時(shi)(shi)左(zuo)右(you)(you);當環(huan)境(jing)(jing)(jing)溫(wen)度為-30°C時(shi)(shi)，每天工作4小時(shi)(shi)左(zuo)右(you)(you)。目前市場上常(chang)見的(de)無(wu)線(xian)對(dui)講系(xi)統(tong)有(you)兩種(zhong)電(dian)(dian)源(yuan)輸入(ru)方(fang)式(shi)，一(yi)種(zhong)是電(dian)(dian)源(yuan)輸入(ru)，另一(yi)種(zhong)是電(dian)(dian)源(yuan)輸出。從這兩種(zhong)方(fang)式(shi)對(dui)系(xi)統(tong)的(de)功(gong)耗(hao)(hao)來(lai)看(kan)，電(dian)(dian)源(yuan)輸入(ru)方(fang)式(shi)的(de)功(gong)耗(hao)(hao)更大(da)一(yi)些，但是功(gong)耗(hao)(hao)很小。并且設(she)(she)(she)備的(de)工作環(huan)境(jing)(jing)(jing)不同(tong)，對(dui)電(dian)(dian)池(chi)的(de)需求(qiu)量也不同(tong)，所(suo)以功(gong)耗(hao)(hao)也不同(tong)。

3信號不受干擾

在(zai)一(yi)(yi)(yi)些有干(gan)(gan)(gan)擾(rao)的(de)地(di)方(fang)，例(li)如(ru)野外(wai)、機場、工(gong)廠(chang)等，一(yi)(yi)(yi)般(ban)采(cai)(cai)用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)方(fang)式。分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)方(fang)式的(de)抗(kang)(kang)干(gan)(gan)(gan)擾(rao)能(neng)(neng)力不強(qiang)(qiang)(qiang)，其(qi)抗(kang)(kang)干(gan)(gan)(gan)擾(rao)能(neng)(neng)力主要取決(jue)于(yu)射(she)頻(pin)(pin)(pin)(pin)(pin)(pin)功(gong)(gong)率的(de)大小。分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)(shu)的(de)功(gong)(gong)率一(yi)(yi)(yi)般(ban)是(shi)50dB在(zai)50dB左右時，其(qi)抗(kang)(kang)干(gan)(gan)(gan)擾(rao)能(neng)(neng)力強(qiang)(qiang)(qiang)。但由(you)于(yu)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)的(de)干(gan)(gan)(gan)擾(rao)與噪(zao)聲(主要是(shi)周邊噪(zao)聲)具有很強(qiang)(qiang)(qiang)的(de)互通性，當分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)發射(she)的(de)信(xin)(xin)(xin)號(hao)(hao)(hao)超過(guo)50dB時，其(qi)抗(kang)(kang)千擾(rao)能(neng)(neng)力就會減弱。另外(wai)，在(zai)一(yi)(yi)(yi)些有噪(zao)音的(de)環境中(zhong)使(shi)用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)(shu)，會使(shi)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)信(xin)(xin)(xin)號(hao)(hao)(hao)無(wu)(wu)法(fa)到達發射(she)端的(de)接收(shou)機或(huo)者造成(cheng)發射(she)端信(xin)(xin)(xin)號(hao)(hao)(hao)與接收(shou)端信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)糟合而造成(cheng)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)或(huo)干(gan)(gan)(gan)擾(rao)(例(li)如(ru)在(zai)使(shi)用(yong)(yong)室(shi)外(wai)電話時) 。而采(cai)(cai)用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)(shu)的(de)無(wu)(wu)線對講(jiang)系(xi)統(tong)由(you)于(yu)發射(she)功(gong)(gong)率小，分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)后的(de)信(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)(qiang)度(du)比有線對講(jiang)系(xi)統(tong)高很多(在(zai)實際使(shi)用(yong)(yong)中(zhong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)設備一(yi)(yi)(yi)般(ban)可以(yi)將系(xi)統(tong)信(xin)(xin)(xin)號(hao)(hao)(hao)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)到50dB以(yi)上),信(xin)(xin)(xin)號(hao)(hao)(hao)不受干(gan)(gan)(gan)擾(rao)。如(ru)果采(cai)(cai)用(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)(shu)，需要在(zai)較大的(de)回波(bo)功(gong)(gong)率下才能(neng)(neng)實現(xian)信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)工(gong)作(如(ru)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)器發射(she)信(xin)(xin)(xin)號(hao)(hao)(hao)與接收(shou)信(xin)(xin)(xin)號(hao)(hao)(hao)重疊時產生的(de)千擾(rao))和發送信(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)(qiang)度(du)降(jiang)低(同(tong)頻(pin)(pin)(pin)(pin)(pin)(pin)帶內的(de)兩只(zhi)天(tian)線對同(tong)一(yi)(yi)(yi)信(xin)(xin)(xin)道(dao)傳輸的(de)信(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)(qiang)度(du)基(ji)本一(yi)(yi)(yi)致);如(ru)果采(cai)(cai)用(yong)(yong)混響技術(shu)(shu)，則可以(yi)實現(xian)對無(wu)(wu)線信(xin)(xin)(xin)號(hao)(hao)(hao)干(gan)(gan)(gan)擾(rao)的(de)抑制或(huo)降(jiang)低。