由于(yu)在(zai)戶(hu)外(wai)、室內等(deng)區域，無(wu)(wu)(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)統(tong)(tong)的(de)信(xin)(xin)號(hao)強度較弱，而且(qie)采(cai)用(yong)(yong)頻率調制技術（如 MHZ、 NMR、 BSI等(deng)）產(chan)生(sheng)的(de)信(xin)(xin)號(hao)傳(chuan)輸時(shi)(shi)延大，傳(chuan)輸距(ju)離遠。因(yin)(yin)此有(you)線(xian)對(dui)講(jiang)(jiang)系(xi)統(tong)(tong)不適合在(zai)戶(hu)外(wai)環境使(shi)用(yong)(yong)，特別是(shi)在(zai)冬天(tian)及低風速(su)季節使(shi)用(yong)(yong)。雖(sui)然無(wu)(wu)(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)統(tong)(tong)也有(you)著(zhu)不錯的(de)效果(guo)。但(dan)由于(yu)系(xi)統(tong)(tong)工(gong)作時(shi)(shi)會有(you)一(yi)(yi)定(ding)的(de)干擾(rao)，使(shi)對(dui)講(jiang)(jiang)效果(guo)下降，另外(wai)在(zai)信(xin)(xin)號(hao)較弱時(shi)(shi)對(dui)用(yong)(yong)戶(hu)語(yu)(yu)音產(chan)生(sheng)了影(ying)響。特別是(shi)在(zai)人員復雜、通信(xin)(xin)距(ju)離較短或需(xu)要(yao)較長時(shi)(shi)間使(shi)用(yong)(yong)時(shi)(shi)。因(yin)(yin)此，更(geng)需(xu)要(yao)有(you)一(yi)(yi)個可靠的(de)無(wu)(wu)(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)統(tong)(tong)提(ti)供與有(you)線(xian)對(dui)講(jiang)(jiang)系(xi)統(tong)(tong)一(yi)(yi)樣的(de)語(yu)(yu)音信(xin)(xin)息與控制。無(wu)(wu)(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)統(tong)(tong)具有(you)很高的(de)靈(ling)活性，它能(neng)(neng)夠滿(man)足現場中(zhong)所(suo)有(you)環境使(shi)用(yong)(yong)需(xu)求并能(neng)(neng)隨時(shi)(shi)切換(huan)（如在(zai)野外(wai)、戶(hu)外(wai)電話等(deng)),用(yong)(yong)戶(hu)可以在(zai)任何(he)地(di)點(dian)使(shi)用(yong)(yong)、隨時(shi)(shi)、隨地(di)進行通訊(xun)。使(shi)用(yong)(yong)方(fang)便(bian)、節省成(cheng)本、節約(yue)費用(yong)(yong)。下面我們來了解一(yi)(yi)下無(wu)(wu)(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)統(tong)(tong)它主要(yao)是(shi)什么優(you)點(dian)？

1.性能穩定(ding)，可靠性高

在(zai)相同無(wu)(wu)線(xian)(xian)(xian)(xian)(xian)傳(chuan)(chuan)輸距(ju)離(li)下，無(wu)(wu)線(xian)(xian)(xian)(xian)(xian)傳(chuan)(chuan)輸信(xin)號(hao)更穩(wen)定(ding)(ding)由于使(shi)用了功率放大(da)器來(lai)對無(wu)(wu)線(xian)(xian)(xian)(xian)(xian)信(xin)號(hao)進行壓縮(suo)和(he)放大(da)，使(shi)無(wu)(wu)線(xian)(xian)(xian)(xian)(xian)信(xin)號(hao)更加穩(wen)定(ding)(ding)可靠。無(wu)(wu)線(xian)(xian)(xian)(xian)(xian)信(xin)號(hao)在(zai)弱電磁環(huan)境(jing)下也(ye)能(neng)保(bao)(bao)持較好(hao)(hao)的(de)(de)性(xing)能(neng)。無(wu)(wu)線(xian)(xian)(xian)(xian)(xian)對講系(xi)統(tong)具有(you)發射(she)功率小、抗(kang)千(qian)擾(rao)能(neng)力(li)強(qiang)(與有(you)線(xian)(xian)(xian)(xian)(xian)對講系(xi)統(tong)比較)和(he)抗(kang)電磁干(gan)擾(rao)能(neng)力(li)強(qiang)(與有(you)線(xian)(xian)(xian)(xian)(xian)對講系(xi)統(tong)比較)的(de)(de)特點。無(wu)(wu)線(xian)(xian)(xian)(xian)(xian)對講系(xi)統(tong)發射(she)信(xin)號(hao)在(zai)發射(she)前和(he)發射(she)后均能(neng)保(bao)(bao)持良好(hao)(hao)的(de)(de)性(xing)能(neng)，使(shi)用過(guo)程中，發射(she)信(xin)號(hao)與接收信(xin)號(hao)完全(quan)不受任何(he)千(qian)擾(rao)，可保(bao)(bao)持很好(hao)(hao)的(de)(de)穩(wen)定(ding)(ding)性(xing)，具有(you)良好(hao)(hao)的(de)(de)抗(kang)千(qian)擾(rao)性(xing)和(he)抗(kang)低頻干(gan)擾(rao)能(neng)力(li)，即使(shi)在(zai)惡劣(lie)的(de)(de)環(huan)境(jing)下也(ye)能(neng)保(bao)(bao)持較好(hao)(hao)的(de)(de)性(xing)能(neng)。因此無(wu)(wu)線(xian)(xian)(xian)(xian)(xian)系(xi)統(tong)有(you)較高的(de)(de)可靠性(xing)。

2.功耗小、不受(shou)天氣、濕(shi)度的影響

無線(xian)(xian)對(dui)講(jiang)系統在(zai)不同(tong)的(de)(de)(de)(de)環(huan)境(jing)(jing)(jing)中，無線(xian)(xian)通(tong)信(xin)設(she)備(bei)和(he)有線(xian)(xian)通(tong)信(xin)設(she)備(bei)一樣都要進(jin)行電(dian)(dian)(dian)能的(de)(de)(de)(de)消耗(hao)。當環(huan)境(jing)(jing)(jing)溫(wen)(wen)度在(zai)-40°C以下時(shi)(shi)，無線(xian)(xian)通(tong)信(xin)設(she)備(bei)需(xu)要每(mei)天(tian)工作(zuo)8小時(shi)(shi)左(zuo)(zuo)右(you);當環(huan)境(jing)(jing)(jing)溫(wen)(wen)度為(wei)-20°C時(shi)(shi)，每(mei)天(tian)工作(zuo)8小時(shi)(shi)左(zuo)(zuo)右(you);當環(huan)境(jing)(jing)(jing)溫(wen)(wen)度為(wei)-30°C時(shi)(shi)，每(mei)天(tian)工作(zuo)4小時(shi)(shi)左(zuo)(zuo)右(you)。目前市場上常見(jian)的(de)(de)(de)(de)無線(xian)(xian)對(dui)講(jiang)系統有兩種(zhong)(zhong)電(dian)(dian)(dian)源(yuan)(yuan)輸(shu)(shu)入方式(shi)(shi)，一種(zhong)(zhong)是(shi)電(dian)(dian)(dian)源(yuan)(yuan)輸(shu)(shu)入，另一種(zhong)(zhong)是(shi)電(dian)(dian)(dian)源(yuan)(yuan)輸(shu)(shu)出。從這兩種(zhong)(zhong)方式(shi)(shi)對(dui)系統的(de)(de)(de)(de)功耗(hao)來(lai)看，電(dian)(dian)(dian)源(yuan)(yuan)輸(shu)(shu)入方式(shi)(shi)的(de)(de)(de)(de)功耗(hao)更(geng)大一些，但是(shi)功耗(hao)很小。并(bing)且設(she)備(bei)的(de)(de)(de)(de)工作(zuo)環(huan)境(jing)(jing)(jing)不同(tong)，對(dui)電(dian)(dian)(dian)池的(de)(de)(de)(de)需(xu)求量也不同(tong)，所以功耗(hao)也不同(tong)。

3信號不受干擾

在(zai)一(yi)(yi)(yi)些有(you)干(gan)(gan)擾(rao)(rao)(rao)的(de)(de)(de)(de)地(di)方(fang)，例(li)如(ru)(ru)野外(wai)、機場(chang)、工(gong)廠等，一(yi)(yi)(yi)般(ban)采(cai)用(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)方(fang)式。分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)方(fang)式的(de)(de)(de)(de)抗(kang)干(gan)(gan)擾(rao)(rao)(rao)能力(li)不強(qiang)，其(qi)(qi)抗(kang)干(gan)(gan)擾(rao)(rao)(rao)能力(li)主要取(qu)決于(yu)射(she)(she)頻(pin)(pin)(pin)(pin)功(gong)率(lv)的(de)(de)(de)(de)大小。分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技術的(de)(de)(de)(de)功(gong)率(lv)一(yi)(yi)(yi)般(ban)是50dB在(zai)50dB左右(you)時，其(qi)(qi)抗(kang)干(gan)(gan)擾(rao)(rao)(rao)能力(li)強(qiang)。但由于(yu)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)的(de)(de)(de)(de)干(gan)(gan)擾(rao)(rao)(rao)與噪(zao)(zao)聲(主要是周邊噪(zao)(zao)聲)具有(you)很強(qiang)的(de)(de)(de)(de)互通性(xing)，當分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)發(fa)射(she)(she)的(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)超過50dB時，其(qi)(qi)抗(kang)千擾(rao)(rao)(rao)能力(li)就會(hui)減(jian)弱(ruo)。另(ling)外(wai)，在(zai)一(yi)(yi)(yi)些有(you)噪(zao)(zao)音的(de)(de)(de)(de)環(huan)境中使(shi)用(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技術，會(hui)使(shi)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)信(xin)(xin)(xin)號(hao)(hao)(hao)無(wu)法(fa)到達發(fa)射(she)(she)端的(de)(de)(de)(de)接(jie)收機或(huo)者造(zao)成發(fa)射(she)(she)端信(xin)(xin)(xin)號(hao)(hao)(hao)與接(jie)收端信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)糟(zao)合而造(zao)成分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)或(huo)干(gan)(gan)擾(rao)(rao)(rao)(例(li)如(ru)(ru)在(zai)使(shi)用(yong)室外(wai)電(dian)話時) 。而采(cai)用(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技術的(de)(de)(de)(de)無(wu)線(xian)對(dui)講系統由于(yu)發(fa)射(she)(she)功(gong)率(lv)小，分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)后的(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)度(du)比(bi)有(you)線(xian)對(dui)講系統高很多(在(zai)實際使(shi)用(yong)中分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)設備一(yi)(yi)(yi)般(ban)可以(yi)將系統信(xin)(xin)(xin)號(hao)(hao)(hao)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)到50dB以(yi)上),信(xin)(xin)(xin)號(hao)(hao)(hao)不受干(gan)(gan)擾(rao)(rao)(rao)。如(ru)(ru)果采(cai)用(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技術，需要在(zai)較大的(de)(de)(de)(de)回波功(gong)率(lv)下才能實現信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)工(gong)作(如(ru)(ru)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)器發(fa)射(she)(she)信(xin)(xin)(xin)號(hao)(hao)(hao)與接(jie)收信(xin)(xin)(xin)號(hao)(hao)(hao)重(zhong)疊時產生的(de)(de)(de)(de)千擾(rao)(rao)(rao))和發(fa)送信(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)度(du)降(jiang)(jiang)低(di)(同(tong)頻(pin)(pin)(pin)(pin)帶內的(de)(de)(de)(de)兩只天線(xian)對(dui)同(tong)一(yi)(yi)(yi)信(xin)(xin)(xin)道傳輸的(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)度(du)基本一(yi)(yi)(yi)致);如(ru)(ru)果采(cai)用(yong)混響技術，則可以(yi)實現對(dui)無(wu)線(xian)信(xin)(xin)(xin)號(hao)(hao)(hao)干(gan)(gan)擾(rao)(rao)(rao)的(de)(de)(de)(de)抑制或(huo)降(jiang)(jiang)低(di)。