由于在(zai)戶外、室內等區域，無(wu)(wu)線(xian)(xian)(xian)對講系(xi)統的(de)(de)信號強(qiang)度較(jiao)(jiao)弱，而且采(cai)用(yong)頻率調制技術（如(ru) MHZ、 NMR、 BSI等）產生的(de)(de)信號傳輸時(shi)(shi)(shi)延大，傳輸距離遠。因(yin)此有(you)線(xian)(xian)(xian)對講系(xi)統不適合(he)在(zai)戶外環(huan)(huan)境使用(yong)，特(te)別是在(zai)冬(dong)天及(ji)低風速季節(jie)(jie)使用(yong)。雖然無(wu)(wu)線(xian)(xian)(xian)對講系(xi)統也有(you)著(zhu)不錯的(de)(de)效(xiao)果。但由于系(xi)統工作(zuo)時(shi)(shi)(shi)會有(you)一定(ding)的(de)(de)干擾，使對講效(xiao)果下(xia)(xia)降，另外在(zai)信號較(jiao)(jiao)弱時(shi)(shi)(shi)對用(yong)戶語(yu)音產生了影響。特(te)別是在(zai)人(ren)員復雜、通(tong)信距離較(jiao)(jiao)短或(huo)需(xu)要較(jiao)(jiao)長時(shi)(shi)(shi)間使用(yong)時(shi)(shi)(shi)。因(yin)此，更需(xu)要有(you)一個可靠的(de)(de)無(wu)(wu)線(xian)(xian)(xian)對講系(xi)統提供與有(you)線(xian)(xian)(xian)對講系(xi)統一樣的(de)(de)語(yu)音信息(xi)與控制。無(wu)(wu)線(xian)(xian)(xian)對講系(xi)統具(ju)有(you)很高的(de)(de)靈活(huo)性，它(ta)能夠滿足現(xian)場中所(suo)有(you)環(huan)(huan)境使用(yong)需(xu)求并能隨時(shi)(shi)(shi)切換（如(ru)在(zai)野外、戶外電話(hua)等),用(yong)戶可以在(zai)任何地點使用(yong)、隨時(shi)(shi)(shi)、隨地進行通(tong)訊。使用(yong)方便、節(jie)(jie)省(sheng)成(cheng)本、節(jie)(jie)約費用(yong)。下(xia)(xia)面我(wo)們來了解(jie)一下(xia)(xia)無(wu)(wu)線(xian)(xian)(xian)對講系(xi)統它(ta)主要是什么優(you)點？

1.性(xing)能穩定，可靠性(xing)高

在(zai)相同無(wu)(wu)線(xian)(xian)(xian)傳輸(shu)距離下，無(wu)(wu)線(xian)(xian)(xian)傳輸(shu)信(xin)(xin)號(hao)(hao)更(geng)穩定(ding)由于使(shi)用了功(gong)率(lv)放大器來對(dui)無(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)(hao)進行壓縮和放大，使(shi)無(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)(hao)更(geng)加穩定(ding)可(ke)靠。無(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)(hao)在(zai)弱(ruo)電磁環境(jing)下也能(neng)(neng)(neng)保(bao)持(chi)較(jiao)好(hao)(hao)的(de)性(xing)(xing)(xing)能(neng)(neng)(neng)。無(wu)(wu)線(xian)(xian)(xian)對(dui)講(jiang)系(xi)統(tong)(tong)(tong)(tong)具有(you)發射功(gong)率(lv)小、抗千擾(rao)能(neng)(neng)(neng)力(li)強(與有(you)線(xian)(xian)(xian)對(dui)講(jiang)系(xi)統(tong)(tong)(tong)(tong)比(bi)較(jiao))和抗電磁干擾(rao)能(neng)(neng)(neng)力(li)強(與有(you)線(xian)(xian)(xian)對(dui)講(jiang)系(xi)統(tong)(tong)(tong)(tong)比(bi)較(jiao))的(de)特點。無(wu)(wu)線(xian)(xian)(xian)對(dui)講(jiang)系(xi)統(tong)(tong)(tong)(tong)發射信(xin)(xin)號(hao)(hao)在(zai)發射前和發射后(hou)均能(neng)(neng)(neng)保(bao)持(chi)良好(hao)(hao)的(de)性(xing)(xing)(xing)能(neng)(neng)(neng)，使(shi)用過程(cheng)中，發射信(xin)(xin)號(hao)(hao)與接收(shou)信(xin)(xin)號(hao)(hao)完全不受任何千擾(rao)，可(ke)保(bao)持(chi)很好(hao)(hao)的(de)穩定(ding)性(xing)(xing)(xing)，具有(you)良好(hao)(hao)的(de)抗千擾(rao)性(xing)(xing)(xing)和抗低頻干擾(rao)能(neng)(neng)(neng)力(li)，即使(shi)在(zai)惡劣的(de)環境(jing)下也能(neng)(neng)(neng)保(bao)持(chi)較(jiao)好(hao)(hao)的(de)性(xing)(xing)(xing)能(neng)(neng)(neng)。因此無(wu)(wu)線(xian)(xian)(xian)系(xi)統(tong)(tong)(tong)(tong)有(you)較(jiao)高的(de)可(ke)靠性(xing)(xing)(xing)。

2.功耗小、不受天氣(qi)、濕度的影響

無線(xian)(xian)對(dui)講系(xi)統(tong)在(zai)不(bu)(bu)(bu)同的(de)環境(jing)中(zhong)，無線(xian)(xian)通(tong)(tong)信(xin)設備(bei)(bei)和有線(xian)(xian)通(tong)(tong)信(xin)設備(bei)(bei)一樣(yang)都要(yao)進行電(dian)能的(de)消耗(hao)(hao)。當(dang)環境(jing)溫度(du)在(zai)-40°C以下時(shi)(shi)，無線(xian)(xian)通(tong)(tong)信(xin)設備(bei)(bei)需要(yao)每(mei)天(tian)工作8小時(shi)(shi)左(zuo)右(you);當(dang)環境(jing)溫度(du)為-20°C時(shi)(shi)，每(mei)天(tian)工作8小時(shi)(shi)左(zuo)右(you);當(dang)環境(jing)溫度(du)為-30°C時(shi)(shi)，每(mei)天(tian)工作4小時(shi)(shi)左(zuo)右(you)。目前市場上常見的(de)無線(xian)(xian)對(dui)講系(xi)統(tong)有兩種電(dian)源輸(shu)(shu)入(ru)方式，一種是(shi)電(dian)源輸(shu)(shu)入(ru)，另一種是(shi)電(dian)源輸(shu)(shu)出。從這兩種方式對(dui)系(xi)統(tong)的(de)功耗(hao)(hao)來看，電(dian)源輸(shu)(shu)入(ru)方式的(de)功耗(hao)(hao)更大一些，但是(shi)功耗(hao)(hao)很小。并且設備(bei)(bei)的(de)工作環境(jing)不(bu)(bu)(bu)同，對(dui)電(dian)池的(de)需求(qiu)量也不(bu)(bu)(bu)同，所以功耗(hao)(hao)也不(bu)(bu)(bu)同。

3信號不受干擾

在一些有干(gan)(gan)(gan)擾(rao)(rao)(rao)的(de)(de)(de)地方(fang)，例(li)如(ru)野外、機場、工(gong)廠(chang)等，一般(ban)采(cai)用(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)方(fang)式。分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)方(fang)式的(de)(de)(de)抗(kang)干(gan)(gan)(gan)擾(rao)(rao)(rao)能(neng)力不強(qiang)，其抗(kang)干(gan)(gan)(gan)擾(rao)(rao)(rao)能(neng)力主要取決(jue)于(yu)射(she)頻(pin)(pin)(pin)(pin)(pin)功(gong)(gong)率的(de)(de)(de)大(da)小。分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)(shu)的(de)(de)(de)功(gong)(gong)率一般(ban)是50dB在50dB左(zuo)右時，其抗(kang)干(gan)(gan)(gan)擾(rao)(rao)(rao)能(neng)力強(qiang)。但由(you)于(yu)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)的(de)(de)(de)干(gan)(gan)(gan)擾(rao)(rao)(rao)與噪(zao)聲(sheng)(主要是周邊噪(zao)聲(sheng))具有很(hen)強(qiang)的(de)(de)(de)互通性，當分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)發射(she)的(de)(de)(de)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)超過50dB時，其抗(kang)千擾(rao)(rao)(rao)能(neng)力就(jiu)會減(jian)弱。另外，在一些有噪(zao)音的(de)(de)(de)環境(jing)中使(shi)用(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)(shu)，會使(shi)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)無(wu)法到達發射(she)端(duan)的(de)(de)(de)接(jie)收(shou)機或(huo)者(zhe)造(zao)成發射(she)端(duan)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)與接(jie)收(shou)端(duan)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)的(de)(de)(de)糟合而(er)造(zao)成分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)或(huo)干(gan)(gan)(gan)擾(rao)(rao)(rao)(例(li)如(ru)在使(shi)用(yong)室外電話時) 。而(er)采(cai)用(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)(shu)的(de)(de)(de)無(wu)線(xian)對講(jiang)系統由(you)于(yu)發射(she)功(gong)(gong)率小，分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)后的(de)(de)(de)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)強(qiang)度比有線(xian)對講(jiang)系統高很(hen)多(在實際使(shi)用(yong)中分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)設備一般(ban)可(ke)(ke)以(yi)將系統信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)到50dB以(yi)上),信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)不受干(gan)(gan)(gan)擾(rao)(rao)(rao)。如(ru)果采(cai)用(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)(shu)，需要在較(jiao)大(da)的(de)(de)(de)回波功(gong)(gong)率下才能(neng)實現信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)的(de)(de)(de)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)工(gong)作(zuo)(如(ru)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)器(qi)發射(she)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)與接(jie)收(shou)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)重疊(die)時產生的(de)(de)(de)千擾(rao)(rao)(rao))和發送信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)強(qiang)度降低(同(tong)頻(pin)(pin)(pin)(pin)(pin)帶內的(de)(de)(de)兩只天(tian)線(xian)對同(tong)一信(xin)(xin)(xin)(xin)(xin)道傳輸的(de)(de)(de)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)強(qiang)度基本一致);如(ru)果采(cai)用(yong)混響技(ji)術(shu)(shu)，則可(ke)(ke)以(yi)實現對無(wu)線(xian)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)干(gan)(gan)(gan)擾(rao)(rao)(rao)的(de)(de)(de)抑制或(huo)降低。