由于在(zai)(zai)(zai)戶外、室內等區域(yu)，無線(xian)(xian)對(dui)(dui)講(jiang)系統(tong)(tong)的信(xin)(xin)(xin)號強度較(jiao)弱(ruo)，而(er)且(qie)采用(yong)(yong)頻率調制(zhi)技術（如(ru) MHZ、 NMR、 BSI等）產生(sheng)的信(xin)(xin)(xin)號傳輸時(shi)延大，傳輸距離(li)(li)遠(yuan)。因(yin)此(ci)有(you)線(xian)(xian)對(dui)(dui)講(jiang)系統(tong)(tong)不適(shi)合在(zai)(zai)(zai)戶外環境使(shi)(shi)用(yong)(yong)，特(te)別是(shi)在(zai)(zai)(zai)冬天及低(di)風速季節(jie)使(shi)(shi)用(yong)(yong)。雖然無線(xian)(xian)對(dui)(dui)講(jiang)系統(tong)(tong)也有(you)著不錯的效果(guo)。但由于系統(tong)(tong)工作時(shi)會有(you)一(yi)定(ding)的干(gan)擾，使(shi)(shi)對(dui)(dui)講(jiang)效果(guo)下降，另外在(zai)(zai)(zai)信(xin)(xin)(xin)號較(jiao)弱(ruo)時(shi)對(dui)(dui)用(yong)(yong)戶語(yu)音產生(sheng)了影響。特(te)別是(shi)在(zai)(zai)(zai)人(ren)員復雜、通(tong)信(xin)(xin)(xin)距離(li)(li)較(jiao)短或(huo)需(xu)要較(jiao)長時(shi)間使(shi)(shi)用(yong)(yong)時(shi)。因(yin)此(ci)，更(geng)需(xu)要有(you)一(yi)個可(ke)靠的無線(xian)(xian)對(dui)(dui)講(jiang)系統(tong)(tong)提供與(yu)有(you)線(xian)(xian)對(dui)(dui)講(jiang)系統(tong)(tong)一(yi)樣的語(yu)音信(xin)(xin)(xin)息(xi)與(yu)控制(zhi)。無線(xian)(xian)對(dui)(dui)講(jiang)系統(tong)(tong)具有(you)很高的靈活性，它能(neng)(neng)夠滿足現(xian)場中所有(you)環境使(shi)(shi)用(yong)(yong)需(xu)求并能(neng)(neng)隨時(shi)切換（如(ru)在(zai)(zai)(zai)野外、戶外電話(hua)等),用(yong)(yong)戶可(ke)以在(zai)(zai)(zai)任何地(di)點使(shi)(shi)用(yong)(yong)、隨時(shi)、隨地(di)進行(xing)通(tong)訊(xun)。使(shi)(shi)用(yong)(yong)方便、節(jie)省成本、節(jie)約費用(yong)(yong)。下面我們來了解一(yi)下無線(xian)(xian)對(dui)(dui)講(jiang)系統(tong)(tong)它主要是(shi)什么優(you)點？

1.性(xing)能(neng)穩(wen)定，可靠性(xing)高(gao)

在(zai)相同無(wu)(wu)線(xian)(xian)傳(chuan)(chuan)輸(shu)距離下(xia)(xia)，無(wu)(wu)線(xian)(xian)傳(chuan)(chuan)輸(shu)信(xin)(xin)號(hao)(hao)(hao)更(geng)穩(wen)定由于使(shi)用了功率(lv)放大器來對(dui)無(wu)(wu)線(xian)(xian)信(xin)(xin)號(hao)(hao)(hao)進行壓(ya)縮和(he)(he)(he)放大，使(shi)無(wu)(wu)線(xian)(xian)信(xin)(xin)號(hao)(hao)(hao)更(geng)加(jia)穩(wen)定可(ke)靠(kao)。無(wu)(wu)線(xian)(xian)信(xin)(xin)號(hao)(hao)(hao)在(zai)弱(ruo)電磁(ci)環境(jing)下(xia)(xia)也能(neng)(neng)保(bao)(bao)持(chi)較(jiao)(jiao)好的(de)(de)(de)性能(neng)(neng)。無(wu)(wu)線(xian)(xian)對(dui)講系(xi)統(tong)(tong)具(ju)有(you)(you)發射(she)功率(lv)小、抗(kang)(kang)千(qian)擾(rao)能(neng)(neng)力強(與(yu)有(you)(you)線(xian)(xian)對(dui)講系(xi)統(tong)(tong)比(bi)(bi)較(jiao)(jiao))和(he)(he)(he)抗(kang)(kang)電磁(ci)干擾(rao)能(neng)(neng)力強(與(yu)有(you)(you)線(xian)(xian)對(dui)講系(xi)統(tong)(tong)比(bi)(bi)較(jiao)(jiao))的(de)(de)(de)特點。無(wu)(wu)線(xian)(xian)對(dui)講系(xi)統(tong)(tong)發射(she)信(xin)(xin)號(hao)(hao)(hao)在(zai)發射(she)前和(he)(he)(he)發射(she)后(hou)均能(neng)(neng)保(bao)(bao)持(chi)良好的(de)(de)(de)性能(neng)(neng)，使(shi)用過程中(zhong)，發射(she)信(xin)(xin)號(hao)(hao)(hao)與(yu)接收信(xin)(xin)號(hao)(hao)(hao)完全不(bu)受任何千(qian)擾(rao)，可(ke)保(bao)(bao)持(chi)很好的(de)(de)(de)穩(wen)定性，具(ju)有(you)(you)良好的(de)(de)(de)抗(kang)(kang)千(qian)擾(rao)性和(he)(he)(he)抗(kang)(kang)低頻干擾(rao)能(neng)(neng)力，即使(shi)在(zai)惡劣的(de)(de)(de)環境(jing)下(xia)(xia)也能(neng)(neng)保(bao)(bao)持(chi)較(jiao)(jiao)好的(de)(de)(de)性能(neng)(neng)。因此無(wu)(wu)線(xian)(xian)系(xi)統(tong)(tong)有(you)(you)較(jiao)(jiao)高的(de)(de)(de)可(ke)靠(kao)性。

2.功耗(hao)小、不受(shou)天氣、濕度的(de)影響

無線(xian)(xian)(xian)對講系統在不(bu)同的(de)(de)(de)(de)環(huan)境(jing)中，無線(xian)(xian)(xian)通(tong)信設(she)備(bei)和有線(xian)(xian)(xian)通(tong)信設(she)備(bei)一(yi)樣都要進行(xing)電(dian)(dian)(dian)能(neng)的(de)(de)(de)(de)消耗(hao)。當(dang)環(huan)境(jing)溫度在-40°C以(yi)下時(shi)(shi)，無線(xian)(xian)(xian)通(tong)信設(she)備(bei)需要每天工(gong)作(zuo)8小(xiao)時(shi)(shi)左右(you);當(dang)環(huan)境(jing)溫度為-20°C時(shi)(shi)，每天工(gong)作(zuo)8小(xiao)時(shi)(shi)左右(you);當(dang)環(huan)境(jing)溫度為-30°C時(shi)(shi)，每天工(gong)作(zuo)4小(xiao)時(shi)(shi)左右(you)。目前(qian)市場(chang)上常(chang)見的(de)(de)(de)(de)無線(xian)(xian)(xian)對講系統有兩種(zhong)電(dian)(dian)(dian)源輸(shu)入(ru)方(fang)式，一(yi)種(zhong)是電(dian)(dian)(dian)源輸(shu)入(ru)，另一(yi)種(zhong)是電(dian)(dian)(dian)源輸(shu)出(chu)。從這兩種(zhong)方(fang)式對系統的(de)(de)(de)(de)功(gong)耗(hao)來看(kan)，電(dian)(dian)(dian)源輸(shu)入(ru)方(fang)式的(de)(de)(de)(de)功(gong)耗(hao)更大一(yi)些，但是功(gong)耗(hao)很(hen)小(xiao)。并且設(she)備(bei)的(de)(de)(de)(de)工(gong)作(zuo)環(huan)境(jing)不(bu)同，對電(dian)(dian)(dian)池的(de)(de)(de)(de)需求量也不(bu)同，所以(yi)功(gong)耗(hao)也不(bu)同。

3信號不受干擾

在(zai)一些有(you)干(gan)(gan)(gan)擾(rao)的(de)(de)地方(fang)，例如野外(wai)(wai)、機(ji)場、工廠等，一般采用(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)方(fang)式。分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)方(fang)式的(de)(de)抗(kang)(kang)干(gan)(gan)(gan)擾(rao)能(neng)力(li)(li)不強(qiang)，其(qi)抗(kang)(kang)干(gan)(gan)(gan)擾(rao)能(neng)力(li)(li)主要取決(jue)于射頻(pin)(pin)(pin)(pin)(pin)(pin)功(gong)(gong)率(lv)的(de)(de)大(da)小。分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技(ji)(ji)術(shu)(shu)的(de)(de)功(gong)(gong)率(lv)一般是(shi)50dB在(zai)50dB左右(you)時(shi)(shi)，其(qi)抗(kang)(kang)干(gan)(gan)(gan)擾(rao)能(neng)力(li)(li)強(qiang)。但由于分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)的(de)(de)干(gan)(gan)(gan)擾(rao)與(yu)噪(zao)聲(主要是(shi)周邊噪(zao)聲)具(ju)有(you)很強(qiang)的(de)(de)互通性，當分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)發(fa)(fa)射的(de)(de)信(xin)(xin)號(hao)(hao)(hao)超過50dB時(shi)(shi)，其(qi)抗(kang)(kang)千(qian)擾(rao)能(neng)力(li)(li)就會減(jian)弱。另(ling)外(wai)(wai)，在(zai)一些有(you)噪(zao)音(yin)的(de)(de)環境中使(shi)用(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技(ji)(ji)術(shu)(shu)，會使(shi)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)信(xin)(xin)號(hao)(hao)(hao)無法(fa)到(dao)達(da)發(fa)(fa)射端的(de)(de)接收機(ji)或(huo)者造成發(fa)(fa)射端信(xin)(xin)號(hao)(hao)(hao)與(yu)接收端信(xin)(xin)號(hao)(hao)(hao)的(de)(de)糟(zao)合(he)而造成分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)或(huo)干(gan)(gan)(gan)擾(rao)(例如在(zai)使(shi)用(yong)室外(wai)(wai)電話時(shi)(shi)) 。而采用(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技(ji)(ji)術(shu)(shu)的(de)(de)無線(xian)對(dui)講系(xi)(xi)統由于發(fa)(fa)射功(gong)(gong)率(lv)小，分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)后(hou)的(de)(de)信(xin)(xin)號(hao)(hao)(hao)強(qiang)度比有(you)線(xian)對(dui)講系(xi)(xi)統高很多(在(zai)實(shi)際使(shi)用(yong)中分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)設備一般可以將系(xi)(xi)統信(xin)(xin)號(hao)(hao)(hao)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)到(dao)50dB以上),信(xin)(xin)號(hao)(hao)(hao)不受干(gan)(gan)(gan)擾(rao)。如果采用(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技(ji)(ji)術(shu)(shu)，需要在(zai)較大(da)的(de)(de)回波功(gong)(gong)率(lv)下才能(neng)實(shi)現信(xin)(xin)號(hao)(hao)(hao)的(de)(de)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)工作(如分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)器發(fa)(fa)射信(xin)(xin)號(hao)(hao)(hao)與(yu)接收信(xin)(xin)號(hao)(hao)(hao)重疊(die)時(shi)(shi)產生的(de)(de)千(qian)擾(rao))和發(fa)(fa)送信(xin)(xin)號(hao)(hao)(hao)強(qiang)度降(jiang)低(di)(同頻(pin)(pin)(pin)(pin)(pin)(pin)帶內的(de)(de)兩只天線(xian)對(dui)同一信(xin)(xin)道傳(chuan)輸的(de)(de)信(xin)(xin)號(hao)(hao)(hao)強(qiang)度基本一致);如果采用(yong)混響技(ji)(ji)術(shu)(shu)，則可以實(shi)現對(dui)無線(xian)信(xin)(xin)號(hao)(hao)(hao)干(gan)(gan)(gan)擾(rao)的(de)(de)抑(yi)制或(huo)降(jiang)低(di)。