由于(yu)在(zai)(zai)戶外(wai)、室內等區域，無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)(jiang)系(xi)統的(de)信(xin)號(hao)強度(du)較(jiao)弱(ruo)，而且采用(yong)(yong)(yong)頻率調制(zhi)技術（如(ru) MHZ、 NMR、 BSI等）產生的(de)信(xin)號(hao)傳輸(shu)時(shi)(shi)(shi)延大，傳輸(shu)距離(li)遠。因(yin)此有(you)線(xian)(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)(jiang)系(xi)統不(bu)(bu)適(shi)合在(zai)(zai)戶外(wai)環(huan)境使(shi)用(yong)(yong)(yong)，特別是(shi)在(zai)(zai)冬天及低風速季節(jie)使(shi)用(yong)(yong)(yong)。雖(sui)然無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)(jiang)系(xi)統也有(you)著(zhu)不(bu)(bu)錯的(de)效果。但由于(yu)系(xi)統工作時(shi)(shi)(shi)會有(you)一定的(de)干(gan)擾，使(shi)對(dui)(dui)(dui)(dui)講(jiang)(jiang)(jiang)效果下(xia)降，另外(wai)在(zai)(zai)信(xin)號(hao)較(jiao)弱(ruo)時(shi)(shi)(shi)對(dui)(dui)(dui)(dui)用(yong)(yong)(yong)戶語音產生了(le)影響。特別是(shi)在(zai)(zai)人(ren)員復雜、通信(xin)距離(li)較(jiao)短或需要(yao)較(jiao)長時(shi)(shi)(shi)間(jian)使(shi)用(yong)(yong)(yong)時(shi)(shi)(shi)。因(yin)此，更需要(yao)有(you)一個可(ke)靠的(de)無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)(jiang)系(xi)統提供與有(you)線(xian)(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)(jiang)系(xi)統一樣的(de)語音信(xin)息與控制(zhi)。無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)(jiang)系(xi)統具有(you)很高的(de)靈活性，它能夠滿足現場中(zhong)所有(you)環(huan)境使(shi)用(yong)(yong)(yong)需求并(bing)能隨(sui)時(shi)(shi)(shi)切(qie)換（如(ru)在(zai)(zai)野外(wai)、戶外(wai)電話等),用(yong)(yong)(yong)戶可(ke)以在(zai)(zai)任何地點使(shi)用(yong)(yong)(yong)、隨(sui)時(shi)(shi)(shi)、隨(sui)地進行通訊。使(shi)用(yong)(yong)(yong)方便、節(jie)省成本、節(jie)約(yue)費用(yong)(yong)(yong)。下(xia)面我(wo)們來了(le)解一下(xia)無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)(jiang)系(xi)統它主要(yao)是(shi)什(shen)么優(you)點？

1.性能穩定(ding)，可靠(kao)性高

在(zai)相同無(wu)(wu)(wu)(wu)線(xian)(xian)(xian)傳輸(shu)距離下，無(wu)(wu)(wu)(wu)線(xian)(xian)(xian)傳輸(shu)信(xin)號(hao)(hao)更穩(wen)定由于使(shi)用了功(gong)率(lv)放(fang)大(da)器(qi)來對(dui)無(wu)(wu)(wu)(wu)線(xian)(xian)(xian)信(xin)號(hao)(hao)進行壓縮和放(fang)大(da)，使(shi)無(wu)(wu)(wu)(wu)線(xian)(xian)(xian)信(xin)號(hao)(hao)更加穩(wen)定可靠。無(wu)(wu)(wu)(wu)線(xian)(xian)(xian)信(xin)號(hao)(hao)在(zai)弱電磁環境下也(ye)能保(bao)持(chi)較(jiao)(jiao)好(hao)(hao)的性(xing)能。無(wu)(wu)(wu)(wu)線(xian)(xian)(xian)對(dui)講系(xi)統(tong)(tong)具(ju)有(you)發(fa)射功(gong)率(lv)小(xiao)、抗(kang)千(qian)(qian)擾(rao)能力(li)(li)強(與(yu)有(you)線(xian)(xian)(xian)對(dui)講系(xi)統(tong)(tong)比較(jiao)(jiao))和抗(kang)電磁干(gan)(gan)擾(rao)能力(li)(li)強(與(yu)有(you)線(xian)(xian)(xian)對(dui)講系(xi)統(tong)(tong)比較(jiao)(jiao))的特點(dian)。無(wu)(wu)(wu)(wu)線(xian)(xian)(xian)對(dui)講系(xi)統(tong)(tong)發(fa)射信(xin)號(hao)(hao)在(zai)發(fa)射前和發(fa)射后均能保(bao)持(chi)良(liang)好(hao)(hao)的性(xing)能，使(shi)用過程中，發(fa)射信(xin)號(hao)(hao)與(yu)接收信(xin)號(hao)(hao)完(wan)全不受任何千(qian)(qian)擾(rao)，可保(bao)持(chi)很好(hao)(hao)的穩(wen)定性(xing)，具(ju)有(you)良(liang)好(hao)(hao)的抗(kang)千(qian)(qian)擾(rao)性(xing)和抗(kang)低頻(pin)干(gan)(gan)擾(rao)能力(li)(li)，即使(shi)在(zai)惡劣的環境下也(ye)能保(bao)持(chi)較(jiao)(jiao)好(hao)(hao)的性(xing)能。因(yin)此無(wu)(wu)(wu)(wu)線(xian)(xian)(xian)系(xi)統(tong)(tong)有(you)較(jiao)(jiao)高的可靠性(xing)。

2.功耗(hao)小、不受天氣、濕度的影響

無(wu)線(xian)對(dui)講系統在不(bu)(bu)同的(de)(de)環境中，無(wu)線(xian)通信設備(bei)(bei)和有線(xian)通信設備(bei)(bei)一樣都要(yao)進(jin)行電(dian)能的(de)(de)消耗(hao)(hao)。當環境溫度在-40°C以(yi)下時(shi)(shi)(shi)，無(wu)線(xian)通信設備(bei)(bei)需要(yao)每天工(gong)作8小(xiao)時(shi)(shi)(shi)左右;當環境溫度為(wei)-20°C時(shi)(shi)(shi)，每天工(gong)作8小(xiao)時(shi)(shi)(shi)左右;當環境溫度為(wei)-30°C時(shi)(shi)(shi)，每天工(gong)作4小(xiao)時(shi)(shi)(shi)左右。目前市場(chang)上常見的(de)(de)無(wu)線(xian)對(dui)講系統有兩種(zhong)電(dian)源(yuan)輸(shu)入(ru)方(fang)(fang)式，一種(zhong)是電(dian)源(yuan)輸(shu)入(ru)，另一種(zhong)是電(dian)源(yuan)輸(shu)出(chu)。從這兩種(zhong)方(fang)(fang)式對(dui)系統的(de)(de)功(gong)(gong)耗(hao)(hao)來(lai)看(kan)，電(dian)源(yuan)輸(shu)入(ru)方(fang)(fang)式的(de)(de)功(gong)(gong)耗(hao)(hao)更大(da)一些(xie)，但(dan)是功(gong)(gong)耗(hao)(hao)很小(xiao)。并且設備(bei)(bei)的(de)(de)工(gong)作環境不(bu)(bu)同，對(dui)電(dian)池(chi)的(de)(de)需求量也(ye)不(bu)(bu)同，所以(yi)功(gong)(gong)耗(hao)(hao)也(ye)不(bu)(bu)同。

3信號不受干擾

在(zai)(zai)(zai)一(yi)(yi)(yi)(yi)些有(you)干(gan)擾(rao)的(de)(de)(de)(de)(de)地方，例如野外、機場、工廠等，一(yi)(yi)(yi)(yi)般采(cai)用(yong)(yong)分(fen)頻(pin)(pin)方式。分(fen)頻(pin)(pin)方式的(de)(de)(de)(de)(de)抗干(gan)擾(rao)能(neng)力不(bu)強(qiang)，其抗干(gan)擾(rao)能(neng)力主(zhu)(zhu)要(yao)取決于射頻(pin)(pin)功率(lv)(lv)的(de)(de)(de)(de)(de)大小。分(fen)頻(pin)(pin)技術(shu)(shu)的(de)(de)(de)(de)(de)功率(lv)(lv)一(yi)(yi)(yi)(yi)般是50dB在(zai)(zai)(zai)50dB左右時，其抗干(gan)擾(rao)能(neng)力強(qiang)。但(dan)由于分(fen)頻(pin)(pin)的(de)(de)(de)(de)(de)干(gan)擾(rao)與(yu)噪聲(主(zhu)(zhu)要(yao)是周邊(bian)噪聲)具有(you)很(hen)強(qiang)的(de)(de)(de)(de)(de)互通性，當分(fen)頻(pin)(pin)發射的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)超過50dB時，其抗千擾(rao)能(neng)力就會減弱。另外，在(zai)(zai)(zai)一(yi)(yi)(yi)(yi)些有(you)噪音(yin)的(de)(de)(de)(de)(de)環境中使(shi)(shi)用(yong)(yong)分(fen)頻(pin)(pin)技術(shu)(shu)，會使(shi)(shi)分(fen)頻(pin)(pin)信(xin)(xin)(xin)(xin)號(hao)(hao)無(wu)法到達發射端的(de)(de)(de)(de)(de)接(jie)收機或者造(zao)成發射端信(xin)(xin)(xin)(xin)號(hao)(hao)與(yu)接(jie)收端信(xin)(xin)(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)(de)糟合而造(zao)成分(fen)頻(pin)(pin)或干(gan)擾(rao)(例如在(zai)(zai)(zai)使(shi)(shi)用(yong)(yong)室外電話(hua)時) 。而采(cai)用(yong)(yong)分(fen)頻(pin)(pin)技術(shu)(shu)的(de)(de)(de)(de)(de)無(wu)線對講(jiang)系統由于發射功率(lv)(lv)小，分(fen)頻(pin)(pin)后的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)強(qiang)度(du)(du)比有(you)線對講(jiang)系統高很(hen)多(在(zai)(zai)(zai)實際使(shi)(shi)用(yong)(yong)中分(fen)頻(pin)(pin)設備一(yi)(yi)(yi)(yi)般可以將系統信(xin)(xin)(xin)(xin)號(hao)(hao)分(fen)頻(pin)(pin)到50dB以上),信(xin)(xin)(xin)(xin)號(hao)(hao)不(bu)受干(gan)擾(rao)。如果采(cai)用(yong)(yong)分(fen)頻(pin)(pin)技術(shu)(shu)，需要(yao)在(zai)(zai)(zai)較大的(de)(de)(de)(de)(de)回(hui)波(bo)功率(lv)(lv)下(xia)才能(neng)實現(xian)信(xin)(xin)(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)(de)分(fen)頻(pin)(pin)工作(如分(fen)頻(pin)(pin)器發射信(xin)(xin)(xin)(xin)號(hao)(hao)與(yu)接(jie)收信(xin)(xin)(xin)(xin)號(hao)(hao)重疊時產生(sheng)的(de)(de)(de)(de)(de)千擾(rao))和發送信(xin)(xin)(xin)(xin)號(hao)(hao)強(qiang)度(du)(du)降低(同(tong)頻(pin)(pin)帶內的(de)(de)(de)(de)(de)兩只天線對同(tong)一(yi)(yi)(yi)(yi)信(xin)(xin)(xin)(xin)道(dao)傳輸的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)強(qiang)度(du)(du)基(ji)本一(yi)(yi)(yi)(yi)致);如果采(cai)用(yong)(yong)混響技術(shu)(shu)，則可以實現(xian)對無(wu)線信(xin)(xin)(xin)(xin)號(hao)(hao)干(gan)擾(rao)的(de)(de)(de)(de)(de)抑制或降低。