由(you)于在(zai)戶(hu)外(wai)(wai)、室內等(deng)(deng)區域，無(wu)線(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)(xi)統(tong)的(de)信號(hao)(hao)強(qiang)度較(jiao)(jiao)弱，而且采用(yong)(yong)(yong)頻率調(diao)制(zhi)技術（如(ru) MHZ、 NMR、 BSI等(deng)(deng)）產(chan)生(sheng)(sheng)的(de)信號(hao)(hao)傳(chuan)輸時(shi)(shi)(shi)延大，傳(chuan)輸距(ju)離遠(yuan)。因此有(you)(you)線(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)(xi)統(tong)不(bu)適合(he)在(zai)戶(hu)外(wai)(wai)環(huan)境(jing)使用(yong)(yong)(yong)，特別是(shi)(shi)在(zai)冬(dong)天及低(di)風速季節(jie)使用(yong)(yong)(yong)。雖然無(wu)線(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)(xi)統(tong)也有(you)(you)著(zhu)不(bu)錯的(de)效果(guo)。但由(you)于系(xi)(xi)(xi)(xi)統(tong)工(gong)作(zuo)時(shi)(shi)(shi)會有(you)(you)一(yi)定(ding)的(de)干擾，使對(dui)(dui)講(jiang)(jiang)效果(guo)下降，另外(wai)(wai)在(zai)信號(hao)(hao)較(jiao)(jiao)弱時(shi)(shi)(shi)對(dui)(dui)用(yong)(yong)(yong)戶(hu)語(yu)音產(chan)生(sheng)(sheng)了影響。特別是(shi)(shi)在(zai)人員復(fu)雜、通信距(ju)離較(jiao)(jiao)短或需(xu)(xu)要較(jiao)(jiao)長時(shi)(shi)(shi)間使用(yong)(yong)(yong)時(shi)(shi)(shi)。因此，更需(xu)(xu)要有(you)(you)一(yi)個(ge)可(ke)靠的(de)無(wu)線(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)(xi)統(tong)提供與有(you)(you)線(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)(xi)統(tong)一(yi)樣的(de)語(yu)音信息與控制(zhi)。無(wu)線(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)(xi)統(tong)具(ju)有(you)(you)很高(gao)的(de)靈(ling)活性，它(ta)能夠滿足現場中所(suo)有(you)(you)環(huan)境(jing)使用(yong)(yong)(yong)需(xu)(xu)求并(bing)能隨時(shi)(shi)(shi)切(qie)換(huan)（如(ru)在(zai)野外(wai)(wai)、戶(hu)外(wai)(wai)電話(hua)等(deng)(deng)),用(yong)(yong)(yong)戶(hu)可(ke)以在(zai)任何地點使用(yong)(yong)(yong)、隨時(shi)(shi)(shi)、隨地進行(xing)通訊。使用(yong)(yong)(yong)方便(bian)、節(jie)省成本、節(jie)約費用(yong)(yong)(yong)。下面我們來了解一(yi)下無(wu)線(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)(xi)統(tong)它(ta)主(zhu)要是(shi)(shi)什么(me)優點？

1.性能穩定，可靠性高(gao)

在(zai)相同無線(xian)傳輸(shu)距離(li)下，無線(xian)傳輸(shu)信(xin)(xin)(xin)號(hao)更(geng)穩(wen)(wen)(wen)定由于使(shi)用了功率(lv)放大(da)器來對無線(xian)信(xin)(xin)(xin)號(hao)進(jin)行(xing)壓(ya)縮和放大(da)，使(shi)無線(xian)信(xin)(xin)(xin)號(hao)更(geng)加(jia)穩(wen)(wen)(wen)定可靠(kao)。無線(xian)信(xin)(xin)(xin)號(hao)在(zai)弱(ruo)電磁環境下也能(neng)(neng)保持(chi)(chi)較(jiao)(jiao)好的(de)性(xing)能(neng)(neng)。無線(xian)對講(jiang)(jiang)系(xi)統(tong)(tong)具(ju)有(you)(you)(you)發(fa)射功率(lv)小(xiao)、抗千(qian)擾能(neng)(neng)力強(與有(you)(you)(you)線(xian)對講(jiang)(jiang)系(xi)統(tong)(tong)比(bi)較(jiao)(jiao))和抗電磁干擾能(neng)(neng)力強(與有(you)(you)(you)線(xian)對講(jiang)(jiang)系(xi)統(tong)(tong)比(bi)較(jiao)(jiao))的(de)特點。無線(xian)對講(jiang)(jiang)系(xi)統(tong)(tong)發(fa)射信(xin)(xin)(xin)號(hao)在(zai)發(fa)射前(qian)和發(fa)射后(hou)均(jun)能(neng)(neng)保持(chi)(chi)良好的(de)性(xing)能(neng)(neng)，使(shi)用過(guo)程中，發(fa)射信(xin)(xin)(xin)號(hao)與接收信(xin)(xin)(xin)號(hao)完全不受任何千(qian)擾，可保持(chi)(chi)很好的(de)穩(wen)(wen)(wen)定性(xing)，具(ju)有(you)(you)(you)良好的(de)抗千(qian)擾性(xing)和抗低頻干擾能(neng)(neng)力，即使(shi)在(zai)惡劣的(de)環境下也能(neng)(neng)保持(chi)(chi)較(jiao)(jiao)好的(de)性(xing)能(neng)(neng)。因此無線(xian)系(xi)統(tong)(tong)有(you)(you)(you)較(jiao)(jiao)高的(de)可靠(kao)性(xing)。

2.功耗小、不受天氣、濕度(du)的(de)影響

無(wu)線(xian)對(dui)講系(xi)統(tong)在不(bu)(bu)同的環境中，無(wu)線(xian)通(tong)信設備(bei)和有線(xian)通(tong)信設備(bei)一(yi)(yi)樣(yang)都(dou)要進行電(dian)能的消耗。當環境溫(wen)度在-40°C以(yi)下時(shi)，無(wu)線(xian)通(tong)信設備(bei)需要每天工作(zuo)8小(xiao)(xiao)(xiao)時(shi)左右;當環境溫(wen)度為(wei)-20°C時(shi)，每天工作(zuo)8小(xiao)(xiao)(xiao)時(shi)左右;當環境溫(wen)度為(wei)-30°C時(shi)，每天工作(zuo)4小(xiao)(xiao)(xiao)時(shi)左右。目(mu)前市場上常(chang)見的無(wu)線(xian)對(dui)講系(xi)統(tong)有兩種(zhong)電(dian)源(yuan)輸(shu)(shu)入方(fang)式(shi)(shi)，一(yi)(yi)種(zhong)是電(dian)源(yuan)輸(shu)(shu)入，另一(yi)(yi)種(zhong)是電(dian)源(yuan)輸(shu)(shu)出。從(cong)這(zhe)兩種(zhong)方(fang)式(shi)(shi)對(dui)系(xi)統(tong)的功(gong)耗來看，電(dian)源(yuan)輸(shu)(shu)入方(fang)式(shi)(shi)的功(gong)耗更(geng)大一(yi)(yi)些，但是功(gong)耗很小(xiao)(xiao)(xiao)。并且設備(bei)的工作(zuo)環境不(bu)(bu)同，對(dui)電(dian)池(chi)的需求量也不(bu)(bu)同，所(suo)以(yi)功(gong)耗也不(bu)(bu)同。

3信號不受干擾

在(zai)(zai)(zai)一(yi)些有(you)干(gan)(gan)擾(rao)(rao)的(de)(de)地方(fang)，例(li)如(ru)野外(wai)、機(ji)場、工(gong)廠等，一(yi)般采用(yong)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)方(fang)式(shi)。分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)方(fang)式(shi)的(de)(de)抗(kang)(kang)(kang)干(gan)(gan)擾(rao)(rao)能力(li)(li)(li)不(bu)強(qiang)，其抗(kang)(kang)(kang)干(gan)(gan)擾(rao)(rao)能力(li)(li)(li)主要(yao)取決于(yu)射(she)(she)(she)頻(pin)(pin)(pin)(pin)(pin)(pin)功(gong)(gong)率的(de)(de)大(da)小。分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)的(de)(de)功(gong)(gong)率一(yi)般是(shi)50dB在(zai)(zai)(zai)50dB左右(you)時(shi)(shi)，其抗(kang)(kang)(kang)干(gan)(gan)擾(rao)(rao)能力(li)(li)(li)強(qiang)。但由(you)于(yu)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)的(de)(de)干(gan)(gan)擾(rao)(rao)與噪聲(主要(yao)是(shi)周(zhou)邊(bian)噪聲)具有(you)很強(qiang)的(de)(de)互通性，當分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)發射(she)(she)(she)的(de)(de)信(xin)(xin)(xin)號(hao)超過50dB時(shi)(shi)，其抗(kang)(kang)(kang)千擾(rao)(rao)能力(li)(li)(li)就會減弱。另外(wai)，在(zai)(zai)(zai)一(yi)些有(you)噪音的(de)(de)環境中使(shi)用(yong)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)，會使(shi)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)信(xin)(xin)(xin)號(hao)無(wu)法(fa)到達(da)發射(she)(she)(she)端的(de)(de)接收(shou)機(ji)或(huo)(huo)者(zhe)造(zao)成發射(she)(she)(she)端信(xin)(xin)(xin)號(hao)與接收(shou)端信(xin)(xin)(xin)號(hao)的(de)(de)糟合而造(zao)成分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)或(huo)(huo)干(gan)(gan)擾(rao)(rao)(例(li)如(ru)在(zai)(zai)(zai)使(shi)用(yong)室(shi)外(wai)電話時(shi)(shi)) 。而采用(yong)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)的(de)(de)無(wu)線(xian)對(dui)(dui)講系統(tong)由(you)于(yu)發射(she)(she)(she)功(gong)(gong)率小，分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)后(hou)的(de)(de)信(xin)(xin)(xin)號(hao)強(qiang)度(du)(du)比有(you)線(xian)對(dui)(dui)講系統(tong)高很多(在(zai)(zai)(zai)實際(ji)使(shi)用(yong)中分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)設備(bei)一(yi)般可以(yi)將系統(tong)信(xin)(xin)(xin)號(hao)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)到50dB以(yi)上),信(xin)(xin)(xin)號(hao)不(bu)受(shou)干(gan)(gan)擾(rao)(rao)。如(ru)果采用(yong)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)，需要(yao)在(zai)(zai)(zai)較大(da)的(de)(de)回波功(gong)(gong)率下才能實現信(xin)(xin)(xin)號(hao)的(de)(de)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)工(gong)作(如(ru)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)器發射(she)(she)(she)信(xin)(xin)(xin)號(hao)與接收(shou)信(xin)(xin)(xin)號(hao)重疊時(shi)(shi)產生的(de)(de)千擾(rao)(rao))和發送信(xin)(xin)(xin)號(hao)強(qiang)度(du)(du)降(jiang)低(di)(同頻(pin)(pin)(pin)(pin)(pin)(pin)帶內的(de)(de)兩只天線(xian)對(dui)(dui)同一(yi)信(xin)(xin)(xin)道傳輸的(de)(de)信(xin)(xin)(xin)號(hao)強(qiang)度(du)(du)基本一(yi)致);如(ru)果采用(yong)混響技術(shu)，則可以(yi)實現對(dui)(dui)無(wu)線(xian)信(xin)(xin)(xin)號(hao)干(gan)(gan)擾(rao)(rao)的(de)(de)抑制或(huo)(huo)降(jiang)低(di)。