由于(yu)在戶(hu)外(wai)(wai)、室內(nei)等區(qu)域，無(wu)(wu)線(xian)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)系(xi)(xi)統(tong)的信(xin)號強度較(jiao)(jiao)(jiao)弱(ruo)，而(er)且采用(yong)(yong)頻率調制技術（如 MHZ、 NMR、 BSI等）產生的信(xin)號傳(chuan)輸時延大，傳(chuan)輸距(ju)離(li)遠。因此有(you)(you)線(xian)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)系(xi)(xi)統(tong)不適合(he)在戶(hu)外(wai)(wai)環境使(shi)用(yong)(yong)，特別是在冬天及低(di)風速季節(jie)(jie)使(shi)用(yong)(yong)。雖然無(wu)(wu)線(xian)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)系(xi)(xi)統(tong)也(ye)有(you)(you)著不錯(cuo)的效果(guo)。但(dan)由于(yu)系(xi)(xi)統(tong)工作時會(hui)有(you)(you)一(yi)定(ding)的干擾，使(shi)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)效果(guo)下降，另(ling)外(wai)(wai)在信(xin)號較(jiao)(jiao)(jiao)弱(ruo)時對(dui)(dui)用(yong)(yong)戶(hu)語(yu)音(yin)產生了(le)影(ying)響。特別是在人員復雜(za)、通(tong)信(xin)距(ju)離(li)較(jiao)(jiao)(jiao)短或(huo)需要(yao)較(jiao)(jiao)(jiao)長時間使(shi)用(yong)(yong)時。因此，更需要(yao)有(you)(you)一(yi)個可靠的無(wu)(wu)線(xian)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)系(xi)(xi)統(tong)提供與有(you)(you)線(xian)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)系(xi)(xi)統(tong)一(yi)樣的語(yu)音(yin)信(xin)息與控制。無(wu)(wu)線(xian)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)系(xi)(xi)統(tong)具有(you)(you)很高的靈(ling)活性，它能夠滿足現場中(zhong)所有(you)(you)環境使(shi)用(yong)(yong)需求并能隨時切(qie)換（如在野外(wai)(wai)、戶(hu)外(wai)(wai)電(dian)話等),用(yong)(yong)戶(hu)可以在任何地(di)點(dian)使(shi)用(yong)(yong)、隨時、隨地(di)進行通(tong)訊(xun)。使(shi)用(yong)(yong)方便、節(jie)(jie)省(sheng)成(cheng)本(ben)、節(jie)(jie)約費用(yong)(yong)。下面我們來(lai)了(le)解一(yi)下無(wu)(wu)線(xian)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)(jiang)系(xi)(xi)統(tong)它主(zhu)要(yao)是什么(me)優點(dian)？

1.性能(neng)穩定(ding)，可靠(kao)性高

在相同無(wu)(wu)線(xian)(xian)傳(chuan)輸距離(li)下(xia)，無(wu)(wu)線(xian)(xian)傳(chuan)輸信(xin)(xin)號(hao)(hao)更穩(wen)定由于使(shi)用了功率放大器來對(dui)無(wu)(wu)線(xian)(xian)信(xin)(xin)號(hao)(hao)進行壓(ya)縮和(he)放大，使(shi)無(wu)(wu)線(xian)(xian)信(xin)(xin)號(hao)(hao)更加穩(wen)定可靠。無(wu)(wu)線(xian)(xian)信(xin)(xin)號(hao)(hao)在弱電(dian)磁環(huan)境(jing)下(xia)也能(neng)(neng)保(bao)(bao)持較(jiao)好的(de)性(xing)能(neng)(neng)。無(wu)(wu)線(xian)(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)具(ju)有發(fa)(fa)射(she)(she)功率小、抗(kang)千(qian)擾(rao)能(neng)(neng)力(li)強(qiang)(與有線(xian)(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)比較(jiao))和(he)抗(kang)電(dian)磁干(gan)擾(rao)能(neng)(neng)力(li)強(qiang)(與有線(xian)(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)比較(jiao))的(de)特點。無(wu)(wu)線(xian)(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)發(fa)(fa)射(she)(she)信(xin)(xin)號(hao)(hao)在發(fa)(fa)射(she)(she)前和(he)發(fa)(fa)射(she)(she)后均能(neng)(neng)保(bao)(bao)持良好的(de)性(xing)能(neng)(neng)，使(shi)用過程中，發(fa)(fa)射(she)(she)信(xin)(xin)號(hao)(hao)與接收信(xin)(xin)號(hao)(hao)完全不受(shou)任何千(qian)擾(rao)，可保(bao)(bao)持很好的(de)穩(wen)定性(xing)，具(ju)有良好的(de)抗(kang)千(qian)擾(rao)性(xing)和(he)抗(kang)低頻干(gan)擾(rao)能(neng)(neng)力(li)，即(ji)使(shi)在惡劣的(de)環(huan)境(jing)下(xia)也能(neng)(neng)保(bao)(bao)持較(jiao)好的(de)性(xing)能(neng)(neng)。因此無(wu)(wu)線(xian)(xian)系(xi)(xi)統(tong)有較(jiao)高的(de)可靠性(xing)。

2.功(gong)耗小、不受天氣、濕度的影響

無線(xian)對(dui)講系(xi)(xi)統在不(bu)同(tong)的(de)環境(jing)中，無線(xian)通(tong)(tong)信(xin)設備(bei)和(he)有(you)線(xian)通(tong)(tong)信(xin)設備(bei)一樣(yang)都要進行電(dian)(dian)能的(de)消耗。當(dang)環境(jing)溫度在-40°C以下時(shi)(shi)，無線(xian)通(tong)(tong)信(xin)設備(bei)需要每天(tian)工(gong)(gong)作8小(xiao)時(shi)(shi)左右(you);當(dang)環境(jing)溫度為-20°C時(shi)(shi)，每天(tian)工(gong)(gong)作8小(xiao)時(shi)(shi)左右(you);當(dang)環境(jing)溫度為-30°C時(shi)(shi)，每天(tian)工(gong)(gong)作4小(xiao)時(shi)(shi)左右(you)。目前(qian)市場(chang)上常見的(de)無線(xian)對(dui)講系(xi)(xi)統有(you)兩種(zhong)電(dian)(dian)源(yuan)(yuan)輸(shu)(shu)入方(fang)(fang)式(shi)，一種(zhong)是(shi)電(dian)(dian)源(yuan)(yuan)輸(shu)(shu)入，另(ling)一種(zhong)是(shi)電(dian)(dian)源(yuan)(yuan)輸(shu)(shu)出。從(cong)這兩種(zhong)方(fang)(fang)式(shi)對(dui)系(xi)(xi)統的(de)功耗來看，電(dian)(dian)源(yuan)(yuan)輸(shu)(shu)入方(fang)(fang)式(shi)的(de)功耗更大(da)一些，但是(shi)功耗很小(xiao)。并且(qie)設備(bei)的(de)工(gong)(gong)作環境(jing)不(bu)同(tong)，對(dui)電(dian)(dian)池的(de)需求量也不(bu)同(tong)，所以功耗也不(bu)同(tong)。

3信號不受干擾

在(zai)一(yi)些有干(gan)擾(rao)(rao)(rao)(rao)的(de)(de)(de)地方(fang)，例(li)如(ru)野(ye)外、機(ji)場、工廠等，一(yi)般(ban)采(cai)(cai)(cai)用(yong)分頻(pin)(pin)(pin)(pin)方(fang)式(shi)。分頻(pin)(pin)(pin)(pin)方(fang)式(shi)的(de)(de)(de)抗干(gan)擾(rao)(rao)(rao)(rao)能力(li)不(bu)強(qiang)(qiang)，其(qi)抗干(gan)擾(rao)(rao)(rao)(rao)能力(li)主要取決于(yu)(yu)射(she)頻(pin)(pin)(pin)(pin)功率(lv)(lv)的(de)(de)(de)大(da)小。分頻(pin)(pin)(pin)(pin)技(ji)(ji)術(shu)的(de)(de)(de)功率(lv)(lv)一(yi)般(ban)是(shi)50dB在(zai)50dB左右時(shi)，其(qi)抗干(gan)擾(rao)(rao)(rao)(rao)能力(li)強(qiang)(qiang)。但(dan)由于(yu)(yu)分頻(pin)(pin)(pin)(pin)的(de)(de)(de)干(gan)擾(rao)(rao)(rao)(rao)與噪聲(主要是(shi)周(zhou)邊噪聲)具有很強(qiang)(qiang)的(de)(de)(de)互(hu)通性，當分頻(pin)(pin)(pin)(pin)發(fa)射(she)的(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)超過50dB時(shi)，其(qi)抗千擾(rao)(rao)(rao)(rao)能力(li)就會(hui)減弱。另外，在(zai)一(yi)些有噪音的(de)(de)(de)環(huan)境(jing)中使用(yong)分頻(pin)(pin)(pin)(pin)技(ji)(ji)術(shu)，會(hui)使分頻(pin)(pin)(pin)(pin)信(xin)(xin)(xin)號(hao)(hao)(hao)無法(fa)到(dao)達發(fa)射(she)端(duan)(duan)的(de)(de)(de)接(jie)收(shou)機(ji)或(huo)者造成發(fa)射(she)端(duan)(duan)信(xin)(xin)(xin)號(hao)(hao)(hao)與接(jie)收(shou)端(duan)(duan)信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)糟合而造成分頻(pin)(pin)(pin)(pin)或(huo)干(gan)擾(rao)(rao)(rao)(rao)(例(li)如(ru)在(zai)使用(yong)室外電話時(shi)) 。而采(cai)(cai)(cai)用(yong)分頻(pin)(pin)(pin)(pin)技(ji)(ji)術(shu)的(de)(de)(de)無線(xian)對講(jiang)系統(tong)(tong)由于(yu)(yu)發(fa)射(she)功率(lv)(lv)小，分頻(pin)(pin)(pin)(pin)后的(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)度(du)比(bi)有線(xian)對講(jiang)系統(tong)(tong)高很多(在(zai)實際使用(yong)中分頻(pin)(pin)(pin)(pin)設備一(yi)般(ban)可以將系統(tong)(tong)信(xin)(xin)(xin)號(hao)(hao)(hao)分頻(pin)(pin)(pin)(pin)到(dao)50dB以上),信(xin)(xin)(xin)號(hao)(hao)(hao)不(bu)受干(gan)擾(rao)(rao)(rao)(rao)。如(ru)果(guo)采(cai)(cai)(cai)用(yong)分頻(pin)(pin)(pin)(pin)技(ji)(ji)術(shu)，需要在(zai)較(jiao)大(da)的(de)(de)(de)回(hui)波(bo)功率(lv)(lv)下才(cai)能實現信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)分頻(pin)(pin)(pin)(pin)工作(如(ru)分頻(pin)(pin)(pin)(pin)器發(fa)射(she)信(xin)(xin)(xin)號(hao)(hao)(hao)與接(jie)收(shou)信(xin)(xin)(xin)號(hao)(hao)(hao)重疊(die)時(shi)產(chan)生的(de)(de)(de)千擾(rao)(rao)(rao)(rao))和發(fa)送(song)信(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)度(du)降低(di)(同(tong)頻(pin)(pin)(pin)(pin)帶內的(de)(de)(de)兩只天線(xian)對同(tong)一(yi)信(xin)(xin)(xin)道傳輸的(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)度(du)基本一(yi)致);如(ru)果(guo)采(cai)(cai)(cai)用(yong)混響技(ji)(ji)術(shu)，則(ze)可以實現對無線(xian)信(xin)(xin)(xin)號(hao)(hao)(hao)干(gan)擾(rao)(rao)(rao)(rao)的(de)(de)(de)抑制或(huo)降低(di)。