由于(yu)在戶(hu)外(wai)、室內(nei)等(deng)區域，無(wu)線(xian)對(dui)(dui)講系(xi)統(tong)(tong)的(de)(de)信號強度較弱，而且采(cai)用(yong)(yong)頻率調(diao)制技術（如 MHZ、 NMR、 BSI等(deng)）產(chan)生的(de)(de)信號傳輸(shu)時(shi)延大，傳輸(shu)距離遠。因此有(you)線(xian)對(dui)(dui)講系(xi)統(tong)(tong)不適合在戶(hu)外(wai)環境(jing)使(shi)(shi)(shi)用(yong)(yong)，特別是(shi)(shi)在冬天及低風速季節(jie)(jie)使(shi)(shi)(shi)用(yong)(yong)。雖然無(wu)線(xian)對(dui)(dui)講系(xi)統(tong)(tong)也有(you)著不錯的(de)(de)效果(guo)。但由于(yu)系(xi)統(tong)(tong)工作時(shi)會(hui)有(you)一定的(de)(de)干擾，使(shi)(shi)(shi)對(dui)(dui)講效果(guo)下降(jiang)，另外(wai)在信號較弱時(shi)對(dui)(dui)用(yong)(yong)戶(hu)語音產(chan)生了影響。特別是(shi)(shi)在人(ren)員復雜(za)、通信距離較短(duan)或需要較長時(shi)間(jian)使(shi)(shi)(shi)用(yong)(yong)時(shi)。因此，更(geng)需要有(you)一個可靠(kao)的(de)(de)無(wu)線(xian)對(dui)(dui)講系(xi)統(tong)(tong)提供與有(you)線(xian)對(dui)(dui)講系(xi)統(tong)(tong)一樣的(de)(de)語音信息與控制。無(wu)線(xian)對(dui)(dui)講系(xi)統(tong)(tong)具(ju)有(you)很高的(de)(de)靈活性，它能(neng)夠滿(man)足現場中所有(you)環境(jing)使(shi)(shi)(shi)用(yong)(yong)需求并能(neng)隨(sui)時(shi)切(qie)換（如在野(ye)外(wai)、戶(hu)外(wai)電話等(deng)),用(yong)(yong)戶(hu)可以在任何(he)地點使(shi)(shi)(shi)用(yong)(yong)、隨(sui)時(shi)、隨(sui)地進行通訊。使(shi)(shi)(shi)用(yong)(yong)方便、節(jie)(jie)省成本、節(jie)(jie)約費用(yong)(yong)。下面我們(men)來了解(jie)一下無(wu)線(xian)對(dui)(dui)講系(xi)統(tong)(tong)它主要是(shi)(shi)什么優點？

1.性(xing)能(neng)穩定，可靠性(xing)高

在(zai)相同(tong)無(wu)(wu)線(xian)(xian)傳輸距離下(xia)，無(wu)(wu)線(xian)(xian)傳輸信號更穩定(ding)由于使(shi)(shi)用了功率放大(da)器(qi)來對(dui)(dui)無(wu)(wu)線(xian)(xian)信號進行壓(ya)縮和放大(da)，使(shi)(shi)無(wu)(wu)線(xian)(xian)信號更加穩定(ding)可靠。無(wu)(wu)線(xian)(xian)信號在(zai)弱電(dian)磁環(huan)境下(xia)也(ye)能(neng)(neng)(neng)(neng)保持較好(hao)(hao)的性能(neng)(neng)(neng)(neng)。無(wu)(wu)線(xian)(xian)對(dui)(dui)講系統具(ju)(ju)有發射(she)(she)(she)功率小、抗千(qian)擾(rao)(rao)(rao)能(neng)(neng)(neng)(neng)力(li)(li)強(與有線(xian)(xian)對(dui)(dui)講系統比較)和抗電(dian)磁干(gan)擾(rao)(rao)(rao)能(neng)(neng)(neng)(neng)力(li)(li)強(與有線(xian)(xian)對(dui)(dui)講系統比較)的特點。無(wu)(wu)線(xian)(xian)對(dui)(dui)講系統發射(she)(she)(she)信號在(zai)發射(she)(she)(she)前和發射(she)(she)(she)后均(jun)能(neng)(neng)(neng)(neng)保持良好(hao)(hao)的性能(neng)(neng)(neng)(neng)，使(shi)(shi)用過程中，發射(she)(she)(she)信號與接收(shou)信號完全不受(shou)任何千(qian)擾(rao)(rao)(rao)，可保持很好(hao)(hao)的穩定(ding)性，具(ju)(ju)有良好(hao)(hao)的抗千(qian)擾(rao)(rao)(rao)性和抗低頻干(gan)擾(rao)(rao)(rao)能(neng)(neng)(neng)(neng)力(li)(li)，即使(shi)(shi)在(zai)惡劣的環(huan)境下(xia)也(ye)能(neng)(neng)(neng)(neng)保持較好(hao)(hao)的性能(neng)(neng)(neng)(neng)。因此無(wu)(wu)線(xian)(xian)系統有較高的可靠性。

2.功耗小、不受天氣、濕度(du)的影(ying)響

無(wu)(wu)線對(dui)講系統在不(bu)(bu)同的環(huan)境(jing)(jing)(jing)中，無(wu)(wu)線通(tong)信設(she)(she)(she)備和有線通(tong)信設(she)(she)(she)備一(yi)樣都要進行電(dian)(dian)能的消(xiao)耗(hao)(hao)。當環(huan)境(jing)(jing)(jing)溫(wen)(wen)度在-40°C以下時(shi)，無(wu)(wu)線通(tong)信設(she)(she)(she)備需要每天(tian)工(gong)作8小時(shi)左(zuo)(zuo)右(you);當環(huan)境(jing)(jing)(jing)溫(wen)(wen)度為-20°C時(shi)，每天(tian)工(gong)作8小時(shi)左(zuo)(zuo)右(you);當環(huan)境(jing)(jing)(jing)溫(wen)(wen)度為-30°C時(shi)，每天(tian)工(gong)作4小時(shi)左(zuo)(zuo)右(you)。目前市場上常見的無(wu)(wu)線對(dui)講系統有兩種電(dian)(dian)源(yuan)輸(shu)(shu)(shu)入方(fang)式(shi)，一(yi)種是電(dian)(dian)源(yuan)輸(shu)(shu)(shu)入，另(ling)一(yi)種是電(dian)(dian)源(yuan)輸(shu)(shu)(shu)出。從這兩種方(fang)式(shi)對(dui)系統的功(gong)耗(hao)(hao)來看，電(dian)(dian)源(yuan)輸(shu)(shu)(shu)入方(fang)式(shi)的功(gong)耗(hao)(hao)更大一(yi)些，但是功(gong)耗(hao)(hao)很小。并(bing)且設(she)(she)(she)備的工(gong)作環(huan)境(jing)(jing)(jing)不(bu)(bu)同，對(dui)電(dian)(dian)池(chi)的需求(qiu)量(liang)也不(bu)(bu)同，所以功(gong)耗(hao)(hao)也不(bu)(bu)同。

3信號不受干擾

在(zai)一些有干(gan)(gan)(gan)擾(rao)(rao)的(de)(de)(de)(de)地方，例如(ru)野外(wai)、機場、工廠等，一般(ban)采(cai)用(yong)(yong)分頻(pin)(pin)(pin)(pin)方式。分頻(pin)(pin)(pin)(pin)方式的(de)(de)(de)(de)抗干(gan)(gan)(gan)擾(rao)(rao)能力不(bu)強(qiang)，其抗干(gan)(gan)(gan)擾(rao)(rao)能力主(zhu)要(yao)取(qu)決(jue)于射(she)(she)頻(pin)(pin)(pin)(pin)功(gong)率(lv)(lv)的(de)(de)(de)(de)大(da)小。分頻(pin)(pin)(pin)(pin)技(ji)術的(de)(de)(de)(de)功(gong)率(lv)(lv)一般(ban)是(shi)50dB在(zai)50dB左(zuo)右時(shi)(shi)，其抗干(gan)(gan)(gan)擾(rao)(rao)能力強(qiang)。但(dan)由于分頻(pin)(pin)(pin)(pin)的(de)(de)(de)(de)干(gan)(gan)(gan)擾(rao)(rao)與(yu)噪(zao)(zao)聲(sheng)(主(zhu)要(yao)是(shi)周邊噪(zao)(zao)聲(sheng))具有很(hen)強(qiang)的(de)(de)(de)(de)互通(tong)性，當分頻(pin)(pin)(pin)(pin)發射(she)(she)的(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)(hao)(hao)超過50dB時(shi)(shi)，其抗千(qian)擾(rao)(rao)能力就會減弱。另外(wai)，在(zai)一些有噪(zao)(zao)音的(de)(de)(de)(de)環境中使(shi)用(yong)(yong)分頻(pin)(pin)(pin)(pin)技(ji)術，會使(shi)分頻(pin)(pin)(pin)(pin)信(xin)(xin)號(hao)(hao)(hao)(hao)(hao)無(wu)法到達發射(she)(she)端的(de)(de)(de)(de)接(jie)收機或(huo)者造成發射(she)(she)端信(xin)(xin)號(hao)(hao)(hao)(hao)(hao)與(yu)接(jie)收端信(xin)(xin)號(hao)(hao)(hao)(hao)(hao)的(de)(de)(de)(de)糟合而造成分頻(pin)(pin)(pin)(pin)或(huo)干(gan)(gan)(gan)擾(rao)(rao)(例如(ru)在(zai)使(shi)用(yong)(yong)室外(wai)電話(hua)時(shi)(shi)) 。而采(cai)用(yong)(yong)分頻(pin)(pin)(pin)(pin)技(ji)術的(de)(de)(de)(de)無(wu)線(xian)(xian)對講(jiang)系(xi)(xi)統(tong)由于發射(she)(she)功(gong)率(lv)(lv)小，分頻(pin)(pin)(pin)(pin)后的(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)(hao)(hao)強(qiang)度比(bi)有線(xian)(xian)對講(jiang)系(xi)(xi)統(tong)高很(hen)多(在(zai)實(shi)際使(shi)用(yong)(yong)中分頻(pin)(pin)(pin)(pin)設備一般(ban)可以(yi)將系(xi)(xi)統(tong)信(xin)(xin)號(hao)(hao)(hao)(hao)(hao)分頻(pin)(pin)(pin)(pin)到50dB以(yi)上),信(xin)(xin)號(hao)(hao)(hao)(hao)(hao)不(bu)受干(gan)(gan)(gan)擾(rao)(rao)。如(ru)果(guo)采(cai)用(yong)(yong)分頻(pin)(pin)(pin)(pin)技(ji)術，需要(yao)在(zai)較大(da)的(de)(de)(de)(de)回波功(gong)率(lv)(lv)下(xia)才(cai)能實(shi)現信(xin)(xin)號(hao)(hao)(hao)(hao)(hao)的(de)(de)(de)(de)分頻(pin)(pin)(pin)(pin)工作(如(ru)分頻(pin)(pin)(pin)(pin)器發射(she)(she)信(xin)(xin)號(hao)(hao)(hao)(hao)(hao)與(yu)接(jie)收信(xin)(xin)號(hao)(hao)(hao)(hao)(hao)重(zhong)疊時(shi)(shi)產(chan)生的(de)(de)(de)(de)千(qian)擾(rao)(rao))和發送(song)信(xin)(xin)號(hao)(hao)(hao)(hao)(hao)強(qiang)度降(jiang)低(di)(同頻(pin)(pin)(pin)(pin)帶(dai)內的(de)(de)(de)(de)兩只天線(xian)(xian)對同一信(xin)(xin)道傳輸的(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)(hao)(hao)強(qiang)度基本一致(zhi));如(ru)果(guo)采(cai)用(yong)(yong)混響技(ji)術，則可以(yi)實(shi)現對無(wu)線(xian)(xian)信(xin)(xin)號(hao)(hao)(hao)(hao)(hao)干(gan)(gan)(gan)擾(rao)(rao)的(de)(de)(de)(de)抑制或(huo)降(jiang)低(di)。