由于在(zai)(zai)戶(hu)外(wai)(wai)(wai)、室(shi)內(nei)等(deng)(deng)區域，無(wu)線(xian)(xian)對(dui)(dui)講系(xi)統(tong)(tong)(tong)(tong)的(de)(de)(de)信(xin)(xin)(xin)(xin)號強(qiang)度較弱，而且采用(yong)頻率(lv)調制(zhi)技術（如 MHZ、 NMR、 BSI等(deng)(deng)）產生的(de)(de)(de)信(xin)(xin)(xin)(xin)號傳(chuan)輸時(shi)延大，傳(chuan)輸距離遠。因此有線(xian)(xian)對(dui)(dui)講系(xi)統(tong)(tong)(tong)(tong)不適合(he)在(zai)(zai)戶(hu)外(wai)(wai)(wai)環境(jing)使用(yong)，特別(bie)是在(zai)(zai)冬天及(ji)低風速季節使用(yong)。雖(sui)然無(wu)線(xian)(xian)對(dui)(dui)講系(xi)統(tong)(tong)(tong)(tong)也有著(zhu)不錯的(de)(de)(de)效果。但由于系(xi)統(tong)(tong)(tong)(tong)工作時(shi)會有一定(ding)的(de)(de)(de)干(gan)擾，使對(dui)(dui)講效果下降(jiang)，另(ling)外(wai)(wai)(wai)在(zai)(zai)信(xin)(xin)(xin)(xin)號較弱時(shi)對(dui)(dui)用(yong)戶(hu)語音產生了影(ying)響(xiang)。特別(bie)是在(zai)(zai)人(ren)員復雜、通(tong)信(xin)(xin)(xin)(xin)距離較短或需要較長時(shi)間使用(yong)時(shi)。因此，更(geng)需要有一個可靠的(de)(de)(de)無(wu)線(xian)(xian)對(dui)(dui)講系(xi)統(tong)(tong)(tong)(tong)提供與有線(xian)(xian)對(dui)(dui)講系(xi)統(tong)(tong)(tong)(tong)一樣的(de)(de)(de)語音信(xin)(xin)(xin)(xin)息與控制(zhi)。無(wu)線(xian)(xian)對(dui)(dui)講系(xi)統(tong)(tong)(tong)(tong)具(ju)有很(hen)高的(de)(de)(de)靈活性(xing)，它能(neng)夠(gou)滿足現場中(zhong)所有環境(jing)使用(yong)需求(qiu)并能(neng)隨(sui)(sui)時(shi)切(qie)換（如在(zai)(zai)野外(wai)(wai)(wai)、戶(hu)外(wai)(wai)(wai)電話(hua)等(deng)(deng)),用(yong)戶(hu)可以在(zai)(zai)任何(he)地(di)點使用(yong)、隨(sui)(sui)時(shi)、隨(sui)(sui)地(di)進(jin)行通(tong)訊。使用(yong)方便、節省(sheng)成本、節約費用(yong)。下面我們(men)來了解(jie)一下無(wu)線(xian)(xian)對(dui)(dui)講系(xi)統(tong)(tong)(tong)(tong)它主(zhu)要是什(shen)么優點？

1.性(xing)能穩(wen)定，可(ke)靠性(xing)高

在相同無(wu)(wu)線(xian)傳輸距離下，無(wu)(wu)線(xian)傳輸信(xin)號(hao)更穩定由于使用(yong)(yong)了功(gong)率放(fang)大(da)器來對(dui)無(wu)(wu)線(xian)信(xin)號(hao)進行壓縮和(he)放(fang)大(da)，使無(wu)(wu)線(xian)信(xin)號(hao)更加穩定可(ke)靠。無(wu)(wu)線(xian)信(xin)號(hao)在弱電磁(ci)環境下也(ye)(ye)能(neng)保(bao)(bao)(bao)持較(jiao)(jiao)(jiao)好(hao)的(de)性能(neng)。無(wu)(wu)線(xian)對(dui)講系(xi)(xi)統(tong)具(ju)有(you)發射功(gong)率小(xiao)、抗(kang)千(qian)擾(rao)能(neng)力(li)(li)強(與有(you)線(xian)對(dui)講系(xi)(xi)統(tong)比較(jiao)(jiao)(jiao))和(he)抗(kang)電磁(ci)干(gan)擾(rao)能(neng)力(li)(li)強(與有(you)線(xian)對(dui)講系(xi)(xi)統(tong)比較(jiao)(jiao)(jiao))的(de)特點(dian)。無(wu)(wu)線(xian)對(dui)講系(xi)(xi)統(tong)發射信(xin)號(hao)在發射前和(he)發射后均能(neng)保(bao)(bao)(bao)持良好(hao)的(de)性能(neng)，使用(yong)(yong)過程中，發射信(xin)號(hao)與接收信(xin)號(hao)完全(quan)不受任何千(qian)擾(rao)，可(ke)保(bao)(bao)(bao)持很(hen)好(hao)的(de)穩定性，具(ju)有(you)良好(hao)的(de)抗(kang)千(qian)擾(rao)性和(he)抗(kang)低(di)頻干(gan)擾(rao)能(neng)力(li)(li)，即使在惡(e)劣的(de)環境下也(ye)(ye)能(neng)保(bao)(bao)(bao)持較(jiao)(jiao)(jiao)好(hao)的(de)性能(neng)。因此無(wu)(wu)線(xian)系(xi)(xi)統(tong)有(you)較(jiao)(jiao)(jiao)高的(de)可(ke)靠性。

2.功耗小、不受天(tian)氣、濕度的(de)影響

無(wu)線(xian)對講系統(tong)(tong)(tong)在不(bu)同(tong)的環(huan)境(jing)中，無(wu)線(xian)通(tong)信設(she)備(bei)和(he)有(you)線(xian)通(tong)信設(she)備(bei)一(yi)樣都(dou)要(yao)進行(xing)電(dian)能的消耗(hao)(hao)。當(dang)環(huan)境(jing)溫度在-40°C以下時，無(wu)線(xian)通(tong)信設(she)備(bei)需要(yao)每天(tian)工(gong)作8小(xiao)(xiao)時左右;當(dang)環(huan)境(jing)溫度為(wei)-20°C時，每天(tian)工(gong)作8小(xiao)(xiao)時左右;當(dang)環(huan)境(jing)溫度為(wei)-30°C時，每天(tian)工(gong)作4小(xiao)(xiao)時左右。目(mu)前市(shi)場上常(chang)見的無(wu)線(xian)對講系統(tong)(tong)(tong)有(you)兩種電(dian)源(yuan)輸(shu)(shu)入方(fang)式(shi)，一(yi)種是(shi)電(dian)源(yuan)輸(shu)(shu)入，另一(yi)種是(shi)電(dian)源(yuan)輸(shu)(shu)出。從(cong)這兩種方(fang)式(shi)對系統(tong)(tong)(tong)的功(gong)耗(hao)(hao)來看，電(dian)源(yuan)輸(shu)(shu)入方(fang)式(shi)的功(gong)耗(hao)(hao)更大一(yi)些(xie)，但是(shi)功(gong)耗(hao)(hao)很小(xiao)(xiao)。并(bing)且設(she)備(bei)的工(gong)作環(huan)境(jing)不(bu)同(tong)，對電(dian)池(chi)的需求量也不(bu)同(tong)，所(suo)以功(gong)耗(hao)(hao)也不(bu)同(tong)。

3信號不受干擾

在(zai)一(yi)(yi)些有干(gan)(gan)擾(rao)(rao)(rao)(rao)的(de)(de)地(di)方(fang)(fang)，例(li)如(ru)(ru)(ru)野外(wai)、機場(chang)、工廠等，一(yi)(yi)般(ban)采用(yong)分(fen)(fen)頻(pin)(pin)(pin)方(fang)(fang)式。分(fen)(fen)頻(pin)(pin)(pin)方(fang)(fang)式的(de)(de)抗干(gan)(gan)擾(rao)(rao)(rao)(rao)能(neng)(neng)力不強(qiang)(qiang)，其(qi)抗干(gan)(gan)擾(rao)(rao)(rao)(rao)能(neng)(neng)力主要取決于射頻(pin)(pin)(pin)功(gong)率(lv)的(de)(de)大小。分(fen)(fen)頻(pin)(pin)(pin)技(ji)(ji)術(shu)(shu)的(de)(de)功(gong)率(lv)一(yi)(yi)般(ban)是50dB在(zai)50dB左右時，其(qi)抗干(gan)(gan)擾(rao)(rao)(rao)(rao)能(neng)(neng)力強(qiang)(qiang)。但由(you)于分(fen)(fen)頻(pin)(pin)(pin)的(de)(de)干(gan)(gan)擾(rao)(rao)(rao)(rao)與(yu)噪聲(sheng)(主要是周邊(bian)噪聲(sheng))具有很強(qiang)(qiang)的(de)(de)互(hu)通性，當分(fen)(fen)頻(pin)(pin)(pin)發(fa)射的(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)超過50dB時，其(qi)抗千(qian)(qian)擾(rao)(rao)(rao)(rao)能(neng)(neng)力就會減(jian)弱。另外(wai)，在(zai)一(yi)(yi)些有噪音的(de)(de)環境(jing)中使(shi)用(yong)分(fen)(fen)頻(pin)(pin)(pin)技(ji)(ji)術(shu)(shu)，會使(shi)分(fen)(fen)頻(pin)(pin)(pin)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)無法到達發(fa)射端(duan)的(de)(de)接收機或(huo)(huo)者造成發(fa)射端(duan)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接收端(duan)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)糟(zao)合而(er)造成分(fen)(fen)頻(pin)(pin)(pin)或(huo)(huo)干(gan)(gan)擾(rao)(rao)(rao)(rao)(例(li)如(ru)(ru)(ru)在(zai)使(shi)用(yong)室外(wai)電話時) 。而(er)采用(yong)分(fen)(fen)頻(pin)(pin)(pin)技(ji)(ji)術(shu)(shu)的(de)(de)無線對(dui)(dui)(dui)講系(xi)統(tong)由(you)于發(fa)射功(gong)率(lv)小，分(fen)(fen)頻(pin)(pin)(pin)后的(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)度(du)(du)比有線對(dui)(dui)(dui)講系(xi)統(tong)高很多(duo)(在(zai)實(shi)際使(shi)用(yong)中分(fen)(fen)頻(pin)(pin)(pin)設備一(yi)(yi)般(ban)可(ke)以將(jiang)系(xi)統(tong)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)分(fen)(fen)頻(pin)(pin)(pin)到50dB以上),信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)不受干(gan)(gan)擾(rao)(rao)(rao)(rao)。如(ru)(ru)(ru)果采用(yong)分(fen)(fen)頻(pin)(pin)(pin)技(ji)(ji)術(shu)(shu)，需要在(zai)較(jiao)大的(de)(de)回波(bo)功(gong)率(lv)下才(cai)能(neng)(neng)實(shi)現信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)分(fen)(fen)頻(pin)(pin)(pin)工作(如(ru)(ru)(ru)分(fen)(fen)頻(pin)(pin)(pin)器發(fa)射信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接收信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)重疊時產生的(de)(de)千(qian)(qian)擾(rao)(rao)(rao)(rao))和(he)發(fa)送信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)度(du)(du)降(jiang)低(di)(di)(同頻(pin)(pin)(pin)帶內的(de)(de)兩只天線對(dui)(dui)(dui)同一(yi)(yi)信(xin)(xin)(xin)(xin)道(dao)傳輸的(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)度(du)(du)基本一(yi)(yi)致);如(ru)(ru)(ru)果采用(yong)混(hun)響技(ji)(ji)術(shu)(shu)，則可(ke)以實(shi)現對(dui)(dui)(dui)無線信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)干(gan)(gan)擾(rao)(rao)(rao)(rao)的(de)(de)抑制或(huo)(huo)降(jiang)低(di)(di)。