由(you)于在戶(hu)(hu)外(wai)、室內等區域，無線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)(tong)的(de)信號(hao)強度較(jiao)(jiao)弱(ruo)，而且采用(yong)(yong)(yong)頻率調制技術（如(ru) MHZ、 NMR、 BSI等）產生的(de)信號(hao)傳(chuan)輸(shu)時延大，傳(chuan)輸(shu)距離遠。因(yin)此有(you)線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)(tong)不適合在戶(hu)(hu)外(wai)環(huan)境使(shi)(shi)(shi)用(yong)(yong)(yong)，特(te)別(bie)(bie)是在冬天及低風速季節使(shi)(shi)(shi)用(yong)(yong)(yong)。雖然無線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)(tong)也有(you)著不錯的(de)效果(guo)。但由(you)于系(xi)(xi)統(tong)(tong)(tong)工作時會(hui)有(you)一(yi)定(ding)的(de)干擾(rao)，使(shi)(shi)(shi)對(dui)(dui)(dui)講(jiang)(jiang)效果(guo)下(xia)降，另外(wai)在信號(hao)較(jiao)(jiao)弱(ruo)時對(dui)(dui)(dui)用(yong)(yong)(yong)戶(hu)(hu)語(yu)音產生了影響(xiang)。特(te)別(bie)(bie)是在人(ren)員(yuan)復雜、通信距離較(jiao)(jiao)短或需要(yao)較(jiao)(jiao)長時間使(shi)(shi)(shi)用(yong)(yong)(yong)時。因(yin)此，更需要(yao)有(you)一(yi)個(ge)可靠的(de)無線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)(tong)提供與有(you)線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)(tong)一(yi)樣的(de)語(yu)音信息與控制。無線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)(tong)具(ju)有(you)很(hen)高的(de)靈(ling)活性，它能夠(gou)滿足(zu)現場中所(suo)有(you)環(huan)境使(shi)(shi)(shi)用(yong)(yong)(yong)需求(qiu)并(bing)能隨(sui)時切換（如(ru)在野(ye)外(wai)、戶(hu)(hu)外(wai)電話等),用(yong)(yong)(yong)戶(hu)(hu)可以在任(ren)何地點(dian)使(shi)(shi)(shi)用(yong)(yong)(yong)、隨(sui)時、隨(sui)地進(jin)行通訊。使(shi)(shi)(shi)用(yong)(yong)(yong)方便、節省(sheng)成本(ben)、節約費用(yong)(yong)(yong)。下(xia)面(mian)我們來了解一(yi)下(xia)無線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)(tong)它主要(yao)是什么優點(dian)？

1.性(xing)能(neng)穩定，可靠性(xing)高

在(zai)相(xiang)同(tong)無(wu)(wu)線(xian)(xian)傳輸距離下，無(wu)(wu)線(xian)(xian)傳輸信(xin)(xin)號(hao)(hao)更穩定由于(yu)使(shi)(shi)用(yong)了(le)功率放大(da)器來對(dui)(dui)無(wu)(wu)線(xian)(xian)信(xin)(xin)號(hao)(hao)進行壓縮和(he)放大(da)，使(shi)(shi)無(wu)(wu)線(xian)(xian)信(xin)(xin)號(hao)(hao)更加穩定可(ke)靠。無(wu)(wu)線(xian)(xian)信(xin)(xin)號(hao)(hao)在(zai)弱電(dian)磁(ci)(ci)環境(jing)下也能(neng)(neng)(neng)(neng)保(bao)持較(jiao)好(hao)的(de)性(xing)(xing)能(neng)(neng)(neng)(neng)。無(wu)(wu)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)統(tong)具有(you)發(fa)(fa)射(she)功率小、抗(kang)千(qian)擾(rao)能(neng)(neng)(neng)(neng)力強(與(yu)有(you)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)統(tong)比(bi)較(jiao))和(he)抗(kang)電(dian)磁(ci)(ci)干(gan)(gan)擾(rao)能(neng)(neng)(neng)(neng)力強(與(yu)有(you)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)統(tong)比(bi)較(jiao))的(de)特(te)點。無(wu)(wu)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)統(tong)發(fa)(fa)射(she)信(xin)(xin)號(hao)(hao)在(zai)發(fa)(fa)射(she)前和(he)發(fa)(fa)射(she)后均能(neng)(neng)(neng)(neng)保(bao)持良好(hao)的(de)性(xing)(xing)能(neng)(neng)(neng)(neng)，使(shi)(shi)用(yong)過程中，發(fa)(fa)射(she)信(xin)(xin)號(hao)(hao)與(yu)接(jie)收信(xin)(xin)號(hao)(hao)完全不受任何(he)千(qian)擾(rao)，可(ke)保(bao)持很好(hao)的(de)穩定性(xing)(xing)，具有(you)良好(hao)的(de)抗(kang)千(qian)擾(rao)性(xing)(xing)和(he)抗(kang)低頻干(gan)(gan)擾(rao)能(neng)(neng)(neng)(neng)力，即(ji)使(shi)(shi)在(zai)惡劣的(de)環境(jing)下也能(neng)(neng)(neng)(neng)保(bao)持較(jiao)好(hao)的(de)性(xing)(xing)能(neng)(neng)(neng)(neng)。因此無(wu)(wu)線(xian)(xian)系(xi)統(tong)有(you)較(jiao)高的(de)可(ke)靠性(xing)(xing)。

2.功耗小、不受天氣、濕度的影(ying)響

無線對(dui)講(jiang)(jiang)系(xi)統在(zai)不(bu)同(tong)(tong)的(de)環(huan)境中，無線通信(xin)(xin)設(she)(she)備(bei)(bei)和(he)有線通信(xin)(xin)設(she)(she)備(bei)(bei)一(yi)(yi)(yi)樣都要(yao)進行電(dian)(dian)能的(de)消耗(hao)。當(dang)環(huan)境溫(wen)度在(zai)-40°C以下時(shi)(shi)，無線通信(xin)(xin)設(she)(she)備(bei)(bei)需要(yao)每(mei)天工作(zuo)8小(xiao)時(shi)(shi)左(zuo)右(you);當(dang)環(huan)境溫(wen)度為-20°C時(shi)(shi)，每(mei)天工作(zuo)8小(xiao)時(shi)(shi)左(zuo)右(you);當(dang)環(huan)境溫(wen)度為-30°C時(shi)(shi)，每(mei)天工作(zuo)4小(xiao)時(shi)(shi)左(zuo)右(you)。目前(qian)市(shi)場(chang)上常見的(de)無線對(dui)講(jiang)(jiang)系(xi)統有兩種(zhong)(zhong)電(dian)(dian)源輸(shu)入方式(shi)，一(yi)(yi)(yi)種(zhong)(zhong)是(shi)電(dian)(dian)源輸(shu)入，另一(yi)(yi)(yi)種(zhong)(zhong)是(shi)電(dian)(dian)源輸(shu)出。從(cong)這兩種(zhong)(zhong)方式(shi)對(dui)系(xi)統的(de)功耗(hao)來看，電(dian)(dian)源輸(shu)入方式(shi)的(de)功耗(hao)更大一(yi)(yi)(yi)些(xie)，但是(shi)功耗(hao)很小(xiao)。并且(qie)設(she)(she)備(bei)(bei)的(de)工作(zuo)環(huan)境不(bu)同(tong)(tong)，對(dui)電(dian)(dian)池的(de)需求量也不(bu)同(tong)(tong)，所以功耗(hao)也不(bu)同(tong)(tong)。

3信號不受干擾

在(zai)(zai)(zai)(zai)一些有(you)干(gan)擾(rao)(rao)(rao)(rao)(rao)的(de)(de)(de)地方(fang)，例(li)如野外、機場、工(gong)廠等，一般(ban)采(cai)(cai)用(yong)(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)方(fang)式(shi)(shi)。分(fen)(fen)(fen)(fen)頻(pin)(pin)方(fang)式(shi)(shi)的(de)(de)(de)抗(kang)干(gan)擾(rao)(rao)(rao)(rao)(rao)能(neng)力不強(qiang)，其(qi)(qi)(qi)抗(kang)干(gan)擾(rao)(rao)(rao)(rao)(rao)能(neng)力主要(yao)取決(jue)于射(she)頻(pin)(pin)功(gong)(gong)率(lv)(lv)的(de)(de)(de)大小(xiao)。分(fen)(fen)(fen)(fen)頻(pin)(pin)技術的(de)(de)(de)功(gong)(gong)率(lv)(lv)一般(ban)是50dB在(zai)(zai)(zai)(zai)50dB左右(you)時，其(qi)(qi)(qi)抗(kang)干(gan)擾(rao)(rao)(rao)(rao)(rao)能(neng)力強(qiang)。但由于分(fen)(fen)(fen)(fen)頻(pin)(pin)的(de)(de)(de)干(gan)擾(rao)(rao)(rao)(rao)(rao)與噪聲(主要(yao)是周邊噪聲)具(ju)有(you)很強(qiang)的(de)(de)(de)互通性，當(dang)分(fen)(fen)(fen)(fen)頻(pin)(pin)發(fa)(fa)(fa)射(she)的(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)超過50dB時，其(qi)(qi)(qi)抗(kang)千擾(rao)(rao)(rao)(rao)(rao)能(neng)力就(jiu)會減弱。另(ling)外，在(zai)(zai)(zai)(zai)一些有(you)噪音的(de)(de)(de)環境中使(shi)用(yong)(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)技術，會使(shi)分(fen)(fen)(fen)(fen)頻(pin)(pin)信(xin)(xin)號(hao)(hao)(hao)無法(fa)到達發(fa)(fa)(fa)射(she)端的(de)(de)(de)接收(shou)機或者(zhe)造(zao)成發(fa)(fa)(fa)射(she)端信(xin)(xin)號(hao)(hao)(hao)與接收(shou)端信(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)糟合而(er)造(zao)成分(fen)(fen)(fen)(fen)頻(pin)(pin)或干(gan)擾(rao)(rao)(rao)(rao)(rao)(例(li)如在(zai)(zai)(zai)(zai)使(shi)用(yong)(yong)(yong)室(shi)外電話時) 。而(er)采(cai)(cai)用(yong)(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)技術的(de)(de)(de)無線(xian)對講系統由于發(fa)(fa)(fa)射(she)功(gong)(gong)率(lv)(lv)小(xiao)，分(fen)(fen)(fen)(fen)頻(pin)(pin)后的(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)強(qiang)度(du)(du)比有(you)線(xian)對講系統高很多(在(zai)(zai)(zai)(zai)實(shi)際使(shi)用(yong)(yong)(yong)中分(fen)(fen)(fen)(fen)頻(pin)(pin)設備一般(ban)可以將系統信(xin)(xin)號(hao)(hao)(hao)分(fen)(fen)(fen)(fen)頻(pin)(pin)到50dB以上),信(xin)(xin)號(hao)(hao)(hao)不受干(gan)擾(rao)(rao)(rao)(rao)(rao)。如果采(cai)(cai)用(yong)(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)技術，需(xu)要(yao)在(zai)(zai)(zai)(zai)較大的(de)(de)(de)回波功(gong)(gong)率(lv)(lv)下(xia)才能(neng)實(shi)現(xian)信(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)分(fen)(fen)(fen)(fen)頻(pin)(pin)工(gong)作(如分(fen)(fen)(fen)(fen)頻(pin)(pin)器發(fa)(fa)(fa)射(she)信(xin)(xin)號(hao)(hao)(hao)與接收(shou)信(xin)(xin)號(hao)(hao)(hao)重疊時產生(sheng)的(de)(de)(de)千擾(rao)(rao)(rao)(rao)(rao))和發(fa)(fa)(fa)送信(xin)(xin)號(hao)(hao)(hao)強(qiang)度(du)(du)降低(同頻(pin)(pin)帶內的(de)(de)(de)兩只(zhi)天線(xian)對同一信(xin)(xin)道傳輸的(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)強(qiang)度(du)(du)基本一致);如果采(cai)(cai)用(yong)(yong)(yong)混響技術，則可以實(shi)現(xian)對無線(xian)信(xin)(xin)號(hao)(hao)(hao)干(gan)擾(rao)(rao)(rao)(rao)(rao)的(de)(de)(de)抑制或降低。