由于在(zai)戶(hu)(hu)外(wai)(wai)、室內等區域，無線對(dui)(dui)(dui)講(jiang)系(xi)(xi)統(tong)的(de)信(xin)號(hao)強度較(jiao)弱，而且采用(yong)(yong)頻率調制(zhi)(zhi)技術（如 MHZ、 NMR、 BSI等）產生的(de)信(xin)號(hao)傳(chuan)輸時(shi)(shi)(shi)延大，傳(chuan)輸距離(li)遠。因(yin)此有(you)(you)線對(dui)(dui)(dui)講(jiang)系(xi)(xi)統(tong)不適合在(zai)戶(hu)(hu)外(wai)(wai)環境(jing)使(shi)(shi)用(yong)(yong)，特(te)別(bie)是(shi)在(zai)冬天及低風(feng)速(su)季(ji)節(jie)使(shi)(shi)用(yong)(yong)。雖然無線對(dui)(dui)(dui)講(jiang)系(xi)(xi)統(tong)也有(you)(you)著不錯的(de)效(xiao)果。但由于系(xi)(xi)統(tong)工(gong)作(zuo)時(shi)(shi)(shi)會有(you)(you)一(yi)(yi)定的(de)干擾，使(shi)(shi)對(dui)(dui)(dui)講(jiang)效(xiao)果下降，另外(wai)(wai)在(zai)信(xin)號(hao)較(jiao)弱時(shi)(shi)(shi)對(dui)(dui)(dui)用(yong)(yong)戶(hu)(hu)語(yu)音產生了(le)影響。特(te)別(bie)是(shi)在(zai)人員(yuan)復雜、通信(xin)距離(li)較(jiao)短或(huo)需要較(jiao)長時(shi)(shi)(shi)間(jian)使(shi)(shi)用(yong)(yong)時(shi)(shi)(shi)。因(yin)此，更需要有(you)(you)一(yi)(yi)個可靠的(de)無線對(dui)(dui)(dui)講(jiang)系(xi)(xi)統(tong)提供與有(you)(you)線對(dui)(dui)(dui)講(jiang)系(xi)(xi)統(tong)一(yi)(yi)樣的(de)語(yu)音信(xin)息與控制(zhi)(zhi)。無線對(dui)(dui)(dui)講(jiang)系(xi)(xi)統(tong)具有(you)(you)很高的(de)靈活性(xing)，它(ta)能夠(gou)滿足現場中所有(you)(you)環境(jing)使(shi)(shi)用(yong)(yong)需求并能隨(sui)時(shi)(shi)(shi)切換（如在(zai)野(ye)外(wai)(wai)、戶(hu)(hu)外(wai)(wai)電話等),用(yong)(yong)戶(hu)(hu)可以在(zai)任何地點(dian)使(shi)(shi)用(yong)(yong)、隨(sui)時(shi)(shi)(shi)、隨(sui)地進(jin)行通訊。使(shi)(shi)用(yong)(yong)方便(bian)、節(jie)省(sheng)成(cheng)本、節(jie)約(yue)費(fei)用(yong)(yong)。下面我們來了(le)解一(yi)(yi)下無線對(dui)(dui)(dui)講(jiang)系(xi)(xi)統(tong)它(ta)主要是(shi)什(shen)么優(you)點(dian)？

1.性(xing)能(neng)穩定，可靠性(xing)高

在(zai)相(xiang)同無(wu)線(xian)(xian)(xian)傳(chuan)輸距離下，無(wu)線(xian)(xian)(xian)傳(chuan)輸信(xin)號(hao)更(geng)穩定由于使(shi)用(yong)了功(gong)率放大(da)器來對(dui)(dui)(dui)無(wu)線(xian)(xian)(xian)信(xin)號(hao)進行(xing)壓縮和放大(da)，使(shi)無(wu)線(xian)(xian)(xian)信(xin)號(hao)更(geng)加穩定可(ke)靠(kao)。無(wu)線(xian)(xian)(xian)信(xin)號(hao)在(zai)弱(ruo)電(dian)磁環境下也能(neng)(neng)(neng)保(bao)(bao)持(chi)較(jiao)好(hao)(hao)的(de)(de)性能(neng)(neng)(neng)。無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)具(ju)有(you)發(fa)射功(gong)率小、抗千(qian)擾(rao)(rao)能(neng)(neng)(neng)力(li)強(與(yu)有(you)線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)比較(jiao))和抗電(dian)磁干擾(rao)(rao)能(neng)(neng)(neng)力(li)強(與(yu)有(you)線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)比較(jiao))的(de)(de)特點。無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)發(fa)射信(xin)號(hao)在(zai)發(fa)射前和發(fa)射后均能(neng)(neng)(neng)保(bao)(bao)持(chi)良(liang)好(hao)(hao)的(de)(de)性能(neng)(neng)(neng)，使(shi)用(yong)過程中，發(fa)射信(xin)號(hao)與(yu)接收信(xin)號(hao)完全不受任何千(qian)擾(rao)(rao)，可(ke)保(bao)(bao)持(chi)很好(hao)(hao)的(de)(de)穩定性，具(ju)有(you)良(liang)好(hao)(hao)的(de)(de)抗千(qian)擾(rao)(rao)性和抗低頻干擾(rao)(rao)能(neng)(neng)(neng)力(li)，即使(shi)在(zai)惡劣的(de)(de)環境下也能(neng)(neng)(neng)保(bao)(bao)持(chi)較(jiao)好(hao)(hao)的(de)(de)性能(neng)(neng)(neng)。因此無(wu)線(xian)(xian)(xian)系(xi)統(tong)有(you)較(jiao)高的(de)(de)可(ke)靠(kao)性。

2.功(gong)耗小、不受(shou)天(tian)氣、濕(shi)度的(de)影響

無(wu)(wu)線(xian)對(dui)(dui)講系統(tong)在不同(tong)(tong)的環(huan)境中，無(wu)(wu)線(xian)通(tong)信(xin)設(she)(she)備和有線(xian)通(tong)信(xin)設(she)(she)備一(yi)樣(yang)都要(yao)進行電能的消耗。當(dang)環(huan)境溫(wen)度在-40°C以下(xia)時(shi)(shi)，無(wu)(wu)線(xian)通(tong)信(xin)設(she)(she)備需要(yao)每天工(gong)作8小時(shi)(shi)左(zuo)右;當(dang)環(huan)境溫(wen)度為-20°C時(shi)(shi)，每天工(gong)作8小時(shi)(shi)左(zuo)右;當(dang)環(huan)境溫(wen)度為-30°C時(shi)(shi)，每天工(gong)作4小時(shi)(shi)左(zuo)右。目前市場上常見的無(wu)(wu)線(xian)對(dui)(dui)講系統(tong)有兩種(zhong)(zhong)電源(yuan)輸入方(fang)(fang)式，一(yi)種(zhong)(zhong)是(shi)電源(yuan)輸入，另(ling)一(yi)種(zhong)(zhong)是(shi)電源(yuan)輸出。從這兩種(zhong)(zhong)方(fang)(fang)式對(dui)(dui)系統(tong)的功耗來看，電源(yuan)輸入方(fang)(fang)式的功耗更大一(yi)些，但是(shi)功耗很小。并且設(she)(she)備的工(gong)作環(huan)境不同(tong)(tong)，對(dui)(dui)電池的需求量也(ye)不同(tong)(tong)，所以功耗也(ye)不同(tong)(tong)。

3信號不受干擾

在(zai)一(yi)(yi)些(xie)有(you)干(gan)(gan)(gan)擾(rao)(rao)(rao)的(de)(de)(de)地(di)方(fang)，例如(ru)野(ye)外、機場、工(gong)廠等(deng)，一(yi)(yi)般(ban)采用(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)方(fang)式。分(fen)(fen)頻(pin)(pin)(pin)方(fang)式的(de)(de)(de)抗(kang)(kang)干(gan)(gan)(gan)擾(rao)(rao)(rao)能(neng)(neng)力不強(qiang)，其(qi)(qi)抗(kang)(kang)干(gan)(gan)(gan)擾(rao)(rao)(rao)能(neng)(neng)力主(zhu)要(yao)取決于(yu)射(she)頻(pin)(pin)(pin)功(gong)(gong)率(lv)的(de)(de)(de)大小(xiao)。分(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)功(gong)(gong)率(lv)一(yi)(yi)般(ban)是50dB在(zai)50dB左右(you)時(shi)(shi)，其(qi)(qi)抗(kang)(kang)干(gan)(gan)(gan)擾(rao)(rao)(rao)能(neng)(neng)力強(qiang)。但由于(yu)分(fen)(fen)頻(pin)(pin)(pin)的(de)(de)(de)干(gan)(gan)(gan)擾(rao)(rao)(rao)與噪聲(主(zhu)要(yao)是周邊噪聲)具有(you)很強(qiang)的(de)(de)(de)互通性，當(dang)分(fen)(fen)頻(pin)(pin)(pin)發(fa)(fa)射(she)的(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)超過50dB時(shi)(shi)，其(qi)(qi)抗(kang)(kang)千擾(rao)(rao)(rao)能(neng)(neng)力就會(hui)減弱(ruo)。另外，在(zai)一(yi)(yi)些(xie)有(you)噪音的(de)(de)(de)環境中使(shi)用(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)，會(hui)使(shi)分(fen)(fen)頻(pin)(pin)(pin)信(xin)(xin)(xin)(xin)號(hao)(hao)無(wu)法(fa)到達(da)發(fa)(fa)射(she)端(duan)的(de)(de)(de)接(jie)收(shou)機或(huo)者(zhe)造(zao)成發(fa)(fa)射(she)端(duan)信(xin)(xin)(xin)(xin)號(hao)(hao)與接(jie)收(shou)端(duan)信(xin)(xin)(xin)(xin)號(hao)(hao)的(de)(de)(de)糟(zao)合(he)而造(zao)成分(fen)(fen)頻(pin)(pin)(pin)或(huo)干(gan)(gan)(gan)擾(rao)(rao)(rao)(例如(ru)在(zai)使(shi)用(yong)(yong)室外電話時(shi)(shi)) 。而采用(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)無(wu)線對講系(xi)統由于(yu)發(fa)(fa)射(she)功(gong)(gong)率(lv)小(xiao)，分(fen)(fen)頻(pin)(pin)(pin)后(hou)的(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)強(qiang)度比有(you)線對講系(xi)統高(gao)很多(在(zai)實(shi)際(ji)使(shi)用(yong)(yong)中分(fen)(fen)頻(pin)(pin)(pin)設備一(yi)(yi)般(ban)可以(yi)將系(xi)統信(xin)(xin)(xin)(xin)號(hao)(hao)分(fen)(fen)頻(pin)(pin)(pin)到50dB以(yi)上(shang)),信(xin)(xin)(xin)(xin)號(hao)(hao)不受干(gan)(gan)(gan)擾(rao)(rao)(rao)。如(ru)果采用(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)，需要(yao)在(zai)較大的(de)(de)(de)回波功(gong)(gong)率(lv)下才能(neng)(neng)實(shi)現信(xin)(xin)(xin)(xin)號(hao)(hao)的(de)(de)(de)分(fen)(fen)頻(pin)(pin)(pin)工(gong)作(如(ru)分(fen)(fen)頻(pin)(pin)(pin)器發(fa)(fa)射(she)信(xin)(xin)(xin)(xin)號(hao)(hao)與接(jie)收(shou)信(xin)(xin)(xin)(xin)號(hao)(hao)重疊時(shi)(shi)產生的(de)(de)(de)千擾(rao)(rao)(rao))和發(fa)(fa)送信(xin)(xin)(xin)(xin)號(hao)(hao)強(qiang)度降低(同(tong)頻(pin)(pin)(pin)帶內的(de)(de)(de)兩只(zhi)天線對同(tong)一(yi)(yi)信(xin)(xin)(xin)(xin)道傳(chuan)輸的(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)強(qiang)度基(ji)本(ben)一(yi)(yi)致);如(ru)果采用(yong)(yong)混響技(ji)術(shu)，則可以(yi)實(shi)現對無(wu)線信(xin)(xin)(xin)(xin)號(hao)(hao)干(gan)(gan)(gan)擾(rao)(rao)(rao)的(de)(de)(de)抑制(zhi)或(huo)降低。