由(you)于(yu)在(zai)戶外(wai)、室(shi)內(nei)等區域，無(wu)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)統(tong)的信號(hao)強度較弱，而(er)且采用(yong)(yong)(yong)頻率調制(zhi)(zhi)技術（如 MHZ、 NMR、 BSI等）產生(sheng)的信號(hao)傳輸時延(yan)大，傳輸距離遠(yuan)。因此(ci)有(you)(you)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)統(tong)不適合在(zai)戶外(wai)環(huan)境使(shi)用(yong)(yong)(yong)，特別(bie)是(shi)(shi)在(zai)冬天及低(di)風速(su)季(ji)節使(shi)用(yong)(yong)(yong)。雖然無(wu)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)統(tong)也有(you)(you)著(zhu)不錯的效(xiao)(xiao)果。但由(you)于(yu)系(xi)統(tong)工作時會有(you)(you)一(yi)定的干(gan)擾，使(shi)對(dui)(dui)講(jiang)效(xiao)(xiao)果下降，另外(wai)在(zai)信號(hao)較弱時對(dui)(dui)用(yong)(yong)(yong)戶語音產生(sheng)了(le)影響。特別(bie)是(shi)(shi)在(zai)人(ren)員復雜(za)、通信距離較短或(huo)需(xu)(xu)要較長時間使(shi)用(yong)(yong)(yong)時。因此(ci)，更(geng)需(xu)(xu)要有(you)(you)一(yi)個可靠的無(wu)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)統(tong)提供與有(you)(you)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)統(tong)一(yi)樣的語音信息(xi)與控制(zhi)(zhi)。無(wu)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)統(tong)具有(you)(you)很高的靈活性，它能夠滿足現場中(zhong)所(suo)有(you)(you)環(huan)境使(shi)用(yong)(yong)(yong)需(xu)(xu)求(qiu)并能隨(sui)時切換(huan)（如在(zai)野外(wai)、戶外(wai)電話等),用(yong)(yong)(yong)戶可以在(zai)任(ren)何(he)地點使(shi)用(yong)(yong)(yong)、隨(sui)時、隨(sui)地進行通訊。使(shi)用(yong)(yong)(yong)方便、節省成本、節約費用(yong)(yong)(yong)。下面我們來了(le)解(jie)一(yi)下無(wu)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)統(tong)它主要是(shi)(shi)什么(me)優點？

1.性能穩定，可靠性高

在相同(tong)無(wu)(wu)線(xian)傳輸距離(li)下，無(wu)(wu)線(xian)傳輸信號(hao)(hao)(hao)更(geng)(geng)穩(wen)定(ding)由于(yu)使(shi)用(yong)了功率(lv)(lv)放(fang)大(da)器來對(dui)無(wu)(wu)線(xian)信號(hao)(hao)(hao)進(jin)行壓(ya)縮和放(fang)大(da)，使(shi)無(wu)(wu)線(xian)信號(hao)(hao)(hao)更(geng)(geng)加穩(wen)定(ding)可靠。無(wu)(wu)線(xian)信號(hao)(hao)(hao)在弱電磁環境下也(ye)能(neng)(neng)(neng)保(bao)持(chi)較(jiao)好(hao)(hao)(hao)(hao)的(de)(de)性(xing)能(neng)(neng)(neng)。無(wu)(wu)線(xian)對(dui)講系(xi)(xi)統具有(you)發射(she)功率(lv)(lv)小、抗(kang)(kang)千(qian)(qian)擾(rao)能(neng)(neng)(neng)力(li)強(與(yu)有(you)線(xian)對(dui)講系(xi)(xi)統比較(jiao))和抗(kang)(kang)電磁干(gan)擾(rao)能(neng)(neng)(neng)力(li)強(與(yu)有(you)線(xian)對(dui)講系(xi)(xi)統比較(jiao))的(de)(de)特(te)點。無(wu)(wu)線(xian)對(dui)講系(xi)(xi)統發射(she)信號(hao)(hao)(hao)在發射(she)前和發射(she)后均能(neng)(neng)(neng)保(bao)持(chi)良(liang)好(hao)(hao)(hao)(hao)的(de)(de)性(xing)能(neng)(neng)(neng)，使(shi)用(yong)過(guo)程中，發射(she)信號(hao)(hao)(hao)與(yu)接(jie)收信號(hao)(hao)(hao)完全不(bu)受任何(he)千(qian)(qian)擾(rao)，可保(bao)持(chi)很(hen)好(hao)(hao)(hao)(hao)的(de)(de)穩(wen)定(ding)性(xing)，具有(you)良(liang)好(hao)(hao)(hao)(hao)的(de)(de)抗(kang)(kang)千(qian)(qian)擾(rao)性(xing)和抗(kang)(kang)低頻干(gan)擾(rao)能(neng)(neng)(neng)力(li)，即使(shi)在惡劣的(de)(de)環境下也(ye)能(neng)(neng)(neng)保(bao)持(chi)較(jiao)好(hao)(hao)(hao)(hao)的(de)(de)性(xing)能(neng)(neng)(neng)。因(yin)此(ci)無(wu)(wu)線(xian)系(xi)(xi)統有(you)較(jiao)高的(de)(de)可靠性(xing)。

2.功耗(hao)小、不受天氣(qi)、濕(shi)度的影響

無(wu)(wu)線對(dui)(dui)講系統(tong)(tong)(tong)在不(bu)(bu)(bu)同的(de)環(huan)境(jing)(jing)中，無(wu)(wu)線通(tong)信設(she)備和(he)有線通(tong)信設(she)備一(yi)樣(yang)都要(yao)(yao)進行電(dian)能的(de)消(xiao)耗(hao)。當(dang)環(huan)境(jing)(jing)溫度在-40°C以(yi)下時(shi)，無(wu)(wu)線通(tong)信設(she)備需(xu)要(yao)(yao)每天工作(zuo)8小(xiao)時(shi)左(zuo)右(you);當(dang)環(huan)境(jing)(jing)溫度為-20°C時(shi)，每天工作(zuo)8小(xiao)時(shi)左(zuo)右(you);當(dang)環(huan)境(jing)(jing)溫度為-30°C時(shi)，每天工作(zuo)4小(xiao)時(shi)左(zuo)右(you)。目前(qian)市場上常(chang)見的(de)無(wu)(wu)線對(dui)(dui)講系統(tong)(tong)(tong)有兩種(zhong)電(dian)源(yuan)輸(shu)(shu)入(ru)方式(shi)(shi)，一(yi)種(zhong)是電(dian)源(yuan)輸(shu)(shu)入(ru)，另一(yi)種(zhong)是電(dian)源(yuan)輸(shu)(shu)出(chu)。從這兩種(zhong)方式(shi)(shi)對(dui)(dui)系統(tong)(tong)(tong)的(de)功耗(hao)來看(kan)，電(dian)源(yuan)輸(shu)(shu)入(ru)方式(shi)(shi)的(de)功耗(hao)更大一(yi)些，但是功耗(hao)很小(xiao)。并且(qie)設(she)備的(de)工作(zuo)環(huan)境(jing)(jing)不(bu)(bu)(bu)同，對(dui)(dui)電(dian)池的(de)需(xu)求量也不(bu)(bu)(bu)同，所以(yi)功耗(hao)也不(bu)(bu)(bu)同。

3信號不受干擾

在(zai)一(yi)些有(you)(you)(you)干(gan)(gan)(gan)擾的(de)(de)(de)地(di)方，例如(ru)野外、機場(chang)、工(gong)廠等，一(yi)般采用(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)方式。分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)方式的(de)(de)(de)抗(kang)干(gan)(gan)(gan)擾能(neng)力(li)不強(qiang)(qiang)，其抗(kang)干(gan)(gan)(gan)擾能(neng)力(li)主要取決于射頻(pin)(pin)(pin)功率的(de)(de)(de)大小。分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)功率一(yi)般是50dB在(zai)50dB左右(you)時(shi)(shi)，其抗(kang)干(gan)(gan)(gan)擾能(neng)力(li)強(qiang)(qiang)。但由(you)于分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)的(de)(de)(de)干(gan)(gan)(gan)擾與噪(zao)聲(主要是周邊噪(zao)聲)具有(you)(you)(you)很強(qiang)(qiang)的(de)(de)(de)互通性，當分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)發(fa)射的(de)(de)(de)信(xin)(xin)(xin)號(hao)超過(guo)50dB時(shi)(shi)，其抗(kang)千擾能(neng)力(li)就(jiu)會減弱。另外，在(zai)一(yi)些有(you)(you)(you)噪(zao)音的(de)(de)(de)環境中使(shi)(shi)用(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)，會使(shi)(shi)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)信(xin)(xin)(xin)號(hao)無(wu)(wu)法到達發(fa)射端(duan)(duan)的(de)(de)(de)接收(shou)機或者造成發(fa)射端(duan)(duan)信(xin)(xin)(xin)號(hao)與接收(shou)端(duan)(duan)信(xin)(xin)(xin)號(hao)的(de)(de)(de)糟合而(er)造成分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)或干(gan)(gan)(gan)擾(例如(ru)在(zai)使(shi)(shi)用(yong)(yong)室(shi)外電話(hua)時(shi)(shi)) 。而(er)采用(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)無(wu)(wu)線(xian)對(dui)(dui)講(jiang)系統(tong)由(you)于發(fa)射功率小，分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)后的(de)(de)(de)信(xin)(xin)(xin)號(hao)強(qiang)(qiang)度比有(you)(you)(you)線(xian)對(dui)(dui)講(jiang)系統(tong)高(gao)很多(在(zai)實際使(shi)(shi)用(yong)(yong)中分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)設(she)備(bei)一(yi)般可以(yi)將系統(tong)信(xin)(xin)(xin)號(hao)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)到50dB以(yi)上),信(xin)(xin)(xin)號(hao)不受干(gan)(gan)(gan)擾。如(ru)果(guo)采用(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)，需要在(zai)較大的(de)(de)(de)回波功率下(xia)才能(neng)實現信(xin)(xin)(xin)號(hao)的(de)(de)(de)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)工(gong)作(如(ru)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)器發(fa)射信(xin)(xin)(xin)號(hao)與接收(shou)信(xin)(xin)(xin)號(hao)重(zhong)疊時(shi)(shi)產生的(de)(de)(de)千擾)和發(fa)送(song)信(xin)(xin)(xin)號(hao)強(qiang)(qiang)度降(jiang)低(同(tong)(tong)頻(pin)(pin)(pin)帶內的(de)(de)(de)兩只(zhi)天線(xian)對(dui)(dui)同(tong)(tong)一(yi)信(xin)(xin)(xin)道傳輸的(de)(de)(de)信(xin)(xin)(xin)號(hao)強(qiang)(qiang)度基本一(yi)致(zhi));如(ru)果(guo)采用(yong)(yong)混響技(ji)術(shu)，則可以(yi)實現對(dui)(dui)無(wu)(wu)線(xian)信(xin)(xin)(xin)號(hao)干(gan)(gan)(gan)擾的(de)(de)(de)抑制(zhi)或降(jiang)低。