由(you)于在(zai)(zai)(zai)戶(hu)外、室(shi)內等(deng)區(qu)域，無(wu)線(xian)(xian)(xian)對講(jiang)(jiang)(jiang)系統(tong)的(de)(de)(de)信號強度較弱(ruo)，而(er)且采(cai)用(yong)(yong)(yong)(yong)頻率調制(zhi)技術（如 MHZ、 NMR、 BSI等(deng)）產(chan)(chan)生的(de)(de)(de)信號傳輸時延大，傳輸距(ju)離(li)遠。因(yin)(yin)此有(you)線(xian)(xian)(xian)對講(jiang)(jiang)(jiang)系統(tong)不(bu)適合在(zai)(zai)(zai)戶(hu)外環境使(shi)用(yong)(yong)(yong)(yong)，特(te)別是在(zai)(zai)(zai)冬天及低風速(su)季節使(shi)用(yong)(yong)(yong)(yong)。雖然無(wu)線(xian)(xian)(xian)對講(jiang)(jiang)(jiang)系統(tong)也有(you)著不(bu)錯的(de)(de)(de)效(xiao)果。但由(you)于系統(tong)工(gong)作時會有(you)一(yi)定的(de)(de)(de)干擾，使(shi)對講(jiang)(jiang)(jiang)效(xiao)果下(xia)降，另外在(zai)(zai)(zai)信號較弱(ruo)時對用(yong)(yong)(yong)(yong)戶(hu)語(yu)音產(chan)(chan)生了(le)影響。特(te)別是在(zai)(zai)(zai)人員復雜、通信距(ju)離(li)較短或需要(yao)較長時間使(shi)用(yong)(yong)(yong)(yong)時。因(yin)(yin)此，更需要(yao)有(you)一(yi)個可靠(kao)的(de)(de)(de)無(wu)線(xian)(xian)(xian)對講(jiang)(jiang)(jiang)系統(tong)提(ti)供與有(you)線(xian)(xian)(xian)對講(jiang)(jiang)(jiang)系統(tong)一(yi)樣的(de)(de)(de)語(yu)音信息與控制(zhi)。無(wu)線(xian)(xian)(xian)對講(jiang)(jiang)(jiang)系統(tong)具有(you)很高(gao)的(de)(de)(de)靈活性，它能夠滿足現場中所有(you)環境使(shi)用(yong)(yong)(yong)(yong)需求(qiu)并能隨時切換（如在(zai)(zai)(zai)野外、戶(hu)外電(dian)話等(deng)),用(yong)(yong)(yong)(yong)戶(hu)可以在(zai)(zai)(zai)任何地點使(shi)用(yong)(yong)(yong)(yong)、隨時、隨地進行通訊(xun)。使(shi)用(yong)(yong)(yong)(yong)方便(bian)、節省成本、節約費用(yong)(yong)(yong)(yong)。下(xia)面我們(men)來了(le)解一(yi)下(xia)無(wu)線(xian)(xian)(xian)對講(jiang)(jiang)(jiang)系統(tong)它主(zhu)要(yao)是什么優點？

1.性(xing)能(neng)穩定(ding)，可靠性(xing)高

在(zai)(zai)相同無(wu)線傳(chuan)輸(shu)距離下，無(wu)線傳(chuan)輸(shu)信(xin)號(hao)(hao)更穩(wen)定(ding)由于使用了功(gong)(gong)率放(fang)大器(qi)來對無(wu)線信(xin)號(hao)(hao)進行(xing)壓縮(suo)和放(fang)大，使無(wu)線信(xin)號(hao)(hao)更加穩(wen)定(ding)可靠。無(wu)線信(xin)號(hao)(hao)在(zai)(zai)弱電磁環(huan)境下也(ye)能(neng)保持(chi)較(jiao)好的(de)(de)(de)性能(neng)。無(wu)線對講(jiang)(jiang)系統(tong)具有(you)發(fa)射(she)功(gong)(gong)率小、抗千(qian)(qian)擾(rao)(rao)(rao)(rao)能(neng)力(li)強(與(yu)有(you)線對講(jiang)(jiang)系統(tong)比較(jiao))和抗電磁干擾(rao)(rao)(rao)(rao)能(neng)力(li)強(與(yu)有(you)線對講(jiang)(jiang)系統(tong)比較(jiao))的(de)(de)(de)特點。無(wu)線對講(jiang)(jiang)系統(tong)發(fa)射(she)信(xin)號(hao)(hao)在(zai)(zai)發(fa)射(she)前和發(fa)射(she)后(hou)均能(neng)保持(chi)良好的(de)(de)(de)性能(neng)，使用過(guo)程中，發(fa)射(she)信(xin)號(hao)(hao)與(yu)接收(shou)信(xin)號(hao)(hao)完全不受任何千(qian)(qian)擾(rao)(rao)(rao)(rao)，可保持(chi)很(hen)好的(de)(de)(de)穩(wen)定(ding)性，具有(you)良好的(de)(de)(de)抗千(qian)(qian)擾(rao)(rao)(rao)(rao)性和抗低頻干擾(rao)(rao)(rao)(rao)能(neng)力(li)，即使在(zai)(zai)惡劣(lie)的(de)(de)(de)環(huan)境下也(ye)能(neng)保持(chi)較(jiao)好的(de)(de)(de)性能(neng)。因此無(wu)線系統(tong)有(you)較(jiao)高(gao)的(de)(de)(de)可靠性。

2.功耗小、不受天氣、濕度(du)的影(ying)響

無(wu)線(xian)對講(jiang)系(xi)(xi)統(tong)(tong)在(zai)不(bu)(bu)同(tong)的環境(jing)(jing)中，無(wu)線(xian)通(tong)信設(she)(she)備和有線(xian)通(tong)信設(she)(she)備一樣(yang)都要(yao)進行電(dian)(dian)能的消耗(hao)。當環境(jing)(jing)溫(wen)度(du)在(zai)-40°C以下時(shi)，無(wu)線(xian)通(tong)信設(she)(she)備需(xu)要(yao)每天工作8小時(shi)左(zuo)(zuo)右(you);當環境(jing)(jing)溫(wen)度(du)為-20°C時(shi)，每天工作8小時(shi)左(zuo)(zuo)右(you);當環境(jing)(jing)溫(wen)度(du)為-30°C時(shi)，每天工作4小時(shi)左(zuo)(zuo)右(you)。目前市(shi)場上(shang)常見的無(wu)線(xian)對講(jiang)系(xi)(xi)統(tong)(tong)有兩種(zhong)(zhong)(zhong)電(dian)(dian)源(yuan)輸(shu)入(ru)方(fang)式(shi)，一種(zhong)(zhong)(zhong)是(shi)電(dian)(dian)源(yuan)輸(shu)入(ru)，另(ling)一種(zhong)(zhong)(zhong)是(shi)電(dian)(dian)源(yuan)輸(shu)出。從這兩種(zhong)(zhong)(zhong)方(fang)式(shi)對系(xi)(xi)統(tong)(tong)的功(gong)耗(hao)來看，電(dian)(dian)源(yuan)輸(shu)入(ru)方(fang)式(shi)的功(gong)耗(hao)更大(da)一些，但是(shi)功(gong)耗(hao)很小。并且(qie)設(she)(she)備的工作環境(jing)(jing)不(bu)(bu)同(tong)，對電(dian)(dian)池的需(xu)求(qiu)量也(ye)不(bu)(bu)同(tong)，所以功(gong)耗(hao)也(ye)不(bu)(bu)同(tong)。

3信號不受干擾

在(zai)(zai)一(yi)(yi)些有(you)干(gan)(gan)擾(rao)(rao)(rao)的(de)(de)(de)地方(fang)(fang)，例如(ru)野(ye)外、機(ji)場、工廠等，一(yi)(yi)般(ban)采用(yong)(yong)(yong)(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)(de)抗干(gan)(gan)擾(rao)(rao)(rao)能(neng)力不(bu)強(qiang)(qiang)，其(qi)(qi)抗干(gan)(gan)擾(rao)(rao)(rao)能(neng)力主(zhu)要取(qu)決于(yu)射(she)(she)頻(pin)(pin)(pin)功率的(de)(de)(de)大小。分(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)功率一(yi)(yi)般(ban)是50dB在(zai)(zai)50dB左(zuo)右時(shi)，其(qi)(qi)抗干(gan)(gan)擾(rao)(rao)(rao)能(neng)力強(qiang)(qiang)。但(dan)由于(yu)分(fen)(fen)頻(pin)(pin)(pin)的(de)(de)(de)干(gan)(gan)擾(rao)(rao)(rao)與(yu)噪聲(主(zhu)要是周邊噪聲)具(ju)有(you)很(hen)強(qiang)(qiang)的(de)(de)(de)互通性，當分(fen)(fen)頻(pin)(pin)(pin)發射(she)(she)的(de)(de)(de)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)超過50dB時(shi)，其(qi)(qi)抗千擾(rao)(rao)(rao)能(neng)力就會減弱。另外，在(zai)(zai)一(yi)(yi)些有(you)噪音的(de)(de)(de)環境(jing)中使(shi)用(yong)(yong)(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)，會使(shi)分(fen)(fen)頻(pin)(pin)(pin)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)無(wu)(wu)法到達發射(she)(she)端(duan)的(de)(de)(de)接(jie)(jie)收(shou)機(ji)或(huo)者造(zao)成發射(she)(she)端(duan)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接(jie)(jie)收(shou)端(duan)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)糟(zao)合而(er)(er)造(zao)成分(fen)(fen)頻(pin)(pin)(pin)或(huo)干(gan)(gan)擾(rao)(rao)(rao)(例如(ru)在(zai)(zai)使(shi)用(yong)(yong)(yong)(yong)室外電(dian)話(hua)時(shi)) 。而(er)(er)采用(yong)(yong)(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)無(wu)(wu)線對講(jiang)系統(tong)(tong)由于(yu)發射(she)(she)功率小，分(fen)(fen)頻(pin)(pin)(pin)后的(de)(de)(de)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)度(du)(du)比有(you)線對講(jiang)系統(tong)(tong)高很(hen)多(在(zai)(zai)實(shi)際使(shi)用(yong)(yong)(yong)(yong)中分(fen)(fen)頻(pin)(pin)(pin)設備(bei)一(yi)(yi)般(ban)可以(yi)將系統(tong)(tong)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)分(fen)(fen)頻(pin)(pin)(pin)到50dB以(yi)上(shang)),信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)不(bu)受(shou)干(gan)(gan)擾(rao)(rao)(rao)。如(ru)果采用(yong)(yong)(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)，需要在(zai)(zai)較(jiao)大的(de)(de)(de)回波(bo)功率下才能(neng)實(shi)現(xian)(xian)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)分(fen)(fen)頻(pin)(pin)(pin)工作(如(ru)分(fen)(fen)頻(pin)(pin)(pin)器發射(she)(she)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接(jie)(jie)收(shou)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)重疊時(shi)產生的(de)(de)(de)千擾(rao)(rao)(rao))和發送信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)度(du)(du)降低(同頻(pin)(pin)(pin)帶(dai)內的(de)(de)(de)兩只天(tian)線對同一(yi)(yi)信(xin)(xin)(xin)(xin)(xin)道(dao)傳輸(shu)的(de)(de)(de)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)度(du)(du)基本一(yi)(yi)致(zhi));如(ru)果采用(yong)(yong)(yong)(yong)混響技(ji)術(shu)，則可以(yi)實(shi)現(xian)(xian)對無(wu)(wu)線信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)干(gan)(gan)擾(rao)(rao)(rao)的(de)(de)(de)抑制或(huo)降低。