由于在(zai)(zai)戶(hu)外、室(shi)內等區域，無(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)(xi)(xi)統(tong)的信(xin)號(hao)強度較弱(ruo)，而且(qie)采用(yong)頻率調制技術（如(ru) MHZ、 NMR、 BSI等）產(chan)生(sheng)的信(xin)號(hao)傳(chuan)輸時(shi)(shi)延大，傳(chuan)輸距(ju)離遠。因此有(you)線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)(xi)(xi)統(tong)不(bu)適合在(zai)(zai)戶(hu)外環境使(shi)用(yong)，特(te)別是在(zai)(zai)冬天及(ji)低風速季節使(shi)用(yong)。雖(sui)然無(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)(xi)(xi)統(tong)也(ye)有(you)著(zhu)不(bu)錯的效(xiao)果(guo)。但由于系(xi)(xi)(xi)(xi)統(tong)工作時(shi)(shi)會有(you)一(yi)(yi)定的干(gan)擾，使(shi)對(dui)講(jiang)(jiang)效(xiao)果(guo)下(xia)降(jiang)，另外在(zai)(zai)信(xin)號(hao)較弱(ruo)時(shi)(shi)對(dui)用(yong)戶(hu)語音(yin)(yin)產(chan)生(sheng)了影響(xiang)。特(te)別是在(zai)(zai)人員復雜、通(tong)信(xin)距(ju)離較短(duan)或需(xu)(xu)要較長時(shi)(shi)間使(shi)用(yong)時(shi)(shi)。因此，更(geng)需(xu)(xu)要有(you)一(yi)(yi)個可(ke)靠的無(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)(xi)(xi)統(tong)提供與(yu)有(you)線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)(xi)(xi)統(tong)一(yi)(yi)樣的語音(yin)(yin)信(xin)息(xi)與(yu)控制。無(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)(xi)(xi)統(tong)具有(you)很(hen)高的靈活性(xing)，它(ta)能夠滿(man)足現場中(zhong)所有(you)環境使(shi)用(yong)需(xu)(xu)求并能隨時(shi)(shi)切換（如(ru)在(zai)(zai)野外、戶(hu)外電(dian)話等),用(yong)戶(hu)可(ke)以在(zai)(zai)任何地點使(shi)用(yong)、隨時(shi)(shi)、隨地進行通(tong)訊。使(shi)用(yong)方便(bian)、節省成本(ben)、節約費用(yong)。下(xia)面我(wo)們來了解一(yi)(yi)下(xia)無(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)(xi)(xi)統(tong)它(ta)主(zhu)要是什(shen)么(me)優(you)點？

1.性能穩定，可靠(kao)性高

在相(xiang)同無(wu)(wu)(wu)線(xian)(xian)(xian)傳(chuan)輸距離下(xia)，無(wu)(wu)(wu)線(xian)(xian)(xian)傳(chuan)輸信(xin)號更穩(wen)定(ding)(ding)由于使用了功(gong)率放(fang)大(da)器(qi)來對(dui)(dui)無(wu)(wu)(wu)線(xian)(xian)(xian)信(xin)號進(jin)行壓縮和(he)放(fang)大(da)，使無(wu)(wu)(wu)線(xian)(xian)(xian)信(xin)號更加穩(wen)定(ding)(ding)可靠。無(wu)(wu)(wu)線(xian)(xian)(xian)信(xin)號在弱電磁(ci)(ci)環境(jing)下(xia)也(ye)能(neng)保(bao)(bao)持(chi)較(jiao)(jiao)(jiao)好(hao)的(de)(de)性能(neng)。無(wu)(wu)(wu)線(xian)(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)(xi)統(tong)具(ju)有(you)(you)發射(she)(she)(she)功(gong)率小、抗千擾(rao)能(neng)力(li)強(與有(you)(you)線(xian)(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)(xi)統(tong)比較(jiao)(jiao)(jiao))和(he)抗電磁(ci)(ci)干(gan)擾(rao)能(neng)力(li)強(與有(you)(you)線(xian)(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)(xi)統(tong)比較(jiao)(jiao)(jiao))的(de)(de)特點。無(wu)(wu)(wu)線(xian)(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)(xi)統(tong)發射(she)(she)(she)信(xin)號在發射(she)(she)(she)前(qian)和(he)發射(she)(she)(she)后均能(neng)保(bao)(bao)持(chi)良好(hao)的(de)(de)性能(neng)，使用過程中(zhong)，發射(she)(she)(she)信(xin)號與接收信(xin)號完全不受(shou)任何(he)千擾(rao)，可保(bao)(bao)持(chi)很好(hao)的(de)(de)穩(wen)定(ding)(ding)性，具(ju)有(you)(you)良好(hao)的(de)(de)抗千擾(rao)性和(he)抗低頻干(gan)擾(rao)能(neng)力(li)，即使在惡劣(lie)的(de)(de)環境(jing)下(xia)也(ye)能(neng)保(bao)(bao)持(chi)較(jiao)(jiao)(jiao)好(hao)的(de)(de)性能(neng)。因(yin)此無(wu)(wu)(wu)線(xian)(xian)(xian)系(xi)(xi)(xi)統(tong)有(you)(you)較(jiao)(jiao)(jiao)高(gao)的(de)(de)可靠性。

2.功耗小、不(bu)受天(tian)氣、濕度(du)的(de)影響

無(wu)(wu)線(xian)(xian)(xian)對(dui)講(jiang)(jiang)系(xi)統(tong)在(zai)不(bu)(bu)同(tong)的環(huan)境(jing)中，無(wu)(wu)線(xian)(xian)(xian)通信設備和有線(xian)(xian)(xian)通信設備一樣都要進行電(dian)(dian)能的消耗。當(dang)(dang)環(huan)境(jing)溫度(du)(du)在(zai)-40°C以下時(shi)(shi)，無(wu)(wu)線(xian)(xian)(xian)通信設備需要每(mei)天(tian)(tian)工(gong)(gong)作(zuo)(zuo)8小(xiao)時(shi)(shi)左(zuo)右;當(dang)(dang)環(huan)境(jing)溫度(du)(du)為-20°C時(shi)(shi)，每(mei)天(tian)(tian)工(gong)(gong)作(zuo)(zuo)8小(xiao)時(shi)(shi)左(zuo)右;當(dang)(dang)環(huan)境(jing)溫度(du)(du)為-30°C時(shi)(shi)，每(mei)天(tian)(tian)工(gong)(gong)作(zuo)(zuo)4小(xiao)時(shi)(shi)左(zuo)右。目(mu)前市(shi)場上常見的無(wu)(wu)線(xian)(xian)(xian)對(dui)講(jiang)(jiang)系(xi)統(tong)有兩種電(dian)(dian)源(yuan)輸(shu)入(ru)方(fang)(fang)(fang)式(shi)，一種是電(dian)(dian)源(yuan)輸(shu)入(ru)，另一種是電(dian)(dian)源(yuan)輸(shu)出。從(cong)這兩種方(fang)(fang)(fang)式(shi)對(dui)系(xi)統(tong)的功(gong)(gong)耗來(lai)看，電(dian)(dian)源(yuan)輸(shu)入(ru)方(fang)(fang)(fang)式(shi)的功(gong)(gong)耗更(geng)大一些，但是功(gong)(gong)耗很小(xiao)。并且設備的工(gong)(gong)作(zuo)(zuo)環(huan)境(jing)不(bu)(bu)同(tong)，對(dui)電(dian)(dian)池的需求量(liang)也不(bu)(bu)同(tong)，所(suo)以功(gong)(gong)耗也不(bu)(bu)同(tong)。

3信號不受干擾

在(zai)(zai)一(yi)些有干(gan)擾(rao)(rao)(rao)的(de)(de)(de)地(di)方，例如野外(wai)、機(ji)場(chang)、工廠(chang)等，一(yi)般采(cai)(cai)用(yong)(yong)(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)方式(shi)。分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)方式(shi)的(de)(de)(de)抗(kang)(kang)干(gan)擾(rao)(rao)(rao)能(neng)力(li)(li)不(bu)強(qiang)，其(qi)抗(kang)(kang)干(gan)擾(rao)(rao)(rao)能(neng)力(li)(li)主要取決于射(she)(she)頻(pin)(pin)功率(lv)的(de)(de)(de)大小。分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)技術的(de)(de)(de)功率(lv)一(yi)般是50dB在(zai)(zai)50dB左右時，其(qi)抗(kang)(kang)干(gan)擾(rao)(rao)(rao)能(neng)力(li)(li)強(qiang)。但(dan)由于分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)的(de)(de)(de)干(gan)擾(rao)(rao)(rao)與噪聲(主要是周邊噪聲)具(ju)有很強(qiang)的(de)(de)(de)互(hu)通性，當分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)發(fa)射(she)(she)的(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)(hao)超過(guo)50dB時，其(qi)抗(kang)(kang)千擾(rao)(rao)(rao)能(neng)力(li)(li)就會(hui)減弱。另外(wai)，在(zai)(zai)一(yi)些有噪音的(de)(de)(de)環境中(zhong)使用(yong)(yong)(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)技術，會(hui)使分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)信(xin)(xin)號(hao)(hao)(hao)(hao)無(wu)法到(dao)達發(fa)射(she)(she)端(duan)(duan)的(de)(de)(de)接(jie)收機(ji)或者造(zao)成發(fa)射(she)(she)端(duan)(duan)信(xin)(xin)號(hao)(hao)(hao)(hao)與接(jie)收端(duan)(duan)信(xin)(xin)號(hao)(hao)(hao)(hao)的(de)(de)(de)糟合而造(zao)成分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)或干(gan)擾(rao)(rao)(rao)(例如在(zai)(zai)使用(yong)(yong)(yong)(yong)室(shi)外(wai)電話(hua)時) 。而采(cai)(cai)用(yong)(yong)(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)技術的(de)(de)(de)無(wu)線對(dui)講系統(tong)由于發(fa)射(she)(she)功率(lv)小，分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)后的(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)(hao)強(qiang)度(du)比有線對(dui)講系統(tong)高很多(在(zai)(zai)實(shi)(shi)際使用(yong)(yong)(yong)(yong)中(zhong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)設備一(yi)般可以(yi)將系統(tong)信(xin)(xin)號(hao)(hao)(hao)(hao)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)到(dao)50dB以(yi)上),信(xin)(xin)號(hao)(hao)(hao)(hao)不(bu)受干(gan)擾(rao)(rao)(rao)。如果(guo)采(cai)(cai)用(yong)(yong)(yong)(yong)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)技術，需要在(zai)(zai)較大的(de)(de)(de)回波功率(lv)下才(cai)能(neng)實(shi)(shi)現信(xin)(xin)號(hao)(hao)(hao)(hao)的(de)(de)(de)分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)工作(如分(fen)(fen)(fen)(fen)(fen)頻(pin)(pin)器發(fa)射(she)(she)信(xin)(xin)號(hao)(hao)(hao)(hao)與接(jie)收信(xin)(xin)號(hao)(hao)(hao)(hao)重疊時產(chan)生的(de)(de)(de)千擾(rao)(rao)(rao))和發(fa)送信(xin)(xin)號(hao)(hao)(hao)(hao)強(qiang)度(du)降低(同頻(pin)(pin)帶內的(de)(de)(de)兩只天(tian)線對(dui)同一(yi)信(xin)(xin)道傳輸(shu)的(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)(hao)強(qiang)度(du)基本一(yi)致(zhi));如果(guo)采(cai)(cai)用(yong)(yong)(yong)(yong)混響技術，則可以(yi)實(shi)(shi)現對(dui)無(wu)線信(xin)(xin)號(hao)(hao)(hao)(hao)干(gan)擾(rao)(rao)(rao)的(de)(de)(de)抑(yi)制或降低。