由于(yu)在(zai)戶(hu)(hu)外、室內等區域，無(wu)線(xian)(xian)對(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)的(de)(de)信(xin)(xin)號強度較弱，而且(qie)采(cai)用(yong)(yong)頻率調制(zhi)技術（如(ru)(ru) MHZ、 NMR、 BSI等）產(chan)生的(de)(de)信(xin)(xin)號傳輸時(shi)(shi)延大，傳輸距(ju)離(li)(li)遠。因此有(you)(you)(you)線(xian)(xian)對(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)不適合在(zai)戶(hu)(hu)外環境使(shi)用(yong)(yong)，特(te)別(bie)(bie)是在(zai)冬(dong)天及低風速季節(jie)(jie)使(shi)用(yong)(yong)。雖(sui)然(ran)無(wu)線(xian)(xian)對(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)也有(you)(you)(you)著(zhu)不錯(cuo)的(de)(de)效(xiao)果。但由于(yu)系(xi)統(tong)(tong)(tong)工作時(shi)(shi)會有(you)(you)(you)一(yi)定(ding)的(de)(de)干擾，使(shi)對(dui)講(jiang)(jiang)(jiang)效(xiao)果下降，另(ling)外在(zai)信(xin)(xin)號較弱時(shi)(shi)對(dui)用(yong)(yong)戶(hu)(hu)語音(yin)產(chan)生了(le)影響。特(te)別(bie)(bie)是在(zai)人員復雜、通信(xin)(xin)距(ju)離(li)(li)較短或需要(yao)較長時(shi)(shi)間使(shi)用(yong)(yong)時(shi)(shi)。因此，更需要(yao)有(you)(you)(you)一(yi)個可靠的(de)(de)無(wu)線(xian)(xian)對(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)提(ti)供與有(you)(you)(you)線(xian)(xian)對(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)一(yi)樣的(de)(de)語音(yin)信(xin)(xin)息與控制(zhi)。無(wu)線(xian)(xian)對(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)具有(you)(you)(you)很高的(de)(de)靈活性，它(ta)能(neng)夠滿足現場中(zhong)所有(you)(you)(you)環境使(shi)用(yong)(yong)需求并能(neng)隨時(shi)(shi)切換（如(ru)(ru)在(zai)野外、戶(hu)(hu)外電話(hua)等),用(yong)(yong)戶(hu)(hu)可以在(zai)任何地點使(shi)用(yong)(yong)、隨時(shi)(shi)、隨地進行通訊。使(shi)用(yong)(yong)方便、節(jie)(jie)省(sheng)成本、節(jie)(jie)約費用(yong)(yong)。下面(mian)我們(men)來了(le)解一(yi)下無(wu)線(xian)(xian)對(dui)講(jiang)(jiang)(jiang)系(xi)統(tong)(tong)(tong)它(ta)主要(yao)是什么優(you)點？

1.性(xing)能穩定，可(ke)靠性(xing)高(gao)

在相同(tong)無(wu)(wu)(wu)線(xian)(xian)(xian)(xian)(xian)傳輸距(ju)離下，無(wu)(wu)(wu)線(xian)(xian)(xian)(xian)(xian)傳輸信(xin)(xin)號(hao)更穩定由(you)于(yu)使(shi)用了功率放(fang)大器(qi)來(lai)對(dui)(dui)無(wu)(wu)(wu)線(xian)(xian)(xian)(xian)(xian)信(xin)(xin)號(hao)進行(xing)壓縮和(he)(he)放(fang)大，使(shi)無(wu)(wu)(wu)線(xian)(xian)(xian)(xian)(xian)信(xin)(xin)號(hao)更加穩定可(ke)靠(kao)。無(wu)(wu)(wu)線(xian)(xian)(xian)(xian)(xian)信(xin)(xin)號(hao)在弱(ruo)電磁環境下也能(neng)(neng)(neng)(neng)保(bao)持較好的(de)(de)性(xing)能(neng)(neng)(neng)(neng)。無(wu)(wu)(wu)線(xian)(xian)(xian)(xian)(xian)對(dui)(dui)講(jiang)系(xi)統具有發(fa)射功率小、抗千擾(rao)能(neng)(neng)(neng)(neng)力(li)強(與(yu)有線(xian)(xian)(xian)(xian)(xian)對(dui)(dui)講(jiang)系(xi)統比較)和(he)(he)抗電磁干擾(rao)能(neng)(neng)(neng)(neng)力(li)強(與(yu)有線(xian)(xian)(xian)(xian)(xian)對(dui)(dui)講(jiang)系(xi)統比較)的(de)(de)特點。無(wu)(wu)(wu)線(xian)(xian)(xian)(xian)(xian)對(dui)(dui)講(jiang)系(xi)統發(fa)射信(xin)(xin)號(hao)在發(fa)射前和(he)(he)發(fa)射后均能(neng)(neng)(neng)(neng)保(bao)持良(liang)好的(de)(de)性(xing)能(neng)(neng)(neng)(neng)，使(shi)用過程中，發(fa)射信(xin)(xin)號(hao)與(yu)接收信(xin)(xin)號(hao)完全不受(shou)任何千擾(rao)，可(ke)保(bao)持很(hen)好的(de)(de)穩定性(xing)，具有良(liang)好的(de)(de)抗千擾(rao)性(xing)和(he)(he)抗低(di)頻干擾(rao)能(neng)(neng)(neng)(neng)力(li)，即使(shi)在惡劣的(de)(de)環境下也能(neng)(neng)(neng)(neng)保(bao)持較好的(de)(de)性(xing)能(neng)(neng)(neng)(neng)。因此(ci)無(wu)(wu)(wu)線(xian)(xian)(xian)(xian)(xian)系(xi)統有較高的(de)(de)可(ke)靠(kao)性(xing)。

2.功耗小、不受(shou)天氣、濕度的(de)影響

無線(xian)(xian)對(dui)講系統在不同(tong)的(de)環境(jing)(jing)中(zhong)，無線(xian)(xian)通信設備和有線(xian)(xian)通信設備一樣都要(yao)進行電(dian)(dian)能(neng)的(de)消耗。當環境(jing)(jing)溫度(du)在-40°C以下時(shi)，無線(xian)(xian)通信設備需要(yao)每(mei)天工作8小(xiao)時(shi)左右(you)(you);當環境(jing)(jing)溫度(du)為(wei)-20°C時(shi)，每(mei)天工作8小(xiao)時(shi)左右(you)(you);當環境(jing)(jing)溫度(du)為(wei)-30°C時(shi)，每(mei)天工作4小(xiao)時(shi)左右(you)(you)。目前(qian)市場(chang)上常見的(de)無線(xian)(xian)對(dui)講系統有兩種電(dian)(dian)源(yuan)輸入(ru)方(fang)式，一種是電(dian)(dian)源(yuan)輸入(ru)，另(ling)一種是電(dian)(dian)源(yuan)輸出。從這兩種方(fang)式對(dui)系統的(de)功(gong)耗來看，電(dian)(dian)源(yuan)輸入(ru)方(fang)式的(de)功(gong)耗更大一些，但是功(gong)耗很小(xiao)。并且設備的(de)工作環境(jing)(jing)不同(tong)，對(dui)電(dian)(dian)池的(de)需求量也不同(tong)，所以功(gong)耗也不同(tong)。

3信號不受干擾

在(zai)一些(xie)有(you)干(gan)擾(rao)(rao)的(de)(de)(de)(de)地(di)方(fang)，例如(ru)(ru)野外、機場、工廠等，一般采(cai)(cai)用分(fen)(fen)(fen)頻(pin)(pin)(pin)方(fang)式(shi)(shi)。分(fen)(fen)(fen)頻(pin)(pin)(pin)方(fang)式(shi)(shi)的(de)(de)(de)(de)抗干(gan)擾(rao)(rao)能力(li)不強(qiang)(qiang)，其抗干(gan)擾(rao)(rao)能力(li)主要取決于射(she)(she)頻(pin)(pin)(pin)功率(lv)的(de)(de)(de)(de)大小(xiao)(xiao)。分(fen)(fen)(fen)頻(pin)(pin)(pin)技(ji)術的(de)(de)(de)(de)功率(lv)一般是50dB在(zai)50dB左右時(shi)(shi)，其抗干(gan)擾(rao)(rao)能力(li)強(qiang)(qiang)。但(dan)由于分(fen)(fen)(fen)頻(pin)(pin)(pin)的(de)(de)(de)(de)干(gan)擾(rao)(rao)與噪聲(sheng)(主要是周(zhou)邊噪聲(sheng))具有(you)很強(qiang)(qiang)的(de)(de)(de)(de)互通(tong)性(xing)，當分(fen)(fen)(fen)頻(pin)(pin)(pin)發(fa)射(she)(she)的(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)超過50dB時(shi)(shi)，其抗千(qian)擾(rao)(rao)能力(li)就會減弱。另外，在(zai)一些(xie)有(you)噪音的(de)(de)(de)(de)環境中(zhong)使(shi)用分(fen)(fen)(fen)頻(pin)(pin)(pin)技(ji)術，會使(shi)分(fen)(fen)(fen)頻(pin)(pin)(pin)信(xin)(xin)號(hao)(hao)無法(fa)到達發(fa)射(she)(she)端的(de)(de)(de)(de)接(jie)(jie)(jie)收(shou)機或(huo)者造(zao)成發(fa)射(she)(she)端信(xin)(xin)號(hao)(hao)與接(jie)(jie)(jie)收(shou)端信(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)糟(zao)合而(er)造(zao)成分(fen)(fen)(fen)頻(pin)(pin)(pin)或(huo)干(gan)擾(rao)(rao)(例如(ru)(ru)在(zai)使(shi)用室外電話時(shi)(shi)) 。而(er)采(cai)(cai)用分(fen)(fen)(fen)頻(pin)(pin)(pin)技(ji)術的(de)(de)(de)(de)無線(xian)對(dui)(dui)講系(xi)(xi)統由于發(fa)射(she)(she)功率(lv)小(xiao)(xiao)，分(fen)(fen)(fen)頻(pin)(pin)(pin)后的(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)強(qiang)(qiang)度比有(you)線(xian)對(dui)(dui)講系(xi)(xi)統高很多(在(zai)實際使(shi)用中(zhong)分(fen)(fen)(fen)頻(pin)(pin)(pin)設備一般可以(yi)將(jiang)系(xi)(xi)統信(xin)(xin)號(hao)(hao)分(fen)(fen)(fen)頻(pin)(pin)(pin)到50dB以(yi)上),信(xin)(xin)號(hao)(hao)不受(shou)干(gan)擾(rao)(rao)。如(ru)(ru)果采(cai)(cai)用分(fen)(fen)(fen)頻(pin)(pin)(pin)技(ji)術，需要在(zai)較大的(de)(de)(de)(de)回(hui)波功率(lv)下才能實現信(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)分(fen)(fen)(fen)頻(pin)(pin)(pin)工作(如(ru)(ru)分(fen)(fen)(fen)頻(pin)(pin)(pin)器發(fa)射(she)(she)信(xin)(xin)號(hao)(hao)與接(jie)(jie)(jie)收(shou)信(xin)(xin)號(hao)(hao)重疊(die)時(shi)(shi)產生(sheng)的(de)(de)(de)(de)千(qian)擾(rao)(rao))和發(fa)送信(xin)(xin)號(hao)(hao)強(qiang)(qiang)度降低(同(tong)頻(pin)(pin)(pin)帶內(nei)的(de)(de)(de)(de)兩(liang)只(zhi)天(tian)線(xian)對(dui)(dui)同(tong)一信(xin)(xin)道(dao)傳輸(shu)的(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)強(qiang)(qiang)度基本(ben)一致);如(ru)(ru)果采(cai)(cai)用混響技(ji)術，則可以(yi)實現對(dui)(dui)無線(xian)信(xin)(xin)號(hao)(hao)干(gan)擾(rao)(rao)的(de)(de)(de)(de)抑制或(huo)降低。