由于(yu)在(zai)(zai)戶外(wai)、室內等區域，無線(xian)對(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)的(de)信(xin)(xin)號強(qiang)度較(jiao)弱(ruo)，而(er)且采用(yong)(yong)頻率調制技術（如(ru) MHZ、 NMR、 BSI等）產生(sheng)的(de)信(xin)(xin)號傳輸時延大，傳輸距離遠。因此有(you)(you)(you)線(xian)對(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)不適合在(zai)(zai)戶外(wai)環境使(shi)(shi)(shi)用(yong)(yong)，特(te)別(bie)(bie)是(shi)在(zai)(zai)冬天(tian)及低風(feng)速(su)季節(jie)(jie)使(shi)(shi)(shi)用(yong)(yong)。雖然無線(xian)對(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)也有(you)(you)(you)著不錯的(de)效果。但由于(yu)系(xi)(xi)(xi)統(tong)(tong)(tong)工作時會有(you)(you)(you)一定的(de)干擾，使(shi)(shi)(shi)對(dui)(dui)講(jiang)(jiang)效果下(xia)降(jiang)，另外(wai)在(zai)(zai)信(xin)(xin)號較(jiao)弱(ruo)時對(dui)(dui)用(yong)(yong)戶語音產生(sheng)了影響。特(te)別(bie)(bie)是(shi)在(zai)(zai)人員復雜(za)、通信(xin)(xin)距離較(jiao)短(duan)或(huo)需(xu)要(yao)較(jiao)長時間使(shi)(shi)(shi)用(yong)(yong)時。因此，更需(xu)要(yao)有(you)(you)(you)一個可靠的(de)無線(xian)對(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)提供與有(you)(you)(you)線(xian)對(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)一樣(yang)的(de)語音信(xin)(xin)息(xi)與控制。無線(xian)對(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)具(ju)有(you)(you)(you)很高的(de)靈活性，它能夠滿足現場(chang)中(zhong)所有(you)(you)(you)環境使(shi)(shi)(shi)用(yong)(yong)需(xu)求并(bing)能隨時切換（如(ru)在(zai)(zai)野(ye)外(wai)、戶外(wai)電話等),用(yong)(yong)戶可以在(zai)(zai)任何地點使(shi)(shi)(shi)用(yong)(yong)、隨時、隨地進行通訊(xun)。使(shi)(shi)(shi)用(yong)(yong)方(fang)便、節(jie)(jie)省成本、節(jie)(jie)約費用(yong)(yong)。下(xia)面我們來了解(jie)一下(xia)無線(xian)對(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)它主要(yao)是(shi)什么(me)優(you)點？

1.性能穩定，可靠性高

在相同(tong)無(wu)線(xian)傳輸距離下(xia)，無(wu)線(xian)傳輸信(xin)號(hao)更(geng)穩(wen)定由(you)于使(shi)用(yong)了功率(lv)放(fang)(fang)大(da)器來對(dui)(dui)無(wu)線(xian)信(xin)號(hao)進行(xing)壓縮和放(fang)(fang)大(da)，使(shi)無(wu)線(xian)信(xin)號(hao)更(geng)加穩(wen)定可(ke)(ke)靠。無(wu)線(xian)信(xin)號(hao)在弱電磁環(huan)境(jing)下(xia)也能(neng)(neng)(neng)(neng)保(bao)(bao)持較(jiao)好的(de)(de)(de)性能(neng)(neng)(neng)(neng)。無(wu)線(xian)對(dui)(dui)講系(xi)統(tong)(tong)(tong)具(ju)有(you)發射(she)功率(lv)小(xiao)、抗(kang)(kang)(kang)千擾(rao)(rao)能(neng)(neng)(neng)(neng)力(li)強(與(yu)(yu)有(you)線(xian)對(dui)(dui)講系(xi)統(tong)(tong)(tong)比(bi)較(jiao))和抗(kang)(kang)(kang)電磁干(gan)擾(rao)(rao)能(neng)(neng)(neng)(neng)力(li)強(與(yu)(yu)有(you)線(xian)對(dui)(dui)講系(xi)統(tong)(tong)(tong)比(bi)較(jiao))的(de)(de)(de)特點。無(wu)線(xian)對(dui)(dui)講系(xi)統(tong)(tong)(tong)發射(she)信(xin)號(hao)在發射(she)前和發射(she)后均能(neng)(neng)(neng)(neng)保(bao)(bao)持良好的(de)(de)(de)性能(neng)(neng)(neng)(neng)，使(shi)用(yong)過程中，發射(she)信(xin)號(hao)與(yu)(yu)接收信(xin)號(hao)完(wan)全不(bu)受任何千擾(rao)(rao)，可(ke)(ke)保(bao)(bao)持很好的(de)(de)(de)穩(wen)定性，具(ju)有(you)良好的(de)(de)(de)抗(kang)(kang)(kang)千擾(rao)(rao)性和抗(kang)(kang)(kang)低頻干(gan)擾(rao)(rao)能(neng)(neng)(neng)(neng)力(li)，即(ji)使(shi)在惡劣的(de)(de)(de)環(huan)境(jing)下(xia)也能(neng)(neng)(neng)(neng)保(bao)(bao)持較(jiao)好的(de)(de)(de)性能(neng)(neng)(neng)(neng)。因此無(wu)線(xian)系(xi)統(tong)(tong)(tong)有(you)較(jiao)高(gao)的(de)(de)(de)可(ke)(ke)靠性。

2.功耗小、不(bu)受(shou)天(tian)氣、濕(shi)度的影響(xiang)

無線(xian)對(dui)講系統在不(bu)同的(de)(de)環(huan)(huan)境(jing)中，無線(xian)通信(xin)(xin)設(she)(she)備(bei)和有(you)線(xian)通信(xin)(xin)設(she)(she)備(bei)一樣都要進行電(dian)能的(de)(de)消耗(hao)。當環(huan)(huan)境(jing)溫度在-40°C以下時(shi)(shi)，無線(xian)通信(xin)(xin)設(she)(she)備(bei)需要每天工(gong)作8小時(shi)(shi)左右;當環(huan)(huan)境(jing)溫度為-20°C時(shi)(shi)，每天工(gong)作8小時(shi)(shi)左右;當環(huan)(huan)境(jing)溫度為-30°C時(shi)(shi)，每天工(gong)作4小時(shi)(shi)左右。目前(qian)市(shi)場上常(chang)見的(de)(de)無線(xian)對(dui)講系統有(you)兩種(zhong)電(dian)源輸(shu)入(ru)方式，一種(zhong)是電(dian)源輸(shu)入(ru)，另一種(zhong)是電(dian)源輸(shu)出。從這兩種(zhong)方式對(dui)系統的(de)(de)功耗(hao)來看(kan)，電(dian)源輸(shu)入(ru)方式的(de)(de)功耗(hao)更大一些，但是功耗(hao)很小。并且設(she)(she)備(bei)的(de)(de)工(gong)作環(huan)(huan)境(jing)不(bu)同，對(dui)電(dian)池(chi)的(de)(de)需求量也不(bu)同，所(suo)以功耗(hao)也不(bu)同。

3信號不受干擾

在(zai)(zai)(zai)(zai)一些(xie)有干擾(rao)的(de)(de)(de)地方(fang)，例如(ru)(ru)野外(wai)、機場、工(gong)廠等(deng)，一般采(cai)(cai)用(yong)(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)方(fang)式。分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)方(fang)式的(de)(de)(de)抗(kang)干擾(rao)能力(li)不(bu)強(qiang)，其(qi)(qi)(qi)抗(kang)干擾(rao)能力(li)主(zhu)(zhu)要取決(jue)于射(she)頻(pin)(pin)(pin)(pin)(pin)功率(lv)的(de)(de)(de)大小(xiao)。分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技術(shu)的(de)(de)(de)功率(lv)一般是(shi)50dB在(zai)(zai)(zai)(zai)50dB左右時，其(qi)(qi)(qi)抗(kang)干擾(rao)能力(li)強(qiang)。但(dan)由于分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)的(de)(de)(de)干擾(rao)與(yu)噪(zao)聲(sheng)(主(zhu)(zhu)要是(shi)周邊噪(zao)聲(sheng))具有很強(qiang)的(de)(de)(de)互通性，當分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)發射(she)的(de)(de)(de)信(xin)(xin)號超過50dB時，其(qi)(qi)(qi)抗(kang)千擾(rao)能力(li)就(jiu)會(hui)(hui)減弱(ruo)。另外(wai)，在(zai)(zai)(zai)(zai)一些(xie)有噪(zao)音(yin)的(de)(de)(de)環境中使(shi)用(yong)(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技術(shu)，會(hui)(hui)使(shi)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)信(xin)(xin)號無(wu)法到達發射(she)端的(de)(de)(de)接收(shou)(shou)機或(huo)者造(zao)成發射(she)端信(xin)(xin)號與(yu)接收(shou)(shou)端信(xin)(xin)號的(de)(de)(de)糟(zao)合而(er)造(zao)成分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)或(huo)干擾(rao)(例如(ru)(ru)在(zai)(zai)(zai)(zai)使(shi)用(yong)(yong)(yong)室(shi)外(wai)電話時) 。而(er)采(cai)(cai)用(yong)(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技術(shu)的(de)(de)(de)無(wu)線(xian)對(dui)(dui)講系統(tong)由于發射(she)功率(lv)小(xiao)，分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)后的(de)(de)(de)信(xin)(xin)號強(qiang)度(du)(du)比有線(xian)對(dui)(dui)講系統(tong)高很多(在(zai)(zai)(zai)(zai)實際使(shi)用(yong)(yong)(yong)中分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)設備一般可以(yi)將(jiang)系統(tong)信(xin)(xin)號分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)到50dB以(yi)上(shang)),信(xin)(xin)號不(bu)受干擾(rao)。如(ru)(ru)果采(cai)(cai)用(yong)(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技術(shu)，需(xu)要在(zai)(zai)(zai)(zai)較大的(de)(de)(de)回波功率(lv)下才能實現信(xin)(xin)號的(de)(de)(de)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)工(gong)作(zuo)(如(ru)(ru)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)器(qi)發射(she)信(xin)(xin)號與(yu)接收(shou)(shou)信(xin)(xin)號重疊時產生(sheng)的(de)(de)(de)千擾(rao))和發送信(xin)(xin)號強(qiang)度(du)(du)降(jiang)低(di)(同(tong)頻(pin)(pin)(pin)(pin)(pin)帶內的(de)(de)(de)兩只天(tian)線(xian)對(dui)(dui)同(tong)一信(xin)(xin)道(dao)傳輸的(de)(de)(de)信(xin)(xin)號強(qiang)度(du)(du)基本(ben)一致);如(ru)(ru)果采(cai)(cai)用(yong)(yong)(yong)混響(xiang)技術(shu)，則可以(yi)實現對(dui)(dui)無(wu)線(xian)信(xin)(xin)號干擾(rao)的(de)(de)(de)抑制或(huo)降(jiang)低(di)。