由(you)于(yu)在(zai)(zai)戶(hu)外(wai)(wai)、室內等(deng)(deng)區(qu)域，無(wu)(wu)(wu)線(xian)對(dui)(dui)講(jiang)系(xi)(xi)統的(de)信(xin)(xin)(xin)號強度較弱，而且采用(yong)(yong)(yong)頻率調(diao)制技術（如 MHZ、 NMR、 BSI等(deng)(deng)）產生的(de)信(xin)(xin)(xin)號傳輸(shu)時(shi)(shi)延大，傳輸(shu)距離遠。因(yin)此(ci)有(you)線(xian)對(dui)(dui)講(jiang)系(xi)(xi)統不適合(he)在(zai)(zai)戶(hu)外(wai)(wai)環境使(shi)用(yong)(yong)(yong)，特別是在(zai)(zai)冬天(tian)及(ji)低風速(su)季(ji)節(jie)(jie)使(shi)用(yong)(yong)(yong)。雖然無(wu)(wu)(wu)線(xian)對(dui)(dui)講(jiang)系(xi)(xi)統也有(you)著不錯(cuo)的(de)效果(guo)(guo)。但由(you)于(yu)系(xi)(xi)統工作(zuo)時(shi)(shi)會有(you)一(yi)定(ding)的(de)干擾(rao)，使(shi)對(dui)(dui)講(jiang)效果(guo)(guo)下降，另外(wai)(wai)在(zai)(zai)信(xin)(xin)(xin)號較弱時(shi)(shi)對(dui)(dui)用(yong)(yong)(yong)戶(hu)語音產生了(le)影響。特別是在(zai)(zai)人員(yuan)復雜、通信(xin)(xin)(xin)距離較短(duan)或需要較長(chang)時(shi)(shi)間使(shi)用(yong)(yong)(yong)時(shi)(shi)。因(yin)此(ci)，更(geng)需要有(you)一(yi)個可(ke)靠的(de)無(wu)(wu)(wu)線(xian)對(dui)(dui)講(jiang)系(xi)(xi)統提供與有(you)線(xian)對(dui)(dui)講(jiang)系(xi)(xi)統一(yi)樣的(de)語音信(xin)(xin)(xin)息與控制。無(wu)(wu)(wu)線(xian)對(dui)(dui)講(jiang)系(xi)(xi)統具有(you)很(hen)高的(de)靈(ling)活性，它能夠滿足(zu)現場中所有(you)環境使(shi)用(yong)(yong)(yong)需求并(bing)能隨時(shi)(shi)切換（如在(zai)(zai)野外(wai)(wai)、戶(hu)外(wai)(wai)電(dian)話等(deng)(deng)),用(yong)(yong)(yong)戶(hu)可(ke)以在(zai)(zai)任(ren)何地(di)點使(shi)用(yong)(yong)(yong)、隨時(shi)(shi)、隨地(di)進行通訊(xun)。使(shi)用(yong)(yong)(yong)方(fang)便、節(jie)(jie)省成本、節(jie)(jie)約費用(yong)(yong)(yong)。下面我們(men)來了(le)解(jie)一(yi)下無(wu)(wu)(wu)線(xian)對(dui)(dui)講(jiang)系(xi)(xi)統它主要是什么優點？

1.性(xing)能穩定，可(ke)靠性(xing)高

在相同(tong)無(wu)(wu)(wu)線(xian)(xian)(xian)傳(chuan)輸距離(li)下，無(wu)(wu)(wu)線(xian)(xian)(xian)傳(chuan)輸信(xin)(xin)號(hao)更(geng)穩(wen)定由(you)于使(shi)用(yong)了功率放(fang)大(da)器來對無(wu)(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)進行壓縮和放(fang)大(da)，使(shi)無(wu)(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)更(geng)加穩(wen)定可(ke)靠。無(wu)(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)在弱(ruo)電磁環境下也能(neng)(neng)保(bao)持較好(hao)的(de)性能(neng)(neng)。無(wu)(wu)(wu)線(xian)(xian)(xian)對講(jiang)系(xi)統(tong)(tong)具有(you)發(fa)射(she)(she)功率小、抗千(qian)擾(rao)能(neng)(neng)力(li)(li)強(與(yu)有(you)線(xian)(xian)(xian)對講(jiang)系(xi)統(tong)(tong)比較)和抗電磁干擾(rao)能(neng)(neng)力(li)(li)強(與(yu)有(you)線(xian)(xian)(xian)對講(jiang)系(xi)統(tong)(tong)比較)的(de)特(te)點(dian)。無(wu)(wu)(wu)線(xian)(xian)(xian)對講(jiang)系(xi)統(tong)(tong)發(fa)射(she)(she)信(xin)(xin)號(hao)在發(fa)射(she)(she)前和發(fa)射(she)(she)后均能(neng)(neng)保(bao)持良(liang)好(hao)的(de)性能(neng)(neng)，使(shi)用(yong)過程中，發(fa)射(she)(she)信(xin)(xin)號(hao)與(yu)接收信(xin)(xin)號(hao)完全不受任(ren)何千(qian)擾(rao)，可(ke)保(bao)持很好(hao)的(de)穩(wen)定性，具有(you)良(liang)好(hao)的(de)抗千(qian)擾(rao)性和抗低頻干擾(rao)能(neng)(neng)力(li)(li)，即使(shi)在惡劣的(de)環境下也能(neng)(neng)保(bao)持較好(hao)的(de)性能(neng)(neng)。因此無(wu)(wu)(wu)線(xian)(xian)(xian)系(xi)統(tong)(tong)有(you)較高的(de)可(ke)靠性。

2.功耗小、不受天氣(qi)、濕度的(de)影響

無線(xian)對講系統(tong)(tong)在不同(tong)的(de)環(huan)境(jing)中，無線(xian)通(tong)信設備(bei)和有線(xian)通(tong)信設備(bei)一(yi)樣都要進行電(dian)能的(de)消耗(hao)(hao)。當環(huan)境(jing)溫(wen)度在-40°C以下時，無線(xian)通(tong)信設備(bei)需(xu)要每(mei)天(tian)工作(zuo)8小(xiao)時左右;當環(huan)境(jing)溫(wen)度為(wei)-20°C時，每(mei)天(tian)工作(zuo)8小(xiao)時左右;當環(huan)境(jing)溫(wen)度為(wei)-30°C時，每(mei)天(tian)工作(zuo)4小(xiao)時左右。目前市(shi)場上(shang)常見的(de)無線(xian)對講系統(tong)(tong)有兩(liang)種(zhong)電(dian)源(yuan)輸入(ru)方(fang)(fang)式(shi)(shi)(shi)，一(yi)種(zhong)是電(dian)源(yuan)輸入(ru)，另一(yi)種(zhong)是電(dian)源(yuan)輸出。從這兩(liang)種(zhong)方(fang)(fang)式(shi)(shi)(shi)對系統(tong)(tong)的(de)功(gong)耗(hao)(hao)來看，電(dian)源(yuan)輸入(ru)方(fang)(fang)式(shi)(shi)(shi)的(de)功(gong)耗(hao)(hao)更大一(yi)些，但是功(gong)耗(hao)(hao)很小(xiao)。并且設備(bei)的(de)工作(zuo)環(huan)境(jing)不同(tong)，對電(dian)池的(de)需(xu)求量也不同(tong)，所以功(gong)耗(hao)(hao)也不同(tong)。

3信號不受干擾

在一(yi)些有干(gan)(gan)(gan)擾(rao)(rao)的(de)(de)(de)(de)(de)地方(fang)，例如(ru)野外、機場(chang)、工廠(chang)等，一(yi)般采(cai)用(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)方(fang)式(shi)。分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)方(fang)式(shi)的(de)(de)(de)(de)(de)抗(kang)(kang)干(gan)(gan)(gan)擾(rao)(rao)能(neng)(neng)(neng)力不強(qiang)，其(qi)抗(kang)(kang)干(gan)(gan)(gan)擾(rao)(rao)能(neng)(neng)(neng)力主(zhu)要取決于(yu)(yu)(yu)射(she)頻(pin)(pin)(pin)(pin)功(gong)(gong)率(lv)的(de)(de)(de)(de)(de)大(da)小(xiao)。分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)(ji)(ji)(ji)術(shu)的(de)(de)(de)(de)(de)功(gong)(gong)率(lv)一(yi)般是(shi)50dB在50dB左右時(shi)(shi)，其(qi)抗(kang)(kang)干(gan)(gan)(gan)擾(rao)(rao)能(neng)(neng)(neng)力強(qiang)。但由于(yu)(yu)(yu)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)的(de)(de)(de)(de)(de)干(gan)(gan)(gan)擾(rao)(rao)與噪(zao)(zao)聲(sheng)(sheng)(主(zhu)要是(shi)周(zhou)邊噪(zao)(zao)聲(sheng)(sheng))具有很強(qiang)的(de)(de)(de)(de)(de)互(hu)通(tong)性，當分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)發射(she)的(de)(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)超過50dB時(shi)(shi)，其(qi)抗(kang)(kang)千擾(rao)(rao)能(neng)(neng)(neng)力就(jiu)會(hui)減弱。另外，在一(yi)些有噪(zao)(zao)音的(de)(de)(de)(de)(de)環(huan)境中(zhong)使用(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)(ji)(ji)(ji)術(shu)，會(hui)使分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)信(xin)(xin)號(hao)(hao)(hao)無法到達發射(she)端的(de)(de)(de)(de)(de)接收機或(huo)(huo)者(zhe)造成發射(she)端信(xin)(xin)號(hao)(hao)(hao)與接收端信(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)(de)糟合而造成分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)或(huo)(huo)干(gan)(gan)(gan)擾(rao)(rao)(例如(ru)在使用(yong)(yong)室外電話時(shi)(shi)) 。而采(cai)用(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)(ji)(ji)(ji)術(shu)的(de)(de)(de)(de)(de)無線(xian)對講(jiang)系統(tong)由于(yu)(yu)(yu)發射(she)功(gong)(gong)率(lv)小(xiao)，分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)后的(de)(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)強(qiang)度比有線(xian)對講(jiang)系統(tong)高很多(在實際使用(yong)(yong)中(zhong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)設備一(yi)般可以(yi)將(jiang)系統(tong)信(xin)(xin)號(hao)(hao)(hao)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)到50dB以(yi)上),信(xin)(xin)號(hao)(hao)(hao)不受干(gan)(gan)(gan)擾(rao)(rao)。如(ru)果采(cai)用(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)(ji)(ji)(ji)術(shu)，需要在較大(da)的(de)(de)(de)(de)(de)回波功(gong)(gong)率(lv)下才能(neng)(neng)(neng)實現信(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)(de)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)工作(如(ru)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)器發射(she)信(xin)(xin)號(hao)(hao)(hao)與接收信(xin)(xin)號(hao)(hao)(hao)重疊(die)時(shi)(shi)產(chan)生的(de)(de)(de)(de)(de)千擾(rao)(rao))和發送信(xin)(xin)號(hao)(hao)(hao)強(qiang)度降低(同頻(pin)(pin)(pin)(pin)帶內的(de)(de)(de)(de)(de)兩只天線(xian)對同一(yi)信(xin)(xin)道傳輸的(de)(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)強(qiang)度基本一(yi)致);如(ru)果采(cai)用(yong)(yong)混響技(ji)(ji)(ji)(ji)術(shu)，則(ze)可以(yi)實現對無線(xian)信(xin)(xin)號(hao)(hao)(hao)干(gan)(gan)(gan)擾(rao)(rao)的(de)(de)(de)(de)(de)抑制或(huo)(huo)降低。