由于在戶(hu)外(wai)、室內(nei)等區域，無(wu)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)統的(de)信(xin)號強度較弱(ruo)，而且采(cai)用(yong)頻率(lv)調制(zhi)(zhi)技術（如 MHZ、 NMR、 BSI等）產(chan)生的(de)信(xin)號傳(chuan)輸(shu)時(shi)延大，傳(chuan)輸(shu)距離遠。因(yin)此有(you)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)統不適合在戶(hu)外(wai)環境使(shi)(shi)用(yong)，特別(bie)是在冬天及低風速季(ji)節使(shi)(shi)用(yong)。雖然無(wu)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)統也(ye)有(you)著不錯的(de)效果。但由于系(xi)(xi)統工作時(shi)會(hui)有(you)一定的(de)干擾，使(shi)(shi)對(dui)(dui)講(jiang)效果下(xia)降，另外(wai)在信(xin)號較弱(ruo)時(shi)對(dui)(dui)用(yong)戶(hu)語音(yin)產(chan)生了(le)(le)影響。特別(bie)是在人員復雜、通信(xin)距離較短(duan)或需要(yao)較長時(shi)間使(shi)(shi)用(yong)時(shi)。因(yin)此，更需要(yao)有(you)一個可靠的(de)無(wu)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)統提供(gong)與有(you)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)統一樣的(de)語音(yin)信(xin)息與控制(zhi)(zhi)。無(wu)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)統具(ju)有(you)很(hen)高的(de)靈活性，它(ta)能夠滿(man)足現場中所有(you)環境使(shi)(shi)用(yong)需求并能隨時(shi)切換（如在野外(wai)、戶(hu)外(wai)電(dian)話等),用(yong)戶(hu)可以在任何地點使(shi)(shi)用(yong)、隨時(shi)、隨地進行通訊。使(shi)(shi)用(yong)方(fang)便、節省成本、節約費用(yong)。下(xia)面(mian)我們來了(le)(le)解一下(xia)無(wu)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)統它(ta)主要(yao)是什么優點？

1.性(xing)能穩定，可靠(kao)性(xing)高(gao)

在相同無(wu)線(xian)(xian)(xian)(xian)傳輸距離下(xia)(xia)，無(wu)線(xian)(xian)(xian)(xian)傳輸信(xin)(xin)(xin)號(hao)更穩(wen)定(ding)由于(yu)使用(yong)(yong)了(le)功率(lv)放(fang)大器來(lai)對(dui)(dui)無(wu)線(xian)(xian)(xian)(xian)信(xin)(xin)(xin)號(hao)進(jin)行(xing)壓(ya)縮和放(fang)大，使無(wu)線(xian)(xian)(xian)(xian)信(xin)(xin)(xin)號(hao)更加(jia)穩(wen)定(ding)可靠(kao)。無(wu)線(xian)(xian)(xian)(xian)信(xin)(xin)(xin)號(hao)在弱電磁環(huan)境下(xia)(xia)也(ye)能(neng)保(bao)持(chi)較好(hao)(hao)的(de)(de)性(xing)(xing)能(neng)。無(wu)線(xian)(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)具有(you)(you)發(fa)(fa)射(she)(she)(she)功率(lv)小、抗(kang)千(qian)(qian)擾(rao)(rao)能(neng)力強(與有(you)(you)線(xian)(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)比(bi)較)和抗(kang)電磁干擾(rao)(rao)能(neng)力強(與有(you)(you)線(xian)(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)比(bi)較)的(de)(de)特點。無(wu)線(xian)(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)發(fa)(fa)射(she)(she)(she)信(xin)(xin)(xin)號(hao)在發(fa)(fa)射(she)(she)(she)前(qian)和發(fa)(fa)射(she)(she)(she)后均能(neng)保(bao)持(chi)良(liang)(liang)好(hao)(hao)的(de)(de)性(xing)(xing)能(neng)，使用(yong)(yong)過程中，發(fa)(fa)射(she)(she)(she)信(xin)(xin)(xin)號(hao)與接收信(xin)(xin)(xin)號(hao)完全不受任何千(qian)(qian)擾(rao)(rao)，可保(bao)持(chi)很好(hao)(hao)的(de)(de)穩(wen)定(ding)性(xing)(xing)，具有(you)(you)良(liang)(liang)好(hao)(hao)的(de)(de)抗(kang)千(qian)(qian)擾(rao)(rao)性(xing)(xing)和抗(kang)低頻干擾(rao)(rao)能(neng)力，即(ji)使在惡劣的(de)(de)環(huan)境下(xia)(xia)也(ye)能(neng)保(bao)持(chi)較好(hao)(hao)的(de)(de)性(xing)(xing)能(neng)。因此無(wu)線(xian)(xian)(xian)(xian)系(xi)(xi)(xi)統(tong)(tong)(tong)有(you)(you)較高的(de)(de)可靠(kao)性(xing)(xing)。

2.功耗小、不受天(tian)氣、濕度的(de)影響

無(wu)線(xian)(xian)對講(jiang)系(xi)統(tong)在不(bu)同的(de)(de)環(huan)境(jing)中，無(wu)線(xian)(xian)通(tong)(tong)信(xin)(xin)設(she)備(bei)和有(you)線(xian)(xian)通(tong)(tong)信(xin)(xin)設(she)備(bei)一(yi)(yi)樣(yang)都要進(jin)行電能的(de)(de)消耗(hao)。當(dang)環(huan)境(jing)溫度在-40°C以下時(shi)(shi)，無(wu)線(xian)(xian)通(tong)(tong)信(xin)(xin)設(she)備(bei)需要每(mei)天工(gong)作(zuo)8小(xiao)(xiao)(xiao)時(shi)(shi)左右;當(dang)環(huan)境(jing)溫度為-20°C時(shi)(shi)，每(mei)天工(gong)作(zuo)8小(xiao)(xiao)(xiao)時(shi)(shi)左右;當(dang)環(huan)境(jing)溫度為-30°C時(shi)(shi)，每(mei)天工(gong)作(zuo)4小(xiao)(xiao)(xiao)時(shi)(shi)左右。目前(qian)市場上常見的(de)(de)無(wu)線(xian)(xian)對講(jiang)系(xi)統(tong)有(you)兩種(zhong)電源輸入(ru)方式(shi)(shi)，一(yi)(yi)種(zhong)是(shi)電源輸入(ru)，另(ling)一(yi)(yi)種(zhong)是(shi)電源輸出。從這兩種(zhong)方式(shi)(shi)對系(xi)統(tong)的(de)(de)功(gong)(gong)耗(hao)來看，電源輸入(ru)方式(shi)(shi)的(de)(de)功(gong)(gong)耗(hao)更大一(yi)(yi)些，但是(shi)功(gong)(gong)耗(hao)很小(xiao)(xiao)(xiao)。并且(qie)設(she)備(bei)的(de)(de)工(gong)作(zuo)環(huan)境(jing)不(bu)同，對電池的(de)(de)需求(qiu)量也(ye)(ye)不(bu)同，所以功(gong)(gong)耗(hao)也(ye)(ye)不(bu)同。

3信號不受干擾

在一(yi)些有(you)干(gan)擾(rao)(rao)的(de)(de)(de)(de)地方(fang)，例(li)如(ru)野外(wai)、機場、工(gong)廠等，一(yi)般采(cai)(cai)(cai)用(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)方(fang)式。分(fen)(fen)(fen)(fen)頻(pin)(pin)方(fang)式的(de)(de)(de)(de)抗干(gan)擾(rao)(rao)能(neng)(neng)力不強(qiang)(qiang)，其(qi)抗干(gan)擾(rao)(rao)能(neng)(neng)力主要(yao)取決(jue)于射(she)頻(pin)(pin)功率的(de)(de)(de)(de)大小(xiao)。分(fen)(fen)(fen)(fen)頻(pin)(pin)技(ji)術的(de)(de)(de)(de)功率一(yi)般是(shi)50dB在50dB左右時，其(qi)抗干(gan)擾(rao)(rao)能(neng)(neng)力強(qiang)(qiang)。但由于分(fen)(fen)(fen)(fen)頻(pin)(pin)的(de)(de)(de)(de)干(gan)擾(rao)(rao)與(yu)噪(zao)聲(sheng)(sheng)(主要(yao)是(shi)周邊噪(zao)聲(sheng)(sheng))具有(you)很(hen)強(qiang)(qiang)的(de)(de)(de)(de)互通性，當分(fen)(fen)(fen)(fen)頻(pin)(pin)發(fa)(fa)射(she)的(de)(de)(de)(de)信(xin)號(hao)(hao)超過50dB時，其(qi)抗千擾(rao)(rao)能(neng)(neng)力就會減弱(ruo)。另外(wai)，在一(yi)些有(you)噪(zao)音的(de)(de)(de)(de)環境(jing)中使(shi)(shi)用(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)技(ji)術，會使(shi)(shi)分(fen)(fen)(fen)(fen)頻(pin)(pin)信(xin)號(hao)(hao)無法(fa)到達發(fa)(fa)射(she)端(duan)(duan)的(de)(de)(de)(de)接(jie)收(shou)機或(huo)者造成(cheng)發(fa)(fa)射(she)端(duan)(duan)信(xin)號(hao)(hao)與(yu)接(jie)收(shou)端(duan)(duan)信(xin)號(hao)(hao)的(de)(de)(de)(de)糟合(he)而造成(cheng)分(fen)(fen)(fen)(fen)頻(pin)(pin)或(huo)干(gan)擾(rao)(rao)(例(li)如(ru)在使(shi)(shi)用(yong)(yong)室(shi)外(wai)電話時) 。而采(cai)(cai)(cai)用(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)技(ji)術的(de)(de)(de)(de)無線(xian)(xian)對(dui)講系統由于發(fa)(fa)射(she)功率小(xiao)，分(fen)(fen)(fen)(fen)頻(pin)(pin)后的(de)(de)(de)(de)信(xin)號(hao)(hao)強(qiang)(qiang)度比有(you)線(xian)(xian)對(dui)講系統高很(hen)多(在實際(ji)使(shi)(shi)用(yong)(yong)中分(fen)(fen)(fen)(fen)頻(pin)(pin)設(she)備一(yi)般可以(yi)將(jiang)系統信(xin)號(hao)(hao)分(fen)(fen)(fen)(fen)頻(pin)(pin)到50dB以(yi)上),信(xin)號(hao)(hao)不受干(gan)擾(rao)(rao)。如(ru)果采(cai)(cai)(cai)用(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)技(ji)術，需要(yao)在較(jiao)大的(de)(de)(de)(de)回(hui)波功率下才能(neng)(neng)實現信(xin)號(hao)(hao)的(de)(de)(de)(de)分(fen)(fen)(fen)(fen)頻(pin)(pin)工(gong)作(如(ru)分(fen)(fen)(fen)(fen)頻(pin)(pin)器(qi)發(fa)(fa)射(she)信(xin)號(hao)(hao)與(yu)接(jie)收(shou)信(xin)號(hao)(hao)重疊(die)時產生的(de)(de)(de)(de)千擾(rao)(rao))和發(fa)(fa)送信(xin)號(hao)(hao)強(qiang)(qiang)度降低(同頻(pin)(pin)帶內的(de)(de)(de)(de)兩只天(tian)線(xian)(xian)對(dui)同一(yi)信(xin)道(dao)傳輸的(de)(de)(de)(de)信(xin)號(hao)(hao)強(qiang)(qiang)度基(ji)本一(yi)致);如(ru)果采(cai)(cai)(cai)用(yong)(yong)混響技(ji)術，則可以(yi)實現對(dui)無線(xian)(xian)信(xin)號(hao)(hao)干(gan)擾(rao)(rao)的(de)(de)(de)(de)抑制或(huo)降低。