由(you)于(yu)在(zai)(zai)戶(hu)(hu)(hu)外、室內(nei)等區(qu)域，無(wu)(wu)線(xian)(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)統(tong)的(de)信(xin)(xin)號(hao)(hao)強度較(jiao)弱，而且采用(yong)(yong)頻率調(diao)制技(ji)術（如 MHZ、 NMR、 BSI等）產生(sheng)的(de)信(xin)(xin)號(hao)(hao)傳(chuan)輸(shu)時(shi)延大，傳(chuan)輸(shu)距(ju)離遠。因此(ci)有(you)(you)線(xian)(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)統(tong)不(bu)適合在(zai)(zai)戶(hu)(hu)(hu)外環境(jing)使(shi)(shi)用(yong)(yong)，特別是(shi)在(zai)(zai)冬天及低風速季節使(shi)(shi)用(yong)(yong)。雖然無(wu)(wu)線(xian)(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)統(tong)也有(you)(you)著不(bu)錯(cuo)的(de)效(xiao)果。但(dan)由(you)于(yu)系(xi)(xi)統(tong)工作(zuo)時(shi)會有(you)(you)一(yi)(yi)定的(de)干擾，使(shi)(shi)對(dui)(dui)講(jiang)效(xiao)果下降，另外在(zai)(zai)信(xin)(xin)號(hao)(hao)較(jiao)弱時(shi)對(dui)(dui)用(yong)(yong)戶(hu)(hu)(hu)語音產生(sheng)了(le)(le)影響。特別是(shi)在(zai)(zai)人員(yuan)復(fu)雜、通信(xin)(xin)距(ju)離較(jiao)短或需(xu)要較(jiao)長時(shi)間使(shi)(shi)用(yong)(yong)時(shi)。因此(ci)，更(geng)需(xu)要有(you)(you)一(yi)(yi)個可靠的(de)無(wu)(wu)線(xian)(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)統(tong)提供與有(you)(you)線(xian)(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)統(tong)一(yi)(yi)樣(yang)的(de)語音信(xin)(xin)息與控制。無(wu)(wu)線(xian)(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)統(tong)具有(you)(you)很高的(de)靈活性，它能夠滿足(zu)現(xian)場(chang)中所有(you)(you)環境(jing)使(shi)(shi)用(yong)(yong)需(xu)求并能隨(sui)時(shi)切換（如在(zai)(zai)野外、戶(hu)(hu)(hu)外電話等),用(yong)(yong)戶(hu)(hu)(hu)可以在(zai)(zai)任何地點(dian)使(shi)(shi)用(yong)(yong)、隨(sui)時(shi)、隨(sui)地進行通訊。使(shi)(shi)用(yong)(yong)方便、節省成本、節約費用(yong)(yong)。下面我們來了(le)(le)解一(yi)(yi)下無(wu)(wu)線(xian)(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)統(tong)它主要是(shi)什(shen)么優點(dian)？

1.性能穩(wen)定(ding)，可靠性高

在(zai)相同(tong)無(wu)(wu)(wu)線(xian)(xian)傳(chuan)輸距離下，無(wu)(wu)(wu)線(xian)(xian)傳(chuan)輸信號更穩(wen)定(ding)由(you)于使(shi)用(yong)了(le)功(gong)(gong)率放大器(qi)來對(dui)無(wu)(wu)(wu)線(xian)(xian)信號進(jin)行(xing)壓縮和(he)(he)放大，使(shi)無(wu)(wu)(wu)線(xian)(xian)信號更加(jia)穩(wen)定(ding)可靠。無(wu)(wu)(wu)線(xian)(xian)信號在(zai)弱(ruo)電(dian)磁(ci)環境下也能(neng)保持(chi)較好的性(xing)能(neng)。無(wu)(wu)(wu)線(xian)(xian)對(dui)講(jiang)系(xi)(xi)統(tong)具(ju)有(you)發(fa)(fa)(fa)射(she)(she)功(gong)(gong)率小、抗千擾能(neng)力強(與有(you)線(xian)(xian)對(dui)講(jiang)系(xi)(xi)統(tong)比較)和(he)(he)抗電(dian)磁(ci)干擾能(neng)力強(與有(you)線(xian)(xian)對(dui)講(jiang)系(xi)(xi)統(tong)比較)的特(te)點。無(wu)(wu)(wu)線(xian)(xian)對(dui)講(jiang)系(xi)(xi)統(tong)發(fa)(fa)(fa)射(she)(she)信號在(zai)發(fa)(fa)(fa)射(she)(she)前(qian)和(he)(he)發(fa)(fa)(fa)射(she)(she)后均能(neng)保持(chi)良好的性(xing)能(neng)，使(shi)用(yong)過程中，發(fa)(fa)(fa)射(she)(she)信號與接(jie)收信號完全(quan)不受任何千擾，可保持(chi)很(hen)好的穩(wen)定(ding)性(xing)，具(ju)有(you)良好的抗千擾性(xing)和(he)(he)抗低(di)頻干擾能(neng)力，即使(shi)在(zai)惡劣的環境下也能(neng)保持(chi)較好的性(xing)能(neng)。因此無(wu)(wu)(wu)線(xian)(xian)系(xi)(xi)統(tong)有(you)較高的可靠性(xing)。

2.功耗小、不(bu)受天氣、濕度(du)的影響

無線(xian)(xian)對(dui)(dui)講系統在不(bu)(bu)同(tong)的(de)(de)環(huan)(huan)(huan)境(jing)(jing)(jing)(jing)中，無線(xian)(xian)通信(xin)設(she)備和(he)有線(xian)(xian)通信(xin)設(she)備一(yi)樣都要進行(xing)電(dian)(dian)能的(de)(de)消耗(hao)。當(dang)(dang)環(huan)(huan)(huan)境(jing)(jing)(jing)(jing)溫(wen)度在-40°C以下時(shi)(shi)，無線(xian)(xian)通信(xin)設(she)備需要每天工(gong)作8小(xiao)(xiao)時(shi)(shi)左右(you);當(dang)(dang)環(huan)(huan)(huan)境(jing)(jing)(jing)(jing)溫(wen)度為-20°C時(shi)(shi)，每天工(gong)作8小(xiao)(xiao)時(shi)(shi)左右(you);當(dang)(dang)環(huan)(huan)(huan)境(jing)(jing)(jing)(jing)溫(wen)度為-30°C時(shi)(shi)，每天工(gong)作4小(xiao)(xiao)時(shi)(shi)左右(you)。目前市場(chang)上(shang)常見的(de)(de)無線(xian)(xian)對(dui)(dui)講系統有兩種(zhong)電(dian)(dian)源輸(shu)(shu)入方(fang)式(shi)，一(yi)種(zhong)是電(dian)(dian)源輸(shu)(shu)入，另一(yi)種(zhong)是電(dian)(dian)源輸(shu)(shu)出(chu)。從這兩種(zhong)方(fang)式(shi)對(dui)(dui)系統的(de)(de)功(gong)(gong)耗(hao)來看(kan)，電(dian)(dian)源輸(shu)(shu)入方(fang)式(shi)的(de)(de)功(gong)(gong)耗(hao)更大一(yi)些(xie)，但是功(gong)(gong)耗(hao)很小(xiao)(xiao)。并且(qie)設(she)備的(de)(de)工(gong)作環(huan)(huan)(huan)境(jing)(jing)(jing)(jing)不(bu)(bu)同(tong)，對(dui)(dui)電(dian)(dian)池的(de)(de)需求量也(ye)不(bu)(bu)同(tong)，所(suo)以功(gong)(gong)耗(hao)也(ye)不(bu)(bu)同(tong)。

3信號不受干擾

在一(yi)些有干(gan)擾(rao)(rao)的(de)(de)(de)(de)(de)地方，例如野外(wai)、機場、工廠等(deng)，一(yi)般采(cai)(cai)用(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)方式(shi)(shi)。分(fen)(fen)頻(pin)(pin)(pin)(pin)方式(shi)(shi)的(de)(de)(de)(de)(de)抗(kang)(kang)干(gan)擾(rao)(rao)能(neng)(neng)力不強，其(qi)抗(kang)(kang)干(gan)擾(rao)(rao)能(neng)(neng)力主要(yao)取(qu)決于(yu)(yu)射(she)(she)頻(pin)(pin)(pin)(pin)功(gong)率的(de)(de)(de)(de)(de)大(da)小。分(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)(de)(de)功(gong)率一(yi)般是50dB在50dB左右(you)時，其(qi)抗(kang)(kang)干(gan)擾(rao)(rao)能(neng)(neng)力強。但(dan)由(you)于(yu)(yu)分(fen)(fen)頻(pin)(pin)(pin)(pin)的(de)(de)(de)(de)(de)干(gan)擾(rao)(rao)與噪聲(主要(yao)是周(zhou)邊噪聲)具有很(hen)強的(de)(de)(de)(de)(de)互通性(xing)，當(dang)分(fen)(fen)頻(pin)(pin)(pin)(pin)發(fa)射(she)(she)的(de)(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)超過50dB時，其(qi)抗(kang)(kang)千擾(rao)(rao)能(neng)(neng)力就會(hui)減弱。另外(wai)，在一(yi)些有噪音的(de)(de)(de)(de)(de)環(huan)境(jing)中(zhong)使(shi)用(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)術(shu)，會(hui)使(shi)分(fen)(fen)頻(pin)(pin)(pin)(pin)信(xin)(xin)號(hao)(hao)(hao)無法到達發(fa)射(she)(she)端的(de)(de)(de)(de)(de)接(jie)收機或者造成(cheng)發(fa)射(she)(she)端信(xin)(xin)號(hao)(hao)(hao)與接(jie)收端信(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)(de)糟合而造成(cheng)分(fen)(fen)頻(pin)(pin)(pin)(pin)或干(gan)擾(rao)(rao)(例如在使(shi)用(yong)(yong)室外(wai)電話時) 。而采(cai)(cai)用(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)(de)(de)無線(xian)(xian)對(dui)(dui)講系(xi)統由(you)于(yu)(yu)發(fa)射(she)(she)功(gong)率小，分(fen)(fen)頻(pin)(pin)(pin)(pin)后的(de)(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)強度(du)比有線(xian)(xian)對(dui)(dui)講系(xi)統高很(hen)多(在實際(ji)使(shi)用(yong)(yong)中(zhong)分(fen)(fen)頻(pin)(pin)(pin)(pin)設備(bei)一(yi)般可以(yi)將(jiang)系(xi)統信(xin)(xin)號(hao)(hao)(hao)分(fen)(fen)頻(pin)(pin)(pin)(pin)到50dB以(yi)上(shang)),信(xin)(xin)號(hao)(hao)(hao)不受干(gan)擾(rao)(rao)。如果(guo)采(cai)(cai)用(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)術(shu)，需(xu)要(yao)在較大(da)的(de)(de)(de)(de)(de)回波功(gong)率下才能(neng)(neng)實現信(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)(de)分(fen)(fen)頻(pin)(pin)(pin)(pin)工作(如分(fen)(fen)頻(pin)(pin)(pin)(pin)器發(fa)射(she)(she)信(xin)(xin)號(hao)(hao)(hao)與接(jie)收信(xin)(xin)號(hao)(hao)(hao)重疊(die)時產生的(de)(de)(de)(de)(de)千擾(rao)(rao))和(he)發(fa)送信(xin)(xin)號(hao)(hao)(hao)強度(du)降低(同(tong)(tong)頻(pin)(pin)(pin)(pin)帶內的(de)(de)(de)(de)(de)兩只(zhi)天線(xian)(xian)對(dui)(dui)同(tong)(tong)一(yi)信(xin)(xin)道(dao)傳輸的(de)(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)(hao)強度(du)基本一(yi)致);如果(guo)采(cai)(cai)用(yong)(yong)混響技(ji)術(shu)，則可以(yi)實現對(dui)(dui)無線(xian)(xian)信(xin)(xin)號(hao)(hao)(hao)干(gan)擾(rao)(rao)的(de)(de)(de)(de)(de)抑制或降低。