由于在(zai)戶(hu)外、室內等區域，無(wu)線(xian)對(dui)(dui)講系(xi)(xi)統(tong)的信(xin)(xin)號強(qiang)度較弱(ruo)(ruo)，而且采用頻率(lv)調制技術（如 MHZ、 NMR、 BSI等）產生的信(xin)(xin)號傳(chuan)輸時延大，傳(chuan)輸距(ju)(ju)離遠。因此有線(xian)對(dui)(dui)講系(xi)(xi)統(tong)不適合在(zai)戶(hu)外環境使(shi)(shi)(shi)用，特(te)別是(shi)(shi)在(zai)冬(dong)天及低(di)風速季節使(shi)(shi)(shi)用。雖然無(wu)線(xian)對(dui)(dui)講系(xi)(xi)統(tong)也有著不錯的效果(guo)。但由于系(xi)(xi)統(tong)工作(zuo)時會有一(yi)定(ding)的干擾，使(shi)(shi)(shi)對(dui)(dui)講效果(guo)下降，另外在(zai)信(xin)(xin)號較弱(ruo)(ruo)時對(dui)(dui)用戶(hu)語音(yin)產生了影(ying)響。特(te)別是(shi)(shi)在(zai)人員復雜、通信(xin)(xin)距(ju)(ju)離較短或需要(yao)較長時間(jian)使(shi)(shi)(shi)用時。因此，更需要(yao)有一(yi)個可靠的無(wu)線(xian)對(dui)(dui)講系(xi)(xi)統(tong)提供與有線(xian)對(dui)(dui)講系(xi)(xi)統(tong)一(yi)樣的語音(yin)信(xin)(xin)息與控制。無(wu)線(xian)對(dui)(dui)講系(xi)(xi)統(tong)具有很高的靈活性，它(ta)能夠滿(man)足現場中(zhong)所有環境使(shi)(shi)(shi)用需求并(bing)能隨(sui)時切(qie)換（如在(zai)野外、戶(hu)外電話等),用戶(hu)可以在(zai)任何地點使(shi)(shi)(shi)用、隨(sui)時、隨(sui)地進行通訊。使(shi)(shi)(shi)用方便、節省成本、節約(yue)費用。下面(mian)我(wo)們來了解一(yi)下無(wu)線(xian)對(dui)(dui)講系(xi)(xi)統(tong)它(ta)主要(yao)是(shi)(shi)什么(me)優點？

1.性能(neng)穩定，可靠性高

在(zai)相同無(wu)線(xian)(xian)(xian)傳輸距(ju)離(li)下，無(wu)線(xian)(xian)(xian)傳輸信(xin)(xin)號(hao)更穩(wen)定由于使(shi)(shi)(shi)用(yong)了功(gong)(gong)率(lv)放(fang)大(da)器來(lai)對(dui)無(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)進行壓縮(suo)和放(fang)大(da)，使(shi)(shi)(shi)無(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)更加穩(wen)定可(ke)靠。無(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)在(zai)弱(ruo)電(dian)磁(ci)(ci)環(huan)境下也能(neng)保(bao)持(chi)較(jiao)好的(de)性(xing)能(neng)。無(wu)線(xian)(xian)(xian)對(dui)講(jiang)系(xi)統(tong)具有(you)發(fa)(fa)射(she)(she)(she)功(gong)(gong)率(lv)小、抗(kang)(kang)千(qian)擾能(neng)力強(qiang)(與(yu)有(you)線(xian)(xian)(xian)對(dui)講(jiang)系(xi)統(tong)比較(jiao))和抗(kang)(kang)電(dian)磁(ci)(ci)干擾能(neng)力強(qiang)(與(yu)有(you)線(xian)(xian)(xian)對(dui)講(jiang)系(xi)統(tong)比較(jiao))的(de)特點。無(wu)線(xian)(xian)(xian)對(dui)講(jiang)系(xi)統(tong)發(fa)(fa)射(she)(she)(she)信(xin)(xin)號(hao)在(zai)發(fa)(fa)射(she)(she)(she)前和發(fa)(fa)射(she)(she)(she)后均能(neng)保(bao)持(chi)良好的(de)性(xing)能(neng)，使(shi)(shi)(shi)用(yong)過程中(zhong)，發(fa)(fa)射(she)(she)(she)信(xin)(xin)號(hao)與(yu)接收信(xin)(xin)號(hao)完全不受任何千(qian)擾，可(ke)保(bao)持(chi)很好的(de)穩(wen)定性(xing)，具有(you)良好的(de)抗(kang)(kang)千(qian)擾性(xing)和抗(kang)(kang)低頻干擾能(neng)力，即使(shi)(shi)(shi)在(zai)惡劣的(de)環(huan)境下也能(neng)保(bao)持(chi)較(jiao)好的(de)性(xing)能(neng)。因此無(wu)線(xian)(xian)(xian)系(xi)統(tong)有(you)較(jiao)高(gao)的(de)可(ke)靠性(xing)。

2.功耗小、不受天氣、濕度的影響

無(wu)(wu)(wu)線(xian)(xian)對講系統在不同(tong)(tong)的(de)環(huan)(huan)境(jing)中，無(wu)(wu)(wu)線(xian)(xian)通(tong)信(xin)(xin)設(she)(she)備(bei)(bei)和有線(xian)(xian)通(tong)信(xin)(xin)設(she)(she)備(bei)(bei)一(yi)樣(yang)都要(yao)進行電(dian)(dian)能的(de)消耗(hao)(hao)。當(dang)環(huan)(huan)境(jing)溫度在-40°C以下時(shi)，無(wu)(wu)(wu)線(xian)(xian)通(tong)信(xin)(xin)設(she)(she)備(bei)(bei)需要(yao)每天(tian)工(gong)作(zuo)8小時(shi)左(zuo)右(you);當(dang)環(huan)(huan)境(jing)溫度為-20°C時(shi)，每天(tian)工(gong)作(zuo)8小時(shi)左(zuo)右(you);當(dang)環(huan)(huan)境(jing)溫度為-30°C時(shi)，每天(tian)工(gong)作(zuo)4小時(shi)左(zuo)右(you)。目前市場上常見的(de)無(wu)(wu)(wu)線(xian)(xian)對講系統有兩種(zhong)電(dian)(dian)源(yuan)(yuan)輸(shu)(shu)入(ru)方(fang)式(shi)(shi)，一(yi)種(zhong)是(shi)電(dian)(dian)源(yuan)(yuan)輸(shu)(shu)入(ru)，另一(yi)種(zhong)是(shi)電(dian)(dian)源(yuan)(yuan)輸(shu)(shu)出。從這兩種(zhong)方(fang)式(shi)(shi)對系統的(de)功耗(hao)(hao)來看，電(dian)(dian)源(yuan)(yuan)輸(shu)(shu)入(ru)方(fang)式(shi)(shi)的(de)功耗(hao)(hao)更大一(yi)些，但是(shi)功耗(hao)(hao)很(hen)小。并且設(she)(she)備(bei)(bei)的(de)工(gong)作(zuo)環(huan)(huan)境(jing)不同(tong)(tong)，對電(dian)(dian)池的(de)需求量(liang)也不同(tong)(tong)，所以功耗(hao)(hao)也不同(tong)(tong)。

3信號不受干擾

在(zai)(zai)一(yi)(yi)些有(you)干(gan)(gan)擾(rao)(rao)的(de)(de)(de)(de)地方，例如野外、機場、工(gong)廠等，一(yi)(yi)般(ban)采(cai)用(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)方式。分(fen)(fen)(fen)(fen)頻(pin)(pin)方式的(de)(de)(de)(de)抗干(gan)(gan)擾(rao)(rao)能(neng)力不強，其(qi)抗干(gan)(gan)擾(rao)(rao)能(neng)力主(zhu)要取(qu)決于(yu)射頻(pin)(pin)功(gong)率(lv)的(de)(de)(de)(de)大小。分(fen)(fen)(fen)(fen)頻(pin)(pin)技(ji)術(shu)的(de)(de)(de)(de)功(gong)率(lv)一(yi)(yi)般(ban)是50dB在(zai)(zai)50dB左右時(shi)，其(qi)抗干(gan)(gan)擾(rao)(rao)能(neng)力強。但由(you)于(yu)分(fen)(fen)(fen)(fen)頻(pin)(pin)的(de)(de)(de)(de)干(gan)(gan)擾(rao)(rao)與(yu)噪聲(主(zhu)要是周邊噪聲)具有(you)很(hen)強的(de)(de)(de)(de)互通性，當分(fen)(fen)(fen)(fen)頻(pin)(pin)發(fa)射的(de)(de)(de)(de)信(xin)(xin)號(hao)超過(guo)50dB時(shi)，其(qi)抗千(qian)擾(rao)(rao)能(neng)力就會減弱。另外，在(zai)(zai)一(yi)(yi)些有(you)噪音的(de)(de)(de)(de)環(huan)境中(zhong)使(shi)用(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)技(ji)術(shu)，會使(shi)分(fen)(fen)(fen)(fen)頻(pin)(pin)信(xin)(xin)號(hao)無法到(dao)達發(fa)射端(duan)的(de)(de)(de)(de)接收(shou)(shou)機或者造成發(fa)射端(duan)信(xin)(xin)號(hao)與(yu)接收(shou)(shou)端(duan)信(xin)(xin)號(hao)的(de)(de)(de)(de)糟合而(er)造成分(fen)(fen)(fen)(fen)頻(pin)(pin)或干(gan)(gan)擾(rao)(rao)(例如在(zai)(zai)使(shi)用(yong)室(shi)外電話時(shi)) 。而(er)采(cai)用(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)技(ji)術(shu)的(de)(de)(de)(de)無線(xian)(xian)對(dui)講系統(tong)(tong)由(you)于(yu)發(fa)射功(gong)率(lv)小，分(fen)(fen)(fen)(fen)頻(pin)(pin)后的(de)(de)(de)(de)信(xin)(xin)號(hao)強度比有(you)線(xian)(xian)對(dui)講系統(tong)(tong)高很(hen)多(在(zai)(zai)實際使(shi)用(yong)中(zhong)分(fen)(fen)(fen)(fen)頻(pin)(pin)設備一(yi)(yi)般(ban)可以將(jiang)系統(tong)(tong)信(xin)(xin)號(hao)分(fen)(fen)(fen)(fen)頻(pin)(pin)到(dao)50dB以上(shang)),信(xin)(xin)號(hao)不受干(gan)(gan)擾(rao)(rao)。如果采(cai)用(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)技(ji)術(shu)，需要在(zai)(zai)較大的(de)(de)(de)(de)回波功(gong)率(lv)下才能(neng)實現(xian)信(xin)(xin)號(hao)的(de)(de)(de)(de)分(fen)(fen)(fen)(fen)頻(pin)(pin)工(gong)作(如分(fen)(fen)(fen)(fen)頻(pin)(pin)器(qi)發(fa)射信(xin)(xin)號(hao)與(yu)接收(shou)(shou)信(xin)(xin)號(hao)重疊時(shi)產生(sheng)的(de)(de)(de)(de)千(qian)擾(rao)(rao))和發(fa)送信(xin)(xin)號(hao)強度降低(同(tong)頻(pin)(pin)帶(dai)內(nei)的(de)(de)(de)(de)兩只天線(xian)(xian)對(dui)同(tong)一(yi)(yi)信(xin)(xin)道(dao)傳輸的(de)(de)(de)(de)信(xin)(xin)號(hao)強度基本一(yi)(yi)致);如果采(cai)用(yong)混響技(ji)術(shu)，則可以實現(xian)對(dui)無線(xian)(xian)信(xin)(xin)號(hao)干(gan)(gan)擾(rao)(rao)的(de)(de)(de)(de)抑(yi)制或降低。