由于(yu)在(zai)戶(hu)外(wai)(wai)、室內等區域(yu)，無線對(dui)(dui)講(jiang)(jiang)(jiang)系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)的(de)(de)信(xin)號強(qiang)度較(jiao)弱，而且采(cai)用(yong)(yong)(yong)頻(pin)率調制技術（如 MHZ、 NMR、 BSI等）產(chan)生的(de)(de)信(xin)號傳(chuan)輸時(shi)(shi)延大，傳(chuan)輸距(ju)離(li)遠。因(yin)此(ci)有線對(dui)(dui)講(jiang)(jiang)(jiang)系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)不(bu)(bu)適合(he)在(zai)戶(hu)外(wai)(wai)環(huan)境使(shi)用(yong)(yong)(yong)，特(te)別(bie)是(shi)在(zai)冬天(tian)及(ji)低風速季(ji)節使(shi)用(yong)(yong)(yong)。雖然無線對(dui)(dui)講(jiang)(jiang)(jiang)系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)也(ye)有著不(bu)(bu)錯的(de)(de)效果(guo)。但由于(yu)系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)工(gong)作時(shi)(shi)會有一定的(de)(de)干擾，使(shi)對(dui)(dui)講(jiang)(jiang)(jiang)效果(guo)下降(jiang)，另外(wai)(wai)在(zai)信(xin)號較(jiao)弱時(shi)(shi)對(dui)(dui)用(yong)(yong)(yong)戶(hu)語音(yin)產(chan)生了(le)影響。特(te)別(bie)是(shi)在(zai)人員(yuan)復雜、通信(xin)距(ju)離(li)較(jiao)短或(huo)需(xu)要(yao)較(jiao)長時(shi)(shi)間使(shi)用(yong)(yong)(yong)時(shi)(shi)。因(yin)此(ci)，更需(xu)要(yao)有一個可靠的(de)(de)無線對(dui)(dui)講(jiang)(jiang)(jiang)系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)提供與有線對(dui)(dui)講(jiang)(jiang)(jiang)系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)一樣的(de)(de)語音(yin)信(xin)息與控制。無線對(dui)(dui)講(jiang)(jiang)(jiang)系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)具有很高的(de)(de)靈(ling)活性，它能(neng)夠滿足現(xian)場(chang)中所有環(huan)境使(shi)用(yong)(yong)(yong)需(xu)求并能(neng)隨時(shi)(shi)切換(huan)（如在(zai)野外(wai)(wai)、戶(hu)外(wai)(wai)電話等),用(yong)(yong)(yong)戶(hu)可以(yi)在(zai)任(ren)何地點使(shi)用(yong)(yong)(yong)、隨時(shi)(shi)、隨地進行通訊。使(shi)用(yong)(yong)(yong)方便、節省成本、節約費用(yong)(yong)(yong)。下面(mian)我們(men)來了(le)解一下無線對(dui)(dui)講(jiang)(jiang)(jiang)系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)它主要(yao)是(shi)什么優(you)點？

1.性能(neng)穩定，可靠性高

在(zai)相同無線(xian)(xian)(xian)(xian)(xian)傳輸距離下，無線(xian)(xian)(xian)(xian)(xian)傳輸信(xin)號(hao)更穩(wen)定由(you)于(yu)使(shi)用了功率(lv)放大器來對無線(xian)(xian)(xian)(xian)(xian)信(xin)號(hao)進(jin)行壓縮和(he)(he)放大，使(shi)無線(xian)(xian)(xian)(xian)(xian)信(xin)號(hao)更加(jia)穩(wen)定可(ke)靠(kao)。無線(xian)(xian)(xian)(xian)(xian)信(xin)號(hao)在(zai)弱電磁環境下也能(neng)(neng)保持(chi)較(jiao)(jiao)好(hao)(hao)的性(xing)能(neng)(neng)。無線(xian)(xian)(xian)(xian)(xian)對講系(xi)統具(ju)有發(fa)射(she)(she)功率(lv)小、抗(kang)千(qian)擾(rao)能(neng)(neng)力(li)強(qiang)(與有線(xian)(xian)(xian)(xian)(xian)對講系(xi)統比較(jiao)(jiao))和(he)(he)抗(kang)電磁干擾(rao)能(neng)(neng)力(li)強(qiang)(與有線(xian)(xian)(xian)(xian)(xian)對講系(xi)統比較(jiao)(jiao))的特點(dian)。無線(xian)(xian)(xian)(xian)(xian)對講系(xi)統發(fa)射(she)(she)信(xin)號(hao)在(zai)發(fa)射(she)(she)前(qian)和(he)(he)發(fa)射(she)(she)后均能(neng)(neng)保持(chi)良(liang)好(hao)(hao)的性(xing)能(neng)(neng)，使(shi)用過程中，發(fa)射(she)(she)信(xin)號(hao)與接收信(xin)號(hao)完全不受(shou)任何(he)千(qian)擾(rao)，可(ke)保持(chi)很好(hao)(hao)的穩(wen)定性(xing)，具(ju)有良(liang)好(hao)(hao)的抗(kang)千(qian)擾(rao)性(xing)和(he)(he)抗(kang)低頻干擾(rao)能(neng)(neng)力(li)，即使(shi)在(zai)惡(e)劣的環境下也能(neng)(neng)保持(chi)較(jiao)(jiao)好(hao)(hao)的性(xing)能(neng)(neng)。因此無線(xian)(xian)(xian)(xian)(xian)系(xi)統有較(jiao)(jiao)高的可(ke)靠(kao)性(xing)。

2.功耗小、不受天氣(qi)、濕度的影響

無(wu)(wu)(wu)線(xian)對(dui)講系(xi)(xi)統(tong)在不(bu)(bu)同(tong)的(de)(de)(de)(de)環(huan)境中(zhong)，無(wu)(wu)(wu)線(xian)通信設備(bei)和有線(xian)通信設備(bei)一(yi)(yi)樣都要進行電(dian)能的(de)(de)(de)(de)消耗(hao)。當環(huan)境溫度在-40°C以下時(shi)(shi)，無(wu)(wu)(wu)線(xian)通信設備(bei)需要每天(tian)(tian)工作8小時(shi)(shi)左(zuo)右;當環(huan)境溫度為-20°C時(shi)(shi)，每天(tian)(tian)工作8小時(shi)(shi)左(zuo)右;當環(huan)境溫度為-30°C時(shi)(shi)，每天(tian)(tian)工作4小時(shi)(shi)左(zuo)右。目(mu)前市場上(shang)常見(jian)的(de)(de)(de)(de)無(wu)(wu)(wu)線(xian)對(dui)講系(xi)(xi)統(tong)有兩(liang)種電(dian)源輸入(ru)方(fang)式(shi)，一(yi)(yi)種是電(dian)源輸入(ru)，另一(yi)(yi)種是電(dian)源輸出。從(cong)這(zhe)兩(liang)種方(fang)式(shi)對(dui)系(xi)(xi)統(tong)的(de)(de)(de)(de)功耗(hao)來看，電(dian)源輸入(ru)方(fang)式(shi)的(de)(de)(de)(de)功耗(hao)更大一(yi)(yi)些，但是功耗(hao)很小。并且(qie)設備(bei)的(de)(de)(de)(de)工作環(huan)境不(bu)(bu)同(tong)，對(dui)電(dian)池(chi)的(de)(de)(de)(de)需求(qiu)量也不(bu)(bu)同(tong)，所以功耗(hao)也不(bu)(bu)同(tong)。

3信號不受干擾

在(zai)一(yi)(yi)些(xie)有干(gan)擾(rao)(rao)(rao)的(de)(de)(de)(de)地方，例(li)(li)如野外、機場、工廠等，一(yi)(yi)般采用(yong)(yong)分(fen)頻(pin)(pin)(pin)(pin)(pin)方式。分(fen)頻(pin)(pin)(pin)(pin)(pin)方式的(de)(de)(de)(de)抗(kang)干(gan)擾(rao)(rao)(rao)能力(li)(li)不(bu)強(qiang)，其抗(kang)干(gan)擾(rao)(rao)(rao)能力(li)(li)主(zhu)要(yao)(yao)取決于(yu)射頻(pin)(pin)(pin)(pin)(pin)功(gong)率的(de)(de)(de)(de)大小。分(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)(de)功(gong)率一(yi)(yi)般是(shi)(shi)50dB在(zai)50dB左右時(shi)，其抗(kang)干(gan)擾(rao)(rao)(rao)能力(li)(li)強(qiang)。但由(you)于(yu)分(fen)頻(pin)(pin)(pin)(pin)(pin)的(de)(de)(de)(de)干(gan)擾(rao)(rao)(rao)與噪(zao)聲(主(zhu)要(yao)(yao)是(shi)(shi)周(zhou)邊噪(zao)聲)具有很(hen)強(qiang)的(de)(de)(de)(de)互通性，當(dang)分(fen)頻(pin)(pin)(pin)(pin)(pin)發射的(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)超(chao)過50dB時(shi)，其抗(kang)千擾(rao)(rao)(rao)能力(li)(li)就會(hui)減弱。另外，在(zai)一(yi)(yi)些(xie)有噪(zao)音的(de)(de)(de)(de)環境(jing)中使用(yong)(yong)分(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)，會(hui)使分(fen)頻(pin)(pin)(pin)(pin)(pin)信(xin)(xin)(xin)號(hao)無法到達發射端的(de)(de)(de)(de)接收(shou)(shou)機或者造成發射端信(xin)(xin)(xin)號(hao)與接收(shou)(shou)端信(xin)(xin)(xin)號(hao)的(de)(de)(de)(de)糟合而造成分(fen)頻(pin)(pin)(pin)(pin)(pin)或干(gan)擾(rao)(rao)(rao)(例(li)(li)如在(zai)使用(yong)(yong)室外電(dian)話時(shi)) 。而采用(yong)(yong)分(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)(de)無線(xian)對講系統由(you)于(yu)發射功(gong)率小，分(fen)頻(pin)(pin)(pin)(pin)(pin)后的(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)強(qiang)度(du)(du)比(bi)有線(xian)對講系統高很(hen)多(在(zai)實(shi)際使用(yong)(yong)中分(fen)頻(pin)(pin)(pin)(pin)(pin)設備(bei)一(yi)(yi)般可以將系統信(xin)(xin)(xin)號(hao)分(fen)頻(pin)(pin)(pin)(pin)(pin)到50dB以上),信(xin)(xin)(xin)號(hao)不(bu)受干(gan)擾(rao)(rao)(rao)。如果(guo)采用(yong)(yong)分(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)，需要(yao)(yao)在(zai)較大的(de)(de)(de)(de)回波(bo)功(gong)率下才(cai)能實(shi)現信(xin)(xin)(xin)號(hao)的(de)(de)(de)(de)分(fen)頻(pin)(pin)(pin)(pin)(pin)工作(如分(fen)頻(pin)(pin)(pin)(pin)(pin)器(qi)發射信(xin)(xin)(xin)號(hao)與接收(shou)(shou)信(xin)(xin)(xin)號(hao)重(zhong)疊(die)時(shi)產(chan)生的(de)(de)(de)(de)千擾(rao)(rao)(rao))和(he)發送信(xin)(xin)(xin)號(hao)強(qiang)度(du)(du)降低(同頻(pin)(pin)(pin)(pin)(pin)帶內的(de)(de)(de)(de)兩只天(tian)線(xian)對同一(yi)(yi)信(xin)(xin)(xin)道傳輸的(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)強(qiang)度(du)(du)基本一(yi)(yi)致);如果(guo)采用(yong)(yong)混(hun)響(xiang)技(ji)術(shu)，則可以實(shi)現對無線(xian)信(xin)(xin)(xin)號(hao)干(gan)擾(rao)(rao)(rao)的(de)(de)(de)(de)抑(yi)制或降低。