由于(yu)在(zai)戶(hu)(hu)外(wai)(wai)、室內等(deng)區(qu)域，無線(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)的(de)(de)信(xin)號(hao)強(qiang)度較(jiao)弱，而(er)且采用(yong)(yong)頻率調制技術（如 MHZ、 NMR、 BSI等(deng)）產生的(de)(de)信(xin)號(hao)傳輸時(shi)延大(da)，傳輸距離遠。因(yin)此有(you)線(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)不(bu)適合(he)在(zai)戶(hu)(hu)外(wai)(wai)環境使(shi)(shi)用(yong)(yong)，特(te)別(bie)是(shi)(shi)在(zai)冬天(tian)及低風速季節使(shi)(shi)用(yong)(yong)。雖然無線(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)也有(you)著不(bu)錯的(de)(de)效果。但(dan)由于(yu)系(xi)統(tong)(tong)(tong)工作(zuo)時(shi)會有(you)一(yi)(yi)定(ding)的(de)(de)干擾，使(shi)(shi)對(dui)(dui)(dui)講(jiang)(jiang)效果下降，另外(wai)(wai)在(zai)信(xin)號(hao)較(jiao)弱時(shi)對(dui)(dui)(dui)用(yong)(yong)戶(hu)(hu)語(yu)音(yin)產生了影響(xiang)。特(te)別(bie)是(shi)(shi)在(zai)人員(yuan)復雜、通(tong)信(xin)距離較(jiao)短(duan)或需(xu)要(yao)較(jiao)長時(shi)間使(shi)(shi)用(yong)(yong)時(shi)。因(yin)此，更需(xu)要(yao)有(you)一(yi)(yi)個(ge)可靠的(de)(de)無線(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)提供(gong)與有(you)線(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)一(yi)(yi)樣的(de)(de)語(yu)音(yin)信(xin)息與控制。無線(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)具有(you)很高(gao)的(de)(de)靈活(huo)性，它(ta)能夠(gou)滿足(zu)現場中所有(you)環境使(shi)(shi)用(yong)(yong)需(xu)求并能隨(sui)時(shi)切換(huan)（如在(zai)野外(wai)(wai)、戶(hu)(hu)外(wai)(wai)電(dian)話等(deng)),用(yong)(yong)戶(hu)(hu)可以(yi)在(zai)任何地點(dian)使(shi)(shi)用(yong)(yong)、隨(sui)時(shi)、隨(sui)地進行通(tong)訊。使(shi)(shi)用(yong)(yong)方便、節省成本(ben)、節約費用(yong)(yong)。下面我們來了解一(yi)(yi)下無線(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)它(ta)主(zhu)要(yao)是(shi)(shi)什么(me)優(you)點(dian)？

1.性能穩定，可靠性高

在(zai)(zai)相同無(wu)線(xian)(xian)傳輸距離下，無(wu)線(xian)(xian)傳輸信(xin)(xin)號(hao)更穩定(ding)由于使用(yong)了功(gong)(gong)率放大器來(lai)對無(wu)線(xian)(xian)信(xin)(xin)號(hao)進行壓縮和(he)(he)放大，使無(wu)線(xian)(xian)信(xin)(xin)號(hao)更加(jia)穩定(ding)可(ke)靠(kao)。無(wu)線(xian)(xian)信(xin)(xin)號(hao)在(zai)(zai)弱電磁(ci)(ci)環境下也能保(bao)(bao)持(chi)(chi)較(jiao)好的性(xing)能。無(wu)線(xian)(xian)對講系(xi)(xi)統(tong)(tong)具有發射(she)功(gong)(gong)率小、抗千(qian)擾(rao)(rao)能力(li)(li)強(與有線(xian)(xian)對講系(xi)(xi)統(tong)(tong)比(bi)較(jiao))和(he)(he)抗電磁(ci)(ci)干擾(rao)(rao)能力(li)(li)強(與有線(xian)(xian)對講系(xi)(xi)統(tong)(tong)比(bi)較(jiao))的特點。無(wu)線(xian)(xian)對講系(xi)(xi)統(tong)(tong)發射(she)信(xin)(xin)號(hao)在(zai)(zai)發射(she)前和(he)(he)發射(she)后均能保(bao)(bao)持(chi)(chi)良好的性(xing)能，使用(yong)過程中(zhong)，發射(she)信(xin)(xin)號(hao)與接收信(xin)(xin)號(hao)完全不受任何千(qian)擾(rao)(rao)，可(ke)保(bao)(bao)持(chi)(chi)很好的穩定(ding)性(xing)，具有良好的抗千(qian)擾(rao)(rao)性(xing)和(he)(he)抗低頻干擾(rao)(rao)能力(li)(li)，即使在(zai)(zai)惡劣(lie)的環境下也能保(bao)(bao)持(chi)(chi)較(jiao)好的性(xing)能。因此(ci)無(wu)線(xian)(xian)系(xi)(xi)統(tong)(tong)有較(jiao)高(gao)的可(ke)靠(kao)性(xing)。

2.功耗(hao)小、不受天氣、濕度的影響

無(wu)(wu)線(xian)對(dui)講(jiang)系(xi)(xi)統(tong)(tong)在不同(tong)的(de)(de)(de)環境(jing)(jing)中，無(wu)(wu)線(xian)通信(xin)(xin)設(she)備(bei)(bei)和(he)有(you)線(xian)通信(xin)(xin)設(she)備(bei)(bei)一(yi)樣都要進行(xing)電(dian)(dian)能(neng)的(de)(de)(de)消耗。當環境(jing)(jing)溫度(du)在-40°C以下時(shi)，無(wu)(wu)線(xian)通信(xin)(xin)設(she)備(bei)(bei)需要每天工(gong)作(zuo)8小時(shi)左右;當環境(jing)(jing)溫度(du)為(wei)-20°C時(shi)，每天工(gong)作(zuo)8小時(shi)左右;當環境(jing)(jing)溫度(du)為(wei)-30°C時(shi)，每天工(gong)作(zuo)4小時(shi)左右。目(mu)前(qian)市場上常見的(de)(de)(de)無(wu)(wu)線(xian)對(dui)講(jiang)系(xi)(xi)統(tong)(tong)有(you)兩種電(dian)(dian)源(yuan)(yuan)輸入(ru)方式(shi)(shi)，一(yi)種是電(dian)(dian)源(yuan)(yuan)輸入(ru)，另(ling)一(yi)種是電(dian)(dian)源(yuan)(yuan)輸出。從這兩種方式(shi)(shi)對(dui)系(xi)(xi)統(tong)(tong)的(de)(de)(de)功耗來看，電(dian)(dian)源(yuan)(yuan)輸入(ru)方式(shi)(shi)的(de)(de)(de)功耗更大(da)一(yi)些，但是功耗很小。并且設(she)備(bei)(bei)的(de)(de)(de)工(gong)作(zuo)環境(jing)(jing)不同(tong)，對(dui)電(dian)(dian)池的(de)(de)(de)需求量也不同(tong)，所以功耗也不同(tong)。

3信號不受干擾

在一(yi)些有干(gan)擾(rao)(rao)(rao)的(de)(de)(de)(de)地方(fang)，例(li)如(ru)野(ye)外(wai)、機場、工廠等(deng)，一(yi)般(ban)采(cai)用(yong)(yong)(yong)(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)方(fang)式。分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)方(fang)式的(de)(de)(de)(de)抗(kang)干(gan)擾(rao)(rao)(rao)能力(li)(li)不強(qiang)，其(qi)抗(kang)干(gan)擾(rao)(rao)(rao)能力(li)(li)主要取決于射(she)頻(pin)(pin)(pin)(pin)(pin)功率(lv)的(de)(de)(de)(de)大(da)小。分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技術的(de)(de)(de)(de)功率(lv)一(yi)般(ban)是50dB在50dB左右時，其(qi)抗(kang)干(gan)擾(rao)(rao)(rao)能力(li)(li)強(qiang)。但由(you)于分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)的(de)(de)(de)(de)干(gan)擾(rao)(rao)(rao)與噪聲(sheng)(主要是周邊噪聲(sheng))具有很(hen)強(qiang)的(de)(de)(de)(de)互通性，當分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)發(fa)射(she)的(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)超(chao)過(guo)50dB時，其(qi)抗(kang)千(qian)(qian)擾(rao)(rao)(rao)能力(li)(li)就(jiu)會減弱(ruo)。另外(wai)，在一(yi)些有噪音的(de)(de)(de)(de)環境(jing)中(zhong)使(shi)(shi)用(yong)(yong)(yong)(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技術，會使(shi)(shi)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)無(wu)法到(dao)達發(fa)射(she)端(duan)的(de)(de)(de)(de)接收(shou)機或(huo)(huo)者造成(cheng)發(fa)射(she)端(duan)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)與接收(shou)端(duan)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)糟合而造成(cheng)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)或(huo)(huo)干(gan)擾(rao)(rao)(rao)(例(li)如(ru)在使(shi)(shi)用(yong)(yong)(yong)(yong)(yong)室外(wai)電話時) 。而采(cai)用(yong)(yong)(yong)(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技術的(de)(de)(de)(de)無(wu)線對講系(xi)統(tong)由(you)于發(fa)射(she)功率(lv)小，分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)后(hou)的(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)度比有線對講系(xi)統(tong)高很(hen)多(duo)(在實(shi)際使(shi)(shi)用(yong)(yong)(yong)(yong)(yong)中(zhong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)設備(bei)一(yi)般(ban)可(ke)以將系(xi)統(tong)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)到(dao)50dB以上(shang)),信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)不受干(gan)擾(rao)(rao)(rao)。如(ru)果(guo)采(cai)用(yong)(yong)(yong)(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技術，需要在較(jiao)大(da)的(de)(de)(de)(de)回波功率(lv)下才能實(shi)現信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)工作(zuo)(如(ru)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)器發(fa)射(she)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)與接收(shou)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)重疊時產生的(de)(de)(de)(de)千(qian)(qian)擾(rao)(rao)(rao))和發(fa)送信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)度降低(同(tong)(tong)頻(pin)(pin)(pin)(pin)(pin)帶內的(de)(de)(de)(de)兩只天線對同(tong)(tong)一(yi)信(xin)(xin)(xin)(xin)道傳(chuan)輸的(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)度基本(ben)一(yi)致);如(ru)果(guo)采(cai)用(yong)(yong)(yong)(yong)(yong)混響技術，則可(ke)以實(shi)現對無(wu)線信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)干(gan)擾(rao)(rao)(rao)的(de)(de)(de)(de)抑制或(huo)(huo)降低。