由于(yu)在戶外(wai)(wai)(wai)(wai)、室內等(deng)區域，無(wu)線(xian)(xian)(xian)(xian)對(dui)(dui)講(jiang)系(xi)統(tong)(tong)的(de)信(xin)(xin)號(hao)強度較弱(ruo)，而且采用(yong)(yong)頻(pin)率調(diao)制(zhi)技術（如 MHZ、 NMR、 BSI等(deng)）產生(sheng)的(de)信(xin)(xin)號(hao)傳輸時延大，傳輸距離(li)遠。因此有(you)線(xian)(xian)(xian)(xian)對(dui)(dui)講(jiang)系(xi)統(tong)(tong)不適合在戶外(wai)(wai)(wai)(wai)環境(jing)使(shi)用(yong)(yong)，特別是(shi)在冬天及低風速季節(jie)使(shi)用(yong)(yong)。雖(sui)然(ran)無(wu)線(xian)(xian)(xian)(xian)對(dui)(dui)講(jiang)系(xi)統(tong)(tong)也有(you)著(zhu)不錯的(de)效果(guo)。但(dan)由于(yu)系(xi)統(tong)(tong)工(gong)作時會有(you)一定的(de)干擾，使(shi)對(dui)(dui)講(jiang)效果(guo)下(xia)降，另外(wai)(wai)(wai)(wai)在信(xin)(xin)號(hao)較弱(ruo)時對(dui)(dui)用(yong)(yong)戶語(yu)音產生(sheng)了影響(xiang)。特別是(shi)在人員復雜(za)、通信(xin)(xin)距離(li)較短或需(xu)要較長時間使(shi)用(yong)(yong)時。因此，更需(xu)要有(you)一個可(ke)靠的(de)無(wu)線(xian)(xian)(xian)(xian)對(dui)(dui)講(jiang)系(xi)統(tong)(tong)提供與(yu)有(you)線(xian)(xian)(xian)(xian)對(dui)(dui)講(jiang)系(xi)統(tong)(tong)一樣的(de)語(yu)音信(xin)(xin)息與(yu)控制(zhi)。無(wu)線(xian)(xian)(xian)(xian)對(dui)(dui)講(jiang)系(xi)統(tong)(tong)具有(you)很高(gao)的(de)靈(ling)活性，它(ta)能夠滿足(zu)現場中所有(you)環境(jing)使(shi)用(yong)(yong)需(xu)求并能隨(sui)(sui)時切換(huan)（如在野外(wai)(wai)(wai)(wai)、戶外(wai)(wai)(wai)(wai)電(dian)話等(deng)),用(yong)(yong)戶可(ke)以(yi)在任何(he)地點使(shi)用(yong)(yong)、隨(sui)(sui)時、隨(sui)(sui)地進行通訊。使(shi)用(yong)(yong)方便、節(jie)省成本、節(jie)約費用(yong)(yong)。下(xia)面我們來了解一下(xia)無(wu)線(xian)(xian)(xian)(xian)對(dui)(dui)講(jiang)系(xi)統(tong)(tong)它(ta)主要是(shi)什(shen)么優點？

1.性能穩定，可(ke)靠(kao)性高

在相同無線(xian)(xian)傳輸(shu)距離(li)下，無線(xian)(xian)傳輸(shu)信號(hao)(hao)更穩定(ding)(ding)(ding)由于使用(yong)了功率放大(da)(da)器來(lai)對無線(xian)(xian)信號(hao)(hao)進行(xing)壓縮和(he)放大(da)(da)，使無線(xian)(xian)信號(hao)(hao)更加穩定(ding)(ding)(ding)可靠(kao)。無線(xian)(xian)信號(hao)(hao)在弱電磁環境(jing)下也能(neng)(neng)保(bao)(bao)持較(jiao)好的(de)(de)性(xing)(xing)能(neng)(neng)。無線(xian)(xian)對講(jiang)系統(tong)具有(you)發射(she)功率小(xiao)、抗(kang)千擾(rao)能(neng)(neng)力(li)強(與有(you)線(xian)(xian)對講(jiang)系統(tong)比較(jiao))和(he)抗(kang)電磁干(gan)擾(rao)能(neng)(neng)力(li)強(與有(you)線(xian)(xian)對講(jiang)系統(tong)比較(jiao))的(de)(de)特點。無線(xian)(xian)對講(jiang)系統(tong)發射(she)信號(hao)(hao)在發射(she)前和(he)發射(she)后均能(neng)(neng)保(bao)(bao)持良(liang)好的(de)(de)性(xing)(xing)能(neng)(neng)，使用(yong)過程中(zhong)，發射(she)信號(hao)(hao)與接收信號(hao)(hao)完(wan)全不受任何千擾(rao)，可保(bao)(bao)持很好的(de)(de)穩定(ding)(ding)(ding)性(xing)(xing)，具有(you)良(liang)好的(de)(de)抗(kang)千擾(rao)性(xing)(xing)和(he)抗(kang)低(di)頻干(gan)擾(rao)能(neng)(neng)力(li)，即使在惡劣的(de)(de)環境(jing)下也能(neng)(neng)保(bao)(bao)持較(jiao)好的(de)(de)性(xing)(xing)能(neng)(neng)。因此無線(xian)(xian)系統(tong)有(you)較(jiao)高的(de)(de)可靠(kao)性(xing)(xing)。

2.功耗小(xiao)、不受天氣、濕度的影響

無線(xian)(xian)對講系(xi)(xi)統在(zai)不(bu)(bu)同(tong)(tong)的(de)(de)環境(jing)(jing)中，無線(xian)(xian)通(tong)信設(she)備(bei)和有線(xian)(xian)通(tong)信設(she)備(bei)一樣(yang)都(dou)要進行(xing)電(dian)(dian)能(neng)的(de)(de)消(xiao)耗(hao)(hao)。當(dang)(dang)環境(jing)(jing)溫度(du)在(zai)-40°C以下時，無線(xian)(xian)通(tong)信設(she)備(bei)需(xu)要每(mei)天工(gong)作(zuo)8小(xiao)(xiao)時左(zuo)右;當(dang)(dang)環境(jing)(jing)溫度(du)為-20°C時，每(mei)天工(gong)作(zuo)8小(xiao)(xiao)時左(zuo)右;當(dang)(dang)環境(jing)(jing)溫度(du)為-30°C時，每(mei)天工(gong)作(zuo)4小(xiao)(xiao)時左(zuo)右。目前市(shi)場上常見(jian)的(de)(de)無線(xian)(xian)對講系(xi)(xi)統有兩(liang)種電(dian)(dian)源輸入方式(shi)，一種是電(dian)(dian)源輸入，另一種是電(dian)(dian)源輸出(chu)。從這兩(liang)種方式(shi)對系(xi)(xi)統的(de)(de)功(gong)耗(hao)(hao)來看，電(dian)(dian)源輸入方式(shi)的(de)(de)功(gong)耗(hao)(hao)更(geng)大一些(xie)，但是功(gong)耗(hao)(hao)很小(xiao)(xiao)。并且設(she)備(bei)的(de)(de)工(gong)作(zuo)環境(jing)(jing)不(bu)(bu)同(tong)(tong)，對電(dian)(dian)池(chi)的(de)(de)需(xu)求(qiu)量也(ye)不(bu)(bu)同(tong)(tong)，所以功(gong)耗(hao)(hao)也(ye)不(bu)(bu)同(tong)(tong)。

3信號不受干擾

在(zai)(zai)一(yi)些有干(gan)(gan)(gan)擾(rao)(rao)(rao)(rao)的(de)(de)(de)(de)(de)地方，例(li)如野外(wai)、機(ji)場(chang)、工(gong)廠等(deng)，一(yi)般采(cai)用(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)方式(shi)。分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)方式(shi)的(de)(de)(de)(de)(de)抗干(gan)(gan)(gan)擾(rao)(rao)(rao)(rao)能(neng)力(li)不強(qiang)，其(qi)抗干(gan)(gan)(gan)擾(rao)(rao)(rao)(rao)能(neng)力(li)主要取決于射(she)(she)(she)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)功(gong)率(lv)的(de)(de)(de)(de)(de)大小(xiao)(xiao)。分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)的(de)(de)(de)(de)(de)功(gong)率(lv)一(yi)般是(shi)50dB在(zai)(zai)50dB左右時，其(qi)抗干(gan)(gan)(gan)擾(rao)(rao)(rao)(rao)能(neng)力(li)強(qiang)。但由(you)于分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)的(de)(de)(de)(de)(de)干(gan)(gan)(gan)擾(rao)(rao)(rao)(rao)與噪聲(主要是(shi)周邊噪聲)具(ju)有很強(qiang)的(de)(de)(de)(de)(de)互通性，當分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)發射(she)(she)(she)的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)(hao)(hao)超(chao)過50dB時，其(qi)抗千擾(rao)(rao)(rao)(rao)能(neng)力(li)就會減弱(ruo)。另外(wai)，在(zai)(zai)一(yi)些有噪音的(de)(de)(de)(de)(de)環境中(zhong)使(shi)(shi)用(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)，會使(shi)(shi)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)(hao)(hao)無(wu)法到達(da)發射(she)(she)(she)端的(de)(de)(de)(de)(de)接(jie)收機(ji)或(huo)者造成發射(she)(she)(she)端信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)(hao)(hao)與接(jie)收端信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)(hao)(hao)的(de)(de)(de)(de)(de)糟(zao)合(he)而造成分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)或(huo)干(gan)(gan)(gan)擾(rao)(rao)(rao)(rao)(例(li)如在(zai)(zai)使(shi)(shi)用(yong)(yong)室外(wai)電話(hua)時) 。而采(cai)用(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)的(de)(de)(de)(de)(de)無(wu)線對(dui)講系(xi)(xi)統由(you)于發射(she)(she)(she)功(gong)率(lv)小(xiao)(xiao)，分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)后的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)(hao)(hao)強(qiang)度(du)(du)比有線對(dui)講系(xi)(xi)統高很多(在(zai)(zai)實際使(shi)(shi)用(yong)(yong)中(zhong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)設備一(yi)般可以(yi)將系(xi)(xi)統信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)(hao)(hao)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)到50dB以(yi)上(shang)),信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)(hao)(hao)不受干(gan)(gan)(gan)擾(rao)(rao)(rao)(rao)。如果采(cai)用(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)，需(xu)要在(zai)(zai)較大的(de)(de)(de)(de)(de)回波功(gong)率(lv)下才能(neng)實現信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)(hao)(hao)的(de)(de)(de)(de)(de)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)工(gong)作(如分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)器發射(she)(she)(she)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)(hao)(hao)與接(jie)收信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)(hao)(hao)重(zhong)疊時產生的(de)(de)(de)(de)(de)千擾(rao)(rao)(rao)(rao))和發送信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)(hao)(hao)強(qiang)度(du)(du)降低(同(tong)(tong)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)帶內的(de)(de)(de)(de)(de)兩只天(tian)線對(dui)同(tong)(tong)一(yi)信(xin)(xin)(xin)(xin)(xin)道傳輸的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)(hao)(hao)強(qiang)度(du)(du)基本一(yi)致(zhi));如果采(cai)用(yong)(yong)混響技術(shu)，則可以(yi)實現對(dui)無(wu)線信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)(hao)(hao)干(gan)(gan)(gan)擾(rao)(rao)(rao)(rao)的(de)(de)(de)(de)(de)抑制或(huo)降低。