由(you)于在(zai)(zai)(zai)戶(hu)外(wai)(wai)、室內等(deng)區域，無線(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)的(de)(de)信號(hao)強(qiang)度較(jiao)弱，而且采用(yong)(yong)頻(pin)率調制技術（如 MHZ、 NMR、 BSI等(deng)）產生的(de)(de)信號(hao)傳(chuan)輸時延大，傳(chuan)輸距離(li)遠。因此(ci)有(you)(you)線(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)不(bu)適合在(zai)(zai)(zai)戶(hu)外(wai)(wai)環(huan)境使(shi)用(yong)(yong)，特別是在(zai)(zai)(zai)冬(dong)天及低風(feng)速季節使(shi)用(yong)(yong)。雖然無線(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)也(ye)有(you)(you)著不(bu)錯的(de)(de)效(xiao)果(guo)。但由(you)于系(xi)統(tong)(tong)工作時會有(you)(you)一(yi)定的(de)(de)干擾，使(shi)對(dui)(dui)講(jiang)(jiang)效(xiao)果(guo)下(xia)降，另外(wai)(wai)在(zai)(zai)(zai)信號(hao)較(jiao)弱時對(dui)(dui)用(yong)(yong)戶(hu)語(yu)音產生了影響。特別是在(zai)(zai)(zai)人員復雜、通信距離(li)較(jiao)短或需要較(jiao)長時間使(shi)用(yong)(yong)時。因此(ci)，更(geng)需要有(you)(you)一(yi)個可(ke)靠的(de)(de)無線(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)提供(gong)與有(you)(you)線(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)一(yi)樣(yang)的(de)(de)語(yu)音信息與控制。無線(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)具有(you)(you)很高的(de)(de)靈活性，它(ta)能夠滿(man)足現場中(zhong)所有(you)(you)環(huan)境使(shi)用(yong)(yong)需求并能隨時切換（如在(zai)(zai)(zai)野外(wai)(wai)、戶(hu)外(wai)(wai)電話(hua)等(deng)),用(yong)(yong)戶(hu)可(ke)以(yi)在(zai)(zai)(zai)任何地(di)點(dian)使(shi)用(yong)(yong)、隨時、隨地(di)進行通訊。使(shi)用(yong)(yong)方便、節省成(cheng)本、節約費用(yong)(yong)。下(xia)面我們來了解(jie)一(yi)下(xia)無線(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)它(ta)主要是什(shen)么優點(dian)？

1.性(xing)(xing)能穩定(ding)，可靠性(xing)(xing)高

在相同無(wu)線(xian)(xian)(xian)(xian)傳輸距離下(xia)，無(wu)線(xian)(xian)(xian)(xian)傳輸信(xin)(xin)(xin)號(hao)更(geng)穩定(ding)由(you)于使(shi)(shi)用了(le)功率(lv)放(fang)大(da)器來對無(wu)線(xian)(xian)(xian)(xian)信(xin)(xin)(xin)號(hao)進行壓縮和放(fang)大(da)，使(shi)(shi)無(wu)線(xian)(xian)(xian)(xian)信(xin)(xin)(xin)號(hao)更(geng)加(jia)穩定(ding)可(ke)靠。無(wu)線(xian)(xian)(xian)(xian)信(xin)(xin)(xin)號(hao)在弱電磁環境下(xia)也能(neng)(neng)保持較(jiao)(jiao)好的性(xing)能(neng)(neng)。無(wu)線(xian)(xian)(xian)(xian)對講系統(tong)具(ju)有(you)發射(she)功率(lv)小、抗千擾能(neng)(neng)力強(qiang)(與(yu)有(you)線(xian)(xian)(xian)(xian)對講系統(tong)比(bi)較(jiao)(jiao))和抗電磁干擾能(neng)(neng)力強(qiang)(與(yu)有(you)線(xian)(xian)(xian)(xian)對講系統(tong)比(bi)較(jiao)(jiao))的特點。無(wu)線(xian)(xian)(xian)(xian)對講系統(tong)發射(she)信(xin)(xin)(xin)號(hao)在發射(she)前和發射(she)后均能(neng)(neng)保持良(liang)好的性(xing)能(neng)(neng)，使(shi)(shi)用過程中(zhong)，發射(she)信(xin)(xin)(xin)號(hao)與(yu)接收(shou)信(xin)(xin)(xin)號(hao)完全不受任何千擾，可(ke)保持很好的穩定(ding)性(xing)，具(ju)有(you)良(liang)好的抗千擾性(xing)和抗低頻干擾能(neng)(neng)力，即使(shi)(shi)在惡(e)劣的環境下(xia)也能(neng)(neng)保持較(jiao)(jiao)好的性(xing)能(neng)(neng)。因此無(wu)線(xian)(xian)(xian)(xian)系統(tong)有(you)較(jiao)(jiao)高的可(ke)靠性(xing)。

2.功(gong)耗(hao)小(xiao)、不受天氣(qi)、濕度的(de)影響

無(wu)(wu)線(xian)(xian)對講系(xi)統(tong)在(zai)不(bu)同(tong)(tong)的(de)環(huan)境(jing)(jing)中，無(wu)(wu)線(xian)(xian)通(tong)信設備和有線(xian)(xian)通(tong)信設備一(yi)(yi)樣都(dou)要進行(xing)電(dian)(dian)(dian)能的(de)消(xiao)耗。當(dang)環(huan)境(jing)(jing)溫度在(zai)-40°C以下時(shi)(shi)，無(wu)(wu)線(xian)(xian)通(tong)信設備需(xu)要每天(tian)(tian)工作(zuo)8小(xiao)時(shi)(shi)左右;當(dang)環(huan)境(jing)(jing)溫度為-20°C時(shi)(shi)，每天(tian)(tian)工作(zuo)8小(xiao)時(shi)(shi)左右;當(dang)環(huan)境(jing)(jing)溫度為-30°C時(shi)(shi)，每天(tian)(tian)工作(zuo)4小(xiao)時(shi)(shi)左右。目前市(shi)場上常見(jian)的(de)無(wu)(wu)線(xian)(xian)對講系(xi)統(tong)有兩種(zhong)電(dian)(dian)(dian)源(yuan)輸(shu)入(ru)方式，一(yi)(yi)種(zhong)是(shi)(shi)電(dian)(dian)(dian)源(yuan)輸(shu)入(ru)，另一(yi)(yi)種(zhong)是(shi)(shi)電(dian)(dian)(dian)源(yuan)輸(shu)出。從這兩種(zhong)方式對系(xi)統(tong)的(de)功(gong)耗來看，電(dian)(dian)(dian)源(yuan)輸(shu)入(ru)方式的(de)功(gong)耗更大一(yi)(yi)些，但(dan)是(shi)(shi)功(gong)耗很小(xiao)。并且設備的(de)工作(zuo)環(huan)境(jing)(jing)不(bu)同(tong)(tong)，對電(dian)(dian)(dian)池的(de)需(xu)求量也不(bu)同(tong)(tong)，所以功(gong)耗也不(bu)同(tong)(tong)。

3信號不受干擾

在(zai)一(yi)些有(you)干(gan)擾(rao)(rao)(rao)(rao)的(de)(de)(de)(de)(de)(de)(de)地(di)方，例如(ru)(ru)(ru)野外(wai)(wai)、機場、工(gong)廠等，一(yi)般(ban)采用(yong)分(fen)(fen)頻(pin)方式。分(fen)(fen)頻(pin)方式的(de)(de)(de)(de)(de)(de)(de)抗干(gan)擾(rao)(rao)(rao)(rao)能(neng)(neng)力(li)(li)不強，其(qi)(qi)抗干(gan)擾(rao)(rao)(rao)(rao)能(neng)(neng)力(li)(li)主(zhu)要取決(jue)于射(she)頻(pin)功(gong)率(lv)的(de)(de)(de)(de)(de)(de)(de)大小(xiao)。分(fen)(fen)頻(pin)技(ji)術(shu)的(de)(de)(de)(de)(de)(de)(de)功(gong)率(lv)一(yi)般(ban)是(shi)50dB在(zai)50dB左右時(shi)，其(qi)(qi)抗干(gan)擾(rao)(rao)(rao)(rao)能(neng)(neng)力(li)(li)強。但(dan)由(you)于分(fen)(fen)頻(pin)的(de)(de)(de)(de)(de)(de)(de)干(gan)擾(rao)(rao)(rao)(rao)與噪聲(主(zhu)要是(shi)周邊(bian)噪聲)具有(you)很(hen)強的(de)(de)(de)(de)(de)(de)(de)互通性，當(dang)分(fen)(fen)頻(pin)發射(she)的(de)(de)(de)(de)(de)(de)(de)信(xin)號(hao)超過50dB時(shi)，其(qi)(qi)抗千(qian)擾(rao)(rao)(rao)(rao)能(neng)(neng)力(li)(li)就會減弱。另(ling)外(wai)(wai)，在(zai)一(yi)些有(you)噪音的(de)(de)(de)(de)(de)(de)(de)環境中使用(yong)分(fen)(fen)頻(pin)技(ji)術(shu)，會使分(fen)(fen)頻(pin)信(xin)號(hao)無法到(dao)達發射(she)端的(de)(de)(de)(de)(de)(de)(de)接收(shou)機或(huo)者造(zao)成發射(she)端信(xin)號(hao)與接收(shou)端信(xin)號(hao)的(de)(de)(de)(de)(de)(de)(de)糟合而造(zao)成分(fen)(fen)頻(pin)或(huo)干(gan)擾(rao)(rao)(rao)(rao)(例如(ru)(ru)(ru)在(zai)使用(yong)室(shi)外(wai)(wai)電話時(shi)) 。而采用(yong)分(fen)(fen)頻(pin)技(ji)術(shu)的(de)(de)(de)(de)(de)(de)(de)無線(xian)(xian)對講(jiang)(jiang)系統(tong)(tong)由(you)于發射(she)功(gong)率(lv)小(xiao)，分(fen)(fen)頻(pin)后的(de)(de)(de)(de)(de)(de)(de)信(xin)號(hao)強度比有(you)線(xian)(xian)對講(jiang)(jiang)系統(tong)(tong)高(gao)很(hen)多(duo)(在(zai)實(shi)際使用(yong)中分(fen)(fen)頻(pin)設備一(yi)般(ban)可(ke)以將系統(tong)(tong)信(xin)號(hao)分(fen)(fen)頻(pin)到(dao)50dB以上),信(xin)號(hao)不受干(gan)擾(rao)(rao)(rao)(rao)。如(ru)(ru)(ru)果采用(yong)分(fen)(fen)頻(pin)技(ji)術(shu)，需要在(zai)較(jiao)大的(de)(de)(de)(de)(de)(de)(de)回波功(gong)率(lv)下(xia)才能(neng)(neng)實(shi)現(xian)信(xin)號(hao)的(de)(de)(de)(de)(de)(de)(de)分(fen)(fen)頻(pin)工(gong)作(如(ru)(ru)(ru)分(fen)(fen)頻(pin)器發射(she)信(xin)號(hao)與接收(shou)信(xin)號(hao)重疊時(shi)產生的(de)(de)(de)(de)(de)(de)(de)千(qian)擾(rao)(rao)(rao)(rao))和發送信(xin)號(hao)強度降低(同頻(pin)帶內的(de)(de)(de)(de)(de)(de)(de)兩只天(tian)線(xian)(xian)對同一(yi)信(xin)道傳輸的(de)(de)(de)(de)(de)(de)(de)信(xin)號(hao)強度基本(ben)一(yi)致);如(ru)(ru)(ru)果采用(yong)混響技(ji)術(shu)，則可(ke)以實(shi)現(xian)對無線(xian)(xian)信(xin)號(hao)干(gan)擾(rao)(rao)(rao)(rao)的(de)(de)(de)(de)(de)(de)(de)抑制或(huo)降低。