由(you)于在(zai)(zai)戶(hu)外(wai)(wai)、室內等(deng)區域，無(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)的信(xin)(xin)(xin)號強度(du)較弱，而且采用(yong)(yong)頻(pin)率調制技術（如(ru) MHZ、 NMR、 BSI等(deng)）產(chan)生的信(xin)(xin)(xin)號傳(chuan)輸時(shi)(shi)(shi)延(yan)大，傳(chuan)輸距(ju)(ju)離遠。因此(ci)有(you)線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)不適合在(zai)(zai)戶(hu)外(wai)(wai)環境使(shi)(shi)用(yong)(yong)，特別(bie)(bie)是在(zai)(zai)冬天及低風(feng)速季節(jie)使(shi)(shi)用(yong)(yong)。雖(sui)然無(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)也有(you)著不錯的效(xiao)果(guo)。但由(you)于系(xi)(xi)統(tong)(tong)工作時(shi)(shi)(shi)會有(you)一定的干擾，使(shi)(shi)對(dui)講(jiang)(jiang)效(xiao)果(guo)下(xia)(xia)降，另外(wai)(wai)在(zai)(zai)信(xin)(xin)(xin)號較弱時(shi)(shi)(shi)對(dui)用(yong)(yong)戶(hu)語(yu)音(yin)產(chan)生了影響。特別(bie)(bie)是在(zai)(zai)人(ren)員復雜(za)、通(tong)信(xin)(xin)(xin)距(ju)(ju)離較短或(huo)需要較長時(shi)(shi)(shi)間使(shi)(shi)用(yong)(yong)時(shi)(shi)(shi)。因此(ci)，更需要有(you)一個可靠的無(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)提供(gong)與(yu)有(you)線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)一樣的語(yu)音(yin)信(xin)(xin)(xin)息(xi)與(yu)控制。無(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)具有(you)很高(gao)的靈活性，它(ta)能(neng)夠滿足現場中所有(you)環境使(shi)(shi)用(yong)(yong)需求并能(neng)隨時(shi)(shi)(shi)切換（如(ru)在(zai)(zai)野(ye)外(wai)(wai)、戶(hu)外(wai)(wai)電話(hua)等(deng)),用(yong)(yong)戶(hu)可以(yi)在(zai)(zai)任何地點(dian)(dian)使(shi)(shi)用(yong)(yong)、隨時(shi)(shi)(shi)、隨地進行通(tong)訊。使(shi)(shi)用(yong)(yong)方便、節(jie)省成本、節(jie)約費用(yong)(yong)。下(xia)(xia)面我們(men)來了解一下(xia)(xia)無(wu)線(xian)對(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)它(ta)主要是什么(me)優(you)點(dian)(dian)？

1.性能穩定，可(ke)靠性高

在(zai)相同無線(xian)(xian)(xian)(xian)傳(chuan)輸距(ju)離(li)下(xia)，無線(xian)(xian)(xian)(xian)傳(chuan)輸信(xin)(xin)號(hao)更(geng)穩定(ding)由于使(shi)(shi)用了功(gong)率放大(da)器來對無線(xian)(xian)(xian)(xian)信(xin)(xin)號(hao)進(jin)行壓縮和放大(da)，使(shi)(shi)無線(xian)(xian)(xian)(xian)信(xin)(xin)號(hao)更(geng)加穩定(ding)可靠(kao)。無線(xian)(xian)(xian)(xian)信(xin)(xin)號(hao)在(zai)弱電磁(ci)環(huan)境(jing)下(xia)也能(neng)保(bao)(bao)持(chi)(chi)較(jiao)(jiao)好(hao)(hao)的(de)(de)性(xing)(xing)能(neng)。無線(xian)(xian)(xian)(xian)對講(jiang)(jiang)系(xi)統(tong)(tong)具有發(fa)(fa)射(she)功(gong)率小、抗(kang)千(qian)擾(rao)能(neng)力強(qiang)(與(yu)有線(xian)(xian)(xian)(xian)對講(jiang)(jiang)系(xi)統(tong)(tong)比較(jiao)(jiao))和抗(kang)電磁(ci)干擾(rao)能(neng)力強(qiang)(與(yu)有線(xian)(xian)(xian)(xian)對講(jiang)(jiang)系(xi)統(tong)(tong)比較(jiao)(jiao))的(de)(de)特點(dian)。無線(xian)(xian)(xian)(xian)對講(jiang)(jiang)系(xi)統(tong)(tong)發(fa)(fa)射(she)信(xin)(xin)號(hao)在(zai)發(fa)(fa)射(she)前和發(fa)(fa)射(she)后(hou)均能(neng)保(bao)(bao)持(chi)(chi)良好(hao)(hao)的(de)(de)性(xing)(xing)能(neng)，使(shi)(shi)用過程中(zhong)，發(fa)(fa)射(she)信(xin)(xin)號(hao)與(yu)接收(shou)信(xin)(xin)號(hao)完全不(bu)受任何千(qian)擾(rao)，可保(bao)(bao)持(chi)(chi)很好(hao)(hao)的(de)(de)穩定(ding)性(xing)(xing)，具有良好(hao)(hao)的(de)(de)抗(kang)千(qian)擾(rao)性(xing)(xing)和抗(kang)低頻(pin)干擾(rao)能(neng)力，即(ji)使(shi)(shi)在(zai)惡劣的(de)(de)環(huan)境(jing)下(xia)也能(neng)保(bao)(bao)持(chi)(chi)較(jiao)(jiao)好(hao)(hao)的(de)(de)性(xing)(xing)能(neng)。因此無線(xian)(xian)(xian)(xian)系(xi)統(tong)(tong)有較(jiao)(jiao)高的(de)(de)可靠(kao)性(xing)(xing)。

2.功(gong)耗(hao)小、不受天(tian)氣、濕度的影(ying)響

無(wu)線(xian)對(dui)講(jiang)系(xi)(xi)統(tong)在(zai)不同(tong)的(de)(de)環境中，無(wu)線(xian)通信設備和(he)有線(xian)通信設備一樣都要(yao)進行電能(neng)的(de)(de)消耗。當(dang)環境溫度(du)在(zai)-40°C以(yi)下時，無(wu)線(xian)通信設備需(xu)要(yao)每天(tian)工(gong)(gong)作(zuo)8小時左(zuo)右(you);當(dang)環境溫度(du)為-20°C時，每天(tian)工(gong)(gong)作(zuo)8小時左(zuo)右(you);當(dang)環境溫度(du)為-30°C時，每天(tian)工(gong)(gong)作(zuo)4小時左(zuo)右(you)。目前市場(chang)上常見的(de)(de)無(wu)線(xian)對(dui)講(jiang)系(xi)(xi)統(tong)有兩種(zhong)(zhong)(zhong)電源(yuan)(yuan)輸(shu)入(ru)方式，一種(zhong)(zhong)(zhong)是電源(yuan)(yuan)輸(shu)入(ru)，另一種(zhong)(zhong)(zhong)是電源(yuan)(yuan)輸(shu)出。從這兩種(zhong)(zhong)(zhong)方式對(dui)系(xi)(xi)統(tong)的(de)(de)功(gong)(gong)(gong)耗來看(kan)，電源(yuan)(yuan)輸(shu)入(ru)方式的(de)(de)功(gong)(gong)(gong)耗更大一些，但是功(gong)(gong)(gong)耗很(hen)小。并且設備的(de)(de)工(gong)(gong)作(zuo)環境不同(tong)，對(dui)電池的(de)(de)需(xu)求量也不同(tong)，所以(yi)功(gong)(gong)(gong)耗也不同(tong)。

3信號不受干擾

在(zai)一(yi)(yi)些有干(gan)擾(rao)的(de)地(di)方(fang)，例如野外(wai)、機場、工(gong)廠等，一(yi)(yi)般(ban)采(cai)用(yong)分(fen)頻(pin)(pin)(pin)方(fang)式(shi)。分(fen)頻(pin)(pin)(pin)方(fang)式(shi)的(de)抗(kang)干(gan)擾(rao)能力(li)不(bu)(bu)強(qiang)，其抗(kang)干(gan)擾(rao)能力(li)主要(yao)取決于(yu)射(she)(she)頻(pin)(pin)(pin)功率(lv)的(de)大小(xiao)。分(fen)頻(pin)(pin)(pin)技術(shu)的(de)功率(lv)一(yi)(yi)般(ban)是(shi)50dB在(zai)50dB左右時(shi)(shi)，其抗(kang)干(gan)擾(rao)能力(li)強(qiang)。但由于(yu)分(fen)頻(pin)(pin)(pin)的(de)干(gan)擾(rao)與噪聲(sheng)(主要(yao)是(shi)周邊噪聲(sheng))具有很強(qiang)的(de)互通(tong)性，當(dang)分(fen)頻(pin)(pin)(pin)發(fa)(fa)射(she)(she)的(de)信(xin)(xin)(xin)號(hao)(hao)超過50dB時(shi)(shi)，其抗(kang)千擾(rao)能力(li)就(jiu)會減(jian)弱(ruo)。另(ling)外(wai)，在(zai)一(yi)(yi)些有噪音的(de)環境中使用(yong)分(fen)頻(pin)(pin)(pin)技術(shu)，會使分(fen)頻(pin)(pin)(pin)信(xin)(xin)(xin)號(hao)(hao)無(wu)法到達發(fa)(fa)射(she)(she)端的(de)接收(shou)機或(huo)者造成發(fa)(fa)射(she)(she)端信(xin)(xin)(xin)號(hao)(hao)與接收(shou)端信(xin)(xin)(xin)號(hao)(hao)的(de)糟合而(er)造成分(fen)頻(pin)(pin)(pin)或(huo)干(gan)擾(rao)(例如在(zai)使用(yong)室外(wai)電話時(shi)(shi)) 。而(er)采(cai)用(yong)分(fen)頻(pin)(pin)(pin)技術(shu)的(de)無(wu)線對(dui)講系統由于(yu)發(fa)(fa)射(she)(she)功率(lv)小(xiao)，分(fen)頻(pin)(pin)(pin)后的(de)信(xin)(xin)(xin)號(hao)(hao)強(qiang)度(du)比(bi)有線對(dui)講系統高很多(在(zai)實際使用(yong)中分(fen)頻(pin)(pin)(pin)設備一(yi)(yi)般(ban)可(ke)以將系統信(xin)(xin)(xin)號(hao)(hao)分(fen)頻(pin)(pin)(pin)到50dB以上),信(xin)(xin)(xin)號(hao)(hao)不(bu)(bu)受(shou)干(gan)擾(rao)。如果采(cai)用(yong)分(fen)頻(pin)(pin)(pin)技術(shu)，需要(yao)在(zai)較(jiao)大的(de)回波功率(lv)下才能實現(xian)信(xin)(xin)(xin)號(hao)(hao)的(de)分(fen)頻(pin)(pin)(pin)工(gong)作(zuo)(如分(fen)頻(pin)(pin)(pin)器(qi)發(fa)(fa)射(she)(she)信(xin)(xin)(xin)號(hao)(hao)與接收(shou)信(xin)(xin)(xin)號(hao)(hao)重疊(die)時(shi)(shi)產生(sheng)的(de)千擾(rao))和發(fa)(fa)送信(xin)(xin)(xin)號(hao)(hao)強(qiang)度(du)降低(di)(同頻(pin)(pin)(pin)帶內的(de)兩只天線對(dui)同一(yi)(yi)信(xin)(xin)(xin)道傳輸(shu)的(de)信(xin)(xin)(xin)號(hao)(hao)強(qiang)度(du)基本(ben)一(yi)(yi)致);如果采(cai)用(yong)混響技術(shu)，則(ze)可(ke)以實現(xian)對(dui)無(wu)線信(xin)(xin)(xin)號(hao)(hao)干(gan)擾(rao)的(de)抑制或(huo)降低(di)。