由于(yu)在(zai)(zai)戶外(wai)(wai)(wai)、室(shi)內等(deng)區域，無(wu)線(xian)(xian)對(dui)講(jiang)系(xi)(xi)統(tong)(tong)的(de)信號(hao)強度(du)較(jiao)(jiao)弱(ruo)，而且采(cai)用(yong)頻率調制(zhi)技術（如 MHZ、 NMR、 BSI等(deng)）產(chan)生的(de)信號(hao)傳輸時(shi)延(yan)大(da)，傳輸距(ju)離遠。因(yin)此(ci)有(you)線(xian)(xian)對(dui)講(jiang)系(xi)(xi)統(tong)(tong)不適(shi)合在(zai)(zai)戶外(wai)(wai)(wai)環(huan)境(jing)使(shi)(shi)(shi)用(yong)，特別(bie)是(shi)在(zai)(zai)冬天及低風(feng)速季節(jie)使(shi)(shi)(shi)用(yong)。雖(sui)然無(wu)線(xian)(xian)對(dui)講(jiang)系(xi)(xi)統(tong)(tong)也(ye)有(you)著不錯的(de)效果(guo)。但由于(yu)系(xi)(xi)統(tong)(tong)工作(zuo)時(shi)會有(you)一定(ding)的(de)干擾(rao)，使(shi)(shi)(shi)對(dui)講(jiang)效果(guo)下降，另(ling)外(wai)(wai)(wai)在(zai)(zai)信號(hao)較(jiao)(jiao)弱(ruo)時(shi)對(dui)用(yong)戶語音產(chan)生了(le)影(ying)響(xiang)。特別(bie)是(shi)在(zai)(zai)人員復雜、通信距(ju)離較(jiao)(jiao)短或需要(yao)較(jiao)(jiao)長時(shi)間使(shi)(shi)(shi)用(yong)時(shi)。因(yin)此(ci)，更需要(yao)有(you)一個可靠的(de)無(wu)線(xian)(xian)對(dui)講(jiang)系(xi)(xi)統(tong)(tong)提供與有(you)線(xian)(xian)對(dui)講(jiang)系(xi)(xi)統(tong)(tong)一樣的(de)語音信息(xi)與控制(zhi)。無(wu)線(xian)(xian)對(dui)講(jiang)系(xi)(xi)統(tong)(tong)具有(you)很高的(de)靈活性，它(ta)能(neng)夠滿足現場中所(suo)有(you)環(huan)境(jing)使(shi)(shi)(shi)用(yong)需求并能(neng)隨(sui)時(shi)切(qie)換(huan)（如在(zai)(zai)野外(wai)(wai)(wai)、戶外(wai)(wai)(wai)電(dian)話等(deng)),用(yong)戶可以在(zai)(zai)任何地點使(shi)(shi)(shi)用(yong)、隨(sui)時(shi)、隨(sui)地進行通訊。使(shi)(shi)(shi)用(yong)方(fang)便、節(jie)省(sheng)成(cheng)本、節(jie)約費用(yong)。下面我們來了(le)解一下無(wu)線(xian)(xian)對(dui)講(jiang)系(xi)(xi)統(tong)(tong)它(ta)主要(yao)是(shi)什么優點？

1.性(xing)能(neng)穩定(ding)，可靠性(xing)高

在(zai)相同(tong)無(wu)(wu)線(xian)(xian)傳(chuan)輸距離下，無(wu)(wu)線(xian)(xian)傳(chuan)輸信號(hao)(hao)(hao)更(geng)穩定(ding)(ding)由于(yu)使用了功率(lv)放(fang)(fang)大器來(lai)對(dui)無(wu)(wu)線(xian)(xian)信號(hao)(hao)(hao)進行壓縮(suo)和(he)放(fang)(fang)大，使無(wu)(wu)線(xian)(xian)信號(hao)(hao)(hao)更(geng)加穩定(ding)(ding)可靠。無(wu)(wu)線(xian)(xian)信號(hao)(hao)(hao)在(zai)弱電(dian)磁環境下也能(neng)保(bao)持較(jiao)(jiao)好(hao)的(de)(de)(de)性(xing)能(neng)。無(wu)(wu)線(xian)(xian)對(dui)講(jiang)系(xi)統(tong)(tong)具(ju)有發射功率(lv)小、抗千擾(rao)能(neng)力強(qiang)(與(yu)有線(xian)(xian)對(dui)講(jiang)系(xi)統(tong)(tong)比(bi)較(jiao)(jiao))和(he)抗電(dian)磁干擾(rao)能(neng)力強(qiang)(與(yu)有線(xian)(xian)對(dui)講(jiang)系(xi)統(tong)(tong)比(bi)較(jiao)(jiao))的(de)(de)(de)特(te)點(dian)。無(wu)(wu)線(xian)(xian)對(dui)講(jiang)系(xi)統(tong)(tong)發射信號(hao)(hao)(hao)在(zai)發射前和(he)發射后均能(neng)保(bao)持良好(hao)的(de)(de)(de)性(xing)能(neng)，使用過程(cheng)中，發射信號(hao)(hao)(hao)與(yu)接收信號(hao)(hao)(hao)完全不受任(ren)何千擾(rao)，可保(bao)持很好(hao)的(de)(de)(de)穩定(ding)(ding)性(xing)，具(ju)有良好(hao)的(de)(de)(de)抗千擾(rao)性(xing)和(he)抗低頻干擾(rao)能(neng)力，即使在(zai)惡劣的(de)(de)(de)環境下也能(neng)保(bao)持較(jiao)(jiao)好(hao)的(de)(de)(de)性(xing)能(neng)。因此(ci)無(wu)(wu)線(xian)(xian)系(xi)統(tong)(tong)有較(jiao)(jiao)高的(de)(de)(de)可靠性(xing)。

2.功耗小、不(bu)受天氣(qi)、濕度的影(ying)響(xiang)

無線對(dui)(dui)(dui)講(jiang)系(xi)(xi)統(tong)(tong)在不(bu)同(tong)的(de)(de)(de)環(huan)(huan)境(jing)(jing)中，無線通(tong)(tong)信(xin)設(she)(she)備(bei)和有線通(tong)(tong)信(xin)設(she)(she)備(bei)一(yi)樣都要(yao)進行電能(neng)的(de)(de)(de)消耗(hao)(hao)。當(dang)環(huan)(huan)境(jing)(jing)溫(wen)度在-40°C以下時，無線通(tong)(tong)信(xin)設(she)(she)備(bei)需要(yao)每天(tian)工作(zuo)8小(xiao)時左(zuo)右;當(dang)環(huan)(huan)境(jing)(jing)溫(wen)度為-20°C時，每天(tian)工作(zuo)8小(xiao)時左(zuo)右;當(dang)環(huan)(huan)境(jing)(jing)溫(wen)度為-30°C時，每天(tian)工作(zuo)4小(xiao)時左(zuo)右。目前市場上常見(jian)的(de)(de)(de)無線對(dui)(dui)(dui)講(jiang)系(xi)(xi)統(tong)(tong)有兩(liang)種(zhong)(zhong)(zhong)電源(yuan)(yuan)(yuan)輸入(ru)方(fang)式(shi)，一(yi)種(zhong)(zhong)(zhong)是電源(yuan)(yuan)(yuan)輸入(ru)，另一(yi)種(zhong)(zhong)(zhong)是電源(yuan)(yuan)(yuan)輸出。從這兩(liang)種(zhong)(zhong)(zhong)方(fang)式(shi)對(dui)(dui)(dui)系(xi)(xi)統(tong)(tong)的(de)(de)(de)功耗(hao)(hao)來看(kan)，電源(yuan)(yuan)(yuan)輸入(ru)方(fang)式(shi)的(de)(de)(de)功耗(hao)(hao)更大(da)一(yi)些，但是功耗(hao)(hao)很小(xiao)。并且(qie)設(she)(she)備(bei)的(de)(de)(de)工作(zuo)環(huan)(huan)境(jing)(jing)不(bu)同(tong)，對(dui)(dui)(dui)電池的(de)(de)(de)需求量(liang)也(ye)不(bu)同(tong)，所(suo)以功耗(hao)(hao)也(ye)不(bu)同(tong)。

3信號不受干擾

在(zai)一(yi)(yi)些有干擾(rao)(rao)的(de)(de)地方(fang)，例如(ru)(ru)(ru)(ru)野外(wai)、機場、工廠等，一(yi)(yi)般采用(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)方(fang)式(shi)。分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)方(fang)式(shi)的(de)(de)抗(kang)(kang)干擾(rao)(rao)能力(li)不強，其抗(kang)(kang)干擾(rao)(rao)能力(li)主要取決于射(she)(she)頻(pin)(pin)(pin)(pin)功率的(de)(de)大(da)(da)小(xiao)。分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)術的(de)(de)功率一(yi)(yi)般是50dB在(zai)50dB左右時(shi)，其抗(kang)(kang)干擾(rao)(rao)能力(li)強。但(dan)由于分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)的(de)(de)干擾(rao)(rao)與(yu)噪聲(主要是周(zhou)邊(bian)噪聲)具有很強的(de)(de)互(hu)通性，當分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)發射(she)(she)的(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)超(chao)過50dB時(shi)，其抗(kang)(kang)千擾(rao)(rao)能力(li)就會減弱。另外(wai)，在(zai)一(yi)(yi)些有噪音的(de)(de)環境中(zhong)使用(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)術，會使分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)信(xin)(xin)(xin)(xin)號(hao)(hao)無法到(dao)達發射(she)(she)端(duan)的(de)(de)接(jie)收(shou)機或者造(zao)成(cheng)發射(she)(she)端(duan)信(xin)(xin)(xin)(xin)號(hao)(hao)與(yu)接(jie)收(shou)端(duan)信(xin)(xin)(xin)(xin)號(hao)(hao)的(de)(de)糟合而(er)造(zao)成(cheng)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)或干擾(rao)(rao)(例如(ru)(ru)(ru)(ru)在(zai)使用(yong)(yong)室(shi)外(wai)電話時(shi)) 。而(er)采用(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)術的(de)(de)無線對講系統由于發射(she)(she)功率小(xiao)，分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)后的(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)強度(du)(du)比(bi)有線對講系統高很多(在(zai)實(shi)際(ji)使用(yong)(yong)中(zhong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)設備(bei)一(yi)(yi)般可以將系統信(xin)(xin)(xin)(xin)號(hao)(hao)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)到(dao)50dB以上),信(xin)(xin)(xin)(xin)號(hao)(hao)不受(shou)干擾(rao)(rao)。如(ru)(ru)(ru)(ru)果采用(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)術，需要在(zai)較大(da)(da)的(de)(de)回波功率下才能實(shi)現信(xin)(xin)(xin)(xin)號(hao)(hao)的(de)(de)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)工作(zuo)(如(ru)(ru)(ru)(ru)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)器發射(she)(she)信(xin)(xin)(xin)(xin)號(hao)(hao)與(yu)接(jie)收(shou)信(xin)(xin)(xin)(xin)號(hao)(hao)重(zhong)疊時(shi)產生的(de)(de)千擾(rao)(rao))和(he)發送信(xin)(xin)(xin)(xin)號(hao)(hao)強度(du)(du)降(jiang)低(同頻(pin)(pin)(pin)(pin)帶內(nei)的(de)(de)兩只天(tian)線對同一(yi)(yi)信(xin)(xin)(xin)(xin)道傳輸的(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)強度(du)(du)基本(ben)一(yi)(yi)致);如(ru)(ru)(ru)(ru)果采用(yong)(yong)混(hun)響(xiang)技(ji)術，則可以實(shi)現對無線信(xin)(xin)(xin)(xin)號(hao)(hao)干擾(rao)(rao)的(de)(de)抑制或降(jiang)低。