由(you)(you)于在(zai)戶(hu)外、室內等(deng)區域，無(wu)(wu)線對(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)(tong)(tong)的信號(hao)(hao)強(qiang)度較(jiao)弱(ruo)(ruo)，而且采用(yong)(yong)頻(pin)率(lv)調制技術（如 MHZ、 NMR、 BSI等(deng)）產(chan)生(sheng)的信號(hao)(hao)傳(chuan)輸時延(yan)大，傳(chuan)輸距(ju)(ju)離遠(yuan)。因(yin)此有(you)(you)線對(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)(tong)(tong)不適(shi)合(he)在(zai)戶(hu)外環境使(shi)(shi)用(yong)(yong)，特別(bie)是在(zai)冬天及(ji)低風速季(ji)節使(shi)(shi)用(yong)(yong)。雖然無(wu)(wu)線對(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)(tong)(tong)也有(you)(you)著不錯的效(xiao)(xiao)果。但由(you)(you)于系(xi)(xi)統(tong)(tong)(tong)(tong)工(gong)作時會有(you)(you)一(yi)定(ding)的干擾，使(shi)(shi)對(dui)(dui)講(jiang)(jiang)效(xiao)(xiao)果下降，另(ling)外在(zai)信號(hao)(hao)較(jiao)弱(ruo)(ruo)時對(dui)(dui)用(yong)(yong)戶(hu)語音(yin)產(chan)生(sheng)了影響。特別(bie)是在(zai)人員復雜(za)、通(tong)信距(ju)(ju)離較(jiao)短或需(xu)要(yao)較(jiao)長時間使(shi)(shi)用(yong)(yong)時。因(yin)此，更需(xu)要(yao)有(you)(you)一(yi)個(ge)可靠的無(wu)(wu)線對(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)(tong)(tong)提供與(yu)有(you)(you)線對(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)(tong)(tong)一(yi)樣的語音(yin)信息與(yu)控制。無(wu)(wu)線對(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)(tong)(tong)具(ju)有(you)(you)很高的靈活(huo)性(xing)，它能夠滿足現場中所有(you)(you)環境使(shi)(shi)用(yong)(yong)需(xu)求(qiu)并能隨時切(qie)換（如在(zai)野外、戶(hu)外電話等(deng)),用(yong)(yong)戶(hu)可以(yi)在(zai)任何(he)地點使(shi)(shi)用(yong)(yong)、隨時、隨地進(jin)行通(tong)訊。使(shi)(shi)用(yong)(yong)方便、節省成本、節約費(fei)用(yong)(yong)。下面我們來了解一(yi)下無(wu)(wu)線對(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)(tong)(tong)它主要(yao)是什么(me)優點？

1.性能穩定，可靠性高

在(zai)相同無(wu)線傳輸距離下(xia)，無(wu)線傳輸信(xin)(xin)(xin)號(hao)更(geng)穩(wen)定(ding)由(you)于(yu)使用了功(gong)率(lv)放大器來(lai)對(dui)(dui)無(wu)線信(xin)(xin)(xin)號(hao)進行壓縮和(he)放大，使無(wu)線信(xin)(xin)(xin)號(hao)更(geng)加穩(wen)定(ding)可靠(kao)。無(wu)線信(xin)(xin)(xin)號(hao)在(zai)弱電(dian)磁(ci)環(huan)(huan)境(jing)下(xia)也能(neng)(neng)保(bao)持較(jiao)(jiao)好(hao)(hao)(hao)的(de)性(xing)能(neng)(neng)。無(wu)線對(dui)(dui)講系(xi)統(tong)(tong)具有(you)發射(she)功(gong)率(lv)小、抗千(qian)擾(rao)能(neng)(neng)力強(qiang)(與有(you)線對(dui)(dui)講系(xi)統(tong)(tong)比較(jiao)(jiao))和(he)抗電(dian)磁(ci)干擾(rao)能(neng)(neng)力強(qiang)(與有(you)線對(dui)(dui)講系(xi)統(tong)(tong)比較(jiao)(jiao))的(de)特(te)點。無(wu)線對(dui)(dui)講系(xi)統(tong)(tong)發射(she)信(xin)(xin)(xin)號(hao)在(zai)發射(she)前和(he)發射(she)后均能(neng)(neng)保(bao)持良(liang)好(hao)(hao)(hao)的(de)性(xing)能(neng)(neng)，使用過程中，發射(she)信(xin)(xin)(xin)號(hao)與接收信(xin)(xin)(xin)號(hao)完全(quan)不受(shou)任何千(qian)擾(rao)，可保(bao)持很好(hao)(hao)(hao)的(de)穩(wen)定(ding)性(xing)，具有(you)良(liang)好(hao)(hao)(hao)的(de)抗千(qian)擾(rao)性(xing)和(he)抗低(di)頻干擾(rao)能(neng)(neng)力，即(ji)使在(zai)惡劣(lie)的(de)環(huan)(huan)境(jing)下(xia)也能(neng)(neng)保(bao)持較(jiao)(jiao)好(hao)(hao)(hao)的(de)性(xing)能(neng)(neng)。因此無(wu)線系(xi)統(tong)(tong)有(you)較(jiao)(jiao)高的(de)可靠(kao)性(xing)。

2.功耗小、不受天(tian)氣(qi)、濕度的影(ying)響

無線(xian)對講(jiang)系統(tong)在不(bu)(bu)同的(de)環境(jing)中，無線(xian)通信設備(bei)(bei)和有線(xian)通信設備(bei)(bei)一樣都要(yao)進行電(dian)(dian)(dian)(dian)能的(de)消耗(hao)(hao)。當環境(jing)溫(wen)度在-40°C以下時(shi)(shi)(shi)，無線(xian)通信設備(bei)(bei)需(xu)要(yao)每天(tian)工作(zuo)(zuo)8小(xiao)時(shi)(shi)(shi)左(zuo)右;當環境(jing)溫(wen)度為-20°C時(shi)(shi)(shi)，每天(tian)工作(zuo)(zuo)8小(xiao)時(shi)(shi)(shi)左(zuo)右;當環境(jing)溫(wen)度為-30°C時(shi)(shi)(shi)，每天(tian)工作(zuo)(zuo)4小(xiao)時(shi)(shi)(shi)左(zuo)右。目前(qian)市場上(shang)常見的(de)無線(xian)對講(jiang)系統(tong)有兩(liang)種(zhong)電(dian)(dian)(dian)(dian)源(yuan)(yuan)輸入(ru)方式，一種(zhong)是(shi)電(dian)(dian)(dian)(dian)源(yuan)(yuan)輸入(ru)，另一種(zhong)是(shi)電(dian)(dian)(dian)(dian)源(yuan)(yuan)輸出。從這兩(liang)種(zhong)方式對系統(tong)的(de)功耗(hao)(hao)來看(kan)，電(dian)(dian)(dian)(dian)源(yuan)(yuan)輸入(ru)方式的(de)功耗(hao)(hao)更大一些，但(dan)是(shi)功耗(hao)(hao)很小(xiao)。并且設備(bei)(bei)的(de)工作(zuo)(zuo)環境(jing)不(bu)(bu)同，對電(dian)(dian)(dian)(dian)池(chi)的(de)需(xu)求量也不(bu)(bu)同，所以功耗(hao)(hao)也不(bu)(bu)同。

3信號不受干擾

在一(yi)(yi)(yi)些有(you)(you)干擾(rao)(rao)的(de)(de)(de)地方，例如(ru)野外、機場(chang)、工廠等，一(yi)(yi)(yi)般采用(yong)分(fen)頻(pin)(pin)(pin)方式(shi)。分(fen)頻(pin)(pin)(pin)方式(shi)的(de)(de)(de)抗(kang)干擾(rao)(rao)能(neng)力(li)不強(qiang)，其(qi)抗(kang)干擾(rao)(rao)能(neng)力(li)主要取決于射(she)(she)頻(pin)(pin)(pin)功(gong)率(lv)的(de)(de)(de)大(da)小。分(fen)頻(pin)(pin)(pin)技術(shu)(shu)的(de)(de)(de)功(gong)率(lv)一(yi)(yi)(yi)般是50dB在50dB左右時，其(qi)抗(kang)干擾(rao)(rao)能(neng)力(li)強(qiang)。但由(you)于分(fen)頻(pin)(pin)(pin)的(de)(de)(de)干擾(rao)(rao)與噪(zao)(zao)聲(主要是周邊噪(zao)(zao)聲)具有(you)(you)很(hen)強(qiang)的(de)(de)(de)互通性，當分(fen)頻(pin)(pin)(pin)發(fa)射(she)(she)的(de)(de)(de)信(xin)(xin)號超過50dB時，其(qi)抗(kang)千擾(rao)(rao)能(neng)力(li)就(jiu)會(hui)減弱。另(ling)外，在一(yi)(yi)(yi)些有(you)(you)噪(zao)(zao)音的(de)(de)(de)環(huan)境中使(shi)用(yong)分(fen)頻(pin)(pin)(pin)技術(shu)(shu)，會(hui)使(shi)分(fen)頻(pin)(pin)(pin)信(xin)(xin)號無(wu)法到達發(fa)射(she)(she)端(duan)的(de)(de)(de)接(jie)(jie)收(shou)機或(huo)者造(zao)成發(fa)射(she)(she)端(duan)信(xin)(xin)號與接(jie)(jie)收(shou)端(duan)信(xin)(xin)號的(de)(de)(de)糟合而造(zao)成分(fen)頻(pin)(pin)(pin)或(huo)干擾(rao)(rao)(例如(ru)在使(shi)用(yong)室外電話(hua)時) 。而采用(yong)分(fen)頻(pin)(pin)(pin)技術(shu)(shu)的(de)(de)(de)無(wu)線(xian)對講系(xi)統由(you)于發(fa)射(she)(she)功(gong)率(lv)小，分(fen)頻(pin)(pin)(pin)后的(de)(de)(de)信(xin)(xin)號強(qiang)度(du)比有(you)(you)線(xian)對講系(xi)統高(gao)很(hen)多(在實(shi)際使(shi)用(yong)中分(fen)頻(pin)(pin)(pin)設備一(yi)(yi)(yi)般可以(yi)將系(xi)統信(xin)(xin)號分(fen)頻(pin)(pin)(pin)到50dB以(yi)上),信(xin)(xin)號不受干擾(rao)(rao)。如(ru)果采用(yong)分(fen)頻(pin)(pin)(pin)技術(shu)(shu)，需(xu)要在較大(da)的(de)(de)(de)回波功(gong)率(lv)下(xia)才(cai)能(neng)實(shi)現信(xin)(xin)號的(de)(de)(de)分(fen)頻(pin)(pin)(pin)工作(如(ru)分(fen)頻(pin)(pin)(pin)器發(fa)射(she)(she)信(xin)(xin)號與接(jie)(jie)收(shou)信(xin)(xin)號重(zhong)疊(die)時產(chan)生的(de)(de)(de)千擾(rao)(rao))和發(fa)送信(xin)(xin)號強(qiang)度(du)降(jiang)(jiang)低(di)(同頻(pin)(pin)(pin)帶內(nei)的(de)(de)(de)兩只(zhi)天線(xian)對同一(yi)(yi)(yi)信(xin)(xin)道傳輸的(de)(de)(de)信(xin)(xin)號強(qiang)度(du)基本一(yi)(yi)(yi)致);如(ru)果采用(yong)混響技術(shu)(shu)，則可以(yi)實(shi)現對無(wu)線(xian)信(xin)(xin)號干擾(rao)(rao)的(de)(de)(de)抑(yi)制或(huo)降(jiang)(jiang)低(di)。