由(you)于(yu)在(zai)(zai)(zai)(zai)戶(hu)外(wai)(wai)、室內等(deng)區域，無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)的(de)(de)(de)信(xin)(xin)號強度較(jiao)弱，而且采用(yong)(yong)(yong)頻率調制技術（如(ru) MHZ、 NMR、 BSI等(deng)）產生(sheng)的(de)(de)(de)信(xin)(xin)號傳輸時(shi)(shi)延大，傳輸距離(li)遠(yuan)。因(yin)此有(you)(you)線(xian)(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)不適(shi)合在(zai)(zai)(zai)(zai)戶(hu)外(wai)(wai)環境使(shi)(shi)用(yong)(yong)(yong)，特別(bie)是(shi)在(zai)(zai)(zai)(zai)冬天(tian)及低風速(su)季節使(shi)(shi)用(yong)(yong)(yong)。雖然(ran)無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)也有(you)(you)著(zhu)不錯的(de)(de)(de)效果。但由(you)于(yu)系(xi)統(tong)(tong)工作時(shi)(shi)會有(you)(you)一定的(de)(de)(de)干(gan)擾，使(shi)(shi)對(dui)(dui)(dui)(dui)講(jiang)(jiang)效果下(xia)降，另外(wai)(wai)在(zai)(zai)(zai)(zai)信(xin)(xin)號較(jiao)弱時(shi)(shi)對(dui)(dui)(dui)(dui)用(yong)(yong)(yong)戶(hu)語(yu)音產生(sheng)了影(ying)響。特別(bie)是(shi)在(zai)(zai)(zai)(zai)人(ren)員(yuan)復(fu)雜、通(tong)信(xin)(xin)距離(li)較(jiao)短或需要較(jiao)長時(shi)(shi)間(jian)使(shi)(shi)用(yong)(yong)(yong)時(shi)(shi)。因(yin)此，更需要有(you)(you)一個可靠的(de)(de)(de)無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)提供與有(you)(you)線(xian)(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)一樣(yang)的(de)(de)(de)語(yu)音信(xin)(xin)息(xi)與控制。無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)具有(you)(you)很(hen)高的(de)(de)(de)靈(ling)活性，它能(neng)夠滿足現(xian)場中所有(you)(you)環境使(shi)(shi)用(yong)(yong)(yong)需求并能(neng)隨(sui)(sui)(sui)時(shi)(shi)切換(huan)（如(ru)在(zai)(zai)(zai)(zai)野外(wai)(wai)、戶(hu)外(wai)(wai)電(dian)話等(deng)),用(yong)(yong)(yong)戶(hu)可以(yi)在(zai)(zai)(zai)(zai)任何地點使(shi)(shi)用(yong)(yong)(yong)、隨(sui)(sui)(sui)時(shi)(shi)、隨(sui)(sui)(sui)地進行通(tong)訊。使(shi)(shi)用(yong)(yong)(yong)方便、節省成本、節約費(fei)用(yong)(yong)(yong)。下(xia)面(mian)我們來(lai)了解一下(xia)無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)它主要是(shi)什么優點？

1.性(xing)能穩定，可靠性(xing)高

在(zai)相同無(wu)(wu)線(xian)傳(chuan)輸距離下(xia)，無(wu)(wu)線(xian)傳(chuan)輸信號(hao)更穩(wen)定由于使(shi)(shi)用了功率放(fang)大器來對無(wu)(wu)線(xian)信號(hao)進(jin)行壓縮和(he)放(fang)大，使(shi)(shi)無(wu)(wu)線(xian)信號(hao)更加穩(wen)定可(ke)靠(kao)。無(wu)(wu)線(xian)信號(hao)在(zai)弱電磁(ci)環境下(xia)也(ye)能(neng)(neng)(neng)保(bao)(bao)(bao)持較(jiao)(jiao)好(hao)的(de)性(xing)能(neng)(neng)(neng)。無(wu)(wu)線(xian)對講系(xi)統具(ju)有(you)發射(she)(she)功率小、抗千(qian)擾(rao)(rao)(rao)能(neng)(neng)(neng)力強(與(yu)有(you)線(xian)對講系(xi)統比較(jiao)(jiao))和(he)抗電磁(ci)干擾(rao)(rao)(rao)能(neng)(neng)(neng)力強(與(yu)有(you)線(xian)對講系(xi)統比較(jiao)(jiao))的(de)特點。無(wu)(wu)線(xian)對講系(xi)統發射(she)(she)信號(hao)在(zai)發射(she)(she)前和(he)發射(she)(she)后均能(neng)(neng)(neng)保(bao)(bao)(bao)持良好(hao)的(de)性(xing)能(neng)(neng)(neng)，使(shi)(shi)用過程(cheng)中，發射(she)(she)信號(hao)與(yu)接(jie)收信號(hao)完全不受任(ren)何(he)千(qian)擾(rao)(rao)(rao)，可(ke)保(bao)(bao)(bao)持很好(hao)的(de)穩(wen)定性(xing)，具(ju)有(you)良好(hao)的(de)抗千(qian)擾(rao)(rao)(rao)性(xing)和(he)抗低(di)頻干擾(rao)(rao)(rao)能(neng)(neng)(neng)力，即(ji)使(shi)(shi)在(zai)惡劣的(de)環境下(xia)也(ye)能(neng)(neng)(neng)保(bao)(bao)(bao)持較(jiao)(jiao)好(hao)的(de)性(xing)能(neng)(neng)(neng)。因(yin)此無(wu)(wu)線(xian)系(xi)統有(you)較(jiao)(jiao)高(gao)的(de)可(ke)靠(kao)性(xing)。

2.功耗小、不受天氣、濕度(du)的(de)影響

無(wu)(wu)線對(dui)講系統(tong)(tong)在不同的(de)(de)環(huan)境(jing)中，無(wu)(wu)線通信(xin)設(she)(she)備(bei)和(he)有(you)線通信(xin)設(she)(she)備(bei)一樣都要進(jin)行電能的(de)(de)消耗(hao)。當(dang)環(huan)境(jing)溫(wen)度在-40°C以下時(shi)(shi)(shi)，無(wu)(wu)線通信(xin)設(she)(she)備(bei)需要每天(tian)(tian)工(gong)作(zuo)(zuo)8小時(shi)(shi)(shi)左(zuo)(zuo)(zuo)右(you);當(dang)環(huan)境(jing)溫(wen)度為-20°C時(shi)(shi)(shi)，每天(tian)(tian)工(gong)作(zuo)(zuo)8小時(shi)(shi)(shi)左(zuo)(zuo)(zuo)右(you);當(dang)環(huan)境(jing)溫(wen)度為-30°C時(shi)(shi)(shi)，每天(tian)(tian)工(gong)作(zuo)(zuo)4小時(shi)(shi)(shi)左(zuo)(zuo)(zuo)右(you)。目前市場(chang)上常見的(de)(de)無(wu)(wu)線對(dui)講系統(tong)(tong)有(you)兩種(zhong)電源輸(shu)(shu)(shu)入方(fang)式，一種(zhong)是電源輸(shu)(shu)(shu)入，另一種(zhong)是電源輸(shu)(shu)(shu)出。從(cong)這兩種(zhong)方(fang)式對(dui)系統(tong)(tong)的(de)(de)功(gong)耗(hao)來(lai)看(kan)，電源輸(shu)(shu)(shu)入方(fang)式的(de)(de)功(gong)耗(hao)更(geng)大(da)一些(xie)，但是功(gong)耗(hao)很小。并且設(she)(she)備(bei)的(de)(de)工(gong)作(zuo)(zuo)環(huan)境(jing)不同，對(dui)電池的(de)(de)需求量也不同，所(suo)以功(gong)耗(hao)也不同。

3信號不受干擾

在(zai)一些有(you)(you)干擾(rao)的(de)(de)(de)地方，例如(ru)野外(wai)、機(ji)場、工廠等，一般采(cai)用(yong)(yong)(yong)分頻(pin)(pin)(pin)方式。分頻(pin)(pin)(pin)方式的(de)(de)(de)抗(kang)(kang)干擾(rao)能(neng)(neng)(neng)力(li)不強(qiang)(qiang)(qiang)，其抗(kang)(kang)干擾(rao)能(neng)(neng)(neng)力(li)主要(yao)(yao)取決(jue)于射(she)(she)(she)頻(pin)(pin)(pin)功率(lv)(lv)的(de)(de)(de)大小(xiao)。分頻(pin)(pin)(pin)技術(shu)(shu)的(de)(de)(de)功率(lv)(lv)一般是50dB在(zai)50dB左右時，其抗(kang)(kang)干擾(rao)能(neng)(neng)(neng)力(li)強(qiang)(qiang)(qiang)。但(dan)由于分頻(pin)(pin)(pin)的(de)(de)(de)干擾(rao)與(yu)噪(zao)聲(主要(yao)(yao)是周邊(bian)噪(zao)聲)具有(you)(you)很強(qiang)(qiang)(qiang)的(de)(de)(de)互通性(xing)，當分頻(pin)(pin)(pin)發(fa)(fa)(fa)射(she)(she)(she)的(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)超過50dB時，其抗(kang)(kang)千擾(rao)能(neng)(neng)(neng)力(li)就會減弱。另(ling)外(wai)，在(zai)一些有(you)(you)噪(zao)音的(de)(de)(de)環境中使(shi)用(yong)(yong)(yong)分頻(pin)(pin)(pin)技術(shu)(shu)，會使(shi)分頻(pin)(pin)(pin)信(xin)(xin)(xin)號(hao)(hao)(hao)無法(fa)到(dao)達發(fa)(fa)(fa)射(she)(she)(she)端(duan)(duan)的(de)(de)(de)接收機(ji)或(huo)者造(zao)成發(fa)(fa)(fa)射(she)(she)(she)端(duan)(duan)信(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接收端(duan)(duan)信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)糟合而(er)造(zao)成分頻(pin)(pin)(pin)或(huo)干擾(rao)(例如(ru)在(zai)使(shi)用(yong)(yong)(yong)室外(wai)電(dian)話時) 。而(er)采(cai)用(yong)(yong)(yong)分頻(pin)(pin)(pin)技術(shu)(shu)的(de)(de)(de)無線(xian)對(dui)(dui)(dui)講(jiang)系(xi)統由于發(fa)(fa)(fa)射(she)(she)(she)功率(lv)(lv)小(xiao)，分頻(pin)(pin)(pin)后的(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)(qiang)度(du)比有(you)(you)線(xian)對(dui)(dui)(dui)講(jiang)系(xi)統高很多(在(zai)實際(ji)使(shi)用(yong)(yong)(yong)中分頻(pin)(pin)(pin)設備(bei)一般可以(yi)將系(xi)統信(xin)(xin)(xin)號(hao)(hao)(hao)分頻(pin)(pin)(pin)到(dao)50dB以(yi)上),信(xin)(xin)(xin)號(hao)(hao)(hao)不受干擾(rao)。如(ru)果(guo)采(cai)用(yong)(yong)(yong)分頻(pin)(pin)(pin)技術(shu)(shu)，需要(yao)(yao)在(zai)較大的(de)(de)(de)回波功率(lv)(lv)下(xia)才能(neng)(neng)(neng)實現信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)分頻(pin)(pin)(pin)工作(如(ru)分頻(pin)(pin)(pin)器發(fa)(fa)(fa)射(she)(she)(she)信(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接收信(xin)(xin)(xin)號(hao)(hao)(hao)重疊時產生的(de)(de)(de)千擾(rao))和發(fa)(fa)(fa)送(song)信(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)(qiang)度(du)降(jiang)低(同頻(pin)(pin)(pin)帶(dai)內(nei)的(de)(de)(de)兩(liang)只天線(xian)對(dui)(dui)(dui)同一信(xin)(xin)(xin)道(dao)傳輸(shu)的(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)(qiang)度(du)基(ji)本一致);如(ru)果(guo)采(cai)用(yong)(yong)(yong)混(hun)響技術(shu)(shu)，則可以(yi)實現對(dui)(dui)(dui)無線(xian)信(xin)(xin)(xin)號(hao)(hao)(hao)干擾(rao)的(de)(de)(de)抑制或(huo)降(jiang)低。