由(you)于(yu)(yu)在(zai)(zai)(zai)戶外、室內等區域，無線(xian)對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)統的信號強度較弱，而且(qie)采用(yong)(yong)(yong)(yong)頻率調制技術（如(ru)(ru) MHZ、 NMR、 BSI等）產生(sheng)的信號傳輸時(shi)(shi)(shi)(shi)延大，傳輸距離(li)遠。因此(ci)有線(xian)對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)統不適合(he)在(zai)(zai)(zai)戶外環境(jing)使(shi)(shi)用(yong)(yong)(yong)(yong)，特(te)別是(shi)在(zai)(zai)(zai)冬天(tian)及低風速(su)季節使(shi)(shi)用(yong)(yong)(yong)(yong)。雖然無線(xian)對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)統也有著不錯(cuo)的效(xiao)果。但(dan)由(you)于(yu)(yu)系(xi)統工(gong)作時(shi)(shi)(shi)(shi)會有一(yi)定的干擾，使(shi)(shi)對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)效(xiao)果下(xia)降(jiang)，另外在(zai)(zai)(zai)信號較弱時(shi)(shi)(shi)(shi)對(dui)(dui)(dui)(dui)(dui)用(yong)(yong)(yong)(yong)戶語(yu)音產生(sheng)了影響。特(te)別是(shi)在(zai)(zai)(zai)人員復(fu)雜(za)、通(tong)信距離(li)較短或需要較長時(shi)(shi)(shi)(shi)間使(shi)(shi)用(yong)(yong)(yong)(yong)時(shi)(shi)(shi)(shi)。因此(ci)，更(geng)需要有一(yi)個可(ke)(ke)靠的無線(xian)對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)統提供與(yu)有線(xian)對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)統一(yi)樣的語(yu)音信息與(yu)控制。無線(xian)對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)統具有很高的靈(ling)活性(xing)，它能夠滿足現場中所有環境(jing)使(shi)(shi)用(yong)(yong)(yong)(yong)需求并能隨時(shi)(shi)(shi)(shi)切換（如(ru)(ru)在(zai)(zai)(zai)野外、戶外電話等),用(yong)(yong)(yong)(yong)戶可(ke)(ke)以在(zai)(zai)(zai)任何(he)地點使(shi)(shi)用(yong)(yong)(yong)(yong)、隨時(shi)(shi)(shi)(shi)、隨地進行通(tong)訊。使(shi)(shi)用(yong)(yong)(yong)(yong)方便、節省成(cheng)本(ben)、節約費(fei)用(yong)(yong)(yong)(yong)。下(xia)面(mian)我們來了解一(yi)下(xia)無線(xian)對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)統它主要是(shi)什(shen)么優點？

1.性(xing)能穩定，可靠性(xing)高

在相(xiang)同無線(xian)(xian)(xian)(xian)傳(chuan)輸(shu)距離下，無線(xian)(xian)(xian)(xian)傳(chuan)輸(shu)信號更(geng)穩(wen)(wen)定由于使(shi)用(yong)了(le)功(gong)率放大器來對(dui)無線(xian)(xian)(xian)(xian)信號進行壓縮和放大，使(shi)無線(xian)(xian)(xian)(xian)信號更(geng)加穩(wen)(wen)定可(ke)靠(kao)。無線(xian)(xian)(xian)(xian)信號在弱(ruo)電磁環境下也能(neng)(neng)保(bao)(bao)持較(jiao)(jiao)好的性(xing)能(neng)(neng)。無線(xian)(xian)(xian)(xian)對(dui)講系(xi)統具有(you)發(fa)射(she)功(gong)率小、抗(kang)千擾(rao)(rao)(rao)能(neng)(neng)力強(qiang)(與有(you)線(xian)(xian)(xian)(xian)對(dui)講系(xi)統比較(jiao)(jiao))和抗(kang)電磁干擾(rao)(rao)(rao)能(neng)(neng)力強(qiang)(與有(you)線(xian)(xian)(xian)(xian)對(dui)講系(xi)統比較(jiao)(jiao))的特點。無線(xian)(xian)(xian)(xian)對(dui)講系(xi)統發(fa)射(she)信號在發(fa)射(she)前和發(fa)射(she)后(hou)均能(neng)(neng)保(bao)(bao)持良(liang)好的性(xing)能(neng)(neng)，使(shi)用(yong)過(guo)程中，發(fa)射(she)信號與接收信號完全不受任(ren)何千擾(rao)(rao)(rao)，可(ke)保(bao)(bao)持很(hen)好的穩(wen)(wen)定性(xing)，具有(you)良(liang)好的抗(kang)千擾(rao)(rao)(rao)性(xing)和抗(kang)低頻干擾(rao)(rao)(rao)能(neng)(neng)力，即使(shi)在惡劣的環境下也能(neng)(neng)保(bao)(bao)持較(jiao)(jiao)好的性(xing)能(neng)(neng)。因(yin)此無線(xian)(xian)(xian)(xian)系(xi)統有(you)較(jiao)(jiao)高的可(ke)靠(kao)性(xing)。

2.功耗小、不受天氣(qi)、濕(shi)度(du)的影響

無(wu)線(xian)(xian)對(dui)講系(xi)(xi)統在不同(tong)的(de)(de)環(huan)境中(zhong)，無(wu)線(xian)(xian)通(tong)信設(she)備(bei)和有線(xian)(xian)通(tong)信設(she)備(bei)一(yi)(yi)(yi)樣都(dou)要(yao)進行電(dian)(dian)能的(de)(de)消耗(hao)。當(dang)環(huan)境溫(wen)度在-40°C以(yi)下時，無(wu)線(xian)(xian)通(tong)信設(she)備(bei)需要(yao)每天(tian)工(gong)作(zuo)8小(xiao)時左右;當(dang)環(huan)境溫(wen)度為-20°C時，每天(tian)工(gong)作(zuo)8小(xiao)時左右;當(dang)環(huan)境溫(wen)度為-30°C時，每天(tian)工(gong)作(zuo)4小(xiao)時左右。目前市(shi)場(chang)上常見(jian)的(de)(de)無(wu)線(xian)(xian)對(dui)講系(xi)(xi)統有兩(liang)種電(dian)(dian)源(yuan)輸入(ru)方式(shi)，一(yi)(yi)(yi)種是電(dian)(dian)源(yuan)輸入(ru)，另一(yi)(yi)(yi)種是電(dian)(dian)源(yuan)輸出。從(cong)這兩(liang)種方式(shi)對(dui)系(xi)(xi)統的(de)(de)功(gong)耗(hao)來看，電(dian)(dian)源(yuan)輸入(ru)方式(shi)的(de)(de)功(gong)耗(hao)更(geng)大一(yi)(yi)(yi)些，但是功(gong)耗(hao)很小(xiao)。并(bing)且設(she)備(bei)的(de)(de)工(gong)作(zuo)環(huan)境不同(tong)，對(dui)電(dian)(dian)池的(de)(de)需求量也(ye)不同(tong)，所以(yi)功(gong)耗(hao)也(ye)不同(tong)。

3信號不受干擾

在一(yi)(yi)些有(you)干(gan)擾(rao)(rao)的(de)(de)(de)地方(fang)(fang)，例如(ru)(ru)(ru)野外、機場、工廠等，一(yi)(yi)般(ban)采(cai)用(yong)(yong)(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)方(fang)(fang)式。分(fen)(fen)頻(pin)(pin)(pin)方(fang)(fang)式的(de)(de)(de)抗干(gan)擾(rao)(rao)能(neng)力(li)(li)不強(qiang)(qiang)，其(qi)抗干(gan)擾(rao)(rao)能(neng)力(li)(li)主要取決于射(she)頻(pin)(pin)(pin)功(gong)率(lv)(lv)的(de)(de)(de)大小。分(fen)(fen)頻(pin)(pin)(pin)技術(shu)(shu)(shu)的(de)(de)(de)功(gong)率(lv)(lv)一(yi)(yi)般(ban)是50dB在50dB左右時(shi)，其(qi)抗干(gan)擾(rao)(rao)能(neng)力(li)(li)強(qiang)(qiang)。但由于分(fen)(fen)頻(pin)(pin)(pin)的(de)(de)(de)干(gan)擾(rao)(rao)與(yu)噪聲(sheng)(主要是周邊噪聲(sheng))具(ju)有(you)很強(qiang)(qiang)的(de)(de)(de)互(hu)通性，當分(fen)(fen)頻(pin)(pin)(pin)發射(she)的(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)超過50dB時(shi)，其(qi)抗千(qian)擾(rao)(rao)能(neng)力(li)(li)就(jiu)會減弱(ruo)。另外，在一(yi)(yi)些有(you)噪音的(de)(de)(de)環境中使(shi)用(yong)(yong)(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)技術(shu)(shu)(shu)，會使(shi)分(fen)(fen)頻(pin)(pin)(pin)信(xin)(xin)(xin)號(hao)(hao)(hao)無法到達發射(she)端的(de)(de)(de)接(jie)收機或(huo)者造(zao)成(cheng)(cheng)發射(she)端信(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接(jie)收端信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)糟合(he)而造(zao)成(cheng)(cheng)分(fen)(fen)頻(pin)(pin)(pin)或(huo)干(gan)擾(rao)(rao)(例如(ru)(ru)(ru)在使(shi)用(yong)(yong)(yong)(yong)室外電話時(shi)) 。而采(cai)用(yong)(yong)(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)技術(shu)(shu)(shu)的(de)(de)(de)無線對(dui)講(jiang)系統(tong)由于發射(she)功(gong)率(lv)(lv)小，分(fen)(fen)頻(pin)(pin)(pin)后的(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)度比(bi)有(you)線對(dui)講(jiang)系統(tong)高很多(在實際使(shi)用(yong)(yong)(yong)(yong)中分(fen)(fen)頻(pin)(pin)(pin)設備一(yi)(yi)般(ban)可以將系統(tong)信(xin)(xin)(xin)號(hao)(hao)(hao)分(fen)(fen)頻(pin)(pin)(pin)到50dB以上),信(xin)(xin)(xin)號(hao)(hao)(hao)不受干(gan)擾(rao)(rao)。如(ru)(ru)(ru)果采(cai)用(yong)(yong)(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)技術(shu)(shu)(shu)，需(xu)要在較大的(de)(de)(de)回波功(gong)率(lv)(lv)下才能(neng)實現(xian)信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)分(fen)(fen)頻(pin)(pin)(pin)工作(如(ru)(ru)(ru)分(fen)(fen)頻(pin)(pin)(pin)器發射(she)信(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接(jie)收信(xin)(xin)(xin)號(hao)(hao)(hao)重疊時(shi)產生(sheng)的(de)(de)(de)千(qian)擾(rao)(rao))和發送(song)信(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)度降(jiang)低(同(tong)頻(pin)(pin)(pin)帶內(nei)的(de)(de)(de)兩只天線對(dui)同(tong)一(yi)(yi)信(xin)(xin)(xin)道傳輸(shu)的(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)度基(ji)本(ben)一(yi)(yi)致);如(ru)(ru)(ru)果采(cai)用(yong)(yong)(yong)(yong)混響技術(shu)(shu)(shu)，則可以實現(xian)對(dui)無線信(xin)(xin)(xin)號(hao)(hao)(hao)干(gan)擾(rao)(rao)的(de)(de)(de)抑制或(huo)降(jiang)低。