由于在戶(hu)外(wai)、室內等區域(yu)，無(wu)線(xian)對(dui)講系(xi)(xi)統(tong)(tong)的信(xin)(xin)(xin)號強度較弱，而且采用(yong)(yong)頻率調制技術（如 MHZ、 NMR、 BSI等）產(chan)生的信(xin)(xin)(xin)號傳(chuan)輸時延(yan)大，傳(chuan)輸距離遠。因此有線(xian)對(dui)講系(xi)(xi)統(tong)(tong)不適合在戶(hu)外(wai)環境(jing)使(shi)用(yong)(yong)，特(te)別(bie)是(shi)在冬天及低風速季節(jie)使(shi)用(yong)(yong)。雖然無(wu)線(xian)對(dui)講系(xi)(xi)統(tong)(tong)也(ye)有著不錯(cuo)的效果。但(dan)由于系(xi)(xi)統(tong)(tong)工作時會有一(yi)定(ding)的干擾，使(shi)對(dui)講效果下降，另外(wai)在信(xin)(xin)(xin)號較弱時對(dui)用(yong)(yong)戶(hu)語(yu)音(yin)產(chan)生了(le)影響(xiang)。特(te)別(bie)是(shi)在人(ren)員復雜、通(tong)信(xin)(xin)(xin)距離較短或需要(yao)較長時間使(shi)用(yong)(yong)時。因此，更(geng)需要(yao)有一(yi)個(ge)可(ke)靠的無(wu)線(xian)對(dui)講系(xi)(xi)統(tong)(tong)提供與有線(xian)對(dui)講系(xi)(xi)統(tong)(tong)一(yi)樣的語(yu)音(yin)信(xin)(xin)(xin)息與控制。無(wu)線(xian)對(dui)講系(xi)(xi)統(tong)(tong)具有很高的靈(ling)活性，它(ta)能夠滿足現場(chang)中所(suo)有環境(jing)使(shi)用(yong)(yong)需求(qiu)并能隨時切換（如在野外(wai)、戶(hu)外(wai)電(dian)話等),用(yong)(yong)戶(hu)可(ke)以在任何(he)地點使(shi)用(yong)(yong)、隨時、隨地進行通(tong)訊。使(shi)用(yong)(yong)方(fang)便、節(jie)省成本(ben)、節(jie)約費用(yong)(yong)。下面我們(men)來了(le)解一(yi)下無(wu)線(xian)對(dui)講系(xi)(xi)統(tong)(tong)它(ta)主要(yao)是(shi)什么優點？

1.性能穩定，可靠(kao)性高

在相同無線(xian)(xian)傳(chuan)輸距(ju)離下(xia)(xia)，無線(xian)(xian)傳(chuan)輸信(xin)(xin)(xin)號(hao)(hao)(hao)更穩定由于使用了功(gong)率放大器來(lai)對無線(xian)(xian)信(xin)(xin)(xin)號(hao)(hao)(hao)進行壓縮(suo)和放大，使無線(xian)(xian)信(xin)(xin)(xin)號(hao)(hao)(hao)更加穩定可靠(kao)。無線(xian)(xian)信(xin)(xin)(xin)號(hao)(hao)(hao)在弱電磁(ci)環境下(xia)(xia)也(ye)能(neng)(neng)保(bao)持較(jiao)好的性(xing)能(neng)(neng)。無線(xian)(xian)對講系(xi)(xi)統(tong)(tong)具有(you)發(fa)射(she)(she)功(gong)率小、抗(kang)千擾能(neng)(neng)力(li)強(與(yu)有(you)線(xian)(xian)對講系(xi)(xi)統(tong)(tong)比較(jiao))和抗(kang)電磁(ci)干擾能(neng)(neng)力(li)強(與(yu)有(you)線(xian)(xian)對講系(xi)(xi)統(tong)(tong)比較(jiao))的特點(dian)。無線(xian)(xian)對講系(xi)(xi)統(tong)(tong)發(fa)射(she)(she)信(xin)(xin)(xin)號(hao)(hao)(hao)在發(fa)射(she)(she)前和發(fa)射(she)(she)后(hou)均能(neng)(neng)保(bao)持良(liang)好的性(xing)能(neng)(neng)，使用過程中，發(fa)射(she)(she)信(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接收信(xin)(xin)(xin)號(hao)(hao)(hao)完全(quan)不受任何千擾，可保(bao)持很好的穩定性(xing)，具有(you)良(liang)好的抗(kang)千擾性(xing)和抗(kang)低頻干擾能(neng)(neng)力(li)，即使在惡劣的環境下(xia)(xia)也(ye)能(neng)(neng)保(bao)持較(jiao)好的性(xing)能(neng)(neng)。因此無線(xian)(xian)系(xi)(xi)統(tong)(tong)有(you)較(jiao)高的可靠(kao)性(xing)。

2.功耗小、不受天氣、濕度(du)的影響(xiang)

無線對講系統(tong)在(zai)不(bu)(bu)同(tong)的(de)環境(jing)中，無線通信(xin)設(she)備和有線通信(xin)設(she)備一(yi)樣都要進(jin)行電(dian)(dian)(dian)能的(de)消耗。當(dang)(dang)(dang)環境(jing)溫度(du)在(zai)-40°C以下時(shi)(shi)，無線通信(xin)設(she)備需要每(mei)天工(gong)(gong)作8小時(shi)(shi)左右(you);當(dang)(dang)(dang)環境(jing)溫度(du)為-20°C時(shi)(shi)，每(mei)天工(gong)(gong)作8小時(shi)(shi)左右(you);當(dang)(dang)(dang)環境(jing)溫度(du)為-30°C時(shi)(shi)，每(mei)天工(gong)(gong)作4小時(shi)(shi)左右(you)。目(mu)前市場上常見的(de)無線對講系統(tong)有兩種電(dian)(dian)(dian)源(yuan)輸(shu)(shu)入方式(shi)(shi)，一(yi)種是(shi)(shi)電(dian)(dian)(dian)源(yuan)輸(shu)(shu)入，另一(yi)種是(shi)(shi)電(dian)(dian)(dian)源(yuan)輸(shu)(shu)出。從(cong)這兩種方式(shi)(shi)對系統(tong)的(de)功(gong)耗來看，電(dian)(dian)(dian)源(yuan)輸(shu)(shu)入方式(shi)(shi)的(de)功(gong)耗更大(da)一(yi)些，但是(shi)(shi)功(gong)耗很小。并(bing)且(qie)設(she)備的(de)工(gong)(gong)作環境(jing)不(bu)(bu)同(tong)，對電(dian)(dian)(dian)池的(de)需求量也不(bu)(bu)同(tong)，所以功(gong)耗也不(bu)(bu)同(tong)。

3信號不受干擾

在(zai)一(yi)(yi)些有(you)干擾(rao)的(de)(de)(de)(de)地方(fang)，例(li)如(ru)(ru)野外、機場、工(gong)廠(chang)等，一(yi)(yi)般(ban)采用(yong)(yong)(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)方(fang)式。分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)方(fang)式的(de)(de)(de)(de)抗(kang)(kang)(kang)干擾(rao)能(neng)力不(bu)強，其(qi)(qi)抗(kang)(kang)(kang)干擾(rao)能(neng)力主(zhu)要取決于(yu)射(she)(she)頻(pin)(pin)(pin)(pin)功率(lv)(lv)的(de)(de)(de)(de)大小。分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)(de)功率(lv)(lv)一(yi)(yi)般(ban)是(shi)50dB在(zai)50dB左右時，其(qi)(qi)抗(kang)(kang)(kang)干擾(rao)能(neng)力強。但由于(yu)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)的(de)(de)(de)(de)干擾(rao)與噪(zao)聲(主(zhu)要是(shi)周(zhou)邊(bian)噪(zao)聲)具有(you)很(hen)(hen)強的(de)(de)(de)(de)互(hu)通性(xing)，當(dang)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)發(fa)射(she)(she)的(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)超(chao)過50dB時，其(qi)(qi)抗(kang)(kang)(kang)千擾(rao)能(neng)力就(jiu)會(hui)減弱。另外，在(zai)一(yi)(yi)些有(you)噪(zao)音的(de)(de)(de)(de)環境(jing)中使用(yong)(yong)(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)術(shu)，會(hui)使分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)無法到(dao)達發(fa)射(she)(she)端(duan)的(de)(de)(de)(de)接(jie)收(shou)機或者造成(cheng)發(fa)射(she)(she)端(duan)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)與接(jie)收(shou)端(duan)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)的(de)(de)(de)(de)糟合而造成(cheng)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)或干擾(rao)(例(li)如(ru)(ru)在(zai)使用(yong)(yong)(yong)(yong)室外電話時) 。而采用(yong)(yong)(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)(de)無線(xian)對(dui)講系(xi)統(tong)由于(yu)發(fa)射(she)(she)功率(lv)(lv)小，分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)后的(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)強度(du)比有(you)線(xian)對(dui)講系(xi)統(tong)高很(hen)(hen)多(在(zai)實(shi)(shi)際使用(yong)(yong)(yong)(yong)中分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)設備一(yi)(yi)般(ban)可(ke)以(yi)將(jiang)系(xi)統(tong)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)到(dao)50dB以(yi)上(shang)),信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)不(bu)受干擾(rao)。如(ru)(ru)果采用(yong)(yong)(yong)(yong)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)術(shu)，需(xu)要在(zai)較大的(de)(de)(de)(de)回波(bo)功率(lv)(lv)下才能(neng)實(shi)(shi)現(xian)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)的(de)(de)(de)(de)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)工(gong)作(如(ru)(ru)分(fen)(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)器(qi)發(fa)射(she)(she)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)與接(jie)收(shou)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)重疊(die)時產生的(de)(de)(de)(de)千擾(rao))和(he)發(fa)送信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)強度(du)降(jiang)低(di)(同頻(pin)(pin)(pin)(pin)帶內的(de)(de)(de)(de)兩(liang)只天線(xian)對(dui)同一(yi)(yi)信(xin)(xin)(xin)(xin)道傳輸(shu)的(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)強度(du)基本一(yi)(yi)致);如(ru)(ru)果采用(yong)(yong)(yong)(yong)混響技(ji)術(shu)，則(ze)可(ke)以(yi)實(shi)(shi)現(xian)對(dui)無線(xian)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)干擾(rao)的(de)(de)(de)(de)抑制或降(jiang)低(di)。