由于(yu)在(zai)(zai)(zai)(zai)戶外、室內等(deng)區域，無(wu)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)(xi)統(tong)(tong)的信號強度較弱(ruo)(ruo)，而且采用(yong)(yong)(yong)頻率(lv)調(diao)制技術（如(ru) MHZ、 NMR、 BSI等(deng)）產生(sheng)的信號傳(chuan)輸(shu)(shu)時(shi)(shi)延大，傳(chuan)輸(shu)(shu)距離遠(yuan)。因此有線(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)(xi)統(tong)(tong)不適合(he)在(zai)(zai)(zai)(zai)戶外環境使(shi)(shi)用(yong)(yong)(yong)，特別(bie)是在(zai)(zai)(zai)(zai)冬天及低風速季節使(shi)(shi)用(yong)(yong)(yong)。雖然無(wu)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)(xi)統(tong)(tong)也(ye)有著不錯(cuo)的效果。但由于(yu)系(xi)(xi)(xi)統(tong)(tong)工作時(shi)(shi)會有一定的干(gan)擾，使(shi)(shi)對(dui)(dui)講(jiang)效果下(xia)降，另外在(zai)(zai)(zai)(zai)信號較弱(ruo)(ruo)時(shi)(shi)對(dui)(dui)用(yong)(yong)(yong)戶語音(yin)產生(sheng)了影(ying)響(xiang)。特別(bie)是在(zai)(zai)(zai)(zai)人員(yuan)復雜、通(tong)信距離較短或需要(yao)較長時(shi)(shi)間使(shi)(shi)用(yong)(yong)(yong)時(shi)(shi)。因此，更需要(yao)有一個可靠的無(wu)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)(xi)統(tong)(tong)提供與(yu)有線(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)(xi)統(tong)(tong)一樣的語音(yin)信息與(yu)控制。無(wu)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)(xi)統(tong)(tong)具(ju)有很高的靈(ling)活性，它能夠滿足(zu)現場中(zhong)所有環境使(shi)(shi)用(yong)(yong)(yong)需求并能隨(sui)時(shi)(shi)切換（如(ru)在(zai)(zai)(zai)(zai)野外、戶外電話等(deng)),用(yong)(yong)(yong)戶可以在(zai)(zai)(zai)(zai)任(ren)何地點(dian)(dian)使(shi)(shi)用(yong)(yong)(yong)、隨(sui)時(shi)(shi)、隨(sui)地進行通(tong)訊(xun)。使(shi)(shi)用(yong)(yong)(yong)方便(bian)、節省成本、節約費(fei)用(yong)(yong)(yong)。下(xia)面我們(men)來了解一下(xia)無(wu)線(xian)(xian)對(dui)(dui)講(jiang)系(xi)(xi)(xi)統(tong)(tong)它主要(yao)是什么(me)優(you)點(dian)(dian)？

1.性能穩定，可(ke)靠性高

在相同無(wu)(wu)線(xian)(xian)傳輸距(ju)離下(xia)，無(wu)(wu)線(xian)(xian)傳輸信(xin)(xin)號(hao)(hao)(hao)更穩定(ding)(ding)由于使(shi)用了功(gong)(gong)率放大器來對(dui)無(wu)(wu)線(xian)(xian)信(xin)(xin)號(hao)(hao)(hao)進行壓縮和放大，使(shi)無(wu)(wu)線(xian)(xian)信(xin)(xin)號(hao)(hao)(hao)更加穩定(ding)(ding)可(ke)靠。無(wu)(wu)線(xian)(xian)信(xin)(xin)號(hao)(hao)(hao)在弱電(dian)磁環境下(xia)也能(neng)(neng)(neng)保持(chi)(chi)較(jiao)好的(de)(de)性(xing)能(neng)(neng)(neng)。無(wu)(wu)線(xian)(xian)對(dui)講(jiang)系(xi)(xi)統(tong)(tong)具(ju)有(you)(you)發射功(gong)(gong)率小、抗千(qian)擾(rao)能(neng)(neng)(neng)力強(qiang)(qiang)(與有(you)(you)線(xian)(xian)對(dui)講(jiang)系(xi)(xi)統(tong)(tong)比較(jiao))和抗電(dian)磁干(gan)(gan)擾(rao)能(neng)(neng)(neng)力強(qiang)(qiang)(與有(you)(you)線(xian)(xian)對(dui)講(jiang)系(xi)(xi)統(tong)(tong)比較(jiao))的(de)(de)特點。無(wu)(wu)線(xian)(xian)對(dui)講(jiang)系(xi)(xi)統(tong)(tong)發射信(xin)(xin)號(hao)(hao)(hao)在發射前和發射后(hou)均能(neng)(neng)(neng)保持(chi)(chi)良(liang)好的(de)(de)性(xing)能(neng)(neng)(neng)，使(shi)用過程中，發射信(xin)(xin)號(hao)(hao)(hao)與接收信(xin)(xin)號(hao)(hao)(hao)完全不受任何千(qian)擾(rao)，可(ke)保持(chi)(chi)很好的(de)(de)穩定(ding)(ding)性(xing)，具(ju)有(you)(you)良(liang)好的(de)(de)抗千(qian)擾(rao)性(xing)和抗低頻(pin)干(gan)(gan)擾(rao)能(neng)(neng)(neng)力，即(ji)使(shi)在惡(e)劣的(de)(de)環境下(xia)也能(neng)(neng)(neng)保持(chi)(chi)較(jiao)好的(de)(de)性(xing)能(neng)(neng)(neng)。因此無(wu)(wu)線(xian)(xian)系(xi)(xi)統(tong)(tong)有(you)(you)較(jiao)高(gao)的(de)(de)可(ke)靠性(xing)。

2.功耗(hao)小(xiao)、不受天氣、濕度(du)的(de)影響

無(wu)線對講系統(tong)在不(bu)(bu)同(tong)的(de)環(huan)境中，無(wu)線通(tong)信設(she)備和(he)有(you)線通(tong)信設(she)備一(yi)(yi)樣都要進(jin)行電(dian)能(neng)的(de)消耗(hao)(hao)。當環(huan)境溫度(du)在-40°C以下時，無(wu)線通(tong)信設(she)備需要每天工作8小(xiao)時左(zuo)右(you)(you);當環(huan)境溫度(du)為-20°C時，每天工作8小(xiao)時左(zuo)右(you)(you);當環(huan)境溫度(du)為-30°C時，每天工作4小(xiao)時左(zuo)右(you)(you)。目前市場(chang)上常見的(de)無(wu)線對講系統(tong)有(you)兩種(zhong)(zhong)電(dian)源(yuan)(yuan)(yuan)(yuan)輸(shu)入方式，一(yi)(yi)種(zhong)(zhong)是(shi)電(dian)源(yuan)(yuan)(yuan)(yuan)輸(shu)入，另(ling)一(yi)(yi)種(zhong)(zhong)是(shi)電(dian)源(yuan)(yuan)(yuan)(yuan)輸(shu)出。從這兩種(zhong)(zhong)方式對系統(tong)的(de)功(gong)耗(hao)(hao)來看，電(dian)源(yuan)(yuan)(yuan)(yuan)輸(shu)入方式的(de)功(gong)耗(hao)(hao)更大一(yi)(yi)些，但是(shi)功(gong)耗(hao)(hao)很小(xiao)。并且設(she)備的(de)工作環(huan)境不(bu)(bu)同(tong)，對電(dian)池的(de)需求(qiu)量也不(bu)(bu)同(tong)，所以功(gong)耗(hao)(hao)也不(bu)(bu)同(tong)。

3信號不受干擾

在(zai)一(yi)(yi)(yi)些(xie)有干(gan)擾(rao)(rao)(rao)的(de)(de)(de)地方，例(li)(li)如(ru)(ru)野外、機場、工(gong)廠(chang)等(deng)，一(yi)(yi)(yi)般采用(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)方式。分(fen)(fen)(fen)頻(pin)(pin)(pin)方式的(de)(de)(de)抗(kang)(kang)干(gan)擾(rao)(rao)(rao)能(neng)力(li)不強(qiang)，其(qi)抗(kang)(kang)干(gan)擾(rao)(rao)(rao)能(neng)力(li)主要(yao)取決(jue)于射(she)頻(pin)(pin)(pin)功率(lv)的(de)(de)(de)大(da)(da)小。分(fen)(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)功率(lv)一(yi)(yi)(yi)般是(shi)(shi)50dB在(zai)50dB左右(you)時(shi)(shi)，其(qi)抗(kang)(kang)干(gan)擾(rao)(rao)(rao)能(neng)力(li)強(qiang)。但由(you)于分(fen)(fen)(fen)頻(pin)(pin)(pin)的(de)(de)(de)干(gan)擾(rao)(rao)(rao)與噪(zao)(zao)(zao)聲(sheng)(主要(yao)是(shi)(shi)周邊噪(zao)(zao)(zao)聲(sheng))具有很強(qiang)的(de)(de)(de)互(hu)通性，當分(fen)(fen)(fen)頻(pin)(pin)(pin)發(fa)射(she)的(de)(de)(de)信(xin)號(hao)(hao)超過50dB時(shi)(shi)，其(qi)抗(kang)(kang)千(qian)(qian)擾(rao)(rao)(rao)能(neng)力(li)就會減弱。另外，在(zai)一(yi)(yi)(yi)些(xie)有噪(zao)(zao)(zao)音的(de)(de)(de)環境(jing)中(zhong)使用(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)，會使分(fen)(fen)(fen)頻(pin)(pin)(pin)信(xin)號(hao)(hao)無(wu)(wu)法到(dao)達(da)發(fa)射(she)端(duan)的(de)(de)(de)接收(shou)機或(huo)(huo)者造(zao)(zao)成(cheng)發(fa)射(she)端(duan)信(xin)號(hao)(hao)與接收(shou)端(duan)信(xin)號(hao)(hao)的(de)(de)(de)糟(zao)合而造(zao)(zao)成(cheng)分(fen)(fen)(fen)頻(pin)(pin)(pin)或(huo)(huo)干(gan)擾(rao)(rao)(rao)(例(li)(li)如(ru)(ru)在(zai)使用(yong)室外電話時(shi)(shi)) 。而采用(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)無(wu)(wu)線對講系(xi)統由(you)于發(fa)射(she)功率(lv)小，分(fen)(fen)(fen)頻(pin)(pin)(pin)后的(de)(de)(de)信(xin)號(hao)(hao)強(qiang)度比有線對講系(xi)統高很多(在(zai)實際使用(yong)中(zhong)分(fen)(fen)(fen)頻(pin)(pin)(pin)設備一(yi)(yi)(yi)般可以(yi)將(jiang)系(xi)統信(xin)號(hao)(hao)分(fen)(fen)(fen)頻(pin)(pin)(pin)到(dao)50dB以(yi)上),信(xin)號(hao)(hao)不受干(gan)擾(rao)(rao)(rao)。如(ru)(ru)果采用(yong)分(fen)(fen)(fen)頻(pin)(pin)(pin)技(ji)術(shu)，需(xu)要(yao)在(zai)較大(da)(da)的(de)(de)(de)回波(bo)功率(lv)下才能(neng)實現信(xin)號(hao)(hao)的(de)(de)(de)分(fen)(fen)(fen)頻(pin)(pin)(pin)工(gong)作(如(ru)(ru)分(fen)(fen)(fen)頻(pin)(pin)(pin)器發(fa)射(she)信(xin)號(hao)(hao)與接收(shou)信(xin)號(hao)(hao)重疊時(shi)(shi)產生的(de)(de)(de)千(qian)(qian)擾(rao)(rao)(rao))和發(fa)送信(xin)號(hao)(hao)強(qiang)度降低(同頻(pin)(pin)(pin)帶內的(de)(de)(de)兩只天線對同一(yi)(yi)(yi)信(xin)道傳(chuan)輸的(de)(de)(de)信(xin)號(hao)(hao)強(qiang)度基本一(yi)(yi)(yi)致(zhi));如(ru)(ru)果采用(yong)混響(xiang)技(ji)術(shu)，則可以(yi)實現對無(wu)(wu)線信(xin)號(hao)(hao)干(gan)擾(rao)(rao)(rao)的(de)(de)(de)抑(yi)制或(huo)(huo)降低。