由于在(zai)戶外、室內等(deng)區(qu)域，無(wu)(wu)(wu)線(xian)對(dui)(dui)(dui)講(jiang)系統(tong)的信(xin)號(hao)強度較(jiao)弱，而且采(cai)用(yong)(yong)頻率調制技術（如 MHZ、 NMR、 BSI等(deng)）產(chan)(chan)生的信(xin)號(hao)傳輸時(shi)(shi)延大，傳輸距離遠。因此(ci)有(you)(you)(you)線(xian)對(dui)(dui)(dui)講(jiang)系統(tong)不(bu)適合在(zai)戶外環(huan)境使(shi)用(yong)(yong)，特別是在(zai)冬(dong)天及(ji)低風速季(ji)節(jie)(jie)使(shi)用(yong)(yong)。雖然無(wu)(wu)(wu)線(xian)對(dui)(dui)(dui)講(jiang)系統(tong)也有(you)(you)(you)著不(bu)錯的效果。但(dan)由于系統(tong)工作時(shi)(shi)會有(you)(you)(you)一(yi)定的干擾，使(shi)對(dui)(dui)(dui)講(jiang)效果下(xia)降，另(ling)外在(zai)信(xin)號(hao)較(jiao)弱時(shi)(shi)對(dui)(dui)(dui)用(yong)(yong)戶語音(yin)產(chan)(chan)生了影(ying)響。特別是在(zai)人員復雜(za)、通(tong)信(xin)距離較(jiao)短(duan)或需(xu)(xu)要(yao)較(jiao)長時(shi)(shi)間使(shi)用(yong)(yong)時(shi)(shi)。因此(ci)，更需(xu)(xu)要(yao)有(you)(you)(you)一(yi)個可(ke)靠的無(wu)(wu)(wu)線(xian)對(dui)(dui)(dui)講(jiang)系統(tong)提供與(yu)有(you)(you)(you)線(xian)對(dui)(dui)(dui)講(jiang)系統(tong)一(yi)樣(yang)的語音(yin)信(xin)息與(yu)控制。無(wu)(wu)(wu)線(xian)對(dui)(dui)(dui)講(jiang)系統(tong)具有(you)(you)(you)很(hen)高的靈活(huo)性，它能夠滿足現(xian)場中(zhong)所有(you)(you)(you)環(huan)境使(shi)用(yong)(yong)需(xu)(xu)求并能隨時(shi)(shi)切(qie)換（如在(zai)野外、戶外電話等(deng)),用(yong)(yong)戶可(ke)以在(zai)任何地點(dian)使(shi)用(yong)(yong)、隨時(shi)(shi)、隨地進行通(tong)訊(xun)。使(shi)用(yong)(yong)方便、節(jie)(jie)省成本、節(jie)(jie)約費用(yong)(yong)。下(xia)面我(wo)們來了解一(yi)下(xia)無(wu)(wu)(wu)線(xian)對(dui)(dui)(dui)講(jiang)系統(tong)它主要(yao)是什么優點(dian)？

1.性(xing)能穩(wen)定，可(ke)靠性(xing)高

在相同無(wu)(wu)線(xian)(xian)(xian)傳輸(shu)距離下(xia)，無(wu)(wu)線(xian)(xian)(xian)傳輸(shu)信(xin)號更穩定由于使(shi)用了(le)功率(lv)放大器來對(dui)(dui)無(wu)(wu)線(xian)(xian)(xian)信(xin)號進行壓縮和(he)(he)放大，使(shi)無(wu)(wu)線(xian)(xian)(xian)信(xin)號更加穩定可(ke)靠(kao)。無(wu)(wu)線(xian)(xian)(xian)信(xin)號在弱電磁環(huan)境(jing)下(xia)也(ye)能(neng)(neng)(neng)(neng)保持較(jiao)好(hao)(hao)的(de)性(xing)(xing)能(neng)(neng)(neng)(neng)。無(wu)(wu)線(xian)(xian)(xian)對(dui)(dui)講系(xi)(xi)統(tong)(tong)(tong)(tong)具有發(fa)射(she)(she)功率(lv)小(xiao)、抗千(qian)擾能(neng)(neng)(neng)(neng)力(li)強(與(yu)有線(xian)(xian)(xian)對(dui)(dui)講系(xi)(xi)統(tong)(tong)(tong)(tong)比(bi)較(jiao))和(he)(he)抗電磁干擾能(neng)(neng)(neng)(neng)力(li)強(與(yu)有線(xian)(xian)(xian)對(dui)(dui)講系(xi)(xi)統(tong)(tong)(tong)(tong)比(bi)較(jiao))的(de)特點。無(wu)(wu)線(xian)(xian)(xian)對(dui)(dui)講系(xi)(xi)統(tong)(tong)(tong)(tong)發(fa)射(she)(she)信(xin)號在發(fa)射(she)(she)前和(he)(he)發(fa)射(she)(she)后均能(neng)(neng)(neng)(neng)保持良好(hao)(hao)的(de)性(xing)(xing)能(neng)(neng)(neng)(neng)，使(shi)用過程中，發(fa)射(she)(she)信(xin)號與(yu)接收(shou)信(xin)號完全不受任(ren)何千(qian)擾，可(ke)保持很好(hao)(hao)的(de)穩定性(xing)(xing)，具有良好(hao)(hao)的(de)抗千(qian)擾性(xing)(xing)和(he)(he)抗低(di)頻干擾能(neng)(neng)(neng)(neng)力(li)，即使(shi)在惡劣(lie)的(de)環(huan)境(jing)下(xia)也(ye)能(neng)(neng)(neng)(neng)保持較(jiao)好(hao)(hao)的(de)性(xing)(xing)能(neng)(neng)(neng)(neng)。因此無(wu)(wu)線(xian)(xian)(xian)系(xi)(xi)統(tong)(tong)(tong)(tong)有較(jiao)高的(de)可(ke)靠(kao)性(xing)(xing)。

2.功耗小(xiao)、不受天氣、濕度的影響

無線(xian)(xian)對(dui)講(jiang)系(xi)統在不(bu)同(tong)的環(huan)境(jing)中，無線(xian)(xian)通(tong)信設備和(he)有線(xian)(xian)通(tong)信設備一(yi)(yi)樣都要進行電(dian)(dian)能(neng)的消耗(hao)(hao)。當環(huan)境(jing)溫度在-40°C以下時(shi)(shi)，無線(xian)(xian)通(tong)信設備需(xu)要每(mei)天(tian)工(gong)作8小時(shi)(shi)左(zuo)右(you);當環(huan)境(jing)溫度為(wei)(wei)-20°C時(shi)(shi)，每(mei)天(tian)工(gong)作8小時(shi)(shi)左(zuo)右(you);當環(huan)境(jing)溫度為(wei)(wei)-30°C時(shi)(shi)，每(mei)天(tian)工(gong)作4小時(shi)(shi)左(zuo)右(you)。目前市場上常(chang)見的無線(xian)(xian)對(dui)講(jiang)系(xi)統有兩種(zhong)(zhong)電(dian)(dian)源(yuan)輸入方(fang)(fang)式，一(yi)(yi)種(zhong)(zhong)是(shi)電(dian)(dian)源(yuan)輸入，另(ling)一(yi)(yi)種(zhong)(zhong)是(shi)電(dian)(dian)源(yuan)輸出。從(cong)這兩種(zhong)(zhong)方(fang)(fang)式對(dui)系(xi)統的功耗(hao)(hao)來看，電(dian)(dian)源(yuan)輸入方(fang)(fang)式的功耗(hao)(hao)更大(da)一(yi)(yi)些，但是(shi)功耗(hao)(hao)很(hen)小。并且設備的工(gong)作環(huan)境(jing)不(bu)同(tong)，對(dui)電(dian)(dian)池的需(xu)求量也不(bu)同(tong)，所以功耗(hao)(hao)也不(bu)同(tong)。

3信號不受干擾

在一(yi)(yi)些(xie)有(you)干(gan)(gan)(gan)擾(rao)的(de)(de)(de)(de)地方，例(li)如野(ye)外(wai)、機場、工廠等，一(yi)(yi)般(ban)(ban)采(cai)用分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)方式。分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)方式的(de)(de)(de)(de)抗干(gan)(gan)(gan)擾(rao)能力(li)不強，其(qi)抗干(gan)(gan)(gan)擾(rao)能力(li)主要(yao)取決于(yu)射(she)頻(pin)(pin)(pin)(pin)(pin)(pin)功(gong)(gong)率的(de)(de)(de)(de)大小。分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)(de)功(gong)(gong)率一(yi)(yi)般(ban)(ban)是50dB在50dB左右(you)時(shi)(shi)，其(qi)抗干(gan)(gan)(gan)擾(rao)能力(li)強。但由(you)于(yu)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)的(de)(de)(de)(de)干(gan)(gan)(gan)擾(rao)與噪(zao)聲(主要(yao)是周邊噪(zao)聲)具有(you)很(hen)強的(de)(de)(de)(de)互通性，當分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)發射(she)的(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)超過50dB時(shi)(shi)，其(qi)抗千(qian)擾(rao)能力(li)就會減(jian)弱(ruo)。另外(wai)，在一(yi)(yi)些(xie)有(you)噪(zao)音(yin)的(de)(de)(de)(de)環境(jing)中使(shi)用分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)，會使(shi)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)無法到達發射(she)端(duan)的(de)(de)(de)(de)接收(shou)機或(huo)者(zhe)造成(cheng)發射(she)端(duan)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)與接收(shou)端(duan)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)糟合(he)而造成(cheng)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)或(huo)干(gan)(gan)(gan)擾(rao)(例(li)如在使(shi)用室外(wai)電(dian)話時(shi)(shi)) 。而采(cai)用分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)(de)無線對講(jiang)系統由(you)于(yu)發射(she)功(gong)(gong)率小，分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)后的(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強度比有(you)線對講(jiang)系統高很(hen)多(duo)(在實(shi)際使(shi)用中分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)設備(bei)一(yi)(yi)般(ban)(ban)可以(yi)(yi)將系統信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)到50dB以(yi)(yi)上(shang)),信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)不受干(gan)(gan)(gan)擾(rao)。如果(guo)采(cai)用分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)，需要(yao)在較(jiao)大的(de)(de)(de)(de)回波功(gong)(gong)率下才(cai)能實(shi)現(xian)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)工作(如分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)器發射(she)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)與接收(shou)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)重疊(die)時(shi)(shi)產生(sheng)的(de)(de)(de)(de)千(qian)擾(rao))和發送信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強度降低(di)(同頻(pin)(pin)(pin)(pin)(pin)(pin)帶(dai)內的(de)(de)(de)(de)兩只(zhi)天(tian)線對同一(yi)(yi)信(xin)(xin)(xin)(xin)道傳(chuan)輸的(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強度基本一(yi)(yi)致);如果(guo)采(cai)用混響(xiang)技(ji)術(shu)，則(ze)可以(yi)(yi)實(shi)現(xian)對無線信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)干(gan)(gan)(gan)擾(rao)的(de)(de)(de)(de)抑制或(huo)降低(di)。