由于(yu)在(zai)(zai)戶(hu)外、室(shi)內等區域(yu)，無(wu)線對(dui)(dui)講(jiang)系(xi)統(tong)(tong)(tong)的(de)信號(hao)強(qiang)度(du)較弱，而且采用(yong)(yong)(yong)頻率調制(zhi)技(ji)術（如 MHZ、 NMR、 BSI等）產生的(de)信號(hao)傳輸時(shi)(shi)延(yan)大，傳輸距離(li)遠。因(yin)此有(you)線對(dui)(dui)講(jiang)系(xi)統(tong)(tong)(tong)不適合在(zai)(zai)戶(hu)外環境(jing)使(shi)用(yong)(yong)(yong)，特別是(shi)在(zai)(zai)冬(dong)天及低風(feng)速季(ji)節使(shi)用(yong)(yong)(yong)。雖然無(wu)線對(dui)(dui)講(jiang)系(xi)統(tong)(tong)(tong)也有(you)著不錯的(de)效果(guo)。但由于(yu)系(xi)統(tong)(tong)(tong)工作時(shi)(shi)會有(you)一(yi)定的(de)干(gan)擾(rao)，使(shi)對(dui)(dui)講(jiang)效果(guo)下(xia)降，另外在(zai)(zai)信號(hao)較弱時(shi)(shi)對(dui)(dui)用(yong)(yong)(yong)戶(hu)語音產生了影響。特別是(shi)在(zai)(zai)人員復雜(za)、通信距離(li)較短或需要(yao)較長時(shi)(shi)間(jian)使(shi)用(yong)(yong)(yong)時(shi)(shi)。因(yin)此，更需要(yao)有(you)一(yi)個(ge)可靠的(de)無(wu)線對(dui)(dui)講(jiang)系(xi)統(tong)(tong)(tong)提供(gong)與有(you)線對(dui)(dui)講(jiang)系(xi)統(tong)(tong)(tong)一(yi)樣(yang)的(de)語音信息與控制(zhi)。無(wu)線對(dui)(dui)講(jiang)系(xi)統(tong)(tong)(tong)具(ju)有(you)很高的(de)靈(ling)活性，它(ta)能(neng)(neng)夠滿足現(xian)場中(zhong)所有(you)環境(jing)使(shi)用(yong)(yong)(yong)需求并能(neng)(neng)隨(sui)時(shi)(shi)切(qie)換(huan)（如在(zai)(zai)野(ye)外、戶(hu)外電話等),用(yong)(yong)(yong)戶(hu)可以(yi)在(zai)(zai)任何地點使(shi)用(yong)(yong)(yong)、隨(sui)時(shi)(shi)、隨(sui)地進行通訊。使(shi)用(yong)(yong)(yong)方(fang)便、節省成(cheng)本、節約(yue)費(fei)用(yong)(yong)(yong)。下(xia)面我(wo)們來了解一(yi)下(xia)無(wu)線對(dui)(dui)講(jiang)系(xi)統(tong)(tong)(tong)它(ta)主要(yao)是(shi)什么(me)優點？

1.性能穩定，可靠性高

在(zai)(zai)相同(tong)無(wu)(wu)(wu)線傳輸距離下，無(wu)(wu)(wu)線傳輸信(xin)(xin)號(hao)更穩(wen)定(ding)(ding)由于使(shi)用了功率放大(da)器來對(dui)無(wu)(wu)(wu)線信(xin)(xin)號(hao)進行壓縮和(he)(he)放大(da)，使(shi)無(wu)(wu)(wu)線信(xin)(xin)號(hao)更加穩(wen)定(ding)(ding)可(ke)靠。無(wu)(wu)(wu)線信(xin)(xin)號(hao)在(zai)(zai)弱電(dian)磁(ci)環境(jing)(jing)下也(ye)能(neng)(neng)保(bao)持(chi)較好的(de)性能(neng)(neng)。無(wu)(wu)(wu)線對(dui)講(jiang)系統(tong)(tong)具有(you)(you)(you)發(fa)射功率小、抗(kang)(kang)千(qian)擾(rao)能(neng)(neng)力強(與(yu)有(you)(you)(you)線對(dui)講(jiang)系統(tong)(tong)比(bi)較)和(he)(he)抗(kang)(kang)電(dian)磁(ci)干擾(rao)能(neng)(neng)力強(與(yu)有(you)(you)(you)線對(dui)講(jiang)系統(tong)(tong)比(bi)較)的(de)特點(dian)。無(wu)(wu)(wu)線對(dui)講(jiang)系統(tong)(tong)發(fa)射信(xin)(xin)號(hao)在(zai)(zai)發(fa)射前和(he)(he)發(fa)射后均能(neng)(neng)保(bao)持(chi)良好的(de)性能(neng)(neng)，使(shi)用過(guo)程中，發(fa)射信(xin)(xin)號(hao)與(yu)接收信(xin)(xin)號(hao)完全不(bu)受任何千(qian)擾(rao)，可(ke)保(bao)持(chi)很好的(de)穩(wen)定(ding)(ding)性，具有(you)(you)(you)良好的(de)抗(kang)(kang)千(qian)擾(rao)性和(he)(he)抗(kang)(kang)低(di)頻干擾(rao)能(neng)(neng)力，即使(shi)在(zai)(zai)惡(e)劣的(de)環境(jing)(jing)下也(ye)能(neng)(neng)保(bao)持(chi)較好的(de)性能(neng)(neng)。因此無(wu)(wu)(wu)線系統(tong)(tong)有(you)(you)(you)較高的(de)可(ke)靠性。

2.功耗小、不(bu)受天氣、濕度的影(ying)響

無(wu)(wu)線(xian)(xian)對(dui)(dui)講系統在不同(tong)(tong)(tong)的(de)(de)環(huan)(huan)境(jing)中，無(wu)(wu)線(xian)(xian)通信設備(bei)和(he)有線(xian)(xian)通信設備(bei)一樣都要(yao)進行電(dian)能的(de)(de)消耗(hao)。當(dang)環(huan)(huan)境(jing)溫度在-40°C以下(xia)時(shi)，無(wu)(wu)線(xian)(xian)通信設備(bei)需(xu)要(yao)每(mei)天(tian)工作8小(xiao)時(shi)左右(you);當(dang)環(huan)(huan)境(jing)溫度為-20°C時(shi)，每(mei)天(tian)工作8小(xiao)時(shi)左右(you);當(dang)環(huan)(huan)境(jing)溫度為-30°C時(shi)，每(mei)天(tian)工作4小(xiao)時(shi)左右(you)。目前市場上(shang)常見(jian)的(de)(de)無(wu)(wu)線(xian)(xian)對(dui)(dui)講系統有兩(liang)種(zhong)電(dian)源(yuan)輸(shu)入(ru)方式，一種(zhong)是電(dian)源(yuan)輸(shu)入(ru)，另一種(zhong)是電(dian)源(yuan)輸(shu)出。從這兩(liang)種(zhong)方式對(dui)(dui)系統的(de)(de)功(gong)(gong)耗(hao)來看，電(dian)源(yuan)輸(shu)入(ru)方式的(de)(de)功(gong)(gong)耗(hao)更大一些(xie)，但(dan)是功(gong)(gong)耗(hao)很小(xiao)。并且設備(bei)的(de)(de)工作環(huan)(huan)境(jing)不同(tong)(tong)(tong)，對(dui)(dui)電(dian)池的(de)(de)需(xu)求量也不同(tong)(tong)(tong)，所(suo)以功(gong)(gong)耗(hao)也不同(tong)(tong)(tong)。

3信號不受干擾

在(zai)(zai)一(yi)(yi)些(xie)有干(gan)(gan)(gan)(gan)擾(rao)的(de)(de)(de)地方(fang)，例如(ru)野(ye)外、機場、工(gong)(gong)廠等，一(yi)(yi)般采(cai)用(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)方(fang)式。分(fen)(fen)(fen)頻(pin)(pin)方(fang)式的(de)(de)(de)抗干(gan)(gan)(gan)(gan)擾(rao)能力不強，其(qi)(qi)抗干(gan)(gan)(gan)(gan)擾(rao)能力主(zhu)(zhu)要取決于射(she)(she)(she)頻(pin)(pin)功(gong)率(lv)的(de)(de)(de)大小。分(fen)(fen)(fen)頻(pin)(pin)技術的(de)(de)(de)功(gong)率(lv)一(yi)(yi)般是50dB在(zai)(zai)50dB左右(you)時(shi)(shi)，其(qi)(qi)抗干(gan)(gan)(gan)(gan)擾(rao)能力強。但由于分(fen)(fen)(fen)頻(pin)(pin)的(de)(de)(de)干(gan)(gan)(gan)(gan)擾(rao)與(yu)(yu)噪聲(主(zhu)(zhu)要是周邊(bian)噪聲)具有很(hen)強的(de)(de)(de)互通性，當(dang)分(fen)(fen)(fen)頻(pin)(pin)發射(she)(she)(she)的(de)(de)(de)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)超過50dB時(shi)(shi)，其(qi)(qi)抗千擾(rao)能力就會減弱。另外，在(zai)(zai)一(yi)(yi)些(xie)有噪音(yin)的(de)(de)(de)環境中使(shi)用(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)技術，會使(shi)分(fen)(fen)(fen)頻(pin)(pin)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)無法(fa)到(dao)達發射(she)(she)(she)端的(de)(de)(de)接(jie)收(shou)機或者造成(cheng)發射(she)(she)(she)端信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)與(yu)(yu)接(jie)收(shou)端信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)的(de)(de)(de)糟合而造成(cheng)分(fen)(fen)(fen)頻(pin)(pin)或干(gan)(gan)(gan)(gan)擾(rao)(例如(ru)在(zai)(zai)使(shi)用(yong)(yong)室外電話時(shi)(shi)) 。而采(cai)用(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)技術的(de)(de)(de)無線對(dui)講系統由于發射(she)(she)(she)功(gong)率(lv)小，分(fen)(fen)(fen)頻(pin)(pin)后的(de)(de)(de)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)強度比有線對(dui)講系統高很(hen)多(在(zai)(zai)實(shi)(shi)際(ji)使(shi)用(yong)(yong)中分(fen)(fen)(fen)頻(pin)(pin)設備一(yi)(yi)般可(ke)以將系統信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)分(fen)(fen)(fen)頻(pin)(pin)到(dao)50dB以上(shang)),信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)不受(shou)干(gan)(gan)(gan)(gan)擾(rao)。如(ru)果采(cai)用(yong)(yong)分(fen)(fen)(fen)頻(pin)(pin)技術，需要在(zai)(zai)較大的(de)(de)(de)回波功(gong)率(lv)下才(cai)能實(shi)(shi)現信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)的(de)(de)(de)分(fen)(fen)(fen)頻(pin)(pin)工(gong)(gong)作(如(ru)分(fen)(fen)(fen)頻(pin)(pin)器發射(she)(she)(she)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)與(yu)(yu)接(jie)收(shou)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)重疊時(shi)(shi)產生的(de)(de)(de)千擾(rao))和發送(song)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)強度降低(同頻(pin)(pin)帶內的(de)(de)(de)兩只(zhi)天(tian)線對(dui)同一(yi)(yi)信(xin)(xin)(xin)(xin)(xin)道傳輸的(de)(de)(de)信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)強度基本(ben)一(yi)(yi)致);如(ru)果采(cai)用(yong)(yong)混響技術，則可(ke)以實(shi)(shi)現對(dui)無線信(xin)(xin)(xin)(xin)(xin)號(hao)(hao)(hao)(hao)(hao)干(gan)(gan)(gan)(gan)擾(rao)的(de)(de)(de)抑制(zhi)或降低。