由于(yu)在(zai)戶(hu)(hu)外、室(shi)內等區(qu)域，無(wu)(wu)線(xian)對(dui)講(jiang)系(xi)(xi)(xi)統(tong)(tong)的(de)(de)(de)信號強度(du)較弱(ruo)(ruo)，而且采用(yong)(yong)(yong)頻率調制(zhi)技術（如 MHZ、 NMR、 BSI等）產生的(de)(de)(de)信號傳輸(shu)(shu)時(shi)延大，傳輸(shu)(shu)距(ju)離遠(yuan)。因(yin)此(ci)有線(xian)對(dui)講(jiang)系(xi)(xi)(xi)統(tong)(tong)不(bu)(bu)適合在(zai)戶(hu)(hu)外環(huan)(huan)境使(shi)(shi)(shi)用(yong)(yong)(yong)，特別(bie)是在(zai)冬天及(ji)低(di)風速季節使(shi)(shi)(shi)用(yong)(yong)(yong)。雖然無(wu)(wu)線(xian)對(dui)講(jiang)系(xi)(xi)(xi)統(tong)(tong)也有著不(bu)(bu)錯(cuo)的(de)(de)(de)效(xiao)果。但(dan)由于(yu)系(xi)(xi)(xi)統(tong)(tong)工作(zuo)時(shi)會(hui)有一(yi)定(ding)的(de)(de)(de)干(gan)擾(rao)，使(shi)(shi)(shi)對(dui)講(jiang)效(xiao)果下降(jiang)，另外在(zai)信號較弱(ruo)(ruo)時(shi)對(dui)用(yong)(yong)(yong)戶(hu)(hu)語(yu)音(yin)產生了(le)影響。特別(bie)是在(zai)人員復雜、通信距(ju)離較短或需要較長時(shi)間使(shi)(shi)(shi)用(yong)(yong)(yong)時(shi)。因(yin)此(ci)，更需要有一(yi)個可靠(kao)的(de)(de)(de)無(wu)(wu)線(xian)對(dui)講(jiang)系(xi)(xi)(xi)統(tong)(tong)提供與有線(xian)對(dui)講(jiang)系(xi)(xi)(xi)統(tong)(tong)一(yi)樣的(de)(de)(de)語(yu)音(yin)信息與控制(zhi)。無(wu)(wu)線(xian)對(dui)講(jiang)系(xi)(xi)(xi)統(tong)(tong)具(ju)有很高的(de)(de)(de)靈活性，它(ta)能夠滿足現(xian)場中所(suo)有環(huan)(huan)境使(shi)(shi)(shi)用(yong)(yong)(yong)需求并能隨(sui)(sui)時(shi)切換（如在(zai)野外、戶(hu)(hu)外電話等),用(yong)(yong)(yong)戶(hu)(hu)可以在(zai)任何地(di)點使(shi)(shi)(shi)用(yong)(yong)(yong)、隨(sui)(sui)時(shi)、隨(sui)(sui)地(di)進行(xing)通訊(xun)。使(shi)(shi)(shi)用(yong)(yong)(yong)方便、節省成本、節約費用(yong)(yong)(yong)。下面我們來了(le)解一(yi)下無(wu)(wu)線(xian)對(dui)講(jiang)系(xi)(xi)(xi)統(tong)(tong)它(ta)主要是什么優點？

1.性(xing)能穩定，可靠性(xing)高

在(zai)相同無(wu)線(xian)(xian)(xian)傳輸(shu)距離下(xia)(xia)，無(wu)線(xian)(xian)(xian)傳輸(shu)信(xin)(xin)號(hao)更(geng)穩(wen)(wen)定由于使用了功(gong)率放大(da)器(qi)來對無(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)進行壓縮和(he)(he)放大(da)，使無(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)更(geng)加穩(wen)(wen)定可靠。無(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)在(zai)弱電磁環境(jing)下(xia)(xia)也(ye)能(neng)(neng)保持(chi)(chi)較好的(de)(de)(de)性(xing)能(neng)(neng)。無(wu)線(xian)(xian)(xian)對講系(xi)(xi)(xi)統(tong)(tong)具有(you)發射(she)功(gong)率小、抗(kang)(kang)千擾(rao)(rao)能(neng)(neng)力強(與有(you)線(xian)(xian)(xian)對講系(xi)(xi)(xi)統(tong)(tong)比較)和(he)(he)抗(kang)(kang)電磁干(gan)擾(rao)(rao)能(neng)(neng)力強(與有(you)線(xian)(xian)(xian)對講系(xi)(xi)(xi)統(tong)(tong)比較)的(de)(de)(de)特點。無(wu)線(xian)(xian)(xian)對講系(xi)(xi)(xi)統(tong)(tong)發射(she)信(xin)(xin)號(hao)在(zai)發射(she)前和(he)(he)發射(she)后均能(neng)(neng)保持(chi)(chi)良好的(de)(de)(de)性(xing)能(neng)(neng)，使用過(guo)程中(zhong)，發射(she)信(xin)(xin)號(hao)與接收信(xin)(xin)號(hao)完全不受任何千擾(rao)(rao)，可保持(chi)(chi)很好的(de)(de)(de)穩(wen)(wen)定性(xing)，具有(you)良好的(de)(de)(de)抗(kang)(kang)千擾(rao)(rao)性(xing)和(he)(he)抗(kang)(kang)低頻(pin)干(gan)擾(rao)(rao)能(neng)(neng)力，即使在(zai)惡劣的(de)(de)(de)環境(jing)下(xia)(xia)也(ye)能(neng)(neng)保持(chi)(chi)較好的(de)(de)(de)性(xing)能(neng)(neng)。因此無(wu)線(xian)(xian)(xian)系(xi)(xi)(xi)統(tong)(tong)有(you)較高(gao)的(de)(de)(de)可靠性(xing)。

2.功耗(hao)小、不(bu)受天(tian)氣、濕(shi)度的影響

無(wu)線(xian)(xian)對(dui)(dui)講(jiang)系統(tong)在(zai)不同的環(huan)(huan)(huan)境(jing)(jing)(jing)中，無(wu)線(xian)(xian)通信(xin)設(she)備(bei)和有(you)線(xian)(xian)通信(xin)設(she)備(bei)一(yi)樣都要進(jin)行電能的消耗。當環(huan)(huan)(huan)境(jing)(jing)(jing)溫(wen)度在(zai)-40°C以(yi)下時，無(wu)線(xian)(xian)通信(xin)設(she)備(bei)需要每天工作(zuo)8小(xiao)時左右(you)(you);當環(huan)(huan)(huan)境(jing)(jing)(jing)溫(wen)度為-20°C時，每天工作(zuo)8小(xiao)時左右(you)(you);當環(huan)(huan)(huan)境(jing)(jing)(jing)溫(wen)度為-30°C時，每天工作(zuo)4小(xiao)時左右(you)(you)。目前市(shi)場上常(chang)見的無(wu)線(xian)(xian)對(dui)(dui)講(jiang)系統(tong)有(you)兩種電源(yuan)(yuan)輸入方式，一(yi)種是電源(yuan)(yuan)輸入，另(ling)一(yi)種是電源(yuan)(yuan)輸出(chu)。從這兩種方式對(dui)(dui)系統(tong)的功(gong)耗來(lai)看，電源(yuan)(yuan)輸入方式的功(gong)耗更大(da)一(yi)些，但是功(gong)耗很小(xiao)。并且設(she)備(bei)的工作(zuo)環(huan)(huan)(huan)境(jing)(jing)(jing)不同，對(dui)(dui)電池的需求(qiu)量也不同，所以(yi)功(gong)耗也不同。

3信號不受干擾

在(zai)(zai)(zai)(zai)一(yi)些有干(gan)(gan)擾(rao)的(de)(de)(de)(de)(de)地方(fang)，例如(ru)(ru)野外(wai)、機場、工(gong)廠等，一(yi)般采(cai)用分(fen)(fen)(fen)頻(pin)(pin)方(fang)式(shi)。分(fen)(fen)(fen)頻(pin)(pin)方(fang)式(shi)的(de)(de)(de)(de)(de)抗干(gan)(gan)擾(rao)能(neng)力(li)不強，其(qi)抗干(gan)(gan)擾(rao)能(neng)力(li)主要(yao)取決于(yu)射(she)頻(pin)(pin)功(gong)(gong)率的(de)(de)(de)(de)(de)大小。分(fen)(fen)(fen)頻(pin)(pin)技術的(de)(de)(de)(de)(de)功(gong)(gong)率一(yi)般是(shi)50dB在(zai)(zai)(zai)(zai)50dB左右時，其(qi)抗干(gan)(gan)擾(rao)能(neng)力(li)強。但由于(yu)分(fen)(fen)(fen)頻(pin)(pin)的(de)(de)(de)(de)(de)干(gan)(gan)擾(rao)與(yu)噪(zao)聲(主要(yao)是(shi)周邊噪(zao)聲)具有很強的(de)(de)(de)(de)(de)互通(tong)性，當分(fen)(fen)(fen)頻(pin)(pin)發射(she)的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)超過50dB時，其(qi)抗千(qian)擾(rao)能(neng)力(li)就會減(jian)弱。另外(wai)，在(zai)(zai)(zai)(zai)一(yi)些有噪(zao)音的(de)(de)(de)(de)(de)環境中(zhong)使(shi)用分(fen)(fen)(fen)頻(pin)(pin)技術，會使(shi)分(fen)(fen)(fen)頻(pin)(pin)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)無(wu)法到(dao)(dao)達發射(she)端的(de)(de)(de)(de)(de)接收(shou)機或者(zhe)造(zao)成發射(she)端信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接收(shou)端信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)(de)糟(zao)合而(er)造(zao)成分(fen)(fen)(fen)頻(pin)(pin)或干(gan)(gan)擾(rao)(例如(ru)(ru)在(zai)(zai)(zai)(zai)使(shi)用室外(wai)電話(hua)時) 。而(er)采(cai)用分(fen)(fen)(fen)頻(pin)(pin)技術的(de)(de)(de)(de)(de)無(wu)線對(dui)講系(xi)統(tong)由于(yu)發射(she)功(gong)(gong)率小，分(fen)(fen)(fen)頻(pin)(pin)后的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強度(du)比有線對(dui)講系(xi)統(tong)高很多(在(zai)(zai)(zai)(zai)實際(ji)使(shi)用中(zhong)分(fen)(fen)(fen)頻(pin)(pin)設(she)備一(yi)般可以將系(xi)統(tong)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)分(fen)(fen)(fen)頻(pin)(pin)到(dao)(dao)50dB以上),信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)不受干(gan)(gan)擾(rao)。如(ru)(ru)果采(cai)用分(fen)(fen)(fen)頻(pin)(pin)技術，需要(yao)在(zai)(zai)(zai)(zai)較大的(de)(de)(de)(de)(de)回波功(gong)(gong)率下才能(neng)實現(xian)(xian)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)(de)分(fen)(fen)(fen)頻(pin)(pin)工(gong)作(zuo)(如(ru)(ru)分(fen)(fen)(fen)頻(pin)(pin)器發射(she)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接收(shou)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)重疊時產(chan)生的(de)(de)(de)(de)(de)千(qian)擾(rao))和(he)發送信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強度(du)降(jiang)低(同(tong)(tong)頻(pin)(pin)帶(dai)內的(de)(de)(de)(de)(de)兩只天線對(dui)同(tong)(tong)一(yi)信(xin)(xin)(xin)(xin)道(dao)傳(chuan)輸的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強度(du)基本一(yi)致);如(ru)(ru)果采(cai)用混響技術，則(ze)可以實現(xian)(xian)對(dui)無(wu)線信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)干(gan)(gan)擾(rao)的(de)(de)(de)(de)(de)抑制或降(jiang)低。