由(you)于在(zai)(zai)(zai)戶(hu)(hu)外(wai)(wai)(wai)、室內等區(qu)域，無(wu)(wu)線對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)的(de)信號(hao)強度較弱，而(er)且采用(yong)(yong)頻率調制(zhi)(zhi)技術(shu)（如 MHZ、 NMR、 BSI等）產(chan)生的(de)信號(hao)傳(chuan)輸時延(yan)大，傳(chuan)輸距離(li)(li)遠。因(yin)此有(you)線對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)不(bu)適合在(zai)(zai)(zai)戶(hu)(hu)外(wai)(wai)(wai)環(huan)(huan)境(jing)(jing)使(shi)(shi)(shi)用(yong)(yong)，特(te)別是(shi)(shi)在(zai)(zai)(zai)冬天及低風速季(ji)節使(shi)(shi)(shi)用(yong)(yong)。雖然無(wu)(wu)線對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)也有(you)著不(bu)錯(cuo)的(de)效果(guo)。但由(you)于系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)工作(zuo)時會有(you)一(yi)定的(de)干擾，使(shi)(shi)(shi)對(dui)(dui)(dui)講(jiang)(jiang)效果(guo)下(xia)降，另(ling)外(wai)(wai)(wai)在(zai)(zai)(zai)信號(hao)較弱時對(dui)(dui)(dui)用(yong)(yong)戶(hu)(hu)語音產(chan)生了影響(xiang)。特(te)別是(shi)(shi)在(zai)(zai)(zai)人員復雜、通信距離(li)(li)較短或需要(yao)較長時間使(shi)(shi)(shi)用(yong)(yong)時。因(yin)此，更需要(yao)有(you)一(yi)個(ge)可靠的(de)無(wu)(wu)線對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)提供與有(you)線對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)一(yi)樣的(de)語音信息與控制(zhi)(zhi)。無(wu)(wu)線對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)具有(you)很高的(de)靈活性，它能夠滿足現場(chang)中所有(you)環(huan)(huan)境(jing)(jing)使(shi)(shi)(shi)用(yong)(yong)需求(qiu)并(bing)能隨時切換（如在(zai)(zai)(zai)野(ye)外(wai)(wai)(wai)、戶(hu)(hu)外(wai)(wai)(wai)電(dian)話等),用(yong)(yong)戶(hu)(hu)可以在(zai)(zai)(zai)任何(he)地點使(shi)(shi)(shi)用(yong)(yong)、隨時、隨地進行通訊。使(shi)(shi)(shi)用(yong)(yong)方便、節省成本(ben)、節約費用(yong)(yong)。下(xia)面我們來了解一(yi)下(xia)無(wu)(wu)線對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)它主要(yao)是(shi)(shi)什么(me)優(you)點？

1.性(xing)能(neng)穩定，可靠性(xing)高

在(zai)(zai)相(xiang)同無(wu)(wu)線(xian)傳輸距離下，無(wu)(wu)線(xian)傳輸信(xin)號(hao)(hao)更(geng)穩定(ding)(ding)由于(yu)使(shi)用(yong)了功率放(fang)大器來對無(wu)(wu)線(xian)信(xin)號(hao)(hao)進行壓縮(suo)和(he)放(fang)大，使(shi)無(wu)(wu)線(xian)信(xin)號(hao)(hao)更(geng)加穩定(ding)(ding)可(ke)(ke)靠(kao)。無(wu)(wu)線(xian)信(xin)號(hao)(hao)在(zai)(zai)弱(ruo)電磁(ci)環境(jing)下也(ye)能(neng)(neng)(neng)保(bao)持較(jiao)好(hao)的(de)(de)性(xing)能(neng)(neng)(neng)。無(wu)(wu)線(xian)對講(jiang)系(xi)(xi)統(tong)具有發射(she)(she)功率小、抗千擾(rao)能(neng)(neng)(neng)力(li)強(與有線(xian)對講(jiang)系(xi)(xi)統(tong)比較(jiao))和(he)抗電磁(ci)干擾(rao)能(neng)(neng)(neng)力(li)強(與有線(xian)對講(jiang)系(xi)(xi)統(tong)比較(jiao))的(de)(de)特點。無(wu)(wu)線(xian)對講(jiang)系(xi)(xi)統(tong)發射(she)(she)信(xin)號(hao)(hao)在(zai)(zai)發射(she)(she)前和(he)發射(she)(she)后均(jun)能(neng)(neng)(neng)保(bao)持良(liang)好(hao)的(de)(de)性(xing)能(neng)(neng)(neng)，使(shi)用(yong)過程中，發射(she)(she)信(xin)號(hao)(hao)與接收(shou)信(xin)號(hao)(hao)完全不受任(ren)何(he)千擾(rao)，可(ke)(ke)保(bao)持很好(hao)的(de)(de)穩定(ding)(ding)性(xing)，具有良(liang)好(hao)的(de)(de)抗千擾(rao)性(xing)和(he)抗低頻干擾(rao)能(neng)(neng)(neng)力(li)，即使(shi)在(zai)(zai)惡(e)劣的(de)(de)環境(jing)下也(ye)能(neng)(neng)(neng)保(bao)持較(jiao)好(hao)的(de)(de)性(xing)能(neng)(neng)(neng)。因(yin)此(ci)無(wu)(wu)線(xian)系(xi)(xi)統(tong)有較(jiao)高的(de)(de)可(ke)(ke)靠(kao)性(xing)。

2.功耗小、不受(shou)天(tian)氣、濕度的影響

無(wu)線(xian)對(dui)講系(xi)統(tong)在不同的(de)環(huan)境中，無(wu)線(xian)通信(xin)設(she)備(bei)(bei)(bei)和有線(xian)通信(xin)設(she)備(bei)(bei)(bei)一(yi)樣都要進行電(dian)(dian)能的(de)消耗(hao)(hao)。當(dang)環(huan)境溫(wen)(wen)度(du)在-40°C以(yi)下時(shi)(shi)(shi)，無(wu)線(xian)通信(xin)設(she)備(bei)(bei)(bei)需要每天(tian)工作8小時(shi)(shi)(shi)左右(you);當(dang)環(huan)境溫(wen)(wen)度(du)為-20°C時(shi)(shi)(shi)，每天(tian)工作8小時(shi)(shi)(shi)左右(you);當(dang)環(huan)境溫(wen)(wen)度(du)為-30°C時(shi)(shi)(shi)，每天(tian)工作4小時(shi)(shi)(shi)左右(you)。目(mu)前市場上常(chang)見的(de)無(wu)線(xian)對(dui)講系(xi)統(tong)有兩種(zhong)電(dian)(dian)源(yuan)輸(shu)(shu)入(ru)方式，一(yi)種(zhong)是電(dian)(dian)源(yuan)輸(shu)(shu)入(ru)，另一(yi)種(zhong)是電(dian)(dian)源(yuan)輸(shu)(shu)出。從這兩種(zhong)方式對(dui)系(xi)統(tong)的(de)功(gong)耗(hao)(hao)來(lai)看(kan)，電(dian)(dian)源(yuan)輸(shu)(shu)入(ru)方式的(de)功(gong)耗(hao)(hao)更大一(yi)些，但是功(gong)耗(hao)(hao)很(hen)小。并且設(she)備(bei)(bei)(bei)的(de)工作環(huan)境不同，對(dui)電(dian)(dian)池的(de)需求量也不同，所以(yi)功(gong)耗(hao)(hao)也不同。

3信號不受干擾

在(zai)(zai)一些有(you)干(gan)(gan)擾(rao)(rao)的(de)(de)(de)(de)(de)地方(fang)(fang)，例(li)如(ru)(ru)(ru)野外(wai)、機(ji)場、工廠等，一般采(cai)(cai)用分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)方(fang)(fang)式。分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)方(fang)(fang)式的(de)(de)(de)(de)(de)抗(kang)干(gan)(gan)擾(rao)(rao)能力(li)(li)不強，其(qi)抗(kang)干(gan)(gan)擾(rao)(rao)能力(li)(li)主要取決于射(she)頻(pin)(pin)(pin)(pin)(pin)功率(lv)(lv)的(de)(de)(de)(de)(de)大(da)小(xiao)。分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術的(de)(de)(de)(de)(de)功率(lv)(lv)一般是50dB在(zai)(zai)50dB左右時，其(qi)抗(kang)干(gan)(gan)擾(rao)(rao)能力(li)(li)強。但由于分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)的(de)(de)(de)(de)(de)干(gan)(gan)擾(rao)(rao)與(yu)噪(zao)(zao)聲(sheng)(主要是周(zhou)邊噪(zao)(zao)聲(sheng))具有(you)很強的(de)(de)(de)(de)(de)互通性，當分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)發(fa)射(she)的(de)(de)(de)(de)(de)信(xin)號(hao)超過(guo)50dB時，其(qi)抗(kang)千擾(rao)(rao)能力(li)(li)就會(hui)減弱。另外(wai)，在(zai)(zai)一些有(you)噪(zao)(zao)音的(de)(de)(de)(de)(de)環境中使(shi)用分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術，會(hui)使(shi)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)信(xin)號(hao)無法到(dao)達發(fa)射(she)端的(de)(de)(de)(de)(de)接收(shou)機(ji)或者造成(cheng)發(fa)射(she)端信(xin)號(hao)與(yu)接收(shou)端信(xin)號(hao)的(de)(de)(de)(de)(de)糟合(he)而造成(cheng)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)或干(gan)(gan)擾(rao)(rao)(例(li)如(ru)(ru)(ru)在(zai)(zai)使(shi)用室外(wai)電(dian)話時) 。而采(cai)(cai)用分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術的(de)(de)(de)(de)(de)無線對(dui)講系統(tong)由于發(fa)射(she)功率(lv)(lv)小(xiao)，分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)后的(de)(de)(de)(de)(de)信(xin)號(hao)強度比有(you)線對(dui)講系統(tong)高很多(在(zai)(zai)實際使(shi)用中分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)設備一般可以將系統(tong)信(xin)號(hao)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)到(dao)50dB以上),信(xin)號(hao)不受干(gan)(gan)擾(rao)(rao)。如(ru)(ru)(ru)果采(cai)(cai)用分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術，需要在(zai)(zai)較大(da)的(de)(de)(de)(de)(de)回波功率(lv)(lv)下才能實現信(xin)號(hao)的(de)(de)(de)(de)(de)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)工作(zuo)(如(ru)(ru)(ru)分(fen)(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)器(qi)發(fa)射(she)信(xin)號(hao)與(yu)接收(shou)信(xin)號(hao)重疊時產(chan)生的(de)(de)(de)(de)(de)千擾(rao)(rao))和發(fa)送信(xin)號(hao)強度降(jiang)(jiang)低(同頻(pin)(pin)(pin)(pin)(pin)帶(dai)內的(de)(de)(de)(de)(de)兩只天線對(dui)同一信(xin)道傳輸的(de)(de)(de)(de)(de)信(xin)號(hao)強度基本一致);如(ru)(ru)(ru)果采(cai)(cai)用混(hun)響技(ji)術，則可以實現對(dui)無線信(xin)號(hao)干(gan)(gan)擾(rao)(rao)的(de)(de)(de)(de)(de)抑制或降(jiang)(jiang)低。