由于在(zai)戶(hu)外(wai)(wai)、室內等區域(yu)，無(wu)(wu)(wu)線對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)的信號(hao)強度較(jiao)弱，而且采用(yong)(yong)(yong)(yong)頻率(lv)調制技術(shu)（如(ru)(ru) MHZ、 NMR、 BSI等）產生的信號(hao)傳(chuan)輸時(shi)(shi)延大，傳(chuan)輸距(ju)(ju)離(li)遠(yuan)。因此(ci)有線對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)不(bu)適合在(zai)戶(hu)外(wai)(wai)環境(jing)使(shi)(shi)用(yong)(yong)(yong)(yong)，特別是(shi)在(zai)冬天及低風(feng)速季節使(shi)(shi)用(yong)(yong)(yong)(yong)。雖然(ran)無(wu)(wu)(wu)線對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)也有著不(bu)錯的效果(guo)。但由于系(xi)統(tong)(tong)工作時(shi)(shi)會有一(yi)(yi)定的干擾，使(shi)(shi)對(dui)(dui)講(jiang)(jiang)效果(guo)下(xia)降，另外(wai)(wai)在(zai)信號(hao)較(jiao)弱時(shi)(shi)對(dui)(dui)用(yong)(yong)(yong)(yong)戶(hu)語音產生了(le)(le)影響。特別是(shi)在(zai)人(ren)員復雜、通(tong)信距(ju)(ju)離(li)較(jiao)短或需要(yao)較(jiao)長時(shi)(shi)間使(shi)(shi)用(yong)(yong)(yong)(yong)時(shi)(shi)。因此(ci)，更需要(yao)有一(yi)(yi)個可(ke)靠(kao)的無(wu)(wu)(wu)線對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)提供與(yu)有線對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)一(yi)(yi)樣(yang)的語音信息與(yu)控制。無(wu)(wu)(wu)線對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)具(ju)有很高(gao)的靈活性，它能(neng)夠滿足現場中所(suo)有環境(jing)使(shi)(shi)用(yong)(yong)(yong)(yong)需求并能(neng)隨(sui)時(shi)(shi)切換（如(ru)(ru)在(zai)野外(wai)(wai)、戶(hu)外(wai)(wai)電話等),用(yong)(yong)(yong)(yong)戶(hu)可(ke)以在(zai)任(ren)何地(di)點(dian)使(shi)(shi)用(yong)(yong)(yong)(yong)、隨(sui)時(shi)(shi)、隨(sui)地(di)進行通(tong)訊(xun)。使(shi)(shi)用(yong)(yong)(yong)(yong)方便(bian)、節省成(cheng)本(ben)、節約費用(yong)(yong)(yong)(yong)。下(xia)面我們(men)來(lai)了(le)(le)解一(yi)(yi)下(xia)無(wu)(wu)(wu)線對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)它主(zhu)要(yao)是(shi)什么優點(dian)？

1.性能穩定，可靠性高

在(zai)(zai)相同無(wu)(wu)線(xian)(xian)(xian)(xian)傳(chuan)(chuan)輸距(ju)離(li)下(xia)，無(wu)(wu)線(xian)(xian)(xian)(xian)傳(chuan)(chuan)輸信號(hao)(hao)更穩定(ding)(ding)由于使(shi)(shi)用了功率放(fang)大器來對(dui)無(wu)(wu)線(xian)(xian)(xian)(xian)信號(hao)(hao)進行壓縮(suo)和放(fang)大，使(shi)(shi)無(wu)(wu)線(xian)(xian)(xian)(xian)信號(hao)(hao)更加穩定(ding)(ding)可(ke)靠(kao)。無(wu)(wu)線(xian)(xian)(xian)(xian)信號(hao)(hao)在(zai)(zai)弱電磁環(huan)(huan)境下(xia)也(ye)能(neng)保(bao)持較好(hao)的(de)性(xing)能(neng)。無(wu)(wu)線(xian)(xian)(xian)(xian)對(dui)講系統具(ju)有(you)(you)發(fa)射功率小、抗(kang)(kang)千(qian)擾能(neng)力(li)強(與有(you)(you)線(xian)(xian)(xian)(xian)對(dui)講系統比較)和抗(kang)(kang)電磁干擾能(neng)力(li)強(與有(you)(you)線(xian)(xian)(xian)(xian)對(dui)講系統比較)的(de)特點。無(wu)(wu)線(xian)(xian)(xian)(xian)對(dui)講系統發(fa)射信號(hao)(hao)在(zai)(zai)發(fa)射前和發(fa)射后均能(neng)保(bao)持良好(hao)的(de)性(xing)能(neng)，使(shi)(shi)用過(guo)程中，發(fa)射信號(hao)(hao)與接收(shou)信號(hao)(hao)完全不受任(ren)何千(qian)擾，可(ke)保(bao)持很好(hao)的(de)穩定(ding)(ding)性(xing)，具(ju)有(you)(you)良好(hao)的(de)抗(kang)(kang)千(qian)擾性(xing)和抗(kang)(kang)低頻干擾能(neng)力(li)，即使(shi)(shi)在(zai)(zai)惡劣(lie)的(de)環(huan)(huan)境下(xia)也(ye)能(neng)保(bao)持較好(hao)的(de)性(xing)能(neng)。因此無(wu)(wu)線(xian)(xian)(xian)(xian)系統有(you)(you)較高的(de)可(ke)靠(kao)性(xing)。

2.功耗小、不受天(tian)氣、濕度的影響

無線對(dui)講系(xi)(xi)統在不同的(de)(de)(de)環境(jing)(jing)中(zhong)，無線通信(xin)設備(bei)和(he)有線通信(xin)設備(bei)一(yi)樣(yang)都要(yao)進行電(dian)(dian)能(neng)的(de)(de)(de)消耗(hao)。當環境(jing)(jing)溫度在-40°C以下時(shi)，無線通信(xin)設備(bei)需要(yao)每(mei)(mei)天工(gong)(gong)作8小時(shi)左右(you);當環境(jing)(jing)溫度為-20°C時(shi)，每(mei)(mei)天工(gong)(gong)作8小時(shi)左右(you);當環境(jing)(jing)溫度為-30°C時(shi)，每(mei)(mei)天工(gong)(gong)作4小時(shi)左右(you)。目前市場上常見(jian)的(de)(de)(de)無線對(dui)講系(xi)(xi)統有兩種電(dian)(dian)源輸入方式，一(yi)種是電(dian)(dian)源輸入，另一(yi)種是電(dian)(dian)源輸出。從這兩種方式對(dui)系(xi)(xi)統的(de)(de)(de)功(gong)(gong)耗(hao)來(lai)看(kan)，電(dian)(dian)源輸入方式的(de)(de)(de)功(gong)(gong)耗(hao)更大一(yi)些，但是功(gong)(gong)耗(hao)很小。并且(qie)設備(bei)的(de)(de)(de)工(gong)(gong)作環境(jing)(jing)不同，對(dui)電(dian)(dian)池的(de)(de)(de)需求量也不同，所以功(gong)(gong)耗(hao)也不同。

3信號不受干擾

在(zai)(zai)(zai)(zai)一(yi)些有干擾(rao)(rao)(rao)(rao)(rao)的(de)(de)(de)(de)地方，例如(ru)野(ye)外、機場(chang)、工廠等，一(yi)般(ban)采(cai)用分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)方式(shi)(shi)。分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)方式(shi)(shi)的(de)(de)(de)(de)抗(kang)干擾(rao)(rao)(rao)(rao)(rao)能(neng)力不強(qiang)(qiang)(qiang)(qiang)(qiang)，其抗(kang)干擾(rao)(rao)(rao)(rao)(rao)能(neng)力主(zhu)要(yao)取決于(yu)(yu)射(she)(she)(she)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)功(gong)(gong)率(lv)(lv)的(de)(de)(de)(de)大小。分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)技術的(de)(de)(de)(de)功(gong)(gong)率(lv)(lv)一(yi)般(ban)是50dB在(zai)(zai)(zai)(zai)50dB左右(you)時，其抗(kang)干擾(rao)(rao)(rao)(rao)(rao)能(neng)力強(qiang)(qiang)(qiang)(qiang)(qiang)。但由于(yu)(yu)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)的(de)(de)(de)(de)干擾(rao)(rao)(rao)(rao)(rao)與噪(zao)聲(主(zhu)要(yao)是周(zhou)邊噪(zao)聲)具有很(hen)強(qiang)(qiang)(qiang)(qiang)(qiang)的(de)(de)(de)(de)互通性，當(dang)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)發射(she)(she)(she)的(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)超過50dB時，其抗(kang)千擾(rao)(rao)(rao)(rao)(rao)能(neng)力就會減弱(ruo)。另外，在(zai)(zai)(zai)(zai)一(yi)些有噪(zao)音的(de)(de)(de)(de)環境中(zhong)使用分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)技術，會使分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)無(wu)(wu)法到達(da)發射(she)(she)(she)端(duan)的(de)(de)(de)(de)接收(shou)機或者造成(cheng)發射(she)(she)(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)糟合而(er)造成(cheng)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)或干擾(rao)(rao)(rao)(rao)(rao)(例如(ru)在(zai)(zai)(zai)(zai)使用室外電話時) 。而(er)采(cai)用分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)技術的(de)(de)(de)(de)無(wu)(wu)線(xian)(xian)對講系統(tong)由于(yu)(yu)發射(she)(she)(she)功(gong)(gong)率(lv)(lv)小，分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)后(hou)的(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)(qiang)(qiang)(qiang)度(du)(du)比有線(xian)(xian)對講系統(tong)高很(hen)多(duo)(在(zai)(zai)(zai)(zai)實(shi)際使用中(zhong)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)設備一(yi)般(ban)可以(yi)(yi)(yi)將系統(tong)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)到50dB以(yi)(yi)(yi)上(shang)),信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)不受干擾(rao)(rao)(rao)(rao)(rao)。如(ru)果(guo)采(cai)用分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)技術，需(xu)要(yao)在(zai)(zai)(zai)(zai)較大的(de)(de)(de)(de)回波功(gong)(gong)率(lv)(lv)下才能(neng)實(shi)現信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)工作(zuo)(如(ru)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)器(qi)發射(she)(she)(she)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)與接收(shou)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)重疊時產生(sheng)的(de)(de)(de)(de)千擾(rao)(rao)(rao)(rao)(rao))和發送信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)(qiang)(qiang)(qiang)度(du)(du)降低(同頻(pin)(pin)(pin)(pin)(pin)(pin)(pin)帶內的(de)(de)(de)(de)兩只天線(xian)(xian)對同一(yi)信(xin)(xin)(xin)(xin)道(dao)傳輸的(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)(qiang)(qiang)(qiang)度(du)(du)基本一(yi)致);如(ru)果(guo)采(cai)用混響技術，則(ze)可以(yi)(yi)(yi)實(shi)現對無(wu)(wu)線(xian)(xian)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)干擾(rao)(rao)(rao)(rao)(rao)的(de)(de)(de)(de)抑制或降低。