由(you)于(yu)在(zai)(zai)戶(hu)外、室內等區域，無線(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)(tong)的(de)信(xin)號強度(du)較弱，而(er)且采(cai)用(yong)頻(pin)率調制(zhi)技術（如 MHZ、 NMR、 BSI等）產生的(de)信(xin)號傳輸時(shi)(shi)(shi)延大(da)，傳輸距離(li)遠。因此有(you)(you)線(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)(tong)不適合(he)在(zai)(zai)戶(hu)外環境使(shi)(shi)用(yong)，特別是(shi)(shi)(shi)在(zai)(zai)冬天及低(di)風(feng)速季節(jie)使(shi)(shi)用(yong)。雖然無線(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)(tong)也有(you)(you)著不錯(cuo)的(de)效(xiao)果。但(dan)由(you)于(yu)系(xi)統(tong)(tong)(tong)(tong)工作時(shi)(shi)(shi)會(hui)有(you)(you)一定(ding)的(de)干擾，使(shi)(shi)對(dui)(dui)講(jiang)(jiang)效(xiao)果下降，另外在(zai)(zai)信(xin)號較弱時(shi)(shi)(shi)對(dui)(dui)用(yong)戶(hu)語音產生了影響。特別是(shi)(shi)(shi)在(zai)(zai)人(ren)員(yuan)復雜、通信(xin)距離(li)較短(duan)或(huo)需要較長時(shi)(shi)(shi)間(jian)使(shi)(shi)用(yong)時(shi)(shi)(shi)。因此，更需要有(you)(you)一個可靠的(de)無線(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)(tong)提供與有(you)(you)線(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)(tong)一樣的(de)語音信(xin)息與控制(zhi)。無線(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)(tong)具有(you)(you)很高的(de)靈活性，它(ta)能夠滿足現場(chang)中所有(you)(you)環境使(shi)(shi)用(yong)需求并(bing)能隨(sui)(sui)時(shi)(shi)(shi)切換（如在(zai)(zai)野外、戶(hu)外電(dian)話等),用(yong)戶(hu)可以在(zai)(zai)任何地點使(shi)(shi)用(yong)、隨(sui)(sui)時(shi)(shi)(shi)、隨(sui)(sui)地進(jin)行通訊。使(shi)(shi)用(yong)方便(bian)、節(jie)省成本、節(jie)約(yue)費用(yong)。下面我(wo)們來了解(jie)一下無線(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)統(tong)(tong)(tong)(tong)它(ta)主要是(shi)(shi)(shi)什么優點？

1.性能穩定，可靠性高

在(zai)相同無線(xian)(xian)(xian)傳輸(shu)距離(li)下(xia)，無線(xian)(xian)(xian)傳輸(shu)信(xin)(xin)號(hao)更穩(wen)定由(you)于使(shi)用了功(gong)率(lv)放大(da)器(qi)來(lai)對無線(xian)(xian)(xian)信(xin)(xin)號(hao)進(jin)行壓縮和放大(da)，使(shi)無線(xian)(xian)(xian)信(xin)(xin)號(hao)更加穩(wen)定可靠。無線(xian)(xian)(xian)信(xin)(xin)號(hao)在(zai)弱電(dian)磁(ci)環(huan)境下(xia)也能(neng)(neng)(neng)保持較(jiao)好的(de)(de)性(xing)能(neng)(neng)(neng)。無線(xian)(xian)(xian)對講(jiang)系(xi)(xi)統具有(you)(you)發(fa)射功(gong)率(lv)小、抗千(qian)擾(rao)(rao)能(neng)(neng)(neng)力強(與有(you)(you)線(xian)(xian)(xian)對講(jiang)系(xi)(xi)統比(bi)較(jiao))和抗電(dian)磁(ci)干擾(rao)(rao)能(neng)(neng)(neng)力強(與有(you)(you)線(xian)(xian)(xian)對講(jiang)系(xi)(xi)統比(bi)較(jiao))的(de)(de)特點。無線(xian)(xian)(xian)對講(jiang)系(xi)(xi)統發(fa)射信(xin)(xin)號(hao)在(zai)發(fa)射前和發(fa)射后均能(neng)(neng)(neng)保持良好的(de)(de)性(xing)能(neng)(neng)(neng)，使(shi)用過程中，發(fa)射信(xin)(xin)號(hao)與接收信(xin)(xin)號(hao)完(wan)全不受任何千(qian)擾(rao)(rao)，可保持很(hen)好的(de)(de)穩(wen)定性(xing)，具有(you)(you)良好的(de)(de)抗千(qian)擾(rao)(rao)性(xing)和抗低(di)頻干擾(rao)(rao)能(neng)(neng)(neng)力，即使(shi)在(zai)惡劣的(de)(de)環(huan)境下(xia)也能(neng)(neng)(neng)保持較(jiao)好的(de)(de)性(xing)能(neng)(neng)(neng)。因此無線(xian)(xian)(xian)系(xi)(xi)統有(you)(you)較(jiao)高的(de)(de)可靠性(xing)。

2.功耗小、不受天氣、濕度的影響

無(wu)線(xian)(xian)對(dui)講(jiang)(jiang)系統在不(bu)同的(de)環(huan)(huan)境(jing)中，無(wu)線(xian)(xian)通信設備和(he)有(you)線(xian)(xian)通信設備一(yi)樣都要(yao)進(jin)行電(dian)能的(de)消耗。當(dang)環(huan)(huan)境(jing)溫度在-40°C以下時(shi)，無(wu)線(xian)(xian)通信設備需要(yao)每天(tian)工作(zuo)(zuo)(zuo)8小(xiao)時(shi)左(zuo)右;當(dang)環(huan)(huan)境(jing)溫度為(wei)(wei)-20°C時(shi)，每天(tian)工作(zuo)(zuo)(zuo)8小(xiao)時(shi)左(zuo)右;當(dang)環(huan)(huan)境(jing)溫度為(wei)(wei)-30°C時(shi)，每天(tian)工作(zuo)(zuo)(zuo)4小(xiao)時(shi)左(zuo)右。目前市場上常見的(de)無(wu)線(xian)(xian)對(dui)講(jiang)(jiang)系統有(you)兩(liang)種電(dian)源(yuan)輸(shu)(shu)入(ru)方式(shi)，一(yi)種是(shi)電(dian)源(yuan)輸(shu)(shu)入(ru)，另一(yi)種是(shi)電(dian)源(yuan)輸(shu)(shu)出。從這兩(liang)種方式(shi)對(dui)系統的(de)功(gong)耗來看，電(dian)源(yuan)輸(shu)(shu)入(ru)方式(shi)的(de)功(gong)耗更(geng)大一(yi)些，但是(shi)功(gong)耗很小(xiao)。并(bing)且設備的(de)工作(zuo)(zuo)(zuo)環(huan)(huan)境(jing)不(bu)同，對(dui)電(dian)池的(de)需求量也不(bu)同，所以功(gong)耗也不(bu)同。

3信號不受干擾

在(zai)一(yi)些有(you)干(gan)擾的(de)(de)地方(fang)，例如野外、機場、工廠等(deng)，一(yi)般(ban)采用(yong)(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)方(fang)式。分(fen)(fen)頻(pin)(pin)(pin)(pin)方(fang)式的(de)(de)抗(kang)(kang)干(gan)擾能(neng)力不強(qiang)，其(qi)抗(kang)(kang)干(gan)擾能(neng)力主(zhu)要(yao)取決(jue)于(yu)射頻(pin)(pin)(pin)(pin)功率的(de)(de)大(da)小。分(fen)(fen)頻(pin)(pin)(pin)(pin)技術(shu)的(de)(de)功率一(yi)般(ban)是(shi)50dB在(zai)50dB左(zuo)右時(shi)，其(qi)抗(kang)(kang)干(gan)擾能(neng)力強(qiang)。但由于(yu)分(fen)(fen)頻(pin)(pin)(pin)(pin)的(de)(de)干(gan)擾與(yu)噪(zao)(zao)聲(主(zhu)要(yao)是(shi)周邊噪(zao)(zao)聲)具有(you)很強(qiang)的(de)(de)互通性(xing)，當分(fen)(fen)頻(pin)(pin)(pin)(pin)發(fa)射的(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)超過50dB時(shi)，其(qi)抗(kang)(kang)千擾能(neng)力就會(hui)減弱。另外，在(zai)一(yi)些有(you)噪(zao)(zao)音的(de)(de)環境(jing)中使(shi)(shi)用(yong)(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)技術(shu)，會(hui)使(shi)(shi)分(fen)(fen)頻(pin)(pin)(pin)(pin)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)無法到(dao)達(da)發(fa)射端的(de)(de)接收(shou)機或(huo)者造(zao)成(cheng)發(fa)射端信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)與(yu)接收(shou)端信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)的(de)(de)糟(zao)合而造(zao)成(cheng)分(fen)(fen)頻(pin)(pin)(pin)(pin)或(huo)干(gan)擾(例如在(zai)使(shi)(shi)用(yong)(yong)(yong)室外電話(hua)時(shi)) 。而采用(yong)(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)技術(shu)的(de)(de)無線(xian)對講(jiang)(jiang)系(xi)統(tong)(tong)由于(yu)發(fa)射功率小，分(fen)(fen)頻(pin)(pin)(pin)(pin)后的(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)強(qiang)度比有(you)線(xian)對講(jiang)(jiang)系(xi)統(tong)(tong)高很多(在(zai)實(shi)際使(shi)(shi)用(yong)(yong)(yong)中分(fen)(fen)頻(pin)(pin)(pin)(pin)設備一(yi)般(ban)可(ke)以將(jiang)系(xi)統(tong)(tong)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)分(fen)(fen)頻(pin)(pin)(pin)(pin)到(dao)50dB以上),信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)不受干(gan)擾。如果(guo)采用(yong)(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)技術(shu)，需(xu)要(yao)在(zai)較大(da)的(de)(de)回波功率下才能(neng)實(shi)現信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)的(de)(de)分(fen)(fen)頻(pin)(pin)(pin)(pin)工作(如分(fen)(fen)頻(pin)(pin)(pin)(pin)器發(fa)射信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)與(yu)接收(shou)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)重疊時(shi)產生(sheng)的(de)(de)千擾)和發(fa)送(song)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)強(qiang)度降低(同頻(pin)(pin)(pin)(pin)帶內的(de)(de)兩只天(tian)線(xian)對同一(yi)信(xin)(xin)(xin)道傳輸的(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)強(qiang)度基本一(yi)致);如果(guo)采用(yong)(yong)(yong)混響技術(shu)，則可(ke)以實(shi)現對無線(xian)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)干(gan)擾的(de)(de)抑制或(huo)降低。