由于在(zai)(zai)(zai)(zai)戶(hu)外(wai)、室內等區域(yu)，無線(xian)(xian)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)系(xi)(xi)統(tong)的(de)信(xin)號強度較(jiao)弱，而且采用(yong)(yong)(yong)頻率調制(zhi)技術(shu)（如 MHZ、 NMR、 BSI等）產生的(de)信(xin)號傳輸(shu)時(shi)(shi)延(yan)大，傳輸(shu)距離(li)遠(yuan)。因(yin)此有(you)(you)(you)線(xian)(xian)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)系(xi)(xi)統(tong)不適合在(zai)(zai)(zai)(zai)戶(hu)外(wai)環(huan)境使(shi)用(yong)(yong)(yong)，特(te)別(bie)是(shi)(shi)在(zai)(zai)(zai)(zai)冬(dong)天及低風(feng)速(su)季節(jie)使(shi)用(yong)(yong)(yong)。雖然無線(xian)(xian)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)系(xi)(xi)統(tong)也有(you)(you)(you)著(zhu)不錯(cuo)的(de)效果(guo)(guo)。但由于系(xi)(xi)統(tong)工作時(shi)(shi)會有(you)(you)(you)一定的(de)干擾，使(shi)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)效果(guo)(guo)下(xia)降，另外(wai)在(zai)(zai)(zai)(zai)信(xin)號較(jiao)弱時(shi)(shi)對(dui)(dui)用(yong)(yong)(yong)戶(hu)語(yu)音(yin)產生了(le)影響。特(te)別(bie)是(shi)(shi)在(zai)(zai)(zai)(zai)人員復雜、通信(xin)距離(li)較(jiao)短或需(xu)(xu)要(yao)(yao)較(jiao)長時(shi)(shi)間(jian)使(shi)用(yong)(yong)(yong)時(shi)(shi)。因(yin)此，更(geng)需(xu)(xu)要(yao)(yao)有(you)(you)(you)一個可靠的(de)無線(xian)(xian)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)系(xi)(xi)統(tong)提(ti)供與(yu)有(you)(you)(you)線(xian)(xian)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)系(xi)(xi)統(tong)一樣的(de)語(yu)音(yin)信(xin)息與(yu)控制(zhi)。無線(xian)(xian)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)系(xi)(xi)統(tong)具有(you)(you)(you)很高(gao)的(de)靈活性，它(ta)能夠滿(man)足現場中所有(you)(you)(you)環(huan)境使(shi)用(yong)(yong)(yong)需(xu)(xu)求并能隨(sui)時(shi)(shi)切換（如在(zai)(zai)(zai)(zai)野外(wai)、戶(hu)外(wai)電話等),用(yong)(yong)(yong)戶(hu)可以在(zai)(zai)(zai)(zai)任何地(di)點(dian)使(shi)用(yong)(yong)(yong)、隨(sui)時(shi)(shi)、隨(sui)地(di)進(jin)行通訊(xun)。使(shi)用(yong)(yong)(yong)方便(bian)、節(jie)省(sheng)成本、節(jie)約費用(yong)(yong)(yong)。下(xia)面我(wo)們來了(le)解一下(xia)無線(xian)(xian)對(dui)(dui)講(jiang)(jiang)(jiang)(jiang)系(xi)(xi)統(tong)它(ta)主要(yao)(yao)是(shi)(shi)什么優點(dian)？

1.性能穩定，可靠性高(gao)

在(zai)相同無(wu)線(xian)(xian)(xian)傳輸距離下，無(wu)線(xian)(xian)(xian)傳輸信(xin)(xin)號(hao)更穩定由于使用了功率放大器(qi)來對(dui)無(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)進行壓縮和(he)放大，使無(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)更加(jia)穩定可靠。無(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)在(zai)弱電(dian)磁環(huan)境下也能(neng)(neng)(neng)(neng)保持(chi)較(jiao)好(hao)的(de)(de)性(xing)(xing)(xing)能(neng)(neng)(neng)(neng)。無(wu)線(xian)(xian)(xian)對(dui)講系(xi)統具(ju)有(you)發(fa)(fa)射(she)(she)功率小(xiao)、抗千(qian)擾(rao)能(neng)(neng)(neng)(neng)力強(與(yu)有(you)線(xian)(xian)(xian)對(dui)講系(xi)統比較(jiao))和(he)抗電(dian)磁干(gan)擾(rao)能(neng)(neng)(neng)(neng)力強(與(yu)有(you)線(xian)(xian)(xian)對(dui)講系(xi)統比較(jiao))的(de)(de)特(te)點。無(wu)線(xian)(xian)(xian)對(dui)講系(xi)統發(fa)(fa)射(she)(she)信(xin)(xin)號(hao)在(zai)發(fa)(fa)射(she)(she)前(qian)和(he)發(fa)(fa)射(she)(she)后均(jun)能(neng)(neng)(neng)(neng)保持(chi)良(liang)好(hao)的(de)(de)性(xing)(xing)(xing)能(neng)(neng)(neng)(neng)，使用過程中，發(fa)(fa)射(she)(she)信(xin)(xin)號(hao)與(yu)接(jie)收信(xin)(xin)號(hao)完全(quan)不(bu)受(shou)任何千(qian)擾(rao)，可保持(chi)很好(hao)的(de)(de)穩定性(xing)(xing)(xing)，具(ju)有(you)良(liang)好(hao)的(de)(de)抗千(qian)擾(rao)性(xing)(xing)(xing)和(he)抗低頻(pin)干(gan)擾(rao)能(neng)(neng)(neng)(neng)力，即使在(zai)惡劣的(de)(de)環(huan)境下也能(neng)(neng)(neng)(neng)保持(chi)較(jiao)好(hao)的(de)(de)性(xing)(xing)(xing)能(neng)(neng)(neng)(neng)。因此無(wu)線(xian)(xian)(xian)系(xi)統有(you)較(jiao)高的(de)(de)可靠性(xing)(xing)(xing)。

2.功耗小、不受天氣(qi)、濕度的影響

無(wu)線(xian)(xian)對(dui)講(jiang)系統(tong)在不(bu)同(tong)(tong)(tong)的環(huan)(huan)(huan)境(jing)中，無(wu)線(xian)(xian)通(tong)信(xin)設備和有線(xian)(xian)通(tong)信(xin)設備一樣都要進行電(dian)(dian)(dian)能的消耗(hao)。當(dang)(dang)(dang)環(huan)(huan)(huan)境(jing)溫度(du)(du)在-40°C以下時(shi)(shi)(shi)，無(wu)線(xian)(xian)通(tong)信(xin)設備需要每(mei)天(tian)工(gong)作8小時(shi)(shi)(shi)左右(you);當(dang)(dang)(dang)環(huan)(huan)(huan)境(jing)溫度(du)(du)為-20°C時(shi)(shi)(shi)，每(mei)天(tian)工(gong)作8小時(shi)(shi)(shi)左右(you);當(dang)(dang)(dang)環(huan)(huan)(huan)境(jing)溫度(du)(du)為-30°C時(shi)(shi)(shi)，每(mei)天(tian)工(gong)作4小時(shi)(shi)(shi)左右(you)。目前市場(chang)上常見的無(wu)線(xian)(xian)對(dui)講(jiang)系統(tong)有兩種電(dian)(dian)(dian)源輸(shu)入(ru)方(fang)式(shi)，一種是(shi)電(dian)(dian)(dian)源輸(shu)入(ru)，另(ling)一種是(shi)電(dian)(dian)(dian)源輸(shu)出。從這兩種方(fang)式(shi)對(dui)系統(tong)的功(gong)耗(hao)來看(kan)，電(dian)(dian)(dian)源輸(shu)入(ru)方(fang)式(shi)的功(gong)耗(hao)更大一些，但是(shi)功(gong)耗(hao)很小。并且(qie)設備的工(gong)作環(huan)(huan)(huan)境(jing)不(bu)同(tong)(tong)(tong)，對(dui)電(dian)(dian)(dian)池的需求量也不(bu)同(tong)(tong)(tong)，所以功(gong)耗(hao)也不(bu)同(tong)(tong)(tong)。

3信號不受干擾

在(zai)一(yi)(yi)(yi)些有(you)干擾(rao)(rao)(rao)(rao)(rao)的(de)(de)(de)(de)(de)(de)(de)地方，例(li)如(ru)(ru)野外(wai)(wai)、機場、工廠等，一(yi)(yi)(yi)般采用(yong)(yong)分(fen)頻(pin)(pin)方式(shi)。分(fen)頻(pin)(pin)方式(shi)的(de)(de)(de)(de)(de)(de)(de)抗干擾(rao)(rao)(rao)(rao)(rao)能(neng)(neng)力(li)不(bu)強(qiang)(qiang)，其(qi)抗干擾(rao)(rao)(rao)(rao)(rao)能(neng)(neng)力(li)主(zhu)要取決于(yu)(yu)射(she)頻(pin)(pin)功(gong)(gong)率(lv)(lv)的(de)(de)(de)(de)(de)(de)(de)大小。分(fen)頻(pin)(pin)技術(shu)的(de)(de)(de)(de)(de)(de)(de)功(gong)(gong)率(lv)(lv)一(yi)(yi)(yi)般是50dB在(zai)50dB左(zuo)右(you)時(shi)，其(qi)抗干擾(rao)(rao)(rao)(rao)(rao)能(neng)(neng)力(li)強(qiang)(qiang)。但由(you)于(yu)(yu)分(fen)頻(pin)(pin)的(de)(de)(de)(de)(de)(de)(de)干擾(rao)(rao)(rao)(rao)(rao)與噪(zao)聲(主(zhu)要是周邊噪(zao)聲)具有(you)很(hen)強(qiang)(qiang)的(de)(de)(de)(de)(de)(de)(de)互通(tong)性，當分(fen)頻(pin)(pin)發射(she)的(de)(de)(de)(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)超過50dB時(shi)，其(qi)抗千(qian)擾(rao)(rao)(rao)(rao)(rao)能(neng)(neng)力(li)就會(hui)減弱(ruo)。另(ling)外(wai)(wai)，在(zai)一(yi)(yi)(yi)些有(you)噪(zao)音(yin)的(de)(de)(de)(de)(de)(de)(de)環(huan)境中(zhong)使(shi)用(yong)(yong)分(fen)頻(pin)(pin)技術(shu)，會(hui)使(shi)分(fen)頻(pin)(pin)信(xin)(xin)(xin)號(hao)(hao)無(wu)法(fa)到(dao)達發射(she)端的(de)(de)(de)(de)(de)(de)(de)接(jie)(jie)收機或者(zhe)造(zao)成發射(she)端信(xin)(xin)(xin)號(hao)(hao)與接(jie)(jie)收端信(xin)(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)(de)(de)(de)糟合而造(zao)成分(fen)頻(pin)(pin)或干擾(rao)(rao)(rao)(rao)(rao)(例(li)如(ru)(ru)在(zai)使(shi)用(yong)(yong)室(shi)外(wai)(wai)電話(hua)時(shi)) 。而采用(yong)(yong)分(fen)頻(pin)(pin)技術(shu)的(de)(de)(de)(de)(de)(de)(de)無(wu)線(xian)對(dui)講(jiang)系統由(you)于(yu)(yu)發射(she)功(gong)(gong)率(lv)(lv)小，分(fen)頻(pin)(pin)后的(de)(de)(de)(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)強(qiang)(qiang)度(du)比有(you)線(xian)對(dui)講(jiang)系統高(gao)很(hen)多(在(zai)實(shi)際使(shi)用(yong)(yong)中(zhong)分(fen)頻(pin)(pin)設備一(yi)(yi)(yi)般可以將系統信(xin)(xin)(xin)號(hao)(hao)分(fen)頻(pin)(pin)到(dao)50dB以上),信(xin)(xin)(xin)號(hao)(hao)不(bu)受干擾(rao)(rao)(rao)(rao)(rao)。如(ru)(ru)果(guo)采用(yong)(yong)分(fen)頻(pin)(pin)技術(shu)，需要在(zai)較大的(de)(de)(de)(de)(de)(de)(de)回波(bo)功(gong)(gong)率(lv)(lv)下才能(neng)(neng)實(shi)現信(xin)(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)(de)(de)(de)分(fen)頻(pin)(pin)工作(如(ru)(ru)分(fen)頻(pin)(pin)器發射(she)信(xin)(xin)(xin)號(hao)(hao)與接(jie)(jie)收信(xin)(xin)(xin)號(hao)(hao)重疊時(shi)產生的(de)(de)(de)(de)(de)(de)(de)千(qian)擾(rao)(rao)(rao)(rao)(rao))和發送(song)信(xin)(xin)(xin)號(hao)(hao)強(qiang)(qiang)度(du)降低(同頻(pin)(pin)帶內的(de)(de)(de)(de)(de)(de)(de)兩只天線(xian)對(dui)同一(yi)(yi)(yi)信(xin)(xin)(xin)道傳輸的(de)(de)(de)(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)強(qiang)(qiang)度(du)基本(ben)一(yi)(yi)(yi)致(zhi));如(ru)(ru)果(guo)采用(yong)(yong)混響技術(shu)，則(ze)可以實(shi)現對(dui)無(wu)線(xian)信(xin)(xin)(xin)號(hao)(hao)干擾(rao)(rao)(rao)(rao)(rao)的(de)(de)(de)(de)(de)(de)(de)抑制或降低。