由于(yu)在(zai)(zai)戶外、室(shi)內等區域，無線(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)系(xi)(xi)統(tong)的(de)信號(hao)(hao)強度較弱(ruo)，而且采用(yong)(yong)頻率調制(zhi)技術(shu)（如 MHZ、 NMR、 BSI等）產生(sheng)的(de)信號(hao)(hao)傳輸時(shi)延大，傳輸距離遠。因此(ci)有(you)(you)線(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)系(xi)(xi)統(tong)不適合在(zai)(zai)戶外環境使(shi)用(yong)(yong)，特別(bie)是(shi)在(zai)(zai)冬天及低風速季節(jie)使(shi)用(yong)(yong)。雖然無線(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)系(xi)(xi)統(tong)也有(you)(you)著(zhu)不錯的(de)效果。但(dan)由于(yu)系(xi)(xi)統(tong)工作時(shi)會有(you)(you)一(yi)定的(de)干(gan)擾，使(shi)對(dui)(dui)(dui)(dui)講(jiang)效果下(xia)降(jiang)，另外在(zai)(zai)信號(hao)(hao)較弱(ruo)時(shi)對(dui)(dui)(dui)(dui)用(yong)(yong)戶語(yu)音(yin)產生(sheng)了影(ying)響。特別(bie)是(shi)在(zai)(zai)人員復雜(za)、通信距離較短或需(xu)要較長(chang)時(shi)間使(shi)用(yong)(yong)時(shi)。因此(ci)，更需(xu)要有(you)(you)一(yi)個可靠的(de)無線(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)系(xi)(xi)統(tong)提供與(yu)(yu)有(you)(you)線(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)系(xi)(xi)統(tong)一(yi)樣的(de)語(yu)音(yin)信息與(yu)(yu)控(kong)制(zhi)。無線(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)系(xi)(xi)統(tong)具有(you)(you)很高的(de)靈活性，它能(neng)夠滿足現(xian)場中所有(you)(you)環境使(shi)用(yong)(yong)需(xu)求并(bing)能(neng)隨時(shi)切換（如在(zai)(zai)野外、戶外電話等),用(yong)(yong)戶可以(yi)在(zai)(zai)任何地(di)點使(shi)用(yong)(yong)、隨時(shi)、隨地(di)進行通訊。使(shi)用(yong)(yong)方便、節(jie)省成本、節(jie)約費用(yong)(yong)。下(xia)面我們來了解一(yi)下(xia)無線(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)系(xi)(xi)統(tong)它主要是(shi)什么優點？

1.性能穩定(ding)，可靠性高

在(zai)相同無(wu)線(xian)(xian)(xian)(xian)(xian)傳輸(shu)距離下(xia)，無(wu)線(xian)(xian)(xian)(xian)(xian)傳輸(shu)信(xin)號(hao)(hao)更穩(wen)定由于使(shi)用了功率放(fang)大器(qi)來對(dui)(dui)無(wu)線(xian)(xian)(xian)(xian)(xian)信(xin)號(hao)(hao)進(jin)行壓(ya)縮(suo)和(he)放(fang)大，使(shi)無(wu)線(xian)(xian)(xian)(xian)(xian)信(xin)號(hao)(hao)更加穩(wen)定可靠(kao)。無(wu)線(xian)(xian)(xian)(xian)(xian)信(xin)號(hao)(hao)在(zai)弱電磁環境(jing)下(xia)也能(neng)(neng)(neng)保(bao)持(chi)較(jiao)好(hao)的(de)(de)性(xing)(xing)能(neng)(neng)(neng)。無(wu)線(xian)(xian)(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)具有(you)發(fa)射功率小(xiao)、抗(kang)千擾能(neng)(neng)(neng)力強(qiang)(與(yu)有(you)線(xian)(xian)(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)比較(jiao))和(he)抗(kang)電磁干擾能(neng)(neng)(neng)力強(qiang)(與(yu)有(you)線(xian)(xian)(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)比較(jiao))的(de)(de)特點。無(wu)線(xian)(xian)(xian)(xian)(xian)對(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)發(fa)射信(xin)號(hao)(hao)在(zai)發(fa)射前和(he)發(fa)射后均能(neng)(neng)(neng)保(bao)持(chi)良好(hao)的(de)(de)性(xing)(xing)能(neng)(neng)(neng)，使(shi)用過程中，發(fa)射信(xin)號(hao)(hao)與(yu)接(jie)收信(xin)號(hao)(hao)完全(quan)不受任(ren)何千擾，可保(bao)持(chi)很好(hao)的(de)(de)穩(wen)定性(xing)(xing)，具有(you)良好(hao)的(de)(de)抗(kang)千擾性(xing)(xing)和(he)抗(kang)低(di)頻干擾能(neng)(neng)(neng)力，即使(shi)在(zai)惡劣(lie)的(de)(de)環境(jing)下(xia)也能(neng)(neng)(neng)保(bao)持(chi)較(jiao)好(hao)的(de)(de)性(xing)(xing)能(neng)(neng)(neng)。因此無(wu)線(xian)(xian)(xian)(xian)(xian)系(xi)(xi)統(tong)(tong)有(you)較(jiao)高的(de)(de)可靠(kao)性(xing)(xing)。

2.功耗小(xiao)、不受天(tian)氣、濕度(du)的影響

無線(xian)對(dui)講(jiang)系(xi)(xi)統(tong)在不(bu)同(tong)(tong)的(de)(de)(de)環境中(zhong)，無線(xian)通(tong)信(xin)設備(bei)和有線(xian)通(tong)信(xin)設備(bei)一(yi)(yi)樣都要進行電能的(de)(de)(de)消耗(hao)。當環境溫度在-40°C以下時(shi)(shi)(shi)，無線(xian)通(tong)信(xin)設備(bei)需要每(mei)(mei)天工(gong)作(zuo)(zuo)8小(xiao)時(shi)(shi)(shi)左(zuo)右;當環境溫度為-20°C時(shi)(shi)(shi)，每(mei)(mei)天工(gong)作(zuo)(zuo)8小(xiao)時(shi)(shi)(shi)左(zuo)右;當環境溫度為-30°C時(shi)(shi)(shi)，每(mei)(mei)天工(gong)作(zuo)(zuo)4小(xiao)時(shi)(shi)(shi)左(zuo)右。目(mu)前市(shi)場上(shang)常(chang)見的(de)(de)(de)無線(xian)對(dui)講(jiang)系(xi)(xi)統(tong)有兩(liang)種(zhong)(zhong)電源輸(shu)入(ru)方式，一(yi)(yi)種(zhong)(zhong)是(shi)電源輸(shu)入(ru)，另一(yi)(yi)種(zhong)(zhong)是(shi)電源輸(shu)出。從這兩(liang)種(zhong)(zhong)方式對(dui)系(xi)(xi)統(tong)的(de)(de)(de)功(gong)耗(hao)來看，電源輸(shu)入(ru)方式的(de)(de)(de)功(gong)耗(hao)更(geng)大一(yi)(yi)些，但是(shi)功(gong)耗(hao)很小(xiao)。并且設備(bei)的(de)(de)(de)工(gong)作(zuo)(zuo)環境不(bu)同(tong)(tong)，對(dui)電池(chi)的(de)(de)(de)需求(qiu)量(liang)也不(bu)同(tong)(tong)，所以功(gong)耗(hao)也不(bu)同(tong)(tong)。

3信號不受干擾

在一些(xie)有(you)(you)干(gan)(gan)擾的(de)(de)(de)(de)(de)地方(fang)，例(li)如(ru)野外、機場、工(gong)廠等(deng)，一般采(cai)用分(fen)(fen)頻(pin)(pin)方(fang)式。分(fen)(fen)頻(pin)(pin)方(fang)式的(de)(de)(de)(de)(de)抗(kang)(kang)干(gan)(gan)擾能(neng)力不強，其(qi)(qi)抗(kang)(kang)干(gan)(gan)擾能(neng)力主(zhu)(zhu)要取決于射(she)頻(pin)(pin)功(gong)(gong)率(lv)的(de)(de)(de)(de)(de)大小(xiao)。分(fen)(fen)頻(pin)(pin)技術(shu)(shu)的(de)(de)(de)(de)(de)功(gong)(gong)率(lv)一般是(shi)50dB在50dB左右時，其(qi)(qi)抗(kang)(kang)干(gan)(gan)擾能(neng)力強。但(dan)由(you)于分(fen)(fen)頻(pin)(pin)的(de)(de)(de)(de)(de)干(gan)(gan)擾與(yu)噪(zao)聲(主(zhu)(zhu)要是(shi)周邊噪(zao)聲)具有(you)(you)很(hen)強的(de)(de)(de)(de)(de)互通性，當(dang)分(fen)(fen)頻(pin)(pin)發(fa)(fa)射(she)的(de)(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)超過50dB時，其(qi)(qi)抗(kang)(kang)千擾能(neng)力就會(hui)減弱(ruo)。另外，在一些(xie)有(you)(you)噪(zao)音的(de)(de)(de)(de)(de)環境中使用分(fen)(fen)頻(pin)(pin)技術(shu)(shu)，會(hui)使分(fen)(fen)頻(pin)(pin)信(xin)(xin)(xin)號(hao)(hao)無法到達發(fa)(fa)射(she)端的(de)(de)(de)(de)(de)接(jie)(jie)收(shou)機或者(zhe)造(zao)成(cheng)發(fa)(fa)射(she)端信(xin)(xin)(xin)號(hao)(hao)與(yu)接(jie)(jie)收(shou)端信(xin)(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)(de)糟合而(er)造(zao)成(cheng)分(fen)(fen)頻(pin)(pin)或干(gan)(gan)擾(例(li)如(ru)在使用室外電話時) 。而(er)采(cai)用分(fen)(fen)頻(pin)(pin)技術(shu)(shu)的(de)(de)(de)(de)(de)無線(xian)對(dui)講(jiang)系(xi)統(tong)由(you)于發(fa)(fa)射(she)功(gong)(gong)率(lv)小(xiao)，分(fen)(fen)頻(pin)(pin)后的(de)(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)強度比有(you)(you)線(xian)對(dui)講(jiang)系(xi)統(tong)高很(hen)多(duo)(在實(shi)際使用中分(fen)(fen)頻(pin)(pin)設備一般可以將系(xi)統(tong)信(xin)(xin)(xin)號(hao)(hao)分(fen)(fen)頻(pin)(pin)到50dB以上),信(xin)(xin)(xin)號(hao)(hao)不受干(gan)(gan)擾。如(ru)果采(cai)用分(fen)(fen)頻(pin)(pin)技術(shu)(shu)，需要在較大的(de)(de)(de)(de)(de)回波功(gong)(gong)率(lv)下才能(neng)實(shi)現信(xin)(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)(de)分(fen)(fen)頻(pin)(pin)工(gong)作(zuo)(如(ru)分(fen)(fen)頻(pin)(pin)器發(fa)(fa)射(she)信(xin)(xin)(xin)號(hao)(hao)與(yu)接(jie)(jie)收(shou)信(xin)(xin)(xin)號(hao)(hao)重疊時產生(sheng)的(de)(de)(de)(de)(de)千擾)和發(fa)(fa)送(song)信(xin)(xin)(xin)號(hao)(hao)強度降(jiang)低(同頻(pin)(pin)帶內的(de)(de)(de)(de)(de)兩只(zhi)天線(xian)對(dui)同一信(xin)(xin)(xin)道傳輸的(de)(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)強度基本一致);如(ru)果采(cai)用混響技術(shu)(shu)，則可以實(shi)現對(dui)無線(xian)信(xin)(xin)(xin)號(hao)(hao)干(gan)(gan)擾的(de)(de)(de)(de)(de)抑制或降(jiang)低。