由于(yu)在(zai)(zai)(zai)戶(hu)外(wai)(wai)、室內等區域，無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)系(xi)統(tong)(tong)(tong)的(de)信號(hao)(hao)強度較(jiao)弱，而(er)且采用(yong)(yong)(yong)(yong)(yong)頻率(lv)調制技術（如 MHZ、 NMR、 BSI等）產生的(de)信號(hao)(hao)傳輸時(shi)延大，傳輸距離遠。因(yin)此有線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)系(xi)統(tong)(tong)(tong)不(bu)適(shi)合在(zai)(zai)(zai)戶(hu)外(wai)(wai)環(huan)境使用(yong)(yong)(yong)(yong)(yong)，特(te)別(bie)是(shi)在(zai)(zai)(zai)冬天及(ji)低風速(su)季(ji)節使用(yong)(yong)(yong)(yong)(yong)。雖然(ran)無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)系(xi)統(tong)(tong)(tong)也有著(zhu)不(bu)錯的(de)效果。但由于(yu)系(xi)統(tong)(tong)(tong)工(gong)作時(shi)會有一(yi)定的(de)干擾，使對(dui)(dui)(dui)講(jiang)效果下(xia)(xia)降，另外(wai)(wai)在(zai)(zai)(zai)信號(hao)(hao)較(jiao)弱時(shi)對(dui)(dui)(dui)用(yong)(yong)(yong)(yong)(yong)戶(hu)語(yu)音產生了影響。特(te)別(bie)是(shi)在(zai)(zai)(zai)人員復雜(za)、通(tong)信距離較(jiao)短或需要(yao)較(jiao)長(chang)時(shi)間使用(yong)(yong)(yong)(yong)(yong)時(shi)。因(yin)此，更需要(yao)有一(yi)個可靠的(de)無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)系(xi)統(tong)(tong)(tong)提供(gong)與(yu)有線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)系(xi)統(tong)(tong)(tong)一(yi)樣的(de)語(yu)音信息與(yu)控制。無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)系(xi)統(tong)(tong)(tong)具有很(hen)高的(de)靈活性，它能(neng)夠滿足現場(chang)中所有環(huan)境使用(yong)(yong)(yong)(yong)(yong)需求并能(neng)隨時(shi)切換（如在(zai)(zai)(zai)野外(wai)(wai)、戶(hu)外(wai)(wai)電話等),用(yong)(yong)(yong)(yong)(yong)戶(hu)可以在(zai)(zai)(zai)任(ren)何地點(dian)使用(yong)(yong)(yong)(yong)(yong)、隨時(shi)、隨地進行通(tong)訊(xun)。使用(yong)(yong)(yong)(yong)(yong)方便、節省成本、節約費用(yong)(yong)(yong)(yong)(yong)。下(xia)(xia)面我們(men)來了解一(yi)下(xia)(xia)無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)系(xi)統(tong)(tong)(tong)它主要(yao)是(shi)什么優(you)點(dian)？

1.性(xing)能穩定(ding)，可靠性(xing)高

在(zai)相同無(wu)(wu)線(xian)傳輸距離下，無(wu)(wu)線(xian)傳輸信(xin)(xin)號更穩(wen)定(ding)由于(yu)使(shi)(shi)用(yong)了功(gong)率(lv)放(fang)(fang)大器來對無(wu)(wu)線(xian)信(xin)(xin)號進(jin)行壓縮和(he)(he)(he)放(fang)(fang)大，使(shi)(shi)無(wu)(wu)線(xian)信(xin)(xin)號更加(jia)穩(wen)定(ding)可靠。無(wu)(wu)線(xian)信(xin)(xin)號在(zai)弱電磁環境(jing)下也能(neng)保(bao)持(chi)(chi)較(jiao)好(hao)的(de)(de)性能(neng)。無(wu)(wu)線(xian)對講(jiang)系(xi)統(tong)具有發(fa)射(she)功(gong)率(lv)小、抗千(qian)擾(rao)(rao)能(neng)力強(與(yu)有線(xian)對講(jiang)系(xi)統(tong)比較(jiao))和(he)(he)(he)抗電磁干擾(rao)(rao)能(neng)力強(與(yu)有線(xian)對講(jiang)系(xi)統(tong)比較(jiao))的(de)(de)特點。無(wu)(wu)線(xian)對講(jiang)系(xi)統(tong)發(fa)射(she)信(xin)(xin)號在(zai)發(fa)射(she)前和(he)(he)(he)發(fa)射(she)后均能(neng)保(bao)持(chi)(chi)良好(hao)的(de)(de)性能(neng)，使(shi)(shi)用(yong)過(guo)程中，發(fa)射(she)信(xin)(xin)號與(yu)接收信(xin)(xin)號完全不受(shou)任(ren)何千(qian)擾(rao)(rao)，可保(bao)持(chi)(chi)很好(hao)的(de)(de)穩(wen)定(ding)性，具有良好(hao)的(de)(de)抗千(qian)擾(rao)(rao)性和(he)(he)(he)抗低頻干擾(rao)(rao)能(neng)力，即使(shi)(shi)在(zai)惡劣(lie)的(de)(de)環境(jing)下也能(neng)保(bao)持(chi)(chi)較(jiao)好(hao)的(de)(de)性能(neng)。因此無(wu)(wu)線(xian)系(xi)統(tong)有較(jiao)高的(de)(de)可靠性。

2.功耗小、不受天氣、濕(shi)度的影響(xiang)

無(wu)線(xian)(xian)對(dui)講(jiang)系(xi)統(tong)(tong)在不(bu)(bu)同的(de)環(huan)(huan)境(jing)(jing)中，無(wu)線(xian)(xian)通(tong)信設備(bei)(bei)和有(you)線(xian)(xian)通(tong)信設備(bei)(bei)一(yi)(yi)樣(yang)都要進行電(dian)(dian)能的(de)消耗。當(dang)環(huan)(huan)境(jing)(jing)溫度在-40°C以(yi)下時(shi)(shi)，無(wu)線(xian)(xian)通(tong)信設備(bei)(bei)需要每天工(gong)作(zuo)(zuo)8小(xiao)時(shi)(shi)左右;當(dang)環(huan)(huan)境(jing)(jing)溫度為(wei)-20°C時(shi)(shi)，每天工(gong)作(zuo)(zuo)8小(xiao)時(shi)(shi)左右;當(dang)環(huan)(huan)境(jing)(jing)溫度為(wei)-30°C時(shi)(shi)，每天工(gong)作(zuo)(zuo)4小(xiao)時(shi)(shi)左右。目前市場(chang)上常見的(de)無(wu)線(xian)(xian)對(dui)講(jiang)系(xi)統(tong)(tong)有(you)兩種電(dian)(dian)源輸(shu)入(ru)方式(shi)(shi)，一(yi)(yi)種是電(dian)(dian)源輸(shu)入(ru)，另一(yi)(yi)種是電(dian)(dian)源輸(shu)出。從這兩種方式(shi)(shi)對(dui)系(xi)統(tong)(tong)的(de)功(gong)耗來(lai)看，電(dian)(dian)源輸(shu)入(ru)方式(shi)(shi)的(de)功(gong)耗更大一(yi)(yi)些，但是功(gong)耗很小(xiao)。并(bing)且(qie)設備(bei)(bei)的(de)工(gong)作(zuo)(zuo)環(huan)(huan)境(jing)(jing)不(bu)(bu)同，對(dui)電(dian)(dian)池的(de)需求量也不(bu)(bu)同，所以(yi)功(gong)耗也不(bu)(bu)同。

3信號不受干擾

在(zai)(zai)一(yi)些有(you)干(gan)擾(rao)的(de)(de)(de)(de)(de)地方(fang)，例如(ru)(ru)野(ye)外(wai)、機場、工廠等(deng)，一(yi)般(ban)采用分頻(pin)方(fang)式。分頻(pin)方(fang)式的(de)(de)(de)(de)(de)抗(kang)(kang)干(gan)擾(rao)能力(li)不強(qiang)，其抗(kang)(kang)干(gan)擾(rao)能力(li)主(zhu)(zhu)要取決于射(she)頻(pin)功(gong)率(lv)的(de)(de)(de)(de)(de)大小(xiao)。分頻(pin)技(ji)(ji)術的(de)(de)(de)(de)(de)功(gong)率(lv)一(yi)般(ban)是(shi)50dB在(zai)(zai)50dB左右時，其抗(kang)(kang)干(gan)擾(rao)能力(li)強(qiang)。但(dan)由于分頻(pin)的(de)(de)(de)(de)(de)干(gan)擾(rao)與(yu)(yu)噪聲(主(zhu)(zhu)要是(shi)周邊噪聲)具(ju)有(you)很強(qiang)的(de)(de)(de)(de)(de)互通性，當分頻(pin)發射(she)的(de)(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)超過50dB時，其抗(kang)(kang)千擾(rao)能力(li)就會減(jian)弱(ruo)。另外(wai)，在(zai)(zai)一(yi)些有(you)噪音的(de)(de)(de)(de)(de)環境(jing)中(zhong)使(shi)用分頻(pin)技(ji)(ji)術，會使(shi)分頻(pin)信(xin)(xin)號(hao)(hao)無法到達發射(she)端的(de)(de)(de)(de)(de)接(jie)收機或者(zhe)造成發射(she)端信(xin)(xin)號(hao)(hao)與(yu)(yu)接(jie)收端信(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)(de)糟合而(er)造成分頻(pin)或干(gan)擾(rao)(例如(ru)(ru)在(zai)(zai)使(shi)用室外(wai)電話時) 。而(er)采用分頻(pin)技(ji)(ji)術的(de)(de)(de)(de)(de)無線對(dui)講(jiang)系(xi)統由于發射(she)功(gong)率(lv)小(xiao)，分頻(pin)后的(de)(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)強(qiang)度(du)比有(you)線對(dui)講(jiang)系(xi)統高很多(duo)(在(zai)(zai)實(shi)際使(shi)用中(zhong)分頻(pin)設備一(yi)般(ban)可以將系(xi)統信(xin)(xin)號(hao)(hao)分頻(pin)到50dB以上),信(xin)(xin)號(hao)(hao)不受干(gan)擾(rao)。如(ru)(ru)果(guo)采用分頻(pin)技(ji)(ji)術，需(xu)要在(zai)(zai)較大的(de)(de)(de)(de)(de)回波(bo)功(gong)率(lv)下才能實(shi)現(xian)信(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)(de)分頻(pin)工作(zuo)(如(ru)(ru)分頻(pin)器發射(she)信(xin)(xin)號(hao)(hao)與(yu)(yu)接(jie)收信(xin)(xin)號(hao)(hao)重疊時產(chan)生的(de)(de)(de)(de)(de)千擾(rao))和發送信(xin)(xin)號(hao)(hao)強(qiang)度(du)降低(di)(同頻(pin)帶內(nei)的(de)(de)(de)(de)(de)兩(liang)只(zhi)天線對(dui)同一(yi)信(xin)(xin)道傳輸(shu)的(de)(de)(de)(de)(de)信(xin)(xin)號(hao)(hao)強(qiang)度(du)基本一(yi)致);如(ru)(ru)果(guo)采用混響技(ji)(ji)術，則可以實(shi)現(xian)對(dui)無線信(xin)(xin)號(hao)(hao)干(gan)擾(rao)的(de)(de)(de)(de)(de)抑制或降低(di)。