由于在戶(hu)外(wai)、室內等(deng)區域，無(wu)(wu)(wu)線(xian)對(dui)(dui)講系(xi)統(tong)(tong)的(de)信(xin)號(hao)強度較弱(ruo)，而(er)且采用(yong)(yong)頻(pin)率調制技術(shu)（如 MHZ、 NMR、 BSI等(deng)）產生的(de)信(xin)號(hao)傳輸時(shi)延大(da)，傳輸距(ju)離遠。因此有(you)線(xian)對(dui)(dui)講系(xi)統(tong)(tong)不適合(he)在戶(hu)外(wai)環境使用(yong)(yong)，特(te)別是(shi)在冬天(tian)及低風速季節使用(yong)(yong)。雖然無(wu)(wu)(wu)線(xian)對(dui)(dui)講系(xi)統(tong)(tong)也有(you)著(zhu)不錯(cuo)的(de)效果。但由于系(xi)統(tong)(tong)工(gong)作時(shi)會有(you)一(yi)定(ding)的(de)干擾，使對(dui)(dui)講效果下降，另外(wai)在信(xin)號(hao)較弱(ruo)時(shi)對(dui)(dui)用(yong)(yong)戶(hu)語音產生了影響。特(te)別是(shi)在人員復雜、通(tong)信(xin)距(ju)離較短或需要(yao)較長時(shi)間使用(yong)(yong)時(shi)。因此，更(geng)需要(yao)有(you)一(yi)個可靠的(de)無(wu)(wu)(wu)線(xian)對(dui)(dui)講系(xi)統(tong)(tong)提供與有(you)線(xian)對(dui)(dui)講系(xi)統(tong)(tong)一(yi)樣的(de)語音信(xin)息(xi)與控(kong)制。無(wu)(wu)(wu)線(xian)對(dui)(dui)講系(xi)統(tong)(tong)具(ju)有(you)很高(gao)的(de)靈活性，它能夠滿(man)足現場中所有(you)環境使用(yong)(yong)需求并能隨時(shi)切換（如在野外(wai)、戶(hu)外(wai)電話等(deng)),用(yong)(yong)戶(hu)可以在任何地點(dian)使用(yong)(yong)、隨時(shi)、隨地進行通(tong)訊(xun)。使用(yong)(yong)方(fang)便、節省成(cheng)本、節約費用(yong)(yong)。下面我們來(lai)了解一(yi)下無(wu)(wu)(wu)線(xian)對(dui)(dui)講系(xi)統(tong)(tong)它主要(yao)是(shi)什么優點(dian)？

1.性能穩定，可靠性高

在(zai)相同無(wu)線(xian)傳(chuan)輸距離下，無(wu)線(xian)傳(chuan)輸信(xin)(xin)(xin)號(hao)(hao)(hao)更穩(wen)定(ding)(ding)由于使(shi)用(yong)了功率(lv)(lv)放大(da)器來對(dui)(dui)無(wu)線(xian)信(xin)(xin)(xin)號(hao)(hao)(hao)進行(xing)壓縮和(he)(he)放大(da)，使(shi)無(wu)線(xian)信(xin)(xin)(xin)號(hao)(hao)(hao)更加穩(wen)定(ding)(ding)可靠。無(wu)線(xian)信(xin)(xin)(xin)號(hao)(hao)(hao)在(zai)弱電磁環(huan)境下也(ye)能(neng)(neng)(neng)保(bao)持較(jiao)好(hao)的(de)(de)(de)(de)性(xing)(xing)能(neng)(neng)(neng)。無(wu)線(xian)對(dui)(dui)講系(xi)(xi)統(tong)(tong)(tong)具有發(fa)(fa)射(she)功率(lv)(lv)小(xiao)、抗千擾能(neng)(neng)(neng)力強(qiang)(與(yu)有線(xian)對(dui)(dui)講系(xi)(xi)統(tong)(tong)(tong)比較(jiao))和(he)(he)抗電磁干擾能(neng)(neng)(neng)力強(qiang)(與(yu)有線(xian)對(dui)(dui)講系(xi)(xi)統(tong)(tong)(tong)比較(jiao))的(de)(de)(de)(de)特點。無(wu)線(xian)對(dui)(dui)講系(xi)(xi)統(tong)(tong)(tong)發(fa)(fa)射(she)信(xin)(xin)(xin)號(hao)(hao)(hao)在(zai)發(fa)(fa)射(she)前(qian)和(he)(he)發(fa)(fa)射(she)后均能(neng)(neng)(neng)保(bao)持良好(hao)的(de)(de)(de)(de)性(xing)(xing)能(neng)(neng)(neng)，使(shi)用(yong)過程中，發(fa)(fa)射(she)信(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接收(shou)信(xin)(xin)(xin)號(hao)(hao)(hao)完全不受任(ren)何千擾，可保(bao)持很好(hao)的(de)(de)(de)(de)穩(wen)定(ding)(ding)性(xing)(xing)，具有良好(hao)的(de)(de)(de)(de)抗千擾性(xing)(xing)和(he)(he)抗低頻干擾能(neng)(neng)(neng)力，即使(shi)在(zai)惡劣的(de)(de)(de)(de)環(huan)境下也(ye)能(neng)(neng)(neng)保(bao)持較(jiao)好(hao)的(de)(de)(de)(de)性(xing)(xing)能(neng)(neng)(neng)。因此(ci)無(wu)線(xian)系(xi)(xi)統(tong)(tong)(tong)有較(jiao)高的(de)(de)(de)(de)可靠性(xing)(xing)。

2.功耗小(xiao)、不(bu)受天(tian)氣、濕度(du)的影(ying)響

無(wu)線(xian)對(dui)講(jiang)系統(tong)在不(bu)同的(de)環(huan)(huan)境(jing)中，無(wu)線(xian)通(tong)信(xin)設(she)備(bei)和有(you)線(xian)通(tong)信(xin)設(she)備(bei)一(yi)(yi)樣都要進行(xing)電能(neng)的(de)消耗。當環(huan)(huan)境(jing)溫(wen)度在-40°C以(yi)下時(shi)，無(wu)線(xian)通(tong)信(xin)設(she)備(bei)需(xu)要每天工(gong)(gong)作(zuo)8小時(shi)左(zuo)(zuo)(zuo)右(you);當環(huan)(huan)境(jing)溫(wen)度為-20°C時(shi)，每天工(gong)(gong)作(zuo)8小時(shi)左(zuo)(zuo)(zuo)右(you);當環(huan)(huan)境(jing)溫(wen)度為-30°C時(shi)，每天工(gong)(gong)作(zuo)4小時(shi)左(zuo)(zuo)(zuo)右(you)。目(mu)前市(shi)場上(shang)常見的(de)無(wu)線(xian)對(dui)講(jiang)系統(tong)有(you)兩(liang)(liang)種電源(yuan)輸(shu)入方(fang)式，一(yi)(yi)種是電源(yuan)輸(shu)入，另一(yi)(yi)種是電源(yuan)輸(shu)出(chu)。從這兩(liang)(liang)種方(fang)式對(dui)系統(tong)的(de)功(gong)耗來看，電源(yuan)輸(shu)入方(fang)式的(de)功(gong)耗更大一(yi)(yi)些，但是功(gong)耗很小。并且設(she)備(bei)的(de)工(gong)(gong)作(zuo)環(huan)(huan)境(jing)不(bu)同，對(dui)電池的(de)需(xu)求(qiu)量(liang)也(ye)不(bu)同，所以(yi)功(gong)耗也(ye)不(bu)同。

3信號不受干擾

在(zai)(zai)一(yi)(yi)些有(you)干(gan)(gan)擾(rao)(rao)的(de)(de)(de)(de)(de)地方(fang)(fang)，例(li)如(ru)(ru)野外(wai)、機(ji)場、工(gong)廠(chang)等，一(yi)(yi)般采用(yong)分(fen)(fen)(fen)頻(pin)(pin)方(fang)(fang)式。分(fen)(fen)(fen)頻(pin)(pin)方(fang)(fang)式的(de)(de)(de)(de)(de)抗(kang)干(gan)(gan)擾(rao)(rao)能(neng)力不強(qiang)，其(qi)抗(kang)干(gan)(gan)擾(rao)(rao)能(neng)力主(zhu)要(yao)取決(jue)于射頻(pin)(pin)功率(lv)的(de)(de)(de)(de)(de)大小。分(fen)(fen)(fen)頻(pin)(pin)技(ji)術(shu)(shu)的(de)(de)(de)(de)(de)功率(lv)一(yi)(yi)般是50dB在(zai)(zai)50dB左右(you)時(shi)，其(qi)抗(kang)干(gan)(gan)擾(rao)(rao)能(neng)力強(qiang)。但由(you)于分(fen)(fen)(fen)頻(pin)(pin)的(de)(de)(de)(de)(de)干(gan)(gan)擾(rao)(rao)與(yu)噪聲(主(zhu)要(yao)是周邊噪聲)具有(you)很強(qiang)的(de)(de)(de)(de)(de)互(hu)通性，當(dang)分(fen)(fen)(fen)頻(pin)(pin)發射的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)超過50dB時(shi)，其(qi)抗(kang)千(qian)(qian)擾(rao)(rao)能(neng)力就會減(jian)弱。另外(wai)，在(zai)(zai)一(yi)(yi)些有(you)噪音(yin)的(de)(de)(de)(de)(de)環(huan)境中(zhong)使(shi)用(yong)分(fen)(fen)(fen)頻(pin)(pin)技(ji)術(shu)(shu)，會使(shi)分(fen)(fen)(fen)頻(pin)(pin)信(xin)(xin)(xin)(xin)號(hao)(hao)無法到達(da)發射端的(de)(de)(de)(de)(de)接收(shou)(shou)機(ji)或(huo)者造成發射端信(xin)(xin)(xin)(xin)號(hao)(hao)與(yu)接收(shou)(shou)端信(xin)(xin)(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)(de)糟(zao)合而造成分(fen)(fen)(fen)頻(pin)(pin)或(huo)干(gan)(gan)擾(rao)(rao)(例(li)如(ru)(ru)在(zai)(zai)使(shi)用(yong)室外(wai)電話時(shi)) 。而采用(yong)分(fen)(fen)(fen)頻(pin)(pin)技(ji)術(shu)(shu)的(de)(de)(de)(de)(de)無線對(dui)講系統由(you)于發射功率(lv)小，分(fen)(fen)(fen)頻(pin)(pin)后(hou)的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)強(qiang)度比有(you)線對(dui)講系統高(gao)很多(在(zai)(zai)實際使(shi)用(yong)中(zhong)分(fen)(fen)(fen)頻(pin)(pin)設備一(yi)(yi)般可(ke)(ke)以將系統信(xin)(xin)(xin)(xin)號(hao)(hao)分(fen)(fen)(fen)頻(pin)(pin)到50dB以上),信(xin)(xin)(xin)(xin)號(hao)(hao)不受干(gan)(gan)擾(rao)(rao)。如(ru)(ru)果(guo)采用(yong)分(fen)(fen)(fen)頻(pin)(pin)技(ji)術(shu)(shu)，需要(yao)在(zai)(zai)較(jiao)大的(de)(de)(de)(de)(de)回(hui)波(bo)功率(lv)下才能(neng)實現(xian)信(xin)(xin)(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)(de)分(fen)(fen)(fen)頻(pin)(pin)工(gong)作(如(ru)(ru)分(fen)(fen)(fen)頻(pin)(pin)器發射信(xin)(xin)(xin)(xin)號(hao)(hao)與(yu)接收(shou)(shou)信(xin)(xin)(xin)(xin)號(hao)(hao)重疊時(shi)產生(sheng)的(de)(de)(de)(de)(de)千(qian)(qian)擾(rao)(rao))和發送信(xin)(xin)(xin)(xin)號(hao)(hao)強(qiang)度降低(同頻(pin)(pin)帶內的(de)(de)(de)(de)(de)兩(liang)只天線對(dui)同一(yi)(yi)信(xin)(xin)(xin)(xin)道(dao)傳輸的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)強(qiang)度基本一(yi)(yi)致);如(ru)(ru)果(guo)采用(yong)混(hun)響技(ji)術(shu)(shu)，則可(ke)(ke)以實現(xian)對(dui)無線信(xin)(xin)(xin)(xin)號(hao)(hao)干(gan)(gan)擾(rao)(rao)的(de)(de)(de)(de)(de)抑制或(huo)降低。