由于在(zai)(zai)戶(hu)外、室內等區域，無(wu)(wu)線(xian)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)系統(tong)(tong)的(de)(de)信(xin)號強度較弱，而(er)且(qie)采用(yong)(yong)(yong)頻率調制技術（如 MHZ、 NMR、 BSI等）產生(sheng)的(de)(de)信(xin)號傳輸時(shi)(shi)延(yan)大，傳輸距(ju)離(li)遠。因此有線(xian)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)系統(tong)(tong)不適合在(zai)(zai)戶(hu)外環境使(shi)用(yong)(yong)(yong)，特別是(shi)在(zai)(zai)冬天及低風速季節使(shi)用(yong)(yong)(yong)。雖然無(wu)(wu)線(xian)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)系統(tong)(tong)也有著不錯的(de)(de)效(xiao)果(guo)。但由于系統(tong)(tong)工作時(shi)(shi)會(hui)有一定的(de)(de)干擾，使(shi)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)效(xiao)果(guo)下降，另(ling)外在(zai)(zai)信(xin)號較弱時(shi)(shi)對(dui)(dui)(dui)用(yong)(yong)(yong)戶(hu)語(yu)音產生(sheng)了影響。特別是(shi)在(zai)(zai)人員復(fu)雜、通(tong)信(xin)距(ju)離(li)較短或需(xu)要較長(chang)時(shi)(shi)間(jian)使(shi)用(yong)(yong)(yong)時(shi)(shi)。因此，更需(xu)要有一個可靠的(de)(de)無(wu)(wu)線(xian)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)系統(tong)(tong)提(ti)供(gong)與(yu)有線(xian)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)系統(tong)(tong)一樣的(de)(de)語(yu)音信(xin)息與(yu)控制。無(wu)(wu)線(xian)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)系統(tong)(tong)具有很高的(de)(de)靈活性(xing)，它(ta)能夠滿足現場中所有環境使(shi)用(yong)(yong)(yong)需(xu)求并能隨(sui)時(shi)(shi)切換（如在(zai)(zai)野外、戶(hu)外電話等),用(yong)(yong)(yong)戶(hu)可以(yi)在(zai)(zai)任(ren)何地(di)點使(shi)用(yong)(yong)(yong)、隨(sui)時(shi)(shi)、隨(sui)地(di)進行通(tong)訊。使(shi)用(yong)(yong)(yong)方便、節省成(cheng)本、節約費(fei)用(yong)(yong)(yong)。下面(mian)我(wo)們來了解一下無(wu)(wu)線(xian)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)系統(tong)(tong)它(ta)主要是(shi)什么優(you)點？

1.性(xing)能穩(wen)定，可靠性(xing)高(gao)

在相同無(wu)(wu)(wu)線傳(chuan)輸(shu)距離下，無(wu)(wu)(wu)線傳(chuan)輸(shu)信(xin)號(hao)更穩定由于使用(yong)(yong)了(le)功率放(fang)大器來對(dui)無(wu)(wu)(wu)線信(xin)號(hao)進(jin)行壓縮和(he)(he)放(fang)大，使無(wu)(wu)(wu)線信(xin)號(hao)更加穩定可靠(kao)。無(wu)(wu)(wu)線信(xin)號(hao)在弱電磁環境(jing)下也(ye)(ye)能(neng)(neng)保(bao)(bao)持較(jiao)好(hao)的(de)(de)性能(neng)(neng)。無(wu)(wu)(wu)線對(dui)講(jiang)系(xi)(xi)統(tong)具(ju)有(you)發(fa)射(she)(she)功率小、抗千(qian)(qian)擾能(neng)(neng)力(li)強(與(yu)有(you)線對(dui)講(jiang)系(xi)(xi)統(tong)比較(jiao))和(he)(he)抗電磁干(gan)(gan)擾能(neng)(neng)力(li)強(與(yu)有(you)線對(dui)講(jiang)系(xi)(xi)統(tong)比較(jiao))的(de)(de)特點。無(wu)(wu)(wu)線對(dui)講(jiang)系(xi)(xi)統(tong)發(fa)射(she)(she)信(xin)號(hao)在發(fa)射(she)(she)前和(he)(he)發(fa)射(she)(she)后(hou)均(jun)能(neng)(neng)保(bao)(bao)持良好(hao)的(de)(de)性能(neng)(neng)，使用(yong)(yong)過程(cheng)中，發(fa)射(she)(she)信(xin)號(hao)與(yu)接收信(xin)號(hao)完全不受任何千(qian)(qian)擾，可保(bao)(bao)持很好(hao)的(de)(de)穩定性，具(ju)有(you)良好(hao)的(de)(de)抗千(qian)(qian)擾性和(he)(he)抗低頻干(gan)(gan)擾能(neng)(neng)力(li)，即使在惡劣(lie)的(de)(de)環境(jing)下也(ye)(ye)能(neng)(neng)保(bao)(bao)持較(jiao)好(hao)的(de)(de)性能(neng)(neng)。因此(ci)無(wu)(wu)(wu)線系(xi)(xi)統(tong)有(you)較(jiao)高(gao)的(de)(de)可靠(kao)性。

2.功耗小(xiao)、不受天氣、濕度的影響

無(wu)線對講系(xi)統在不同(tong)的(de)環(huan)境(jing)(jing)中，無(wu)線通(tong)信(xin)設(she)(she)備(bei)和有線通(tong)信(xin)設(she)(she)備(bei)一樣都要(yao)進行(xing)電(dian)(dian)(dian)(dian)(dian)能的(de)消耗。當(dang)環(huan)境(jing)(jing)溫(wen)度(du)在-40°C以(yi)下時(shi)，無(wu)線通(tong)信(xin)設(she)(she)備(bei)需(xu)(xu)要(yao)每(mei)天工(gong)作(zuo)8小(xiao)時(shi)左右(you);當(dang)環(huan)境(jing)(jing)溫(wen)度(du)為-20°C時(shi)，每(mei)天工(gong)作(zuo)8小(xiao)時(shi)左右(you);當(dang)環(huan)境(jing)(jing)溫(wen)度(du)為-30°C時(shi)，每(mei)天工(gong)作(zuo)4小(xiao)時(shi)左右(you)。目前(qian)市場上(shang)常見(jian)的(de)無(wu)線對講系(xi)統有兩(liang)種電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)輸入(ru)方式，一種是電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)輸入(ru)，另一種是電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)輸出。從這兩(liang)種方式對系(xi)統的(de)功耗來看，電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)輸入(ru)方式的(de)功耗更大一些，但是功耗很小(xiao)。并且(qie)設(she)(she)備(bei)的(de)工(gong)作(zuo)環(huan)境(jing)(jing)不同(tong)，對電(dian)(dian)(dian)(dian)(dian)池的(de)需(xu)(xu)求量也(ye)不同(tong)，所以(yi)功耗也(ye)不同(tong)。

3信號不受干擾

在(zai)(zai)(zai)一(yi)(yi)些(xie)有(you)干(gan)擾(rao)(rao)(rao)的(de)地方，例(li)如(ru)(ru)野外、機場、工廠等，一(yi)(yi)般采用(yong)分(fen)(fen)頻方式。分(fen)(fen)頻方式的(de)抗(kang)干(gan)擾(rao)(rao)(rao)能力(li)不強(qiang)(qiang)，其(qi)抗(kang)干(gan)擾(rao)(rao)(rao)能力(li)主要(yao)取決于射(she)頻功(gong)率(lv)的(de)大小。分(fen)(fen)頻技(ji)(ji)術的(de)功(gong)率(lv)一(yi)(yi)般是(shi)50dB在(zai)(zai)(zai)50dB左右時，其(qi)抗(kang)干(gan)擾(rao)(rao)(rao)能力(li)強(qiang)(qiang)。但由(you)于分(fen)(fen)頻的(de)干(gan)擾(rao)(rao)(rao)與(yu)噪(zao)聲(主要(yao)是(shi)周邊噪(zao)聲)具有(you)很(hen)(hen)強(qiang)(qiang)的(de)互通性，當(dang)分(fen)(fen)頻發(fa)(fa)射(she)的(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)超過(guo)50dB時，其(qi)抗(kang)千擾(rao)(rao)(rao)能力(li)就會減弱。另外，在(zai)(zai)(zai)一(yi)(yi)些(xie)有(you)噪(zao)音的(de)環境(jing)中使(shi)用(yong)分(fen)(fen)頻技(ji)(ji)術，會使(shi)分(fen)(fen)頻信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)無(wu)法到達發(fa)(fa)射(she)端的(de)接(jie)收機或者造成發(fa)(fa)射(she)端信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接(jie)收端信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)的(de)糟(zao)合而造成分(fen)(fen)頻或干(gan)擾(rao)(rao)(rao)(例(li)如(ru)(ru)在(zai)(zai)(zai)使(shi)用(yong)室外電話時) 。而采用(yong)分(fen)(fen)頻技(ji)(ji)術的(de)無(wu)線對(dui)(dui)講(jiang)系(xi)統(tong)由(you)于發(fa)(fa)射(she)功(gong)率(lv)小，分(fen)(fen)頻后的(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)度比有(you)線對(dui)(dui)講(jiang)系(xi)統(tong)高很(hen)(hen)多(在(zai)(zai)(zai)實際(ji)使(shi)用(yong)中分(fen)(fen)頻設備(bei)一(yi)(yi)般可以將系(xi)統(tong)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)分(fen)(fen)頻到50dB以上),信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)不受干(gan)擾(rao)(rao)(rao)。如(ru)(ru)果采用(yong)分(fen)(fen)頻技(ji)(ji)術，需(xu)要(yao)在(zai)(zai)(zai)較大的(de)回波功(gong)率(lv)下才能實現信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)的(de)分(fen)(fen)頻工作(如(ru)(ru)分(fen)(fen)頻器發(fa)(fa)射(she)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接(jie)收信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)重疊時產生的(de)千擾(rao)(rao)(rao))和發(fa)(fa)送(song)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)度降(jiang)低(di)(同(tong)(tong)頻帶內的(de)兩只天線對(dui)(dui)同(tong)(tong)一(yi)(yi)信(xin)(xin)(xin)(xin)道傳輸的(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)度基本一(yi)(yi)致);如(ru)(ru)果采用(yong)混(hun)響(xiang)技(ji)(ji)術，則可以實現對(dui)(dui)無(wu)線信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)干(gan)擾(rao)(rao)(rao)的(de)抑制或降(jiang)低(di)。