由(you)(you)于在(zai)戶(hu)外(wai)(wai)、室內等(deng)區(qu)域，無(wu)線(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)(tong)(tong)的(de)(de)信(xin)號(hao)強度較(jiao)弱，而(er)且采用(yong)(yong)頻率調制(zhi)技術（如 MHZ、 NMR、 BSI等(deng)）產(chan)生(sheng)的(de)(de)信(xin)號(hao)傳輸時(shi)(shi)延大，傳輸距(ju)離遠。因(yin)此有(you)(you)線(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)(tong)(tong)不(bu)適(shi)合在(zai)戶(hu)外(wai)(wai)環境使(shi)用(yong)(yong)，特(te)別是在(zai)冬天及(ji)低風速(su)季節(jie)使(shi)用(yong)(yong)。雖(sui)然無(wu)線(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)(tong)(tong)也有(you)(you)著不(bu)錯的(de)(de)效果。但(dan)由(you)(you)于系(xi)(xi)統(tong)(tong)(tong)(tong)工作(zuo)時(shi)(shi)會有(you)(you)一(yi)定的(de)(de)干擾，使(shi)對(dui)(dui)(dui)(dui)講(jiang)(jiang)效果下(xia)降，另(ling)外(wai)(wai)在(zai)信(xin)號(hao)較(jiao)弱時(shi)(shi)對(dui)(dui)(dui)(dui)用(yong)(yong)戶(hu)語音產(chan)生(sheng)了(le)影響。特(te)別是在(zai)人(ren)員復雜、通(tong)信(xin)距(ju)離較(jiao)短或(huo)需(xu)(xu)要(yao)較(jiao)長時(shi)(shi)間使(shi)用(yong)(yong)時(shi)(shi)。因(yin)此，更需(xu)(xu)要(yao)有(you)(you)一(yi)個可靠的(de)(de)無(wu)線(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)(tong)(tong)提(ti)供與有(you)(you)線(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)(tong)(tong)一(yi)樣的(de)(de)語音信(xin)息與控制(zhi)。無(wu)線(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)(tong)(tong)具有(you)(you)很高的(de)(de)靈(ling)活性(xing)，它能夠滿(man)足(zu)現(xian)場中所(suo)有(you)(you)環境使(shi)用(yong)(yong)需(xu)(xu)求(qiu)并能隨(sui)時(shi)(shi)切換（如在(zai)野外(wai)(wai)、戶(hu)外(wai)(wai)電話(hua)等(deng)),用(yong)(yong)戶(hu)可以在(zai)任何地(di)點使(shi)用(yong)(yong)、隨(sui)時(shi)(shi)、隨(sui)地(di)進(jin)行通(tong)訊(xun)。使(shi)用(yong)(yong)方(fang)便(bian)、節(jie)省成本、節(jie)約(yue)費(fei)用(yong)(yong)。下(xia)面我們來(lai)了(le)解一(yi)下(xia)無(wu)線(xian)(xian)對(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統(tong)(tong)(tong)(tong)它主要(yao)是什么(me)優點？

1.性(xing)(xing)能穩定，可靠(kao)性(xing)(xing)高

在(zai)相(xiang)同無(wu)(wu)(wu)線(xian)(xian)傳輸(shu)距離下(xia)，無(wu)(wu)(wu)線(xian)(xian)傳輸(shu)信(xin)(xin)(xin)號(hao)(hao)(hao)更(geng)穩(wen)(wen)定(ding)由(you)于(yu)使用(yong)了功率(lv)放(fang)大(da)器來對(dui)(dui)無(wu)(wu)(wu)線(xian)(xian)信(xin)(xin)(xin)號(hao)(hao)(hao)進行壓縮(suo)和(he)放(fang)大(da)，使無(wu)(wu)(wu)線(xian)(xian)信(xin)(xin)(xin)號(hao)(hao)(hao)更(geng)加(jia)穩(wen)(wen)定(ding)可(ke)靠。無(wu)(wu)(wu)線(xian)(xian)信(xin)(xin)(xin)號(hao)(hao)(hao)在(zai)弱電磁(ci)環境下(xia)也能(neng)(neng)保(bao)(bao)(bao)持較(jiao)好(hao)的性(xing)能(neng)(neng)。無(wu)(wu)(wu)線(xian)(xian)對(dui)(dui)講系(xi)統(tong)(tong)具有發射功率(lv)小、抗千(qian)擾能(neng)(neng)力強(與(yu)(yu)有線(xian)(xian)對(dui)(dui)講系(xi)統(tong)(tong)比較(jiao))和(he)抗電磁(ci)干(gan)(gan)擾能(neng)(neng)力強(與(yu)(yu)有線(xian)(xian)對(dui)(dui)講系(xi)統(tong)(tong)比較(jiao))的特點(dian)。無(wu)(wu)(wu)線(xian)(xian)對(dui)(dui)講系(xi)統(tong)(tong)發射信(xin)(xin)(xin)號(hao)(hao)(hao)在(zai)發射前和(he)發射后(hou)均能(neng)(neng)保(bao)(bao)(bao)持良(liang)好(hao)的性(xing)能(neng)(neng)，使用(yong)過程(cheng)中，發射信(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)(yu)接收信(xin)(xin)(xin)號(hao)(hao)(hao)完全不受任何千(qian)擾，可(ke)保(bao)(bao)(bao)持很好(hao)的穩(wen)(wen)定(ding)性(xing)，具有良(liang)好(hao)的抗千(qian)擾性(xing)和(he)抗低頻干(gan)(gan)擾能(neng)(neng)力，即使在(zai)惡劣的環境下(xia)也能(neng)(neng)保(bao)(bao)(bao)持較(jiao)好(hao)的性(xing)能(neng)(neng)。因此無(wu)(wu)(wu)線(xian)(xian)系(xi)統(tong)(tong)有較(jiao)高的可(ke)靠性(xing)。

2.功耗小、不受天氣(qi)、濕度的影響

無(wu)(wu)線(xian)對(dui)講(jiang)(jiang)系統(tong)在(zai)不(bu)(bu)同的環(huan)境中，無(wu)(wu)線(xian)通信設備和有線(xian)通信設備一樣都要進(jin)行電(dian)(dian)能(neng)的消耗。當環(huan)境溫(wen)度(du)在(zai)-40°C以(yi)下時(shi)，無(wu)(wu)線(xian)通信設備需(xu)要每(mei)(mei)天工(gong)作(zuo)(zuo)8小(xiao)(xiao)時(shi)左(zuo)右;當環(huan)境溫(wen)度(du)為(wei)-20°C時(shi)，每(mei)(mei)天工(gong)作(zuo)(zuo)8小(xiao)(xiao)時(shi)左(zuo)右;當環(huan)境溫(wen)度(du)為(wei)-30°C時(shi)，每(mei)(mei)天工(gong)作(zuo)(zuo)4小(xiao)(xiao)時(shi)左(zuo)右。目前市(shi)場上常見的無(wu)(wu)線(xian)對(dui)講(jiang)(jiang)系統(tong)有兩種(zhong)(zhong)電(dian)(dian)源(yuan)輸(shu)入(ru)方(fang)式(shi)，一種(zhong)(zhong)是電(dian)(dian)源(yuan)輸(shu)入(ru)，另一種(zhong)(zhong)是電(dian)(dian)源(yuan)輸(shu)出。從這兩種(zhong)(zhong)方(fang)式(shi)對(dui)系統(tong)的功(gong)(gong)耗來看，電(dian)(dian)源(yuan)輸(shu)入(ru)方(fang)式(shi)的功(gong)(gong)耗更大(da)一些，但是功(gong)(gong)耗很小(xiao)(xiao)。并且設備的工(gong)作(zuo)(zuo)環(huan)境不(bu)(bu)同，對(dui)電(dian)(dian)池的需(xu)求(qiu)量(liang)也不(bu)(bu)同，所(suo)以(yi)功(gong)(gong)耗也不(bu)(bu)同。

3信號不受干擾

在一(yi)些(xie)有(you)干(gan)擾(rao)的(de)(de)(de)(de)(de)地方(fang)，例(li)如野(ye)外、機場(chang)、工(gong)廠等，一(yi)般(ban)采(cai)(cai)用分(fen)(fen)(fen)頻(pin)方(fang)式。分(fen)(fen)(fen)頻(pin)方(fang)式的(de)(de)(de)(de)(de)抗(kang)(kang)干(gan)擾(rao)能(neng)力(li)不強，其抗(kang)(kang)干(gan)擾(rao)能(neng)力(li)主要取決于(yu)(yu)射(she)頻(pin)功率(lv)的(de)(de)(de)(de)(de)大(da)(da)小。分(fen)(fen)(fen)頻(pin)技術的(de)(de)(de)(de)(de)功率(lv)一(yi)般(ban)是50dB在50dB左右時，其抗(kang)(kang)干(gan)擾(rao)能(neng)力(li)強。但由于(yu)(yu)分(fen)(fen)(fen)頻(pin)的(de)(de)(de)(de)(de)干(gan)擾(rao)與(yu)噪聲(主要是周邊(bian)噪聲)具有(you)很強的(de)(de)(de)(de)(de)互(hu)通性，當分(fen)(fen)(fen)頻(pin)發(fa)(fa)(fa)射(she)的(de)(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)超過50dB時，其抗(kang)(kang)千擾(rao)能(neng)力(li)就會(hui)減弱。另外，在一(yi)些(xie)有(you)噪音的(de)(de)(de)(de)(de)環境中(zhong)使用分(fen)(fen)(fen)頻(pin)技術，會(hui)使分(fen)(fen)(fen)頻(pin)信(xin)(xin)(xin)號(hao)(hao)(hao)無(wu)法到(dao)達發(fa)(fa)(fa)射(she)端(duan)的(de)(de)(de)(de)(de)接(jie)收(shou)機或者(zhe)造成發(fa)(fa)(fa)射(she)端(duan)信(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接(jie)收(shou)端(duan)信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)(de)糟合而(er)造成分(fen)(fen)(fen)頻(pin)或干(gan)擾(rao)(例(li)如在使用室外電話時) 。而(er)采(cai)(cai)用分(fen)(fen)(fen)頻(pin)技術的(de)(de)(de)(de)(de)無(wu)線(xian)對(dui)講系(xi)統由于(yu)(yu)發(fa)(fa)(fa)射(she)功率(lv)小，分(fen)(fen)(fen)頻(pin)后(hou)的(de)(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)強度比有(you)線(xian)對(dui)講系(xi)統高很多(在實(shi)際使用中(zhong)分(fen)(fen)(fen)頻(pin)設備一(yi)般(ban)可以將系(xi)統信(xin)(xin)(xin)號(hao)(hao)(hao)分(fen)(fen)(fen)頻(pin)到(dao)50dB以上),信(xin)(xin)(xin)號(hao)(hao)(hao)不受干(gan)擾(rao)。如果采(cai)(cai)用分(fen)(fen)(fen)頻(pin)技術，需要在較大(da)(da)的(de)(de)(de)(de)(de)回(hui)波功率(lv)下才能(neng)實(shi)現信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)(de)分(fen)(fen)(fen)頻(pin)工(gong)作(如分(fen)(fen)(fen)頻(pin)器(qi)發(fa)(fa)(fa)射(she)信(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接(jie)收(shou)信(xin)(xin)(xin)號(hao)(hao)(hao)重疊時產生的(de)(de)(de)(de)(de)千擾(rao))和發(fa)(fa)(fa)送信(xin)(xin)(xin)號(hao)(hao)(hao)強度降低(同(tong)頻(pin)帶(dai)內(nei)的(de)(de)(de)(de)(de)兩(liang)只天(tian)線(xian)對(dui)同(tong)一(yi)信(xin)(xin)(xin)道(dao)傳輸的(de)(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)強度基本一(yi)致(zhi));如果采(cai)(cai)用混響技術，則(ze)可以實(shi)現對(dui)無(wu)線(xian)信(xin)(xin)(xin)號(hao)(hao)(hao)干(gan)擾(rao)的(de)(de)(de)(de)(de)抑制或降低。