由(you)于在(zai)(zai)(zai)(zai)戶外(wai)(wai)、室內等區(qu)域，無(wu)線(xian)(xian)(xian)(xian)對(dui)講(jiang)(jiang)系(xi)統(tong)的(de)(de)信(xin)號強度較弱(ruo)，而且采用(yong)(yong)(yong)(yong)頻率(lv)調制技術(shu)（如 MHZ、 NMR、 BSI等）產生的(de)(de)信(xin)號傳輸(shu)時(shi)(shi)延大(da)，傳輸(shu)距離(li)遠(yuan)。因此有(you)線(xian)(xian)(xian)(xian)對(dui)講(jiang)(jiang)系(xi)統(tong)不適合(he)在(zai)(zai)(zai)(zai)戶外(wai)(wai)環(huan)境使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)，特別(bie)是(shi)在(zai)(zai)(zai)(zai)冬天及低風速季(ji)節使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)。雖然(ran)無(wu)線(xian)(xian)(xian)(xian)對(dui)講(jiang)(jiang)系(xi)統(tong)也有(you)著不錯的(de)(de)效(xiao)果(guo)(guo)。但(dan)由(you)于系(xi)統(tong)工作時(shi)(shi)會有(you)一(yi)定的(de)(de)干擾，使(shi)(shi)(shi)對(dui)講(jiang)(jiang)效(xiao)果(guo)(guo)下(xia)降，另外(wai)(wai)在(zai)(zai)(zai)(zai)信(xin)號較弱(ruo)時(shi)(shi)對(dui)用(yong)(yong)(yong)(yong)戶語音(yin)(yin)產生了影響。特別(bie)是(shi)在(zai)(zai)(zai)(zai)人員復(fu)雜(za)、通信(xin)距離(li)較短或需要(yao)(yao)較長時(shi)(shi)間使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)時(shi)(shi)。因此，更需要(yao)(yao)有(you)一(yi)個可靠的(de)(de)無(wu)線(xian)(xian)(xian)(xian)對(dui)講(jiang)(jiang)系(xi)統(tong)提供(gong)與有(you)線(xian)(xian)(xian)(xian)對(dui)講(jiang)(jiang)系(xi)統(tong)一(yi)樣(yang)的(de)(de)語音(yin)(yin)信(xin)息與控制。無(wu)線(xian)(xian)(xian)(xian)對(dui)講(jiang)(jiang)系(xi)統(tong)具有(you)很高(gao)的(de)(de)靈活性，它能(neng)夠滿足現場中所有(you)環(huan)境使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)需求并能(neng)隨(sui)(sui)時(shi)(shi)切換（如在(zai)(zai)(zai)(zai)野(ye)外(wai)(wai)、戶外(wai)(wai)電話等),用(yong)(yong)(yong)(yong)戶可以在(zai)(zai)(zai)(zai)任(ren)何(he)地點使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)、隨(sui)(sui)時(shi)(shi)、隨(sui)(sui)地進行通訊。使(shi)(shi)(shi)用(yong)(yong)(yong)(yong)方便、節省(sheng)成本、節約費用(yong)(yong)(yong)(yong)。下(xia)面(mian)我們來了解一(yi)下(xia)無(wu)線(xian)(xian)(xian)(xian)對(dui)講(jiang)(jiang)系(xi)統(tong)它主要(yao)(yao)是(shi)什(shen)么(me)優點？

1.性能穩定(ding)，可靠性高

在(zai)(zai)相同無(wu)線(xian)傳(chuan)(chuan)輸距離下(xia)，無(wu)線(xian)傳(chuan)(chuan)輸信(xin)號(hao)(hao)更穩定(ding)由于使用(yong)了(le)功(gong)(gong)率(lv)放(fang)大器來對(dui)無(wu)線(xian)信(xin)號(hao)(hao)進(jin)行壓(ya)縮(suo)和放(fang)大，使無(wu)線(xian)信(xin)號(hao)(hao)更加穩定(ding)可靠。無(wu)線(xian)信(xin)號(hao)(hao)在(zai)(zai)弱(ruo)電(dian)磁環境(jing)下(xia)也(ye)能(neng)保持(chi)較(jiao)(jiao)(jiao)(jiao)好(hao)的(de)(de)性(xing)(xing)能(neng)。無(wu)線(xian)對(dui)講系(xi)統具(ju)有(you)發(fa)射(she)功(gong)(gong)率(lv)小、抗千擾能(neng)力強(與有(you)線(xian)對(dui)講系(xi)統比較(jiao)(jiao)(jiao)(jiao))和抗電(dian)磁干(gan)擾能(neng)力強(與有(you)線(xian)對(dui)講系(xi)統比較(jiao)(jiao)(jiao)(jiao))的(de)(de)特點。無(wu)線(xian)對(dui)講系(xi)統發(fa)射(she)信(xin)號(hao)(hao)在(zai)(zai)發(fa)射(she)前和發(fa)射(she)后均能(neng)保持(chi)良(liang)好(hao)的(de)(de)性(xing)(xing)能(neng)，使用(yong)過程中(zhong)，發(fa)射(she)信(xin)號(hao)(hao)與接(jie)收信(xin)號(hao)(hao)完全不受(shou)任何千擾，可保持(chi)很好(hao)的(de)(de)穩定(ding)性(xing)(xing)，具(ju)有(you)良(liang)好(hao)的(de)(de)抗千擾性(xing)(xing)和抗低(di)頻干(gan)擾能(neng)力，即使在(zai)(zai)惡(e)劣的(de)(de)環境(jing)下(xia)也(ye)能(neng)保持(chi)較(jiao)(jiao)(jiao)(jiao)好(hao)的(de)(de)性(xing)(xing)能(neng)。因此無(wu)線(xian)系(xi)統有(you)較(jiao)(jiao)(jiao)(jiao)高的(de)(de)可靠性(xing)(xing)。

2.功耗小、不受天氣(qi)、濕度(du)的影響

無線(xian)對(dui)(dui)講系(xi)統(tong)在不(bu)(bu)同(tong)的環(huan)(huan)(huan)(huan)境中，無線(xian)通(tong)信(xin)設(she)備(bei)和有線(xian)通(tong)信(xin)設(she)備(bei)一樣都(dou)要(yao)進行電(dian)能的消耗。當(dang)環(huan)(huan)(huan)(huan)境溫(wen)度在-40°C以下時(shi)(shi)，無線(xian)通(tong)信(xin)設(she)備(bei)需要(yao)每天工作8小時(shi)(shi)左(zuo)右(you);當(dang)環(huan)(huan)(huan)(huan)境溫(wen)度為(wei)-20°C時(shi)(shi)，每天工作8小時(shi)(shi)左(zuo)右(you);當(dang)環(huan)(huan)(huan)(huan)境溫(wen)度為(wei)-30°C時(shi)(shi)，每天工作4小時(shi)(shi)左(zuo)右(you)。目前市(shi)場上(shang)常見的無線(xian)對(dui)(dui)講系(xi)統(tong)有兩種(zhong)電(dian)源輸(shu)入(ru)方式(shi)，一種(zhong)是(shi)電(dian)源輸(shu)入(ru)，另一種(zhong)是(shi)電(dian)源輸(shu)出。從這兩種(zhong)方式(shi)對(dui)(dui)系(xi)統(tong)的功耗來看，電(dian)源輸(shu)入(ru)方式(shi)的功耗更(geng)大一些，但是(shi)功耗很小。并且設(she)備(bei)的工作環(huan)(huan)(huan)(huan)境不(bu)(bu)同(tong)，對(dui)(dui)電(dian)池的需求量也(ye)不(bu)(bu)同(tong)，所以功耗也(ye)不(bu)(bu)同(tong)。

3信號不受干擾

在一(yi)些(xie)有干(gan)(gan)(gan)(gan)擾的(de)(de)(de)地方(fang)(fang)，例(li)如(ru)野外(wai)、機(ji)場、工廠等，一(yi)般(ban)(ban)采(cai)用分(fen)(fen)頻(pin)(pin)(pin)(pin)方(fang)(fang)式。分(fen)(fen)頻(pin)(pin)(pin)(pin)方(fang)(fang)式的(de)(de)(de)抗干(gan)(gan)(gan)(gan)擾能(neng)(neng)力不(bu)強，其(qi)抗干(gan)(gan)(gan)(gan)擾能(neng)(neng)力主要取決于(yu)射頻(pin)(pin)(pin)(pin)功(gong)率(lv)(lv)的(de)(de)(de)大小。分(fen)(fen)頻(pin)(pin)(pin)(pin)技術的(de)(de)(de)功(gong)率(lv)(lv)一(yi)般(ban)(ban)是50dB在50dB左右(you)時(shi)，其(qi)抗干(gan)(gan)(gan)(gan)擾能(neng)(neng)力強。但由(you)于(yu)分(fen)(fen)頻(pin)(pin)(pin)(pin)的(de)(de)(de)干(gan)(gan)(gan)(gan)擾與(yu)噪(zao)聲(sheng)(主要是周邊(bian)噪(zao)聲(sheng))具有很強的(de)(de)(de)互通性，當(dang)分(fen)(fen)頻(pin)(pin)(pin)(pin)發射的(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)超過50dB時(shi)，其(qi)抗千擾能(neng)(neng)力就會減(jian)弱。另外(wai)，在一(yi)些(xie)有噪(zao)音的(de)(de)(de)環境中使(shi)用分(fen)(fen)頻(pin)(pin)(pin)(pin)技術，會使(shi)分(fen)(fen)頻(pin)(pin)(pin)(pin)信(xin)(xin)(xin)號(hao)(hao)(hao)無法到(dao)達發射端(duan)(duan)的(de)(de)(de)接(jie)收(shou)機(ji)或(huo)者造成發射端(duan)(duan)信(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接(jie)收(shou)端(duan)(duan)信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)糟合(he)而造成分(fen)(fen)頻(pin)(pin)(pin)(pin)或(huo)干(gan)(gan)(gan)(gan)擾(例(li)如(ru)在使(shi)用室外(wai)電話(hua)時(shi)) 。而采(cai)用分(fen)(fen)頻(pin)(pin)(pin)(pin)技術的(de)(de)(de)無線(xian)對講系(xi)統由(you)于(yu)發射功(gong)率(lv)(lv)小，分(fen)(fen)頻(pin)(pin)(pin)(pin)后的(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)強度(du)(du)比有線(xian)對講系(xi)統高很多(duo)(在實(shi)際使(shi)用中分(fen)(fen)頻(pin)(pin)(pin)(pin)設備(bei)一(yi)般(ban)(ban)可以(yi)將系(xi)統信(xin)(xin)(xin)號(hao)(hao)(hao)分(fen)(fen)頻(pin)(pin)(pin)(pin)到(dao)50dB以(yi)上(shang)),信(xin)(xin)(xin)號(hao)(hao)(hao)不(bu)受干(gan)(gan)(gan)(gan)擾。如(ru)果(guo)(guo)采(cai)用分(fen)(fen)頻(pin)(pin)(pin)(pin)技術，需要在較大的(de)(de)(de)回(hui)波功(gong)率(lv)(lv)下才能(neng)(neng)實(shi)現信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)分(fen)(fen)頻(pin)(pin)(pin)(pin)工作(zuo)(如(ru)分(fen)(fen)頻(pin)(pin)(pin)(pin)器發射信(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接(jie)收(shou)信(xin)(xin)(xin)號(hao)(hao)(hao)重疊(die)時(shi)產(chan)生(sheng)的(de)(de)(de)千擾)和發送信(xin)(xin)(xin)號(hao)(hao)(hao)強度(du)(du)降(jiang)低(同頻(pin)(pin)(pin)(pin)帶內的(de)(de)(de)兩(liang)只天線(xian)對同一(yi)信(xin)(xin)(xin)道(dao)傳(chuan)輸的(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)強度(du)(du)基(ji)本一(yi)致);如(ru)果(guo)(guo)采(cai)用混響(xiang)技術，則可以(yi)實(shi)現對無線(xian)信(xin)(xin)(xin)號(hao)(hao)(hao)干(gan)(gan)(gan)(gan)擾的(de)(de)(de)抑制或(huo)降(jiang)低。