由(you)于在(zai)(zai)(zai)戶(hu)(hu)(hu)外(wai)(wai)(wai)、室(shi)內等區域，無線(xian)對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)的(de)(de)(de)(de)信(xin)號(hao)(hao)強度較(jiao)弱(ruo)，而且采用(yong)(yong)(yong)(yong)(yong)頻率調制技術（如 MHZ、 NMR、 BSI等）產生的(de)(de)(de)(de)信(xin)號(hao)(hao)傳(chuan)輸(shu)(shu)時(shi)延大，傳(chuan)輸(shu)(shu)距離遠。因(yin)此有線(xian)對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)不適(shi)合在(zai)(zai)(zai)戶(hu)(hu)(hu)外(wai)(wai)(wai)環境(jing)(jing)使用(yong)(yong)(yong)(yong)(yong)，特(te)別(bie)是(shi)在(zai)(zai)(zai)冬天及低風速季節(jie)使用(yong)(yong)(yong)(yong)(yong)。雖然無線(xian)對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)也有著不錯的(de)(de)(de)(de)效果。但由(you)于系(xi)(xi)(xi)統(tong)工(gong)作(zuo)時(shi)會有一定的(de)(de)(de)(de)干擾，使對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)效果下(xia)(xia)降，另外(wai)(wai)(wai)在(zai)(zai)(zai)信(xin)號(hao)(hao)較(jiao)弱(ruo)時(shi)對(dui)(dui)(dui)(dui)(dui)用(yong)(yong)(yong)(yong)(yong)戶(hu)(hu)(hu)語音(yin)產生了影響。特(te)別(bie)是(shi)在(zai)(zai)(zai)人員復雜、通信(xin)距離較(jiao)短(duan)或需(xu)(xu)要(yao)(yao)較(jiao)長時(shi)間使用(yong)(yong)(yong)(yong)(yong)時(shi)。因(yin)此，更需(xu)(xu)要(yao)(yao)有一個可(ke)靠的(de)(de)(de)(de)無線(xian)對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)提供(gong)與有線(xian)對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)一樣的(de)(de)(de)(de)語音(yin)信(xin)息與控制。無線(xian)對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)具有很高(gao)的(de)(de)(de)(de)靈活性，它(ta)能夠滿足現場(chang)中所(suo)有環境(jing)(jing)使用(yong)(yong)(yong)(yong)(yong)需(xu)(xu)求(qiu)并能隨時(shi)切換（如在(zai)(zai)(zai)野外(wai)(wai)(wai)、戶(hu)(hu)(hu)外(wai)(wai)(wai)電話等),用(yong)(yong)(yong)(yong)(yong)戶(hu)(hu)(hu)可(ke)以(yi)在(zai)(zai)(zai)任何地點使用(yong)(yong)(yong)(yong)(yong)、隨時(shi)、隨地進行通訊。使用(yong)(yong)(yong)(yong)(yong)方便(bian)、節(jie)省(sheng)成本(ben)、節(jie)約(yue)費用(yong)(yong)(yong)(yong)(yong)。下(xia)(xia)面我們來了解(jie)一下(xia)(xia)無線(xian)對(dui)(dui)(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)(xi)統(tong)它(ta)主要(yao)(yao)是(shi)什(shen)么優點？

1.性(xing)能穩定(ding)，可(ke)靠性(xing)高

在(zai)(zai)相(xiang)同無線(xian)(xian)(xian)傳輸距(ju)離下，無線(xian)(xian)(xian)傳輸信(xin)(xin)號(hao)更穩定由(you)于使(shi)用(yong)了功(gong)率放(fang)大器來對(dui)無線(xian)(xian)(xian)信(xin)(xin)號(hao)進(jin)行壓縮和(he)放(fang)大，使(shi)無線(xian)(xian)(xian)信(xin)(xin)號(hao)更加穩定可靠(kao)。無線(xian)(xian)(xian)信(xin)(xin)號(hao)在(zai)(zai)弱電磁環(huan)境下也能(neng)(neng)(neng)保持(chi)(chi)較好的(de)(de)(de)(de)(de)性(xing)(xing)能(neng)(neng)(neng)。無線(xian)(xian)(xian)對(dui)講系(xi)統(tong)具(ju)有(you)(you)發射功(gong)率小、抗(kang)千(qian)擾能(neng)(neng)(neng)力強(與有(you)(you)線(xian)(xian)(xian)對(dui)講系(xi)統(tong)比較)和(he)抗(kang)電磁干擾能(neng)(neng)(neng)力強(與有(you)(you)線(xian)(xian)(xian)對(dui)講系(xi)統(tong)比較)的(de)(de)(de)(de)(de)特點。無線(xian)(xian)(xian)對(dui)講系(xi)統(tong)發射信(xin)(xin)號(hao)在(zai)(zai)發射前和(he)發射后均能(neng)(neng)(neng)保持(chi)(chi)良(liang)好的(de)(de)(de)(de)(de)性(xing)(xing)能(neng)(neng)(neng)，使(shi)用(yong)過程中，發射信(xin)(xin)號(hao)與接(jie)收信(xin)(xin)號(hao)完(wan)全不(bu)受任何千(qian)擾，可保持(chi)(chi)很好的(de)(de)(de)(de)(de)穩定性(xing)(xing)，具(ju)有(you)(you)良(liang)好的(de)(de)(de)(de)(de)抗(kang)千(qian)擾性(xing)(xing)和(he)抗(kang)低頻(pin)干擾能(neng)(neng)(neng)力，即使(shi)在(zai)(zai)惡劣的(de)(de)(de)(de)(de)環(huan)境下也能(neng)(neng)(neng)保持(chi)(chi)較好的(de)(de)(de)(de)(de)性(xing)(xing)能(neng)(neng)(neng)。因此無線(xian)(xian)(xian)系(xi)統(tong)有(you)(you)較高的(de)(de)(de)(de)(de)可靠(kao)性(xing)(xing)。

2.功耗小、不受天氣、濕度的(de)影響

無線對講系(xi)統在不(bu)同的環(huan)(huan)境(jing)中，無線通信設(she)備(bei)和有線通信設(she)備(bei)一(yi)樣都要(yao)進行電(dian)(dian)(dian)能的消(xiao)耗。當環(huan)(huan)境(jing)溫(wen)度在-40°C以下時(shi)(shi)，無線通信設(she)備(bei)需要(yao)每天(tian)(tian)工(gong)作8小(xiao)時(shi)(shi)左右;當環(huan)(huan)境(jing)溫(wen)度為-20°C時(shi)(shi)，每天(tian)(tian)工(gong)作8小(xiao)時(shi)(shi)左右;當環(huan)(huan)境(jing)溫(wen)度為-30°C時(shi)(shi)，每天(tian)(tian)工(gong)作4小(xiao)時(shi)(shi)左右。目前市場上常見的無線對講系(xi)統有兩種(zhong)電(dian)(dian)(dian)源輸(shu)(shu)入方式(shi)，一(yi)種(zhong)是(shi)電(dian)(dian)(dian)源輸(shu)(shu)入，另一(yi)種(zhong)是(shi)電(dian)(dian)(dian)源輸(shu)(shu)出。從這兩種(zhong)方式(shi)對系(xi)統的功(gong)(gong)耗來看，電(dian)(dian)(dian)源輸(shu)(shu)入方式(shi)的功(gong)(gong)耗更(geng)大一(yi)些，但是(shi)功(gong)(gong)耗很(hen)小(xiao)。并且設(she)備(bei)的工(gong)作環(huan)(huan)境(jing)不(bu)同，對電(dian)(dian)(dian)池的需求量也不(bu)同，所(suo)以功(gong)(gong)耗也不(bu)同。

3信號不受干擾

在一(yi)些有(you)干擾(rao)的(de)(de)(de)(de)(de)地(di)方(fang)，例如(ru)野外、機(ji)場、工廠等，一(yi)般采用(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)方(fang)式(shi)。分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)方(fang)式(shi)的(de)(de)(de)(de)(de)抗(kang)(kang)干擾(rao)能力(li)不強，其(qi)抗(kang)(kang)干擾(rao)能力(li)主要取決于(yu)射(she)(she)頻(pin)(pin)(pin)(pin)(pin)功(gong)率(lv)的(de)(de)(de)(de)(de)大(da)小。分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)(de)(de)功(gong)率(lv)一(yi)般是(shi)50dB在50dB左右時，其(qi)抗(kang)(kang)干擾(rao)能力(li)強。但由于(yu)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)的(de)(de)(de)(de)(de)干擾(rao)與(yu)噪(zao)聲(主要是(shi)周(zhou)邊噪(zao)聲)具有(you)很強的(de)(de)(de)(de)(de)互通(tong)性(xing)，當分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)發(fa)射(she)(she)的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)超過50dB時，其(qi)抗(kang)(kang)千(qian)擾(rao)能力(li)就(jiu)會減弱。另外，在一(yi)些有(you)噪(zao)音的(de)(de)(de)(de)(de)環境中使(shi)用(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)，會使(shi)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)無(wu)(wu)法到達發(fa)射(she)(she)端(duan)的(de)(de)(de)(de)(de)接(jie)收(shou)機(ji)或者造(zao)成(cheng)發(fa)射(she)(she)端(duan)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接(jie)收(shou)端(duan)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)(de)糟合而(er)造(zao)成(cheng)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)或干擾(rao)(例如(ru)在使(shi)用(yong)室外電話時) 。而(er)采用(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)的(de)(de)(de)(de)(de)無(wu)(wu)線對(dui)(dui)講(jiang)系統(tong)(tong)由于(yu)發(fa)射(she)(she)功(gong)率(lv)小，分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)后(hou)的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強度(du)比有(you)線對(dui)(dui)講(jiang)系統(tong)(tong)高很多(duo)(在實際(ji)使(shi)用(yong)中分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)設備(bei)一(yi)般可以(yi)將系統(tong)(tong)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)到50dB以(yi)上(shang)),信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)不受干擾(rao)。如(ru)果(guo)采用(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)技(ji)術(shu)，需要在較大(da)的(de)(de)(de)(de)(de)回波(bo)功(gong)率(lv)下才能實現信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)(de)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)工作(如(ru)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)器發(fa)射(she)(she)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接(jie)收(shou)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)重疊(die)時產生的(de)(de)(de)(de)(de)千(qian)擾(rao))和發(fa)送信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強度(du)降(jiang)低(同頻(pin)(pin)(pin)(pin)(pin)帶內(nei)的(de)(de)(de)(de)(de)兩只(zhi)天線對(dui)(dui)同一(yi)信(xin)(xin)(xin)(xin)道傳輸(shu)的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強度(du)基本一(yi)致);如(ru)果(guo)采用(yong)混響技(ji)術(shu)，則可以(yi)實現對(dui)(dui)無(wu)(wu)線信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)干擾(rao)的(de)(de)(de)(de)(de)抑制或降(jiang)低。