由于在(zai)(zai)戶(hu)外(wai)、室內(nei)等(deng)區(qu)域，無線(xian)(xian)對講(jiang)系(xi)統(tong)的(de)(de)信號(hao)強度較(jiao)弱，而且采(cai)用(yong)(yong)頻率(lv)調制(zhi)技術（如 MHZ、 NMR、 BSI等(deng)）產生(sheng)的(de)(de)信號(hao)傳(chuan)輸時延大，傳(chuan)輸距(ju)離(li)遠。因(yin)此(ci)有線(xian)(xian)對講(jiang)系(xi)統(tong)不(bu)適合在(zai)(zai)戶(hu)外(wai)環(huan)境(jing)使(shi)用(yong)(yong)，特別(bie)是(shi)在(zai)(zai)冬天(tian)及低風(feng)速季節(jie)使(shi)用(yong)(yong)。雖然無線(xian)(xian)對講(jiang)系(xi)統(tong)也有著不(bu)錯的(de)(de)效(xiao)果(guo)。但(dan)由于系(xi)統(tong)工(gong)作時會有一(yi)(yi)定(ding)的(de)(de)干擾，使(shi)對講(jiang)效(xiao)果(guo)下(xia)降，另外(wai)在(zai)(zai)信號(hao)較(jiao)弱時對用(yong)(yong)戶(hu)語(yu)音產生(sheng)了影響。特別(bie)是(shi)在(zai)(zai)人員復(fu)雜、通(tong)信距(ju)離(li)較(jiao)短或需(xu)(xu)要較(jiao)長時間使(shi)用(yong)(yong)時。因(yin)此(ci)，更需(xu)(xu)要有一(yi)(yi)個可(ke)靠的(de)(de)無線(xian)(xian)對講(jiang)系(xi)統(tong)提供與(yu)有線(xian)(xian)對講(jiang)系(xi)統(tong)一(yi)(yi)樣的(de)(de)語(yu)音信息(xi)與(yu)控制(zhi)。無線(xian)(xian)對講(jiang)系(xi)統(tong)具有很高的(de)(de)靈活性，它(ta)能夠滿足現場中所有環(huan)境(jing)使(shi)用(yong)(yong)需(xu)(xu)求(qiu)并(bing)能隨(sui)時切(qie)換（如在(zai)(zai)野外(wai)、戶(hu)外(wai)電話等(deng)),用(yong)(yong)戶(hu)可(ke)以在(zai)(zai)任何地(di)點使(shi)用(yong)(yong)、隨(sui)時、隨(sui)地(di)進行通(tong)訊。使(shi)用(yong)(yong)方便(bian)、節(jie)省成本、節(jie)約費用(yong)(yong)。下(xia)面我們來了解(jie)一(yi)(yi)下(xia)無線(xian)(xian)對講(jiang)系(xi)統(tong)它(ta)主要是(shi)什么優點？

1.性能(neng)穩定(ding)，可靠(kao)性高(gao)

在(zai)(zai)相同無(wu)線(xian)傳輸(shu)距離下(xia)，無(wu)線(xian)傳輸(shu)信(xin)(xin)(xin)號(hao)(hao)更穩定(ding)(ding)(ding)由(you)于(yu)使(shi)(shi)用了功率放大(da)器來對無(wu)線(xian)信(xin)(xin)(xin)號(hao)(hao)進行壓縮(suo)和放大(da)，使(shi)(shi)無(wu)線(xian)信(xin)(xin)(xin)號(hao)(hao)更加穩定(ding)(ding)(ding)可(ke)靠。無(wu)線(xian)信(xin)(xin)(xin)號(hao)(hao)在(zai)(zai)弱電磁環(huan)境(jing)下(xia)也能(neng)(neng)保(bao)持(chi)較好(hao)(hao)的(de)(de)性(xing)(xing)能(neng)(neng)。無(wu)線(xian)對講(jiang)(jiang)系統(tong)(tong)具(ju)有(you)發(fa)射(she)(she)功率小、抗(kang)千(qian)擾(rao)能(neng)(neng)力(li)強(與有(you)線(xian)對講(jiang)(jiang)系統(tong)(tong)比較)和抗(kang)電磁干(gan)擾(rao)能(neng)(neng)力(li)強(與有(you)線(xian)對講(jiang)(jiang)系統(tong)(tong)比較)的(de)(de)特(te)點。無(wu)線(xian)對講(jiang)(jiang)系統(tong)(tong)發(fa)射(she)(she)信(xin)(xin)(xin)號(hao)(hao)在(zai)(zai)發(fa)射(she)(she)前和發(fa)射(she)(she)后均能(neng)(neng)保(bao)持(chi)良(liang)好(hao)(hao)的(de)(de)性(xing)(xing)能(neng)(neng)，使(shi)(shi)用過程(cheng)中(zhong)，發(fa)射(she)(she)信(xin)(xin)(xin)號(hao)(hao)與接(jie)收信(xin)(xin)(xin)號(hao)(hao)完全不受(shou)任何千(qian)擾(rao)，可(ke)保(bao)持(chi)很好(hao)(hao)的(de)(de)穩定(ding)(ding)(ding)性(xing)(xing)，具(ju)有(you)良(liang)好(hao)(hao)的(de)(de)抗(kang)千(qian)擾(rao)性(xing)(xing)和抗(kang)低頻(pin)干(gan)擾(rao)能(neng)(neng)力(li)，即使(shi)(shi)在(zai)(zai)惡劣(lie)的(de)(de)環(huan)境(jing)下(xia)也能(neng)(neng)保(bao)持(chi)較好(hao)(hao)的(de)(de)性(xing)(xing)能(neng)(neng)。因此(ci)無(wu)線(xian)系統(tong)(tong)有(you)較高(gao)的(de)(de)可(ke)靠性(xing)(xing)。

2.功耗(hao)小、不受天氣、濕度的影響

無(wu)線對(dui)(dui)講(jiang)系(xi)統(tong)在(zai)不(bu)同(tong)的(de)(de)環境中，無(wu)線通信設(she)備(bei)和有(you)線通信設(she)備(bei)一(yi)樣都要(yao)進(jin)行電(dian)(dian)(dian)能(neng)的(de)(de)消耗(hao)(hao)。當(dang)環境溫度(du)在(zai)-40°C以(yi)下時，無(wu)線通信設(she)備(bei)需(xu)要(yao)每天工(gong)作(zuo)8小時左右(you)(you);當(dang)環境溫度(du)為(wei)-20°C時，每天工(gong)作(zuo)8小時左右(you)(you);當(dang)環境溫度(du)為(wei)-30°C時，每天工(gong)作(zuo)4小時左右(you)(you)。目(mu)前市(shi)場上常(chang)見(jian)的(de)(de)無(wu)線對(dui)(dui)講(jiang)系(xi)統(tong)有(you)兩種(zhong)電(dian)(dian)(dian)源(yuan)輸入方式(shi)，一(yi)種(zhong)是(shi)電(dian)(dian)(dian)源(yuan)輸入，另(ling)一(yi)種(zhong)是(shi)電(dian)(dian)(dian)源(yuan)輸出。從(cong)這兩種(zhong)方式(shi)對(dui)(dui)系(xi)統(tong)的(de)(de)功(gong)(gong)(gong)耗(hao)(hao)來看，電(dian)(dian)(dian)源(yuan)輸入方式(shi)的(de)(de)功(gong)(gong)(gong)耗(hao)(hao)更大一(yi)些，但(dan)是(shi)功(gong)(gong)(gong)耗(hao)(hao)很小。并且設(she)備(bei)的(de)(de)工(gong)作(zuo)環境不(bu)同(tong)，對(dui)(dui)電(dian)(dian)(dian)池的(de)(de)需(xu)求量也不(bu)同(tong)，所以(yi)功(gong)(gong)(gong)耗(hao)(hao)也不(bu)同(tong)。

3信號不受干擾

在(zai)一(yi)(yi)些有干擾(rao)(rao)(rao)的(de)(de)(de)(de)(de)(de)地方(fang)，例如(ru)野外(wai)、機(ji)場、工廠(chang)等，一(yi)(yi)般采(cai)用(yong)(yong)(yong)(yong)分(fen)頻(pin)(pin)(pin)(pin)(pin)方(fang)式。分(fen)頻(pin)(pin)(pin)(pin)(pin)方(fang)式的(de)(de)(de)(de)(de)(de)抗干擾(rao)(rao)(rao)能力不強(qiang)，其(qi)(qi)抗干擾(rao)(rao)(rao)能力主(zhu)要取決于射(she)頻(pin)(pin)(pin)(pin)(pin)功率(lv)的(de)(de)(de)(de)(de)(de)大(da)(da)小。分(fen)頻(pin)(pin)(pin)(pin)(pin)技術的(de)(de)(de)(de)(de)(de)功率(lv)一(yi)(yi)般是50dB在(zai)50dB左右(you)時(shi)，其(qi)(qi)抗干擾(rao)(rao)(rao)能力強(qiang)。但由于分(fen)頻(pin)(pin)(pin)(pin)(pin)的(de)(de)(de)(de)(de)(de)干擾(rao)(rao)(rao)與噪(zao)(zao)聲(sheng)(sheng)(主(zhu)要是周邊噪(zao)(zao)聲(sheng)(sheng))具有很強(qiang)的(de)(de)(de)(de)(de)(de)互通性，當分(fen)頻(pin)(pin)(pin)(pin)(pin)發(fa)射(she)的(de)(de)(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)超過50dB時(shi)，其(qi)(qi)抗千擾(rao)(rao)(rao)能力就會減(jian)弱。另外(wai)，在(zai)一(yi)(yi)些有噪(zao)(zao)音的(de)(de)(de)(de)(de)(de)環境中使(shi)用(yong)(yong)(yong)(yong)分(fen)頻(pin)(pin)(pin)(pin)(pin)技術，會使(shi)分(fen)頻(pin)(pin)(pin)(pin)(pin)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)無(wu)法(fa)到達(da)發(fa)射(she)端的(de)(de)(de)(de)(de)(de)接收(shou)(shou)機(ji)或(huo)者造(zao)成發(fa)射(she)端信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)與接收(shou)(shou)端信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)的(de)(de)(de)(de)(de)(de)糟合而(er)造(zao)成分(fen)頻(pin)(pin)(pin)(pin)(pin)或(huo)干擾(rao)(rao)(rao)(例如(ru)在(zai)使(shi)用(yong)(yong)(yong)(yong)室外(wai)電話時(shi)) 。而(er)采(cai)用(yong)(yong)(yong)(yong)分(fen)頻(pin)(pin)(pin)(pin)(pin)技術的(de)(de)(de)(de)(de)(de)無(wu)線對講系(xi)統由于發(fa)射(she)功率(lv)小，分(fen)頻(pin)(pin)(pin)(pin)(pin)后的(de)(de)(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)強(qiang)度比有線對講系(xi)統高很多(duo)(在(zai)實(shi)際(ji)使(shi)用(yong)(yong)(yong)(yong)中分(fen)頻(pin)(pin)(pin)(pin)(pin)設備一(yi)(yi)般可以(yi)將系(xi)統信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)分(fen)頻(pin)(pin)(pin)(pin)(pin)到50dB以(yi)上),信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)不受干擾(rao)(rao)(rao)。如(ru)果采(cai)用(yong)(yong)(yong)(yong)分(fen)頻(pin)(pin)(pin)(pin)(pin)技術，需要在(zai)較(jiao)大(da)(da)的(de)(de)(de)(de)(de)(de)回波功率(lv)下才能實(shi)現信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)的(de)(de)(de)(de)(de)(de)分(fen)頻(pin)(pin)(pin)(pin)(pin)工作(如(ru)分(fen)頻(pin)(pin)(pin)(pin)(pin)器發(fa)射(she)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)與接收(shou)(shou)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)重(zhong)疊時(shi)產(chan)生的(de)(de)(de)(de)(de)(de)千擾(rao)(rao)(rao))和發(fa)送信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)強(qiang)度降(jiang)低(同頻(pin)(pin)(pin)(pin)(pin)帶內的(de)(de)(de)(de)(de)(de)兩只天線對同一(yi)(yi)信(xin)(xin)(xin)道傳輸的(de)(de)(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)強(qiang)度基本一(yi)(yi)致(zhi));如(ru)果采(cai)用(yong)(yong)(yong)(yong)混響技術，則可以(yi)實(shi)現對無(wu)線信(xin)(xin)(xin)號(hao)(hao)(hao)(hao)干擾(rao)(rao)(rao)的(de)(de)(de)(de)(de)(de)抑(yi)制或(huo)降(jiang)低。