由于(yu)在戶(hu)外、室內等區域，無線(xian)對(dui)(dui)講(jiang)系統(tong)(tong)(tong)(tong)的(de)(de)(de)信(xin)號強(qiang)度較(jiao)(jiao)弱，而且(qie)采用頻率(lv)調制技術(shu)（如 MHZ、 NMR、 BSI等）產(chan)生的(de)(de)(de)信(xin)號傳(chuan)輸(shu)時(shi)(shi)延大(da)，傳(chuan)輸(shu)距離遠(yuan)。因此(ci)(ci)有(you)(you)(you)(you)線(xian)對(dui)(dui)講(jiang)系統(tong)(tong)(tong)(tong)不(bu)適合在戶(hu)外環(huan)境使(shi)用，特別是在冬天及低風速季節(jie)使(shi)用。雖然無線(xian)對(dui)(dui)講(jiang)系統(tong)(tong)(tong)(tong)也有(you)(you)(you)(you)著不(bu)錯的(de)(de)(de)效果。但由于(yu)系統(tong)(tong)(tong)(tong)工(gong)作時(shi)(shi)會有(you)(you)(you)(you)一定的(de)(de)(de)干擾(rao)，使(shi)對(dui)(dui)講(jiang)效果下降，另外在信(xin)號較(jiao)(jiao)弱時(shi)(shi)對(dui)(dui)用戶(hu)語(yu)音產(chan)生了(le)影(ying)響。特別是在人員復雜、通信(xin)距離較(jiao)(jiao)短或需要較(jiao)(jiao)長時(shi)(shi)間使(shi)用時(shi)(shi)。因此(ci)(ci)，更需要有(you)(you)(you)(you)一個可(ke)靠的(de)(de)(de)無線(xian)對(dui)(dui)講(jiang)系統(tong)(tong)(tong)(tong)提供與有(you)(you)(you)(you)線(xian)對(dui)(dui)講(jiang)系統(tong)(tong)(tong)(tong)一樣的(de)(de)(de)語(yu)音信(xin)息與控(kong)制。無線(xian)對(dui)(dui)講(jiang)系統(tong)(tong)(tong)(tong)具有(you)(you)(you)(you)很高的(de)(de)(de)靈(ling)活(huo)性，它能夠滿足現(xian)場中所有(you)(you)(you)(you)環(huan)境使(shi)用需求并能隨時(shi)(shi)切換（如在野外、戶(hu)外電話等),用戶(hu)可(ke)以在任何地(di)點(dian)使(shi)用、隨時(shi)(shi)、隨地(di)進行通訊。使(shi)用方便、節(jie)省成本、節(jie)約(yue)費用。下面我們來了(le)解一下無線(xian)對(dui)(dui)講(jiang)系統(tong)(tong)(tong)(tong)它主要是什么優點(dian)？

1.性(xing)能(neng)穩定，可靠性(xing)高

在(zai)(zai)相同無(wu)線(xian)(xian)(xian)傳輸距(ju)離(li)下，無(wu)線(xian)(xian)(xian)傳輸信(xin)(xin)號(hao)(hao)更穩定(ding)由于使(shi)用(yong)了功率(lv)放(fang)大器來對(dui)(dui)(dui)無(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)(hao)進行(xing)壓縮和(he)(he)放(fang)大，使(shi)無(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)(hao)更加穩定(ding)可靠。無(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)(hao)在(zai)(zai)弱電(dian)(dian)磁環境下也(ye)能(neng)(neng)保持(chi)較好的(de)(de)(de)性(xing)(xing)(xing)能(neng)(neng)。無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)系統(tong)具有(you)發射(she)功率(lv)小、抗(kang)千(qian)(qian)擾(rao)能(neng)(neng)力(li)強(qiang)(與(yu)(yu)有(you)線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)系統(tong)比(bi)較)和(he)(he)抗(kang)電(dian)(dian)磁干擾(rao)能(neng)(neng)力(li)強(qiang)(與(yu)(yu)有(you)線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)系統(tong)比(bi)較)的(de)(de)(de)特點。無(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)系統(tong)發射(she)信(xin)(xin)號(hao)(hao)在(zai)(zai)發射(she)前和(he)(he)發射(she)后均能(neng)(neng)保持(chi)良好的(de)(de)(de)性(xing)(xing)(xing)能(neng)(neng)，使(shi)用(yong)過程(cheng)中，發射(she)信(xin)(xin)號(hao)(hao)與(yu)(yu)接收信(xin)(xin)號(hao)(hao)完全不受任何千(qian)(qian)擾(rao)，可保持(chi)很(hen)好的(de)(de)(de)穩定(ding)性(xing)(xing)(xing)，具有(you)良好的(de)(de)(de)抗(kang)千(qian)(qian)擾(rao)性(xing)(xing)(xing)和(he)(he)抗(kang)低頻干擾(rao)能(neng)(neng)力(li)，即使(shi)在(zai)(zai)惡劣的(de)(de)(de)環境下也(ye)能(neng)(neng)保持(chi)較好的(de)(de)(de)性(xing)(xing)(xing)能(neng)(neng)。因(yin)此無(wu)線(xian)(xian)(xian)系統(tong)有(you)較高的(de)(de)(de)可靠性(xing)(xing)(xing)。

2.功(gong)耗小、不受天氣、濕度的影響(xiang)

無(wu)(wu)線對講(jiang)系統(tong)在不(bu)(bu)(bu)(bu)同(tong)的(de)(de)(de)(de)環(huan)境(jing)中，無(wu)(wu)線通(tong)信(xin)設(she)備(bei)和有線通(tong)信(xin)設(she)備(bei)一(yi)(yi)樣(yang)都要進(jin)行電(dian)能的(de)(de)(de)(de)消(xiao)耗。當(dang)(dang)環(huan)境(jing)溫度在-40°C以下時(shi)，無(wu)(wu)線通(tong)信(xin)設(she)備(bei)需要每(mei)天(tian)工(gong)作8小(xiao)(xiao)(xiao)(xiao)時(shi)左(zuo)(zuo)右(you);當(dang)(dang)環(huan)境(jing)溫度為-20°C時(shi)，每(mei)天(tian)工(gong)作8小(xiao)(xiao)(xiao)(xiao)時(shi)左(zuo)(zuo)右(you);當(dang)(dang)環(huan)境(jing)溫度為-30°C時(shi)，每(mei)天(tian)工(gong)作4小(xiao)(xiao)(xiao)(xiao)時(shi)左(zuo)(zuo)右(you)。目(mu)前市場上常見(jian)的(de)(de)(de)(de)無(wu)(wu)線對講(jiang)系統(tong)有兩種(zhong)電(dian)源(yuan)輸入(ru)方式，一(yi)(yi)種(zhong)是電(dian)源(yuan)輸入(ru)，另一(yi)(yi)種(zhong)是電(dian)源(yuan)輸出(chu)。從這(zhe)兩種(zhong)方式對系統(tong)的(de)(de)(de)(de)功耗來(lai)看，電(dian)源(yuan)輸入(ru)方式的(de)(de)(de)(de)功耗更大一(yi)(yi)些，但是功耗很小(xiao)(xiao)(xiao)(xiao)。并且設(she)備(bei)的(de)(de)(de)(de)工(gong)作環(huan)境(jing)不(bu)(bu)(bu)(bu)同(tong)，對電(dian)池的(de)(de)(de)(de)需求(qiu)量也不(bu)(bu)(bu)(bu)同(tong)，所以功耗也不(bu)(bu)(bu)(bu)同(tong)。

3信號不受干擾

在(zai)(zai)(zai)一(yi)(yi)些有(you)干擾的(de)(de)(de)(de)地(di)方，例如野外、機(ji)場(chang)、工(gong)廠等，一(yi)(yi)般采(cai)(cai)用分頻(pin)(pin)(pin)方式。分頻(pin)(pin)(pin)方式的(de)(de)(de)(de)抗(kang)干擾能(neng)(neng)力(li)不(bu)強，其抗(kang)干擾能(neng)(neng)力(li)主要(yao)取決于射(she)頻(pin)(pin)(pin)功(gong)率的(de)(de)(de)(de)大小。分頻(pin)(pin)(pin)技(ji)術(shu)(shu)(shu)的(de)(de)(de)(de)功(gong)率一(yi)(yi)般是(shi)50dB在(zai)(zai)(zai)50dB左右時，其抗(kang)干擾能(neng)(neng)力(li)強。但由于分頻(pin)(pin)(pin)的(de)(de)(de)(de)干擾與噪(zao)聲(主要(yao)是(shi)周邊噪(zao)聲)具有(you)很強的(de)(de)(de)(de)互通(tong)性，當分頻(pin)(pin)(pin)發(fa)(fa)射(she)的(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)超過(guo)50dB時，其抗(kang)千擾能(neng)(neng)力(li)就會(hui)減(jian)弱。另外，在(zai)(zai)(zai)一(yi)(yi)些有(you)噪(zao)音(yin)的(de)(de)(de)(de)環境中使(shi)(shi)用分頻(pin)(pin)(pin)技(ji)術(shu)(shu)(shu)，會(hui)使(shi)(shi)分頻(pin)(pin)(pin)信(xin)(xin)(xin)號(hao)(hao)(hao)無(wu)法到達(da)發(fa)(fa)射(she)端(duan)(duan)的(de)(de)(de)(de)接收(shou)(shou)機(ji)或者造成發(fa)(fa)射(she)端(duan)(duan)信(xin)(xin)(xin)號(hao)(hao)(hao)與接收(shou)(shou)端(duan)(duan)信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)糟合而(er)造成分頻(pin)(pin)(pin)或干擾(例如在(zai)(zai)(zai)使(shi)(shi)用室外電話時) 。而(er)采(cai)(cai)用分頻(pin)(pin)(pin)技(ji)術(shu)(shu)(shu)的(de)(de)(de)(de)無(wu)線(xian)(xian)對講系統由于發(fa)(fa)射(she)功(gong)率小，分頻(pin)(pin)(pin)后的(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)強度比有(you)線(xian)(xian)對講系統高很多(在(zai)(zai)(zai)實(shi)際使(shi)(shi)用中分頻(pin)(pin)(pin)設備一(yi)(yi)般可以(yi)將(jiang)系統信(xin)(xin)(xin)號(hao)(hao)(hao)分頻(pin)(pin)(pin)到50dB以(yi)上),信(xin)(xin)(xin)號(hao)(hao)(hao)不(bu)受干擾。如果采(cai)(cai)用分頻(pin)(pin)(pin)技(ji)術(shu)(shu)(shu)，需要(yao)在(zai)(zai)(zai)較大的(de)(de)(de)(de)回波功(gong)率下(xia)才能(neng)(neng)實(shi)現信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)(de)分頻(pin)(pin)(pin)工(gong)作(如分頻(pin)(pin)(pin)器發(fa)(fa)射(she)信(xin)(xin)(xin)號(hao)(hao)(hao)與接收(shou)(shou)信(xin)(xin)(xin)號(hao)(hao)(hao)重(zhong)疊時產(chan)生的(de)(de)(de)(de)千擾)和發(fa)(fa)送信(xin)(xin)(xin)號(hao)(hao)(hao)強度降(jiang)低(同頻(pin)(pin)(pin)帶內的(de)(de)(de)(de)兩只天線(xian)(xian)對同一(yi)(yi)信(xin)(xin)(xin)道傳輸的(de)(de)(de)(de)信(xin)(xin)(xin)號(hao)(hao)(hao)強度基本一(yi)(yi)致(zhi));如果采(cai)(cai)用混響技(ji)術(shu)(shu)(shu)，則(ze)可以(yi)實(shi)現對無(wu)線(xian)(xian)信(xin)(xin)(xin)號(hao)(hao)(hao)干擾的(de)(de)(de)(de)抑制或降(jiang)低。