由于(yu)在(zai)(zai)戶(hu)外(wai)(wai)、室內等(deng)區域，無(wu)線(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統的信(xin)(xin)號強度較(jiao)(jiao)弱，而(er)且采用(yong)(yong)(yong)(yong)頻率(lv)調制技術（如 MHZ、 NMR、 BSI等(deng)）產(chan)生的信(xin)(xin)號傳輸時(shi)延大，傳輸距離(li)遠。因此有(you)線(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統不(bu)適合(he)在(zai)(zai)戶(hu)外(wai)(wai)環(huan)境使(shi)用(yong)(yong)(yong)(yong)，特別是(shi)在(zai)(zai)冬天及低風速季節(jie)使(shi)用(yong)(yong)(yong)(yong)。雖然(ran)無(wu)線(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統也有(you)著不(bu)錯的效果。但由于(yu)系(xi)(xi)統工作時(shi)會有(you)一(yi)定的干擾，使(shi)對(dui)(dui)(dui)講(jiang)(jiang)效果下(xia)降，另外(wai)(wai)在(zai)(zai)信(xin)(xin)號較(jiao)(jiao)弱時(shi)對(dui)(dui)(dui)用(yong)(yong)(yong)(yong)戶(hu)語音產(chan)生了影響。特別是(shi)在(zai)(zai)人(ren)員(yuan)復雜(za)、通(tong)信(xin)(xin)距離(li)較(jiao)(jiao)短或需(xu)要(yao)(yao)較(jiao)(jiao)長時(shi)間(jian)使(shi)用(yong)(yong)(yong)(yong)時(shi)。因此，更需(xu)要(yao)(yao)有(you)一(yi)個可(ke)靠的無(wu)線(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統提供與有(you)線(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統一(yi)樣的語音信(xin)(xin)息與控(kong)制。無(wu)線(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統具有(you)很高(gao)的靈活性，它能(neng)夠滿足現場中所有(you)環(huan)境使(shi)用(yong)(yong)(yong)(yong)需(xu)求并能(neng)隨(sui)時(shi)切換(huan)（如在(zai)(zai)野外(wai)(wai)、戶(hu)外(wai)(wai)電話(hua)等(deng)),用(yong)(yong)(yong)(yong)戶(hu)可(ke)以在(zai)(zai)任(ren)何地點使(shi)用(yong)(yong)(yong)(yong)、隨(sui)時(shi)、隨(sui)地進行通(tong)訊(xun)。使(shi)用(yong)(yong)(yong)(yong)方便、節(jie)省成本、節(jie)約費(fei)用(yong)(yong)(yong)(yong)。下(xia)面我們來了解一(yi)下(xia)無(wu)線(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)系(xi)(xi)統它主要(yao)(yao)是(shi)什么優點？

1.性能穩定，可(ke)靠(kao)性高

在(zai)(zai)相同無(wu)(wu)線(xian)(xian)(xian)傳(chuan)輸(shu)距離下，無(wu)(wu)線(xian)(xian)(xian)傳(chuan)輸(shu)信(xin)(xin)號(hao)(hao)(hao)更穩定(ding)由于使(shi)用(yong)(yong)了功率放大器來對(dui)(dui)無(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)(hao)(hao)進(jin)行壓縮和放大，使(shi)無(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)(hao)(hao)更加穩定(ding)可靠(kao)。無(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)(hao)(hao)在(zai)(zai)弱電(dian)磁(ci)環境下也(ye)能(neng)(neng)保(bao)(bao)持(chi)較好的(de)(de)性(xing)能(neng)(neng)。無(wu)(wu)線(xian)(xian)(xian)對(dui)(dui)講(jiang)系統(tong)(tong)具有(you)(you)發(fa)射(she)功率小、抗(kang)(kang)千擾能(neng)(neng)力(li)強(與有(you)(you)線(xian)(xian)(xian)對(dui)(dui)講(jiang)系統(tong)(tong)比(bi)較)和抗(kang)(kang)電(dian)磁(ci)干(gan)擾能(neng)(neng)力(li)強(與有(you)(you)線(xian)(xian)(xian)對(dui)(dui)講(jiang)系統(tong)(tong)比(bi)較)的(de)(de)特點。無(wu)(wu)線(xian)(xian)(xian)對(dui)(dui)講(jiang)系統(tong)(tong)發(fa)射(she)信(xin)(xin)號(hao)(hao)(hao)在(zai)(zai)發(fa)射(she)前和發(fa)射(she)后均能(neng)(neng)保(bao)(bao)持(chi)良好的(de)(de)性(xing)能(neng)(neng)，使(shi)用(yong)(yong)過程中，發(fa)射(she)信(xin)(xin)號(hao)(hao)(hao)與接收信(xin)(xin)號(hao)(hao)(hao)完全不受(shou)任何千擾，可保(bao)(bao)持(chi)很好的(de)(de)穩定(ding)性(xing)，具有(you)(you)良好的(de)(de)抗(kang)(kang)千擾性(xing)和抗(kang)(kang)低頻干(gan)擾能(neng)(neng)力(li)，即使(shi)在(zai)(zai)惡(e)劣的(de)(de)環境下也(ye)能(neng)(neng)保(bao)(bao)持(chi)較好的(de)(de)性(xing)能(neng)(neng)。因此無(wu)(wu)線(xian)(xian)(xian)系統(tong)(tong)有(you)(you)較高(gao)的(de)(de)可靠(kao)性(xing)。

2.功耗(hao)小、不受天氣、濕度的影(ying)響

無線(xian)對(dui)(dui)(dui)講(jiang)系(xi)統在不同(tong)的(de)(de)(de)環(huan)境中，無線(xian)通(tong)(tong)信設備(bei)和有(you)線(xian)通(tong)(tong)信設備(bei)一(yi)樣(yang)都要進行電(dian)能的(de)(de)(de)消耗(hao)(hao)。當(dang)環(huan)境溫度在-40°C以下時(shi)，無線(xian)通(tong)(tong)信設備(bei)需(xu)(xu)要每天(tian)工(gong)(gong)作8小時(shi)左右;當(dang)環(huan)境溫度為(wei)-20°C時(shi)，每天(tian)工(gong)(gong)作8小時(shi)左右;當(dang)環(huan)境溫度為(wei)-30°C時(shi)，每天(tian)工(gong)(gong)作4小時(shi)左右。目前市(shi)場上常見的(de)(de)(de)無線(xian)對(dui)(dui)(dui)講(jiang)系(xi)統有(you)兩種電(dian)源(yuan)(yuan)輸(shu)入(ru)方式，一(yi)種是電(dian)源(yuan)(yuan)輸(shu)入(ru)，另一(yi)種是電(dian)源(yuan)(yuan)輸(shu)出。從這兩種方式對(dui)(dui)(dui)系(xi)統的(de)(de)(de)功(gong)耗(hao)(hao)來看，電(dian)源(yuan)(yuan)輸(shu)入(ru)方式的(de)(de)(de)功(gong)耗(hao)(hao)更大一(yi)些，但(dan)是功(gong)耗(hao)(hao)很小。并且(qie)設備(bei)的(de)(de)(de)工(gong)(gong)作環(huan)境不同(tong)，對(dui)(dui)(dui)電(dian)池的(de)(de)(de)需(xu)(xu)求量也(ye)不同(tong)，所以功(gong)耗(hao)(hao)也(ye)不同(tong)。

3信號不受干擾

在(zai)(zai)一(yi)(yi)些(xie)有干(gan)擾(rao)的(de)(de)(de)(de)(de)地方，例如野外、機場、工廠等，一(yi)(yi)般(ban)采(cai)(cai)用(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)方式。分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)方式的(de)(de)(de)(de)(de)抗(kang)干(gan)擾(rao)能力(li)(li)不(bu)強(qiang)，其(qi)抗(kang)干(gan)擾(rao)能力(li)(li)主(zhu)要取決于(yu)(yu)射(she)頻(pin)(pin)(pin)(pin)(pin)(pin)功率(lv)的(de)(de)(de)(de)(de)大小(xiao)。分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)(shu)的(de)(de)(de)(de)(de)功率(lv)一(yi)(yi)般(ban)是50dB在(zai)(zai)50dB左右時(shi)(shi)，其(qi)抗(kang)干(gan)擾(rao)能力(li)(li)強(qiang)。但由(you)于(yu)(yu)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)的(de)(de)(de)(de)(de)干(gan)擾(rao)與(yu)噪(zao)聲(主(zhu)要是周(zhou)邊噪(zao)聲)具有很強(qiang)的(de)(de)(de)(de)(de)互通性，當分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)發(fa)射(she)的(de)(de)(de)(de)(de)信(xin)號超過50dB時(shi)(shi)，其(qi)抗(kang)千(qian)擾(rao)能力(li)(li)就(jiu)會減弱。另(ling)外，在(zai)(zai)一(yi)(yi)些(xie)有噪(zao)音的(de)(de)(de)(de)(de)環(huan)境中(zhong)使用(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)(shu)，會使分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)信(xin)號無法到達發(fa)射(she)端的(de)(de)(de)(de)(de)接收機或(huo)者(zhe)造成發(fa)射(she)端信(xin)號與(yu)接收端信(xin)號的(de)(de)(de)(de)(de)糟合(he)而造成分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)或(huo)干(gan)擾(rao)(例如在(zai)(zai)使用(yong)(yong)室外電話時(shi)(shi)) 。而采(cai)(cai)用(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)(shu)的(de)(de)(de)(de)(de)無線(xian)對(dui)講(jiang)系統(tong)由(you)于(yu)(yu)發(fa)射(she)功率(lv)小(xiao)，分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)后的(de)(de)(de)(de)(de)信(xin)號強(qiang)度比有線(xian)對(dui)講(jiang)系統(tong)高很多(在(zai)(zai)實(shi)際使用(yong)(yong)中(zhong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)設(she)備一(yi)(yi)般(ban)可以將(jiang)系統(tong)信(xin)號分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)到50dB以上),信(xin)號不(bu)受(shou)干(gan)擾(rao)。如果(guo)采(cai)(cai)用(yong)(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)(shu)，需要在(zai)(zai)較大的(de)(de)(de)(de)(de)回(hui)波(bo)功率(lv)下才能實(shi)現(xian)信(xin)號的(de)(de)(de)(de)(de)分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)工作(如分(fen)(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)器發(fa)射(she)信(xin)號與(yu)接收信(xin)號重疊時(shi)(shi)產生(sheng)的(de)(de)(de)(de)(de)千(qian)擾(rao))和發(fa)送信(xin)號強(qiang)度降低(di)(同頻(pin)(pin)(pin)(pin)(pin)(pin)帶內的(de)(de)(de)(de)(de)兩(liang)只天(tian)線(xian)對(dui)同一(yi)(yi)信(xin)道傳(chuan)輸的(de)(de)(de)(de)(de)信(xin)號強(qiang)度基(ji)本(ben)一(yi)(yi)致);如果(guo)采(cai)(cai)用(yong)(yong)混響技術(shu)(shu)，則可以實(shi)現(xian)對(dui)無線(xian)信(xin)號干(gan)擾(rao)的(de)(de)(de)(de)(de)抑(yi)制或(huo)降低(di)。