由(you)于在(zai)(zai)戶(hu)外(wai)、室內等(deng)區(qu)域，無(wu)線(xian)(xian)對(dui)講(jiang)系統(tong)(tong)(tong)的(de)信(xin)(xin)號強度較弱，而且采用(yong)(yong)(yong)頻率調制技術（如 MHZ、 NMR、 BSI等(deng)）產生的(de)信(xin)(xin)號傳輸時延大，傳輸距(ju)離(li)遠(yuan)。因此有(you)(you)線(xian)(xian)對(dui)講(jiang)系統(tong)(tong)(tong)不適合在(zai)(zai)戶(hu)外(wai)環境(jing)(jing)使(shi)(shi)用(yong)(yong)(yong)，特別(bie)是在(zai)(zai)冬天及低風速季節使(shi)(shi)用(yong)(yong)(yong)。雖然無(wu)線(xian)(xian)對(dui)講(jiang)系統(tong)(tong)(tong)也(ye)有(you)(you)著(zhu)不錯的(de)效(xiao)果。但由(you)于系統(tong)(tong)(tong)工作時會有(you)(you)一(yi)定的(de)干擾，使(shi)(shi)對(dui)講(jiang)效(xiao)果下降(jiang)，另外(wai)在(zai)(zai)信(xin)(xin)號較弱時對(dui)用(yong)(yong)(yong)戶(hu)語音產生了(le)影響。特別(bie)是在(zai)(zai)人員復雜(za)、通信(xin)(xin)距(ju)離(li)較短或需要(yao)(yao)較長(chang)時間使(shi)(shi)用(yong)(yong)(yong)時。因此，更需要(yao)(yao)有(you)(you)一(yi)個可靠的(de)無(wu)線(xian)(xian)對(dui)講(jiang)系統(tong)(tong)(tong)提供與(yu)有(you)(you)線(xian)(xian)對(dui)講(jiang)系統(tong)(tong)(tong)一(yi)樣的(de)語音信(xin)(xin)息與(yu)控制。無(wu)線(xian)(xian)對(dui)講(jiang)系統(tong)(tong)(tong)具有(you)(you)很高的(de)靈活性，它能夠滿足現場(chang)中所有(you)(you)環境(jing)(jing)使(shi)(shi)用(yong)(yong)(yong)需求并(bing)能隨(sui)時切換（如在(zai)(zai)野(ye)外(wai)、戶(hu)外(wai)電話等(deng)),用(yong)(yong)(yong)戶(hu)可以在(zai)(zai)任何(he)地點使(shi)(shi)用(yong)(yong)(yong)、隨(sui)時、隨(sui)地進行通訊。使(shi)(shi)用(yong)(yong)(yong)方便、節省成本(ben)、節約費(fei)用(yong)(yong)(yong)。下面我(wo)們來了(le)解一(yi)下無(wu)線(xian)(xian)對(dui)講(jiang)系統(tong)(tong)(tong)它主要(yao)(yao)是什(shen)么優點？

1.性能穩(wen)定，可(ke)靠性高

在相(xiang)同無(wu)(wu)線(xian)(xian)(xian)傳(chuan)輸距離下，無(wu)(wu)線(xian)(xian)(xian)傳(chuan)輸信(xin)(xin)號(hao)(hao)更穩(wen)定(ding)由于使用(yong)(yong)了功(gong)率(lv)放大(da)器來對(dui)無(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)(hao)進行壓縮(suo)和(he)放大(da)，使無(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)(hao)更加穩(wen)定(ding)可(ke)(ke)靠。無(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)(hao)在弱電(dian)磁環境(jing)下也(ye)能(neng)(neng)保(bao)(bao)(bao)持(chi)較(jiao)(jiao)好(hao)的(de)(de)性(xing)(xing)能(neng)(neng)。無(wu)(wu)線(xian)(xian)(xian)對(dui)講系(xi)統(tong)(tong)具有(you)發射(she)功(gong)率(lv)小、抗(kang)(kang)千(qian)擾能(neng)(neng)力(li)強(與有(you)線(xian)(xian)(xian)對(dui)講系(xi)統(tong)(tong)比(bi)較(jiao)(jiao))和(he)抗(kang)(kang)電(dian)磁干擾能(neng)(neng)力(li)強(與有(you)線(xian)(xian)(xian)對(dui)講系(xi)統(tong)(tong)比(bi)較(jiao)(jiao))的(de)(de)特點。無(wu)(wu)線(xian)(xian)(xian)對(dui)講系(xi)統(tong)(tong)發射(she)信(xin)(xin)號(hao)(hao)在發射(she)前和(he)發射(she)后(hou)均能(neng)(neng)保(bao)(bao)(bao)持(chi)良好(hao)的(de)(de)性(xing)(xing)能(neng)(neng)，使用(yong)(yong)過程中，發射(she)信(xin)(xin)號(hao)(hao)與接(jie)收(shou)信(xin)(xin)號(hao)(hao)完全不(bu)受任何千(qian)擾，可(ke)(ke)保(bao)(bao)(bao)持(chi)很好(hao)的(de)(de)穩(wen)定(ding)性(xing)(xing)，具有(you)良好(hao)的(de)(de)抗(kang)(kang)千(qian)擾性(xing)(xing)和(he)抗(kang)(kang)低頻干擾能(neng)(neng)力(li)，即使在惡劣的(de)(de)環境(jing)下也(ye)能(neng)(neng)保(bao)(bao)(bao)持(chi)較(jiao)(jiao)好(hao)的(de)(de)性(xing)(xing)能(neng)(neng)。因此無(wu)(wu)線(xian)(xian)(xian)系(xi)統(tong)(tong)有(you)較(jiao)(jiao)高的(de)(de)可(ke)(ke)靠性(xing)(xing)。

2.功耗小、不(bu)受(shou)天(tian)氣、濕度的影響

無(wu)(wu)線(xian)(xian)對講系統在不(bu)(bu)(bu)(bu)同(tong)的(de)(de)(de)(de)環境中(zhong)，無(wu)(wu)線(xian)(xian)通(tong)信設(she)備(bei)和有(you)線(xian)(xian)通(tong)信設(she)備(bei)一(yi)樣都要進(jin)行(xing)電能的(de)(de)(de)(de)消(xiao)耗(hao)。當環境溫度在-40°C以下(xia)時(shi)，無(wu)(wu)線(xian)(xian)通(tong)信設(she)備(bei)需(xu)要每天工(gong)作8小(xiao)時(shi)左(zuo)右;當環境溫度為(wei)-20°C時(shi)，每天工(gong)作8小(xiao)時(shi)左(zuo)右;當環境溫度為(wei)-30°C時(shi)，每天工(gong)作4小(xiao)時(shi)左(zuo)右。目前市場上(shang)常見的(de)(de)(de)(de)無(wu)(wu)線(xian)(xian)對講系統有(you)兩種電源(yuan)(yuan)輸(shu)入方式(shi)，一(yi)種是(shi)電源(yuan)(yuan)輸(shu)入，另一(yi)種是(shi)電源(yuan)(yuan)輸(shu)出。從這(zhe)兩種方式(shi)對系統的(de)(de)(de)(de)功耗(hao)來看，電源(yuan)(yuan)輸(shu)入方式(shi)的(de)(de)(de)(de)功耗(hao)更大(da)一(yi)些，但是(shi)功耗(hao)很小(xiao)。并(bing)且設(she)備(bei)的(de)(de)(de)(de)工(gong)作環境不(bu)(bu)(bu)(bu)同(tong)，對電池的(de)(de)(de)(de)需(xu)求(qiu)量也不(bu)(bu)(bu)(bu)同(tong)，所(suo)以功耗(hao)也不(bu)(bu)(bu)(bu)同(tong)。

3信號不受干擾

在一(yi)(yi)些有干(gan)(gan)擾的(de)(de)地方，例如野(ye)外、機場(chang)、工廠等，一(yi)(yi)般(ban)采用(yong)(yong)(yong)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)方式。分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)方式的(de)(de)抗(kang)干(gan)(gan)擾能(neng)力(li)(li)不(bu)強，其抗(kang)干(gan)(gan)擾能(neng)力(li)(li)主(zhu)要取決于(yu)(yu)射(she)(she)頻(pin)(pin)(pin)(pin)(pin)(pin)功(gong)率(lv)的(de)(de)大小。分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)的(de)(de)功(gong)率(lv)一(yi)(yi)般(ban)是50dB在50dB左右時，其抗(kang)干(gan)(gan)擾能(neng)力(li)(li)強。但由(you)于(yu)(yu)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)的(de)(de)干(gan)(gan)擾與噪(zao)聲(sheng)(主(zhu)要是周邊(bian)噪(zao)聲(sheng))具有很強的(de)(de)互通性，當(dang)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)發(fa)射(she)(she)的(de)(de)信(xin)(xin)(xin)號(hao)(hao)超(chao)過50dB時，其抗(kang)千擾能(neng)力(li)(li)就(jiu)會(hui)減弱。另外，在一(yi)(yi)些有噪(zao)音的(de)(de)環(huan)境中(zhong)使(shi)用(yong)(yong)(yong)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)，會(hui)使(shi)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)信(xin)(xin)(xin)號(hao)(hao)無(wu)法到達(da)發(fa)射(she)(she)端的(de)(de)接收(shou)機或(huo)者造成發(fa)射(she)(she)端信(xin)(xin)(xin)號(hao)(hao)與接收(shou)端信(xin)(xin)(xin)號(hao)(hao)的(de)(de)糟合而(er)造成分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)或(huo)干(gan)(gan)擾(例如在使(shi)用(yong)(yong)(yong)室外電話(hua)時) 。而(er)采用(yong)(yong)(yong)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)的(de)(de)無(wu)線(xian)對講系統(tong)由(you)于(yu)(yu)發(fa)射(she)(she)功(gong)率(lv)小，分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)后的(de)(de)信(xin)(xin)(xin)號(hao)(hao)強度(du)比有線(xian)對講系統(tong)高很多(duo)(在實際使(shi)用(yong)(yong)(yong)中(zhong)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)設備(bei)一(yi)(yi)般(ban)可(ke)以將系統(tong)信(xin)(xin)(xin)號(hao)(hao)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)到50dB以上),信(xin)(xin)(xin)號(hao)(hao)不(bu)受干(gan)(gan)擾。如果(guo)采用(yong)(yong)(yong)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)技術(shu)，需要在較(jiao)大的(de)(de)回波功(gong)率(lv)下才能(neng)實現信(xin)(xin)(xin)號(hao)(hao)的(de)(de)分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)工作(如分(fen)頻(pin)(pin)(pin)(pin)(pin)(pin)器發(fa)射(she)(she)信(xin)(xin)(xin)號(hao)(hao)與接收(shou)信(xin)(xin)(xin)號(hao)(hao)重(zhong)疊(die)時產生的(de)(de)千擾)和發(fa)送(song)信(xin)(xin)(xin)號(hao)(hao)強度(du)降(jiang)低(di)(同(tong)頻(pin)(pin)(pin)(pin)(pin)(pin)帶內的(de)(de)兩只天(tian)線(xian)對同(tong)一(yi)(yi)信(xin)(xin)(xin)道傳輸(shu)的(de)(de)信(xin)(xin)(xin)號(hao)(hao)強度(du)基(ji)本一(yi)(yi)致);如果(guo)采用(yong)(yong)(yong)混響技術(shu)，則(ze)可(ke)以實現對無(wu)線(xian)信(xin)(xin)(xin)號(hao)(hao)干(gan)(gan)擾的(de)(de)抑制或(huo)降(jiang)低(di)。