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1、單工無線對(duì)講機(jī)【摘要】單工通信是指在同一時(shí)刻，信息只能單方向進(jìn)行傳輸，簡(jiǎn)而言之就是實(shí)現(xiàn)你說我聽或我說你聽。這種發(fā)射機(jī)和接收機(jī)只能交替工作，不能同時(shí)工作的無線電對(duì)講機(jī)叫做單工機(jī)。發(fā)送原理是把音頻信號(hào)轉(zhuǎn)換成電信號(hào),再通過調(diào)制之后利用特定的頻率范圍發(fā)送出去。接收是利用接收機(jī)對(duì)特定的頻率范圍之內(nèi)收到的信號(hào)通過解調(diào)之后通過揚(yáng)音器發(fā)出收到的信息聲音。單工無線呼叫系統(tǒng)具有使用簡(jiǎn)單、不受網(wǎng)絡(luò)限制、通話成本低、適用范圍廣等優(yōu)點(diǎn)。它是在鑒頻、混頻等技術(shù)的基礎(chǔ)上，利用無線電通信原理研發(fā)的一種通信方式。本文從無線對(duì)講機(jī)的基本原理出發(fā)，并對(duì)各部分的功能和作用進(jìn)行了分析和研究，確定了對(duì)講機(jī)電路
2、圖。本系統(tǒng)的功能在于實(shí)現(xiàn)呼叫和通話功能。無線對(duì)講電話的特點(diǎn)是可供小型單位作內(nèi)部電話使用，此外由于采用成品電路模塊,從而使制作變得很簡(jiǎn)單,成本也很低。雖然通信質(zhì)量不太好信噪比不高，通信距離短。但是，它不依賴成網(wǎng)通訊或基站通訊，簡(jiǎn)單地實(shí)現(xiàn)了內(nèi)部的通話，為人們的日常生活帶來了極大的方便，值得進(jìn)一步推廣，有很好的發(fā)展前景，廣泛地運(yùn)用于軍事和民用領(lǐng)域。如城市交通管制，大型運(yùn)動(dòng)館秩序維護(hù)管理，小區(qū)物業(yè)管理，工廠調(diào)度管理，建筑工地的協(xié)調(diào)施工等各個(gè)領(lǐng)域，下面以一個(gè)簡(jiǎn)易的單工對(duì)講機(jī)為例?！娟P(guān)鍵詞】無線呼叫調(diào)頻發(fā)射振蕩電路XX[Abstract]Thetransmissionprinc
3、ipleistransformsthetonictrainsignallingtheelectricalsignal,againaftermodulationusesthespecificfrequencyrangetotransmit.Thereceiveisusesthereceiverthesignalwhichreceivestothespecificfrequencyrangeinafterthedemodulationmakestheinformationsoundthroughthemicrophonewhichreceives.picktransit
4、ionshaveusewirelesscallsystemsimple,notaffectedbynetworkrestrictions,calllowcost,wideapplication,etc.Itispopularlyusedinfrequencymixingtechnology,onthebasisofusingradiocommunicationprincipleofakindofcommunicationresearch.Thispaperbasedonthebasicprincipleofwirelessradio,andpartofthefunc
5、tionandeffectareanalyzedandstudied,determinestheintercomdiagram.Thefunctionofthissystemistorealizecallandcallfunctions.Thecharacteristicsofwirelesstalkbacktelephoneisavailableforsmallunitsforinternaluse,moreoverduetothetelephonefinishedproduct,thusmakewirelessmodulebecomesverysimple,th
6、ecostislow.Althoughthecommunicationqualityisnotsogoodsignaltonoiseratioisnothigh,shortcommunicationdistance.However,itdoesnotrelyonnetworkcommunicationorthebasestationcommunications,simpletorealizetheinternalcall,toprovidepeoplewithmorecomfortableandperfectwayoflife,Itisworthtofurtherp
7、romote,haveverygooddevelopmentprospect.Widelyusedinmilitaryandcivilfields.Suchascitytrafficcontrol,largesportshallordermaintenancemanagement,propertymanagement,plantmanagement,constructionsitetocoordinateconstructionandotherfields,thefollowingtoasimplesimplexradioasanexample.XX[keywo
