ndoverallleadershipresponsibilityforsafety.AdministrativeDeputyiswithinthescopeoftheirrespectiveresponsibilitiesatvariouslevelsofsecurityresponsibility,inchargeofsecurityworkinthecontextofleadership,responsibletotheChief.Fifthopenpitproductionsafetyaccidentinvestigationsystem,performedonaproductionsafetyaccident\oductionsafetyaccidentreportstepbystepreportingthreechannels,namely,UnitChief,administrationandsafetysupervisionsystemcounterparttosuperiorleadership,reportsinatimelymanner.Sixthpitmustimplementthe\nchargeofwho'sincharge\besafe\nning,layout,checkproductionwork,summarizedandevaluatedatthesametime,plans,features,review,summary,ratingsafetywork.Firmlyestablishing\ness,safetyisthecredibility,safetyisthecompetitiveness\ss,tomakesafetywork.Seventhminingtradeunionorganizationaccordingtolawtheworkerstoparticipateintheworksafetyofdemocraticmanagementanddemocraticsupervision,safeguardworkers'legitimaterightsandinterestsinrespectofsafety.PersonaldeathandaTradeUnionhastherighttoparticipateinthemajoraccidentinvestigations,relyonthemassestodoproductionsafetywork.Eighthpitmustbebasedonrelevantlawsandregulations,industrystandardsandcompanyandGod'sstandards,rulesandregulationsissuedbythecompany,developingrulesandregulationsforcoalproduction,institutionalizationan功率增强器。直放站在下行链路中，由施主天线现有的覆盖区域中拾取信号，通过带通滤波器对带通外的信号进行极好的隔离，将滤波的信号经功放放大后再次发射到待覆盖区域。在上行链接路径中，覆盖区域内的移动台手机的信号以同样的工作方式由上行放大链路处理后发射到相应基站，从而达到基地站与手机的信号传递。
直放站是一种中继产品，衡量直放站好坏的指标主要有，智能化程度（如远程监控等）、低IP3（无委规定小于-36dBm）、低噪声系数(NF)、整机可靠性、良好的技术服务等。
使用直放站作为实现“小容量、大覆盖”目标的必要手段之一，主要是由于使用直放站一是在不增加基站数量的前提下保证网络覆盖，二是其造价远远低于有同样效果的微蜂窝系统。直放站是解决通信网络延伸覆盖能力的一种优选方案。它与基站相比有结构简单、投资较少和安装方便等优点，可广泛用于难于覆盖的盲区和弱区，如商场、宾馆、机场、码头、车站、体育馆、娱乐厅、地铁、隧道、高速公路、海岛等各种场所，提高通信质量，解决掉话等问题。
2.直放站系统
2.1直放站的种类与类型
(1) 移动通信直放站的种类
--- 从传输信号分有GSM直放站和CDMA直放站; --- 从安装场所来分有室外型机和室内型机;
--- 从传输带宽来分有宽带直放站和选频（选信道）直放
ndoverallleadershipresponsibilityforsafety.AdministrativeDeputyiswithinthescopeoftheirrespectiveresponsibilitiesatvariouslevelsofsecurityresponsibility,inchargeofsecurityworkinthecontextofleadership,responsibletotheChief.Fifthopenpitproductionsafetyaccidentinvestigationsystem,performedonaproductionsafetyaccident\posedonproductionsafetyaccidentreportstepbystepreportingthreechannels,namely,UnitChief,administrationandsafetysupervisionsystemcounterparttosuperiorleadership,reportsinatimelymanner.Sixthpitmustimplementthe\nchargeofwho'sincharge\besafe\nning,layout,checkproductionwork,summarizedandevaluatedatthesametime,plans,features,review,summary,ratingsafetywork.Firmlyestablishing\ness,safetyisthecredibility,safetyisthecompetitiveness\ss,tomakesafetywork.Seventhminingtradeunionorganizationaccordingtolawtheworkerstoparticipateintheworksafetyofdemocraticmanagementanddemocraticsupervision,safeguardworkers'legitimaterightsandinterestsinrespectofsafety.PersonaldeathandaTradeUnionhastherighttoparticipateinthemajoraccidentinvestigations,relyonthemassestodoproductionsafetywork.Eighthpitmustbebasedonrelevantlawsandregulations,industrystandardsandcompanyandGod'sstandards,rulesandregulationsissuedbythecompany,developingrulesandregulationsforcoalproduction,institutionalizationan 站;
--- 从传输方式来分有直放式直放站、光纤传输直放站和移频传输直放站。
按信号传输方式划分，直放站分为：
1.光纤直放站 2.移频直放站 3.微波直放站 4.射频直放站
2.1.1光纤直放站
将来自基站的射频信号转换为光信号后传输给直放站
然后直放站将接收到的光信号重新转换为射频信号后再传输给移动台
·适用区域
分散在市区、市区出口覆盖盲区等信号不良地区 ·特点
使用光纤连接可以提供可靠的通话
但对于长距离光纤传输，会因为迟延降低通话质量 2.1.2移频直放站
移频直放站可以将基站的1到3个工作载频转变为1到3个CDMA非工作载频信号后，再传输给移频直放站。移频直放站接收到信号后，重新将信号转换为基站的工作载频 ·适用区域
移频直放站可以用于在3个载频或更小的服务区，清除信号盲区和信号不连续区，提高信号覆盖区
ndoverallleadershipresponsibilityforsafety.AdministrativeDeputyiswithinthescopeoftheirrespectiveresponsibilitiesatvariouslevelsofsecurityresponsibility,inchargeofsecurityworkinthecontextofleadership,responsibletotheChief.Fifthopenpitproductionsafetyaccidentinvestigationsystem,performedonaproductionsafetyaccident\dentreportstepbystepreportingthreechannels,namely,UnitChief,administrationandsafetysupervisionsystemcounterparttosuperiorleadership,reportsinatimelymanner.Sixthpitmustimplementthe\nchargeofwho'sincharge\besafe\nning,layout,checkproductionwork,summarizedandevaluatedatthesametime,plans,features,review,summary,ratingsafetywork.Firmlyestablishing\ness,safetyisthecredibility,safetyisthecompetitiveness\ss,tomakesafetywork.Seventhminingtradeunionorganizationaccordingtolawtheworkerstoparticipateintheworksafetyofdemocraticmanagementanddemocraticsupervision,safeguardworkers'legitimaterightsandinterestsinrespectofsafety.PersonaldeathandaTradeUnionhastherighttoparticipateinthemajoraccidentinvestigations,relyonthemassestodoproductionsafetywork.Eighthpitmustbebasedonrelevantlawsandregulations,industrystandardsandcompanyandGod'sstandards,rulesandregulationsissuedbythecompany,developingrulesandregulationsforcoalproduction,institutionalizationan·特点
移频直放站可以使用在复杂地形中，并能解决射频直放站的收发隔离问题
2.1.3微波直放站(MMC) 利用微波来连接基站和直放站 ·适用区域
清除盲区和信号不良区，并提高覆盖区域内信号质量 ·特点
容易安装和维护，但只能视距传播 2.1.4射频直放站
射频直放站可以直接接收来自基站的射频信号,并放大传输给移动台 ·适用区域
射频直放站可以清除在建筑物内，隧道和地下环境的信号盲区 ·特点
射频直放站使用非常经济，但是由于Tx和Rx的信号隔离度以及对施主基站的干扰问题，使射频直放站的应用受到很大的限制。
2.2移动通信直放站的构成
2.2.1 GSM移动通信直放站
GSM移动通信直放站是解决基站覆盖而存在信号盲区的一种方式。通过架设直放站不但能改善覆盖效果，同时能大大减少投资基站之成本。