95_54_EC(1995) 防范当引擎火星点火时的电波干扰
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业余无线电操作证书考试A类题库(**标记为正确答案)1 [Q]我国现行法律体系中专门针对无线电管理的最高法律文件及其立法机关是:*[A]中华人民共和国无线电管理条例,国务院和中央军委*2 [Q]我国现行法律体系中专门针对业余无线电台管理的最高法律文件及其立法机关是:*[A]业余无线电台管理办法,工业和信息化部*3 [Q]我国的无线电主管部门是:*[A]各级无线电管理机构*4 [Q]我国依法负责对业余无线电台实施监督管理的机构是:*[A]国家无线电管理机构和地方无线电管理机构*5 [Q]《业余无线电台管理办法》所说的“地方无线电管理机构”指的是:*[A]省、自治区、直辖市无线电管理机构*6 [Q]国家鼓励和支持业余无线电台开展下列活动:*[A]无线电通信技术研究、普及活动以及突发重大自然灾害等紧急情况下的应急通信活动*7 [Q]关于业余电台管理的正确说法是:*[A]依法设置的业余无线电台受国家法律保护*8 [Q]无线电频率的使用必须得到各级无线电管理机构的批准,基本依据是“无线电频谱资源属于国家所有”,出自于下列法律:*[A]中华人民共和国物权法*9 [Q]我国对无线电管理术语“业余业务”、“卫星业余业务”和“业余无线电台”做出具体定义的法规文件是*[A]中华人民共和国无线电频率划分规定*10 [Q]业余电台的法定用途为:*[A]供业余无线电爱好者进行自我训练、相互通信和技术研究*11 [Q]无线电业余业务是供业余无线电爱好者作下列用途的无线电通信业务:*[A]自我训练、相互通信和技术研究*12 [Q]业余无线电台供下列人群设置和使用:*[A]业余无线电爱好者,即经正式批准的、对无线电技术有兴趣的人,其兴趣纯系个人爱好而不涉及谋取利润*13 [Q]“我不是业余无线电爱好者,申请设置业余电台只是为了行车方便,不需要遵守业余无线电的规范”。
这种说法:*[A]是错误的,也是不具备“熟悉无线电管理规定”设台条件的表现*14 [Q]个人提出设置使用业余无线电台申请,就是表示自己对无线电技术发生了兴趣,确认了自己在有关业余无线电台活动中的身份是:*[A]业余无线电爱好者,但可以是正在起步的初学者*15 [Q]符合业余无线电爱好者基本条件的人群是:*[A]对无线电技术有兴趣并经无线电管理机构批准设置使用业余无线电台的人*16 [Q]不同类别业余无线电台的主要区别在于:*[A]允许发射的频率范围和最大发射功率*17 [Q]A类业余无线电台允许发射的发射频率为:*[A]30-3000MHz范围内的各业余业务和卫星业余业务频段*18 [Q]A类业余无线电台允许发射的最大发射功率为不大于:*[A]25瓦*19 [Q]个人申请设置具有发信功能的业余无线电台的年龄条件是:*[A]年满十八周岁*20 [Q]独立操作具有发信功能业余无线电台的年龄条件是:*[A]具备《业余无线电台操作证书》者操作业余无线电台不受年龄限制*21 [Q]申请设置业余无线电台应当具备的条件有:*[A]熟悉无线电管理规定、具备国家规定的操作技术能力、发射设备符合国家技术标准、法律和行政法规规定的其他条件*22 [Q]使用业余无线电台应当具备的条件有:*[A]熟悉无线电管理规定、具备国家规定的操作技术能力并取得相应操作技术能力证明*23 [Q]负责组织A类和B类业余无线电台所需操作技术能力的验证的机构是:*[A]国家无线电管理机构和地方无线电管理机构(或其委托单位)*24 [Q]2013年1月1日以后新获得的各类业余无线电台操作技术能力证明文件是:*[A]中国无线电协会颁发的“业余无线电台操作证书”*25 [Q]申请设置和使用业余无线电台的条件所规定的“具备国家规定的操作技术能力”,其标志为:*[A]取得相应操作技术能力证明,即中国无线电协会颁发的业余无线电台操作证书*26 [Q]合法设置业余电台的必要步骤是:*[A]按《业余无线电台管理办法》的规定办理设置审批手续,并取得业余电台执照*27 [Q]按照《业余电台管理办法》规定,申请设置使用配备有多台业余无线电发射设备的业余无线电台,应该:*[A]视为一个业余电台,指配一个电台呼号,但所有设备均应经过核定并将参数载入电台执照*28 [Q]个人申请设置业余无线电台应当提交的书面材料为:*[A]两种表格,身份证和操作证书的原件、复印件*29 [Q]申请设置下列业余无线电台时应在《业余无线电台设置(变更)申请表》的“台站种类”选择“特殊”类:*[A]中继台、信标台、空间台*30 [Q]申请设置信标台、空间台和技术参数需要超出管理办法规定的特殊业余电台的办法为:*[A]在《业余无线电台设置(变更)申请表》的“台站种类”选择“特殊”类,由地方无线电管理机构受理和初审后交国家无线电管理机构审批*31 [Q]负责受理设置业余无线电台申请的机构为:*[A]设台地地方无线电管理机构或其正式委托的代理受理服务机构*32 [Q]设置在省、自治区、直辖市范围内通信的业余无线电台,审批机构为:*[A]设台地的地方无线电管理机构*33 [Q]设置通信范围涉及两个以上的省、自治区、直辖市或者涉及境外的一般业余无线电台,审批机构是下列中:*[A]国家无线电管理机构或其委托的设台地的地方无线电管理机构*34 [Q]按照在省、自治区、直辖市范围内通信所申请设置的业余无线电台,如想要将通信范围扩大至涉及两个以上的省、自治区、直辖市或者涉及境外,或者要到设台地以外进行异地发射操作,须办理下列手续:*[A]事先向核发执照的无线电管理机构申请办理变更手续,按相关流程经国家无线电管理机构或其委托的设台地的地方无线电管理机构批准后,换发业余无线电台执照*35 [Q]业余无线电台执照有效期届满后需要继续使用的,应当在下列期限内向核发执照的无线电管理机构申请办理延续手续:*[A]有效期届满一个月前*36 [Q]因改进或调整业余发射设备使业余无线电台的技术参数超出其业余无线电台执照所核定的范围时,应当办理下列手续:*[A]及时向核发执照的无线电管理机构申请办理变更手续,换发业余无线电台执照*37 [Q]终止使用业余无线电台的,应当向下列机构申请注销执照:*[A]核发业余无线电台执照的无线电管理机构*38 [Q]经地方无线电管理机构批准设置的业余无线电台,设台地迁入其他省、自治区或者直辖市时,应办理的手续为:*[A]先到原核发执照的无线电管理机构办理申请注销原业余无线电台,再到迁入地的地方无线电管理机构办理申请设置业余无线电台的手续*39 [Q]经国家无线电管理机构批准设置的业余无线电台,设台地迁入其他省、自治区或者直辖市时,应办理的手续为:*[A]先到原核发执照的无线电管理机构申请办理注销手续,缴回原电台执照,领取国家无线电管理机构已批准设台的证明,凭证明到迁入地的地方无线电管理机构完成申请变更手续,领取新电台执照*40 [Q]业余无线电台专用无线电发射设备的重要特征是:*[A]发射频率不得超出业余频段*41 [Q]业余无线电发射设备的下列指标必须符合国家的相关规定:*[A]频率容限和杂散域发射功率*42 [Q]业余无线电台使用的发射设备必须符合下列条件:*[A]商品设备应当具备《无线电发射设备型号核准证》,自制、改装、拼装设备应通过国家相关技术标准的检测*43 [Q]对业余无线电台专用无线电发射设备进行型号核准的依据为:*[A]国家《无线电频率划分规定》中有关无线电发射设备技术指标的规定* 44 [Q]业余无线电台专用无线电发射设备的发射频率必须满足的条件是:*[A]发射频率不能超越业余业务或者卫星业余业务频段*45 [Q]业余电台的无线电发射设备应符国家规定的下列主要技术指标:*[A]符合频率容限、符合杂散发射最大允许功率电平*46 [Q]频率容限是发射设备的重要指标,通常用下述单位来表示:*[A]百万分之几(或者赫兹)*47 [Q]杂散域发射功率是发射设备的重要指标,通常用下述单位来表示:*[A]绝对功率dBm、低于载波发射功率的分贝值dBc、低于PEP发射功率的相对值dB*48 [Q]辐射(radiation)是指任何源的能量流以无线电波的形式向外发出。
fcc part 95解读FCC Part 95解读:了解无线电通信规程FCC(美国联邦通信委员会) Part 95是一套涵盖无线电通信的规程,适用于使用个人无线电服务的人群。
这些规程确保了无线电通信在合法和有效的范围内进行,同时保护了电磁频谱的有序使用。
FCC Part 95包括多个子部分,如CB无线电、GMRS(常见移动无线电服务)、FRS(家庭无线电服务)和MURS(多用无线电服务)等。
这些服务分别适用于不同的通信需求,无论是个人之间的短距离通信,还是组织之间的长距离通信。
CB无线电是最常见的个人无线电服务之一。
根据FCC Part 95的规定,CB无线电使用者可以在特定的频率范围内进行短距离通信。
这种通信通常用于车辆间、户外活动或紧急情况下的交流。
然而,使用CB无线电需要一定的许可,以确保频道的有序使用。
另一个常见的个人无线电服务是GMRS,这是一种更强大的无线电通信方式,适用于更长距离的通信需求。
GMRS用户需要获得FCC颁发的许可证,并遵守规定的频率和发射功率等要求。
FRS是用于短距离家庭通信的无线电服务。
与GMRS相比,FRS无需许可证,但发射功率较低,范围更为有限。
因此,FRS通常用于家庭成员之间的日常交流。
MURS是一种较少人知的个人无线电服务,适用于较小的组织或社区间的通信。
这种服务在多个VHF频段上操作,无需许可证,但在使用时需遵守FCC的规定。
FCC Part 95提供了一套完整的规程,用于指导和规范个人无线电服务的使用。
无论是进行短距离通信还是长距离通信,使用者都应遵守相关规定,以确保通信的有效性和合法性。
中华人民共和国无线电频率划分规定总则第一条为了充分、合理、有效地利用无线电频谱资源,保证无线电业务的正常运行,防止各种无线电业务、无线电台站和系统之间的相互干扰,根据《中华人民共和国无线电管理条例》、国际电信联盟《无线电规则》(XX年版)和我国无线电业务发展的实际情况,制定本规定。
第二条在中华人民共和国境内(港澳台地区除外)研制、生产、进口、销售、试验和设置使用各种无线电设备,应当遵守本规定,并按照《中华人民共和国无线电管理条例》等规定办理相应的手续。
第三条在中国香港、澳门特别行政区内使用无线电频率,应当分别遵守中国香港、澳门特别行政区政府有关无线电管理的法律规定。
本规定中列入的中国香港、澳门无线电频率划分表由中国香港、澳门特别行政区政府分别制定和执行,相关资料和规定以中国香港、澳门特别行政区政府的法定文本为准。
本规定暂未列入中国台湾地区无线电频率划分表。
第四条本规定自XX年2月1日起施行。
中华人民共和国工业和信息化部XX年10月18日公布的《中华人民共和国无线电频率划分规定》(中华人民共和国工业和信息化部令第16号)同时废止。
目录第1章无线电管理的术语与定义 11.1 一般术语 11.2 有关频率管理的专用术语 21.3 无线电业务 31.4 无线电台与系统 71.5 操作术语 131.6 发射与无线电设备的特性 151.7 频率共用 181.8 空间技术术语 191.9 无线电频带和波段的命名 211.10 常用字母代码和业务频段对应表 211.11 国际电信联盟(itu)区域划分 22第2章电台的技术特性 24第3章无线电频率划分规定 253.1 引言 253.2 业务种类与划分 253.3 一般规定 263.4 无线电频率划分表 273.5 国际电信联盟无线电频率划分脚注 1373.6 中国无线电频率划分脚注 209附录 213附录1 发射机频率容限 214附录2 发射设备杂散域发射功率限值要求 218附件1 确定杂散域发射和带外域发射界限的补充规定 221附件2 固定业务参考测量带宽的规定值 223附件3 陆地移动业务参考测量带宽的规定值 224附录3 发射标识和必要带宽 226第1章无线电管理的术语与定义下列术语和定义取自中国国家标准《无线电管理术语》(gb/t 13622-XX)和国际电信联盟《无线电规则》XX年版,这些术语与定义仅作本规定统一称呼和理解其含义之用。
我国现行的电磁兼容标准标准代号标准名称对应国际/国外标准GB/T4365-1996电磁兼容术语IEC50、IEC161(90) GJB76-85电磁干扰和电磁兼容性名词术语--GB/T6113-1995无线电干扰和抗扰度测量设备规范--GB 3907-83*工业无线电干扰基本测量方法--GB 4859-84*电气设备的抗干抗扰度性基本测量方法--GB/T15658-1995城市无线电噪声测量方法-- GB8702-88电磁辐射防护规定--GB/T13926.1-92工业过程测量和控制装置的电磁兼容性总论--GB/T13926.2-92工业过程测量和控制装置的电磁兼容性静电放电要求--GB/T13926.3-92工业过程测量和控制装置的电磁兼容性辐射电磁场要求--GB/T13926.4-92工业过程测量和控制装置的电磁兼容性电快速瞬变脉冲群要求--GB/T 14431-93无线电业务要求的信号/干扰保护比和最小可用场强--GB4824-1996工业、科学和医疗(ISM)射频设备电磁骚扰特性的测量方法和限值CISPRII(90)GB4343-1995家用和类似用途电动、电热器具、电动工具以及类似电器无线电干扰特性测量方法和允许值CISPR14(93)GB4343.2-1999电磁兼容 家用电器、电动工具和类似器具的要求 第2部分:抗扰度-产品类标准CISPR14-2:1997GB/T6113-1995无线电干扰和抗扰度测量设备规范--GB/T6113.2-1998无线电干扰和抗扰度测量方法--GB/T17618-1998信息技术设备抗扰度限值和测量方法CISPR24(97)GB/T17619-1998机动车电子器组件的电磁辐射抗扰性限值和测量方法GB/T17624.1-1998电磁兼容 综述 电磁兼容基本术语和定义的应用与解释IEC61000-1-1GB17625.1-1998低压电气及电子设备发出的谐波电流限值(设备每相输入电流<16A)IEC61000-3-2(1995)标准代号标准名称对应国际/国外标准GB17625.2-1999电磁兼容限值对额定电流不大于16A的设备在低压供电系统中产生的电压波动和闪烁的限制--GB/T17626.1-1998电磁兼容试验和测量技术 抗扰度试验总论IEC61000-4-1(1992)GB/T17626.2-1998电磁兼容试验和测量技术 静电放电抗扰度试验IEC61000-4-2(1995)GB/T17626.3-1998电磁兼容试验和测量技术 射频电磁场抗扰度试验IEC61000-4-3(1995)GB/T17626.4-1998电磁兼容试验和测量技术 电快速瞬变脉冲群抗扰度试验IEC61000-4-4(1995)GB/T17626.5-1999电磁兼容试验和测量技术 浪涌(冲击)抗扰度试验--GB/T17626.6-1998电磁兼容试验和测量技术 射频场感应的传导抗扰度IEC61000-4-6(1996)GB/T17626.7-1998电磁兼容试验和测量技术 供电系统及所连设备谐波、谐间波的测量和测量仪器导则IEC61000-4-7(1991)GB/T17626.8-1998电磁兼容试验和测量技术 工频磁场抗扰度试验IEC61000-4-8(1993)GB/T17626.9-1998电磁兼容试验和测量技术 脉冲磁场抗扰度试验IEC61000-4-9(1993)GB/T17626.10-1998电磁兼容试验和测量技术 阻屁振荡磁场抗扰度试验IEC61000-4-10(1993)GB/T17626.12-1998电磁兼容试验和测量技术 振荡波抗扰度试验IEC61000-4-12(1995) GJB/Z17-1991军用装备电磁兼容性管理指南--GJB/Z25-1991电子设备和设施的接地、搭接和屏蔽设计指南--GJB/Z54-1994系统预防电磁能量效应的设计和试验指南--GJB/Z105-1998电子产品防静电控制手册--GJB1210-1991接地、搭接和屏蔽设计的实施--GJB1389-1992系统电磁兼容性要求--标准代号标准名称对应国际/国外标准GJB2079-1994无线电系统间干扰的测量方法--GJB2081-199487~108MHz频段广播业务和108~137MHz频段航空业务之间的兼容--GJB2926-1997电磁兼容性测试试验室认可要求-- GJB3007-1997防静电工作区技术要求--GJB151A-97军用电子设备和分系统电磁发射和敏感度要求--GJB152A-97军用电子设备和分系统电磁发射和敏感度测量--GB12190-90高性能屏蔽室屏蔽效能的测量方法-- GB6833.1-86*电子测量仪器电磁兼容性试验规范总则--GB6833.2-87*电子测量仪器电磁兼容性试验规范 磁场敏感度试验--GB6833.3-87*电子测量仪器电磁兼容性试验规范 静电放电敏感度试验--GB6833.4-87*电子测量仪器电磁兼容性试验规范 电源瞬态敏感度试验--GB6833.5-87*电子测量仪器电磁兼容性试验规范 辐射敏感度试验--GB6833.6-87*电子测量仪器电磁兼容性试验规范 传导敏感度试验--GB6833.7-87*电子测量仪器电磁兼容性试验规范 非工作状态磁场干扰试验--GB6833.8-87*电子测量仪器电磁兼容性试验规范 工作状态磁场干扰试验--GB6833.9-87*电子测量仪器电磁兼容性试验规范 传导干扰试验--GB6833.10-87*电于测量仪器电磁兼容性试验规范 辐射干扰试验--GB7343-87*10kHZ~30MHZ 无源无线电干扰滤波器和抑制元件抑制特性的测量方法--标准代号标准名称对应国际/国外标准GB7434-87*架空明线载波通信系统抗无线电广播和通信干扰的指标--GB7495-87架空电力线路与调幅广播收音台的防护问距-- GB13613-92对海中远程无线电导航台站电磁环境要求--GB13614-92短波无线电测向台(站)电磁环境要求-- GB13615-92地球站电磁环境保护要求-- GB13616-92微波接力站电磁环境保护要求-- GB13617-92短波无线电收信台(站)电磁环境要求-- GB13618-92对空情报雷达站电磁环境防护要求--GB/T13620-92卫星通信地球站与地面微波站之间协调区的确定和干扰计算方法--GB9254-1998信息技术设备的无线电骚扰限值和测量方法CISPR22(1997)GB17743-1999电气照明和类似设备的无线电干扰特性的限值和测量方法CISPR15(1996)*QJ 1211-870122;V06航天系统地面设施接地要求 国内 QJ 1213-870122;V06电磁屏蔽室屏蔽效能的测量方法 国内 *QJ 1539-880122;V751航天遥测系统的电磁兼容性要求和测量方法国内 *QJ 1692-890122;V06航天系统地面设施电磁兼容性要求 国内 QJ 1693--890122;V06电子元器件防静电要求 国内 QJ 1760-890122;V06用频谱仪测量电磁干扰的方法 国内标准代号标准名称对应国际/国外标准*QJ 1874-900122;V06接地、搭接和屏蔽的设计应用 国内 *QJ 1875-900122;V06静电测试方法 国内 QJ 1875A-980122;V06静电测试方法 国内 QJ 1950-900122;V06防静电操作系统技术要求 国内 QJ 2177-910122;V06防静电安全工作台技术要求 国内 QJ 2245-920122;V06电子仪器和设备防静电要求 国内 QJ 2256-920122;V06系统预防电磁能量效应的设计和试验指南 国内 QJ 2266-92 航天系统电磁兼容性要求 国内0122;V06*QJ 2268-920122;V711地(舰)空导弹武器系统抗干扰性能要求 国内QJ 2350-92 0122;V06电磁辐射敏感度的测试方法 横电磁波传输室测量国内QJ 2892-970122;V06EMI衬垫的测量与评价方法 国内 QJ 3035-980122;V27电子机柜电磁屏蔽要求和测试方法 国内标准代号标准名称对应国际/国外标准*QJ 1874-900122;V06接地、搭接和屏蔽的设计应用 国内 *QJ 1875-900122;V06静电测试方法 国内 QJ 1875A-980122;V06静电测试方法 国内 QJ 1950-900122;V06防静电操作系统技术要求 国内 QJ 2177-910122;V06防静电安全工作台技术要求 国内 QJ 2245-920122;V06电子仪器和设备防静电要求 国内 QJ 2256-920122;V06系统预防电磁能量效应的设计和试验指南 国内 QJ 2266-920122;V06航天系统电磁兼容性要求 国内 *QJ 2268-920122;V711地(舰)空导弹武器系统抗干扰性能要求 国内QJ 2350-92 0122;V06电磁辐射敏感度的测试方法 横电磁波传输室测量国内QJ 2892-970122;V06EMI衬垫的测量与评价方法 国内 QJ 3035-980122;V27电子机柜电磁屏蔽要求和测试方法 国内。
电 磁 干 扰 篇△45、电磁兼容(EMC )与电磁干扰(EMI )所谓电磁兼容性,是指电子设备或系统工作在指定的环境中,不致由于无意的电磁辐射而遭受或引起不能容忍的性能下降或发生故障的抑制能力。
电磁兼容的反面即电磁干扰,欲解决电磁兼容性问题,必须从分析系统和系统间电磁干扰着手。
从无线信号的干扰产生的机理来看,应该将干扰分为:———— 热噪声的增加———— 离散型干扰⎪⎩⎪⎨⎧互调及谐波邻道干扰同频干扰———— 杂散干扰及接收机阻塞当前移动通信系统正处于2G 向3G 平滑过渡的年代,2G 系统的G 网、C 网、PHS 网和3G 系统的WCDMA 、Cdma20001x 以及TD —SCDMA 之间将长期共存。
因此,分析它们之间的电磁干扰将是移动通信建设和运营部门迫在眉睫的重大课题。
☆46、同频干扰和同频干扰保护比顾名思义,当接收机接收到的无用信号的频率与有用信号相同时,即称为同频干扰。
在蜂窝移动通信网中,相同的频率在隔开一段距离以后被重复使用,这一原理是蜂窝系统的精髓所在,也是解决系统容量和提高频谱利用率的根本途径。
但由此带来的问题是系统内的同频干扰。
为了使系统能正常工作,由于频率复用引起的同频干扰必须是足够小以至于可以被忽略或者至少不影响正常的通信。
在G 网中,通常将整个频段分成若干频率组k ,对应分配到各小区;频率分组愈多,整个系统内同频小区的间隔就愈大,同频干扰就愈小,但每区频道数将减少,使话务量也随之降低。
合理的方式是在满足同频干扰保护比的前提下将k 值降至最低,在全向天线状态下,k 与同频复用距离D 的关系是:rD =3k 式中:D 为同频小区中心间距r 为小区半径k 即频率复用系数下表为k=3~12时,对应的rD 值同频复用保护距离主要取决于同频干扰保护比(C/I )值,它与要求的信号质量、传播环境、要求的信号通信概率等因素有关。
如果假定区内电波传播衰减与距离呈4次方幂关系,则可推断得:I C = ()4r D 61 = ()23k 61 = 23k 2或k = IC 32 G 网中,通常取IC =12dB 或9dB 对应的k = 3.27或2.31因此,当不带跳频时(IC =12dB ),k=3已趋极限 PHS 系统的同频干扰保护比C/I = 17dB在C 网和即将投入商用的3G 系统中,由于采用了直接扩频码分多址技术,其基础是使用一组正交(或准正交)的伪随机码噪声(PN )序列通过相关处理实现选址的功能。
1.____是船舶电台的呼号A. 9VGB. BAAD1C. XSF26D. BOAD2.电台工作日志,国内各类来往电报保管期为____A. 半年/一年B. 一年/二年C. 一年/半年D. 二年/一年3.气象报告和航行警告的保管期为____A. 半年B. 三个月C. 一年D. 二年4.GMDSS船舶无线电人员需每天至少提供____无线电时间信号以修正船舶天文钟A. 一次B. 二次C. 三次D. 四次5.现场通信使用无线电话频率应选择____A. 156.8MHzB. 2182KHzC. 2174.5KHzD. A和B6.DSC遇险呼叫中, 如通信方式使用无线电话,应选择____A. 2187.5/2177.0KHZB. 2187.5/2182.0KHZC. 2187.5/4177.5KHZD. 2187.5/2174.5KHZ7.____不是DSC遇险呼叫频率和无线电话遇险通信频率A. 6312.0/6215.0B. 2187.5/2182.0C. 8414.5/8376.5D. 12577/12290.08.船舶在A2海区遇险使用DSC报警,频率应为____A. 2182KHzB. 2174.5KHzC. 2191KHzD. 2187.5KHz9.当航空器参与协调救助作业时可使用的频率____A. 3023KHzB. 5680KHzC. 156.8MHzD. A、B、C均是10.使用无线电传进行现场通信频率应是____A. 2174.5KHzB. 2182.0KHzC. 2187.5KHzD. CH16频道11.____是用于海岸电台以FEC方式发送MSI的频率A. 8291KHzB. 8376.5KHzC. 8415KHzD. 8416.5KHz12.使用中频进行国际DSC常规呼叫时应选择____频率A. 458.5/455.5KHZB. 2187.5/2187.5KHZC. 4208.0/4219.5KHZD. 6312.5/6331.0KHZ13.____不是DSC遇险呼叫频率A. 2187.5KHzB. 2182.0KHzC. 8414.5KHzD. 4207.5KHz14.救生艇手提式VHF双向无线电话,必须具备____频道A. CH6B. CH16C. CH70D. CH1315..国际上规定VHF 6频道用于____A. 无线电遇险和安全通信B. 船舶雾航避让,防台联系C. 船-船有关航行安全的通信D. 船舶与航空器之间进行协调搜救行动通信16.在GMDSS中,要求VHF无线电话设备应能在____频道上发送和接收DSC信息A. 6B. 13C. 16D. 7017..救生艇手提式双向无线电话工作频道要求____A. VHFCH16和至少另外一个频道B. VHFCH16和至少另外二个频道C. VHFCH16和至少另外一个单工频道D. VHF任意二个频道18.船岸台进行ARQ通信时,工作频率应选用____A. 非成对频率B. 指定的成对频率C. 自定任选频率D. A. B. C均是19.在GMDSS中,使用NBDP设备进行遇险通信的频率应是____A. 收、发频率相同B. 收、发频率不同C. 发射频率高于接收频率D. 接收频率高于发射频率20.在NBDP遇险通信中,对干扰电台强制静默使用信号_____A. SILENCE MAYDAYB. SEELONCE MAYDAYC. SEELONC EFINID. SILENCE FEENEE21.无线电话遇险通信中,遇险通信结束恢复正常工作使用信号_____A. SILENCE FINIB. SEELONCE FEENEEC. SEELONCE FINID. SILENCE FEENEE22.无线电传遇险通信中,恢复正常工作使用信号_____A. QUMB. SEELONCE FEENEEC. SEELONCE MAYDAYD. SILENCE FINI23._____是海岸电台的呼号A. 9VG98B. XSFC. XSG26D. A、B、C都是24.组成海岸电台呼叫识别的结构为____A. 0MIDX5X6X7X8X9B. 00MIDX6X7X8X9C. 000MIDX7X8X9D. MIDX4X5X6X7X8X925.水上移动业务识别为041234500是船舶电台标识的____A. 区域型式B. 国内型式C. 全球型式D. 成组呼叫识别26.水上识别数字(MID)的首位数是6代表的区域是____A. 非洲B. 南美洲C. 欧洲D. 大洋洲27.____是我国船舶电台的MMSIA. 047735000B. 004122100C. 412123000D. 21944257328.MMSI标识由____数字组成A. 三位B. 五位C. 七位D. 九位29.水上移动业务标识(MMSI)为412345670是船舶电台的____A. 国内型式B. 区域型式C. 全球型式D. 群呼型式30.海上移动业务识别中,中国的海上识别码(MID)为____A. 085B. 086C. 581D. 41231.____是INMARSAT-B站海上移动业务识别码(IMN)A. 341234610B. 441234650C. 1570174D. 41254181032.海事卫星水上移动业务识别码结构为TX1X2…Xk,其中T是用于区分海事卫星不同的系统,当T为0时表示为____A.A标准移动业务B. A标准群呼C. B标准移动业务D. A标准特别业务33.____应是C船站的IMNA. 1570152B. 441210810C. 004212100D. 41212300034.在我国的陆上用户电传应答码中,我国的国家标识用____表示A. CHINAB. CHNC. CND. CY35.无线电话遇险信号由____组成A. PANPANB. SOSC. MAYDAYD. SECURITE36.无线电传的紧急信号是____A. PANPANB. PANPAN三次C. XXXD. XXX三次37.在GMDSS中,无线电话的安全信号是由____组成的A. SECURITEB. PANPANC. MAYDAYD. XXX38.船舶在HF/DSC上收到DSC遇险报警,____后仍无海岸电台发射收妥承认,则该船台应进行遇险报警转播。
标准号标准名称对应国际/国外标准基础类标准GB/T 4365-1995 电磁兼容术语GB/T 6113-1995 无线电干扰和抗扰度测量设备规范GB 3907-83* 工业无线电干扰基本测量方法GB 4859-84* 电气设备的抗干抗扰度性基本测量方法GB/T 15658-1995 城市无线电噪声测量方法GB/T 4365 1995 电磁兼容术语 IEC 50 (161) 1990GB/T 6113.1 1995 无线电干扰和抗扰度测量设备规范 CISPR16 1 1993GB/T 6113.2 1998 无线电干扰和抗扰度测量方法 CISPR16 2 1993GB 3907 83* 工业无线电干扰基本测量方法 CISPR16 1977GB 4859 84* 电气设备的抗干扰特性基本测量方法GB/T 15658 1995 城市无线电噪声测量方法GB/T 17624.1 1998 电磁兼容基本术语和定义的应用与解释 IEC 61000 1 1GB 17625.1 1998 低压电气及电子设备发出的谐波电流限值(设备每相输入电流≤16A)IEC 61000 3 2GB 17625.2 1999 对额定电流大于16A的设备在低压供电系统中产生的电压波动和闪烁的限制 IEC 61000 3 3GB/T 17626.1 1998 抗扰性测试综述 IEC 61000 4 1GB/T 17626.2 1998 静电放电抗扰性试验 IEC 61000 4 2GB/T 17626.3 1998 辐射(射频)电磁场抗扰性试验 IEC 61000 4 3GB/T 17626.4 1998 快速瞬变电脉冲群抗扰性试验 IEC 61000 4 4GB/T 17626.5 1998 浪涌(冲击)抗扰性试验 IEC 61000 4 5GB/T 17626.6 1998 射频场感应的传导骚扰抗扰性试验 IEC 61000 4 6GB/T 17626.7 1998 供电系统及所联设备的谐波和中间谐波的测量仪器通用导则 IEC 61000 4 7GB/T 17626.8 1998 工频磁场抗扰性试验 IEC 61000 4 8GB/T 17626.9 1998 脉冲磁场抗扰性试验 IEC 61000 4 9GB/T 17626.10 1998 衰减振荡磁场抗扰性试验 IEC 61000 4 10GB/T 17626.11 1999 电压暂降、短时中断和电压变化抗扰性试验 IEC 61000 4 11GB/T 17626.12 1998 振荡波抗扰性试验 IEC 61000 4 12GB/T4365-1995 电磁兼容术语(eq.IEC60050:1990)GB/T4859-1984 电气设备的抗干扰特性基本测量方法GB/T6113.1-1995 无线电骚扰和抗扰度测量设备规范(eqv.CISPR16-l:1993)GB/T6113.2-1998 无线电骚扰和抗扰度测量方法(idt.CISPR16-2:1995)GB/T3907-1983 工业无线电干扰基本测量方法GB/T 6113-1995 无线电干扰和抗扰度测量设备规范GB9175-1988 环境电磁波卫生标准GB10436-1998 作业场所微波辐射卫生标准通用类标GB 8702-88 电磁辐射防护规定GB/T 13926.1-92 工业过程测量和控制装置的电磁兼容性总论GB/T 13926.2-92 工业过程测量和控制装置的电磁兼容性静电放电要求GB/T 13926.3-92 工业过程测量和控制装置的电磁兼容性辐射电磁场要求GB/T 13926.4-92 工业过程测量和控制装置的电磁兼容性电快速瞬变脉冲群要求GB/T 14431-93 无线电业务要求的信号/干扰保护比和最小可用场强GB 8702 1988 电磁辐射防护规定GB/T 14431 1993 无线电业务要求的信号/干扰保护比和最小可用场强GB/T17799.1-1999 电磁兼容通用标准居住、商业和轻工业环境中的抗扰度试验GB/T 13926.1-92 工业过程测量和控制装置的电磁兼容性总论 IEC 801 1GB/T 13926.2一92 工业过程测量和控制装置的电磁兼容性静电放电要求 IEC 801 2 GB/T 13926.3-92 工业过程测量和控制装置的电磁兼容性辐射电磁场要求 IEC 801 3GB/T 13926.4-92 工业过程测量和控制装置的电磁兼容性电快速瞬变脉冲群要求IEC 801 4GB8702-1988 电磁辐射防护规定GB/T15658-1995 城市无线电噪声测量方法产品类(产品族)GB 4343-1995 家用和类似用途电动、电热器具,电动工具以及类似电器无线电干扰特性测量方法和允许值GB 4824-1996 工业、科学和医疗(ISM)射频设备电磁骚扰特性的测量方法和限值GB 6833.1-86* 电子测量仪器电磁兼容性试验规范总则GB 6833.2-87* 电子测量仪器电磁兼容性试验规范磁场敏感度试验GB 6833.3-87* 电子测量仪器电磁兼容性试验规范静电放电敏感度试验GB 6833.4-87* 电子测量仪器电磁兼容性试验规范电源瞬态敏感度试验GB 6833.5-87* 电子测量仪器电磁兼容性试验规范辐射敏感度试验GB 6833.6-87* 电子测量仪器电磁兼容性试验规范传导敏感度试验GB 6833.7-87* 电子测量仪器电磁兼容性试验规范非工作状态磁场干扰试验GB 6833.8-87* 电子测量仪器电磁兼容性试验规范工作状态磁场干扰试验GB 6833.9-87* 电子测量仪器电磁兼容性试验规范传导干扰试验GB 6833.10-87* 电于测量仪器电磁兼容性试验规范辐射干扰试验GB 7343-87* 10kHZ~30MHZ 无源无线电干扰滤波器和抑制元件抑制特性的测量方法GB 7349-87* 高压架空输电线、变电站无线电干扰测量方法GB 9254-88 信息技术设备的无线电干扰极限值和测量方法GB 9383-1995 声音和电视广播接收机及有关设备传导抗扰度限值及测量方法GB 13421-92 无线电发射机杂散发射功率电平的限值和测量方法GB 13836-92* 30MH2~1GH声音和电视信号的电缆分配系统设备与部件辐射干扰特性允许值和测量方法GB 13837-1997 声音和电视广播接收机及有关设备无线电干扰特性限值和测量方法GB/T 13838-92 声音和电视广播接收机及有关设备辐射抗扰度特性允许值和测量方法GB 13839-92 声音和电视广播接收机及有关设备内部抗扰度允许值和测量方法GB 14023-92 车辆、机动船和由火花点火发动机驱动的装置的无线电干扰特性的测量方法及允许值GB 15540-1995 陆地移动通信设备电磁兼容技术要求和测量方法GB 15707-1995 高压交流架空送电线无线电干扰限值GB/T15708-1995 交流电气化铁道电力机车运行产生的无线电辐射干扰的测量方法GB/T15709-1995 交流电气化铁道接触网无线电辐射干扰测量方法GB 15734-1995 电子调光设备无线电骚扰特性限值及测量方法GB 15949-1995 声音和电视信号的电缆分配系统设备与部件抗扰度特性限值和测量方法GB/T 16607-1996 微波炉在1GHz以上的辐射干扰测量方法B 16787-1997 G 30MHz~1GHz声音和电视信号的电缆分配系统辐射测量方法和限值GB 16788-1997 30MHz~1GHz声音和电视信号电缆分配系统抗扰度测量方法和限值GB4343-1995 家用和类似用途电动、电热器具,电动工具以及类似电器无线电干扰特性测量方法和允许值(eqv.CISPR14:1993)GB4343.2-1999 电磁兼容家用电器、电动工具和类似器具的要求第2部分:抗扰度-产品类标准(idt.CISPR14-2:10997)GB 4343 1995 家用和类似用途电动、电热器具、电动工具以及类似电器无线电干扰特性测量方法和允许值 CISPR 14 1993GB 4343.2 1999 CISPR 14 –2 1993GB 4824 1996 工业、科学和医疗(ISM)射频设备电磁干扰特性的测量方法和限值(替代GB4824.1~1984) CISPR 11 1990GB 6833 1987* 电子测量仪器电磁兼容性试验规范GB 7343 1987* 无源无线电干扰滤波器和抑制元件抑制特性的测量方法 CISPR 17 1981 GB 7349 1987* 高压架空输电线、变电站无线电干扰测量方法 CISPR 18 1986GB 9254 1988 信息技术设备的无线电干扰限值和测量方法 CISPR 22 1997GB/T 17618 1998 信息技术设备抗扰度限值和测量方法 CISPR 24 1997GB 9383 1995 声音和电视广播接收机及有关设备传导抗扰度限值及测量方法 CISPR 20 1990GB 13837 1992 声音和电视广播接收机及有关设备无线电干扰特性限值和测量方法CISPR 13 1996GB/T 13838 1992 声音和电视广播接收机及有关设备辐射抗扰度特性允许值和测量方法CISPR 20 1990GB/T 13839 1992 声音和电视广播接收机及有关设备内部抗扰度允许值和测量方法CISPR 20 1990GB/T 13836 1992 30MHz~1GHz声音和电视信号的电缆分配系统设备与部件辐射干扰特性允许值和测量方法 IEC 728 1 1986GB 15949 1995 声音和电视信号的电缆分配系统设备与部件抗扰度特性限值和测量方法IEC 728 1 1986GB 16787 1997 30MHz~1GHz声音和电视信号的电缆分配系统辐射测量方法和限值 IEC 728 1 1986GB 16788 1997 30MHz~1GHz声音和电视信号的电缆分配系统抗扰度测量方法和限值 IEC 728 1 1986GB 13421 1992 无线电发射机杂散发射功率电平的限值和测量方法GB 15540 1995 陆地移动通信设备电磁兼容技术要求和测量方法GB 14023 1992 车辆、机动船和由火花点火发动机驱动装置的无线电干扰特性的测量方法和允许值 CISPR 12 1990GB 15707 1995 高压交流架空输送电线无线电干扰限值 CISPR 18-1986GB/T 15708 1995 交流电气化铁道电力机车运行产生的无线电辐射干扰测量方法GB/T 15709 1995 交流电气化铁道接触网无线电辐射干扰测量方法GB 15734 1995 电子调光设备无线电骚扰特性限值及测量方法GB 17743 1999 荧光灯和照明装置无线电骚扰特性的测量方法和限值 CISPR 15 1995 GB/T 17619 1998 汽车用电子装置的抗扰度试验方法及限值欧标72/245/EECGB/T 16607 1996 微波炉在1GHZ以上辐射干扰测量方法 CISPR 19 1983GB/T6833.1-1986 电子测量仪器电磁兼容性试验规范总则(HP 765.001-77)GB/T6833.2-1987 电子测量仪器电磁兼容性试验规范磁场敏感度试验(HP765.002-77)GB/T6833.3-1987 电子测量仪器电磁兼容性试验规范静电放电敏感度试验(HP765.003-77)GB/T6833.4-1987 电子测量仪器电磁兼容性试验规范电源瞬态敏感度试验(HP765.004-77)GB/T6833.5-1987 电子测量仪器电磁兼容性试验规范辐射敏感度试验( HP765.005-77)GB/T6833.6-1987 电子测量仪器电磁兼容性试验规范传导敏感度试验(HP765.006-77)GB/T6833.7-1987 电子测量仪器电磁兼容性试验规范非工作状态磁场干扰试验(HP765.007-77)GB/T6833.8-1987 电子测量仪器电磁兼容性试验规范工作状态磁场干扰试验(HP765.008-77)GB/T6833.9-1987 电子测量仪器电磁兼容性试验规范传导干扰试验( HP765.009-77)GB/T6833.10-1987 电子测量仪器电磁兼容性试验规范辐射干扰试验(HP76.0010-77)GB/T7343-1987 10kHz~30MHZ(CISPR17:1981)无源无线电干扰滤波器和抑制元件特性的测量方法GB/T7349-1987 高压架空输电线、变电站无线电干扰测量方法GB4343-1995 家用和类似用途电动、电热器具,电动工具以及类似电器无线电干扰特性测量方法和允许值(eqv.CISPR14:1993)GB4343.2-1999 电磁兼容家用电器、电动工具和类似器具的要求第2部分:抗扰度-产品类标准(idt.CISPR14-2:10997)GB9254-1998 信息技术设备的无线电骚扰限值和测量方法(idt.CISPR22:1997)GB/T9383-19992 声音和电视广播接收机及有关设备抗扰度限值和测量方法(idt.CISPR20:1998)GB/T12190-1990 高性能屏蔽室屏蔽效能的测量方法(ref.IEEE299-69,MIL-285)GB12638-1990 微波和超短波通信设备辐射安全要求GB/T 13838-92 声音和电视广播接收机及有关设备辐射抗扰度特性允许值和测量方法GB/T 13839-92 声音和电视广播接收机及有关设备内部抗扰度允许值和测量方法GB 9383一1995 声音和电视广播接收机及有关设备传导抗扰度限值及测量方法GB13836-1992 30MHz~IGHZ声音和电视信号的电缆分配系统设备和部件辐射干扰特性允许值和测量方法(idt.IEC 60728-1:1986)GB13837-1997 声音和电视广播接收机及有关设备无线电干扰特性限值和测量方法(eqv.CISPR13:1996)GB14023-1992 车辆、机动船和由火花点火发动机驱动的装置的无线电干扰特性的测量方法和允许值(eqv.CISPR12:1990)GB/T14598.13-1998 量度继电器和保护装置的电气干扰试验第1部分1MHZ脉冲群干扰试验GB/T14598.14-1998 量度继电器和保护装置的电气干扰试验第2部分静电放电试验GB15540-1995 陆地移动通信设备电磁兼容技术要求和测量方法城市无线电噪声测量方法GB15707-1995 高压交流架空送电线无线电干扰限值(eqv.CISPR18:1996)GB/T15708-1995 交流电气化铁道电力机车运行产生的无线电辐射干扰的测量方法GB/T15709-1995 交流电气化铁道接触网无线电辐射干扰测量方法GB15734-1995 电子调光设备无线电骚扰特性限值及测量方法GB15949-1995 声音和电视信号的电缆分配系统设备与部件抗扰度特性限值和测量方法GB16607-1996 微波炉在1GHz以上的辐射干扰测量方法(eqv.CISPR19:1983)GB16787-1997 30MHZ~1GHz声音和电视信号的电缆分配系统辐射测量方法和限值(idt.TEC60728-1:1991)GB16788-1997 30MHZ~1GHz声音和电视信号的电缆分配系统辐射测量方法和限值(idt.TEC60728-1:1991GB/T 12190一1990 高性能屏蔽室屏蔽效能的测量方法(ref.IEEE299-69,MIL-285)GB/T14598.10-1996 电力继电器第22部分:量度继电器和保护装置的电气干扰试验第4篇:快速瞬变干扰试验GB/T17618-1998 信息技术设备抗扰度限值和测量方法GB/T17619-1998 机动车电子电器组件的电磁辐射抗扰性限值和测量方法GB/T17625.1-1998 低压电气及电子设备发出的谐波电流限值(设备每相输入电流<16A)GB/17743-1999 电气照明和类似设备的无线电骚扰特性的限值和测量方法系统间类GB 6364-86 航空无线电导航台站电磁环境要求GB 6830-86 电信线路遭受强电线路危险影响的容许值GB 7432-87* 同轴电缆载波通信系统抗无线电广播和通信干扰的指标GB 7433-87* 对称电缆载波通信系统抗无线电广播和通信干扰的指标GB 7434-87* 架空明线载波通信系统抗无线电广播和通信干扰的指标GB 7495-87 架空电力线路与调幅广播收音台的防护问距GB 13613-92 对海中远程无线电导航台站电磁环境要求GB 13614-92 短波无线电测向台(站)电磁环境要求GB 13615-92 地球站电磁环境保护要求GB 13616-92 微波接力站电磁环境保护要求GB 13617-92 短波无线电收信台(站)电磁环境要求GB 13618-92 对空情报雷达站电磁环境防护要求GB/T13620-92 卫星通信地球站与地面微波站之间协调区的确定和干扰计算方法GB6364-1986 航空无线电导航台站电磁环境要求GB6830-1986 电信线路遭受强电线路危险影响的容许值GB/T7432-1987 同轴电缆载波通信系统抗无线电广播和通信干扰的指标GB/T7433-1987 对称电缆载波通信系统抗无线电广播和通信干扰指标GB/T7434-1987 架空明线载波系统抗无线电广播和通信干扰指标GB7495-1987 架空电力线路与调幅广播收音台的防护间距GB13421-1992 无线电发射机杂散发射功率电平的限值和测量方法GB13613-1992 对海中远程无线电导航台站电磁环境要求GB13614-1992 短波无线电测向台(站)电磁环境要求GB13615-1992 地球站电磁环境保护要求GB13616-1992 微波接力站电磁环境保护要求GB13617-1992 短波无线电收信台(站)电磁环境要求GB13618-1992 对空情报雷达站电磁环境防护要求GB/T13619-1992 微波接力通信系统干扰计算方法GB/T13620-1992 卫星通信地球站与地面微波站之间协调区的确定和干扰计算方法注:凡标记“*”的国家标准在清理整顿中已改为推荐性国家标准。
C类无线电题库4(1000-1066)-企事业内部考试其他试卷与试题1. [I]LK0899[Q]业余电台和业余卫星之间通信,VHF/UHF频段影响信号强度的主要因素是:A. 无线电波在自由空间的衰减B. 电离层对无线电波的吸收C. 电离层对无线电波的反射D. 大地对无线电波的吸收答案:A2. [I]LK0901[Q]业余卫星通信和业余无线电测向都会出现“多普勒效应”的概念。
多普勒效应是指:A. 收发信机之间相对距离的变化使接收信号频率产生偏移的现象B. 传播条件随时间的扰动使接收信号幅度产生波动的现象C. 传播条件随空间位置的扰动使接收信号幅度产生波动的现象D. 电波极化方向在传播途中变化使接收信号幅度产生波动的现象答案:A3. [I]LK0902[Q]地面业余电台进行业余卫星通信时,接收到的卫星信号频率的多普勒频移规律是:A. 卫星飞来时频率偏高,飞离时频率偏低,越远频偏越大,过顶时频偏最小B. 卫星飞来时频率偏低,飞离时频率偏高,越远频偏越大,过顶时频偏最小C. 卫星飞来时频率偏高,飞离时频率偏低,越远频偏越小,过顶时频偏最大D. 卫星飞来时频率偏低,飞离时频率偏高,越远频偏越小,过顶时频偏最大答案:A4. [I]LK0985[Q]按照频率划分表,122.25—123GHz业余频段不能用于卫星业余业务,但这对业余卫星通信活动影响不大。
这是因为:A. 60GHz、120GHz、183GHz附近存在衰减很大的大气吸收频带,并不适合用作业余卫星通信B. 120GHz附近频段存在特别强烈的宇宙射线干扰,不适合用作卫星通信C. 业余无线电爱好者不具备制造工作在120GHz附近频段的设备的能力D. 120GHz附近频段的天线尺寸太大,不适合用作业余卫星通信答案:A5. [I]LK0986[Q]无线电波传播受降雨影响最严重的频段是:A. 极高频EHF(毫米波)B. 高频HF(短波)C. 低频LF(长波)D. 特高频UHF(分米波)答案:A6. [I]LK0987[Q]无线电波传播受降雨影响最严重的频段是:A. 极高频EHF(毫米波)B. 中频MF(中波)C. 甚低频VLF(甚长波)D. 甚高频VHF(米波)答案:A7. [I]LK1047[Q]做EME通信试验最好的时机是:A. 月亮处于近地点B. 满月C. 通信两端天气都好D. 太阳黑子数高答案:A8. [I]LK1117[Q]在10米、6米、2米波段经常能够接收到的“超视距传播”信号与下列哪种传播现象密切相关?A. 突发E电离层B. 流星余迹反向散射C. D层的吸收D. 灰线传播答案:A9. [I]LK1118[Q]在通常情况下,下列哪种传播模式可能使500公里左右范围的VHF和UHF超视距通信变得可行?A. 对流层散射B. D层折射C. F2层折射D. 法拉第旋转答案:A10. [I]LK1119[Q]哪一个业余无线电波段最适合流星余迹散射通信?A. 6米B. 10米C. 2米D. 70厘米答案:A11. [I]LK1120[Q]是什么导致了对流层的大气波导传播?A. 大气高空逆温B. 太阳黑子和太阳耀斑C. 飓风或龙卷风导致的上升气流D. 雷暴时闪电的放电答案:A12. [I]LK0437[Q]用甲乙两块电压表检查一节新干电池两端电压,均测得1.5伏。
一、基础知识1.1 填空题1,1864年,由著名的物理学家从理论上预言了电磁波的存在,后来又通过一系列的实验验证了这一理论的正确性,并进一步完善了这一理论2,1887年首先验证了电磁波的存在。
3,在空间以一定速度传播的交变电磁场叫4,电磁场场强标准单位为磁场场强的单位为,功率通量密度的标准单位为5,在国际频率划分中,中国属于第区6,通常情况下,无线电波的频率越高,损耗越,反射能力越,绕射能力越7,无线电波甚高频(VHF)的频率范围是从到8,中国联通CDMA系统使用频率为(基站收),(基站发)9,IS-95标准的CDMA移动系统的必要带宽为10,我国PHS无线接入系统使用的频率范围是11,在 MHz有我国拥有自主知识产权的移动通信系统,这个系统是12,新版<<中华人民共和国无线电频率划分规定>>中,108-137MHz航空频段中无线电导航频率为、航空移动频率为13,目前较常用的短距离微功率扩频无线电通信使用和频段。
14,新版<<中华人民共和国无线电频率划分规定>>中,频率规划到 Hz。
15,600MHz无线电波的波长是 m 。
16,0dBW= dBm,1V= dBv= dBmv= dBμV17,f0=2f1-f2是互调,f0=f1+f2-f3是互调。
18,当R = 50Ω时,20dBmV= dBm。
如果阻抗是75Ω,则应为 dBm。
19,dB(pW/m2)是参数的单位。
20,在幅度调制中,过调制会造成信号较大的,并且增加了发射的。
21,蜂窝通讯系统的频率规划是利用地理位置分割为基础的,在有适当的各蜂窝之间可以实现。
22,输出输入曲线上的电平根据线性响应被减少1dB的点叫23,最简单的检波器元件是。
24,带外发射指由于调制过程而产生的刚超出的一个或多个频率的发射。
25,杂散发射指之外的一个或多个频率的发射,其发射电平可降低而不致影响信息的传输,但除外。
COMMISSION DIRECTIVE 95/54/ECof 31 October 1995adapting to technical progress Council Directive 72/245/EEC on the approximation of the laws of the Member States relating to the suppression of radio interference produced by spark-ignition engines fitted to motor vehicles and amending Directive 70/156/EEC on the approximation of the laws of the Member States relating to the type-approval of motor vehicles and their trailers THE COMMISSION OF THE EUROPEAN COMMUNITIES,Having regard to the Treaty establishing the European Community,Having regard to Council Directive 70/156/EEC of 6 February 1970 on the approximation of the laws of the Member States relating to the type-approval of motor vehicles and their trailers (1), as last amended by Commission Directive 93/81/EEC (2), and in particular Article 13 (2) thereof,Having regard to Council Directive 72/245/EEC of 20 June 1972 on the approximation of the laws of the Member States relating to the suppression of radio interference produced by spark-ignition engines fitted to motor vehicles (3), as amended by Commission Directive 89/491/EEC (4), and in particular Article 4 thereof,Whereas Directive 72/245/EEC is one of the separate directives of the EEC type-approval procedure which was established pursuant to Directive 70/156/EEC; whereas, consequently, the provisions laid down in Directive 70/156/EEC relating to vehicle systems, components and separate technical units apply to this Directive;Whereas, in particular, Articles 3 (4) and 4 (3) of Directive 70/156/EEC require each separate directive to have attached to it an information document incorporating the relevant items of Annex I to that Directive and also a type-approval certificate based on Annex VI thereto in order that type-approval may be computerized;Whereas Directive 72/245/EEC contained the earliest measures endeavouring to bring about a basic electromagnetic compatibility regarding radio interference, since which time technical progress has increased the complexity and diversity of electrical and electronic equipment; Whereas, in view of the increasing concern about the technological developments in electrical and electronic equipment and the need to ensure the general compatibility of different electrical and electronic equipment, Council Directive 89/336/EEC (5), as last amended by Directive 93/68/EEC (6), laid down general provisions regarding electromagnetic compatibility for all products;Whereas Directive 89/336/EEC established the rule that, in so far as protection requirements specified in that Directive were harmonized, its general provisions would not apply or would cease to apply with regard to apparatus covered by specific directives;(1) OJ No L 42, 23. 2. 1970, p. 1.(2) OJ No L 264, 23. 10. 1993, p. 49.(3) OJ No L 152, 6. 7. 1972, p. 15.(4) OJ No L 238, 15. 8. 1989, p. 43.(5) OJ No L 139, 23. 5. 1989, p. 19.(6) OJ No L 220, 30. 8. 1993, p. 1.Whereas in the field of vehicles, their components and separate technical units, it is necessary to envisage a specific directive within the framework of the system for European type-approval which provides for approvals granted by designated national authorities to harmonized technical requirements;Whereas Directive 72/245/EEC should become such a specific directive;Whereas reference is made to electromagnetic compatibility in other directives relating to vehicles, their components and separate technical units, within the framework of Directive 70/156/EEC;Whereas the technical requirements relating to the radio interference (electromagnetic compatibility) of vehicles, their components and systems should be governed from 1 January 1996 solely by the provisions of Directive 72/245/EEC;Whereas it is necessary to amend Directive 70/156/EEC to reflect the extension of Directive 72/245/EEC to all vehicle categories;Whereas it is necessary to refer to Council Directive 72/306/EEC (1), as amended by Directive 89/491/EEC, in order to distinguish between spark and compression ignition engines;Whereas the measures provided for in this Directive are in accordance with the opinion of the Committee for Adaptation to Technical Progress established by Directive 70/156/EEC,HAS ADOPTED THIS DIRECTIVE:(1) OJ No L 190, 20. 8. 1972, p. 1.Article 1Directive 72/245/EEC is hereby amended as follows:1. the title shall be replaced by the following:'Council Directive 72/245/EEC of 20 June 1972 relating to the radio interference (electromagnetic compatibility) of vehicles';2. Article 1 shall be replaced by the following:'Article 1For the purpose of this Directive, "vehicle" means any vehicle as defined in Directive 70/156/EEC.';3. Article 2 shall be replaced by the following:'Article 2No Member State may refuse to grant EEC type-approval or national type-approval of a vehicle, component or separate technical unit on grounds relating to electromagnetic compatibility if the requirements of this Directive are fulfilled.';4. Article 3 shall be replaced by the following:'Article 31. This Directive shall constitute a "specific directive" for the purposes of Article 2 (2) of Council Directive 89/336/EEC (*) with effect from 1 January 1996.2. Vehicles, components or separate technical units approved pursuant to this Directive shall be considered to fulfil the provisions of other directives, cited in Annex IV to Council Directive 92/53/EEC (**), which refer to electromagnetic compatibility.(*) OJ No L 139, 23. 5. 1989, p. 19.(**) OJ No L 225, 10. 8. 1992, p. 1.';5. The Annexes shall be replaced by the Annex to this Directive.Article 21. With effect from 1 December 1995, Member States may not, on grounds relating to electromagnetic compatibility:- refuse, in respect of any given type of vehicle, to grant EEC type-approval or national type-approval,- refuse, in respect of any given type of component or separate technical unit, to grant EEC component or technical unit type-approval, or- prohibit the registration, sale or entry into service of vehicles,- prohibit the sale or use of components or separate technical units,if the vehicles, components or separate technical units comply with the requirements of Directive 72/245/EEC as amended by this Directive.2. With effect from 1 January 1996, Member States:- shall no longer grant EEC vehicle type-approval, EEC component type-approval or EEC separate technical unit type-approval, and- may refuse to grant national type-approval,for any type of vehicle, component or separate technical unit on grounds relating to electromagnetic compatibility, if the requirements of Directive 72/245/EEC, as amended by this Directive, are not fulfilled.3. Paragraph 2 shall not apply to vehicle types approved before 1 January 1996 pursuant to Directive 72/306/EEC nor to any subsequent extensions to these approvals.4. With effect from 1 October 2002, Member States:- shall consider certificates of conformity which accompany new vehicles in accordance with the provisions of Directive 70/156/EEC to be no longer valid for the purposes of Article 7 (1) of that Directive,- may refuse the registration, sale or entry into service of new vehicles which are not accompanied by a certificate of conformity in accordance with Directive 70/156/EEC, and- may refuse the sale and entry into service of new electrical/electronic sub-assemblies as components or separate technical unit,if the requirements of this Directive are not fulfilled.5. With effect from 1 October 2002 the requirements of Directive 72/245/EEC, relating to electrical/electronic sub-assemblies as components or separate technical units, as amended by this Directive, are applicable for the purposes of Article 7 (2) of Directive 70/156/EEC.6. Notwithstanding paragraphs 2 and 5, for the purposes of replacement parts, Member States shall continue to grant EEC type approval and to permit the sale and entry into service of components or separate technical units intended for use on vehicle types which have been approved before 1 January 1996 pursuant to either Directive 72/245/EEC or Directive72/306/EEC and, where applicable, subsequent extensions to these approvals.Article 3Item No 10 of Part I of Annex IV to Directive 70/156/EEC shall be amended to include an 'X' in each of the columns for vehicle category 0 under the heading 'Applicability'.Article 41. Member States shall bring into force the laws, regulations and administrative provisions necessary to comply with this Directive before 1 December 1995. They shall forthwith inform the Commission thereof.When Member States adopt these provisions, these shall contain a reference to this Directive or shall be accompanied by such reference at the time of their official publication. The procedure for such reference shall be adopted by Member States.2. Member States shall communicate to the Commission the texts of the main provisions of national law which they adopt in the field covered by this Directive.Article 5This Directive shall enter into force on the 20th day following its publication in the Official Journal of the European Communities.Article 6This Directive is addressed to the Member States.Done at Brussels, 31 October 1995.For the CommissionMartin BANGEMANNMember of the CommissionLIST OF ANNEXESANNEX 1 Requirements to be met by vehicles and electrical/electronic sub-assemblies fitted to a vehicle.ANNEX IIA Model information document for EEC type-approval of a vehicle with respect to electromagnetic compatibility.ANNEX IIB Model information document for EEC type-approval of an electrical/electronic sub-assembly with respect to electromagnetic compatibility.ANNEX IIIA Model: EEC type-approval certificate (vehicle)ANNEX IIIB Model: EEC type-approval certificate (electrical/electronic sub-assembly) ANNEX IV Method of measurement of radiated broadband electromagnetic emissions from vehicles.ANNEX V Method of measurement of radiated narrowband electromagnetic emissions from vehicles.ANNEX VI Method of testing for immunity of vehicles to electromagnetic radiation. ANNEX VII Method of measurement of radiated broadband electromagnetic emissions from electrical/electronic sub-assemblies.ANNEX VIII Method of measurement of radiated narrowband electromagnetic emissions from electrical/electronic sub-assemblies.ANNEX IX Method (s) of testing of immunity of electrical/electronic sub-assemblies to electromagnetic radiation.ANNEX IREQUIREMENTS TO BE MET BY VEHICLES AND ELECTRICAL/ELECTRONIC SUB-ASSEMBLIES FITTED TO A VEHICLE1. Scope1.1. This Directive applies to the electromagnetic compatibility of vehicles covered in Article 1, being vehicles or trailers (hereinafter referred to as vehicle(s)) as supplied by the vehicle manufacturer and to components or separate technical units intended for fitment in vehicles.2. Definitions2.1. For the purposes of this Directive:2.1.1. 'Electromagnetic compatibility' means the ability of a vehicle or component(s) or separate technical unit(s) to function satisfactorily in its electromagnetic environment without introducing intolerable electromagnetic disturbances to anything in that environment.2.1.2. 'Electromagnetic disturbance' means any electromagnetic phenomenon which may degrade the performance of a vehicle or component(s) or separate technical unit(s). An electromagnetic disturbance may be electromagnetic noise, an unwanted signal or a change in the propagation medium itself.2.1.3. 'Electromagnetic immunity' means the ability of a vehicle or component(s) or separate technical unit(s) to perform without degradation of performance in the presence of specified electromagnetic disturbances.2.1.4. 'Electromagnetic environment' means the totality of electromagnetic phenomena existing at a given location.2.1.5. 'Reference limit' means the nominal level to which type approval and conformity of production limit values are referenced.2.1.6. 'Reference antenna' for the frequency range 20 to 80 MHz: means a shortened balanced dipole being a half wave resonant dipole at 80 MHz, and for the frequency range above 80 MHz: means a balanced half wave resonant dipole tuned to the measurement frequency.2.1.7. 'Broadband emission' means an emission which has a bandwidth greater than that of a particular measuring apparatus or receiver.2.1.8. 'Narrowband emission' means an emission which has a bandwidth less than that of a particular measuring apparatus or receiver.2.1.9. 'Electrical/electronic system' means (an) electrical and/or electronic device(s) or set(s) of devices together with any associated electrical connections which form part of a vehicle but which are not intended to be type approved separately from the vehicle.2.1.10. 'Electrical/electronic sub-assembly' (ESA) means an electrical and/or electronic device or set(s) of devices intended to be part of a vehicle, together with any associated electrical connections and wiring, which performs one or more specialized functions. An ESA may be approved at the request of a manufacturer as either a 'component' or a 'separate technical unit (STU)' (see Directive 70/156/EEC, Article 2).2.1.11. 'Vehicle type' in relation to electromagnetic compatibility means vehicles which do not differ essentially in such respects as:2.1.11.1. the overall size and shape of the engine compartment;2.1.11.2. the general arrangement of the electrical and/or electronic components and the general wiring arrangement;2.1.11.3. the primary material of which the body or shell (if applicable) of the vehicle is constructed (for example, a steel, aluminium or fibreglass body shell). The presence of panels of different material does not change the vehicle type provided the primary material of the body is unchanged. However, such variations must be notified.2.1.12. An 'ESA type' in relation to electromagnetic compatibility means ESAs which do not differ in such essential respects as:2.1.12.1. the function performed by the ESA;2.1.12.2. the general arrangement of the electrical and/or electronic components, if applicable.3. Application for EEC type-approval3.1. Approval of a vehicle type3.1.1. The application for approval of a vehicle type, with regard to its electromagnetic compatibility pursuant to Article 3 (4) of Directive 70/156/EEC shall be submitted by the vehicle manufacturer.3.1.2. A model for the information document is given in Annex IIA.3.1.3. The vehicle manufacturer shall draw up a schedule describing all projected combinations of relevant vehicle electrical/electronic systems or ESAs, body styles (1), variations in body material (1), general wiring arrangements, engine variations, left-hand/right-hand drive versions and wheelbase versions. Relevant vehicle electrical/electronic systems or ESAs are those which may emit significant broadband or narrowband radiation and/or those which are involved in the driver's direct control (see paragraph 6.4.2.3 of this Annex) of the vehicle.3.1.4. A representative vehicle shall be selected from this schedule for the purpose of being tested, in mutual agreement between the manufacturer and the competent authority. This vehicle shall represent the vehicle type (see Appendix 1 to Annex IIA). The choice of vehicle shall be based on the electrical/electronic systems offered by the manufacturer. One more vehicle may be selected from this schedule for the purpose of being tested if it is considered by mutual agreement between the manufacturer and the competent authority that different electrical/electronic systems are included which are likely to have a significant effect on the vehicle's electromagnetic compatibility compared with the first representative vehicle.3.1.5. The choice of the vehicle(s) in conformity with paragraph 3.1.4 is limited to vehicle/electrical/electronic system combinations intended for actual production.3.1.6. The manufacturer may supplement the application with a report from tests which have been carried out. Any such data provided may be used by the approval authority for the purpose of drawing up the type-approval certificate.(1) If applicable.3.1.7. If the technical service responsible for the type-approval test carries out the test itself, then a vehicle representative of the type to be approved, according to paragraph 3.1.4 shall be provided.3.2. Approval of a type of ESA3.2.1. The application for approval of a type of ESA with regard to its electromagnetic compatibility pursuant to Article 3 (4) of Directive 70/156/EEC shall be submitted by the vehicle manufacturer or by the manufacturer of the ESA.3.2.2. A model for the information document is given in Annex IIB.3.2.3. The manufacturer may supplement the application with a report from tests which have been carried out. Any such data provided may be used by the approval authority for the purpose of drawing up the type-approval certificate.3.2.4. If the technical service responsible for the type-approval test carries out the test itself, then a sample of the ESA system representative of the type to be approved shall be provided, if necessary, after discussion with the manufacturer on, for example, possible variations in the layout, number of components, number of sensors. If the technical service deems it necessary, it may select a further sample.3.2.5. The sample(s) must be clearly and indelibly marked with the manufacturer's trade name or mark and the type designation.3.2.6. Where applicable, any restrictions on use should be identified. Any such restrictions should be included in Annexes IIB and/or IIIB.4. Type-approval4.1. Routes to type-approval4.1.1. Type-approval of a vehicleThe following alternative routes to type-approval of a vehicle may be used at the discretion of the vehicle manufacturer.4.1.1.1. Approval of a vehicle installationA vehicle installation may achieve type-approval directly by following the provisions laid down in paragraph 6 of this Annex. If this route is chosen by a vehicle manufacturer, no separate testing of electrical/electronic systems or ESAs is required.4.1.1.2. Approval of vehicle type by testing of individual ESAsA vehicle manufacturer may obtain approval for the vehicle by demonstrating to the approval authority that all the relevant (see paragraph 3.1.3 of this Annex) electrical/electronic systems or ESAs have individually been approved in accordance with this Directive and have been installed in accordance with any conditions attached thereto.4.1.1.3. A manufacturer, if he wishes, may obtain approval to this Directive if the vehicle has no equipment of the type which is subject to immunity or emission tests. The vehicle shall have no systems as specified in paragraph 3.1.3 (immunity) and no spark ignition equipment. Such approvals do not require testing.4.1.2. Type-approval of an ESAType-approval may be granted to an ESA to be fitted either to any vehicle type or to a specific vehicle type or types requested by the manufacturer. ESAs involved in the direct control of vehicles will normally receive type-approval in conjunction with a vehicle manufacturer.4.2. Granting of type-approval4.2.1. Vehicle4.2.1.1. If the representative vehicle fulfils the requirements of this Directive, EEC type-approval pursuant to Article 4 (3), and if applicable, Article 4 (4) of Directive 70/156/EEC shall be granted.4.2.1.2. A model for the EEC type-approval certificate is given in Annex IIIA.4.2.2. ESA4.2.2.1. If the representative ESA system(s) fulfil(s) the requirements of this Directive, EEC type-approval pursuant to Article 4 (3), and if applicable, Article 4 (4) of Directive 70/156/EEC shall be granted.4.2.2.2. A model for the EEC type-approval certificates is given in Annex IIIB.4.2.3. In order to draw up the certificates referred to in paragraph 4.2.1.2 or 4.2.2.2, the competent authority of the Member State granting the approval may use a report prepared by an approved or recognized laboratory or in accordance with the provisions of this Directive.4.3. Amendments to approvals4.3.1. In the case of amendments to approvals granted pursuant to this Directive, the provisions of Article 5 of Directive 70/156/EEC shall apply.4.3.2. Amendment of a vehicle type-approval by ESA addition or substitution.4.3.2.1. Where a vehicle manufacturer has obtained approval for a vehicle installation and wishes to fit an additional or substitutional electrical/electronic system or ESA which has already received approval pursuant to this Directive, and which will be installed in accordance with any conditions attached thereto, the vehicle approval may be amended without further testing. The additional or substitutional electrical/electronic system or ESA shall be considered as part of the vehicle for conformity of production purposes.4.3.2.2. Where the additional or substitutional part(s) has (have) not received approval pursuant to this Directive, and if testing is considered necessary, the whole vehicle shall be deemed to comply if the new or revised part(s) can be shown to comply with the relevant requirements of paragraph 6 or if, in a comparative test, the new part can be shown not to be likely to adversely affect compliance of the vehicle type.4.3.2.3. The addition by a vehicle manufacturer to an approved vehicle of standard domestic or business equipment, other than mobile communication equipment (*) which complies with Directive 89/336/EEC, and is installed according to the recommendations of the equipment and vehicle manufacturers, or the substitution or removal thereof, shall not invalidate the vehicle approval. This shall not preclude vehicle manufacturers fitting communication equipment with suitable installations guidelines developed by the vehicle manufacturer and/or manufacturer(s) of such communication equipment. The vehicle manufacturer shall provide evidence (if requested by the test authority) that vehicle performance is not adversely affected by such transmitters. This can be a statement that the power levels and installationare such that the immunity levels of this Directive offer sufficient protection when subject to transmission alone, i.e. excluding transmission in conjunction with the tests specified in paragraph 6. This Directive does not authorize the use of a communication transmitter when other requirements on such equipment or its use apply. A vehicle manufacturer may refuse to install in his vehicle standard domestic or business equipment which complies with Directive 89/336/EEC.(*) For example: radio telephone and citizens band radio.5. Marking5.1. Every ESA conforming to a type approved pursuant to this Directive shall bear an EEC type-approval mark.5.2. This mark shall consist of a rectangle surrounding the letter 'e' followed by the distinguishing number or letters of the Member State which has granted type-approval:1 Germany2 France3 Italy4 the Netherlands6 Belgium9 Spain11 the United Kingdom13 Luxembourg18 Denmark21 Portugal23 GreeceIRL IrelandIt must also include in the vicinity of the rectangle the four-digit sequential number (with leading zeros as applicable) - hereinafter referred to as 'base approval number' - contained in Section 4 of the type-approval number shown on the EEC type-approval certificate issued for the type of device in question (see Annex IIIB), preceded by the two figures indicating the sequence number assigned to the most recent major technical amendment to Directive 72/245/EEC on the date EEC component type-approval was granted. In this Directive the sequence number is 02.5.3. The EEC type-approval mark must be affixed to the main part of the ESA (e.g. the electronic control unit) in such a way as to be clearly legible and indelible.5.4. An example of the EEC type-approval mark is shown in Appendix 7.5.5. No marking is required for electrical/electronic systems included in vehicle types approved by this Directive.5.6. Markings on ESAs in compliance with paragraph 5.3 need not be visible when the ESA is installed in a vehicle.6. Specifications6.1. General specification6.1.1. A vehicle (and its electrical/electronic system(s) or ESAs) shall be so designed, constructed and fitted as to enable the vehicle, in normal conditions of use, to comply with the requirements of this Directive.6.2. Specifications concerning broadband electromagnetic radiation from vehicles fitted with spark ignition.6.2.1. Method of measurementThe electromagnetic radiation generated by the vehicle representative of its type shall be measured using the method described in Annex IV at either of the defined antenna distances. The choice shall be made by the vehicle manufacturer.6.2.2. Vehicle broadband reference limits6.2.2.1. If measurements are made using the method described in Annex IV using a vehicle-to-antenna spacing of 10,0 ± 0,2 m, the radiation reference limits shall be 34 dB microvolts/m (50 microvolts/m) in the 30 to 75 MHz frequency band and 34 to 45 dB microvolts/m (50 to 180 microvolts/m) in the 75 to 400 MHz frequency band, this limit increasing logarithmically (linearly) with frequencies above 75 MHz as shown in Appendix 1 to this Annex. In the 400 to 1 000 MHz frequency band the limit remains constant at 45 dB microvolts/m (180 microvolts/m).6.2.2.2. If measurements are made using the method described in Annex IV using a vehicle-to-antenna spacing of 3,0 ± 0,05 m, the radiation reference limits shall be 44 dB microvolts/m (160 microvolts/m) in the 30 to 75 MHz frequency band and 44 to 55 dB microvolts/m (160 to 562 microvolts/m) in the 75 to 400 MHz frequency band, this limit increasing logarithmically (linearly) with frequencies above 75 MHz as shown in Appendix 2 to this Annex. In the 400 to 1 000 MHz frequency band the limit remains constant at 55 dB microvolts/m (562 microvolts/m).6.2.2.3. On the vehicle representative of its type, the measured values, expressed in dB microvolts/m, (microvolts/m), shall be at least 2,0 dB (20 %) below the reference limits.6.3. Specifications concerning narrowband electromagnetic radiation from vehicles.6.3.1. Method of measurementThe electromagnetic radiation generated by the vehicle representative of its type shall be measured using the method described in Annex V at either of the defined antenna distances. The choice shall be made by the vehicle manufacturer.6.3.2. Vehicle narrowband reference limits6.3.2.1. If measurements are made using the method described in Annex V using a vehicle-to-antenna spacing of 10,0 ± 0,2 m, the radiation-reference limits shall be 24 dB microvolts/m (16 microvolts/m) in the 30 to 75 MHz frequency band and 24 to 35 dB microvolts/m (15 to 56 microvolts/m) in the 75 to 400 MHz frequency band, this limit increasing logarithmically (linearly) with frequencies above 75 MHz as shown in Appendix 3 of this Annex. In the 400 to 1 000 MHz frequency band the limit remains constant at 35 dB microvolts/m (56 microvolts/m).6.3.2.2. If measurements are made using the method described in Annex V using a vehicle-to-antenna spacing of 3,0 ± 0,05 m, the radiation reference limit shall be 34 dB microvolts/m (50 microvolts/m) in the 30 to 75 MHz frequency band and 34 to 45 dB microvolts/m (50 to 180 microvolts/m) in the 75 to 400 MHz frequency band, this limit increasing logarithmically (linearly) with frequencies above 75 MHz as shown in Appendix 4 to this Annex. In the 400 to 1 000 MHz frequency band the limit remains constant at 45 dB microvolts/m (180 microvolts/m).。