CRAC Class A (2025) — Questions 211–220
U0210. The 430–440 MHz amateur band is closest to the operating frequencies of public walkie-talkies (citizen-band radios). If an amateur wishes to modify the amateur station configuration to "extend" it and communicate with public walkie-talkie users, they should note:
430-440MHz业余频段与公众对讲机的工作频率最为接近。如 果业余无线电爱好者希望通过改变业余电台的配置，将之"扩 频"并与公众对讲机持有者通信，则需注意：
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An amateur station may only communicate within the amateur service; communicating with public walkie-talkie (citizen-band) users is outside the amateur service and is prohibited (A). B/C/D all wrongly assume such cross-service communication is permissible under some power limit.
U0211. The band allocated by our country's Radio Frequency Allocation Regulations to the amateur service that is closest to the WiFi LAN frequency, 2,300–2,450 MHz, belongs to the following radio- spectrum band:
我国《无线电频率划分规定》划分给业余业务使用的最接近Wi- Fi局域网频率的频段为2,300-2,450MHz，属于无线电频谱的下 列频段（波段）：
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2300–2450 MHz is UHF (ultra high frequency, 300 MHz–3 GHz) (A). VHF is below 300 MHz, HF below 30 MHz, and SHF starts at 3 GHz.
U0212. The band allocated by our country's Radio Frequency Allocation Regulations to the amateur service that is closest to the C-band satellite TV broadcast frequency, 5.650–5.850 GHz, belongs to the following radio-spectrum band (waveband):
我国《无线电频率划分规定》划分给业余业务使用的最接近C波 段卫星电视广播频率的频段是5.650-5.850GHz，属于无线电频 谱的下列频段（波段）：
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5.65–5.85 GHz (the 5 cm amateur band) is in the super-high- frequency (超高频/SHF, 厘米波 centimetric wave) range, 3–30 GHz (A). UHF ends at 3 GHz and EHF starts at 30 GHz, so B/C/D are wrong.
U0213. The band allocated by our country's Radio Frequency Allocation Regulations to the amateur service that is closest to the Ku-band satellite TV broadcast frequency, 10–10.5 GHz, belongs to the following radio-spectrum band (waveband):
我国《无线电频率划分规定》划分给业余业务使用的最接近Ku 波段卫星电视广播频率的频段10-10.5GHz，属于无线电频谱的 下列频段（波段）：
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10–10.5 GHz (the 3 cm amateur band) is SHF (超高频/厘米波, 3–30 GHz) (A). UHF ends at 3 GHz and EHF begins at 30 GHz, so B/C/D are wrong.
U0214. The highest band allocated by our country's Radio Frequency Allocation Regulations to the amateur service is 241 GHz–250 GHz, which belongs to the following radio-spectrum band (waveband):
我国《无线电频率划分规定》划分给业余业务使用的最高频段 为241GHz-250GHz，属于无线电频谱的下列频段（波段）：
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241–250 GHz is in the extremely-high-frequency (极高频/EHF, 毫米 波 millimetric wave) range, 30–300 GHz (A). SHF ends at 30 GHz, UHF at 3 GHz, and THF (至高频) begins above 300 GHz, so B/C/D are wrong. 无线电通信的一般规定与业余电台操作 2 C H A P T E R General Rules of Radio Communication and Operating Practice 本章讲解国际区域划分、CQ 呼叫与联络程序、Q 简语、发射类别、数字模式以及 DX / 竞赛操作规范。This chapter covers ITU regions, CQ calls and contact procedure, Q-codes, emission classes, digital modes, and DX/contest operating conventions. 国际无线电区域划分 International Radio Region Division
U0215. To divide radio frequencies worldwide, the International Telecommunication Union (ITU) Radio Regulations prescribe the following regional division:
为在世界范围内划分无线电频率，国际电信联盟《无线电规 则》规定了如下区域划分：
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The ITU Radio Regulations divide the world into 3 Regions for frequency planning, and China (along with most of Asia and Oceania) is in Region 3 (A). The other options describe fictitious region counts.
U0216. In amateur radio administration we often use the method of dividing the globe into 3 radio-management Regions. The international body that devised this method and the document it published are:
在业余无线电管理实践中，我们常会用到把全球分为3个无线电 管理区域的划分办法。制定该方法的国际机构及其公布的文件 为：
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The 3-Region division is established by the 国际电信联盟 (International Telecommunication Union, ITU) in its 《无线电规 则》 (Radio Regulations) (A). ARRL, IARU, and CQ are not the source of this regulatory division.
U0217. The ITU regional division has a detailed set of rules. In summary, it is roughly:
ITU的区域划分有一套详尽规则。若概要描述则大致为：
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Region 1 = Europe, Asian Russia, Mongolia and part of NW Asia; Region 2 = the Americas; Region 3 = the rest of Asia and Oceania (A). The other options scramble which continent is which Region.
U0218. Amateur frequency allocation differs slightly among the 3 ITU radio-management Regions. The 40 m amateur band in ITU Region 3 is:
业余无线电频率划分在ITU的3个无线电管理分区中略有不同。 ITU三区的40米业余波段为：
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In ITU Region 3 (China), the 40 m band is 7.000–7.200 MHz (A). The 7.000–7.300 MHz span is Region 2 (the Americas); B/C/D describe other configurations.
U0219. Voice contacts on the 2 m band are usually at 144.035– 145.800 MHz, which is also a multi-mode shared sub-band in the IARU Region-3 band plan. Suppose a station is operating FM there; with an emission bandwidth below 20 kHz and a frequency tolerance better than ±2 kHz, the range within which its main carrier may be set is:
2米波段的话音联络通常位于144.035-145.800MHz。这也是 IARU第3区波段规划中的一个多模式共用细分频段。假设一部 业余电台正以FM方式在该频段参与通联，发射带宽小于20kHz 并且频率容限优于±2kHz，则该台的主载波设置范围可以是：
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To keep the whole FM emission inside 144.035–145.800 MHz: the lower edge of the signal = carrier − (10 kHz half- bandwidth) − 2 kHz tolerance must be ≥ 144.035, giving carrier ≥ 144.047 MHz; the upper edge = carrier + 10 kHz + 2 kHz must be ≤ 145.800, giving carrier ≤ 145.788 MHz. So the carrier range is 144.047–145.788 MHz (A).