CRAC Class A (2025) — Questions 201–210

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U0200. The principle laid down by the International Telecommunication Union for determining the radiated power of a transmitting station is:

国际电联规定的确定发射电台辐射功率的原则为：

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The ITU principle (Radio Regulations, No. 21.1) is that a station should radiate only the minimum power necessary to give a satisfactory service (A). The other options promote maximum power, which is contrary to interference minimization.

U0201. A club has arranged a net frequency for its members to exchange technical information. When another amateur station, following normal operating practice, requests to join the communication, the principle of handling it should be:

某俱乐部约定了一个成员业余电台之间交流技术的网络频率， 当遇有其他业余电台按通信惯例要求参加通信时，处理原则应 为：

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All amateur stations have equal rights to amateur frequencies; a club cannot claim an exclusive "private" frequency, so any station requesting to join must be welcomed (A). B/C/D attempt to grant the club priority or exclusivity, which violates equal-access principle.

U0202. The ITU Radio Regulations prohibit all stations from emitting the following kind of wave:

ITU《无线电规则》禁止所有电台发射下列种类的电波：

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The ITU Radio Regulations prohibit the emission of damped waves (阻尼波) by all stations (A). AM, FM, and PM are all authorized emission types (B/C/D are permitted).

U0203. Which of the following illegal acts will be handled by the radio management authority in accordance with the Radio Regulations of the PRC? (Choose all that apply.)

下列哪些违法行为将由无线电管理机构依照《中华人民共和国 无线电管理条例》的规定处理：

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All four are unlawful acts handled under the Radio Regulations of the PRC (《中华人民共和国无线电管理条例》): (A) illegal interference with radio services; (B) leaking national-security radio data abroad; (C) unauthorized devising/use of call signs; (D) transmitting/receiving outside license particulars or misusing inadvertently received information. Each violates the regulation's prohibitions.

U0204. The principles for amateur stations using amateur-service frequencies are: (Choose all that apply.)

业余无线电台使用业余业务频率使用原则：

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When using amateur-service frequencies, an amateur station needs no radio-frequency use license and is exempt from frequency occupancy fees (A, B). C and D are the opposite of the preferential treatment granted to amateur radio.

U0205. The lowest band allocated by our country's Radio Frequency Allocation Regulations to the amateur service is 135.7–137.8 kHz; this 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低频段 为135.7-137.8kHz，属于无线电频谱的下列频段（波段）：

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135.7–137.8 kHz lies in the low-frequency (低频/LF, also called 长波 long wave) band, 30–300 kHz (A). VLF is 3–30 kHz, so B is wrong; C/D are not standard amateur-designated bands here.

U0206. The 1,800 kHz–2,000 kHz allocated by our country's Radio Frequency Allocation Regulations to the amateur service 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 1,800kHz-2,000kHz属于无线电频谱的下列频段（波段）：

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1800–2000 kHz (the 160 m band) is in the medium-frequency (中 频/MF, 中波 medium wave) range, 300 kHz–3 MHz (A). LF is below 300 kHz and HF starts at 3 MHz, so C/D are wrong; B is VHF which is far higher.

U0207. The 28 MHz–29.7 MHz allocated by our country's Radio Frequency Allocation Regulations to the amateur service 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28MHz- 29.7MHz属于无线电频谱的下列频段（波段）：

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28–29.7 MHz (the 10 m band) is in the high-frequency (高频/HF, 短 波 short wave) range, 3–30 MHz (A). MF is below 3 MHz and VHF starts at 30 MHz, so B/C/D are wrong.

U0208. The 50 MHz–54 MHz allocated by our country's Radio Frequency Allocation Regulations to the amateur service 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50MHz- 54MHz属于无线电频谱的下列频段（波段）：

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50–54 MHz (the 6 m band) is in the very-high-frequency (甚高 频/VHF, 米波 metric wave) range, 30–300 MHz (A). HF is below 30 MHz; UHF/SHF are above 300 MHz, so B/C/D are wrong.

U0209. The band allocated by our country's Radio Frequency Allocation Regulations to the amateur service that is closest to the wireless broadband WiFi frequency, 2,300–2,450 MHz, 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无 线宽带WiFi 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 (the 2.3 GHz / 13 cm amateur band, near WiFi/ISM) is in the ultra-high-frequency (特高频/UHF, 分米波 decimetric wave) range, 300 MHz–3 GHz (A). VHF is below 300 MHz and SHF (厘米波) starts at 3 GHz, so B/D are wrong; C is HF.