CRAC Class C (2025) — Questions 181–190

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U0224. In the 144 MHz amateur band, the segment reserved for the amateur-satellite service, which voice and other communication modes should not occupy, is:

144MHz业余频段中留给卫星业余业务，话音及其他通信方式 不应占用的频段为：

Exam tips · 考试提示

The 2 m (144 MHz) band plan reserves the top end, 145.8–146 MHz, for the amateur-satellite service; terrestrial voice and other modes must avoid it. Option A is correct. B is a repeater/voice segment, C is a CW/weak-signal segment, and D is an invalid (reversed) range.

U0225. In the 430 MHz amateur band, the segment reserved for the amateur-satellite service, which voice and other communication modes should not occupy, is:

430MHz业余频段中留给卫星业余业务，话音及其他通信方式 不应占用的频段为：

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The 70 cm (430 MHz) band plan reserves 435–438 MHz for the amateur-satellite service; terrestrial modes must not occupy it. Option A is correct. B/C/D are normal terrestrial voice/repeater or shared segments.

U0673. Amateur radio operators often use the concept of "CQ zone" when calculating DX communication results or applying for awards. The civilian body that defined these zones and the document it published are:

业余无线电爱好者在计算DX通信成绩或在申请奖状时经常用 到"CQ分区"的概念。制定该分区的民间机构及其公布的文件 为：

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The 40 CQ zones (used for the WAZ award) were introduced by the US magazine CQ in its WAZ (Worked All Zones) award rules (A). The ARRL, IARU and RSGB are not the originating publishers of the CQ-zone scheme.

U0674. Which of the following "CQ zones" lie within China's territory?

以下哪些"CQ分区"位于我国境内：

Exam tips · 考试提示

Mainland China spans CQ zones 23, 24 and 27 (A). Zones 42/43/44 and 50 are the ITU-zone numbers (not CQ zones) for China, so B, C (incomplete) and D are wrong.

U0675. "ITU zones" are the basis for amateur radio operators joining IARU activities and calculating communication results. Which of the following "ITU zones" lie within China's territory?

"ITU分区"是业余无线电爱好者参加IARU相关活动并计算通信 成绩的基础。以下哪些"ITU分区"位于我国境内：

Exam tips · 考试提示

China spans ITU zones 33, 42, 43, 44 and 50 (A). Options 23/24/27 are CQ-zone numbers, not ITU zones, so C and D are wrong; B omits zone 50.

U0226. During a contact, what method lets you clearly convey the English letters in a call sign or important message?

通话时，有什么方法可以让你清晰表述呼号或重要消息中的英 语字母？

Exam tips · 考试提示

To make individual letters unambiguous on air, amateurs use the standard phonetic alphabet (字母解释法, e.g., Bravo, Hotel) where each letter is spoken as a code word. This is the universally accepted method; analogies, Morse, or AI reading are not the standard spoken technique.

U0227. When a call sign, term, or necessary text must be spelled out, amateur radio operators generally use the spelling method prescribed by the ITU phonetic alphabet. The call sign BH1XYZ is spelled as:

需要拼出呼号、术语和必要的文字时，业余无线电爱好者普遍 使用ITU语音字母表中规定的字母拼读法。呼号BH1XYZ可以 拼读为：

Exam tips · 考试提示

Each character of BH1XYZ maps to the ITU phonetic alphabet: B=Bravo, H=Hotel, 1=One, X=Xray, Y=Yankee, Z=Zulu. Option A is the correct spelling; the others spell different call signs.

U0228. When a call sign, term, or necessary text must be spelled out, amateur radio operators generally use the spelling method prescribed by the ITU phonetic alphabet. The call sign B7CRA is spelled as:

需要拼出呼号、术语和必要的文字时，业余无线电爱好者普遍 使用ITU语音字母表中规定的字母拼读法。呼号B7CRA可以拼 读为：

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B7CRA maps to: B=Bravo, 7=Seven, C=Charlie, R=Romeo, A=Alfa. Option A is the correct spelling; the others correspond to BH1XYZ, 4U1UN, and VR2ZQW respectively.

U0229. When a call sign, term, or necessary text must be spelled out, amateur radio operators generally use the spelling method prescribed by the ITU phonetic alphabet. The call sign 4U1UN is spelled as:

需要拼出呼号、术语和必要的文字时，业余无线电爱好者普遍 使用ITU语音字母表中规定的字母拼读法。呼号4U1UN可以拼 读为：

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4U1UN maps to: 4=Four, U=Uniform, 1=One, U=Uniform, N=November. Option A is correct; "4U" prefixes are used by UN/ITU stations. The others spell different call signs.

U0230. When a call sign, term, or necessary text must be spelled out, amateur radio operators generally use the spelling method prescribed by the ITU phonetic alphabet. The call sign VR2ZQW is spelled as:

需要拼出呼号、术语和必要的文字时，业余无线电爱好者普遍 使用ITU语音字母表中规定的字母拼读法。呼号VR2ZQW可以 拼读为：

Exam tips · 考试提示

VR2ZQW maps to: V=Victor, R=Romeo, 2=Two, Z=Zulu, Q=Quebec, W=Whiskey. Option A is correct; VR2 is a Hong Kong prefix. The others are unrelated call signs.