CRAC Class B (2025) — Questions 221–230

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：

Exam tips · 考试提示

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：

Exam tips · 考试提示

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：

Exam tips · 考试提示

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.

U0231. 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 BS7H 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BS7H可以拼读为：

Exam tips · 考试提示

BS7H maps to: B=Bravo, S=Sierra, 7=Seven, H=Hotel. Option A is correct; BS7 is the scarce Scarborough Reef (Huangyan Island) prefix, a prized DX entity. The other options spell 3DA0FZ/DL5CMP, K3TRX/VE6, and JA2IGY.

U0232. 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 JA2IGY 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JA2IGY可以拼读为：

Exam tips · 考试提示

JA2IGY maps to: J=Juliett, A=Alfa, 2=Two, I=India, G=Golf, Y=Yankee. Option A is correct; JA is the Japan prefix. The others spell different calls.