CRAC Class B (2025) — Questions 521–530

U0822. A 20-year-old female university student from Beijing participates in the IARU HF World Championship SSB single- operator category.

北京某20岁女大学生参加IARU短波世界锦标赛SSB单人组比赛。她发给别人的信号报告可以是：

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In the IARU HF Championship the exchange is an RSQ-style report: the first two digits are the RS report (readability 5, strength 9) and the last two form the serial number of the contact sent. A valid report such as 5944 (59 + serial 44) is acceptable. Per the official key, 5944 is the correct choice.

U0823. A 20-year-old female university student from Beijing participates in the ALL ASIAN DX CONTEST SSB single- operator category. Signal reports she could send to others are: (Choose all that apply.)

北京某20岁女大学生参加ALL ASIAN DX CONTEST SSB单人组比赛。她发给别人的信号报告可以是：

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The ALL ASIAN DX Contest exchange is an RS report plus the operator's age (two digits). A 20-year-old would send 59 + 20 = 5920 (B). The official key also accepts 5900 (A), where 00 is used when age is not disclosed. Options C (5944) and D (5924) encode ages 44/24 that do not match the operator, so they are not correct for her.

U0824. A 20-year-old female university student from Beijing participates in the CQ WW CW contest.

北京某20岁女大学生参加CQ WW CW竞赛。她发给别人的信号报告可以是：

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CQ WW exchange is an RST report (599) plus the station's CQ zone (two digits). The Beijing area is in CQ zone 24 (per the exam key), so the report is 59924 (A). Options with 00/44/20 would imply zones 00/44/20, which are not the Beijing zone.

U0825. If during an amateur radio contest you hear the exchange message "599NJ", the contest is likely to be:

若在某业余无线电比赛期间听到交换消息"599NJ"，该比赛可能是：

Exam tips · 考试提示

The exchange "599NJ" is an RST report (599) plus a US state/section (NJ = New Jersey). The ARRL 160-Meter Contest uses exchanges of "RST + state/province", so a two-letter US state abbreviation like NJ points to that contest (A). CQWW and CQ WPX use serial-number exchanges; ALL ASIAN uses "RST + age/zone" style, none of which yields a US state code.

U0826. Amateur radio operators often use the Maidenhead Grid Square Locator to indicate their station's location. For example, BR1KA's grid locator is OM89. This locating system is:

业余无线电爱好者经常使用梅登海德网格定位系统（Maidenhead Grid Square Locator）来标示自己的电台所在地。例如，BR1KA的网格定位是OM89。这种定位系统是：

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The Maidenhead Grid Square Locator (网格定位系统) is a geographic-reference system that divides the Earth's surface into grid squares using longitude and latitude (A). It is not a satellite positioning system (B), nor is it keyed to call-sign series (C) or administrative divisions (D). The example OM89 is a 4-character grid derived from longitude/latitude.

U0827. The Maidenhead grid locator system used in amateur radio contacts may have the encoding format:

业余无线电通联中用到的梅登海德网格定位系统，其编码格式可以是：

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The Maidenhead format alternates letter and digit pairs: a 4- character grid is two letters + two digits (e.g., OM89); a 6- character (subsquare) grid adds two more letters + two digits (e.g., OM89xx) (A). The other formats (pure digits, pure letters, or prefix-based) do not describe the Maidenhead scheme.

U0828. The encoding amateur radio operators use to mark their own station location with the Maidenhead grid locator may have 4 or 6 characters. The two differ in positioning accuracy: the difference is:

业余无线电爱好者使用梅登海德网格定位系统标示己方电台位置所用的编码可以具有4个或6个字符。二者的定位精度不同，区别为：

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A 4-character Maidenhead grid (field+square) spans 2° longitude × 1° latitude; adding the 2-letter subsquare (6 characters) narrows it to 5′ longitude × 2.5′ latitude (A). The other options mischaracterize the distinction (administrative, call-sign based, or mode-based).

U0829. To facilitate time calculation, the Earth is divided into several time zones; the method of dividing each theoretical time zone is:

为了便于计算时间，将地球划分为若干个时区，各理论时区的划分方法是：

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The theoretical time-zone system divides the Earth into 24 zones of 15° longitude each (360°/24 = 15°), with the prime meridian (0° longitude) through the center of zone 0 (A). The 12-zone versions (B, D) are wrong, and C misstates the boundaries as 15° multiples rather than centered on the prime meridian.

U0830. To facilitate time calculation, the Earth is divided into time zones; the naming rule of each theoretical time zone is:

为了便于计算时间，将地球划分为若干个时区，各理论时区的命名规则是：

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Zone 0 is centered on the prime meridian; moving east gives East 1–East 12 and moving west gives West 1–West 12 (A). There is no zone 13–24 in the standard scheme (B, C, D are wrong).

U0831. To facilitate time calculation, the Earth is divided into time zones; Beijing's situation is:

为了便于计算时间，将地球划分为若干个时区，北京的情况是：

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Beijing is in East 8 (UTC+8), so its local time is 8 hours ahead of zone 0 (UTC/GMT) time (A). Being east of the prime meridian means earlier (ahead) local time, not later.