CRAC Class B (2025) — Questions 511–520
U0812. To apply for the satellite and 6 m WAZ awards, at least how many zone QSL cards must be submitted?
申请卫星和6米WAZ奖状需要至少提交多少个区的QSL卡片？
Exam tips · 考试提示
The satellite WAZ and 6 m WAZ awards each require confirmation of 25 CQ zones (a reduced threshold compared with the standard 40-zone WAZ, because these modes/(bands cover fewer zones). The keyed answer is 25.
U0813. To apply for the 160 m WAZ award, at least how many zone QSL cards must be submitted?
申请160米WAZ奖状需要至少提交多少个区的QSL卡片？
Exam tips · 考试提示
Like the 6 m and satellite WAZ awards, the 160 m WAZ uses the reduced 25-zone requirement because Top Band propagation reaches fewer CQ zones. The keyed answer is 25.
U0814. On 14022 kHz many stations are eagerly sending their call signs. They are calling a rare station whose transmit frequency is 14020 kHz. If you want to work that station, you may:
在14022kHz有很多电台争相报出自己的呼号。他们是在呼叫 发射频率为14020kHz的一个稀有台。如果你要联络该台，你 可以：
Exam tips · 考试提示
In a "split" DX pile-up, the DX station transmits on 14020 kHz and receives (listens) on 14022 kHz. You monitor its transmit frequency to know when it is ready, then answer on its listening frequency (14022 kHz) with only your own call. Sending on its transmit frequency (B/D) or hammering away (C) would collide with the DX.
U0815. Taking Beijing as the center, the great-circle distances to the DXCC entities 3X, HZ, G, and OE, arranged from farthest to nearest, can be ordered as:
以北京为中心，则与DXCC实体3X、HZ、G、OE的大圆距离由 远及近可排列为：
Exam tips · 考试提示
From Beijing: 3X (Guinea, West Africa) is farthest, then G (United Kingdom), then OE (Austria), then HZ (Saudi Arabia) which is nearest. So the farthest-to-nearest order is 3X, G, OE, HZ.
U0816. When we use a directional antenna to contact amateur stations in Europe, we often point the antenna toward roughly 300° (ten o'clock). Correspondingly, if a European station wants to contact us, its antenna should roughly point toward:
我们使用定向天线联络欧洲的业余电台时常将天线指向大约 300度（十点钟）的方向。相应地，如果某个欧洲电台要联络 我们，其天线应大体指向：
Exam tips · 考试提示
Propagation is reciprocal: a beam pointed from Beijing toward Europe at ~300° must be met by a European beam pointed back toward Beijing. Per the official key, the European station's antenna points toward ~60° (two o'clock) — the reciprocal great-circle bearing from Europe back to Beijing.
U0817. To erect a horizontally polarized half-wave dipole in Beijing in an attempt to contact amateur stations in New York, considering the shortest propagation path, the antenna's orientation should roughly be:
在北京架设一副水平极化的半波长偶极天线以尝试联络纽约的 业余电台，若按最短的传播路径考虑，天线的走向应大致为：
Exam tips · 考试提示
A horizontal half-wave dipole radiates broadside (perpendicular to the wire). The shortest Beijing–New York path (over the North Pole region) runs roughly north–south, so the dipole should be oriented east–west so its broadside points north–south toward New York.
U0818. A fragment of a certain amateur station's CW signal is "B1CRA TEST UP 5", meaning:
某业余电台CW信号的片段为“B1CRA TEST UP 5”，意思 是：
Exam tips · 考试提示
In contest CW, "TEST" identifies contest operation and "UP 5" means the station is listening 5 kHz above its transmit (send) frequency (a split). B/C/D misread "UP 5" as a model number or a prefix.
U0819. During an HF contest, answering a contest station's CQ is a basic operation. We can first listen to it for a while to learn which frequency it is monitoring, and then, when it asks "QRZ?" or finishes its CQ call, perform the following operation:
在HF比赛时，回答参赛电台的CQ是一项基本操作。我们可以 先听他一会儿以了解该台正在守听什么频率，然后在其询问 “QRZ？”或结束CQ呼叫时完成如下操作：
Exam tips · 考试提示
When answering a CQ you transmit on the station's listening (receive) frequency, sending only your own full call so it can copy you; the running station already knows its own call, so repeating it (B/C) is unnecessary, and sending on its transmit frequency (D) collides with it.
U0820. In the CQ WW contest, which of the following categories is NOT allowed to use CW Skimmer to assist in finding QSO opportunities?
在CQWW比赛中，以下哪个组别不能使用CW Skimmer来辅 助发现QSO机会？
Exam tips · 考试提示
In CQ WW, the single-operator unassisted category (SOAB — single operator, all band) must not use any spotting assistance such as CW Skimmer. The assisted category (SOAB-A) explicitly may; multi-single (MS) and single-band (SOSB-20) have their own allowances. Per the key, SOAB is the prohibited one.
U0821. If during the IARU HF World Championship you hear a station sending "5NNJARL", its call sign is most likely:
若在IARU短波世界锦标赛期间听到某台发送“5NNJARL”， 该台呼号极可能是：
Exam tips · 考试提示
In the IARU HF Championship, HQ (Headquarters) stations send an RSQ-style report ending in a society code; "JARL" identifies the Japan Amateur Radio League. The Japanese HQ station uses the special call 8N1HQ (the "8N1" series denotes Japanese special-event/HQ stations). The keyed answer is 8N1HQ.