CRAC Class C (2025) — Questions 191–200

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.

U0233. 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 K3TRX/VE6 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K3TRX/VE6可以拼读为：

Exam tips · 考试提示

K3TRX/VE6 maps to: K=Kilo, 3=Three, T=Tango, R=Romeo, X=Xray, "/Portable"=Portable, V=Victor, E=Echo, 6=Six. Option A is correct; the "/VE6" suffix indicates portable operation in Alberta, Canada. The others spell different calls.

U0234. 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 3DA0FZ/DL5CMP 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 3DA0FZ/DL5CMP可以拼读为：

Exam tips · 考试提示

3DA0FZ/DL5CMP maps to: 3=Three, D=Delta, A=Alfa, 0=Zero, F=Foxtrot, Z=Zulu, "/Portable", D=Delta, L=Lima, 5=Five, C=Charlie, M=Mike, P=Papa. Option A is correct; 3DA is Swaziland (Eswatini). The others spell different calls.

U0676. Amateur radio operators sometimes use well-known alternative phonetic alphabets to spell out call signs, names, and words during contacts; these are common in DX contacts. "Japan America Two Italy Germany Yokohama" is:

业余无线电爱好者有时会在通联中使用广为流传的另类字母解释法来拼读呼号、名字和文字。这些常见于DX通联。Japan America Two Italy Germany Yokohama为：

Exam tips · 考试提示

This is a playful "alternative" phonetic alphabet where each word stands for a letter or digit: Japan=J, America=A, Two=2, Italy=I, Germany=G, Yokohama=Y, giving JA2IGY (A). The other options encode different word strings.

U0677. Amateur radio operators sometimes use well-known alternative phonetic alphabets to spell out call signs, names, and words during contacts; these are common in DX contacts. "Florida Five England Queen United" is:

业余无线电爱好者有时会在通联中使用广为流传的另类字母解释法来拼读呼号、名字和文字。这些常见于DX通联。Florida Five England Queen United为：

Exam tips · 考试提示

Using the same novelty phonetic alphabet: Florida=F, Five=5, England=E, Queen=Q, United=U, giving F5EQU (A). The other strings come from different word sets.

U0678. Amateur radio operators sometimes use well-known alternative phonetic alphabets to spell out call signs, names, and words during contacts; these are common in DX contacts. "Washington Honolulu Eight Zanzibar Denmark Portugal" is:

业余无线电爱好者有时会在通联中使用广为流传的另类字母解释法来拼读呼号、名字和文字。这些常见于DX通联。 Washington Honolulu Eight Zanzibar Denmark Portugal为：

Exam tips · 考试提示

Washington=W, Honolulu=H, Eight=8, Zanzibar=Z, Denmark=D, Portugal=P, giving WH8ZDP (A). The other options encode different word sets.

U0679. Amateur radio operators sometimes use well-known alternative phonetic alphabets to spell out call signs, names, and words during contacts; these are common in DX contacts. "Sugar Five Three Mexico Norway Ontario" is:

业余无线电爱好者有时会在通联中使用广为流传的另类字母解释法来拼读呼号、名字和文字。这些常见于DX通联。Sugar Five Three Mexico Norway Ontario为：

Exam tips · 考试提示

Sugar=S, Five=5, Three=3, Mexico=M, Norway=N, Ontario=O, giving S53MNO (A). The other options encode different word sets. CQ 呼叫与发起联络 CQ Calls and Initiating Contacts

U0243. An amateur station should listen before transmitting (monitor first). But sometimes, because you cannot hear one side of an ongoing contact, you may mistake the frequency for being clear, and a "CQ" could then interfere with others. To minimize this, you can:

业余电台在发起呼叫前应先守听。但是，我们有时会因听不到通信中的某一方而误认为频率空闲。此时呼叫“CQ”有可能干扰他人联络。为尽量避免这种情况，我们可以：

Exam tips · 考试提示

Good practice (守听 first, then a "is this frequency in use?" query) avoids interrupting an in-progress contact you cannot fully hear. Option A is correct. B uses a non-standard phrase; C/D transmit first and only yield later, which can cause harmful interference and violates listen-before-transmit etiquette.

U0244. BH1ZZZ wishes to join an ongoing contact between two other stations. The correct method is:

BH1ZZZ希望加入两个电台相互之间的联络。正确的方法是：

Exam tips · 考试提示

To break into an existing QSO politely, you wait for a pause, send a brief "break", identify, and wait for an invitation. Option A is the proper procedure. B interrupts mid-transmission; C (power up and repeat) is rude and potentially interfering; D ignores etiquette even among friends.