T1C05: A valid Technician class call sign format

Q: Which of the following is a valid Technician class call sign format?

The correct answer is A: KF1XXX. The correct answer is A: KF1XXX. This is a valid Technician class call sign format. Technician class call signs follow the format of a single letter prefix (K, N, or W), followed by a number (0-9), and then one to three additional letters. The format KF1XXX fits this pattern: K (prefix), F (first letter), 1 (number), XXX (three additional letters). Call sign formats vary by license class and region. Technician class call signs typically have formats like KXXX, NXXX, or WXXX where is a number and XXX represents one to three letters. The specific format depends on the call sign district (the number) and available call signs. Option B (KA1X) has only one letter after the number, which may be valid but is less common. Option C (W1XX) has only two letters after the number, which is also less common for new Technician licenses.

Updated: Dec 9, 2025 | Source: 2022-2026 Question Pool | Topic: T1C

T1C05T1C

Which of the following is a valid Technician class call sign format?

Previous Next

Deep Dive: T1C05

The correct answer is A: KF1XXX. This is a valid Technician class call sign format. Technician class call signs follow the format of a single letter prefix (K, N, or W), followed by a number (0-9), and then one to three additional letters. The format KF1XXX fits this pattern: K (prefix), F (first letter), 1 (number), XXX (three additional letters). Call sign formats vary by license class and region. Technician class call signs typically have formats like KXXX, NXXX, or WXXX where is a number and XXX represents one to three letters. The specific format depends on the call sign district (the number) and available call signs. Option B (KA1X) has only one letter after the number, which may be valid but is less common. Option C (W1XX) has only two letters after the number, which is also less common for new Technician licenses.

Why Other Answers Are Wrong

Option B: Incorrect. KA1X format may be valid for some older licenses, but it's not the typical format for new Technician class licenses, which usually have more letters after the number. Option C: Incorrect. W1XX format with only two letters after the number is less common for new Technician licenses. Option D: Incorrect. Not all options are correct. KF1XXX is the most typical format for a new Technician class license.

Exam Tip

Technician call sign = K/N/W + number + 1-3 letters. Remember: KF1XXX is a typical format - single letter prefix, number, then multiple letters. This is the most common format for new Technician licenses.

Memory Aid

**T**echnician = **T**ypical format **K**/**N**/**W** + number + letters (think 'T = K/N/W + # + XXX')

Real-World Example

You pass your Technician exam and receive your sequentially assigned call sign KF1ABC. This follows the standard Technician format: K (prefix), F (first letter), 1 (your call sign district), and ABC (three additional letters). This format is typical for new Technician class licenses issued by the FCC.

Source & Coverage

Question Pool: 2022-2026 Question Pool

Subelement: T1C

Reference: FCC Part 97.19

Key Concepts

Call sign formats Technician class Call sign structure FCC call signs

Verified Content

Question from the official FCC Technician Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the T1C topic.