Updated: Dec 9, 2025 | Source: 2023-2027 Question Pool | Topic: G1E
G1E10G1E

Why should an amateur operator normally avoid transmitting on 14.100, 18.110, 21.150, 24.930 and 28.200 MHz?

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Deep Dive: G1E10

The correct answer is A: A system of propagation beacon stations operates on those frequencies. You should normally avoid transmitting on 14.100, 18.110, 21.150, 24.930 and 28.200 MHz because a system of propagation beacon stations operates on those frequencies. These beacons help operators assess band conditions and propagation. Transmitting on these frequencies would interfere with beacon operation. For amateur radio operators, avoiding these frequencies is good operating practice. Understanding this helps maintain clear beacon frequencies.

Why Other Answers Are Wrong

Option B: Incorrect. These aren't automatic digital station frequencies - they're propagation beacon frequencies. Digital stations use different frequencies. Option C: Incorrect. These aren't emergency frequencies - they're propagation beacon frequencies. Emergency frequencies are different. Option D: Incorrect. These aren't FCC bulletin frequencies - they're propagation beacon frequencies. FCC bulletins use different frequencies.

Exam Tip

Avoid 14.100, 18.110, 21.150, 24.930, 28.200 MHz = propagation beacons. Think 'B'eacon 'F'requencies = 'B'etter 'F'ind another frequency. Propagation beacon stations operate on these frequencies - avoid them to prevent interference. Good operating practice.

Memory Aid

Avoid these frequencies = propagation beacons. Think 'B'eacon 'F'requencies = 'B'etter 'F'ind another. 14.100, 18.110, 21.150, 24.930, 28.200 MHz are propagation beacon frequencies. Avoid them to prevent interference.

Real-World Example

You want to call CQ on 14.100 MHz, but you hear a propagation beacon there. You should move to another frequency - 14.100 MHz is reserved for propagation beacons that help operators assess 20-meter band conditions. Transmitting on this frequency would interfere with the beacon's important function.

Source & Coverage

Question Pool: 2023-2027 Question Pool

Subelement: G1E

Reference: 2023-2027 Question Pool · G1 - Commission's Rules

Key Concepts

Propagation beacons Beacon frequencies Frequency avoidance Good operating practice

Verified Content

Question from the official FCC General Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the G1E topic.