Ham Amateur Radio Technician Practice Exam

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

  1. They are reserved for military use

  2. They are used for satellite communications

  3. A system of propagation beacon stations operates on those frequencies

  4. They are restricted due to interference issues

The correct answer is: A system of propagation beacon stations operates on those frequencies

The frequencies listed, such as 14.100, 18.110, 21.150, 24.930, and 28.200 MHz, are designated for use by propagation beacon stations. Beacon stations transmit signals to help amateur operators determine propagation conditions between different locations and can assist in evaluating the RF path quality for future communications. These beacons provide a critical service to amateur radio operators by relaying information about the state of the ionosphere and other atmospheric conditions. When these channels are occupied by beacons transmitting continuously, it is essential for operators to refrain from using those frequencies for general communication. This ensures that the beacon signals, which are vital for propagation studies, are not interfered with, allowing for better communication planning and optimizing the use of other frequencies. Understanding the purpose of these frequencies helps maintain the integrity of amateur radio operations and promotes mutual respect among operators.

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