Ham Radio Extra Class Practice Test 2026 - Free Extra Class License Exam Questions and Study Guide

The reason the received signal from an amateur satellite may exhibit a rapidly repeating fading effect is due to the satellite's spinning. When a satellite spins, it can cause variations in the received signal strength as the orientation and position of the satellite change relative to the receiving station on Earth. This is especially true if the antenna system on the satellite is not omnidirectional or if the satellite has an active element, like antennas that direct signals. The change in angle and the direction of the signal can lead to constructive and destructive interference patterns, resulting in a fading effect that occurs rhythmically.

Ionospheric absorption does not typically cause rapid fading but rather a gradual attenuation of signals, and while a satellite's low orbital altitude can affect its signal strength and coverage area, it does not inherently lead to rapid fading patterns specific to its spin. The Doppler Effect relates to frequency shifts due to relative motion between the transmitter and receiver but does not directly cause fading in the signal's strength.