Amateur radio satellite tracking, Doppler shift, and space communication basics including contacting the International Space Station.
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- What are the three main orbital altitude classifications for amateur radio satellites?
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Low Earth Orbit (LEO), Medium Earth Orbit (MEO), and Geostationary Orbit (GEO).- Define Doppler shift in the context of satellite communications.
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The change in received frequency due to relative motion between the satellite and Earth station, higher as satellite approaches, lower as it recedes.- What is the approximate orbital period of the International Space Station?
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Approximately 90 minutes (one orbit every 90 minutes).- What is an uplink frequency in satellite operation?
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The frequency transmitted from the Earth station to the satellite.- What is a downlink frequency in satellite operation?
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The frequency transmitted from the satellite back to the Earth station.- What is a transponder in an amateur radio satellite?
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An on-board receiver and transmitter that relays signals from one uplink frequency to a different downlink frequency.- What does AMSAT stand for?
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Radio Amateur Satellite Corporation.- What frequency bands are commonly used for amateur radio satellite communication?
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2 meters (VHF) and 70 centimeters (UHF) are most common for LEO satellites.- What does a beacon signal from a satellite transmit?
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Telemetry data and status information, allowing operators to monitor the satellite's health and receive signals even without an active transponder.- What is a pass in satellite terminology?
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A single opportunity for an Earth station to communicate with a satellite as it rises above and falls below the horizon.- What software is commonly used to predict satellite passes?
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Programs like Gpredict, N2YO, or HeavensAbove calculate pass timing and elevation angles.- How often should TLE data be updated for accurate pass predictions?
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TLE data should be updated regularly, ideally multiple times per week, as orbital decay and station-keeping maneuvers change satellite positions.- What antenna type is typically used for amateur radio satellite reception?
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Yagi antennas or crossed-Yagi arrays, which provide directional gain toward the satellite.- What does Azimuth refer to when tracking a satellite?
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The compass direction (0 to 360 degrees) from your location to the satellite, measured clockwise from north.- What does Elevation refer to when tracking a satellite?
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The angle above the horizon to the satellite, ranging from 0 degrees (at horizon) to 90 degrees (directly overhead).
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