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T8B03

SIGNALS AND EMISSIONS · Amateur satellite operation: Doppler shift, basic orbits, operating protocols, modulation mode selection, transmitter power considerations, telemetry, satellite tracking programs, beacons, uplink and downlink mode definitions, spin fading, definition of "LEO", setting uplink power

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Which of the following are provided by satellite tracking programs?

  1. AMaps showing the real-time position of the satellite track over Earth
  2. BThe time, azimuth, and elevation of the start, maximum altitude, and end of a pass
  3. CThe apparent frequency of the satellite transmission, including effects of Doppler shift
  4. DAll these choices are correct
Why Satellite tracking software takes the satellite's orbital elements (Keplerian elements or TLEs) plus your grid location and the current time, and from that it can compute everything about the pass. That includes a ground track map showing where the satellite is over Earth right now, the AOS (acquisition of signal) and LOS times with azimuth and elevation for pointing your antenna, and the Doppler-shifted apparent frequency so you know where to tune. Because all three items follow from the same orbital math, all of the listed choices are correct.
Watch out Each individual choice is a true statement, so picking just one leaves out functions the software also provides. When several choices are all genuinely true, the combined answer is the right one.
Tracking software knows where, when, and at what frequency: map, pass times, and Doppler all come from the same orbital data.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
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The rest of T8B

  1. T8B01 What telemetry information is typically transmitted by satellite beacons?
  2. T8B02 What is the impact of using excessive effective radiated power on a satellite uplink?
  3. T8B03 Which of the following are provided by satellite tracking programs?
  4. T8B04 What mode of transmission is commonly used by amateur radio satellites?
  5. T8B05 What is a satellite beacon?
  6. T8B06 Which of the following are inputs to a satellite tracking program?
  7. T8B07 What is Doppler shift in reference to satellite communications?
  8. T8B08 What does it mean if a satellite is operating in U/V mode?
  9. T8B09 What causes spin fading of satellite signals?
  10. T8B10 What does the term LEO mean in reference to communication satellites?
  11. T8B11 Who is permitted to receive telemetry from an amateur radio satellite?
  12. T8B12 Which of the following is a way to determine whether your satellite uplink power into a linear transponder sa…
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