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T8B04

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

T8B04T8B →

What mode of transmission is commonly used by amateur radio satellites?

  1. ASSB
  2. BFM
  3. CCW/data
  4. DAll these choices are correct
Why Amateur satellites carry a mix of payload types, so all three modes show up. Linear transponders on satellites relay SSB (and CW) because those narrow, low-duty-cycle modes let many users share the transponder's limited power. Other satellites act as single-channel FM repeaters, and nearly every satellite sends CW or digital telemetry beacons, while some carry packet/APRS digipeaters.
Watch out Picking only FM is tempting because the easy-to-work FM 'easysats' get the most beginner attention, but that ignores the linear transponder satellites and the telemetry beacons.
Satellites do it all: SSB and CW through linear transponders, FM repeaters, data beacons. Answer is 'all of these.'
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
← T8B03 All of T8B T8B05 →

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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