SEDSAT-2 Communications Design Notes 20080228

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Link Budget

Estimations based on the DJ C5T Alinco Transceiver and orbit as 800 km

  • Transmitting Power (PT):
    • TX output power = 300 mW
    • PT (dBm) = 24.77 dBm
  • Transmitting Antenna Gain (GT) (comparing two options)
    • Dipole
      • GT = 2.148 dB
      • EIRP = 26.918 dBm
    • Yagi-Uda
      • For 3 elements: GT = 6.97 dB ; EIRP = 31.74 dBm
      • For 5 elements: (higher gain, greater space and weight) GT = 9.19 dB ; EIRP = 30.96 dBm
  • Free Space Path Loss (Lp)
    • Lp (dB) = 142.97 dB
    • For orbit = 600 km: Lp (dB) = 140.47 dB
  • Fade Margin (Fm) – assuming average terrain, and a 90% reliability objective
    • Fm = 94.11 dB
    • For orbit = 600 km: Fm = 27.36 dB
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