Link Budget for satellite data broadcasting / distribution.

The information comprises 128kbit/s data. 1/2 rate Viterbi FEC is used.
To be sent to 0.9m diameter antennas. Bandwidth is 250 kHz,

Transponder parameters EIRP=50 dBW, G/T=+5 dBK, PFDsat = -80 dBW/m^2 ( say Eutelsat W2 )
Assume multi-carrier operating point 7 dB input and 4.5 dB output back off.

Uplink Satellite PFDsat = -80 dBW/m^2
Operating transponder PFD = -80 - 7 = -87 dBW/m^2
Operating PFD for this carrier = -87 -10log(250000 / 36000000) = -87 -21.6 = -108.6 dBW/m^2

Downlink eirp = 50 - 4.5 - 10 log (250000 / 36000000) = 50 - 21.6 = 23.9 dBW

Amend white boxes as you wish. and click to any calculate button to obtain results in the green boxes.

Uplink frequency GHz
Uplink antenna diameter m
Uplink antenna aperture efficiency e.g. 0.65
Uplink antenna transmit gain dBi
Uplink antenna, power at the feed W
Uplink EIRP dBW
Range (35778 - 41679) km
Uplink path loss dB
Uplink pfd at satellite dBW/m^2
Bandwidth Hz
Satellite uplink G/T dB/K
Uplink C/N dB

Downlink frequency GHz
Downlink receive antenna diameter m
Downlink receive antenna aperture efficiency e.g. 0.65
Downlink system noise temperature(antenna+LNA) K
Downlink receive antenna gain dBi
Downlink receive antenna G/T dB/K
Downlink satellite EIRP dBW
Downlink path loss dB
Downlink C/N dB

Uplink C/interference dB
Uplink C/N dB
Satellite C/intermod dB
Downlink C/N dB
Downlink C/interference dB
Total link C/N dB

Pre-calculated link budget with useful default parameters inserted (may be amended and recalculated)

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Any problems or comments please e-mail eric@satsig.net