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Link budget for teleport hub from Europe to VSATs in Africa

The outlink is typically a full transponder, so as to get the maximum transponder capacity, which is achieved in single carrier mode. A 30 MHz wide carrier in a 36 MHz bandwidth transponder is assumed as the default below.

The input figures below are all estimates. You may overwrite the figures with your own assumptions.

Amend any white boxes and then click 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	dBi
Uplink antenna, power at the feed W
Uplink EIRP dBW	dBW
Range (35778 - 41679) km
Uplink path loss dB	dB
Uplink pfd at satellite dBW/m^2	dBW/m^2
Bandwidth Hz
Satellite uplink G/T dB/K
Uplink C/N dB	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	dBi
Downlink receive antenna G/T dB/K	dB/K
Downlink satellite EIRP dBW
Downlink path loss dB	dB
Downlink C/N dB	dB

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

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

Last Revision: 29 April 2022, 28 July 2024