VSAT index>

Link budgets index

Outlink VSAT link-budget from Europe to Africa

LinkStar Turin Eutelsat W3A Africa broadband satellite internet service

Explanation of satellite links

Link budget for VSAT Remotes (return-link) to Hub direction

Link budget for Hub to VSAT Remotes (out-link) direction of transmission

Return link from Africa to Europe, Eutelsat W3A:
Satellite Link Budget Calculator page

The return links from Africa VSATs to Turin are expected to comprise mostly 156 ksps burst carriers with 180 kHz noise bandwidth and 200 kHz spacing.  Based on a satellite saturated EIRP to Europe of 48 dBW and -5 dB output back off the downlink power per carrier is approx 48 - 5 -10log(200k/36000k) = 20.5 dBW.

The LinkStar transmit module (BUC) is 2 watt standard.

The input figures below are all guesses and 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
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

Any problems or comments please e-mail Eric Johnston

Copyright (c) 1 Jan 1999 Satellite Signals Ltd All Rights Reserved
Last Revision: 29 April 2022