Satellite Secret's (EIRP in dB) Dish Size Formula

[sharza]

When you are looking at satellite footprints, you will often find ones which give a power reading in dB rather than a dish size required.
Does anyone know the exact formula for the relationship between EIRP (dbW), dish size (m) and LNB noise figure (d, assuming clear weather conditions.

 

[Analoguesat]

This page should give you a reasonable idea.

http://www.flysat.com/dish.php

 

[Orthoclipse]

Following on from that, does anyone have a list of 'EIRP vs Dish Gain' figures?

The reason I ask is that different dishes of the same size can have different gain numbers and it's never clear from the 'EIRP vs Dish size' tables what the gain of the dish is supposed to be.

 

[ravimdxb]

Follow this link:
http://www.apsattv.com/techinfo/predicting-out-of-footprint-coverage.htm

Enjoy!

 

[Orthoclipse]

Dish gain @ 11GHz with 60% efficiency

47 dBW 75 cm (36.5 d
46 dBW 80 cm (37.1 d
45 dBW 90 cm (38.1 d
44 dBW 90 cm (38.1 d
43 dBW 100 cm (39.0 d
42 dBW 110 cm (39.8 d
41 dBW 120 cm (40.6 d
40 dBW 120 cm (40.6 d
39 dBW 135 cm (41.6 d
38 dBW 150 cm (42.5 d
37 dBW 180 cm (44.1 d
36 dBW 240 cm (46.6 d
35 dBW 300 cm (48.6 d
34 dBW 355 cm (50.0 d
33 dBW 400 cm (51.0 d
32 dBW 450 cm (52.1 d

 

[izefisherman]

The FEC of the transmitted signal is also a major factor here. The difference for error free reception between 2/3 and 7/8 FEC is in the order of 2dB. That is quite much when translated into dish size.

 

[member91040]

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h**p://w**.tutorialsweb.com/satcom/link-power-budget/link-power-budget-index.htm