How to calculate what size dish
How to calculate
what size dish you need for your location
You can use this chart to help find out what size dish
you will need by looking at the footprint
of the satellite
your trying to
receive. Just look at the footprint
image for the satellite
your wanting and
find where you are on the map. Then take the EIRP
value for that area and look
for it on the chart and see what the recommended dish size is.
For example, I live in Tampa Florida and I would like to
view KU channels on Telstar 5, By looking at the footprint
map I can see the
EIRP
value for my area is 48 which means I should have at least a 65 cm dish (25
inch dish). Since I have a 75cm dish (31 dish) I'm good to go.
For most of the continental US you can use a
75cm dish. Fringe areas may need a 90cm or larger dish depending on which
satellite
your trying to obtain signal from. You can use this chart to double
check to see if a 75cm dish will be large enough.
|
EIRP
- Abbreviation for
Effective-Isotropic-Radiated-Power
C Band
- the frequencies in
the 4 to 6 GHz range used both for terrestrial microwave
links and
satellite
links
Ku Band
-
the frequency
range from 10.5 to 17
GHz; in satellite
communications, the frequency
band 13.75 to 14.50
GHz for transmission, and 10.7 to 12.75 GHz for reception
|
|
C-Band |
Ku-Band |
EIRP
(dBW
) |
C Band
Dish
Size
(meters) |
C Band
Dish
Size
(Feet) |
EIRP
(dBW
) |
KU Dish Size
(centimeter) |
KU Dish Size
(inches) |
| 39.0 |
1.9 |
6.2 |
50.0 |
55 |
21.65 |
| 38.0 |
2.1 |
6.8 |
49.0 |
60 |
23.62 |
| 37.0 |
2.3 |
7.5 |
48.0 |
65 |
25.59 |
| 36.0 |
2.6 |
8.5 |
47.0 |
72 |
28.35 |
| 35.0 |
2.8 |
9.1 |
46.0 |
77 |
30.31 |
| 34.0 |
3.1 |
10.1 |
44.0 |
95 |
37.40 |
| 33.0 |
3.5 |
11.4 |
42.0 |
115 |
45.28 |
| 32.0 |
3.9 |
12.8 |
40.0 |
138 |
54.33 |
| 31.0 |
4.3 |
14.1 |
38.0 |
175 |
68.90 |
|
Click on images for larger version
|
Telstar 5 KU Band
|
Telstar 6 KU Band
|
AMC 5 KU Band
|
Telstar 11 KU
Band |
|
AMC 3 KU Band
|
AMC 2 KU Band
|
Satmex 5 KU Band
|
AMC4 KU Band
|
More Satellite
foot prints can be found at the
SatCodX website
If you live in an area that has restrictions on
antenna
and dish sizes and placement you may want to know that the FCC has
passed rules to allow you to use up to a 39.37 inch dish (1 meter or 100
centimeters). The FCC rules may over ride any local regulations imposed on you.
Check here for more information
FCC Information
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