Decibel is a unit that indicates the power of coverage and signal transmission power of the satellite transmitter. The higher this value, the smaller the size (diameter) of the receiver antenna. For example, a satellite with a power of 64 dBW with a dish at least 22 cm in diameter. It will be receivable or a satellite with a power of 38 dWB will need an antenna with a diameter of at least 150 meters.
If you pay attention to the specifications on the LNB, there is an expression as N.F.:0.6dB that the lower this value is, the more power the LNB has to receive signals. In most new LNBs this value is equal to 0.6dB
LNB / dB
EIRP
0.6 - 0.7
0.8 - 1.0
1.1 - 1.3
64 dBW
22 cm
23 cm
25 cm
63 dBW
24 cm
26 cm
28 cm
62 dBW
26 cm
28 cm
30 cm
61 dBW
28 cm
30 cm
32 cm
60 dBW
30 cm
32 cm
34 cm
59 dBW
32 cm
34 cm
36 cm
58 dBW
34 cm
36 cm
38 cm
57 dBW
36 cm
38 cm
41 cm
56 dBW
38 cm
40 cm
44 cm
55 dBW
40 cm
45 cm
50 cm
54 dBW
45 cm
50 cm
55 cm
53 dBW
50 cm
50 cm
55 cm
52 dBW
50 cm
55 cm
55 cm
51 dBW
55 cm
60 cm
60 cm
50 dBW
60 cm
60 cm
65 cm
49 dBW
60 cm
60 cm
65 cm
48 dBW
60 cm
75 cm
75 cm
47 dBW
75 cm
90 cm
90 cm
46 dBW
80 cm
90 cm
100 cm
45 dBW
90 cm
100 cm
105 cm
44 dBW
90 cm
100 cm
120 cm
43 dBW
100 cm
110 cm
120 cm
42 dBW
110 cm
120 cm
135 cm
41 dBW
120 cm
120 cm
150 cm
40 dBW
120 cm
135 cm
150 cm
39 dBW
135 cm
150 cm
180 cm
38 dBW
150 cm
180 cm
240 cm
37 dBW
180 cm
240 cm
300 cm
36 dBW
240 cm
300 cm
360 cm
35 dBW
300 cm
360 cm
480 cm
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