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SLM-7650 Satellite Modem
Maintenance
(C+N)/N
C/N
3.0
0.0
3.5
0.9
4.0
1.8
4.5
2.6
5.0
3.3
5.5
4.1
6.0
4.7
6.5
5.4
7.0
6.0
7.5
6.6
8.0
7.3
8.5
7.8
9.0
8.4
9.5
9.0
10.0
9.5
10.5
10.1
11.0
10.6
11.5
11.2
12.0
11.7
12.5
12.2
13.0
12.8
13.5
13.3
14.0
13.8
14.5
14.3
15.0
14.9
15.5
15.4
16.0
15.9
16.5
16.4
17.0
16.9
17.5
17.4
18.0
17.9
18.5
18.4
19.0
18.9
19.5
19.5
20.0
20.0
Eb/No Adjustment (increase)
Table 5-8. Conversion to S/N and E b /N 0 Chart
BPSK
1/1
1/2
1/1
Eb/No
Eb/No
Eb/No
0.0
3.0
-3.0
0.9
3.9
-2.1
1.8
4.8
-1.2
2.6
5.6
-0.4
3.3
6.4
0.3
4.1
7.1
1.1
4.7
7.8
1.7
5.4
8.4
2.4
6.0
9.0
3.0
6.6
9.7
3.6
7.3
10.3
4.2
7.8
10.8
4.8
8.4
11.4
5.4
9.0
12.0
6.0
9.5
12.6
6.5
10.1
13.1
7.1
10.6
13.7
7.6
11.2
14.2
8.2
11.7
14.7
8.7
12.2
15.3
9.2
12.8
15.8
9.8
13.3
16.3
10.3
13.8
16.8
10.8
14.3
17.4
11.3
14.9
17.9
11.9
15.4
18.4
12.4
15.9
18.9
12.9
16.4
19.4
13.4
16.9
19.9
13.9
17.4
20.4
14.4
17.9
20.9
14.9
18.4
21.4
15.4
18.9
22.0
15.9
19.5
22.5
16.4
20.0
23.0
16.9
Table 5-9. Reed-Solomon Overhead Correction Factor
Reed-Solomon Overhead effect on Eb/No
R-S Code
225/205 219/201 204/188 126/112 194/178
Q/OQPSK
1/2
3/4
7/8
Eb/No
Eb/No Eb/No Eb/No Eb/No Eb/No Eb/No
0.0
-1.8
-2.5
0.9
-0.8
-1.5
1.8
0.0
-0.6
2.6
0.8
0.2
3.3
1.6
0.9
4.1
2.3
1.6
4.7
3.0
2.3
5.4
3.6
3.0
6.0
4.3
3.6
6.6
4.9
4.2
7.3
5.5
4.8
7.8
6.1
5.4
8.4
6.7
6.0
9.0
7.2
6.6
9.5
7.8
7.1
10.1
8.3
7.7
10.6
8.9
8.2
11.2
9.4
8.8
11.7
10.0
9.3
12.2
10.5
9.8
12.8
11.0
10.3
13.3
11.5
10.9
13.8
12.1
11.4
14.3
12.6
11.9
14.9
13.1
12.4
15.4
13.6
12.9
15.9
14.1
13.5
16.4
14.6
14.0
16.9
15.2
14.5
17.4
15.7
15.0
17.9
16.2
15.5
18.4
16.7
16.0
18.9
17.2
16.5
19.5
17.7
17.0
20.0
18.2
17.5
0.40
0.37
0.35
5–23
MN/SLM7650.IOM
8PSK
16QAM
2/3
5/6
3/4
-3.0
-4.0
-4.8
-2.1
-3.0
-3.8
-1.2
-2.2
-3.0
-0.4
-1.4
-2.2
0.3
-0.6
-1.4
1.1
0.1
-0.7
1.7
0.8
0.0
2.4
1.4
0.6
3.0
2.1
1.3
3.6
2.7
1.9
4.2
3.3
2.5
4.8
3.9
3.1
5.4
4.4
3.6
6.0
5.0
4.2
6.5
5.6
4.8
7.1
6.1
5.3
7.6
6.7
5.9
8.2
7.2
6.4
8.7
7.7
6.9
9.2
8.3
7.5
9.8
8.8
8.0
10.3
9.3
8.5
10.8
9.8
9.1
11.3
10.4
9.6
11.9
10.9
10.1
12.4
11.4
10.6
12.9
11.9
11.1
13.4
12.4
11.6
13.9
12.9
12.1
14.4
13.4
12.7
14.9
14.0
13.2
15.4
14.5
13.7
15.9
15.0
14.2
16.4
15.5
14.7
16.9
16.0
15.2
0.51
0.37
Revision 4
7/8
-5.5
-4.5
-3.6
-2.8
-2.1
-1.4
-0.7
0.0
0.6
1.2
1.8
2.4
3.0
3.5
4.1
4.7
5.2
5.7
6.3
6.8
7.3
7.9
8.4
8.9
9.4
9.9
10.4
11.0
11.5
12.0
12.5
13.0
13.5
14.0
14.5
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