Comtech EF Data SLM-5650A Installation And Operation Manual page 54

Asymmetrical Adjacent Carriers
Operating in the presence of two adjacent asymmetrical carriers, one lower in frequency and one
higher in frequency, and each adjacent carrier symbol rate (R"
performance is not degraded more than indicated in Table 2-17 Column 4, and a) and b) in this
section. Performance is measured with the adjacent carriers center frequencies offset (X/2) times
(R' + R" ) Hz from the test carrier center frequency, where X is the spacing factor and R'
s s
modulation symbol rate in Hz of the test carrier, and R"
each adjacent carrier. For modulation symbol rates below 38.4 ksps, this paragraph does not
apply.
For X (spacing factor) = 1.2, and R"
the values in Table 2-17 Column 4, and the corresponding test carrier E
test carrier E /N
s
configuration. The adjacent carriers E
For the case of (1.4/2)(R'
Table 2-17. Acceptable ACI Degradation with Spacing Factor of 1.2
Test Carrier
E /N (dB)
s 0
5.5
6.0
8.0
8.4
10.0
12.0
12.7
Specifications
= 2.0 R'
s
that will yield timely results based on modulation and coding used in the test
0
/N
s
+ R" ) Hz carrier spacing, the degradation is < 0.2 dB.
s s
Adjacent Carriers
E /N (dB)
s 0
18.5
19.0
21.0
21.4
23.0
25.0
25.7
) = 2.0 R'
s
is the modulation symbol rate in Hz of
s
, the asymmetric degradation shall be IAW one of
s
are set to the corresponding value in Column 2.
0
E /N Degradation (dB)
b 0
Symmetric Case
< 0.36
< 0.38
< 0.48
< 0.51
< 0.64
< 0.88
< 0.99
2–10
SLM-5650A Satellite Modem
Revision 10
, the modem
s
is the
s
/N in Column 1. Select a
s 0
E /N Degradation (dB)
b 0
Asymmetric Case
< 0.41
< 0.43
< 0.56
< 0.60
< 0.77
< 1.10
< 1.21
MN-SLM-5650A