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Substituting this information in equation (1) provides the following result:
10.0 dB + 27 dB – 15.0 dB – 8.0 dB = 14 dB
The slope of the required equalizer is 14 dB. Table 3-1 and Figure 3-1 show that 14 dB of slope
is caused by approximately 18 dB of cable at 870 MHz. Therefore the correct equalizer is model
SFE-87-18.
When selecting an equalizer, choose the next lower value if the exact value is not available or in
cases where the calculated value makes two choices possible.
Table 3-1 helps you choose the correct equalizers and also lists insertion loss at various
frequencies:
Table 3-1
Starline Forward Equalizers – SFE*-*
Equalizer
Equalizer
Value
Slope
SFE-75-
22
16.3
20
14.8
18
13.4
16
11.9
14
10.4
12
8.9
10
7.4
8
5.9
6
4.5
4
3.0
2
1.5
SFE-87-
22
16.7
20
15.2
18
13.7
16
12.1
14
10.6
12
9.1
10
7.6
8
6.1
6
4.6
4
3.0
2
1.5
Frequency (MHz) versus Insertion Loss (dB)
50
200
300
17.3
11.6
9.1
15.8
10.7
8.4
14.4
9.7
7.6
12.9
8.7
6.9
11.4
7.8
6.1
9.9
6.8
5.4
8.4
5.8
4.7
6.9
4.9
3.9
5.5
3.9
3.2
4.0
2.9
2.5
2.5
2.0
1.7
17.7
12.4
10.0
16.2
11.4
9.2
14.7
10.3
8.4
13.1
9.3
7.6
11.6
8.2
6.7
10.1
7.2
5.9
8.6
6.2
5.1
7.1
5.1
4.3
5.6
4.1
3.5
4.0
3.1
2.6
2.5
2.0
1.8
Amplifier Setup
450
550
650
6.0
4.2
2.5
5.5
3.9
2.4
5.1
3.6
2.2
4.6
3.3
2.1
4.2
3.0
2.0
3.7
2.7
1.8
3.3
2.4
1.7
2.8
2.1
1.6
2.4
1.9
1.4
1.9
1.6
1.3
1.5
1.3
1.1
7.1
5.4
3.9
6.5
5.0
3.6
6.0
4.6
3.4
5.4
4.2
3.1
4.9
3.8
2.8
4.3
3.4
2.6
3.8
3.0
2.3
3.2
2.6
2.0
2.7
2.2
1.8
2.1
1.8
1.5
1.6
1.4
1.3
BLE*/* Installation and Operation Manual
3-3
750
870
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
2.5
1.0
2.3
1.0
2.2
1.0
2.1
1.0
1.9
1.0
1.8
1.0
1.7
1.0
1.5
1.0
1.4
1.0
1.3
1.0
1.1
1.0
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