Motorola BLE*/* - Manual (Page 24)

Amplifier Setup 3-3
BLE*/* Installation and Operation Manual
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*-*
Frequency (MHz) versus Insertion Loss (dB)
Equalizer
Value Equalizer
Slope
50 200 300 450 550 650 750 870
SFE-75-
22 16.3 17.3 11.6 9.1 6.0 4.2 2.5 1.0
20 14.8 15.8 10.7 8.4 5.5 3.9 2.4 1.0
18 13.4 14.4 9.7 7.6 5.1 3.6 2.2 1.0
16 11.9 12.9 8.7 6.9 4.6 3.3 2.1 1.0
14 10.4 11.4 7.8 6.1 4.2 3.0 2.0 1.0
12 8.9 9.9 6.8 5.4 3.7 2.7 1.8 1.0
10 7.4 8.4 5.8 4.7 3.3 2.4 1.7 1.0
8 5.9 6.9 4.9 3.9 2.8 2.1 1.6 1.0
6 4.5 5.5 3.9 3.2 2.4 1.9 1.4 1.0
4 3.0 4.0 2.9 2.5 1.9 1.6 1.3 1.0
2 1.5 2.5 2.0 1.7 1.5 1.3 1.1 1.0
SFE-87-
22 16.7 17.7 12.4 10.0 7.1 5.4 3.9 2.5 1.0
20 15.2 16.2 11.4 9.2 6.5 5.0 3.6 2.3 1.0
18 13.7 14.7 10.3 8.4 6.0 4.6 3.4 2.2 1.0
16 12.1 13.1 9.3 7.6 5.4 4.2 3.1 2.1 1.0
14 10.6 11.6 8.2 6.7 4.9 3.8 2.8 1.9 1.0
12 9.1 10.1 7.2 5.9 4.3 3.4 2.6 1.8 1.0
10 7.6 8.6 6.2 5.1 3.8 3.0 2.3 1.7 1.0
8 6.1 7.1 5.1 4.3 3.2 2.6 2.0 1.5 1.0
6 4.6 5.6 4.1 3.5 2.7 2.2 1.8 1.4 1.0
4 3.0 4.0 3.1 2.6 2.1 1.8 1.5 1.3 1.0
2 1.5 2.5 2.0 1.8 1.6 1.4 1.3 1.1 1.0