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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.
To determine the proper cable for bench testing, subtract the interstage equalizer value (14 dB)
from the cable connected to its input. The output is flat with a flat signal source.
Because of errors in cable attenuation, slope in passive devices, and other independent
variables, you may need to change the final value of the equalizer before you install the BT100.
STARLINE Cable Simulators
STARLINE cable simulators, model SCS-*, are used in place of fixed equalizers in systems
where: (1) the amplifiers are located close together, (2) there are large amounts of flat loss from
passive components, or (3) it is necessary to compensate for reverse cable tilt. The simulators fit
in the same location as the equalizers.
Table 3-2 and Figure 3-2 help you choose the correct simulators:
Table 3-2
Starline cable simulators
SCS-*
Frequency
40 MHz
45 MHz
50 MHz
72 MHz
108 MHz
150 MHz
211 MHz
250 MHz
300 MHz
350 MHz
400 MHz
450 MHz
550 MHz
750 MHz
870 MHz
1003 MHz
50 MHz loss (typical)
1
2
3
4
0.0
0.1
0.1
0.1
0.0
0.0
0.1
0.1
0.0
0.0
0.0
0.0
-0.1
-0.2
-0.2
-0.3
-0.1
-0.3
-0.4
-0.5
-0.2
-0.5
-0.7
-0.9
-0.3
-0.7
-1.0
-1.4
-0.4
-0.8
-1.2
-1.7
-0.5
-1.0
-1.5
-1.9
-0.6
-1.1
-1.7
-2.2
-0.6
-1.2
-1.8
-2.5
-0.7
-1.4
-2.0
-2.7
-0.8
-1.6
-2.4
-3.2
-1.0
-2.0
-3.0
-4.0
-1.1
-2.2
-3.3
-4.4
-1.2
-2.5
-3.7
-4.9
-1.0
-1.0
-1.0
-1.0
Amplifier Setup
5
6
7
8
Cable slope in dB
0.2
0.2
0.3
0.3
0.1
0.1
0.1
0.1
0.0
0.0
0.0
0.0
-0.4
-0.4
-0.5
-0.6
-0.6
-0.8
-0.9
-1.0
-1.2
-1.4
-1.6
-1.9
-1.7
-2.1
-2.4
-2.8
-2.1
-2.5
-2.9
-3.3
-2.4
-2.9
-3.4
-3.9
-2.8
-3.3
-3.9
-4.4
-3.1
-3.7
-4.3
-4.9
-3.4
-4.1
-4.7
-5.4
-4.0
-4.8
-5.5
-6.3
-5.0
-6.0
-7.0
-8.0
-5.5
-6.7
-7.8
-8.9
-6.2
-7.4
-8.7
-9.9
-1.0
-1.0
-1.0
-1.0
BT100 Installation and Operation Manual
3-5
9
10
0.3
0.4
0.2
0.2
0.0
0.0
-0.7
-0.7
-1.2
-1.3
-2.1
-2.3
-3.1
-3.5
-3.7
-4.1
-4.4
-4.9
-5.0
-5.5
-5.5
-6.2
-6.1
-6.8
-7.1
-7.9
-9.0
-10.0
-10.0
-11.1
-11.1
-12.4
-1.0
-1.0
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