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2-10
Overview
Level Control
The gain of hybrid IC amplifiers varies with temperature. The integrated thermal control circuit
senses temperature and works to offset the gain variation in the hybrid IC amplifier by
signaling needed changes to the RF PIN attenuator.
In addition, changes in system channel loading and/or splices in the fiber link can change the
level of the received signal.
Tilt Selection
To use the tilt selection charts, first determine the system operating bandwidth, either 750 MHz
or 870 MHz. Next, determine the preferred system channel load. Use the corresponding
bandwidth and channel loading chart (Figure 2-7 or 2-8) to determine the preferred tilt.
Figure 2-7 illustrates the relative level dB chart for 750 MHz bandwidth:
Figure 2-7
Relative level dB versus 750 MHz
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
-1
-2
-3
50
150
SG1000 Split Third Port Installation and Operation Manual
SG1000 750 MHz Slope Chart
250
350
450
Frequency, MHz
Digital loading is 6 dB below analog levels
550
650
750
14 dB
12.5 dB
10 dB
8 dB
6 dB
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