Cisco Cisco 1 GHz GainMaker Amplifier 安装指南
Chapter 3 Balancing and Setup
2
Consult the design print to find the proper output tilt.
3
Measure the output signal levels at the frequencies you used in To Verify the Input
Signal Level (on page 45).
4
To determine the actual output tilt, calculate the difference (in dB) between the levels
of the lowest and highest specified frequencies.
5
Proceed to the next section, To Set the Output Tilt.
To Set the Output Tilt
Equalizers (EQs) are available in 1.5 dB (equivalent) increments. A 1.5 dB change in
value changes the difference between low and high frequencies by approximately 1 dB
generally, or 1.2 dB for AGC stations in manual setup mode.
Increasing the equalizer value reduces the level at lower frequencies, relative to
the level at 870 MHz/1 GHz.
Decreasing the equalizer value increases the level at lower frequencies, relative to
the level at 870 MHz/1 GHz.
Complete the following steps to select the proper forward input equalizer value.
1
Compare the calculated output tilt in step 4 of To Determine the Output Tilt with
the design tilt (on the design print).
2
Is the output tilt within ±0.5 dB of the design tilt?
If the output tilt is within ±0.5 dB of the design tilt, proceed to the next section,
To Set the Output Level.
If the output tilt is more than design tilt, replace the forward input EQ with a
lower value.
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