Cisco Cisco 1 GHz GainMaker Amplifier Guía De Instalación
Balancing the Forward Path
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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
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.
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/1.2 GHz.
the level at 870 MHz/1 GHz/1.2 GHz.
Decreasing the equalizer value increases the level at lower frequencies, relative
to the level at 870 MHz/1 GHz/1.2 GHz.
to the level at 870 MHz/1 GHz/1.2 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
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.
section, To Set the Output Level.