Cisco Cisco 1 GHz GainStar Amplifier Installation Guide
Balancing the Forward Path
1 Compare the calculated input 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 Up the Forward Output Level.
If the output tilt is more than the design tilt, replace the forward input EQ
with a lower value EQ.
If the output tilt is less than the design tilt, replace the forward input EQ with
a higher value EQ.
3 Measure the output tilt again, and then return to step 1.
Note:
The forward output equalizer is installed at the factory, and should not be
changed in the field.
The plug-in output equalizer and an on-board equalizer combine to generate
the total internal tilt for the station. The plug-in output equalizer value is
different from the 1 GHz, or 862 MHz platform, in order to achieve optimum
performance.
To Set Up the Forward Output Level
After setting the tilt, complete the following steps to select the proper pad values for
the GainStar Line Extender. The output level of the GainStar Line Extender is set by
selecting the proper pad value.
1 Connect the test probe to the forward output test point.
2 Measure the output level at the highest design frequency, and compare it with
1 Connect the test probe to the forward output test point.
2 Measure the output level at the highest design frequency, and compare it with
the design level (on the design print).
862 MHz for 862 MHz version
1000 MHz for 1000 MHz version
If the Signal Director is installed, add 20 dB (single output) or 16.5 dB (dual
outputs) to the measured levels to get the true output levels.
If the DC8 Directional Coupler is installed, add 20 dB (single output) or 18.0 dB
If the DC8 Directional Coupler is installed, add 20 dB (single output) or 18.0 dB
(Main port output) /12.2 dB (Aux port output) to the measured levels to get the
true output levels.
If the DC12 Directional Coupler is installed, add 20 dB (single output) or 18.5 dB
If the DC12 Directional Coupler is installed, add 20 dB (single output) or 18.5 dB
(Main port output) /8 dB (Aux port output) to the measured levels to get the true
output levels.
3 Are the output levels within +/-0.5 dB of the design level?
If yes, proceed to step 5.
If the output level is more than the design output level, replace the forward
input pad with a higher value pad.
If the output level is less than the design output level, replace the forward
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