Cisco Cisco 1 GHz GainStar Node Installation Guide
Balancing the Forward Path
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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.
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 Mini Node. The output level of the GainStar Mini Node 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 high test design frequency, and compare it with
the GainStar Mini Node. The output level of the GainStar Mini Node 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 high test 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
(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
(Main port output) /8 dB (Aux port output) to the measured levels to get the true
output levels.
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
(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
(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
output pad with a higher value pad.
If the output level is less than the design output level, replace the forward
output pad with a lower value pad, and proceed to step 5.
output pad with a lower value pad, and proceed to step 5.
4 Repeat steps 2 and 3 until the output level is correct. For optimum performance,
the output level in each port should not exceed 50 dBmV (single output) or 46.5
dBmV (dual outputs).
dBmV (dual outputs).
5 Proceed to To Set Up the Reverse Input Level.