Cisco Cisco 1 GHz GainStar Node Installation Guide
Balancing and Setup
32
Increasing the equalizer value reduces the level at lower frequencies, relative to
the level at 1 GHz.
Decreasing the equalizer value increases the level at lower frequencies, relative
to the level at 1 GHz.
Complete the following steps to select the proper forward input Equalizer value.
1 Compare the calculated input tilt in step 4 of To Determine the Output Tilt with
Complete the following steps to select the proper forward input Equalizer value.
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.
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.
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.
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.
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 total internal tilt for the station.
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
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
the design level (on the design print).
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.
outputs) to the measured levels to get the true output levels.
10 dB
GS Fwd
Cable EQ,
10 to 14 dB
1 GHz
Platform
Cable EQ,
10 to 14 dB
1 GHz
Platform
4034455
10 dB 1 GHz Plug-In Attenuator
4036031
11 dB
11 dB 1 GHz Plug-In Attenuator
4036032
12 dB
12 dB 1 GHz Plug-In Attenuator
4036033
13 dB
13 dB 1 GHz Plug-In Attenuator
4036034
14 dB
14 dB 1 GHz Plug-In Attenuator
4036035