Cisco GainMaker Optoelectronic Node 1GHz with 65 86 MHz Split Installation Guide
Chapter 3 Balancing and Setup
relative to the level at 870 MHz/1 GHz.
Decreasing the FWD I/S 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
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 interstage EQ
with a lower value.
If the output tilt is less than design tilt, replace the forward interstage EQ
with a higher value.
Important: While it is a 1 GHz equalizer, it is appropriate for use in both 1 GHz
and 870 MHz applications.
3 Measure the output tilt again, and then return to step 1.
To Set the Output Level
After setting the tilt, complete the following steps to select the proper FWD I/S pad
values for the amplifier. The output level of the amplifier is set by selecting the
proper FWD I/S pad value.
1 Connect the test probe to the forward main output test point.
2 Measure the output level at the highest design frequency, and compare this level
1 Connect the test probe to the forward main output test point.
2 Measure the output level at the highest design frequency, and compare this level
with the design level (on the design print).
3 Is the measured output level within ±0.5 dB of the design level?
If the output level is within ±0.5 dB of the design output level, proceed to
step 5.
If the output level is more than the design output level, replace the forward
interstage pad with a higher value pad.
If the output level is less than the design level, replace the forward interstage
pad with a lower value pad.
4 Repeat steps 2 and 3 until the output level is correct.
5 Proceed to
5 Proceed to
Balancing the Reverse Path (on page 51).
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