Cisco GainMaker Optoelectronic Node 1GHz with 55 70 MHz Split Installationsanleitung
Forward Path Balancing for Thermal Stations Using Amplifier Only Compensation Mode
2 Consult the design print to find the proper output tilt.
3 Measure the output signal levels at the frequencies you used in
3 Measure the output signal levels at the frequencies you used in
To Verify the
Input Signal Level (on page 51).
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 increments. A 1.5 dB change in value
changes the difference between low and high frequencies by approximately 1 dB.
Increasing the equalizer value reduces the level at lower frequencies, relative to
the level at 870 MHz/1 GHz.
Decreasing the 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 input EQ with a
lower value.
If the output tilt is less than design tilt, replace the forward input EQ with a
higher value.
Important: The forward input equalizer is installed at the factory and should not
be changed in the field. While it is a 1 GHz equalizer, it is appropriate for use in
both 1 GHz and 870 MHz applications.
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