Cisco Cisco 1 GHz GainMaker Amplifier Guía De Instalación
Chapter 3 Balancing and Setup
To Determine the Output Tilt
Complete the following steps to determine the output tilt of the amplifier.
1 Connect the test point adapter to the forward main output test point.
Complete the following steps to determine the output tilt of the amplifier.
1 Connect the test point adapter to the forward main output test point.
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 49).
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 (equivalent) increments. A 1.5 dB change in
Equalizers (EQs) are available in 1.5 dB (equivalent) 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.
54
OL-31156-01