Cisco Cisco 1 GHz GainMaker Amplifier インストールガイド
Balancing the Forward Path
If the output tilt is less than design tilt, replace the forward input EQ with a
higher value.
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 pad values for the
amplifier. The output level of the amplifier is set by selecting the proper pad value.
Note: If you are setting the output level of an amplifier that has not warmed up for
Note: If you are setting the output level of an amplifier that has not warmed up for
approximately one hour, skip to the To Set the Output Level for a Cold Amplifier
procedure below.
To Set the Output Level for a Warm Amplifier
1
1
Connect the test probe to the forward 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
Balancing the Reverse Path (on page 74).
If the output level is more than the design output level, replace the forward input
pad with a higher value pad.
If the output level is less than the design output level, replace the forward input
pad with a lower value pad.
To Set the Output Level for a Cold Amplifier
After setting the tilt, complete the following steps to select the proper pad values for the
amplifier. The output level of the amplifier is set by selecting the proper pad value.
Note: Using this procedure will result in a more accurate output level setting when
Note: Using this procedure will result in a more accurate output level setting when
balancing an amplifier using amplifier and coax compensation mode if the amplifier has
had little or no warm-up period.
Important! For the most accurate output level setting, allow the amplifier to warm up for
approximately one hour and use the To Set the Output Level for a Warm Amplifier
procedure above.
1
Connect the test probe to the forward 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), minus 1 dB.
The station output level must be 1 dB lower than the output level specified by the
The station output level must be 1 dB lower than the output level specified by the
design print. This reduction in output level will be offset by an increase in internal
amplifier gain as the thermal circuit in the amplifier warms up.
3
Is the measured output level within ±0.5 dB of the design level minus 1 dB?
If the output level is within ±0.5 dB of the design output level minus 1 dB,
proceed to step 5.
If the output level is more than the design output level minus 1 dB, replace the
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