Cisco Cisco 1 GHz GainMaker Amplifier 설치 가이드
Chapter 3 Balancing and Setup
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.
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 input
pad with a higher value pad.
If the output level is less than the design level, replace the forward input pad
with a lower value pad.
4
Repeat steps 2 and 3 until the output level is correct.
Note: On the High Gain Dual, the type of plug-in signal director installed directly
Note: On the High Gain Dual, the type of plug-in signal director installed directly
affects the signal level measured at the Aux RF output test points. This is because the
Aux RF output test points are located after the signal director in the forward RF
signal path instead of before as in previous versions of system amplifiers (II, II+, and
III). The test points now reflect the actual output of the port.
It is important to determine if the Aux output level specified on the design print is
It is important to determine if the Aux output level specified on the design print is
the level before or after the signal director.
If it is the level after the signal director (port output level), the test point should
match the print design level.
If it is the level before the signal director, the test point level should be “x” dB
lower than the print design level, where “x” is the insertion loss of the signal
director feeding the particular Aux port being balanced.
5
Proceed to Balancing the Reverse Path (on page 74).
Forward Path Balancing for Thermal Stations Using Amplifier and Coax
Compensation Mode
Before you begin, make sure that you have configured the amplifier module according to
the specifications in the design print, and that the amplifier has warmed up for
approximately one hour.
Note: If it is necessary to balance a thermal station using amplifier and coax
compensation mode immediately after module installation (with little or no warm-up
period), the output level should be set 1 dB lower than 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.
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