Cisco Cisco 1 GHz GainMaker Amplifier インストールガイド
Chapter 3 Balancing and Setup
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 Using Trim Networks
This section describes the procedure to follow when installing a trim network.
A trim network allows you to adjust amplifier frequency response to make it as uniform
as possible across the entire output spectrum. The trim network can be adjusted within
limits to cover a wide range of individual requirements. Type and use factor are
determined by evaluating actual system frequency response.
Refer to the frequency response plots in System Amplifier and Line Extender including
Refer to the frequency response plots in System Amplifier and Line Extender including
GainMaker® Products Trim Networks Installation Instructions, part number 741338.
To Install a Trim Network
Complete the following steps to install a trim network.
1
Open the node housing. Refer to To Open the Node Housing (on page 15).
2
Switch the AGC to THERMAL.
3
Record the RF output levels.
Note: The trim network location is labeled SYS TRIM on the module cover. Refer to
Note: The trim network location is labeled SYS TRIM on the module cover. Refer to
the following illustration.
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