Cisco Cisco 1 GHz GainMaker Amplifier インストールガイド
Balancing the Forward Path
67
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.
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
GainMaker® Products Trim Networks Installation Instructions, part number 741338.
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 amplifier housing. Refer to To Open the Amplifier Housing (on page
1 Open the amplifier housing. Refer to To Open the Amplifier Housing (on page
2 Switch the AGC to THERMAL.
3 Record the RF output levels.
3 Record the RF output levels.
Note: The trim network location is labeled SYS TRIM on the module cover. Refer
to the following illustration.
to the following illustration.
4 Remove the jumper from the system trim location.
5 Install the trim network into the system trim slot.
5 Install the trim network into the system trim slot.
Note:
Be sure that all pins on the system trim bottom align with the pin holes in the
system trim slot, so the system trim installs flat against the amplifier module.
system trim slot, so the system trim installs flat against the amplifier module.
Make sure the components face the outside of the station. See the preceding
diagram for proper positioning.
diagram for proper positioning.
6 After tuning the trim network for proper response, measure the RF output level.
7 Change the interstage pad or input pad to obtain the same RF output level as
7 Change the interstage pad or input pad to obtain the same RF output level as
noted in step 3.
8 Switch the AGC module to AUTO.
9 Reset the AGC for proper output levels.
10 Close the amplifier housing. Refer to To Close the Amplifier Housing (on page
9 Reset the AGC for proper output levels.
10 Close the amplifier housing. Refer to To Close the Amplifier Housing (on page