Cisco GainMaker Optoelectronic Node 1GHz with 65 86 MHz Split Installation Guide

Forward Path Balancing for AGC Stations Using Manual Setup Mode

To Set Up Automatic Gain Control

This section provides procedures and tables for configuring and aligning the AGC in

the GainMaker node. AGC attenuator values are required to select the proper AGC

attenuator value based upon actual AGC pilot carrier output level. See To Select the

AGC Pad Value.
Note:



Output levels are measured at the pilot frequency.



The standard single-pilot AGC makes amplifier output adjustments based on the

level of the pilot frequency carrier. Activate the pilot carrier with its final

unscrambled video source before beginning balance and alignment.

The following diagram shows the location of the AGC related switch, controls, and

AGC pad.

To Select the AGC Pad Value

1 Use the following formula to determine the correct AGC pad value for the High

Gain Dual and Balanced Triple.



AGC pad value = RF output level at pilot frequency (main output port) - 34

2 After finding the correct AGC pad value, install it in the amplifier in the AGC

pad slot. The preceding AGC setup illustration also shows the location of the

AGC pad.

3 Proceed to To Align the AGC Module.

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