Cisco Cisco 1 GHz GainMaker Amplifier インストールガイド
Chapter 3 Balancing and Setup
42
Preparing for Forward Path Balancing
Before you begin balancing, it is important to review and understand the following
information. This information will show you which balancing process is appropriate
for your amplifier.
information. This information will show you which balancing process is appropriate
for your amplifier.
Before balancing, make sure that you have configured the amplifier according to the
specifications in your design print and that the amplifier has warmed up for
approximately one hour.
specifications in your design print and that the amplifier has warmed up for
approximately one hour.
The table below shows the items needed for balancing.
You need a ...
To ...
copy of the design print
determine expected input and output signal
levels.
levels.
torque wrench with 1/2-inch socket
open and close the system amplifier housing.
spectrum analyzer or signal analysis
meter capable of working with
frequencies up to the highest design
frequency
meter capable of working with
frequencies up to the highest design
frequency
determine absolute and relative signal levels.
test point adapter (part number 562580)
or F-81 female-to-female adapter
or F-81 female-to-female adapter
access the test points.
length of 75 ohm coaxial cable with
F-connectors on each end
F-connectors on each end
connect the test point adapter to the test
equipment.
equipment.
voltmeter
test the power supply AC and DC voltages.
reverse sweep receiver
test signals using a reverse sweep transmitter.
1/8-inch flat blade screwdriver
adjust switch S1, AGC Manual Backoff, and
AGC Gain Control
AGC Gain Control
Understanding Switch S1 Functions
Switch S1 is a multifunction, three-position switch. Switch S1 functions are
determined by whether or not an AGC is installed in the station.
determined by whether or not an AGC is installed in the station.
When an AGC is installed in the station, it is an AGC station. In an AGC station,
switch S1 provides two setup modes and one operational mode.
switch S1 provides two setup modes and one operational mode.
When there is no AGC installed in the station, it is a thermal station. In a thermal
station, switch S1 provides two operational modes.
station, switch S1 provides two operational modes.
Switch S1 Positions for AGC Stations
The mode you decide to use to balance an AGC station determines the position in
which you place switch S1.
which you place switch S1.