Cisco Cisco 1 GHz GainMaker Amplifier Guida All'Installazione
Preparing for Forward Path Balancing
setup mode or operational mode required for the station.
Refer to the following table for more information on choosing the correct switch position
Refer to the following table for more information on choosing the correct switch position
for your application.
Note: Consult your system technical supervisor or manager for more information about
Note: Consult your system technical supervisor or manager for more information about
which choice of setup mode to use as this may be dictated by your system or corporate
engineering policy.
Switch S1 Position Information for Thermal Configured Stations
Position 1
Amplifier Only
Position 2
NOT USED
Position 3
Amplifier and Coax
A thermistor (thermal) driven
circuit on the amplifier sets the
DC control voltage that drives
the Bode.
This circuit detects the
This circuit detects the
amplifier’s internal temperature
and generates the proper level
of DC control voltage, setting
the proper loss characteristics of
the Bode with respect to the
current outdoor temperature.
Note: This switch position is
Note: This switch position is
meant to compensate for the
temperature related level
variations of the amplifier only.
This switch position is normally
selected when underground
cable precedes the station, since
such cable is subject to little
temperature variation.
Important! Do not select this
position. This position is reserved
for stations with an AGC
installed.
While adjustments to the Manual
While adjustments to the Manual
Backoff potentiometer will affect
amplifier gain with S1 in this
position, once S1 is set to position
1 or 3, the manual potentiometer
setting will not affect proper
thermal amplifier operation.
Leaving the switch in this position
Leaving the switch in this position
disables the thermistor (thermal)
driven circuit and enables the
backoff potentiometer on the
amplifier. This sets the DC
control voltage that drives the
Bode to a constant setting,
regardless of the current outdoor
temperature.
Note: This is a factory setting used
Note: This is a factory setting used
to verify proper station gain with
a given amount of manual gain
backoff.
A thermistor (thermal) driven
circuit on the amplifier sets the
DC control voltage that drives the
Bode.
This circuit detects the amplifier's
This circuit detects the amplifier's
internal temperature and
generates the proper level of DC
control voltage, setting the proper
loss characteristics of the bode
with respect to the temperature.
Note: This switch position is
Note: This switch position is
meant to compensate for the
temperature related level
variations of both the amplifier
and the coaxial cable preceding
the station.
This switch position is normally
This switch position is normally
selected when overhead cable
precedes the station, since such
cable is subject to temperature
variation.
Note: Switch S1 in Position 2, and the backoff potentiometer, are used in AGC stations only.
To Verify the Input Signal Level
Complete the following steps to test the input signal level.
Important: You cannot balance the amplifier without the proper input signals.
Important: You cannot balance the amplifier without the proper input signals.
1
Connect the test equipment to the forward input test point shown in the illustration
below.
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