Cisco Cisco 1 GHz GainMaker Amplifier インストールガイド
Preparing for Forward Path Balancing
45
whose loss characteristics are driven by DC control voltage.
The position of switch S1 sets the DC control voltage driving the Bode according to
the setup mode or operational mode required for the station.
the setup mode or operational mode required for the station.
Refer to the following table for more information on choosing the correct switch
position for your application.
position for your application.
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.
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
Line extender Only
Line extender Only
Position 2
NOT USED
NOT USED
Position 3
Line Extender and Coax
Line Extender and Coax
A thermistor (thermal) driven
circuit on the line extender sets
the DC control voltage that
drives the Bode.
This circuit detects the line
extender’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
meant to compensate for the
temperature related level
variations of the line extender
only. This switch position is
normally selected when
underground cable precedes the
station, since such cable is
subject to little temperature
variation.
circuit on the line extender sets
the DC control voltage that
drives the Bode.
This circuit detects the line
extender’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
meant to compensate for the
temperature related level
variations of the line extender
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
Backoff potentiometer will affect
line extender gain with S1 in this
position, once S1 is set to position
1 or 3, the manual potentiometer
setting will not affect proper
thermal line extender operation.
Leaving the switch in this position
disables the thermistor (thermal)
driven circuit and enables the
backoff potentiometer on the line
extender. 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
to verify proper station gain with
a given amount of manual gain
backoff.
position. This position is reserved
for stations with an AGC
installed.
While adjustments to the Manual
Backoff potentiometer will affect
line extender gain with S1 in this
position, once S1 is set to position
1 or 3, the manual potentiometer
setting will not affect proper
thermal line extender operation.
Leaving the switch in this position
disables the thermistor (thermal)
driven circuit and enables the
backoff potentiometer on the line
extender. 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
to verify proper station gain with
a given amount of manual gain
backoff.
A thermistor (thermal) driven
circuit on the line extender sets
the DC control voltage that drives
the Bode.
This circuit detects the line
extender'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
meant to compensate for the
temperature related level
variations of both the line
extender and the coaxial cable
preceding the station.
This switch position is normally
selected when overhead cable
precedes the station, since such
cable is subject to temperature
variation.
circuit on the line extender sets
the DC control voltage that drives
the Bode.
This circuit detects the line
extender'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
meant to compensate for the
temperature related level
variations of both the line
extender and the coaxial cable
preceding the station.
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 line extender without the proper input signals.
1 Connect the test equipment to the forward input test point shown in the
1 Connect the test equipment to the forward input test point shown in the
illustration below.