Cisco Cisco 1 GHz GainMaker Amplifier Guide De Montage
Chapter 4 Troubleshooting
90
Low or Degraded Forward RF Signal
The forward RF signal can be measured at the line extender module forward input
and forward output test points.
and forward output test points.
Low or Degraded Forward RF Signal Troubleshooting Table
Before you begin troubleshooting for a low or degraded forward RF signal, verify
that the line extender is receiving the proper forward RF input signal from the
upstream equipment.
that the line extender is receiving the proper forward RF input signal from the
upstream equipment.
Important: You cannot balance the line extender without the proper forward RF
input signal.
input signal.
Make sure you have configured the line extender module according to the
specifications in the design print, and that the line extender has warmed up for
approximately one hour.
specifications in the design print, and that the line extender has warmed up for
approximately one hour.
Make sure you are using the proper tilt reference when setting levels. An 870 MHz, 1
GHz or 1.2 GHz design balanced at 550 MHz requires a corrected tilt reference to
compensate for the difference in carrier levels between 550 MHz and 870 MHz, 1
GHz or 1.2 GHz. The tilt reference at 550 MHz is lower than the tilt reference at 870
MHz, 1 GHz or 1.2 GHz. Refer to the tilt charts in Technical Information (on page 97)
for more information.
GHz or 1.2 GHz design balanced at 550 MHz requires a corrected tilt reference to
compensate for the difference in carrier levels between 550 MHz and 870 MHz, 1
GHz or 1.2 GHz. The tilt reference at 550 MHz is lower than the tilt reference at 870
MHz, 1 GHz or 1.2 GHz. Refer to the tilt charts in Technical Information (on page 97)
for more information.
Important: If the line extender cover was ever removed, make sure it was properly
reinstalled. Improperly reinstalling the line extender module cover may result in RF
signal degradation.
reinstalled. Improperly reinstalling the line extender module cover may result in RF
signal degradation.
Possible cause
Solution
Low or degraded forward RF signal
at the forward input test point.
at the forward input test point.
Verify that the line extender is receiving the
proper forward RF input signal from the
upstream equipment.
Important: You cannot balance the line
extender without the proper forward RF input
signal.
proper forward RF input signal from the
upstream equipment.
Important: You cannot balance the line
extender without the proper forward RF input
signal.