Cisco Cisco 1 GHz GainMaker Amplifier インストールガイド
Chapter 4 Troubleshooting
Possible cause
Solution
There are proper reverse RF signals
at the Main, Aux 1, and Aux 2
reverse input test points, but a low or
degraded signal at the reverse output
test point.
Verify that the amplifier module is receiving
the proper DC voltages. Refer to No DC Power
(on page 83).
Measure the main reverse input test point and
the reverse output test point. Subtract the
reverse amplifier gain and add the pad values
and EQ insertion loss to verify proper reverse
amplifier gain.
Verify that all the proper accessories, pads,
EQs, and signal directors (if applicable) are
firmly installed in the correct locations.
Verify that the factory installed accessories are
firmly installed in the correct locations.
Verify that the reverse switch and its jumpers
are properly and firmly installed.
Note: Verifying factory installations involves
Note: Verifying factory installations involves
removing the amplifier module cover. Reinstall
the amplifier module cover properly or RF
signal degradation may result.
Reverse RF signal still low or
degraded.
Verify that any unused RF ports are properly
terminated.
Use a spectrum analyzer to look at the reverse
RF input signal spectral quality at each reverse
input test point and compare it to the reverse
RF output signal spectral quality.
–
–
If degradation is generated in the reverse
amplifier, replace the reverse amplifier.
–
If degradation is generated by the
downstream amplifier reverse RF signal,
troubleshoot the RF amplifier feeding this
station.
Replace the amplifier module.
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