Cisco Prisma II 1310 nm HDTx Transmitters Installation Guide
3-8
Operation
78-715189-01 Rev C
Checking the Operating Settings,
Continued
Checking RF Output
Complete the following steps to verify that the output level is within ±1.0 dB of the
value most recently recorded.
Note: To check the RF output without taking the amplifier out of service, check the
Note: To check the RF output without taking the amplifier out of service, check the
input test point of the module that the amplifier is feeding.
1.
Connect an RF cable from the RF TEST point on the next inline module to the
spectrum analyzer.
2.
Set the spectrum analyzer for the frequency span of your bandwidth.
3.
Measure the signal level and tilt and correct for the loss of that module’s RF
test point.
4.
Check that the output level is within ±1.0 dB of the value most recently
recorded.
Note: If the reading is not within the proper range, refer to Chapter 4 for
Note: If the reading is not within the proper range, refer to Chapter 4 for
assistance in troubleshooting.
5.
This portion of maintenance is complete. Record the reading.
6.
To complete weekly maintenance, go to the next procedure, Checking Pad
and Tilt Settings.
Checking Pad and Tilt Settings
Important: The input and output levels must be verified before any adjustments are
made to pad and tilt settings.
Complete the following steps to verify that the settings for pad and tilt are correct.
Complete the following steps to verify that the settings for pad and tilt are correct.
1.
Refer to your Maintenance Log to determine the most recently recorded
settings for pad and tilt.
2.
Compare the recorded settings to the current settings. If either setting does
not match, use a 1/8-in. flat-blade screwdriver and adjust the setting to the
value most recently recorded. Or, refer to the appropriate procedure given
earlier in this chapter.
•
•
Ensuring Proper Signal Strength and Adjusting the Variable Pad
•
Ensuring a Flat Output Signal by Adjusting the Variable Equalizer
3.
Weekly maintenance is complete. Record the reading.