Cisco Prisma II 1310 nm HDTx Transmitters Installation Guide
78-715189-01 Rev C
Operation
3-3
Operating the HEDA,
Continued
Verifying RF Output
It is important to make sure that RF output is within the desired range before you
adjust the variable pad and equalizer. Otherwise, the HEDA will not operate
properly.
Follow the procedure below to verify the RF output of the HEDA.
Follow the procedure below to verify the RF output of the HEDA.
1.
On the back of the chassis, locate the port for RF output used by the amplifier.
Note: Output connectors are on Port B row.
Note: Output connectors are on Port B row.
2.
Using a 7/16-in. open-end wrench, disconnect the RF cable designated for the
RF output of the amplifier and connect a test cable from the RF output
connector to a spectrum analyzer. Torque the connector to the specifications
given by the connector manufacturer. Do not over tighten.
3.
Measure output level of the amplifier for the lowest carrier level.
4.
Verify that when the variable pad is set to 0, the RF output level of the
amplifier is within +3 dBmV of the desired input level of the device being fed.
IF the amplifier RF output is . . . THEN . . .
within +3 dBmV of the desired
record this value in your
transmitter input level
Maintenance Log. Refer to the sample
Maintenance Log in appendix A.
more than +3 dBmV of the
refer to the appropriate section in
desired transmitter input level
Chapter 4 for assistance in
troubleshooting.
less than the desired input level refer to the appropriate section in
Chapter 4 for assistance in
troubleshooting.
5.
Go to the next procedure, Ensuring Proper Signal Strength and Adjusting
the Selectable Pad.