Cisco Cisco Prisma II EDR Receiver インストールガイド
78-715189-01 Rev C
Operation
3-5
Ensuring a Flat Output Signal by Adjusting the Step Equalizer
Variable Equalizer Adjustment Procedure
Important: The following procedure assumes that you have adjusted the variable
pad, if necessary, to ensure that the signal strength is correct.
For your system to operate properly, the output signal must remain flat across all
For your system to operate properly, the output signal must remain flat across all
channels. To use the step equalizer to ensure that the output signal is flat, follow
these steps.
1.
On the back of the chassis, locate the amplifier’s RF output port.
Note: HEDA output connectors are on Port B row.
Note: HEDA 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 the output level at the highest system frequency and lowest system
frequency.
4.
Use the following formula to determine output tilt.
Tilt = L
High
- L
Low
Where:
Tilt = amplitude difference between the highest and lowest frequency
L
High
= signal level of the highest frequency
L
Low
= signal level of the lowest frequency
5.
Using a
1
/
8
-in. flat-blade screwdriver, turn the tilt setting on the front panel of
the amplifier so the signal is flat across all channels. Refer to the following
table:
Amount of Signal Equalization
Tilt Setting
Forward
Reverse
A
0.0 dB
0.5 dB
B
1.0 dB
1.5 dB
C
2.0 dB
2.5 dB
D
3.0 dB
3.5 dB
E
4.0 dB
4.5 dB
MAX
5.0 dB
5.5 dB