Cisco Cisco Prisma II EDR Receiver Guía De Instalación
3-4
Operation
78-715189-01 Rev C
Ensuring Proper Signal Strength and Adjusting the Selectable Pad
Variable Pad Adjustment Procedure
Important:The following procedure assumes that you have verified the RF output
and that the selectable pad is set to 0.
To adjust the HEDA signal strength so that it meets the input requirements of the
To adjust the HEDA signal strength so that it meets the input requirements of the
device being fed, you may need to add attenuation to the input signal. Otherwise,
the amplifier will not operate properly. To ensure proper signal strength, follow
these steps.
1.
Check that the selectable pad is set to 0.
2.
Compare the actual RF output level obtained in the previous procedure to the
optimal input level required by the device to which the signal is being routed.
If the actual level is . . .
Then . . .
within ±0.5 dB of the
go to the next procedure, Ensuring
optimal level
a Flat Output Signal by Adjusting the
Variable Equalizer.
more than 0.5 dB of the
increase the input attenuator pad.
optimal level
Refer to the next step.
less than 0.5 dB of the
refer to the appropriate section in
optimal level
Chapter 5 for assistance in troubleshooting.
3.
Using a 1/8-in. flat-blade screwdriver, turn the pad setting on the front panel
of the amplifier so the attenuation is correct for your operation. Refer to the
following table.
Pad Setting
Amount of Attenuation
0
0 dB
1
1 dB
2
2 dB
3
3 dB
4.
Once you have set the pad correctly, adjust the step equalizer to ensure a flat
output signal. Refer to the following procedure, Ensuring a Flat Output
Signal by Adjusting the Step Equalizer.