Cisco Cisco Prisma II EDR Receiver Installation Guide
1-6
Introduction
78-715189-01 Rev C
The HEDA Front Panel,
Continued
Power and Alarm Indicators
Two indicators give you the status of the HEDA.
•
•
The green POWER ON indicator turns on and stays on as long as power is applied
to the HEDA.
•
The red ALARM indicator blinks when either of the following conditions occurs.
- High current draw through the HEDA
- Low current draw through the HEDA
- Low current draw through the HEDA
•
The red ALARM indicator illuminates continuously when there is a loss of RF
signal or loss of current through the HEDA.
Pad and Equalizer Adjustment
You can quickly balance the HEDA by inserting a 1/8
-in. flatblade screwdriver into
the open slots labeled PAD and TILT. Two recessed adjusters just inside the front
panel allow adjustment of the pad and tilt settings to values shown in the following
tables.
Pad Setting
Loss Introduced
Tilt
Setting
Amount of Signal Equalization
0
0 dB
Forward Model
(46-870 MHz)
Reverse Model
(5-200 MHz)
1
1 dB
A
0.0 dB
0.5 dB
2
2 dB
B
1.0 dB
1.5 dB
3
3 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
-20 dB Test Point
The connector labeled “1” provides a sample of the RF drive signal going directly
into the amplifier. Since this signal feeds off a -20 dB RF directional coupler in line
with the amplifier, you must add 20 dB to the reading you get at this test point to
determine the actual RF input level.