Operating instructions

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12 Amplifier Setup
BLE*/* Installation and Operation Manual
Table 3-4 provides the AGC pad values for other output levels. Recommended pad values are
shaded.
Table 3-4
BLE*/* AGC pad levels
BLE*/* ADU Control Range (dBmV)
AGC Pad
(10 to 14 dB tilt)
Minimum Level
at 547.25 MHz
Midpoint Level
at 547.25 MHz
Maximum Level
at 547.25 MHz
-
35 39 43
0
00
0
36 40 44
1
11
1
37 41 45
2
22
2
38 42 46
3
33
3
39 43 47
4
44
4
40 44 48
5
55
5
41 45 49
6
66
6
42 46 50
7
77
7
43 47 51
8
88
8
44 48 52
9
99
9
45 49 53
10
1010
10
46 50 54
11
1111
11
47 51 55
12
1212
12
48 52 56
13
1313
13
49 53 57
The use of the ADU or TDU is recommended for improved output level stability although you
can operate the BLE*/* in the manual mode. Select manual mode by placing the drive control
select jumper, illustrated in Figure 2-9, in the
MAN position. The gain of the BLE*/* is then
determined by the potentiometer marked
MAN on the amplifier cover.
Return Path Alignment
The following subsections describe the BLE*/* alignment procedures required for proper
performance in the return path.
Before You Begin
Before you begin to set-up the amplifier and perform return-path alignment, please read the
following instructions and recommendations.
For proper return alignment obtain:
! RF alignment levels and insertion points for all BLE*/*s
! RF reference output level of the headend optical receivers