Cisco Cisco 1 GHz GainMaker Amplifier インストールガイド
Chapter 3 Balancing and Setup
50
4 Determine the outside temperature at the line extender location.
5 Refer to the Manual Backoff Chart to find the proper manual backoff level for the
5 Refer to the Manual Backoff Chart to find the proper manual backoff level for the
current temperature and reference frequency.
6 Turn the MANUAL BACKOFF potentiometer clockwise to reduce the output
level by the amount specified in the Manual Backoff Chart.
Note: After making this adjustment, do not adjust the MANUAL BACKOFF
potentiometer again.
Note: After making this adjustment, do not adjust the MANUAL BACKOFF
potentiometer again.
7 Proceed to the next section, To Determine the Output Tilt.
Manual Backoff Chart
The following table displays the manual backoff level for selected frequencies and
various temperatures.
various temperatures.
Temperature 445.25 MHz
Backoff level
(dB)
(dB)
547.25 MHz
Backoff level
(dB)
Backoff level
(dB)
870 MHz
Backoff level
(dB)
Backoff level
(dB)
1 GHz
Backoff level
(dB)
Backoff level
(dB)
1.2 GHz
Backoff level
(dB)
Backoff level
(dB)
60
C
140
F
0.00
0.00
0.00
0.00
0.00
55
C
131
F
0.26
0.26
0.37
0.41
0.43
50
C
122
F
0.55
0.56
0.80
0.85
0.93
45
C
113
F
0.86
0.91
1.27
1.36
1.51
40
C
104
F
1.17
1.25
1.75
1.87
2.08
35
C
95
F
1.49
1.59
2.22
2.38
2.67
30
C
86
F
1.81
1.93
2.69
2.90
3.26