Cisco Cisco 1 GHz GainMaker Amplifier 설치 가이드
Balancing the Forward Path
4
Determine the outside temperature at the amplifier location.
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
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.
Temperature
445.25 MHz
Backoff level
547.25 MHz
Backoff level
870 MHz
Backoff level
1 GHz
Backoff level
60°C
140°F
0.0 dB
0.0 dB
0.0 dB
0.0 dB
55°C
131°F
0.4 dB
0.4 dB
0.5 dB
0.6 dB
50°C
122°F
.7 dB
0.8 dB
1.1 dB
1.2 dB
45°C
113°F
1.1 dB
1.2 dB
1.6 dB
1.7 dB
40°C
104°F
1.4 dB
1.5 dB
2.1 dB
2.3 dB
35°C
95°F
1.8 dB
1.9 dB
2.7 dB
2.9 dB
30°C
86°F
2.1 dB
2.3 dB
3.1 dB
3.5 dB
25°C
77°F
2.5 dB
2.7 dB
3.7 dB
4.0 dB
OL-31155-01
49