output point to the AMP2 input point + Gain of AMP2 + Gain from the AMP2 output point to
the AMP1 input point + Gain of AMP1
–
ATT3 + Gain from the AMP1 output point to the
RF OUT point
ATT2+ATT3=2.1≈2
describes the parameters in the formulas.
Table 6-3
Parameter description
Parameter
Description
Output level on an RF OUT port@1218
MHz
An expected value that is obtained based on
the network planning
Output power of a single CMC channel
Related command:
cable downstream
channel-id rf-power value
Power of digital TV signals output by Rx
Value measured using a tester at Rx test
point +20 dB
Gain from the DS to the AMP2 input point
(ATT1 = 0, EQ1 = 0)
≈
–
14.7 dB
Gain from Rx to the AMP3 input point
(ATT2 = 0)
≈ 3 dB
Gain from the AMP3 output point to the
AMP2 input point (EQ1 = 0)
≈
–
13.5 dB
Gain from the AMP2 output point to the
AMP1 input point (ATT3 = 0, EQ2 = 0)
≈
–
6 dB
Gain from the AMP1 output point to the RF
OUT point
≈
–
11.5 dB
NOTE
This is the gain when a splitter is configured for
the combiner. When a jumper is configured, the
gain is 3.5 dB higher.
Gain of AMP3
≈ 19 dB
Gain of AMP2
≈ 32 dB
Gain of AMP1
≈ 23 dB
Calculating the Total Output Power of AMP2
Take the channel (channel 114) whose center frequency is 114 MHz as an example:
Level of AMP2 output point: L
amp2_ch
114
= 36
–
EQ1 x (1218
–
114)/(1218
–
85) + (
–
14.7) + 32
After the levels of all channels at the AMP2 output point are calculated, calculate the total
output power at AMP2 using the following formula: P
amp2_total
=10*lgΣ(10
Lamp2_ch
114
/10
,
10
Lamp2_ch
120
/10
,... 10
Lamp2_ch
989
/10
). The result is: P
amp2_total
≈ 68.6 dBmV
MA5833-BS60
Hardware Commissioning Guide
6 Configuring Intelligent RF Adjustment
Issue 01 (2018-12-12)
Copyright © Huawei Technologies Co., Ltd.
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