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RF-6000E Operations Manual
Chapter 1. Overview — 11
Table 4, Transmit Power Backoff
per Modulation Type
Modulation Type
Backoff
Level 2 PA Output
Without Radio FEC
With Radio FEC
FM Analog, 24 ~ 96 FDM
0.0 dB
30.0 dBm
30.0 dBm
FM Analog, 120 ~ 300 FDM
0.0
30.0
30.0
FM Analog, 420 ~ 2400 FDM
0.0
30.0
30.0
FM Analog, Color Video
0.0
30.0
30.0
FSK, MSK
0.0
30.0
30.0
BPSK 1.0
29.0
29.0
QPSK, OQPSK, 4PSK, 4QAM
2.0
28.0
28.0
8PSK 4.0
26.0
26.0
16APSK 8.0
22.0
24.0
32APSK 10.0
20.0
22.0
16QAM 6.0
24.0
24.0
32QAM 8.0
22.0
24.0
64QAM 10.0
20.0
24.0
128QAM 12.0
18.0
23.0
256QAM 13.0
17.0
22.0
512QAM 14.0
16.0
21.0
1024QAM 15.0
N/A
20.0
2048QAM 16.0
N/A
19.0
32TCM 9.0
21.0
24.0
64TCM 10.0
20.0
24.0
128TCM 12.0
18.0
23.0
256TCM 14.0
16.0
21.0
OFDM QPSK
11.0
19.0
20.0
OFDM 16QAM
15.0
15.0
18.0
OFDM 64QAM
19.0
11.0
16.0
COFDM QPSK
6.0
24.0
26.0
COFDM 16QAM
9.0
21.0
25.0
COFDM 64QAM
13.0
17.0
21.0
9QPRS/QPR3 5.0
25.0
25.0
25QPRS/QPR5 5.5
24.5
24.5
49QPRS/QPR7 6.0
24.0
24.0
81QPRS/QPR9 7.0
23.0
23.0
225QPRS/QPR15 9.0
21.0
21.0
14
Transmit power set point is reduced as the modulation becomes more complex.
This power “backoff” provides adequate linearity as required by the system performance objectives.
The ALC adjustment on each amplifier is used to set the output power level. To calculate the repeater’s output power at
the antenna port flange, take the amplifier power output without backoff, reduce that level by the backoff listed in this
table, then subtract the transmit branch loss for the specific configuration from Tables 2 or 3.
For Example: Level 2 Amplifier Power Output = +30 dBm without backoff reduction,
Modulation is 256QAM, therefore backoff = 13.0 dB, RF-6000E-041 Tx Branch Loss = 2.5 dB,.
Output power at antenna port flange = +30.0 – 13.0 – 2.5 = +14.5 dBm.
15
Modulations listed are the most popular types. List is not exclusive. If a modulation is not listed, contact the company for
specific details.
16
Backoff values without considering radio forward error correction (FEC). Radio FEC can correct for a modest
amount of added in-band distortion products resulting in greater amplifier output power permissible.