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■
RF LEVEL ADJUSTMENT
1.
Remove the coaxial bridge from the RF channel
output (8) of module 1 beside the power source.
2.
Adjust the output level to 75 dBμV via UCF 300
(see point 2 Programming).
3.
Connect the 75 Ω axial bridge again.
4.
Taking the measurement at the SHA or SAC amplifier
output, adjust the levels of the other modules so that
they are equalised to the level of module 1,
which has already been adjusted.
5.
Adjust the amplifier gain, taking into account its
maximum output level and the reduction according
to the number of the channels in the installation,
as shown in Table 1.
Tab. 1
Number of
2 4
channels COFDM
Reduction of the
maximum output
3 6
level (dB)
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LED FUNCTIONS
Status LED:
●
Green color: Tuner tuned
●
Yellow color: Signal problems
●
– Unsyncronized tuner.
– Program not found.
– Exceeded output BW > 92%.
– Out RF: OFF.
– CAM non detected (only for TTT-CI Modules)
Red color: Unit failure
●
Communication LED: Yelow: waiting for data.
●
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FAQs:
How many programs fit on an RF, COFDM, UHF,
●
8 MHz channel?
The channel's output capacity is measured in MBs and
there is a direct relationship between the following:
Modulation: QPSK < 16 QAM < 64 QAM
●
Code Rate FEC:1/2 < 2/3 < 3/4 < 5/6 < 7/8
●
Save interval IG: 1/4 < 1/8 < 1/16 < 1/32
●
(maximum capacity shown in bold).
5
6
8 16 24 32 64
7
8
9 12 16 15 18
DVB-T (8MHz)
Modulation Code Rate T u = 1/4
1/2
2/3
QPSK
3/4
5/6
7/8
1/2
2/3
13,27
16 QAM
3/4
14,93
5/6
16,59
7/8
17,42
1/2
14,93
2/3
19,91
64 QAM
3/4
22,39
5/6
24,88
7/8
26,13
The number of programs depends on the amount
●
of information contained in each one.
16
Bitrate (Mbps)
T u = 1/8
T u = 1/16 T u = 1/32
4,98
5,53
5,85
6,64
7,37
7,81
7,46
8,29
8,78
8,29
9,22
9,76
10,05
8,71
9,68
10,25
10,56
9,95
11,06
11,71
12,06
14,75
15,61
16,09
16,59
17,56
18,10
18,43
19,52
20,11
19,35
20,49
21,11
16,59
17,56
18,10
22,12
23,42
24,13
24,88
26,35
27,14
27,65
29,27
30,16
29,03
30,74
31,67
6,03
8,04
9,05
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