TechniSat SkyCable QPSK/DVB-T CI TWIN - Handbuch (Seite 71)

71
EN
3.11.2.4 Display Line 3
Select line 3 as described in 3.11.2.2
If the flashing cursor is located in the third line the following sub-items can
be called up by repeatedly pressing the Menu button:
1.
RF Frq:506,0MHz
= RF output frequency
2. RF Attn:00dB = RF T-pad attenuator
3. COFDM Mode:64QAM = Carrier modulation
4.
BandWidths:8M
= Channel bandwidth
5.
FEC:7/8
= Forward error correction
7. GuardInter:1/32 = Guardintervall
7. Modulation:YES = Modulation On/Off
8.
SPEC:Invert
= Invert modulation spectrum
1.
RF Frq:506,0MHz
RF output frequency
The frequency output is entered in MHz using the numeric buttons. This is
the channel centre frequency in COFDM signals. The correct frequencies
can be taken from the table in section 5.5.
The data is transferred when the OK button is pressed.
2.
RF Attn:00dB
RF T-pad attenuator
The attenuation value for the output level is entered using the numeric
buttons. A max. 9dB can be set.
The data is transferred when the OK button is pressed.
Watch the linearity of the wanted signal level for all the TWIN cards and
adjust the output level by setting it to the RF T-pad attenuator, while
watching the level parameters (see 5.6).
3. COFDM Mode:64QAM Sub-carrier modulation scheme
Press the ► or ◄ cursor button to set the sub-carrier modulation scheme.
The data is transferred when the OK button is pressed.
QPSK = 2 Bits/symbol, maximum data rate 10,56 MBits/s
16QAM = 4 Bits/symbol, maximum data rate 21,11 MBits/s
64QAM = 6 Bits/symbol, maximum data rate 31,67 MBits/s
4. Bandwidths:8M Channel spacing
Press the ► or ◄ cursor button to set the channel spacing of 6, 7 or 8
MHz. The data is transferred when the OK button is pressed.
5.
FEC:7/8
Convolution coding (FEC)
Press the ► or ◄ cursor button to set the forward error correction. The
data is transferred when the OK button is pressed.
1/2 = Highest
2/3 = Normal
3/4 = Adequate
5/6 = Low
7/8 = Very low
6.
GuardInter:1/32
Guard interval
Press the ► or ◄ cursor button to set the guard interval. The data is
transferred when the OK button is pressed.
1/4 = Long 1/16 = Short
03:QPSK->COFDM A
Tuner Lock:Yes
RF Frq:506,0MHz
P010,010,110,105