User’s manual · TWSQ 310 CI
- 13 - TWSQ 310 CI version_en_1.0 FTE maximal
- Freq (Input Frequency (MHz)): Transponder frequency that you wish to tune. In order to introduce the frequency, press
the “OK” button and the cursor will be placed over the frequency. With the keys of the cursor, we can move through all the
digits and change the values. Press “OK” in order to save the value.
- Symbol Rate: Symbol speed required by the transponder. In order to introduce the symbol rate, press the “OK” button and
the cursor will be placed over the frequency. With the keys of the cursor, we can move through all the digits and change
the values. Press “OK” in order to save the value.
- Antenna: Feeding/tone towards the LNC. Options: 0V, 13V, 13V+22kHz, 18V, 18V+22KHz, 13V+AUT, 18V+AUT.
- DiseqC: In this option you can set the DiseqC configuration: A, B, C, D and None.
- Auto SR (Auto Symbol Rate): You will be able to select if the detection of the Symbol Rate is going to be Automatic (On)
or Manual (Off).
- In Manual mode (Off), the value of the Symbol Rate should be fixed by the user based on the provider’s
information.
- In Automatic mode (On), the meter will automatically identify the SR when a Satellite carrier is tuned. This
feature is very useful when the provider’s information is unknown.
The SR value found will appear in the field of selection of the SR menu. This value found by the meter could not
correspond exactly to the real broadcast SR, but to a very close value.
Note: The Automatic Symbol Rate feature does not work when the carrier quality is very poor or/and with a very
low Power Level.
-
Mode: This option allows selecting the standard DVB of the transponder that you want to tune. Options: DVB-S1,
DVB-S2 and auto.
Cable modulator ( Out Cable)
This option allows you to configure the DVB-C modulator that the device has.
- Spectrum inversion: Activate or deactivate the spectrum inversion in the
modulation.
- Modulation: Modulation Format. Options: 16 QAM, 32 QAM, 64 QAM, 128 QAM,
256 QAM.
- Roll-off factor: Roll-off factor reduces the interference between symbols thanks to the raised cosine filtering, the bigger
this value is, the less interference between symbols that will be caused. Typical Value according to rules DVB-C =15 %.
Options: 1.5, 1.3.
- Symbol speed: The available symbol speed ranges from 1000 to 7000 S/s.
In order to estimate the output symbol speed you have to take into account the following parameters: input
modulation, input symbol speed, input FEC, output modulation.
For example, for a 8PSK signal with 22000 MS/s and a FEC 2/3, the output symbol speed should be calculated
according to the chosen QAM modulation.
(
)
(
)
(
)
(
)
QAM
symbol
nºbit
QAM
symbol
nºbit
PSK
symbol
nºbit
FEC
SYMBOL.IN
V
SYMBOL.OUT
V
⋅
⋅
⋅
=
⋅
⋅
⋅
⋅
=
3
3
2
22000
8
Modulation
QPSK
8PSK
16 QAM
32 QAM
64 QAM
128 QAM
256 QAM
Number of bits per
symbol
2 3 4 5 6 7 8
Modulation
16 QAM
32 QAM
64 QAM
128 QAM
256 QAM
Symbol speed (MS/s)
11000 8800 7333
6286 5500
Output configuration ( TV output)
In these options you can configure the output parameters of the terrestrial signal.
- RF Channel (MHz): Output frequency of terrestrial modulation. In order to
introduce the frequency, press the “OK” button and the cursor will be placed over
the frequency. With the keys of the cursor, we can move through all the digits and
change the values. Press “OK” in order to save the value. Options: 47-862 MHz.
- RF Level: Regulation of the output level of the modulated signal. Options: 0-15dB.
TWSQ310CI *Out Cable
Modulacion: 64
>Roll-off: 1.5
Symbol speed: 1000
TWSQ310CI *Out TV
>RF Channel: 474000
RF Level: 013
Содержание TWSQ 310 CI
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