PT 5780 DVB-T Modulator
ProTelevision Technologies
Operating Instructions
Instruction Manual
Revision 3.11
4-25
4.3.4.9
RECEPTION Menu System (Menu ID 7000)
The RECEPTION menu is only available with the DVB-T Re-Modulator PT 5788 (RF Tuner
must be enabled). The reception menu contains sub menus for user definition of the tuner
reception frequency and bandwidth and for definition of the mode and function for the
demodulator(s):
•
FREQUENCY
(sub-menu ID 7100): Allows user specification of the centre frequency for the
DVB-T channel to be received. The default setting is 474MHz (CH E21). The range available
is 30 – 954MHz in steps of 1Hz.
•
BANDWIDTH
(sub-menu ID 7200): Allows user specification of the IF filter bandwidth. The
default setting is 8MHz. Selectable settings are 8 and 7 MHz. (6MHz bandwidth requires
installation of additional filter option).
•
DEMODULATOR 1
(sub-menu ID 7300): contains sub menus for definition of the mode and
function for demodulator number 1.
§
FUNCTION
(sub-menu ID 7310): User definition of the function of Demodulator 1.
Two choices are available:
Reception Demodulator
where the input for the
demodulator is taken from the tuner module and
Output Monitor
where the input for
the demodulator is taken from the output of the IF modulator module.
§
BANDWIDTH
(sub-menu ID 7320): User definition of the bandwidth setting for
Demodulator 1. The bandwidth must be set in accordance with bandwidth of the
applied DVB-T signal. Default setting is 8MHz. Selectable settings are 8, 7 and
6MHz.
§
PRIORITY
(sub-menu ID 7330): User definition of the virtual channel to be extracted
from the DVB-T signal by hierarchical mode. Default setting is HP channel.
Selectable settings are HP and LP.
§
PARAMETER MODE
(sub-menu ID 7340): User definition of the method used for
setting the reception parameters of the demodulator. Two choices are available:
Auto
mode where the demodulation parameters (Hierarchy, FFT, Code rate,
constellation, guard interval and spectrum polarity) are automatically set by the
demodulator in accordance with the received signal and
Manual
mode where the
demodulation parameters must be set explicitly by the user. Default setting is Auto
mode.
§
DEFINE PARAMETERS
(sub-menu ID 7350): User definition of the demodulation
parameters (this menu is only available if manual mode is selected).
o
Hierarchical mode
(Sub-menu ID 7351): User definition of the hierarchical
mode of the received signal. Default setting is None hierarchical. Selectable
settings are none, alpha-1, alpha-2, alpha-4.
o
IFFT
(Sub-menu ID 7352): User definition of the IFFT mode of the received
signal. Default setting is 8K. Selectable settings are 2K and 8K.
o
Code rate
(Sub-menu ID 7353): User definition of the code rate of the
received signal. Default setting is 2/3. Selectable settings are ½
, 2/3, ¾
, 5/6
and 7/8.
o
Constellation
(Sub-menu ID 7354): User definition of the constellation type
of the received signal. Default setting is 64QAM. Selectable settings are
QPSK, 16QAM and 64QAM.
o
Guard
(Sub-menu ID 7355): User definition of the guard interval of the
received signal. Default setting is 1/8. Selectable settings are ¼, 1/8, 1/16
and 1/32.
Содержание PT 5780
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