Operating Instructions
ProTelevision Technologies
PT 5780 DVB-T Modulator
Instruction Manual
Revision 3.11
4-26
o
Spectrum
(Sub-menu ID 7356): User definition of the spectrum polarity for
of the received signal at the tuner input. Default setting is Normal (carrier 1
located at lowest frequency). Selectable settings are Normal and Inverted
(carrier 1 located at highest frequency).
§
Reset UCE
(sub-menu ID 7360): This menu contains the reset function for the
demodulator 1 UCE counter (counter value displayed in the Demodulator 1 bit error
rate status display (index f2).
•
DEMODULATOR 2
(sub-menu ID 7400): contains sub menus for definition of the mode and
function for the demodulator number 2 (only available if Demodulator-2 option PT 8722 is
installed).
§
Reset UCE
(sub-menu ID 7410): This menu contains the reset function for the
demodulator 1 UCE counter (counter value displayed in the Demodulator 1 bit error
rate status display (index f2).
§
SETTINGS CONTROL
(sub-menu ID 7420): This sub menu allows the user to
select whether Demodulator 2 shall automatically be synchronised to the setting of
Demodulator 1 (
synchronisation ON
) or if the setting of demodulator 2 is to be
explicitly set by the user (
synchronisation OFF
)
§
BANDWIDTH
(sub-menu ID 7430): 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 7440): 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 LP and HP. This menu is only available if one of the
hierarchical modes is selected via the transmission parameter menu.
§
PARAMETER MODE
(sub-menu ID 7450): 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 7460): User definition of the demodulation
parameters (this menu is only available if manual mode is selected via sub menu
7450).
o
Hierarchical mode
(Sub-menu ID 7461): 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 7462): 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 7463): 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 7464): 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 7465): 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.
o
Spectrum
(Sub-menu ID 7466): User definition of the spectrum polarity for
of the received signal at the tuner input. Default setting is Normal (carrier 1
Summary of Contents for PT 5780
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