18
Basic installation and configuration
/Module configuration
output configuration
This permits the modification of the operating
parameters for the master STC module output. To
enter from
headend > headend modUle
liSt
, click on the magnifying glass icon of the
master module. Go to
SettingS > oUtpUt
.
parameterS:
F
freqUenCy (mhz)
: permits the value of
the output frequency to be modified.
F
ofdm
mode
: click on the dropdown
menu to select the OFDM transmission
parameter.
F
bandwidth (mhz):
click on the drop
down menu to select the band width value for the output signal.
F
gUard interval
: click on the dropdown menu to select the guard interval for
the OFDM signal.
F
ConStellation
: click on the dropdown menu to select the digital constellation
layout.
F
Code rate
: click on the dropdown menu to select the FEC coding convolution
code
.
F
attenUation (db)
: click on the displacement bar to modify the output level of
the signal.
NoTE
The advanced parameters may only be modified in special cases, in the majority
of installations the factory settings should not be changed.
advanCed parameterS
: click on the right-
hand checkbox to display the
advanCed param-
eterS
menu.
F
i-q format:
click on the dropdown menu
to select the form (
normal
or
invert-
ed
) of the I-Q output channel spectrum.
NoTE
To modify the value of the
Cofdm window
remember that when the band-
width of the COFDM output is reduced, the interference from the adjacent chan-
nel is reduced, but the efficiency of the guard interval is reduced proportionally
and may prevent the tuning of the receivers.
F
Cofdm window:
click on the horizontal displacement bar to modify the band
width of the COFDM channel output.
F
Cell id:
click on the horizontal displacement bar to modify the number of cells to
be allocated to the COFDM channel output.
