- 19 -
HDM 660 T
o
utput
levels
of
the
Channel
strips
This menu item is used to set the output levels of the modulators of the module´s
channel strips to the same value and to level them to the output levels of the
modulators of other modules used.
In order to prevent interference within the head-end station and the cable sys-
tem, the output level of the COFDM module must be lowered by 8 dB com-
pared to modules with analogue modulators.
Bx 1A
-3 dB
LEVEL
• Use the test receiver to measure the output level of the channel strip and
make note of the value.
• When adjusting the second channel strip, compare its value with the value
noted for the first channel strip.
• Measure the output levels of the modulators of other modules used and
make notes of their values.
•
Use the
buttons to balance the higher output level of the one channel
strip to the lower output level of the other channel strip and the output levels
of the modulators of other modules used ("
0 dB
" … "
–10 dB
").
• Press the
button.
Channel strip A:
—> The "LNB oscillator frequency" – "
LNB
"
menu is activated (page 20).
Channel strip B:
—> The "Tuner" – "
INPUT
"
menu
is activated.
t
uner
(
only
Channel
strip
b)
In this menu you can select which tuner (input A or B) is to use (only for channel
strip B). So t
he transport streams of the receiving stage "
A
" can be split into
two output transport streams.
Bx 1B
Tuner B
INPUT
• Press the
buttons to select the tuner wished.
