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CGS-2 764 C
m
odul ator
on
/
off
, l
evel
This menu item is used to set the output levels of the modulators of the modul´s
channel strips to the same value and to level them to the output levels of the
modulators of other modules used and to switch the modulators on or off.
LEVEL
– 3 dB
Bx 4A
on
Level setting:
• Measure and note down the output level of all modulators (of the whole
head-end station).
• By pressing
adjust the higher output levels to the output level of the
modulator with the lowest output level incrementally.
Switching the modulator on or off:
• Use the button to place the cursor under "on" resp. "off".
• Use the
buttons to switch each modulator on or off.
• Press the button.
—> The "Channel / Frequency" – "
FREQ
" submenu is activated.
C
hannel
/ f
reQuenCy
In this menu you can adjust the output channel (only at modulator A and C) or
the output frequency of the respective modulator.
—> The QAM signal is normally transmitted with a bandwidth of 8 MHz.
This means that you can only use the existing channel grid in the
range of channels C21…C69 (frequency grid 8 MHz).
The CCIR channel grid is 7 MHz in the range of the lower frequency
bands (channels C5 … C12, S2…S20). If 8 MHz QAM signal
packages are transmitted in these channel ranges, this will result in
interference (overlapping) and transmission problems.
For programming in these channel ranges and in the frequency rang-
es below them, we recommend starting with frequency 306 MHz
going back in steps of 8 MHz (see frequency table on page 37).
Please note thereby that many receivers cannot receive the channel
ranges S21 … S41 (306 … 466 MHz).
