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HDTA 614 T ASI
m
odul ator
on
/
off
, l
evel
This menu item is used to set the output levels of the four modulators to the
same value and to switch the modulators on or off.
LEVEL
– 3 dB
Bx 4A
on
• Measure and note down the output level of each modulator.
—> In order to adjust the output levels to the output levels of the other cas-
settes please pay attention to chapter "Final procedures" (page 43).
• Using the buttons
(ascending) or
(descending) activate the
"
LEVEL
" menus of all the modulators with higher output levels.
• By pressing
adjust the higher output levels to the output level of the
modulator with the lowest output level incrementally.
• 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 COFDM signal is normally transmitted with a bandwidth of
8 MHz. This means that you can only use the channel centre frequen-
cy of 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). If
8 MHz COFDM signal packages are transmitted in these channel
ranges, this will result in interference (overlapping) and transmission
problems.