- 21 -
PADT 6400
• 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.
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 46).
Please note thereby that many receivers cannot receive the channel
ranges S21 … S41 (306 … 466 MHz).
Channel setting (only modulators "A" and "C"):
FREQ
834.00 MHz
Bx 4A
C66
FREQ
850.00 MHz
Bx 4C
C68
—>
The channel setting is only possible at modulators "A" and "C".
• Use buttons
to select the cursor position for channel setting.
• Use buttons
to adjust the desired channel.
Содержание PADT 6400
Страница 1: ...Assembly Instruction PADT 6400 ...