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PADT 6400
o
utPut
signal
In this menu, you can set the bandwidth, the carrier modulation and the spectral
position of the output signal.
COFDM–MODE
POS
Bx 4A
!
8MHZ QAM64
Bandwidth of the output signal
To transmit the output signal in the channel range of C21 to C69 a bandwidth
of 8 MHz can be used.
In the channel range of C5 to C12 a bandwidth of
≤
7 MHz must be set.
If frequency setting is selected you can set the bandwidth dependent on the
frequency of the adjacent channel.
COFDM–MODE
POS
Bx 4A
!
8MHZ QAM64
• Use
to set the bandwidth of the output signal ("
5 MHz
" … "
8 MHz
").
Carrier modulation
In this menu item the carrier modulation is set. At this the setting "
QPSK
" corre-
sponds to the lowest and the setting "
QAM64
" to the highest output data rate.
• Use the
buttons to place the cursor under "
QPSK / QAM…
".
• Set the carrier modulation of the output signal using the
buttons
("
QPSK
", "
QAM16
", "
QAM64
").
—> A displayed "!" indicates an output data rate overflow (page 42).
COFDM–MODE
Bx 4A
!
Spectral position – inverting the user signal
For exceptional cases and "older" digital cable receivers, the spectral position
of the user signal can be inverted "
NEG
". The default setting is "
POS
".
• Use
to place the cursor under "
POS
".
• Use
to set the spectral position to "
NEG
".
• Press the
button.
