- 24 -
PHDQ 8008 TSR
Setting the QAM modulation
Inverting the user signal
In this menu, you can set the QAM modulation and invert the user signal.
For exceptional cases and "older" digital cable receivers, the spectral position
of the user signal can be inverted.
Bx 4A
256-QAM
QAM
normal
Setting the QAM modulation
•
Use
to set the QAM modulation ("
4
" … "
256
").
—>
For higher QAM modulation, the output symbol rate is lowered.
—> An output QAM modulation of > 64 QAM places a large burden on the
cable network. Due to noise, delay and frequency response problems,
reception of the converted output signal can be impeded.
Inverting the user signal
• Use
to place the cursor under "
normal
".
• Use
to set the spectral position to "
inverse
".
• Press the
button.
—> The "Setting stuffing" – "
STUFFING
" menu is activated.
Setting stuffing
Bx 4A
SR=6900 (6325)
STUFFING
Number 1 Number 2
SR=6900
(= "Number 1"): Active output symbol rate
(
6325
) (= "Number 2"): Current measured output symbol rate.
—> This value must be less than the value of "Number 1". If necessary re
-
move stations using the software
PSW 1000
or increase the value of
"Number 1".
—> The value fluctuates, since the data rates of individual stations are dy
-
namically modified by the broadcasters.
—> "Number 2" is not displayed in the channel strips "
A
" or "
B
" at the set-
tings "
OUTROUTE 1=>ASI ASI=>MA
" or "
2=>ASI ASI=>MB
", for
the symbol rate of the ASI input signal cannot be measured. The ASI
