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HMPT 1000 C
• Press the
button.
—> The "QAM modulation, inverting the user signal" – "
QAM
" menu is
activated.
Programming the channel strip "
A
" with a CA module installed the
"PID monitoring" – "
CA
" menu is activated (page 44).
qam
modul ation
,
i
nverting
the
user
signal
In this menu, you can set the QAM modulation and for exceptional cases and
"older" digital cable receivers invert the spectral position of the user signal
"
inverse
".
Bx 4A
64-QAM
QAM
normal
s
et ting
the
qam
modul ation
• 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.
i
nverting
the
user
signal
• Use the
buttons to place the cursor under "
normal
".
• Use
to set the spectral position to "
inverse
".
• Press the
button.
—> The "Output symbol rate" – "
STUFFING
" menu is activated.
