- 25 -
CGT 660
i
nverting
the
user
signal
For exceptional cases and "older" digital cable receivers, the spectral position
of the user signal can be inverted.
• Use
to position the cursor under "
normal
".
• Use
to set the spectral position to "
inverse
".
• Press the
button.
—> The "Output data rate" – "
STUFFING
" menu is activated.
o
utput
data
r ate
Bx 1A
SR=6900 (6531)
STUFFING:
number 1 number 2
SR=6900
(= "number 1"): Active output symbol rate
(
6531
) (= "number 2"): Current measured output symbol rate.
—> If the station filter is activated, this value will be less than the value of
"number 1". The value will fluctuate, as the data rates for individual
stations are dynamically altered by the broadcasters.
•
Use the
buttons to position the cursor under the digit to be set for
"number 1", then use
to set the symbol rate. The value set corresponds to
the new output symbol rate.
Increasing the value of "number 1"
—> The value of "number 1" can be increased as required up to 7500.
—> Symbol rates > 7000 kSymb/s increase the bandwidth of the out-
put signal. Thus the output channels will overlap. In this case the
bandwidth of the neighbouring-channels has to be decreased (see
"SelecPlex
®
Approximately calculation of the output bandwidth:
Symbol rate [MSymb/s] x 1.15 = Bandwidth [MHz]
7.2 [MSymb/s] x 1.15 = 8.28 [MHz]
6.9 [MSymb/s] x 1.15 = 7.935 [MHz]
