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Producing a QAM signal for testing
The Cassette generates a QAM signal for testing, without
there having to be an input signal.
In the second menu line, the corresponding output symbol
rate e.g.
“6900 kBd
”
(=
6,900 kilosymbols per second) is shown.
• Press the
button.
—> The menu “Inverting the user signal” –
“
OUTPUT: Spectrum
” is activated.
Inverting the user signal
For exceptions and “older” digital cable receivers, the spec-
tral position of the user signal can be inverted (“inverse”).
• By pressing
, set the spectral position “
normal
” or
“
inverse
”.
• Press the
button.
—> The menu “QAM monitoring” – “
MODE:
”
is
activated.
Bx 1A
RANDOM 6900
OUTPUT:
kBd
Bx 1A
RANDOM 6900
OUTPUT:
kBd
Bx 1A
Spectrum
OUTPUT:
normal
normal / inverse
Bx 1A
Spectrum
OUTPUT:
normal
normal / inverse
