- 30 -
PTIM 1000
Bx 4A
C30
0
INPUT
OK
-64…+64
• Use
for fine tuning the input channel ("
-64
"
…
"
+64
").
—> In addition to the indicator in the display, there is also a status LED
which indicates whether a transport stream is received or not:
7
8
9
0
!
#
$
3
2
6
5
@
%
4
1
2
Status LED of channel strip "
B
"
5
Status LED of channel strip "
A
"
LED indicator
Indication
Green
Signal available
Red
No signal
• Press the
button.
—> The menu "Hierarchical modulation" – "
INPUT Priority:
" is activated.
h
ier arChiCal
modul ation
In order to attain with less field strength a greater range for broadcasters,
with DVB-T so-called "hierarchical modulation" is used. In this process, several
data streams are modulated onto a DVB-T data stream using "Quadrature
Amplitude Modulation" (QAM). The robust "High Priority" data stream (HP)
with a lower data rate is modulated onto the more sensitive "Low Priority" data
stream, which possesses a higher data rate. In good reception conditions, the
receivers can receive both data streams; in poorer reception conditions, only
the "HP" portion.
Bx 4A
Priority:
high
INPUT
