GSS HDMT 1000 MPTS Assembly Instructions Manual page 30

• Use
• Press the
h
i e r a rC h i C a l
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
C30
!
for fine tuning the input channel ("-64" ... "+64").
0
9
—> In addition to the indicator in the display, there is also a status LED
8
which indicates whether a transport stream is received or not:
7
6
5
4
3
2
1
button.
—> The menu "Hierarchical modulation" – "INPUT Priority:" is activated.
m o d u l at i o n
Bx 4A
Priority:
INPUT
0 OK
2
Status LED of channel strip "B"
5
Status LED of channel strip "A"
LED indicator
Green
Red
INPUT
high
- 30 -
-64...+64
Indication
Signal available
No signal
HDMT 1000 MPTS