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5 Programming
The following examples show how the
PHDQ 4002 BC
Cassette is programmed;
the output channels can be set from S21 … S41. Set the other Cassettes listed
in the same way.
5.1 Preparation
Notes:
Using the menu
“
LEVEL CONTROL
”
the Cassette generates an equally powerful
HF carrier on the video carrier frequency of the channel. In this way, the Cas-
sette‘s level can also be set with an analogue TV test receiver set to the video
carrier frequency of the channel. In order to prevent interference within the
head end and the cable system, the output level of the digital Cassettes must
be lowered by approx. 10 dB at 64 QAM and by approx. 4 dB at 256 QAM
compared to analogue Cassettes.
• Connect the test receiver to the “TEST OUTPUT” 1 of the
head end.
• Set the output channel of the Cassette (see page 14) and
adjust the TV test receiver to this channel.
• Switch on the modulator if necessary.
• Measure the output level of the analogue Cassettes and, if
necessary, tune them to a uniform output level.
•
Check the output level of the digital DVB-MTP Cassettes.
Lower the output level of the appropriate Cassette in re-
lation to the analogue Cassettes at 64 QAM by approx.
10 dB and at 256 QAM by approx. 4 dB with the level
adjuster to the right of the Cassette.
•
After programming the Cassette check the output level of
the Cassette again and if necessary set it again.
.
+24
BREITBA
L100
L101
L103
C100
LNC-
+18V
ROT
+18V
Anschl.
GRUEN
CASSETTE
CASSETTE
CASSETTE
1
+24
BREITBA
L100
L101
L103
C100
LNC-
+18V
ROT
+18V
Anschl.
GRUEN
CASSETTE
CASSETTE
CASSETTE
1