GSS PHDT 1000 H, Assembly Instruction Manual

Page: 16 / 48

- 16 - PHDT 1000 H
5 P
rogramming
5.1 P
rePar ation
• Connect the test receiver to the RF output or the test output of the head-end
station.
• Set the output channel / output frequency of the cassette (see page 26) and
adjust the TV test receiver to this channel.
• Switch on the channel strip (modulator) if necessary (see page 28). For each
channel strip, there is a status LED which indicates if the channel strip is
switched on.
Status LED
Channel strip
"B"
Status LED
Channel strip
"A"
• Balance the output levels of the channel strips " A " and " B " if the difference
in level is ≥ 1 dB (page 28).
5.2 n
otes on level set ting
In order to prevent interference within the head-end station and the cable sys-
tem, the output level of the cassette must be decreased by 10 dB compared to
analogue cassettes at 64 QAM, and by 4 dB compared to analogue cassettes
at 256 QAM.
• Measure the output levels of the other cassettes and tune them to a uniform
output level using the appropriate level controls or software dependent on
the head-end station used. Please regard the assembly instructions of the
respective head-end station.