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7. Product description
7.1. Introduction
The HDTV TRANSMODULATOR - Dual 8PSK to
QAM allocates the information contained in two
independent satellite transponders (QPSK legacy,
Turbo QPSK or Turbo 8PSK modulations) in two
completely independent cable channels in the 57
to 999MHz range (Ch. 2 to 158).
The digital transmodulation process starts with the
demodulation of the input satellite transponders,
to obtain the MPEG2 transport streams which are
then remodulated into QAM format.
The output channel bandwidth will depend on the
useful bitrate of the satellite transponder and the
modulation selected for the QAM output.
The HDTV TRANSMODULATOR - Dual 8PSK to
QAM features two F-type satellite input connectors
labelled PORT1 and PORT2, allowing 3 input
configuration options (table 2):
• PORT1 routed to both tuners A and B (A loop-
through output is available in PORT2).
• PORT1 routed to tuners A and PORT2 to tuner B
(Two independent inputs).
• PORT2 routed to both tuners A and B (PORT1 is
not used).
The HDTV TRANSMODULATOR - Dual 8PSK to QAM
unit also features two output RF connectors, the
bottom one is the QAM output and the top one is
the QAM input (loop-through) that allows to mix
the output signal of previous modules installed in
the same subrack.
The universal Programming Unit (ref. 7234) is used
to program the operating parameters of the HDTV
TRANSMODULATOR - Dual 8PSK to QAM unit.
7.2. Front panel elements description
The next figure shows the location of all the ports,
status and alarm indicators, existing in the front on
the unit.
Side view
PORT1 and PORT2 are the satellite input
F-connectors (see table 2 for configuration
options). The input signal can be daisy-chained to
all the modules in a subrack, thus minimizing the
use of external splitters.
Connector 3 is the daisy chain QAM input from a
previous QAM output.
Connector 4 outputs the combined QAM output.
Loop-through losses are very low allowing to
combine the output of all the units in a subrack.
1. PORT1 – Satellite L-Band input
PORT1
2. PORT2 – Satellite L-Band input/output
PORT2
3. RF QAM input (loop-through input)
5
4. RF QAM output (loop-through output)
8
5. Power bus connectors
6
6. Control bus connectors
7. Computer/Programmer connector
9
10
8. Temperature status LED
11
7
9. SAT A input status LED
12
10. QAM A output status LED
11. SAT B input status LED
12. QAM B output status LED
Front view
13
EN
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