CW-4142 QPSK DEMODULATOR
Dear User!
The CW-4142 QPSK DEMODULATOR is a new
member of CableWorld’s digital satellite receiver
family. This instrument provides two more essential
features as compared to the earlier ones:
•
it can accommodate a Conditional Access Module
(CAM), thus provide reception of scrambled
programs,
•
it is equipped with Asynchron Serial Interface
(ASI) which permits the transport stream to be
accessed directly.
Prior to take into operation the unit please read
through this User’s Guide carefully.
1.
Mechanical construction
The
CW-4142 QPSK DEMODULATOR
is accom-
modated in a standard 1 unit high 19" rack frame.
The unit is delivered along with the following
accessories:
1. Fuse
T0.4 A (slow)
1 ea.
2. Power cord
1 ea.
When mounted in rack cabinet, place the
CW-4142
QPSK DEMODULATOR
above
the relevant
TV
MODULATOR
. These both units together form a
channel processing assembly. The channel
processing assemblies have to be separated from
each other with CW-3004 VENTED COVER
PLATEs, to provide sufficient ventilation.
2. Electrical construction
The
CW-4142 QPSK DEMODULATOR
equipped
with proper CA module and valid SmartCard
(subscriber card) demodulates the input QPSK
modulated satellite IF signal (920-2150 MHz) and
delivers the complete transport stream, which
includes those channels having been processed by
the Conditional Access Module in descrambled
form.
Beyond this, one selected program of the TS (FTA
or descrambled) will be MPEG-2 decoded and after
digital/analogue conversion is delivered as base
band video and sound signal.
The input and output connectors are arranged in
the unit's rear panel:
2 × "F" type sockets QPSK SAT IF input and
loop-through output
1 × BNC socket
video output
1 × BNC socket
ASI output
2 × RCA sockets
stereo sound channel outputs
2 × RJ12 sockets
CW-Bus
All connections have to be made with high quality,
low attenuation cables. Such cables and cable sets
are available in CableWorld’s product range.
The
CW-4142 QPSK DEMODULATOR
is com-
posed of following subunits:
-
QPSK demodulator and error correction circuitry,
-
Common Interface circuitry with standard PCMCIA
socket accessible form the front panel,
-
MPEG-2 video and audio decoder and
-
microprocessor-based control unit.
The instrument incorporates an own switched mode
power supply. This power supply is accommodated in
the right side of the unit, under a shielding cover and
it delivers all necessary supply voltages.
The mains switch and fuse are located on the unit's
rear panel. The fuse is accessible after unscrewing
the fuse holder.
The switched-on state of the demodulator is
indicated by a yellow LED on the front panel.
The required reception parameters can be set with 8
front panel buttons. The operation modes are
indicated with LEDs and the actual parameter values
in a 2×20 character LCD display, on the front panel.
The LCD display is equipped with own back lighting.
Without pushing any of the buttons for more than 30
minutes, the back lighting turns down automatically,
and turns on again on pushing any of the buttons or
inserting or removing the CAM or the SmartCard.
3. General information
After switching on the demodulator,
INITIALIZING...
appears in the display, followed by
SELECT MENU
.
Use the
MENU
button to choose the
Normal
, or
the
Extended
menu.
As basic setting, the control unit calls the normal
menu, which includes only those menu items
necessary to set the reception parameters. The
extended menu delivers additional information
about several internal parameters and permits to
set some rarely used functions. The extended
menu can be used to locate errors, too.
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