acceptable reception being around 10
-2
.
Once here, the main parameters of the
QPSK-PAL module have been configured.
By pressing the
button for approximately
3 seconds, it is possible to have access to a
series of options that are less frequently
used and that are called the Extended
Menu.
5.2.- Extended Menu
a.- Device address
The first option that appears in the extended
menus is the selection of the device’s
address. For a headend to be remote
controlled, as explained in section 7, each
controllable element must have a unique
address.
It is necessary to make sure that there
aren't any repeated addresses in the
control bus.
The
buttons lets us select the digit that
we want to modify, increasing or decreasing
the value using the
or
buttons. The
addreses available are from 1 ... 254, for
example, the address number 34:
audio channel
is displayed, for example,
channel 1:
It is possible to select the desired audio
channel between those available in this
service using the
and
buttons. If this
service doesn't dispose of an audio channel,
this will be shown on the display:
The change is carried out in the same way
and takes place immediately but is not
saved.
g.- CBER
By pressing the
button, the
CBER
reading or the bit error rate before Viterbi is
displayed. Since this is only a reading menu,
neither the
button, nor the
and
buttons are in use. The first three digits
correspond to the mantis and the third
corresponds to the exponent. For example:
This indicates an error rate of 2.5 x 10
-4
. A
signal with a typical C/N of around 12 dB
should correspond to an error measurement
of approximately 10
-4
, the minimum for an
corresponds to the tens and if the
button
is pressed again, the display will change and
the cursor will move to the digit which
corresponds to the units. For example, if
there is a baud rate of 14,357 Mbauds the
following will appear on the display:
e.- Program number
By pressing the
button, it is possible to
have access to the
program
selection, for
example program 5:
The
and
buttons allow us to select the
desired program between 1 and the number
of programs available in the
multiplex
. This
change takes place immediately but it is not
saved, so that when 30 seconds have
elapsed, the last program that was saved
will be retrieved. When a program is selec-
ted, the name of the program appears on
the screen for a few seconds followed by
the # symbol if the channel is encoded.
f.- Audio channel
By pressing the
button, the selected
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User manual
QPSK-PAL
ENGLISH
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