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4 ==> 1/4
8 ==> 1/8
1 ==> 1/16
3 ==> 1/32
- The digit that can be found furthest to the
right indicates the Viterbi code rate, using
the following table:
1 ==> 1/2
2 ==> 2/3
3 ==> 3/4
5 ==> 5/6
7 ==> 7/8
For example:
This indicates 8K carriers, a constellation
64QAM, guard interval 1/4 and Viterbi rate
2/3.
When the demodulator is not locked, the
following will appear: "0.0.0.0".
Since this is only a reading menu, neither
the
, nor the
, and
buttons are in
use.
d.- Input level
By pressing the
button, you access the
input level indication menu. Since this is
only a reading menu, neither the
, and
buttons are in use.
Input level high
Input level OK
Input level low
e.- Modulation format
By pressing the
button, the modulation
format menu appears:
To modify the modulation format, press the
or
buttons until you obtain the value
that you want (16, 32, 64, 128, 256).
If the modulation format selected gives a
QAM symbol rate greater than 7.2 Mbaud,
the modulation format menu will blink on
and off, indicating that the format that has
been selected is incorrect and one greater
should be chosen.
35
f.- Output channel / frequency
If the
button is pressed, the following
menu appears. This is the output channel,
for example channel 5:
, nor the
In this case, only the
select the desired channel. The range allo-
wed is form 2 to 99.
Output channel can also be shown in fre-
quency mode in steps of 250 KHz (see
extended menus). For example 834.25 MHz:
The button
allows to select a digit in the
display which is modified using the
buttons.
COFDM-QAM
and
buttons
and
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