Televes COFDM-PAL Manuel D'utilisation page 49

User manual
6.2.- MENU EXTENDIDO
a.- Menú modulador 1
This menu shows the following parameters
of the output modulation: video modulation
depth (VMD) and video to audio carrier ratio
and subcarrier ratio frequency.
The possible values for the video modulation
depht are:
68.5%
72%
75.5%
77%
79%
80%
81%
82.5%
For the carriers ratio the possible values are
between -11 to -15 dB.
For audio subcarrier frequency the possible
values that are selected 4.5, 5.5, 6.0 and 6.5.
To carry out a modification the
be pressed until the selected parameter flas-
hes. Then the correspondent parameter can
be modified by pressing the and
b.- Modulator menu 2
This menu shows the following parameters:
audio level and video format.
Audio level:
the value displayed indicates the necessary
audio input level to get a deviation of
±50KHz considering an input signal of
1KHz. This means that -17dBm will generate
a greater audio level 4 dBm.
49
key must
Audio input level (dBm)
keys.
-2 (1.7Vpp aprox)
Video format:
the video format allows the selection of the
video mode for programs in 16:9 format.
Three possible modes are available:
- Pan & Scan: Wide screen is scanned
and panned left and right to give a full
screen picture.
- Letterbox: Picture with black bars on
top and bottom of picture.
- Full Screen: The picture adapts to the
whole screen but its contents are
deformed.
COFDM-PAL
4
1
1
-1
-3
-4.5
-5.5
-6
-8
-9.5
-11
-15
-17