Televes QPSK-PAL CI Manual De Instrucciones página 45

User manual
c.- Modulador menu 1
This menu shows the following parameters
of the output modulation: video modulation
depth (VMD), video to audio carrier ratio and
subcarrier ratio frequency in MHz.
MODULATOR > >
VMD:72.5%
Picts 1:-12
Sound:5.5MHz
Video modulation: the possible values for
the video modulation depht are:
1: 68.5% 5: 79.0%
2: 72.0% 6: 80.0%
3: 75.5% 7: 81.0%
4: 77.0% 8: 82.5%
Video to audio carrier ratio: there are 8
possible values between -11 and -18 dB.
Subcarrier ratio frequency: for audio sub-
carrier frequency the possible values that
are selected 4.5, 5.5 , 6.0 and 6.5 MHz.
When the selected carrier is 5.5MHz, the
output will be stereo and 2 carriers are
generated.
For the other configurations the output is
mono and one audio carrier is generated.
To carry out a modification the
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be pressed until the selected parameter flas-
hes. Then the correspondent parameter can
be modified by pressing the
d.- Modulator menu 2
This menu shows the following parameters:
audio level, video to second audio subca-
rrier ratio (Picts 2) and video format.
MODULATOR
S.Dev. : 5
Picts 2: -11
Letterbox
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 -15 dBm
will generate a greater audio level than 7
dBm.
Video to second audio subcarrier ratio:
allows the selection of the audio carrier level
related to the video carrier the possible
values are:
-18dB
-20dB
key must
and keys.
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
- Letterbox: Picture with black bars on
-22dB
-24dB
45
STEREO QPSK-PAL CI
Audio input level
(dBm)
7
5
3
1
0
-1
-2
-3
-4
-5
-7
-9
-13
-15
and panned left and right to give a fulll
screen picture
top and bottom of picture.