Televes COFDM-PAL CI Manual De Instrucciones página 42

User manual
c.- Modulator 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
Audio: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%
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
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 (Picts2) and video format.
MODULATOR
Aud.Lev: -2
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.
42
COFDM-PAL CI STEREO
key must
Audio input level (dBm)
and
keys.
Video to second audio subcarrier ratio: If
the audio carrier selects 5.5 MHz, an audio
subcarrier is generated in 5.74 MHz. The
level of this second carrier (in relation to the
video carrier) can be selected:
Video format: allows the selection of the
video mode for programs in 16:9 format.
Three possible modes are available:
7
5
3
1
0
-1
-2
-3
-4
-5
-7
-9
-13
-15
-18 dB -22 dB
-20 dB -24 dB