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User manual
COFDM-PAL CI STEREO
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.
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.
MODULATOR>>
VMD: 72.5%
Picts 1: -12
Audio:5.5MHz
To carry out a modification the
key must
be pressed until the selected parameter flas-
hes. Then the correspondent parameter can
be modified by pressing the
and
keys.
d.- Modulator menu 2
This menu shows the following parameters:
audio level, video to second audio subca-
rrier ratio (Picts2) 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 -15 dBm
will generate a greater audio level than 7
dBm.
MODULATOR
Aud.Lev: -2
Picts 2: -11
Letterbox
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:
-18 dB
-22 dB
-20 dB
-24 dB
Video format:
allows the selection of the
video mode for programs in 16:9 format.
Three possible modes are available:
Audio input level (dBm)
7
5
3
1
0
-1
-2
-3
-4
-5
-7
-9
-13
-15
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