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Programming the MCP-400 Modulators
Programming the MCP-400 Modulators
Programming the MCP-400 Modulators
Programming the MCP-400 Modulators
2. THE SETTING SCREENS
2.1 - The RF Screen
This screen appears when you select the
RF
option in the
Settings
Menu. It contains
two pages. Through these pages the different parameters and selection options are
displayed (the scroll arrows
▲
and
▼
at the lower line warn that you are in a page).
Remember that the change of page is accomplished by the keys
↑
or
↓
.
When the option is selected the first page appears:
1
!
Sys: D/K
2
Ch: 21
→
471.25MHz
DONE
" !
SEL
●
"Ch" : If you select this option, a Channel Selection screen appears. This screen
allows to do the frequency selection in a quickly and secure way through two pick
lists, "TV System" and "TV Channel", which are displayed by using the SEL
command (key ). Through these lists you select the TV system and the TV
channel.
●
"Frequency" : Is the video carrier of the output TV channel, in MHz. There is a
numerical field where you can enter the number either by any one of the ways that
were described in paragraph 1.3 of the Basic Handling guide (Entering Data, page
9), or using the third option, "Ch", which is explained below.
●
"Offset" : Is a special adjustment for USA (System M, IRC Frequency Plan). It
allows to apply a positive increment of 12.5 or 25 kHz to the value in MHz that
appears in the "Frequency" upper line at the present screen. To apply the offset,
open the pick list by using the SEL command (key ) and then select one of the
available values: 0, +12.5 or +25 kHz.
Use the DONE command (left lower corner, key ) to validate the selection, or
the CANCEL command to not validate. The screen closes and the above first
page appears again (it will show the new value of Frequency, if this is has been
changed)..
1
!
Frequency :
687.25
2
Offset :
-------
3
Ch:
SEND
" !
$
SEL
Press the key
↓
to reach the second page of the
RF
screen, where you can do the
following selections :
●
"Attenuation" : Is the attenuation for the RF level of the TV channel output signal.
Setting is carried out in real time through a slide icon: when you move the slide,
the new value of the attenuation is instantaneously established in the module, that
is to say, you have not to use the SEND command. To state exactly the setting
value for the RF level you must use a spectrum analyzer or a field strength meter.
4
Attenua:
%%%
"
%%%%%%%%
5
!
CaRatio :
12dB
6
2ndIntercar.:
6.742
SEND
" !
$ &
SEL
●
"2nd Sound Intercarrier" : If the modulator is going to operate in stereo or dual
mode, this line is merely informative about the frequency of the 2nd sound
intercarrier except for D/K A2 system, in which case one must choose one of the
three values through the pick list that is open when using the SEL command (key
). The following table shows the standard frequencies of the 2nd sound
intercarrier :
If the modulator is Nicam type, press the key
↓
. The third page of the
RF
screen
appears. Here you can set the level of the Nicam carrier :
TV System
B/G - A2
D/K - A2
B/G/D/K/L - Nicam
I - Nicam
2nd Intercarrier Frequency (MHz)
5.742
5.742 / 6.258 / 6.742
5.85
6.552
2.2 - The Video Screen
This screen appears when you select the
Video
option in the
Settings
menu. It
contains information, selection and setting parameters:
1
!
TV System
:
D/K
2
Test
:
X
3
MoDepth
:
%%%%%%%
"
%%%%
SEND
" !
SEL
●
"TV System" : If the modulator is B/G or M/N, this line is merely informative about
the TV system of the output TV channel. If the modulator is D/K or D/KI/L, use the
SEL command (key ) to display a pick list where you must select D/K, I or L.
●
"Test" : This option is activated and disactivated by placing the slide on the line
and then using the SEL command. When you active this option, the modulator
generates a test pattern signal.
Besides the main test functionality, the generation of a video signal makes easier to
incorporate "only audio" channels within a general system of TV programs distribution.
(Warning: the channels will be "mono" sound, despite stereo sources are at your
disposal and stereo/dual modulators are being used).
●
"Modulation Depth" : Is the modulation depth of the TV channel output signal. The
adjustment will be merely visual from a TV set. It is also carried out through a slide
icon.
●
"NICAM level" : This adjustment refers to the level of the Nicam carrier. Standard
ratio between the levels of the video and Nicam carriers is 20 dB for systems B,
G, I, and 27 dB for systems D, K, L. Factory set value is 20 dB, and to modify it
you must move the slide with the keys
←
and
→
. Adjustment operates in real
time and to state a very value you must use a spectrum analyzer.
7
NICAMlv:
%%%
"
%%%%%%%%
SEND
" !
&
SEL
2.3 - The Audio Screen
This screen appears when you select the
Audio
option in the
Settings
menu. It allows
to select the operation mode and to set the modulation indexes.
1
!
AudMode :
Stereo
2
Audio1 :
%%%
"
%%%%%%%%
3
Audio2 :
%%%%%%%
"
%%%%
SEND
" !
SEL
●
"Audio Mode" : Is the audio function of the modulator.
a) THE CONNECTED MODULE IS A "MONO" MODULATOR:
The line is merely informative: the mode cannot be other than Mono.
NOTE: Remember that you can use a stereo source with a "mono" modulator. The L and R
signals are summed by the modulator itself.
b) THE CONNECTED MODULE IS AN "A2" or "NICAM" MODULATOR:
Display a pick list by using the SEL command (key ), and then select the
desired audio mode:
- STEREO : In this operation mode, the adjustments of the Audio 1 and Audio
2 modulation indexes (which are carried out on the second and third lines of
the screen) are not independents but they vary in unison.
- DUAL : In this operation mode, the Audio 1 signal (the signal modulating the
first audio carrier, and also the sound 1 in Nicam system) is the one that is
present at the L connector, and the Audio 2 signal (the signal modulating the
second audio carrier in A2 system, or the sound 2 in Nicam system) is the
one that is present at the R connector. The adjustments of the Audio 1 and
Audio 2 modulation indexes (second and third lines on the screen) are
independent.
- MONO : In this operation mode, the Audio 1 signal (the signal modulating
the first audio carrier) is the signal that is present at the audio input L
connector —the R connector is inoperative—. The Audio 2 option (third line
on the screen) is not available for this mode.
●
"Audio 1" : Is the audio modulation index of the first audio carrier (the unique audio
carrier, in the case of "mono" sound), and also the amplitude of the sound 1 in
Nicam system. The adjustment must be eminently auditory from a TV set and is
carried out in real time through a slide icon.
●
"Audio 2" : Is the audio modulation index of the second audio carrier in A2 system,
or the amplitude of the sound 2 in Nicam system. The adjustment process is like
for Audio 1.
●
"Carrier Level Ratio" : Is the ratio between the levels of the video and audio
carriers (first audio carrier in A2 or Nicam modulators). Use the SEL command
(key ) to open a pick list that presents two options: 12dB and 16dB. Place the
slide on the desired option and press .
In A2 modulators, the level of the 2nd audio carrier is -20 dB (unmodifiable).
