PT 5780 DVB-T Modulator
ProTelevision Technologies
Operating Instructions
Instruction Manual
Revision 3.11
4-15
MFN/SFN (ID 1300)
The menu allows selection of the network mode to be applied for the transmission; Multi
Frequency Network – MFN or Single Frequency Network – SFN.
Note: The menu is only
accessible when the SFN option PT 8732 is installed.
4.3.4.4
SIGNAL Menu System (Menu ID 2000)
The signal menu system (menu ID 2000) is accessed by pressing the [EXECUTE] button
followed by the [RIGHT ARROW] button as described in paragraph 4.3.4.1. When the menu
system is entered at menu TRANSMISSION use the [RIGHT ARROW] button to navigate to the
SIGNAL menu.
INPUT menu (ID 2100)
This menu allows the user to select the input source(s) and to set the status of the auto
substitution function.
In the non-hierarchical configuration the input menu (ID 2120) allows the user to assign a
primary input source and a secondary input source. The instrument offers as standard a choice
between two input sources (ASI input “A” and ASI input “B” corresponding to the BNC input
sockets located in the rear panel of the modulator). Additional input sources such as two more
ASI inputs (input “C” and “D” ) or an SPI LVDS input are available as options (When installed
the SPI LVDS input is identified as input “C”).
For non-hierarchical applications the user will typically program input ”A” as the “primary” and
input “B” as the “secondary” input source. Should the “primary” signal source fail in this
configuration the instrument will automatically switch over to the “secondary” input if the Auto
substitution function is set to “ON” (requires that a valid MPEG-2 transport stream is applied to
the “secondary” input).
For hierarchical applications the user will typically assign input “A” as primary source for the
High Priority input (Menu ID 2120) and assign input “B” as primary source for the Low Priority
input (menu ID 2130). If the option that provides two additional ASI inputs is installed (Input “C”
and “D”) the user may choose to program Input C as secondary input source for the High
Priority input (menu ID 2120) and to program Input D as secondary input source for the Low
Priority input (menu ID 2120) if it desired to add redundancy by means of the Auto Substitution
function. That is, when the auto substitute function is set to “ON” the unit will automatically
switch to the secondary input source if the primary input source fails (requires that a valid
MPEG-2 transport stream is applied to the “secondary” input).
OUTPUT (ID 2000)
This menu allows the user to set a range of parameters that affect the generated COFDM
spectrum. Sub menus are available for setting (centre) frequency, bandwidth, level, sideband
filter (window) function, spectrum polarity, and local transmission delay (SFN only).
A sub menu (menu ID 2210) allows the user to set the
output frequency
. The IF version allows
setting of the frequency in the range between 35-37MHz. The RF version covers the range from
30MHz to 1000MHz.
Note: In case of the RF version (option PT 8715 installed) the IF output is
fixed to 36MHz.
The RF version allows furthermore the user to set the output frequency by
channel number (menu ID 2220). The applicable channel raster is programmable via the
channel set-up menu (menu ID 2230). The channel set-up menu offers selection between a
Содержание PT 5780
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