User Manual

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• The Forward Power is shown about at the centre of the status bar. It is indicated in Watt. This is the power
as it is measured by the directional coupler at the very last stage of the power amplifier, just before the
output connector. When the RF is muted, the word MUTE is shown instead of the output power.
• The Reflected Power is shown next to the Forward Power. It is indicated in Watt. This is the power as it is
measured by the directional coupler at the very last stage of the power amplifier, just before the output
connector. When the RF is muted, the word MUTE is shown instead of the Reflected Power.
• The Temperature is shown at the rightmost side of the status bar. It is indicated in Centigrade degrees. This
temperature is measured by a sensor located near the hottest spot of the cooling heat sink of the power
amplifier stage. When a temperature alarm is present (the temperature is over the threshold), the tempera-
ture indication in the status bar blinks.
3.3.3 DIAGRAM SCREEN
The DIAGRAM screen represents a general schematic view of the ATSC TRANSMITTER. The most important
working settings are written using a small-size font. By looking at this diagram, the user can have a general
overview of the equipment status. On the left there is the input section, showing ASI1/ASI2 or SMPTE1/
SMPTE2 depending on the selection made in INPUTJCONFIGURATION menu. In ASI mode, the upper
ASI1 text appears when a valid ASI1 input stream is present. The lower ASI2 text appear when a valid ASI2
input stream is present. These words blink if a bad input stream is detected. The behaviour is identical in
SMPTE mode with a difference only in the strings: SMPTE1 and SMPTE2 instead of ASI1 and ASI2.
The presence of the string indicates only the presence of a corresponding input stream. The actual input
stream used by the modulator is shown by a horizontal line starting from the input name and entering the
modulator. Next to the input section, the modulator block is drawn. On top of the rectangle, the ATSC mode
is written: 8-VSB. The word MODUL blinks if any error associated to the modulator is present.
At the bottom of the modulator rectangle, there is the external reference block. If a valid reference is detected,
the REF rectangle is drawn. If the external reference is actually used by the modulator, a vertical line connect
the REF to the MODUL rectangles. If the user choose to use the external reference, but a good reference
can't be detected, the REF rectangle blinks. Immediately on the right, the up-converter block is drawn. On
top of the rectangle, the RF channel number is written if the frequency is chosen by standard/channel couple.
Nothing appears if the frequency is set manually. The triangle on the right represents the power amplifier and
an hypotetical antenna connected to it. From the output of the power amplifier, two lines start: they indicates
the output power and the reflected power measures shown in the status bar at the bottom of the display.
3.3.4 BROWSING THE MENUS AND PARAMETERS
The user can browse the menus, see the parameters values, change the settings of the machine and make all
the operations simply by using the knob located on the right of the display. The knob can be rotated left or
right and be pushed.