PT 5780 DVB-T Modulator
ProTelevision Technologies
Operating Instructions
Instruction Manual
Revision 3.11
4-9
optional delay value. The modulator does not implement the frequency offset and the absolute
power value but both values can be extracted via the modulator remote control (SCPI/RS232)
for use by the transmitter control system if desired.
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Optional Delay Time:-30.0 ìs
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Freq:400 Hz Power:10.0 dBm c3
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Status Window ‘d1’ – The Output Status Window
This status window displays the IF/RF (dependent on whether the RF converter is installed and
enabled for use) output frequency, the output bandwidth and the output level. The output level is
displayed in dB relative to nominal level.
If the RF converter is not installed, the following window is displayed:
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OUT IF-Freq:36,000,000 Hz (8MHz)
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Level:0.0 dB d1
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note: Nominal IF level is +6dBm
If the RF converter is installed and enabled, the following window is displayed:
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OUT RF-Freq:1,000,000,000 Hz(8MHz)
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Level: 0.0 dB d1
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note: Nominal IF level is 0dBm
Status Window ‘d2’ – The Pre-Corrector Status Window
This window is only available if the pre-corrector option PT 8731 is installed. On the first line of
the window, the display shows whether the non-linear and linear pre-correction functions are
currently in operation. On the second line the origin of the employed pre-correction curves is
indicated. The pre-correction curves can be loaded from the preset bank (in this case the
number and name of the preset is indicated). Alternatively, the curves originate from the default
pre-corrector curve bank (in this case the display will indicate: “No saved Pre-correction curve
loaded”. The default pre-corrector curve bank contains the curve that can be manipulated by
means of the IMD Buster PC software that is supplied together with the pre-corrector option.
The IMD Buster software allows transfer of the curve from the default curve bank to one of the
curve pre-set bank.
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PRE-CORRECTOR NLC: ON, LC: ON
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NLC:#1/2001-0-20T;LC:#7/2001-0-20R d2
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PRE-CORRECTOR NLC: ON, LC: OFF
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No saved pre-correction curve loaded d2
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Note that the second line display is evenly split between the names of the non-linear and linear
pre-correction curves.
Summary of Contents for PT 5780
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