Setup Manual

Device View Description
R&S
®
Tx9
163Operating Manual 2109.9110.02 ─ 07
"Linear" parameters
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Path:Device View (Home) > Transmitter > Exciter > Pre-Correction > Linear
Name Description Value range Access right
Adaptive Precor-
rection (Settings)
The linear precorrector is used to compensate output filter faults. The
quality of precorrection affects the amplitude and group delay ripple of
the output signal.
The setting can be changed here.
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Bypass
The linear precorrector is deactivated. The signal is not modified
inside the exciter.
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Stop
Adaptive precorrection is deactivated. The correction curve that
was determined last is active inside the exciter.
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Run
Digital TV standards only: The adaptive precorrector is active.
The best possible precorrection curve to compensate for ampli-
tude and group delay errors caused by the output filter is deter-
mined continuously.
Analog TV standards only: The automatic precorrector is active.
The best possible precorrection curve to compensate for ampli-
tude and group delay errors caused by the output filter is deter-
mined once. The precorrector then enters "Stop" mode. The pro-
gram is interrupted during precorrection.
In certain situations, it may be advisable to have a suitable precorrec-
tion curve determined automatically first and then to switch adaptive
precorrection to "Stop" so that the found precorrection curve can no
longer change.
Bypass, Stop,
Run
Maintenance
Status (Settings) Indicates the status of the linear precorrector.
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Idle
The precorrector is not active.
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Acquisition
The precorrector is currently recording new measurement values.
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Calculation
The precorrector is currently calculating a new precorrection
curve.
Idle, Acquisition,
Calculation
Read Only
Input Level (Set-
tings)
Indicates whether the level of the input signal is sufficient. "No Input"
appears if the transmitter is off.
OK, Too Low,
Too High, No
Input
Read Only
Slope (Settings) Indicates the asymmetry compensation caused by the RF cable used
between the RF test point downstream of the output filter and the input
of the linear precorrector.
The setting can be changed here.
-1 dB to 1 dB Maintenance
Reset (Settings) Resets the precorrection. If the precorrector is in "run" mode, a new
precorrection curve is calculated.
Maintenance
Amplitude Ripple
Limit (Amplitude
Ripple Limiter)
Indicates the desired maximum amplitude ripple at the output of the fil-
ter. If the circuit for automatic switchover is switched on, the precorrec-
tor attempts to modify the signal to such an extent that the amplitude
ripple remains below the specified limit.
The setting can be changed here.
0 dB to 2 dB Maintenance
Exciter ATSC