Chapter 10 437
Analyzer Options and Block Diagrams
Option 190 DVB-C Service Menus
Menu 3 of 3
COUPLING ON OFF (when set to OFF) allows you to disable the
automatic selection of channel bandwidth when a new channel is
entered. This may be used if you want to ignore the FTZ `D' channel
layout while using `D' channels.
RETUNE ON OFF (when set to OFF) allows you to disable the automatic
re-setting of the 71.1 MHz oscillator that is done when a demod-based
measurement signal acquisition fails. This can be set to off to
investigate signal acquisition for a fixed 71.1 MHz tuning state (lower,
centered or upper).
ACQ MER LIMIT allows entry of values from 0 to 50 dB (the default is
20 dB). This value is used during a demod-based measurement
signal-acquisition routine. If the measured value of MER is less than
this limit and the
MER LMT ON OFF key in the Demod Setup menu is ON,
the acquisition routine will abort with a MER TOO LOW message.
MEAS MER LIMIT allows entry of values from 0 to 50 dB (the default is
20 dB). This value is used during a demod-based measurement. If the
measured value of MER is less than this limit and the MER LMT ON
OFF key in the Demod Setup menu is ON, the measurement will abort
with a MER TOO LOW message.
NOTE Setting MER LMT ON OFF in the Demod Setup menu to OFF will ignore
both “ACQ” and “MEAS” MER limits. This is essentially a shortcut to
setting both ACQ and MEAS MER limits to 0 dB to allow acquisition
and measurement of very noisy signals.
IGNOR BW ON OFF is used to disable the automatic channel bandwidth
verification that is done at the start of single signal demod based
measurements. If this key is set to ON, the signal's (approximate)
measured occupied bandwidth is not compared against the setting of
the
CHAN BW SELECT key.
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