WISI
COMPACT LINE
Operating instructions
© WISI Communications GmbH & Co. KG
-24-
VX 52 B / VX 53 B series
RF amplifier - single output stage
4.4.3 Auto-Alignment
Principle and sequence of the auto-alignment process.
The auto-alignment functionality allows for a quick and easy, error-free optimum level
adjustment of the VX amplifier chain.
Follow these steps in order to execute the auto-alignment:
1. Make sure that the
ALSC mode
is set to „off“.
2. Set the
slope pivot frequency
according to your channel lineup.
3. Choose two reference channels (pilots) from your RF channel lineup and set the
pilot frequency
and the
pilot modulation format
accordingly. If possible, select
two frequencies far apart from each other.
4. Enter the
target downstream level
and the
target downstream slope
which
you want the amplifier output to provide.
5. In order to have the auto-alignment estimate the transmission loss of the incoming
cable span, enter the
previous downstream level
and
previous downstream
slope
. This estimation will be used for the automatic upstream alignment.
6. Now you can
start the auto-alignment
. In case of wrongly plugged modules or
severe level deviations there will be a notification.
ALSC mode
BT App:
ALSC > ALSC-Mode >
[ALSC off] / [one pilot] /
[two pilots]
Handset: ALSC-Unit > ALSC Mode >
Slope pivot frequency
BT app:
DOWNSTREAM > Input Equalizer > Frequency Mode > [1006 MHz] /
[1218 MHz]
Handset: Downstream > BorderFreq >
