USER’S MANUAL. TV EXPLORER II/II+
12/2013
Page
45
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This configuration menu shows, besides the
QPSK/8PSK
signal parameters
selected by user, all the values automatically detected:
Roll Off
Nyquist filter roll-off factor.
Pilots
(Only in DVB-S2) Pilots detection in transmission.
IMPORTANT REMARK
DVB channels tuning may require an adjusting process. It is recommended to follow
next procedure:
1.
From the
spectrum analyser
mode
[13],
tune the channel at its central
frequency.
2.
Switch to
Measurements mode
[12]
, measurement selection.
3.
If in the lower line of the screen does not appear
MPEG-2
message (and
consequently BER is unacceptable), by turning the rotary selector deviate the
tuning frequency until
MPEG-2
message appears. Finally tune channel again
to minimize the
frequency deviation which optimizes the BER
and therefore
minimize the BER.
If it is not possible to detect any MPEG-2 channel, make sure that digital signal
parameters are correctly defined.
5.14
Selecting the Measurements
The types of measurements available depend on the operating band (terrestrial or
satellite) and the type of signals (analogue or digital).
Terrestrial band - Analogue channels:
Level
Level measurement of the currently tuned carrier.
Video / Audio
Video carrier to audio carrier ratio.
C/N
Ratio between the modulated signal power and the equivalent
noise power for a same bandwidth. (according to TV standard)
FM Deviation
Measure the frequency peak deviation for any modulated
analogue carrier in
FM
.
