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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
Video / Audio
C/N
FM Deviation
Terrestrial band - Digital channels (DVB-C
Channel power
C/N
MER
CBER
VBER
Satellite band - Analogue channels
Level
C/N
Page 48
USER'S MANUAL.
Level measurement of the currently tuned carrier.
Video carrier to audio carrier ratio.
Ratio between the modulated signal power and the equivalent
noise power for a same bandwidth. (according to TV standard)
Measure the frequency peak deviation for any modulated
FM
analogue carrier in
.
and
Channel power is measured assuming that power spectral
density is uniform throughout channel bandwidth.
To measure it correctly it is indispensable to define the
Channel BW
.
Out-channel measurement. Noise level is measured at f noise =
f tuning ½*Channel BW. To measure it correctly digital channel
must be tuned at its central frequency.
Modulation error ratio with noise margin indication.
BER
measurement (Bit error rate) for the digital signal before
BER before FEC
error correction (
BER
measurement (Bit error rate) for the digital signal after error
BER after Viterbi
correction (
Level measurement of the currently tuned carrier.
Ratio between the modulated signal power and the equivalent
noise power for a same bandwidth.
TV EXPLORER HD / HD
DVB-T/H)
:
).
).
LE
10/2012
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