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Digital channel parameters:
a) Band width – channel bandwidth. Can be adjusted from 1000 to 8000 kHz with 125
kHz step;
b) COFDM – subcarriers modulation type. Available values: ------, QPSK, QAM16,
QAM64. The «------» symbol means modulation type different from DVB-T.
c) Spectrum – spectrum type: normal or inverted. Available values: norm, inv;
d) DVB bandwidth – DVB-T channel bandwidth. Available values: 6MHz, 7MHz,
8MHz;
e) Carriers – subcarriers number. Available values: 2k, 4k, 8k;
f) Guard interval – guard interval relative duration. Available values: 1/32, 1/16, 1/8,
1/4;
g) Hierarch mode – hierarchical modulation type (for QAM16 and QAM64 subcarriers
modulation only). Available values: ---, α α α α =1, α α α α =2, α α α α =4;
h) Code rate (HP) – high priority stream relative code rate. Available values: 1/2, 2/3,
3/4, 5/6, 7/8;
i) Code rate (LP) – high priority stream relative code rate (for hierarchion modulation
enabled only). Available values: 1/2, 2/3, 3/4, 5/6, 7/8.
The initial values of the parameters are set during automatic detection of a channel
plan and can be manually edited by means of the channel editing function.
When you create a new channel plan (Section 4.4.2.3) channel parameters are set
according the following rules:
a) For analog channels: frequency is set to video carrier frequency of the channel.
b) For digital channels frequency is set to central frequency of the channel. If the
Analyzer is synchronized on DVB-T signal, then the real channel central frequency
will be set. Channel bandwidth is set according to channel template (Section 4.7).
DVB-T channel parameters are detected automatically.
To fine tune a parameter, select it by
by ◄, ► keys.
To save the channel, press F2. To abort the function without saving changes, press F1
key. Always check all the parameters after the channel plan has been automatically set. It
is more convenient to determine the parameters in the spectrum measurement mode
using your PC and the control software. In case of incorrect (or non-optimal) settings, fine
tune the parameter manually. Otherwise, it can lead to errors in channel parameters
measurement.
NOTE! The Analyzer can only synchronize a DVB-T signal that has bandwidth, the
same as the channel in the channel template (Section 4.7). You can tune the DVB-T
channel bandwidth manually in the channel plan.
Pressing
key will confirm saving changes if any and exit the mode. You should
consider that when you save changes to or delete a channel plan, the data log pages,
which are related to the plan, becomes deleted.
To delete the selected channel, press F3 key.
4.4.2.2 Channel plan erasing
To erase a channel plan, select the required plan and press F2. The confirmation
request dialog will appear. To abort erasing, press F3. To confirm erasing of the plan,
press F1.
20
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keys, and then scroll to the required values
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