Dvb-T/H (Cofdm) Digital Channel Configuration - Promax TV EXPLORER HD User Manual

5.13.2 DVB-T/H (COFDM) Digital Channel Configuration

Measurements Configuration
Press the
CONFIGURATION
Select the signal
COFDM
modulation are described below:
Channel BW
1)
Enables the channel bandwidth to be selected between 6 MHz, 7 MHz and 8 MHz.
The selection of this parameter is essential for the correct operation of the tuner,
as it affects the frequency separation of the carriers.
Guard Interval
2)
Guard Interval
The
purpose is to permit a correct detection in multi-path situations. This parameter is
defined according to the symbol length:
turning the rotary selector
and then press it : a menu with the available values will appear. Turning the rotary
selector
Carriers
3) (Number of carriers)
It defines the number of modulation carriers between
value, place the marker over the
then press it: a menu will appear on the screen. Turning the rotary selector
select the desired value for the Carriers parameter and finally press it again to
validate.
Spectral Inv.
4)
This option enables spectral inversion to be applied to the input signal, though in
the majority of cases it should be in the OFF position (not inversion).
This configuration menu shows, besides the user definable
parameters, the value of the rest of signal parameters detected automatically:
Code Rate
Modulations
Page 44
menu and turn the rotary selector
DVB-T/H
, which uses
(channel bandwidth)
parameter corresponds to the dead time between symbols, its
[1], place the marker over the
[1] select the desired value and finally press it to validate.
(spectral inversion)
Also known as Viterbi ratio, defines the ratio between the data bits
number and the total number of bits transmitted (the difference
corresponds to the number of control bits for the error detection and
recovery).
Carriers modulation. It also defines the system noise immunity.
(QPSK, 16-QAM and 64-QAM).
USER'S MANUAL.
[17] key to access to the
COFDM
modulation. Parameters related to
1/4 1/8 1/16
, ,
Carriers
field by turning the rotary selector and
TV EXPLORER HD / HD
SIGNAL
[1] until the
1/32
, . To modify its value, by
Guard Interval
2k 4k 8k
, and . To modify its
COFDM
LE
option.
field
[1]
signal
10/2012