Promax US TV EXPLORER II, User Manual

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USER’S MANUAL. US TV EXPLORER II
Page 44 01/2008
FREQ:
CH:
C/N:
POWER:
MER:
SER:
VBER:
»
>21.3
55.8
19.5
dB
dBµV
dB MHz
kHz
57.00
-3
A02
10 30 50 70 90 110 130
1.0E-5
1.0E-8
MPEG-2
CONFIGURATION
» CHANNEL SET:
S :
:
:
» SPECTRAL INV:
EXIT
» SIGNALL:
YSTEM
FRAME RATE
CHANNEL BW
FCC
NTSC
60Hz
6.00MHz
OFF
8-VSB
Figure 21.- Screen of measurements configuration ( 8-VSB signals).
5.13.4 DVB-S/S2 (QPSK/8PSK) Digital Channel Configuration
Press the Measurements Configuration [17] key to access to the
CONFIGURATION menu and turn the rotary selector [1] to access the QPSK/8PSK
signals parameters which can be defined by user and are described below:
1)
Channel BW (channel bandwidth)
Enables the channel bandwidth to be selected over a range from 1.3 MHz to
60.75 MHz. The selection of this parameter is essential for the correct operation
of the tuner, as it affects the frequency separation of the carriers.
2)
Spectral Inv
If necessary, activate the Spectral inversion ( On ). Reception will be bad if
spectral inversion has been incorrectly selected.
3)
Code Rate
Also known as Viterbi ratio. It defines the ratio between the number of data bits
and actual transmission bits (the difference corresponds to the control bits for
error detection and correction).
In
DVB-S it permits to choose between 1/2 , 2/3 , 3/4 , 5/6 and 7/8 . In DVB-S2 it
permits to choose one of the following values: 1/4 , 1/3 , 2/5 , 1/2 , 3/5 , 2/3 , 3/4 , 4/5 ,
5/6 , 8/9 y 9/10 .
4)
Symbol Rate
It is possible to choose over the following values: from 1000 to 45000 kbauds.
When selecting the option appears the current value, in order to modify it enter a
new value through keyboard when appears the data enter symbol appears on the
upper left corner screen.