Televes T.0X 565301 User Manual page 20

HDTV TRANSMODULATOR - Dual ATSC/QAM to QAM
• TUNER A •
SELECT OUT
MODULATION
256 QAM (A)
If the QAM order selected is not able to
accommodate the data rate of the input signal,
it will cause an overflow condition. This will be
indicated on the display with a "QAM OVF !!"
alert message alternating with the selected QAM
modulation. The correspondig QAM LED will blink
in orange in the front of the unit.
• TUNER A -
SELECT OUT
MODULATION
QAM OVF!!
Output interleaving selection
The user can select the interleaving format. This
menu is only available when the output QAM
format selected is annex B, as the interleaving is
fixed for annex A QAM modulation.
• TUNER A •
SELECT OUT
INTERLEAVING
(128,3)
The possible options are:
(128,1), (128,2), (64,2), (128,3), (32,4), (128,4), (16,8),
(8,16).
Output baud rate selection
This menu allows the user to set the output QAM
baud rate and is only available when the output
QAM format selected is annex A, as the baud rates
are fixed in annex B QAM modulation.
• TUNER A •
SELECT OUT
BAUD RATE
5.156 Kbaud
The valid output baud rates are in the range 1000
to 7.200 Kbaud.
Output level selection
This menu lets you select the QAM channel output
level, between 00 and 99. A setting of "99" means
no attenuation is applied to the output and thus
the output level is the maximum (43 ± 2dBmV). A
setting of "00" means the output level is attenuated
by 20 dB (approx.) below its maximum output
level. By changing this value the user can select
the amount of attenuation applied and therefore
balance the system as needed.
- TUNER A -
SELECT OUT
LEVEL
69
Output mode selection
Use this menu to select the desired output mode:
- TUNER A -
SELECT OUT
MODE
NORMAL
- NORMAL: The output signal
transmodulated signal. This is the normal
functioning mode.
- NULL: Null packets are modulated. This mode
generates a well-formed QAM output carrier even
when the demodulator is not locked and can be
used to balance the system in absence of input
signal (off-site).
- MUTED: There is no output signal. This mode can
be used to turn off the output of certain channels
or to leave hot spares prepared in the headend.
- CARRIER WAVE: The unit
unmodulated carrier wave on the output
frequency that has the same level as the power of
the corresponding QAM carrier. This mode can be
used to balance the RF output levels with a simple
SLM when a QAM digital meter is not available.
20
is a QAM
generates an