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Interface Configuration and Interpretation
3-130 MTM400 MPEG Transport Stream Monitor User Manual
Configurations: This dialog box provides an option to recall a number of settings
configuration files; for example, prestored transponder
parameters. The configuration files are created and stored in the
MTM400. To select a configuration file, highlight the required
name in the list.
Tuner Frequency (kHz):
This value is the center frequency of the IF channel to be
received (that is, after downconversion in the LNB where
applicable). Any frequency can be entered; there is no need to
follow a channel plan. The frequency resolution is determined
by the tuner step size of 1 MHz.
Symbol Rate (kBaud):
This value is the symbol frequency (Baud rate) of the signal to
be received, over a range of 1 to 30 MBaud. You need to enter
the symbol rate to a typical accuracy of 1000 ppm to ensure
successful lock.
Modulation Format:
The card supports a number of modulation formats: Turbo FEC
8PSK, Turbo FEC QPSK, DVB QPSK and Digicipher ™ II.
Enter the appropriate format and puncture rate (also known as
the code rate) into the modulation dropdown dialog box. A Scan
function is also provided, allowing automatic acquisition if the
precise code rate is not known.
LNB Power: The QPSK/8PSK card incorporates a regulated power supply for
control of a LNB (Low Noise Block) or similar equipment. The
supply voltage, using the drop-down dialog box, is selectable
between Off (default), 13V and 18V. The output current is
limited to 200 mA maximum, and is foldback limited to a low
value in the event of an overload.
LNB 22kHz Tone:
A 22 kHz tone is provided for control of an LNB (Low Noise
Block) or similar equipment. The tone, using the drop-down
dialog box, is selectable between Off (default) or On.
Front End Lock
If full lock is acquired onto the channel and it is receiving the
signal correctly, the Front End Lock (FEL) indicator will light
up green. When a signal is present but no lock is achieved, the
indicator is red. When no signal is found, the indicator is gray.
BER The Bit Error Rate ahead of the FEC is displayed.