Promax MO-160 Manual Del Usuario página 47

USER'S MANUAL. MO-160
The modulator can be configured to generate any of the transmission modes
listed in the DVB-T specification. In hierarchical modes, the HP and LP streams can be
encoded with different convolution code rates. The channel bandwidth can be set by the
user to 6, 7 or 8 MHz as required by the application. Several test modes are available in
the MO-160 (blanking of carriers, single tone output, test TS generation, CBER and
VBER injection).
The modulator is frequency agile. The user can select an RF output frequency
between 470 and 875 MHz in steps of 1 Hz. In normal operation, the IF output
frequency is internally set by the modulator and varies between 32 and 36 MHz
depending on the selected RF frequency. The RF output can be switched off, in which
case the IF frequency is fixed at 36 MHz. The polarity of the IF/RF spectrum (inverted or
non-inverted) can be selected by the user.
The MO-160 has been designed to work in Multi Frequency Networks (MFN).
Single Frequency Network (SFN) operation is not currently supported. The quality of the
output signal has been optimised for 8 MHz channels. The MER measured at IF in this
case is approximately 40 dB in master mode.
The operation of the MO-160 is done via the front panel LCD display and controls.
The modulator can be easily configured by navigating through a rather intuitive set of
menus. A couple of LEDs located on the front panel signal the existence of errors in the
modulator or whether the equipment is properly powered.
02/2008 Page 3