Specifications - Promax MO-180 Manual De Usuario

In MFN operation, the MO-180 is capable of filtering out up to 16 Program
Elementary Streams (PES) identified by their PIDs. The MPEG-2 TS is not actually re-
multiplexed because the TS tables are not updated, only the PES's are eliminated to
help reduce the bit rate. This feature finds its application in, for example, trans-
modulating a high-bit-rate DVB-S or DVB-C signal to DVB-T/H.
DVB-H specific options are native or in-depth interleaving for 2k and 4k carriers,
and signalling of the use of time slicing and/or MPE-FEC in any of the modulated
transport streams via the TPS bits transmitted in the COFDM signal. Although also
optional in DVB-T, the cell ID is a mandatory parameter that needs to be defined for
any DVB-H signal.
The modulator is frequency agile. The user can select an RF output frequency
between 45 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 spectrum of the COFDM signal is spectrally
shaped using a raised cosine window in order to reduce the amount of out-of-band
spurious components. There is a trade-off between the size of the window and the
reduction in adjacent channel interference. The choice of window size has been
optimised for each combination of FFT and guard interval lengths.
The MO-180 has been designed to work in both Multi Frequency Networks
(MFN) and Single Frequency Networks (SFN). The MER measured at IF is typically
above 43 dB regardless of the channel bandwidth. In RF the typical MER that can be
measured with a high-end DVB-T/H receiver lies above 38 dB.
The operation of the MO-180 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.

1.3 Specifications

INPUTS
MPEG-2 Transport Stream
GPS Inputs
10 MHz input
Page 4
Two DVB-ASI inputs, 75 Ω female BNC.
One DVB-SPI input, LVDS DB-25.
TS packets of length 188 or 204 bytes
(automatic detection).
Support for burst and continuous packet mode.
High impedance / 50 Ω female BNC.
Min. 50 mV, max. +3.3V.
USER'S MANUAL MO-180
04/2008