Promax MO-180 Manual De Usuario página 76

RF OUTPUT
Type
Frequency range
Spectrum polarity
Power level (average)
Level of harmonics and
spurious
Frequency stability
MER
Phase noise
Muting in the presence of errors SFN only.
DVB-T/H PARAMETERS
Number of carriers
Guard intervals
Code rates (HP&LP)
Symbol interleaver
Constellations
Hierarchical modes
Network topology
TPS signalling
Channel bandwidth
Parameter extraction
PROCESSING DELAYS
MFN
SFN
TEST MODES
Carrier blanking
Pilot carriers
Page 6
50 Ω N-type female connector.
Adjustable between 45 and 875 MHz in 1 Hz
steps.
Selectable via front panel controls.
Approximately -27 dBm on 50 Ω with no
attenuation. Variable attenuation of 0 to 60 dB in
steps of 1 Db.
< —50 dBc.
Better than 5 ppm.
> 38 dB typical.
Better than —94 dBc/Hz @ 1 kHz.
2k, 4k, 8k.
1/4, 1/8, 1/16, 1/32.
1/2, 2/3, 3/4, 5/6, 7/8.
Native and in-depth (2k & 4k DVB-H only).
QPSK, 16QAM, 64QAM.
16QAM and 64QAM
constellation ratio α = 1, 2 or 4.
MFN and SFN.
Cell ID, DVB-H's time-slicing and MPE-FEC.
5, 6, 7 and 8 MHz.
MIP packet or local programming
The static delay may be adjusted between 0 and
1 second with a resolution given by the DVB-T/H
elementary clock period.
Dynamic delay automatically calculated from the
10 MHz GPS reference, the 1pps signal and the
MIP packet embedded in the HP TS multiplex.
The resolution is 100 ns.
A positive or negative local delay offset may be
added as long as the total delay is never greater
than 1 s or lower than the inherent latency of the
modulator
Synchronisation accuracy better than ±200 ns.
Rough estimate of the network delay from the
SFN adapter output to the modulator TS inputs
Blank a number of carriers (start index to stop
index) within the COFDM ensemble.
Generate the pilot carriers only (continual and
TPS).
USER'S MANUAL MO-180
constellations
04/2008
with