Promax MO-170 Manual De Instrucciones página 53

USER'S MANUAL. MO-170
RF OUTPUT
Type
Frequency range
Spectrum polarity
Power level (average)
Frequency stability
MER
SSB phase noise
DVB-T PARAMETERS
IFFT size
Guard intervals
Code rates
Constellations
Hierarchical modes
MFN operation
Channel bandwidth
TEST MODES
Carrier blanking
Pilot carriers
Single carrier
TS packet generation
PRBS generation
Bit error injection
12/2006
50 Ω N-type female connector
Adjustable between 45 and 875 MHz in 1 Hz
steps
Selectable via front panel controls
Approximately 80 dBµV with no attenuation.
Variable attenuation of 0 to 60 dB in steps of 1
dB
20 ppm
> 32 dB
≤ -87 dBc/Hz @ 2 kHz
2k, 8k
1/4, 1/8, 1/16, 1/32
1/2, 2/3, 3/4, 5/6, 7/8
QPSK, 16QAM, 64QAM
16QAM and 64QAM constellations with
constellation ratio α= 1, 2 or 4
Available
6, 7 and 8 MHz (user selectable)
Blank a number of carriers (start index to stop
index) within the COFDM ensemble. This
allows to measure in-band intermodulation and
quantisation noise
Generate the pilot carriers only (continual and
TPS)
Generate a single carrier at the channel central
frequency whose level equals the average
COFDM output power or is set to the maximum
available. This is intended for signal level
alignment
Internal generation of test TS using PRBS
sequences of length 15 or 23 embedded within
NULL packets as specified in document ETSI
TR 101 290
Map a PRBS sequence into constellation
points following the guidelines of document
ETSI TR 101 290
Inject bit errors at the input to the constellation
mapper (results in a non-zero CBER before the
Viterbi decoder) or at the input to the
convolutional encoder (results in a non-zero
VBER after the Viterbi decoder).
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