Atec Rohde-Schwarz-SFQ Series - Manual (Page 16)

16 TV Test Transmitter R&S ® SFQ
Symbol rate 5.0569 Msps for 64QAM,
5.360 Msps for 256QAM
Range ±10%
Bandwidth 6 MHz
Pulse filtering (root cosine) 0.18 (64QAM), 0.12 (256QAM) roll-off
Data interleaver level 1 and level 2; can be switched off
Special functions switchable: randomizer, Reed-Solomon
coder
Error simulation selectable: carrier suppression, I/Q im-
balance, I/Q phase error
DVB-S/-DSNG Coder option R&S SFQ-B23 (-B24)
Not in conjunction with option R&S SFQ-B6 model .02, R&S SFQ-B6 model .03
recommended
Characteristics
meet EN 300 421/EN 301 210
Type of modulation QPSK, 8PSK, 16QAM
Code rate QPSK: 1 /
2
, 2 /
3
, 3 /
4
, 5 /
6
, 7 /
8
8PSK: 2 /
3
, 5 /
6
, 8 /
9
16QAM: 3 /
4
, 7 /
8
Symbol rates 0.1 Msps to 80 Msps (selectable)
Pulse filtering root cosine roll-off,
alpha=0.35
variable roll-off (0.25 to 0.45)
Energy dispersal can be switched off
Reed-Solomon coder (204,188, t =8) can be switched off
Convolutional interleaver can be switched off
Convolutional encoder can be switched off
Mode
DATA MPEG2 input signal (without input sig-
nal automatic switchover to PRBS with
TS PARALLEL, stuffing with ASI, SPI)
NULL TS PACKET null packets (PID=1FFF, payload=0)
NULL PRBS PACKET null packets (PID=1FFF, payload=
PRBS, 2 15 -1/2 23 -1 to ITU-T Rec. O.151)
PRBS before convolutional encoder 2 15 -1/2 23 -1 to ITU-T Rec. O.151
Turbocoding option R&S SFQ-B25
Code rate QPSK turbo: 2 /
3
, 3 /
4
8PSK turbo: 1 /
2
, 2 /
3
, 3 /
4
, 8 /
9
I/Q Output/Input option R&S SFQ-B14
Output
Output impedance 50
Ω
Output voltage depending on selected modulation
Connector BNC female
Input
Input impedance 50
Ω
VSWR (DC to 30 MHz) <1.4
Input voltage for full-scale level (I 2 + Q 2 ) 1/2 = 0.5 V (1 V EMF, 50
Ω)
Connector BNC female
Specifications of transmission simulation
Fading Simulator option R&S SFQ-B11
Model .02 paths 1 to 6 (R&S SFQ delivered before
1999: see R&S SFQ-B18)
Model .04 paths 7 to 12 (only in conjunction with
R&S SFQ-B11, model .02)
Reduced maximum RF output level
−5.5 dBm for DVB-T
(single-path fading without loss)
RF output power MULTIPATH: the RF level displayed is
the sum of the power levels in the indi-
vidual paths
MAIN: the RF level displayed is the
power of the main path
C/N ratio maintained if fading parameters are
changed;
MULTIPATH : C=total power of all paths
MAIN: C=power of main path
RF bandwidth (
−3 dB)
>14 MHz
Frequency response up to 5 MHz offset
from carrier frequency
<0.6 dB, typ. <0.3 dB
Carrier leakage typ. 42 dBc
Number of paths with R&S SFQ-B11
Model .02 6
Model .02 plus model .04 12
Path loss
Range 0 dB to 50 dB
Resolution 0.1 dB
Inaccuracy (from 0 dB to 20 dB) <0.3 dB
Path delay
Range 0 ms to 1600 ms
Resolution 50 ns
Inaccuracy <5 ns
Constant phase
Range 0 o to +359.9 o
Resolution 0.1 o
Pure Doppler
Frequency range 0.1 Hz to 1600 Hz
Speed range v
min
=(0.03·10 9 m/s 2 )/f
RF
v
max
=(479·10 9 m/s 2 )/f
RF
for f
RF
=1 GHz v
min
=0.1 km/h, v
max
=1724 km/h
Resolution 0.1 km/h, m/s, mph
Inaccuracy <0.13%
Rayleigh fading
Pseudo noise interval >372 h
Deviation from theoretical CPDF 1 ) at
P
avg
=0 dB
From
−20 dB to +10 dB
<1 dB, typ. <0.3 dB
From
−30 dB to −20 dB
<2 dB, typ. <0.3 dB
Rice fading
Power ratio 2 )
Range −30 dB to +30 dB
Resolution 0.1 dB
Frequency ratio
Range −1 to +1
Resolution 0.05
Lognormal fading, Suzuki fading
Standard deviation
Range 0 dB to 12 dB
Resolution 1 dB
Local constant I
min
: up to 200 m
(I
min
=(12·10 9 m/s 2 )/f
RF
)
Fading profile selectable from a list of predefined pro-
files; each profile can be modified as re-
quired
Reference on frequency change speed or Doppler frequency can be se-
lected
Noise Generator option R&S SFQ-B5
Not in conjunction with R&S SFQ-B2 (is already included)
Bandwidth
Receiver bandwidth 0.1 MHz to 80 MHz (selectable)
Actual noise bandwidth 10 MHz/60 MHz
C/N setting
Variation range 50 dB
Minimum selectable C/N depending on bandwidth and modula-
tion (see diagram)
Resolution 0.1 dB
C/N error
Absolute error <0.3 dB (after calibration), typ. <0.2 dB
RF frequency range
With noise bandwidth
≤10 MHz ≥15 MHz
With noise bandwidth >10 MHz
≥60 MHz