Atec Rohde-Schwarz_FSL Series - Manual (Page 19)

Version 09.00, December 2008 R&S ® FSL Spectrum Analyzer 19
Digital TV
QAM demodulator user-configurable, block-based, open-loop software demodulator
J.83/A (DVB-C Europe)
J.83/B (US cable)
Standards
J.83/C (Japanese cable)
Measurements
Spectrum active
channel/signal spectrum
result table, zoom of individual parameters possible
modulation error rate (peak and RMS value)
error vector magnitude (peak and RMS value)
frequency offset Overview
symbol rate offset
Constellation color constellation diagram with zoom capability
result table, zoom of individual parameters possible
amplitude imbalance
quadrature error
carrier suppression
phase jitter
modulation error rate (peak and RMS value)
Modulation errors
error vector magnitude (peak and RMS value)
Channel analysis –20 × symbol duration to
+100 × symbol duration magnitude of channel impulse response,
zoom
Channel power measurement of channel power
APD amplitude probability distribution, special channel filters
(5 MHz, 6 MHz, 7 MHz, 8 MHz, 10 MHz)
CCDF complementary cumulative distribution function, special channel filters
(5 MHz, 6 MHz, 7 MHz, 8 MHz, 10 MHz)
Digital TV measurement ranges and measurement uncertainty
Demodulator
Adjustable symbol rate
0.1 Hz steps 0.1 MHz to 7.15 MHz
Permissible symbol rate error referenced to symbol rate typ. ±0.1 %
Permissible frequency error typ. ±30 kHz
Modulation formats QAM 4/16/32/64/128/256/512/1024
Equalizer ON/OFF/freeze/reset; fractionally spaced; taps from –5 symbols to +25 symbols
Receive filter root raised cosine roll-off factor = 0.12/0.13/0.15/0.18
Measurements
Overview
64QAM, roll-off factor = 0.15,
symbol rate = 6.9 MHz, equalizer OFF,
R&S
® FSL-B4 OCXO option
typ. residual MER RMS greater (95 %)
than
at 200 MHz, 400 MHz, 600 MHz, 800 MHz 42.0 dB, 39.2 dB, 38.6 dB, 41.6 dB
256QAM, roll-off factor = 0.12,
symbol rate = 5.3605369 MHz, equalizer
OFF, R&S
® FSL-B4 OCXO option
typ. residual MER RMS greater (95 %)
than
MER
at 200 MHz, 400 MHz, 600 MHz, 800 MHz 42.3 dB, 40.8 dB, 39.3 dB, 41.9 dB
TV analyzer
Standards see “Analog TV” and “Digital TV”
Measurements
Tilt
Display of the power of many channels versus frequency allows
level differences/tilt to be detected. Channels are selected by
specifying the frequency range and/or modulation characteristics.