Tektronix MTS4000 MPEG, Technical Reference

Page: 19 / 41

Speci fi cations
Table 6: 8VSB measurements
Measurements Description
RF Lock
RF lock is indicated by LED and Status
Input level (signal strength), typical Display Range: –72 dBm to –2 dBm relative to 75
Ω (–23 dBmV to +47 dBmV)
Resolution: 1 dB
Accuracy: ±3 dB
EVM (Error Vector Magnitude), typical Display Range: ≤ 3.0% to ≥ 12.5% rms
Resolution: 0.1%
Accuracy: ±20% of reading
Equivalent MER (Modulation Error
Ratio) with Equalizer, typical Display Range: 17 dB to 31 dB with Equalizer
Resolution: 0.1 dB
Accuracy: ±1 dB for MER >25 dB; ±3 dB for MER 25 dB to 31 dB
(Measured at –30 dBm input. For best MER accuracy, maintain the input signal level
between –50 dBm and –15 dBm.)
SNR (Signal to Noise Ratio), typical Display Range: 15 dB to 35 dB
Resolution: 1 dB
Accuracy: ±1 dB for SNR < 25 dB; ±3 dB for SNR 25 dB to 35 dB
BER Pre-RS BER, SER 1 second and 10 seconds windows values are displayed
TEF (Transport Error Flag) Transport Error Flags (uncorrectable error count) in a 1 second window and 10 second
window are displayed
Constellation diagram The 8VSB constellation diagram is a display of I-data history with histograms (the IQ
constellation is not available). This is displayed as Symbol Distribution in the user interface
Echo pro fi le, typical Equalizer fi lter tap information is displayed.
Display Echo Level range: Normalized real tap values over the range of –1 to 1
Display Delay range: –6.7
μ s to 45.5 μ s
Table 7: QAM Annex B card characteristics
Characteristic Description
Input frequency range 88 MHz to 858 MHz
Input signal level, typical –64 dBm to –19 dBm (45 dBuV to 90 dBuV relative to 75 Ω )
With either a 64 or 256 QAM input, there are fi ve or fewer Transport Error Flags in
11 seconds, which corresponds to a post FEC rate of 1e
–8
≥ –30 dBm when operated in an electromagnetic fi eld of 3 V/m or more
Modulation format 64QAM, 256QAM (compliant with ITU J-83 Annex B)
Interleaving mode Level 1 and Level 2 interleaving support compliant with all ITU J-83 Annex B, excluding I,
J = (128,7) and (128,8), and in 256 QAM excluding (8, 16) and (16, 8)
Modulation baud rate
64 QAM: 5.056941 Mbaud/s
256 QAM: 5.360537 Mbaud/s
Spectrum polarity Demodulates both Normal and Inverted IF Spectrum
Receiver bandwidth, QAM B 6 MHz nominal
Connector type F type
MTS4000 Speci fi cations and Performance Veri fi cation 5