R&S®EFA70/73 Test Receiver (ITU-T)
All measurement functions for ITU-T J.83/B (US Cable) digital CATV standard
Features
- Overview
- Fig. 13: Measurement menu
- Fig. 14: Constellation diagram
- Fig. 15: QAM modulation parameters
- Fig. 16: Spectrum analysis
- Fig. 17: Amplitude and phase frequency response
- Fig. 18: Echo pattern
- Fig. 19: Histogram I
- Fig. 20: Histogram Q
- Fig. 21: Amplitude distribution
- Fig. 22: Complementary cumulative distribution function (CCDF)
- Fig. 23: Complementary cumulative distribution function (CCDF)
- Fig. 24: Monitoring/Alarm register
Overview
The new test receiver, even the basic version, features a wide range of innovative measurement functions, allowing comprehensive, in-depth signal analysis. In addition to measuring general parameters (Fig. 13) such as bit error ratio (BER), more thorough analysis includes:
- I/Q constellation diagrams (Fig. 14) with user-selectable number of symbols to be displayed, range: 1 to 999 999 999 symbols
- I/Q parameters, modulation error ratio (MER), error vector magnitude (EVM), phase jitter and signal-to-noise ratio (Fig. 15)
- Frequency spectrum (Fig. 16)
- Complex channel transmission function (Fig. 17)
- Received echo signals: echo pattern (Fig. 18)
- Histogram I (Fig. 19) and Q (Fig. 20) with user-selectable number of symbols to be displayed, range: 1 to 999 999 999 symbols
- Linearity analysis from amplitude distribution histogram and CCDF referred to the RF signal (Fig. 21 and Fig. 22)
- History function: long-term monitoring of transmission parameters (Fig. 23)
- Alarm monitoring window (Fig. 24)
Any failures and degradations are immediately visible from the constellation diagram. Effects of interest can be located more precisely by varying the number of symbols represented. The integrated spectral analysis function enables simple examination of the signal type and its spectrum.
