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Parameter Entry and Measurement Setup Dialog Archive Front Panel Menus
4-46 MS278XB OM
VSA Modulation Parameters Setup Dialog
The VSA Modulation Parameters dialog allows you to specify the modulation setting for your measurement.
Modulation Tab
Modulation Settings:
Format:
BPSK: Binary Phase Shift Keying
QPSK: Quadrature Phase Shift Keying (default)
Pi4QPSK: Pi/4 Quadrature Phase Shift Keying
8PSK: Octet Phase Shift Keying
3Pi8PSK: 3Pi/8 Phase Shift Keying
16QAM: 16 Value Quadrature Amplitude Modulation
32QAM: 32 Value Quadrature Amplitude Modulation
64QAM: 64 Value Quadrature Amplitude Modulation
128QAM: 128 Value Quadrature Amplitude Modulation
256QAM: 256 Value Quadrature Amplitude Modulation
Symbol Rate: Sets the symbol rate for the
measurement.
Range: 10 kHz to 20 MHz
Default: 3.84 MHz.
Capture Time: Sets the length of the time during which
samples are captured.
Range: 1s to 5 µs*
Terminators: us, ms, s, ks, Cancel
* Constrained by the following:
10,000
≥ (Symbol Rate x Capture Time ≥ 100
Filtering:
Filter Type: Selects from the following receiver filters:
Low Pass
Nyquist
Root Nyquist (default)
Rolloff Factor: Sets the roll-off factor for the
measurement.
Range: 0.1 to 1.0 in steps of 0.01
Default: 0.22.
Figure 4-19. VSA Modulation Parameters Dialog