MP7505 Series User Manual
(3) Set carrier wave parameters:
Press the wave shap key of the selected carrier wave to display the waveform
and parameters of the carrier wave. You can change the parameters of the
carrier wave. Press Mod to return to the modulation mode interface.
(4) Select modulating wave source:
BPSK uses internal modulation source. Press the DataSource softkey to select
PN15, PN21, 01 Patt, or 10 Patt as the modulating wave source.
(5) Set BPSK rate:
Press the Bit rate softkey to set the BPSK rate. The rate at which the output
phase shifts between the carrier phase and the modulating phase is determined
by BPSK rate (for internal source). The range is 2 mHz – 1 MHz.
(6) Set BPSK phase deviation:
Press the Deviation softkey to set the modulating phase deviation.
QPSK (Quadrature Phase Shift Keying)
Quadrature Phase Shift Keying modulation is a modulation technique that shifts the
output signal phase among four preset phases: the carrier phase and three
modulating phases. The shift frequency (QPSK rate) is determined by the internal
signal level of the instrument. The QPSK user interface is shown below.
Modulating wave
Carrier wave
Parameter 1
Parameter 2
Parameter 3
Load
Mod
Type
Source
Parameter 4
Figure 5-22: QPSK user interface
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