MP7505 Series User Manual
How to set the parameters of QPSK
(1) Press the Mod function key, then press the Type softkey, turn the rotary control
to select QPSK, press the OK softkey.
(2) Select carrier wave shape:
The carrier wave can be Sine, Square, Ramp, or Arbitrary wave (except DC).
Press , , , or to select a desired carrier wave shap.
(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) Set QPSK rate:
Press the Rate softkey to set the QPSK rate. The rate at which the output phase
shifts between the carrier phase and the modulating phase is determined by
QPSK rate (for internal source). The range is 2 mHz – 1 MHz.
(5) Set the modulating phases:
Press the Phase1, Phase2 and Phase3 softkey to set the modulating phases
respectively. The range is 0° to 360°.
OSK (Oscillation Shift Keying)
Oscillation Shift Keying modulation is a modulation technique that the generator to
output a sine signal with intermittent oscillation. The start-oscillation and
stop-oscillation of the internal crystal oscillator are controlled by the internal signal
level of the instrument. When the internal crystal oscillator starts to oscillate, the
instrument starts to output the carrier waveform and when the internal crystal stops
oscillating, the output stops. The OSK user interface is shown below.
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