MP7505 Series User Manual
How to set the parameters of PSK
(1) Press the Mod function key, then press the Type softkey, turn the rotary control
to select PSK, 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) Select modulating wave source:
Press the Source softkey to select Internal or External as the modulating wave
source.
(5) If you select Internal, the modulating wave is set as a Square with 50% duty
cycle. Press the PSK Rate softkey to set the PSK rate. The rate at which the
output phase shifts between the carrier phase and the modulating phase is
determined by PSK rate (for internal source only). The range is 2 mHz – 1 MHz.
If you select External, use the Mod/FSK/Trig connector at the rear panel to
input the external modulating signal. Press the Slope softkey to switch between
Positive and Negative polarity of the modulating wave to control the output
phase. Set the slope to Positive, the generator would output the carrier phase
when the external input signal is logic low level, and output the modulating
phase when the external input signal is logic high level. The situation is the
opposite when the slope is set to Negative.
(6) Set PSK phase deviation:
Press the Deviation softkey to set the modulating phase deviation.
3FSK (3 Frequency Shift Keying)
3 Frequency Shift Keying modulation is a modulation technique that shifts the
output signal frequency among three preset frequencies: the carrier frequency and
two hop frequencies. The shift frequency (3FSK rate) is determined by the internal
signal level of the instrument. The 3FSK user interface is shown below.
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