JUNCTEK JDS8080 - Phase Shift Keying (PSK); PSK Setup and Parameter Configuration

JUNCTEK
JDS8000 Series User’s Manual
25
 Internal
Select the internal modulation source, that is, select a square waveform
with a duty cycle of 50% as the modulation waveform. At this point, the
frequency at which the output amplitude shifts between the carrier
amplitude and the modulation amplitude is determined by the modulation
rate.
 External
When the external modulation source is selected, the signal generator
accepts the external modulation signal input from the MOD port on the
front panel.
The frequency range of the external signal is 20Hz~20kHz, and the
amplitude range is -5V~+5V.
 Set modulation rate and carrier frequency
Press the soft key
【
Rate
】
, when the frequency is enabled, you can set the
rate of the modulating waveform, press the soft key
【
Carr.F
】
again, the
carrier frequency is on, you can set the carrier frequency. (The modulation rate
is only available after using the "internal" modulation source)
Use the
【
InBox
】
button to input the desired frequency value in the input box.
The frequency range is 0.001Hz to 1MHz, the default is 500Hz.
 Set hopping frequency
Press
【
Hop.F
】
soft key to set the hopping frequency.
Use the
【
InBox
】
button to input the desired frequency value in the input box.
(6) PSK
Phase Shift Keying (PSK): A modulation technique in which the phase of the
carrier is used to represent the information of the input signal. Definition of
Phase Shift Keying: Time Discrete Each characteristic state of the modulated
signal is modulated by an angle represented by a specific difference between
the phase of the modulated signal and the phase of the carrier before
modulation.
 Choose the carrier waveform
Refer to "Selecting carrier waveform" in "Amplitude modulation".
DC in pulse wave, noise wave and arbitrary wave cannot be used as carriers.
 Select PSK
Press
【
MOD
】
→press
【
Type
】
→select key phase by adjusting knob or
pressing direction keys.
 Set the polarity
Press the soft key
【
Polar
】
to select the amplitude output controlled by the
“positive polarity” or “negative polarity” of the modulating wave.