Modulation
⚫
The phase range is from 0º to 360º and the default is 180º .
8.9
QPSK Modulation
Users can configure the instrument to "shift" its output phase between four preset
values using QPSK modulation. The rate at which the output shifts between the four
phases (called the "carrier phase" and three "modulation phases") is determined by the
internal signal level of the instrument.
8.9.1
Select QPSK Modulation
Press [Mod] >
⚫
When
Mod
⚫
After QPSK is enabled, the instrument will generate QPSK waveform with the
currently specified carrier and modulating waveforms. To avoid multiple waveform
changes, enable modulation after configuring the other modulation parameters.
8.9.2
Carrier Waveform Shape
QPSK carrier shape: Sine (default), Square, Ramp, Pulse, Arbitrary (except DC) or
Harmonic waveform.
⚫
Press [Wave] button on the front panel to select the desired carrier waveform.
⚫
Noise and DC could not be used as carrier waveform.
8.9.3
Carrier Waveform Phase
Press [Setting] >
direction keys and knob to input the desired phase.
The available phase ranges from 0º to 360º and the default value is 0º .
8.9.4
Modulation Source
QPSK uses the internal modulation source. After enabling QPSK modulation function,
press [Mod] >
modulation source. The default is PN15 code.
8.9.5
QPSK Rate
When internal modulation source is selected, press [Mod] >
at which the output phase shifts between "carrier phase" and three "modulation
HDG3000B User manual
50
Type
>
QPSK
softkey to enable QPSK function.
is enabled,
Sweep
or
Burst
Phase
softkey on the front panel and use the numeric keypad or
Data Source
softkey, and select PN15 and PN21 codes as the
will be disabled automatically.
Rate
softkey to set the rate
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