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5.8 BPSK Modulation
Users can configure the instrument to "shift" its output phase between two preset values using
BPSK modulation. The rate at which the output shifts between the two phases (called the "carrier
phase" and the "modulation phase") is determined by the internal signal level of the instrument.
5.8.1 Select BPSK Modulation
Press [Mod] >Type > BPSKsoftkey to enable the BPSK function.
When Mod is enabled, Sweep or Burst will be disabled automatically.
After BPSK is enabled, the instrument will generate BPSK waveform with the currently specified
carrier and modulating waveforms. To avoid multiple waveform changes, enable modulation
after configuring the other modulation parameters.
5.8.2 Carrier Waveform Shape
BPSK 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.
5.8.3 Carrier Waveform Phase
Press[Setting] >Phasesoftkey on the front panel and use the numeric keypad or direction keys
and knob to input the desired phase.
The available phase ranges from 0º to 360º and the default value is 0º.
5.8.4 Modulation Source
BPSK uses internal modulation source. After enabling BPSK modulation function, press
[Mod] >Data Source softkey, and select 01 code, 10 code, PN15 code or PN21 code as the
modulation source. The default data source is 01 code.
5.8.5 BPSK Rate
When internal modulation source is selected, press [Mod] > Rate softkey to set the rate at which
the output phase shifts between "carrier phase" and "modulation phase".
Use the numeric keypad or direction keys and knob to input the desired rate value.
The rate range is from 2mHz to 1MHz and the default is 100Hz.
User Manual 46
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