User Manual 48
5.8 BPSK
You 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->BPSK to enable this 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 the front panel key Sine, Square, Ramp, Pulse, Arb -> Type or Harmonic to select a
desired carrier waveform shape.
Noise and DC could not be used as carrier waveform.
5.8.3 Carrier Phase
Choose carrier waveform shape, press Phase to highlight "Phase", and then use the numeric
keyboard 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 Modulating Waveform Source
BPSK uses internal modulation source. Press 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
BPSK uses internal modulation source. Press Rate to set the frequency at which the output phase
shifts between "carrier phase" and "modulating phase".
Use the numeric keyboard or direction keys and knob to input the desired frequency value.
The frequency range is from 2mHz to 1MHz and the default is 100Hz.
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