User Manual 49
5.9.5 QPSK Rate
QPSK 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.
5.9.6 Modulating Phase
Press
Phase1
or
Phase2/Phase3
to set the parameter.
Use the numeric keyboard or direction keys and knob to input the desired amplitude value.
The phase range is from 0º to 360º and the default is 180º.
5.10 3FSK Modulation
You can configure the instrument to "shift" its output frequency between three preset values using
3FSK modulation. The rate at which the output shifts between the three frequencies (called the
"carrier frequency" and two "hop frequencies") is determined by the internal signal level of the
instrument or the signal level on the front-panel
[Sync/Mod/Trig]
connector.
5.10.1 Select 3FSK Modulation
Press
Mod->Type->3FSK
to enable this function.
When
Mod
is enabled,
Sweep
or
Burst
will be disabled automatically.
After 3FSK is enabled, the instrument will generate 3FSK waveform with the currently specified
carrier and modulating waveforms. To avoid multiple waveform changes, enable modulation
after configuring the other modulation parameters.
5.10.2 Carrier Waveform Shape
3FSK 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.
5.10.3 Carrier Frequency
Choose carrier waveform shape, press
Frequency/Period
to highlight "Frequency", and then use
the numeric keyboard or direction keys and knob to input the desired frequency.
