User Manual 51
When Mod is enabled, Sweep or Burst will be disabled automatically.
After 4FSK is enabled, the instrument will generate 4FSK waveform with the currently specified
carrier and modulating waveforms. To avoid multiple waveform changes, enable modulation
after configuring the other modulation parameters.
5.11.2 Carrier Waveform Shape
4FSK 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.
5.11.3 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.
Different carrier waveforms have different frequency ranges as shown in the table below. For all
the carrier waveforms, the default value is 1KHz.
5.11.4 Modulating Waveform Source
4FSK uses internal modulation source. The modulation waveform is square.
5.11.5 4FSK Rate
4FSK uses internal modulation source.The 4FSK Rate is the rate at which the output frequency
shifts between "carrier frequency" and three "modulating frequencies". Press Rate to set.
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.
5.11.6 Hopping Frequency
Alternating frequency (hopping frequency) is the modulating frequency. The range of hop
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